From c8013d4982c46e09b09a083b72baee2f5c0d77b0 Mon Sep 17 00:00:00 2001 From: Christopher Speller Date: Wed, 1 Aug 2018 15:38:56 -0700 Subject: Remove accidential dependency (#9203) --- vendor/github.com/alecthomas/template/LICENSE | 27 - vendor/github.com/alecthomas/template/README.md | 25 - vendor/github.com/alecthomas/template/doc.go | 406 ---------- vendor/github.com/alecthomas/template/exec.go | 845 --------------------- vendor/github.com/alecthomas/template/funcs.go | 598 --------------- vendor/github.com/alecthomas/template/helper.go | 108 --- vendor/github.com/alecthomas/template/parse/lex.go | 556 -------------- .../github.com/alecthomas/template/parse/node.go | 834 -------------------- .../github.com/alecthomas/template/parse/parse.go | 700 ----------------- vendor/github.com/alecthomas/template/template.go | 218 ------ 10 files changed, 4317 deletions(-) delete mode 100644 vendor/github.com/alecthomas/template/LICENSE delete mode 100644 vendor/github.com/alecthomas/template/README.md delete mode 100644 vendor/github.com/alecthomas/template/doc.go delete mode 100644 vendor/github.com/alecthomas/template/exec.go delete mode 100644 vendor/github.com/alecthomas/template/funcs.go delete mode 100644 vendor/github.com/alecthomas/template/helper.go delete mode 100644 vendor/github.com/alecthomas/template/parse/lex.go delete mode 100644 vendor/github.com/alecthomas/template/parse/node.go delete mode 100644 vendor/github.com/alecthomas/template/parse/parse.go delete mode 100644 vendor/github.com/alecthomas/template/template.go (limited to 'vendor') diff --git a/vendor/github.com/alecthomas/template/LICENSE b/vendor/github.com/alecthomas/template/LICENSE deleted file mode 100644 index 744875676..000000000 --- a/vendor/github.com/alecthomas/template/LICENSE +++ /dev/null @@ -1,27 +0,0 @@ -Copyright (c) 2012 The Go Authors. All rights reserved. - -Redistribution and use in source and binary forms, with or without -modification, are permitted provided that the following conditions are -met: - - * Redistributions of source code must retain the above copyright -notice, this list of conditions and the following disclaimer. - * Redistributions in binary form must reproduce the above -copyright notice, this list of conditions and the following disclaimer -in the documentation and/or other materials provided with the -distribution. - * Neither the name of Google Inc. nor the names of its -contributors may be used to endorse or promote products derived from -this software without specific prior written permission. - -THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS -"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT -LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR -A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT -OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, -SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT -LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, -DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY -THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT -(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE -OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. diff --git a/vendor/github.com/alecthomas/template/README.md b/vendor/github.com/alecthomas/template/README.md deleted file mode 100644 index ef6a8ee30..000000000 --- a/vendor/github.com/alecthomas/template/README.md +++ /dev/null @@ -1,25 +0,0 @@ -# Go's `text/template` package with newline elision - -This is a fork of Go 1.4's [text/template](http://golang.org/pkg/text/template/) package with one addition: a backslash immediately after a closing delimiter will delete all subsequent newlines until a non-newline. - -eg. - -``` -{{if true}}\ -hello -{{end}}\ -``` - -Will result in: - -``` -hello\n -``` - -Rather than: - -``` -\n -hello\n -\n -``` diff --git a/vendor/github.com/alecthomas/template/doc.go b/vendor/github.com/alecthomas/template/doc.go deleted file mode 100644 index 223c595c2..000000000 --- a/vendor/github.com/alecthomas/template/doc.go +++ /dev/null @@ -1,406 +0,0 @@ -// Copyright 2011 The Go Authors. All rights reserved. -// Use of this source code is governed by a BSD-style -// license that can be found in the LICENSE file. - -/* -Package template implements data-driven templates for generating textual output. - -To generate HTML output, see package html/template, which has the same interface -as this package but automatically secures HTML output against certain attacks. - -Templates are executed by applying them to a data structure. Annotations in the -template refer to elements of the data structure (typically a field of a struct -or a key in a map) to control execution and derive values to be displayed. -Execution of the template walks the structure and sets the cursor, represented -by a period '.' and called "dot", to the value at the current location in the -structure as execution proceeds. - -The input text for a template is UTF-8-encoded text in any format. -"Actions"--data evaluations or control structures--are delimited by -"{{" and "}}"; all text outside actions is copied to the output unchanged. -Actions may not span newlines, although comments can. - -Once parsed, a template may be executed safely in parallel. - -Here is a trivial example that prints "17 items are made of wool". - - type Inventory struct { - Material string - Count uint - } - sweaters := Inventory{"wool", 17} - tmpl, err := template.New("test").Parse("{{.Count}} items are made of {{.Material}}") - if err != nil { panic(err) } - err = tmpl.Execute(os.Stdout, sweaters) - if err != nil { panic(err) } - -More intricate examples appear below. - -Actions - -Here is the list of actions. "Arguments" and "pipelines" are evaluations of -data, defined in detail below. - -*/ -// {{/* a comment */}} -// A comment; discarded. May contain newlines. -// Comments do not nest and must start and end at the -// delimiters, as shown here. -/* - - {{pipeline}} - The default textual representation of the value of the pipeline - is copied to the output. - - {{if pipeline}} T1 {{end}} - If the value of the pipeline is empty, no output is generated; - otherwise, T1 is executed. The empty values are false, 0, any - nil pointer or interface value, and any array, slice, map, or - string of length zero. - Dot is unaffected. - - {{if pipeline}} T1 {{else}} T0 {{end}} - If the value of the pipeline is empty, T0 is executed; - otherwise, T1 is executed. Dot is unaffected. - - {{if pipeline}} T1 {{else if pipeline}} T0 {{end}} - To simplify the appearance of if-else chains, the else action - of an if may include another if directly; the effect is exactly - the same as writing - {{if pipeline}} T1 {{else}}{{if pipeline}} T0 {{end}}{{end}} - - {{range pipeline}} T1 {{end}} - The value of the pipeline must be an array, slice, map, or channel. - If the value of the pipeline has length zero, nothing is output; - otherwise, dot is set to the successive elements of the array, - slice, or map and T1 is executed. If the value is a map and the - keys are of basic type with a defined order ("comparable"), the - elements will be visited in sorted key order. - - {{range pipeline}} T1 {{else}} T0 {{end}} - The value of the pipeline must be an array, slice, map, or channel. - If the value of the pipeline has length zero, dot is unaffected and - T0 is executed; otherwise, dot is set to the successive elements - of the array, slice, or map and T1 is executed. - - {{template "name"}} - The template with the specified name is executed with nil data. - - {{template "name" pipeline}} - The template with the specified name is executed with dot set - to the value of the pipeline. - - {{with pipeline}} T1 {{end}} - If the value of the pipeline is empty, no output is generated; - otherwise, dot is set to the value of the pipeline and T1 is - executed. - - {{with pipeline}} T1 {{else}} T0 {{end}} - If the value of the pipeline is empty, dot is unaffected and T0 - is executed; otherwise, dot is set to the value of the pipeline - and T1 is executed. - -Arguments - -An argument is a simple value, denoted by one of the following. - - - A boolean, string, character, integer, floating-point, imaginary - or complex constant in Go syntax. These behave like Go's untyped - constants, although raw strings may not span newlines. - - The keyword nil, representing an untyped Go nil. - - The character '.' (period): - . - The result is the value of dot. - - A variable name, which is a (possibly empty) alphanumeric string - preceded by a dollar sign, such as - $piOver2 - or - $ - The result is the value of the variable. - Variables are described below. - - The name of a field of the data, which must be a struct, preceded - by a period, such as - .Field - The result is the value of the field. Field invocations may be - chained: - .Field1.Field2 - Fields can also be evaluated on variables, including chaining: - $x.Field1.Field2 - - The name of a key of the data, which must be a map, preceded - by a period, such as - .Key - The result is the map element value indexed by the key. - Key invocations may be chained and combined with fields to any - depth: - .Field1.Key1.Field2.Key2 - Although the key must be an alphanumeric identifier, unlike with - field names they do not need to start with an upper case letter. - Keys can also be evaluated on variables, including chaining: - $x.key1.key2 - - The name of a niladic method of the data, preceded by a period, - such as - .Method - The result is the value of invoking the method with dot as the - receiver, dot.Method(). Such a method must have one return value (of - any type) or two return values, the second of which is an error. - If it has two and the returned error is non-nil, execution terminates - and an error is returned to the caller as the value of Execute. - Method invocations may be chained and combined with fields and keys - to any depth: - .Field1.Key1.Method1.Field2.Key2.Method2 - Methods can also be evaluated on variables, including chaining: - $x.Method1.Field - - The name of a niladic function, such as - fun - The result is the value of invoking the function, fun(). The return - types and values behave as in methods. Functions and function - names are described below. - - A parenthesized instance of one the above, for grouping. The result - may be accessed by a field or map key invocation. - print (.F1 arg1) (.F2 arg2) - (.StructValuedMethod "arg").Field - -Arguments may evaluate to any type; if they are pointers the implementation -automatically indirects to the base type when required. -If an evaluation yields a function value, such as a function-valued -field of a struct, the function is not invoked automatically, but it -can be used as a truth value for an if action and the like. To invoke -it, use the call function, defined below. - -A pipeline is a possibly chained sequence of "commands". A command is a simple -value (argument) or a function or method call, possibly with multiple arguments: - - Argument - The result is the value of evaluating the argument. - .Method [Argument...] - The method can be alone or the last element of a chain but, - unlike methods in the middle of a chain, it can take arguments. - The result is the value of calling the method with the - arguments: - dot.Method(Argument1, etc.) - functionName [Argument...] - The result is the value of calling the function associated - with the name: - function(Argument1, etc.) - Functions and function names are described below. - -Pipelines - -A pipeline may be "chained" by separating a sequence of commands with pipeline -characters '|'. In a chained pipeline, the result of the each command is -passed as the last argument of the following command. The output of the final -command in the pipeline is the value of the pipeline. - -The output of a command will be either one value or two values, the second of -which has type error. If that second value is present and evaluates to -non-nil, execution terminates and the error is returned to the caller of -Execute. - -Variables - -A pipeline inside an action may initialize a variable to capture the result. -The initialization has syntax - - $variable := pipeline - -where $variable is the name of the variable. An action that declares a -variable produces no output. - -If a "range" action initializes a variable, the variable is set to the -successive elements of the iteration. Also, a "range" may declare two -variables, separated by a comma: - - range $index, $element := pipeline - -in which case $index and $element are set to the successive values of the -array/slice index or map key and element, respectively. Note that if there is -only one variable, it is assigned the element; this is opposite to the -convention in Go range clauses. - -A variable's scope extends to the "end" action of the control structure ("if", -"with", or "range") in which it is declared, or to the end of the template if -there is no such control structure. A template invocation does not inherit -variables from the point of its invocation. - -When execution begins, $ is set to the data argument passed to Execute, that is, -to the starting value of dot. - -Examples - -Here are some example one-line templates demonstrating pipelines and variables. -All produce the quoted word "output": - - {{"\"output\""}} - A string constant. - {{`"output"`}} - A raw string constant. - {{printf "%q" "output"}} - A function call. - {{"output" | printf "%q"}} - A function call whose final argument comes from the previous - command. - {{printf "%q" (print "out" "put")}} - A parenthesized argument. - {{"put" | printf "%s%s" "out" | printf "%q"}} - A more elaborate call. - {{"output" | printf "%s" | printf "%q"}} - A longer chain. - {{with "output"}}{{printf "%q" .}}{{end}} - A with action using dot. - {{with $x := "output" | printf "%q"}}{{$x}}{{end}} - A with action that creates and uses a variable. - {{with $x := "output"}}{{printf "%q" $x}}{{end}} - A with action that uses the variable in another action. - {{with $x := "output"}}{{$x | printf "%q"}}{{end}} - The same, but pipelined. - -Functions - -During execution functions are found in two function maps: first in the -template, then in the global function map. By default, no functions are defined -in the template but the Funcs method can be used to add them. - -Predefined global functions are named as follows. - - and - Returns the boolean AND of its arguments by returning the - first empty argument or the last argument, that is, - "and x y" behaves as "if x then y else x". All the - arguments are evaluated. - call - Returns the result of calling the first argument, which - must be a function, with the remaining arguments as parameters. - Thus "call .X.Y 1 2" is, in Go notation, dot.X.Y(1, 2) where - Y is a func-valued field, map entry, or the like. - The first argument must be the result of an evaluation - that yields a value of function type (as distinct from - a predefined function such as print). The function must - return either one or two result values, the second of which - is of type error. If the arguments don't match the function - or the returned error value is non-nil, execution stops. - html - Returns the escaped HTML equivalent of the textual - representation of its arguments. - index - Returns the result of indexing its first argument by the - following arguments. Thus "index x 1 2 3" is, in Go syntax, - x[1][2][3]. Each indexed item must be a map, slice, or array. - js - Returns the escaped JavaScript equivalent of the textual - representation of its arguments. - len - Returns the integer length of its argument. - not - Returns the boolean negation of its single argument. - or - Returns the boolean OR of its arguments by returning the - first non-empty argument or the last argument, that is, - "or x y" behaves as "if x then x else y". All the - arguments are evaluated. - print - An alias for fmt.Sprint - printf - An alias for fmt.Sprintf - println - An alias for fmt.Sprintln - urlquery - Returns the escaped value of the textual representation of - its arguments in a form suitable for embedding in a URL query. - -The boolean functions take any zero value to be false and a non-zero -value to be true. - -There is also a set of binary comparison operators defined as -functions: - - eq - Returns the boolean truth of arg1 == arg2 - ne - Returns the boolean truth of arg1 != arg2 - lt - Returns the boolean truth of arg1 < arg2 - le - Returns the boolean truth of arg1 <= arg2 - gt - Returns the boolean truth of arg1 > arg2 - ge - Returns the boolean truth of arg1 >= arg2 - -For simpler multi-way equality tests, eq (only) accepts two or more -arguments and compares the second and subsequent to the first, -returning in effect - - arg1==arg2 || arg1==arg3 || arg1==arg4 ... - -(Unlike with || in Go, however, eq is a function call and all the -arguments will be evaluated.) - -The comparison functions work on basic types only (or named basic -types, such as "type Celsius float32"). They implement the Go rules -for comparison of values, except that size and exact type are -ignored, so any integer value, signed or unsigned, may be compared -with any other integer value. (The arithmetic value is compared, -not the bit pattern, so all negative integers are less than all -unsigned integers.) However, as usual, one may not compare an int -with a float32 and so on. - -Associated templates - -Each template is named by a string specified when it is created. Also, each -template is associated with zero or more other templates that it may invoke by -name; such associations are transitive and form a name space of templates. - -A template may use a template invocation to instantiate another associated -template; see the explanation of the "template" action above. The name must be -that of a template associated with the template that contains the invocation. - -Nested template definitions - -When parsing a template, another template may be defined and associated with the -template being parsed. Template definitions must appear at the top level of the -template, much like global variables in a Go program. - -The syntax of such definitions is to surround each template declaration with a -"define" and "end" action. - -The define action names the template being created by providing a string -constant. Here is a simple example: - - `{{define "T1"}}ONE{{end}} - {{define "T2"}}TWO{{end}} - {{define "T3"}}{{template "T1"}} {{template "T2"}}{{end}} - {{template "T3"}}` - -This defines two templates, T1 and T2, and a third T3 that invokes the other two -when it is executed. Finally it invokes T3. If executed this template will -produce the text - - ONE TWO - -By construction, a template may reside in only one association. If it's -necessary to have a template addressable from multiple associations, the -template definition must be parsed multiple times to create distinct *Template -values, or must be copied with the Clone or AddParseTree method. - -Parse may be called multiple times to assemble the various associated templates; -see the ParseFiles and ParseGlob functions and methods for simple ways to parse -related templates stored in files. - -A template may be executed directly or through ExecuteTemplate, which executes -an associated template identified by name. To invoke our example above, we -might write, - - err := tmpl.Execute(os.Stdout, "no data needed") - if err != nil { - log.Fatalf("execution failed: %s", err) - } - -or to invoke a particular template explicitly by name, - - err := tmpl.ExecuteTemplate(os.Stdout, "T2", "no data needed") - if err != nil { - log.Fatalf("execution failed: %s", err) - } - -*/ -package template diff --git a/vendor/github.com/alecthomas/template/exec.go b/vendor/github.com/alecthomas/template/exec.go deleted file mode 100644 index c3078e5d0..000000000 --- a/vendor/github.com/alecthomas/template/exec.go +++ /dev/null @@ -1,845 +0,0 @@ -// Copyright 2011 The Go Authors. All rights reserved. -// Use of this source code is governed by a BSD-style -// license that can be found in the LICENSE file. - -package template - -import ( - "bytes" - "fmt" - "io" - "reflect" - "runtime" - "sort" - "strings" - - "github.com/alecthomas/template/parse" -) - -// state represents the state of an execution. It's not part of the -// template so that multiple executions of the same template -// can execute in parallel. -type state struct { - tmpl *Template - wr io.Writer - node parse.Node // current node, for errors - vars []variable // push-down stack of variable values. -} - -// variable holds the dynamic value of a variable such as $, $x etc. -type variable struct { - name string - value reflect.Value -} - -// push pushes a new variable on the stack. -func (s *state) push(name string, value reflect.Value) { - s.vars = append(s.vars, variable{name, value}) -} - -// mark returns the length of the variable stack. -func (s *state) mark() int { - return len(s.vars) -} - -// pop pops the variable stack up to the mark. -func (s *state) pop(mark int) { - s.vars = s.vars[0:mark] -} - -// setVar overwrites the top-nth variable on the stack. Used by range iterations. -func (s *state) setVar(n int, value reflect.Value) { - s.vars[len(s.vars)-n].value = value -} - -// varValue returns the value of the named variable. -func (s *state) varValue(name string) reflect.Value { - for i := s.mark() - 1; i >= 0; i-- { - if s.vars[i].name == name { - return s.vars[i].value - } - } - s.errorf("undefined variable: %s", name) - return zero -} - -var zero reflect.Value - -// at marks the state to be on node n, for error reporting. -func (s *state) at(node parse.Node) { - s.node = node -} - -// doublePercent returns the string with %'s replaced by %%, if necessary, -// so it can be used safely inside a Printf format string. -func doublePercent(str string) string { - if strings.Contains(str, "%") { - str = strings.Replace(str, "%", "%%", -1) - } - return str -} - -// errorf formats the error and terminates processing. -func (s *state) errorf(format string, args ...interface{}) { - name := doublePercent(s.tmpl.Name()) - if s.node == nil { - format = fmt.Sprintf("template: %s: %s", name, format) - } else { - location, context := s.tmpl.ErrorContext(s.node) - format = fmt.Sprintf("template: %s: executing %q at <%s>: %s", location, name, doublePercent(context), format) - } - panic(fmt.Errorf(format, args...)) -} - -// errRecover is the handler that turns panics into returns from the top -// level of Parse. -func errRecover(errp *error) { - e := recover() - if e != nil { - switch err := e.(type) { - case runtime.Error: - panic(e) - case error: - *errp = err - default: - panic(e) - } - } -} - -// ExecuteTemplate applies the template associated with t that has the given name -// to the specified data object and writes the output to wr. -// If an error occurs executing the template or writing its output, -// execution stops, but partial results may already have been written to -// the output writer. -// A template may be executed safely in parallel. -func (t *Template) ExecuteTemplate(wr io.Writer, name string, data interface{}) error { - tmpl := t.tmpl[name] - if tmpl == nil { - return fmt.Errorf("template: no template %q associated with template %q", name, t.name) - } - return tmpl.Execute(wr, data) -} - -// Execute applies a parsed template to the specified data object, -// and writes the output to wr. -// If an error occurs executing the template or writing its output, -// execution stops, but partial results may already have been written to -// the output writer. -// A template may be executed safely in parallel. -func (t *Template) Execute(wr io.Writer, data interface{}) (err error) { - defer errRecover(&err) - value := reflect.ValueOf(data) - state := &state{ - tmpl: t, - wr: wr, - vars: []variable{{"$", value}}, - } - t.init() - if t.Tree == nil || t.Root == nil { - var b bytes.Buffer - for name, tmpl := range t.tmpl { - if tmpl.Tree == nil || tmpl.Root == nil { - continue - } - if b.Len() > 0 { - b.WriteString(", ") - } - fmt.Fprintf(&b, "%q", name) - } - var s string - if b.Len() > 0 { - s = "; defined templates are: " + b.String() - } - state.errorf("%q is an incomplete or empty template%s", t.Name(), s) - } - state.walk(value, t.Root) - return -} - -// Walk functions step through the major pieces of the template structure, -// generating output as they go. -func (s *state) walk(dot reflect.Value, node parse.Node) { - s.at(node) - switch node := node.(type) { - case *parse.ActionNode: - // Do not pop variables so they persist until next end. - // Also, if the action declares variables, don't print the result. - val := s.evalPipeline(dot, node.Pipe) - if len(node.Pipe.Decl) == 0 { - s.printValue(node, val) - } - case *parse.IfNode: - s.walkIfOrWith(parse.NodeIf, dot, node.Pipe, node.List, node.ElseList) - case *parse.ListNode: - for _, node := range node.Nodes { - s.walk(dot, node) - } - case *parse.RangeNode: - s.walkRange(dot, node) - case *parse.TemplateNode: - s.walkTemplate(dot, node) - case *parse.TextNode: - if _, err := s.wr.Write(node.Text); err != nil { - s.errorf("%s", err) - } - case *parse.WithNode: - s.walkIfOrWith(parse.NodeWith, dot, node.Pipe, node.List, node.ElseList) - default: - s.errorf("unknown node: %s", node) - } -} - -// walkIfOrWith walks an 'if' or 'with' node. The two control structures -// are identical in behavior except that 'with' sets dot. -func (s *state) walkIfOrWith(typ parse.NodeType, dot reflect.Value, pipe *parse.PipeNode, list, elseList *parse.ListNode) { - defer s.pop(s.mark()) - val := s.evalPipeline(dot, pipe) - truth, ok := isTrue(val) - if !ok { - s.errorf("if/with can't use %v", val) - } - if truth { - if typ == parse.NodeWith { - s.walk(val, list) - } else { - s.walk(dot, list) - } - } else if elseList != nil { - s.walk(dot, elseList) - } -} - -// isTrue reports whether the value is 'true', in the sense of not the zero of its type, -// and whether the value has a meaningful truth value. -func isTrue(val reflect.Value) (truth, ok bool) { - if !val.IsValid() { - // Something like var x interface{}, never set. It's a form of nil. - return false, true - } - switch val.Kind() { - case reflect.Array, reflect.Map, reflect.Slice, reflect.String: - truth = val.Len() > 0 - case reflect.Bool: - truth = val.Bool() - case reflect.Complex64, reflect.Complex128: - truth = val.Complex() != 0 - case reflect.Chan, reflect.Func, reflect.Ptr, reflect.Interface: - truth = !val.IsNil() - case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64: - truth = val.Int() != 0 - case reflect.Float32, reflect.Float64: - truth = val.Float() != 0 - case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr: - truth = val.Uint() != 0 - case reflect.Struct: - truth = true // Struct values are always true. - default: - return - } - return truth, true -} - -func (s *state) walkRange(dot reflect.Value, r *parse.RangeNode) { - s.at(r) - defer s.pop(s.mark()) - val, _ := indirect(s.evalPipeline(dot, r.Pipe)) - // mark top of stack before any variables in the body are pushed. - mark := s.mark() - oneIteration := func(index, elem reflect.Value) { - // Set top var (lexically the second if there are two) to the element. - if len(r.Pipe.Decl) > 0 { - s.setVar(1, elem) - } - // Set next var (lexically the first if there are two) to the index. - if len(r.Pipe.Decl) > 1 { - s.setVar(2, index) - } - s.walk(elem, r.List) - s.pop(mark) - } - switch val.Kind() { - case reflect.Array, reflect.Slice: - if val.Len() == 0 { - break - } - for i := 0; i < val.Len(); i++ { - oneIteration(reflect.ValueOf(i), val.Index(i)) - } - return - case reflect.Map: - if val.Len() == 0 { - break - } - for _, key := range sortKeys(val.MapKeys()) { - oneIteration(key, val.MapIndex(key)) - } - return - case reflect.Chan: - if val.IsNil() { - break - } - i := 0 - for ; ; i++ { - elem, ok := val.Recv() - if !ok { - break - } - oneIteration(reflect.ValueOf(i), elem) - } - if i == 0 { - break - } - return - case reflect.Invalid: - break // An invalid value is likely a nil map, etc. and acts like an empty map. - default: - s.errorf("range can't iterate over %v", val) - } - if r.ElseList != nil { - s.walk(dot, r.ElseList) - } -} - -func (s *state) walkTemplate(dot reflect.Value, t *parse.TemplateNode) { - s.at(t) - tmpl := s.tmpl.tmpl[t.Name] - if tmpl == nil { - s.errorf("template %q not defined", t.Name) - } - // Variables declared by the pipeline persist. - dot = s.evalPipeline(dot, t.Pipe) - newState := *s - newState.tmpl = tmpl - // No dynamic scoping: template invocations inherit no variables. - newState.vars = []variable{{"$", dot}} - newState.walk(dot, tmpl.Root) -} - -// Eval functions evaluate pipelines, commands, and their elements and extract -// values from the data structure by examining fields, calling methods, and so on. -// The printing of those values happens only through walk functions. - -// evalPipeline returns the value acquired by evaluating a pipeline. If the -// pipeline has a variable declaration, the variable will be pushed on the -// stack. Callers should therefore pop the stack after they are finished -// executing commands depending on the pipeline value. -func (s *state) evalPipeline(dot reflect.Value, pipe *parse.PipeNode) (value reflect.Value) { - if pipe == nil { - return - } - s.at(pipe) - for _, cmd := range pipe.Cmds { - value = s.evalCommand(dot, cmd, value) // previous value is this one's final arg. - // If the object has type interface{}, dig down one level to the thing inside. - if value.Kind() == reflect.Interface && value.Type().NumMethod() == 0 { - value = reflect.ValueOf(value.Interface()) // lovely! - } - } - for _, variable := range pipe.Decl { - s.push(variable.Ident[0], value) - } - return value -} - -func (s *state) notAFunction(args []parse.Node, final reflect.Value) { - if len(args) > 1 || final.IsValid() { - s.errorf("can't give argument to non-function %s", args[0]) - } -} - -func (s *state) evalCommand(dot reflect.Value, cmd *parse.CommandNode, final reflect.Value) reflect.Value { - firstWord := cmd.Args[0] - switch n := firstWord.(type) { - case *parse.FieldNode: - return s.evalFieldNode(dot, n, cmd.Args, final) - case *parse.ChainNode: - return s.evalChainNode(dot, n, cmd.Args, final) - case *parse.IdentifierNode: - // Must be a function. - return s.evalFunction(dot, n, cmd, cmd.Args, final) - case *parse.PipeNode: - // Parenthesized pipeline. The arguments are all inside the pipeline; final is ignored. - return s.evalPipeline(dot, n) - case *parse.VariableNode: - return s.evalVariableNode(dot, n, cmd.Args, final) - } - s.at(firstWord) - s.notAFunction(cmd.Args, final) - switch word := firstWord.(type) { - case *parse.BoolNode: - return reflect.ValueOf(word.True) - case *parse.DotNode: - return dot - case *parse.NilNode: - s.errorf("nil is not a command") - case *parse.NumberNode: - return s.idealConstant(word) - case *parse.StringNode: - return reflect.ValueOf(word.Text) - } - s.errorf("can't evaluate command %q", firstWord) - panic("not reached") -} - -// idealConstant is called to return the value of a number in a context where -// we don't know the type. In that case, the syntax of the number tells us -// its type, and we use Go rules to resolve. Note there is no such thing as -// a uint ideal constant in this situation - the value must be of int type. -func (s *state) idealConstant(constant *parse.NumberNode) reflect.Value { - // These are ideal constants but we don't know the type - // and we have no context. (If it was a method argument, - // we'd know what we need.) The syntax guides us to some extent. - s.at(constant) - switch { - case constant.IsComplex: - return reflect.ValueOf(constant.Complex128) // incontrovertible. - case constant.IsFloat && !isHexConstant(constant.Text) && strings.IndexAny(constant.Text, ".eE") >= 0: - return reflect.ValueOf(constant.Float64) - case constant.IsInt: - n := int(constant.Int64) - if int64(n) != constant.Int64 { - s.errorf("%s overflows int", constant.Text) - } - return reflect.ValueOf(n) - case constant.IsUint: - s.errorf("%s overflows int", constant.Text) - } - return zero -} - -func isHexConstant(s string) bool { - return len(s) > 2 && s[0] == '0' && (s[1] == 'x' || s[1] == 'X') -} - -func (s *state) evalFieldNode(dot reflect.Value, field *parse.FieldNode, args []parse.Node, final reflect.Value) reflect.Value { - s.at(field) - return s.evalFieldChain(dot, dot, field, field.Ident, args, final) -} - -func (s *state) evalChainNode(dot reflect.Value, chain *parse.ChainNode, args []parse.Node, final reflect.Value) reflect.Value { - s.at(chain) - // (pipe).Field1.Field2 has pipe as .Node, fields as .Field. Eval the pipeline, then the fields. - pipe := s.evalArg(dot, nil, chain.Node) - if len(chain.Field) == 0 { - s.errorf("internal error: no fields in evalChainNode") - } - return s.evalFieldChain(dot, pipe, chain, chain.Field, args, final) -} - -func (s *state) evalVariableNode(dot reflect.Value, variable *parse.VariableNode, args []parse.Node, final reflect.Value) reflect.Value { - // $x.Field has $x as the first ident, Field as the second. Eval the var, then the fields. - s.at(variable) - value := s.varValue(variable.Ident[0]) - if len(variable.Ident) == 1 { - s.notAFunction(args, final) - return value - } - return s.evalFieldChain(dot, value, variable, variable.Ident[1:], args, final) -} - -// evalFieldChain evaluates .X.Y.Z possibly followed by arguments. -// dot is the environment in which to evaluate arguments, while -// receiver is the value being walked along the chain. -func (s *state) evalFieldChain(dot, receiver reflect.Value, node parse.Node, ident []string, args []parse.Node, final reflect.Value) reflect.Value { - n := len(ident) - for i := 0; i < n-1; i++ { - receiver = s.evalField(dot, ident[i], node, nil, zero, receiver) - } - // Now if it's a method, it gets the arguments. - return s.evalField(dot, ident[n-1], node, args, final, receiver) -} - -func (s *state) evalFunction(dot reflect.Value, node *parse.IdentifierNode, cmd parse.Node, args []parse.Node, final reflect.Value) reflect.Value { - s.at(node) - name := node.Ident - function, ok := findFunction(name, s.tmpl) - if !ok { - s.errorf("%q is not a defined function", name) - } - return s.evalCall(dot, function, cmd, name, args, final) -} - -// evalField evaluates an expression like (.Field) or (.Field arg1 arg2). -// The 'final' argument represents the return value from the preceding -// value of the pipeline, if any. -func (s *state) evalField(dot reflect.Value, fieldName string, node parse.Node, args []parse.Node, final, receiver reflect.Value) reflect.Value { - if !receiver.IsValid() { - return zero - } - typ := receiver.Type() - receiver, _ = indirect(receiver) - // Unless it's an interface, need to get to a value of type *T to guarantee - // we see all methods of T and *T. - ptr := receiver - if ptr.Kind() != reflect.Interface && ptr.CanAddr() { - ptr = ptr.Addr() - } - if method := ptr.MethodByName(fieldName); method.IsValid() { - return s.evalCall(dot, method, node, fieldName, args, final) - } - hasArgs := len(args) > 1 || final.IsValid() - // It's not a method; must be a field of a struct or an element of a map. The receiver must not be nil. - receiver, isNil := indirect(receiver) - if isNil { - s.errorf("nil pointer evaluating %s.%s", typ, fieldName) - } - switch receiver.Kind() { - case reflect.Struct: - tField, ok := receiver.Type().FieldByName(fieldName) - if ok { - field := receiver.FieldByIndex(tField.Index) - if tField.PkgPath != "" { // field is unexported - s.errorf("%s is an unexported field of struct type %s", fieldName, typ) - } - // If it's a function, we must call it. - if hasArgs { - s.errorf("%s has arguments but cannot be invoked as function", fieldName) - } - return field - } - s.errorf("%s is not a field of struct type %s", fieldName, typ) - case reflect.Map: - // If it's a map, attempt to use the field name as a key. - nameVal := reflect.ValueOf(fieldName) - if nameVal.Type().AssignableTo(receiver.Type().Key()) { - if hasArgs { - s.errorf("%s is not a method but has arguments", fieldName) - } - return receiver.MapIndex(nameVal) - } - } - s.errorf("can't evaluate field %s in type %s", fieldName, typ) - panic("not reached") -} - -var ( - errorType = reflect.TypeOf((*error)(nil)).Elem() - fmtStringerType = reflect.TypeOf((*fmt.Stringer)(nil)).Elem() -) - -// evalCall executes a function or method call. If it's a method, fun already has the receiver bound, so -// it looks just like a function call. The arg list, if non-nil, includes (in the manner of the shell), arg[0] -// as the function itself. -func (s *state) evalCall(dot, fun reflect.Value, node parse.Node, name string, args []parse.Node, final reflect.Value) reflect.Value { - if args != nil { - args = args[1:] // Zeroth arg is function name/node; not passed to function. - } - typ := fun.Type() - numIn := len(args) - if final.IsValid() { - numIn++ - } - numFixed := len(args) - if typ.IsVariadic() { - numFixed = typ.NumIn() - 1 // last arg is the variadic one. - if numIn < numFixed { - s.errorf("wrong number of args for %s: want at least %d got %d", name, typ.NumIn()-1, len(args)) - } - } else if numIn < typ.NumIn()-1 || !typ.IsVariadic() && numIn != typ.NumIn() { - s.errorf("wrong number of args for %s: want %d got %d", name, typ.NumIn(), len(args)) - } - if !goodFunc(typ) { - // TODO: This could still be a confusing error; maybe goodFunc should provide info. - s.errorf("can't call method/function %q with %d results", name, typ.NumOut()) - } - // Build the arg list. - argv := make([]reflect.Value, numIn) - // Args must be evaluated. Fixed args first. - i := 0 - for ; i < numFixed && i < len(args); i++ { - argv[i] = s.evalArg(dot, typ.In(i), args[i]) - } - // Now the ... args. - if typ.IsVariadic() { - argType := typ.In(typ.NumIn() - 1).Elem() // Argument is a slice. - for ; i < len(args); i++ { - argv[i] = s.evalArg(dot, argType, args[i]) - } - } - // Add final value if necessary. - if final.IsValid() { - t := typ.In(typ.NumIn() - 1) - if typ.IsVariadic() { - t = t.Elem() - } - argv[i] = s.validateType(final, t) - } - result := fun.Call(argv) - // If we have an error that is not nil, stop execution and return that error to the caller. - if len(result) == 2 && !result[1].IsNil() { - s.at(node) - s.errorf("error calling %s: %s", name, result[1].Interface().(error)) - } - return result[0] -} - -// canBeNil reports whether an untyped nil can be assigned to the type. See reflect.Zero. -func canBeNil(typ reflect.Type) bool { - switch typ.Kind() { - case reflect.Chan, reflect.Func, reflect.Interface, reflect.Map, reflect.Ptr, reflect.Slice: - return true - } - return false -} - -// validateType guarantees that the value is valid and assignable to the type. -func (s *state) validateType(value reflect.Value, typ reflect.Type) reflect.Value { - if !value.IsValid() { - if typ == nil || canBeNil(typ) { - // An untyped nil interface{}. Accept as a proper nil value. - return reflect.Zero(typ) - } - s.errorf("invalid value; expected %s", typ) - } - if typ != nil && !value.Type().AssignableTo(typ) { - if value.Kind() == reflect.Interface && !value.IsNil() { - value = value.Elem() - if value.Type().AssignableTo(typ) { - return value - } - // fallthrough - } - // Does one dereference or indirection work? We could do more, as we - // do with method receivers, but that gets messy and method receivers - // are much more constrained, so it makes more sense there than here. - // Besides, one is almost always all you need. - switch { - case value.Kind() == reflect.Ptr && value.Type().Elem().AssignableTo(typ): - value = value.Elem() - if !value.IsValid() { - s.errorf("dereference of nil pointer of type %s", typ) - } - case reflect.PtrTo(value.Type()).AssignableTo(typ) && value.CanAddr(): - value = value.Addr() - default: - s.errorf("wrong type for value; expected %s; got %s", typ, value.Type()) - } - } - return value -} - -func (s *state) evalArg(dot reflect.Value, typ reflect.Type, n parse.Node) reflect.Value { - s.at(n) - switch arg := n.(type) { - case *parse.DotNode: - return s.validateType(dot, typ) - case *parse.NilNode: - if canBeNil(typ) { - return reflect.Zero(typ) - } - s.errorf("cannot assign nil to %s", typ) - case *parse.FieldNode: - return s.validateType(s.evalFieldNode(dot, arg, []parse.Node{n}, zero), typ) - case *parse.VariableNode: - return s.validateType(s.evalVariableNode(dot, arg, nil, zero), typ) - case *parse.PipeNode: - return s.validateType(s.evalPipeline(dot, arg), typ) - case *parse.IdentifierNode: - return s.evalFunction(dot, arg, arg, nil, zero) - case *parse.ChainNode: - return s.validateType(s.evalChainNode(dot, arg, nil, zero), typ) - } - switch typ.Kind() { - case reflect.Bool: - return s.evalBool(typ, n) - case reflect.Complex64, reflect.Complex128: - return s.evalComplex(typ, n) - case reflect.Float32, reflect.Float64: - return s.evalFloat(typ, n) - case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64: - return s.evalInteger(typ, n) - case reflect.Interface: - if typ.NumMethod() == 0 { - return s.evalEmptyInterface(dot, n) - } - case reflect.String: - return s.evalString(typ, n) - case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr: - return s.evalUnsignedInteger(typ, n) - } - s.errorf("can't handle %s for arg of type %s", n, typ) - panic("not reached") -} - -func (s *state) evalBool(typ reflect.Type, n parse.Node) reflect.Value { - s.at(n) - if n, ok := n.(*parse.BoolNode); ok { - value := reflect.New(typ).Elem() - value.SetBool(n.True) - return value - } - s.errorf("expected bool; found %s", n) - panic("not reached") -} - -func (s *state) evalString(typ reflect.Type, n parse.Node) reflect.Value { - s.at(n) - if n, ok := n.(*parse.StringNode); ok { - value := reflect.New(typ).Elem() - value.SetString(n.Text) - return value - } - s.errorf("expected string; found %s", n) - panic("not reached") -} - -func (s *state) evalInteger(typ reflect.Type, n parse.Node) reflect.Value { - s.at(n) - if n, ok := n.(*parse.NumberNode); ok && n.IsInt { - value := reflect.New(typ).Elem() - value.SetInt(n.Int64) - return value - } - s.errorf("expected integer; found %s", n) - panic("not reached") -} - -func (s *state) evalUnsignedInteger(typ reflect.Type, n parse.Node) reflect.Value { - s.at(n) - if n, ok := n.(*parse.NumberNode); ok && n.IsUint { - value := reflect.New(typ).Elem() - value.SetUint(n.Uint64) - return value - } - s.errorf("expected unsigned integer; found %s", n) - panic("not reached") -} - -func (s *state) evalFloat(typ reflect.Type, n parse.Node) reflect.Value { - s.at(n) - if n, ok := n.(*parse.NumberNode); ok && n.IsFloat { - value := reflect.New(typ).Elem() - value.SetFloat(n.Float64) - return value - } - s.errorf("expected float; found %s", n) - panic("not reached") -} - -func (s *state) evalComplex(typ reflect.Type, n parse.Node) reflect.Value { - if n, ok := n.(*parse.NumberNode); ok && n.IsComplex { - value := reflect.New(typ).Elem() - value.SetComplex(n.Complex128) - return value - } - s.errorf("expected complex; found %s", n) - panic("not reached") -} - -func (s *state) evalEmptyInterface(dot reflect.Value, n parse.Node) reflect.Value { - s.at(n) - switch n := n.(type) { - case *parse.BoolNode: - return reflect.ValueOf(n.True) - case *parse.DotNode: - return dot - case *parse.FieldNode: - return s.evalFieldNode(dot, n, nil, zero) - case *parse.IdentifierNode: - return s.evalFunction(dot, n, n, nil, zero) - case *parse.NilNode: - // NilNode is handled in evalArg, the only place that calls here. - s.errorf("evalEmptyInterface: nil (can't happen)") - case *parse.NumberNode: - return s.idealConstant(n) - case *parse.StringNode: - return reflect.ValueOf(n.Text) - case *parse.VariableNode: - return s.evalVariableNode(dot, n, nil, zero) - case *parse.PipeNode: - return s.evalPipeline(dot, n) - } - s.errorf("can't handle assignment of %s to empty interface argument", n) - panic("not reached") -} - -// indirect returns the item at the end of indirection, and a bool to indicate if it's nil. -// We indirect through pointers and empty interfaces (only) because -// non-empty interfaces have methods we might need. -func indirect(v reflect.Value) (rv reflect.Value, isNil bool) { - for ; v.Kind() == reflect.Ptr || v.Kind() == reflect.Interface; v = v.Elem() { - if v.IsNil() { - return v, true - } - if v.Kind() == reflect.Interface && v.NumMethod() > 0 { - break - } - } - return v, false -} - -// printValue writes the textual representation of the value to the output of -// the template. -func (s *state) printValue(n parse.Node, v reflect.Value) { - s.at(n) - iface, ok := printableValue(v) - if !ok { - s.errorf("can't print %s of type %s", n, v.Type()) - } - fmt.Fprint(s.wr, iface) -} - -// printableValue returns the, possibly indirected, interface value inside v that -// is best for a call to formatted printer. -func printableValue(v reflect.Value) (interface{}, bool) { - if v.Kind() == reflect.Ptr { - v, _ = indirect(v) // fmt.Fprint handles nil. - } - if !v.IsValid() { - return "", true - } - - if !v.Type().Implements(errorType) && !v.Type().Implements(fmtStringerType) { - if v.CanAddr() && (reflect.PtrTo(v.Type()).Implements(errorType) || reflect.PtrTo(v.Type()).Implements(fmtStringerType)) { - v = v.Addr() - } else { - switch v.Kind() { - case reflect.Chan, reflect.Func: - return nil, false - } - } - } - return v.Interface(), true -} - -// Types to help sort the keys in a map for reproducible output. - -type rvs []reflect.Value - -func (x rvs) Len() int { return len(x) } -func (x rvs) Swap(i, j int) { x[i], x[j] = x[j], x[i] } - -type rvInts struct{ rvs } - -func (x rvInts) Less(i, j int) bool { return x.rvs[i].Int() < x.rvs[j].Int() } - -type rvUints struct{ rvs } - -func (x rvUints) Less(i, j int) bool { return x.rvs[i].Uint() < x.rvs[j].Uint() } - -type rvFloats struct{ rvs } - -func (x rvFloats) Less(i, j int) bool { return x.rvs[i].Float() < x.rvs[j].Float() } - -type rvStrings struct{ rvs } - -func (x rvStrings) Less(i, j int) bool { return x.rvs[i].String() < x.rvs[j].String() } - -// sortKeys sorts (if it can) the slice of reflect.Values, which is a slice of map keys. -func sortKeys(v []reflect.Value) []reflect.Value { - if len(v) <= 1 { - return v - } - switch v[0].Kind() { - case reflect.Float32, reflect.Float64: - sort.Sort(rvFloats{v}) - case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64: - sort.Sort(rvInts{v}) - case reflect.String: - sort.Sort(rvStrings{v}) - case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr: - sort.Sort(rvUints{v}) - } - return v -} diff --git a/vendor/github.com/alecthomas/template/funcs.go b/vendor/github.com/alecthomas/template/funcs.go deleted file mode 100644 index 39ee5ed68..000000000 --- a/vendor/github.com/alecthomas/template/funcs.go +++ /dev/null @@ -1,598 +0,0 @@ -// Copyright 2011 The Go Authors. All rights reserved. -// Use of this source code is governed by a BSD-style -// license that can be found in the LICENSE file. - -package template - -import ( - "bytes" - "errors" - "fmt" - "io" - "net/url" - "reflect" - "strings" - "unicode" - "unicode/utf8" -) - -// FuncMap is the type of the map defining the mapping from names to functions. -// Each function must have either a single return value, or two return values of -// which the second has type error. In that case, if the second (error) -// return value evaluates to non-nil during execution, execution terminates and -// Execute returns that error. -type FuncMap map[string]interface{} - -var builtins = FuncMap{ - "and": and, - "call": call, - "html": HTMLEscaper, - "index": index, - "js": JSEscaper, - "len": length, - "not": not, - "or": or, - "print": fmt.Sprint, - "printf": fmt.Sprintf, - "println": fmt.Sprintln, - "urlquery": URLQueryEscaper, - - // Comparisons - "eq": eq, // == - "ge": ge, // >= - "gt": gt, // > - "le": le, // <= - "lt": lt, // < - "ne": ne, // != -} - -var builtinFuncs = createValueFuncs(builtins) - -// createValueFuncs turns a FuncMap into a map[string]reflect.Value -func createValueFuncs(funcMap FuncMap) map[string]reflect.Value { - m := make(map[string]reflect.Value) - addValueFuncs(m, funcMap) - return m -} - -// addValueFuncs adds to values the functions in funcs, converting them to reflect.Values. -func addValueFuncs(out map[string]reflect.Value, in FuncMap) { - for name, fn := range in { - v := reflect.ValueOf(fn) - if v.Kind() != reflect.Func { - panic("value for " + name + " not a function") - } - if !goodFunc(v.Type()) { - panic(fmt.Errorf("can't install method/function %q with %d results", name, v.Type().NumOut())) - } - out[name] = v - } -} - -// addFuncs adds to values the functions in funcs. It does no checking of the input - -// call addValueFuncs first. -func addFuncs(out, in FuncMap) { - for name, fn := range in { - out[name] = fn - } -} - -// goodFunc checks that the function or method has the right result signature. -func goodFunc(typ reflect.Type) bool { - // We allow functions with 1 result or 2 results where the second is an error. - switch { - case typ.NumOut() == 1: - return true - case typ.NumOut() == 2 && typ.Out(1) == errorType: - return true - } - return false -} - -// findFunction looks for a function in the template, and global map. -func findFunction(name string, tmpl *Template) (reflect.Value, bool) { - if tmpl != nil && tmpl.common != nil { - if fn := tmpl.execFuncs[name]; fn.IsValid() { - return fn, true - } - } - if fn := builtinFuncs[name]; fn.IsValid() { - return fn, true - } - return reflect.Value{}, false -} - -// Indexing. - -// index returns the result of indexing its first argument by the following -// arguments. Thus "index x 1 2 3" is, in Go syntax, x[1][2][3]. Each -// indexed item must be a map, slice, or array. -func index(item interface{}, indices ...interface{}) (interface{}, error) { - v := reflect.ValueOf(item) - for _, i := range indices { - index := reflect.ValueOf(i) - var isNil bool - if v, isNil = indirect(v); isNil { - return nil, fmt.Errorf("index of nil pointer") - } - switch v.Kind() { - case reflect.Array, reflect.Slice, reflect.String: - var x int64 - switch index.Kind() { - case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64: - x = index.Int() - case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr: - x = int64(index.Uint()) - default: - return nil, fmt.Errorf("cannot index slice/array with type %s", index.Type()) - } - if x < 0 || x >= int64(v.Len()) { - return nil, fmt.Errorf("index out of range: %d", x) - } - v = v.Index(int(x)) - case reflect.Map: - if !index.IsValid() { - index = reflect.Zero(v.Type().Key()) - } - if !index.Type().AssignableTo(v.Type().Key()) { - return nil, fmt.Errorf("%s is not index type for %s", index.Type(), v.Type()) - } - if x := v.MapIndex(index); x.IsValid() { - v = x - } else { - v = reflect.Zero(v.Type().Elem()) - } - default: - return nil, fmt.Errorf("can't index item of type %s", v.Type()) - } - } - return v.Interface(), nil -} - -// Length - -// length returns the length of the item, with an error if it has no defined length. -func length(item interface{}) (int, error) { - v, isNil := indirect(reflect.ValueOf(item)) - if isNil { - return 0, fmt.Errorf("len of nil pointer") - } - switch v.Kind() { - case reflect.Array, reflect.Chan, reflect.Map, reflect.Slice, reflect.String: - return v.Len(), nil - } - return 0, fmt.Errorf("len of type %s", v.Type()) -} - -// Function invocation - -// call returns the result of evaluating the first argument as a function. -// The function must return 1 result, or 2 results, the second of which is an error. -func call(fn interface{}, args ...interface{}) (interface{}, error) { - v := reflect.ValueOf(fn) - typ := v.Type() - if typ.Kind() != reflect.Func { - return nil, fmt.Errorf("non-function of type %s", typ) - } - if !goodFunc(typ) { - return nil, fmt.Errorf("function called with %d args; should be 1 or 2", typ.NumOut()) - } - numIn := typ.NumIn() - var dddType reflect.Type - if typ.IsVariadic() { - if len(args) < numIn-1 { - return nil, fmt.Errorf("wrong number of args: got %d want at least %d", len(args), numIn-1) - } - dddType = typ.In(numIn - 1).Elem() - } else { - if len(args) != numIn { - return nil, fmt.Errorf("wrong number of args: got %d want %d", len(args), numIn) - } - } - argv := make([]reflect.Value, len(args)) - for i, arg := range args { - value := reflect.ValueOf(arg) - // Compute the expected type. Clumsy because of variadics. - var argType reflect.Type - if !typ.IsVariadic() || i < numIn-1 { - argType = typ.In(i) - } else { - argType = dddType - } - if !value.IsValid() && canBeNil(argType) { - value = reflect.Zero(argType) - } - if !value.Type().AssignableTo(argType) { - return nil, fmt.Errorf("arg %d has type %s; should be %s", i, value.Type(), argType) - } - argv[i] = value - } - result := v.Call(argv) - if len(result) == 2 && !result[1].IsNil() { - return result[0].Interface(), result[1].Interface().(error) - } - return result[0].Interface(), nil -} - -// Boolean logic. - -func truth(a interface{}) bool { - t, _ := isTrue(reflect.ValueOf(a)) - return t -} - -// and computes the Boolean AND of its arguments, returning -// the first false argument it encounters, or the last argument. -func and(arg0 interface{}, args ...interface{}) interface{} { - if !truth(arg0) { - return arg0 - } - for i := range args { - arg0 = args[i] - if !truth(arg0) { - break - } - } - return arg0 -} - -// or computes the Boolean OR of its arguments, returning -// the first true argument it encounters, or the last argument. -func or(arg0 interface{}, args ...interface{}) interface{} { - if truth(arg0) { - return arg0 - } - for i := range args { - arg0 = args[i] - if truth(arg0) { - break - } - } - return arg0 -} - -// not returns the Boolean negation of its argument. -func not(arg interface{}) (truth bool) { - truth, _ = isTrue(reflect.ValueOf(arg)) - return !truth -} - -// Comparison. - -// TODO: Perhaps allow comparison between signed and unsigned integers. - -var ( - errBadComparisonType = errors.New("invalid type for comparison") - errBadComparison = errors.New("incompatible types for comparison") - errNoComparison = errors.New("missing argument for comparison") -) - -type kind int - -const ( - invalidKind kind = iota - boolKind - complexKind - intKind - floatKind - integerKind - stringKind - uintKind -) - -func basicKind(v reflect.Value) (kind, error) { - switch v.Kind() { - case reflect.Bool: - return boolKind, nil - case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64: - return intKind, nil - case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr: - return uintKind, nil - case reflect.Float32, reflect.Float64: - return floatKind, nil - case reflect.Complex64, reflect.Complex128: - return complexKind, nil - case reflect.String: - return stringKind, nil - } - return invalidKind, errBadComparisonType -} - -// eq evaluates the comparison a == b || a == c || ... -func eq(arg1 interface{}, arg2 ...interface{}) (bool, error) { - v1 := reflect.ValueOf(arg1) - k1, err := basicKind(v1) - if err != nil { - return false, err - } - if len(arg2) == 0 { - return false, errNoComparison - } - for _, arg := range arg2 { - v2 := reflect.ValueOf(arg) - k2, err := basicKind(v2) - if err != nil { - return false, err - } - truth := false - if k1 != k2 { - // Special case: Can compare integer values regardless of type's sign. - switch { - case k1 == intKind && k2 == uintKind: - truth = v1.Int() >= 0 && uint64(v1.Int()) == v2.Uint() - case k1 == uintKind && k2 == intKind: - truth = v2.Int() >= 0 && v1.Uint() == uint64(v2.Int()) - default: - return false, errBadComparison - } - } else { - switch k1 { - case boolKind: - truth = v1.Bool() == v2.Bool() - case complexKind: - truth = v1.Complex() == v2.Complex() - case floatKind: - truth = v1.Float() == v2.Float() - case intKind: - truth = v1.Int() == v2.Int() - case stringKind: - truth = v1.String() == v2.String() - case uintKind: - truth = v1.Uint() == v2.Uint() - default: - panic("invalid kind") - } - } - if truth { - return true, nil - } - } - return false, nil -} - -// ne evaluates the comparison a != b. -func ne(arg1, arg2 interface{}) (bool, error) { - // != is the inverse of ==. - equal, err := eq(arg1, arg2) - return !equal, err -} - -// lt evaluates the comparison a < b. -func lt(arg1, arg2 interface{}) (bool, error) { - v1 := reflect.ValueOf(arg1) - k1, err := basicKind(v1) - if err != nil { - return false, err - } - v2 := reflect.ValueOf(arg2) - k2, err := basicKind(v2) - if err != nil { - return false, err - } - truth := false - if k1 != k2 { - // Special case: Can compare integer values regardless of type's sign. - switch { - case k1 == intKind && k2 == uintKind: - truth = v1.Int() < 0 || uint64(v1.Int()) < v2.Uint() - case k1 == uintKind && k2 == intKind: - truth = v2.Int() >= 0 && v1.Uint() < uint64(v2.Int()) - default: - return false, errBadComparison - } - } else { - switch k1 { - case boolKind, complexKind: - return false, errBadComparisonType - case floatKind: - truth = v1.Float() < v2.Float() - case intKind: - truth = v1.Int() < v2.Int() - case stringKind: - truth = v1.String() < v2.String() - case uintKind: - truth = v1.Uint() < v2.Uint() - default: - panic("invalid kind") - } - } - return truth, nil -} - -// le evaluates the comparison <= b. -func le(arg1, arg2 interface{}) (bool, error) { - // <= is < or ==. - lessThan, err := lt(arg1, arg2) - if lessThan || err != nil { - return lessThan, err - } - return eq(arg1, arg2) -} - -// gt evaluates the comparison a > b. -func gt(arg1, arg2 interface{}) (bool, error) { - // > is the inverse of <=. - lessOrEqual, err := le(arg1, arg2) - if err != nil { - return false, err - } - return !lessOrEqual, nil -} - -// ge evaluates the comparison a >= b. -func ge(arg1, arg2 interface{}) (bool, error) { - // >= is the inverse of <. - lessThan, err := lt(arg1, arg2) - if err != nil { - return false, err - } - return !lessThan, nil -} - -// HTML escaping. - -var ( - htmlQuot = []byte(""") // shorter than """ - htmlApos = []byte("'") // shorter than "'" and apos was not in HTML until HTML5 - htmlAmp = []byte("&") - htmlLt = []byte("<") - htmlGt = []byte(">") -) - -// HTMLEscape writes to w the escaped HTML equivalent of the plain text data b. -func HTMLEscape(w io.Writer, b []byte) { - last := 0 - for i, c := range b { - var html []byte - switch c { - case '"': - html = htmlQuot - case '\'': - html = htmlApos - case '&': - html = htmlAmp - case '<': - html = htmlLt - case '>': - html = htmlGt - default: - continue - } - w.Write(b[last:i]) - w.Write(html) - last = i + 1 - } - w.Write(b[last:]) -} - -// HTMLEscapeString returns the escaped HTML equivalent of the plain text data s. -func HTMLEscapeString(s string) string { - // Avoid allocation if we can. - if strings.IndexAny(s, `'"&<>`) < 0 { - return s - } - var b bytes.Buffer - HTMLEscape(&b, []byte(s)) - return b.String() -} - -// HTMLEscaper returns the escaped HTML equivalent of the textual -// representation of its arguments. -func HTMLEscaper(args ...interface{}) string { - return HTMLEscapeString(evalArgs(args)) -} - -// JavaScript escaping. - -var ( - jsLowUni = []byte(`\u00`) - hex = []byte("0123456789ABCDEF") - - jsBackslash = []byte(`\\`) - jsApos = []byte(`\'`) - jsQuot = []byte(`\"`) - jsLt = []byte(`\x3C`) - jsGt = []byte(`\x3E`) -) - -// JSEscape writes to w the escaped JavaScript equivalent of the plain text data b. -func JSEscape(w io.Writer, b []byte) { - last := 0 - for i := 0; i < len(b); i++ { - c := b[i] - - if !jsIsSpecial(rune(c)) { - // fast path: nothing to do - continue - } - w.Write(b[last:i]) - - if c < utf8.RuneSelf { - // Quotes, slashes and angle brackets get quoted. - // Control characters get written as \u00XX. - switch c { - case '\\': - w.Write(jsBackslash) - case '\'': - w.Write(jsApos) - case '"': - w.Write(jsQuot) - case '<': - w.Write(jsLt) - case '>': - w.Write(jsGt) - default: - w.Write(jsLowUni) - t, b := c>>4, c&0x0f - w.Write(hex[t : t+1]) - w.Write(hex[b : b+1]) - } - } else { - // Unicode rune. - r, size := utf8.DecodeRune(b[i:]) - if unicode.IsPrint(r) { - w.Write(b[i : i+size]) - } else { - fmt.Fprintf(w, "\\u%04X", r) - } - i += size - 1 - } - last = i + 1 - } - w.Write(b[last:]) -} - -// JSEscapeString returns the escaped JavaScript equivalent of the plain text data s. -func JSEscapeString(s string) string { - // Avoid allocation if we can. - if strings.IndexFunc(s, jsIsSpecial) < 0 { - return s - } - var b bytes.Buffer - JSEscape(&b, []byte(s)) - return b.String() -} - -func jsIsSpecial(r rune) bool { - switch r { - case '\\', '\'', '"', '<', '>': - return true - } - return r < ' ' || utf8.RuneSelf <= r -} - -// JSEscaper returns the escaped JavaScript equivalent of the textual -// representation of its arguments. -func JSEscaper(args ...interface{}) string { - return JSEscapeString(evalArgs(args)) -} - -// URLQueryEscaper returns the escaped value of the textual representation of -// its arguments in a form suitable for embedding in a URL query. -func URLQueryEscaper(args ...interface{}) string { - return url.QueryEscape(evalArgs(args)) -} - -// evalArgs formats the list of arguments into a string. It is therefore equivalent to -// fmt.Sprint(args...) -// except that each argument is indirected (if a pointer), as required, -// using the same rules as the default string evaluation during template -// execution. -func evalArgs(args []interface{}) string { - ok := false - var s string - // Fast path for simple common case. - if len(args) == 1 { - s, ok = args[0].(string) - } - if !ok { - for i, arg := range args { - a, ok := printableValue(reflect.ValueOf(arg)) - if ok { - args[i] = a - } // else left fmt do its thing - } - s = fmt.Sprint(args...) - } - return s -} diff --git a/vendor/github.com/alecthomas/template/helper.go b/vendor/github.com/alecthomas/template/helper.go deleted file mode 100644 index 3636fb54d..000000000 --- a/vendor/github.com/alecthomas/template/helper.go +++ /dev/null @@ -1,108 +0,0 @@ -// Copyright 2011 The Go Authors. All rights reserved. -// Use of this source code is governed by a BSD-style -// license that can be found in the LICENSE file. - -// Helper functions to make constructing templates easier. - -package template - -import ( - "fmt" - "io/ioutil" - "path/filepath" -) - -// Functions and methods to parse templates. - -// Must is a helper that wraps a call to a function returning (*Template, error) -// and panics if the error is non-nil. It is intended for use in variable -// initializations such as -// var t = template.Must(template.New("name").Parse("text")) -func Must(t *Template, err error) *Template { - if err != nil { - panic(err) - } - return t -} - -// ParseFiles creates a new Template and parses the template definitions from -// the named files. The returned template's name will have the (base) name and -// (parsed) contents of the first file. There must be at least one file. -// If an error occurs, parsing stops and the returned *Template is nil. -func ParseFiles(filenames ...string) (*Template, error) { - return parseFiles(nil, filenames...) -} - -// ParseFiles parses the named files and associates the resulting templates with -// t. If an error occurs, parsing stops and the returned template is nil; -// otherwise it is t. There must be at least one file. -func (t *Template) ParseFiles(filenames ...string) (*Template, error) { - return parseFiles(t, filenames...) -} - -// parseFiles is the helper for the method and function. If the argument -// template is nil, it is created from the first file. -func parseFiles(t *Template, filenames ...string) (*Template, error) { - if len(filenames) == 0 { - // Not really a problem, but be consistent. - return nil, fmt.Errorf("template: no files named in call to ParseFiles") - } - for _, filename := range filenames { - b, err := ioutil.ReadFile(filename) - if err != nil { - return nil, err - } - s := string(b) - name := filepath.Base(filename) - // First template becomes return value if not already defined, - // and we use that one for subsequent New calls to associate - // all the templates together. Also, if this file has the same name - // as t, this file becomes the contents of t, so - // t, err := New(name).Funcs(xxx).ParseFiles(name) - // works. Otherwise we create a new template associated with t. - var tmpl *Template - if t == nil { - t = New(name) - } - if name == t.Name() { - tmpl = t - } else { - tmpl = t.New(name) - } - _, err = tmpl.Parse(s) - if err != nil { - return nil, err - } - } - return t, nil -} - -// ParseGlob creates a new Template and parses the template definitions from the -// files identified by the pattern, which must match at least one file. The -// returned template will have the (base) name and (parsed) contents of the -// first file matched by the pattern. ParseGlob is equivalent to calling -// ParseFiles with the list of files matched by the pattern. -func ParseGlob(pattern string) (*Template, error) { - return parseGlob(nil, pattern) -} - -// ParseGlob parses the template definitions in the files identified by the -// pattern and associates the resulting templates with t. The pattern is -// processed by filepath.Glob and must match at least one file. ParseGlob is -// equivalent to calling t.ParseFiles with the list of files matched by the -// pattern. -func (t *Template) ParseGlob(pattern string) (*Template, error) { - return parseGlob(t, pattern) -} - -// parseGlob is the implementation of the function and method ParseGlob. -func parseGlob(t *Template, pattern string) (*Template, error) { - filenames, err := filepath.Glob(pattern) - if err != nil { - return nil, err - } - if len(filenames) == 0 { - return nil, fmt.Errorf("template: pattern matches no files: %#q", pattern) - } - return parseFiles(t, filenames...) -} diff --git a/vendor/github.com/alecthomas/template/parse/lex.go b/vendor/github.com/alecthomas/template/parse/lex.go deleted file mode 100644 index 55f1c051e..000000000 --- a/vendor/github.com/alecthomas/template/parse/lex.go +++ /dev/null @@ -1,556 +0,0 @@ -// Copyright 2011 The Go Authors. All rights reserved. -// Use of this source code is governed by a BSD-style -// license that can be found in the LICENSE file. - -package parse - -import ( - "fmt" - "strings" - "unicode" - "unicode/utf8" -) - -// item represents a token or text string returned from the scanner. -type item struct { - typ itemType // The type of this item. - pos Pos // The starting position, in bytes, of this item in the input string. - val string // The value of this item. -} - -func (i item) String() string { - switch { - case i.typ == itemEOF: - return "EOF" - case i.typ == itemError: - return i.val - case i.typ > itemKeyword: - return fmt.Sprintf("<%s>", i.val) - case len(i.val) > 10: - return fmt.Sprintf("%.10q...", i.val) - } - return fmt.Sprintf("%q", i.val) -} - -// itemType identifies the type of lex items. -type itemType int - -const ( - itemError itemType = iota // error occurred; value is text of error - itemBool // boolean constant - itemChar // printable ASCII character; grab bag for comma etc. - itemCharConstant // character constant - itemComplex // complex constant (1+2i); imaginary is just a number - itemColonEquals // colon-equals (':=') introducing a declaration - itemEOF - itemField // alphanumeric identifier starting with '.' - itemIdentifier // alphanumeric identifier not starting with '.' - itemLeftDelim // left action delimiter - itemLeftParen // '(' inside action - itemNumber // simple number, including imaginary - itemPipe // pipe symbol - itemRawString // raw quoted string (includes quotes) - itemRightDelim // right action delimiter - itemElideNewline // elide newline after right delim - itemRightParen // ')' inside action - itemSpace // run of spaces separating arguments - itemString // quoted string (includes quotes) - itemText // plain text - itemVariable // variable starting with '$', such as '$' or '$1' or '$hello' - // Keywords appear after all the rest. - itemKeyword // used only to delimit the keywords - itemDot // the cursor, spelled '.' - itemDefine // define keyword - itemElse // else keyword - itemEnd // end keyword - itemIf // if keyword - itemNil // the untyped nil constant, easiest to treat as a keyword - itemRange // range keyword - itemTemplate // template keyword - itemWith // with keyword -) - -var key = map[string]itemType{ - ".": itemDot, - "define": itemDefine, - "else": itemElse, - "end": itemEnd, - "if": itemIf, - "range": itemRange, - "nil": itemNil, - "template": itemTemplate, - "with": itemWith, -} - -const eof = -1 - -// stateFn represents the state of the scanner as a function that returns the next state. -type stateFn func(*lexer) stateFn - -// lexer holds the state of the scanner. -type lexer struct { - name string // the name of the input; used only for error reports - input string // the string being scanned - leftDelim string // start of action - rightDelim string // end of action - state stateFn // the next lexing function to enter - pos Pos // current position in the input - start Pos // start position of this item - width Pos // width of last rune read from input - lastPos Pos // position of most recent item returned by nextItem - items chan item // channel of scanned items - parenDepth int // nesting depth of ( ) exprs -} - -// next returns the next rune in the input. -func (l *lexer) next() rune { - if int(l.pos) >= len(l.input) { - l.width = 0 - return eof - } - r, w := utf8.DecodeRuneInString(l.input[l.pos:]) - l.width = Pos(w) - l.pos += l.width - return r -} - -// peek returns but does not consume the next rune in the input. -func (l *lexer) peek() rune { - r := l.next() - l.backup() - return r -} - -// backup steps back one rune. Can only be called once per call of next. -func (l *lexer) backup() { - l.pos -= l.width -} - -// emit passes an item back to the client. -func (l *lexer) emit(t itemType) { - l.items <- item{t, l.start, l.input[l.start:l.pos]} - l.start = l.pos -} - -// ignore skips over the pending input before this point. -func (l *lexer) ignore() { - l.start = l.pos -} - -// accept consumes the next rune if it's from the valid set. -func (l *lexer) accept(valid string) bool { - if strings.IndexRune(valid, l.next()) >= 0 { - return true - } - l.backup() - return false -} - -// acceptRun consumes a run of runes from the valid set. -func (l *lexer) acceptRun(valid string) { - for strings.IndexRune(valid, l.next()) >= 0 { - } - l.backup() -} - -// lineNumber reports which line we're on, based on the position of -// the previous item returned by nextItem. Doing it this way -// means we don't have to worry about peek double counting. -func (l *lexer) lineNumber() int { - return 1 + strings.Count(l.input[:l.lastPos], "\n") -} - -// errorf returns an error token and terminates the scan by passing -// back a nil pointer that will be the next state, terminating l.nextItem. -func (l *lexer) errorf(format string, args ...interface{}) stateFn { - l.items <- item{itemError, l.start, fmt.Sprintf(format, args...)} - return nil -} - -// nextItem returns the next item from the input. -func (l *lexer) nextItem() item { - item := <-l.items - l.lastPos = item.pos - return item -} - -// lex creates a new scanner for the input string. -func lex(name, input, left, right string) *lexer { - if left == "" { - left = leftDelim - } - if right == "" { - right = rightDelim - } - l := &lexer{ - name: name, - input: input, - leftDelim: left, - rightDelim: right, - items: make(chan item), - } - go l.run() - return l -} - -// run runs the state machine for the lexer. -func (l *lexer) run() { - for l.state = lexText; l.state != nil; { - l.state = l.state(l) - } -} - -// state functions - -const ( - leftDelim = "{{" - rightDelim = "}}" - leftComment = "/*" - rightComment = "*/" -) - -// lexText scans until an opening action delimiter, "{{". -func lexText(l *lexer) stateFn { - for { - if strings.HasPrefix(l.input[l.pos:], l.leftDelim) { - if l.pos > l.start { - l.emit(itemText) - } - return lexLeftDelim - } - if l.next() == eof { - break - } - } - // Correctly reached EOF. - if l.pos > l.start { - l.emit(itemText) - } - l.emit(itemEOF) - return nil -} - -// lexLeftDelim scans the left delimiter, which is known to be present. -func lexLeftDelim(l *lexer) stateFn { - l.pos += Pos(len(l.leftDelim)) - if strings.HasPrefix(l.input[l.pos:], leftComment) { - return lexComment - } - l.emit(itemLeftDelim) - l.parenDepth = 0 - return lexInsideAction -} - -// lexComment scans a comment. The left comment marker is known to be present. -func lexComment(l *lexer) stateFn { - l.pos += Pos(len(leftComment)) - i := strings.Index(l.input[l.pos:], rightComment) - if i < 0 { - return l.errorf("unclosed comment") - } - l.pos += Pos(i + len(rightComment)) - if !strings.HasPrefix(l.input[l.pos:], l.rightDelim) { - return l.errorf("comment ends before closing delimiter") - - } - l.pos += Pos(len(l.rightDelim)) - l.ignore() - return lexText -} - -// lexRightDelim scans the right delimiter, which is known to be present. -func lexRightDelim(l *lexer) stateFn { - l.pos += Pos(len(l.rightDelim)) - l.emit(itemRightDelim) - if l.peek() == '\\' { - l.pos++ - l.emit(itemElideNewline) - } - return lexText -} - -// lexInsideAction scans the elements inside action delimiters. -func lexInsideAction(l *lexer) stateFn { - // Either number, quoted string, or identifier. - // Spaces separate arguments; runs of spaces turn into itemSpace. - // Pipe symbols separate and are emitted. - if strings.HasPrefix(l.input[l.pos:], l.rightDelim+"\\") || strings.HasPrefix(l.input[l.pos:], l.rightDelim) { - if l.parenDepth == 0 { - return lexRightDelim - } - return l.errorf("unclosed left paren") - } - switch r := l.next(); { - case r == eof || isEndOfLine(r): - return l.errorf("unclosed action") - case isSpace(r): - return lexSpace - case r == ':': - if l.next() != '=' { - return l.errorf("expected :=") - } - l.emit(itemColonEquals) - case r == '|': - l.emit(itemPipe) - case r == '"': - return lexQuote - case r == '`': - return lexRawQuote - case r == '$': - return lexVariable - case r == '\'': - return lexChar - case r == '.': - // special look-ahead for ".field" so we don't break l.backup(). - if l.pos < Pos(len(l.input)) { - r := l.input[l.pos] - if r < '0' || '9' < r { - return lexField - } - } - fallthrough // '.' can start a number. - case r == '+' || r == '-' || ('0' <= r && r <= '9'): - l.backup() - return lexNumber - case isAlphaNumeric(r): - l.backup() - return lexIdentifier - case r == '(': - l.emit(itemLeftParen) - l.parenDepth++ - return lexInsideAction - case r == ')': - l.emit(itemRightParen) - l.parenDepth-- - if l.parenDepth < 0 { - return l.errorf("unexpected right paren %#U", r) - } - return lexInsideAction - case r <= unicode.MaxASCII && unicode.IsPrint(r): - l.emit(itemChar) - return lexInsideAction - default: - return l.errorf("unrecognized character in action: %#U", r) - } - return lexInsideAction -} - -// lexSpace scans a run of space characters. -// One space has already been seen. -func lexSpace(l *lexer) stateFn { - for isSpace(l.peek()) { - l.next() - } - l.emit(itemSpace) - return lexInsideAction -} - -// lexIdentifier scans an alphanumeric. -func lexIdentifier(l *lexer) stateFn { -Loop: - for { - switch r := l.next(); { - case isAlphaNumeric(r): - // absorb. - default: - l.backup() - word := l.input[l.start:l.pos] - if !l.atTerminator() { - return l.errorf("bad character %#U", r) - } - switch { - case key[word] > itemKeyword: - l.emit(key[word]) - case word[0] == '.': - l.emit(itemField) - case word == "true", word == "false": - l.emit(itemBool) - default: - l.emit(itemIdentifier) - } - break Loop - } - } - return lexInsideAction -} - -// lexField scans a field: .Alphanumeric. -// The . has been scanned. -func lexField(l *lexer) stateFn { - return lexFieldOrVariable(l, itemField) -} - -// lexVariable scans a Variable: $Alphanumeric. -// The $ has been scanned. -func lexVariable(l *lexer) stateFn { - if l.atTerminator() { // Nothing interesting follows -> "$". - l.emit(itemVariable) - return lexInsideAction - } - return lexFieldOrVariable(l, itemVariable) -} - -// lexVariable scans a field or variable: [.$]Alphanumeric. -// The . or $ has been scanned. -func lexFieldOrVariable(l *lexer, typ itemType) stateFn { - if l.atTerminator() { // Nothing interesting follows -> "." or "$". - if typ == itemVariable { - l.emit(itemVariable) - } else { - l.emit(itemDot) - } - return lexInsideAction - } - var r rune - for { - r = l.next() - if !isAlphaNumeric(r) { - l.backup() - break - } - } - if !l.atTerminator() { - return l.errorf("bad character %#U", r) - } - l.emit(typ) - return lexInsideAction -} - -// atTerminator reports whether the input is at valid termination character to -// appear after an identifier. Breaks .X.Y into two pieces. Also catches cases -// like "$x+2" not being acceptable without a space, in case we decide one -// day to implement arithmetic. -func (l *lexer) atTerminator() bool { - r := l.peek() - if isSpace(r) || isEndOfLine(r) { - return true - } - switch r { - case eof, '.', ',', '|', ':', ')', '(': - return true - } - // Does r start the delimiter? This can be ambiguous (with delim=="//", $x/2 will - // succeed but should fail) but only in extremely rare cases caused by willfully - // bad choice of delimiter. - if rd, _ := utf8.DecodeRuneInString(l.rightDelim); rd == r { - return true - } - return false -} - -// lexChar scans a character constant. The initial quote is already -// scanned. Syntax checking is done by the parser. -func lexChar(l *lexer) stateFn { -Loop: - for { - switch l.next() { - case '\\': - if r := l.next(); r != eof && r != '\n' { - break - } - fallthrough - case eof, '\n': - return l.errorf("unterminated character constant") - case '\'': - break Loop - } - } - l.emit(itemCharConstant) - return lexInsideAction -} - -// lexNumber scans a number: decimal, octal, hex, float, or imaginary. This -// isn't a perfect number scanner - for instance it accepts "." and "0x0.2" -// and "089" - but when it's wrong the input is invalid and the parser (via -// strconv) will notice. -func lexNumber(l *lexer) stateFn { - if !l.scanNumber() { - return l.errorf("bad number syntax: %q", l.input[l.start:l.pos]) - } - if sign := l.peek(); sign == '+' || sign == '-' { - // Complex: 1+2i. No spaces, must end in 'i'. - if !l.scanNumber() || l.input[l.pos-1] != 'i' { - return l.errorf("bad number syntax: %q", l.input[l.start:l.pos]) - } - l.emit(itemComplex) - } else { - l.emit(itemNumber) - } - return lexInsideAction -} - -func (l *lexer) scanNumber() bool { - // Optional leading sign. - l.accept("+-") - // Is it hex? - digits := "0123456789" - if l.accept("0") && l.accept("xX") { - digits = "0123456789abcdefABCDEF" - } - l.acceptRun(digits) - if l.accept(".") { - l.acceptRun(digits) - } - if l.accept("eE") { - l.accept("+-") - l.acceptRun("0123456789") - } - // Is it imaginary? - l.accept("i") - // Next thing mustn't be alphanumeric. - if isAlphaNumeric(l.peek()) { - l.next() - return false - } - return true -} - -// lexQuote scans a quoted string. -func lexQuote(l *lexer) stateFn { -Loop: - for { - switch l.next() { - case '\\': - if r := l.next(); r != eof && r != '\n' { - break - } - fallthrough - case eof, '\n': - return l.errorf("unterminated quoted string") - case '"': - break Loop - } - } - l.emit(itemString) - return lexInsideAction -} - -// lexRawQuote scans a raw quoted string. -func lexRawQuote(l *lexer) stateFn { -Loop: - for { - switch l.next() { - case eof, '\n': - return l.errorf("unterminated raw quoted string") - case '`': - break Loop - } - } - l.emit(itemRawString) - return lexInsideAction -} - -// isSpace reports whether r is a space character. -func isSpace(r rune) bool { - return r == ' ' || r == '\t' -} - -// isEndOfLine reports whether r is an end-of-line character. -func isEndOfLine(r rune) bool { - return r == '\r' || r == '\n' -} - -// isAlphaNumeric reports whether r is an alphabetic, digit, or underscore. -func isAlphaNumeric(r rune) bool { - return r == '_' || unicode.IsLetter(r) || unicode.IsDigit(r) -} diff --git a/vendor/github.com/alecthomas/template/parse/node.go b/vendor/github.com/alecthomas/template/parse/node.go deleted file mode 100644 index 55c37f6db..000000000 --- a/vendor/github.com/alecthomas/template/parse/node.go +++ /dev/null @@ -1,834 +0,0 @@ -// Copyright 2011 The Go Authors. All rights reserved. -// Use of this source code is governed by a BSD-style -// license that can be found in the LICENSE file. - -// Parse nodes. - -package parse - -import ( - "bytes" - "fmt" - "strconv" - "strings" -) - -var textFormat = "%s" // Changed to "%q" in tests for better error messages. - -// A Node is an element in the parse tree. The interface is trivial. -// The interface contains an unexported method so that only -// types local to this package can satisfy it. -type Node interface { - Type() NodeType - String() string - // Copy does a deep copy of the Node and all its components. - // To avoid type assertions, some XxxNodes also have specialized - // CopyXxx methods that return *XxxNode. - Copy() Node - Position() Pos // byte position of start of node in full original input string - // tree returns the containing *Tree. - // It is unexported so all implementations of Node are in this package. - tree() *Tree -} - -// NodeType identifies the type of a parse tree node. -type NodeType int - -// Pos represents a byte position in the original input text from which -// this template was parsed. -type Pos int - -func (p Pos) Position() Pos { - return p -} - -// Type returns itself and provides an easy default implementation -// for embedding in a Node. Embedded in all non-trivial Nodes. -func (t NodeType) Type() NodeType { - return t -} - -const ( - NodeText NodeType = iota // Plain text. - NodeAction // A non-control action such as a field evaluation. - NodeBool // A boolean constant. - NodeChain // A sequence of field accesses. - NodeCommand // An element of a pipeline. - NodeDot // The cursor, dot. - nodeElse // An else action. Not added to tree. - nodeEnd // An end action. Not added to tree. - NodeField // A field or method name. - NodeIdentifier // An identifier; always a function name. - NodeIf // An if action. - NodeList // A list of Nodes. - NodeNil // An untyped nil constant. - NodeNumber // A numerical constant. - NodePipe // A pipeline of commands. - NodeRange // A range action. - NodeString // A string constant. - NodeTemplate // A template invocation action. - NodeVariable // A $ variable. - NodeWith // A with action. -) - -// Nodes. - -// ListNode holds a sequence of nodes. -type ListNode struct { - NodeType - Pos - tr *Tree - Nodes []Node // The element nodes in lexical order. -} - -func (t *Tree) newList(pos Pos) *ListNode { - return &ListNode{tr: t, NodeType: NodeList, Pos: pos} -} - -func (l *ListNode) append(n Node) { - l.Nodes = append(l.Nodes, n) -} - -func (l *ListNode) tree() *Tree { - return l.tr -} - -func (l *ListNode) String() string { - b := new(bytes.Buffer) - for _, n := range l.Nodes { - fmt.Fprint(b, n) - } - return b.String() -} - -func (l *ListNode) CopyList() *ListNode { - if l == nil { - return l - } - n := l.tr.newList(l.Pos) - for _, elem := range l.Nodes { - n.append(elem.Copy()) - } - return n -} - -func (l *ListNode) Copy() Node { - return l.CopyList() -} - -// TextNode holds plain text. -type TextNode struct { - NodeType - Pos - tr *Tree - Text []byte // The text; may span newlines. -} - -func (t *Tree) newText(pos Pos, text string) *TextNode { - return &TextNode{tr: t, NodeType: NodeText, Pos: pos, Text: []byte(text)} -} - -func (t *TextNode) String() string { - return fmt.Sprintf(textFormat, t.Text) -} - -func (t *TextNode) tree() *Tree { - return t.tr -} - -func (t *TextNode) Copy() Node { - return &TextNode{tr: t.tr, NodeType: NodeText, Pos: t.Pos, Text: append([]byte{}, t.Text...)} -} - -// PipeNode holds a pipeline with optional declaration -type PipeNode struct { - NodeType - Pos - tr *Tree - Line int // The line number in the input (deprecated; kept for compatibility) - Decl []*VariableNode // Variable declarations in lexical order. - Cmds []*CommandNode // The commands in lexical order. -} - -func (t *Tree) newPipeline(pos Pos, line int, decl []*VariableNode) *PipeNode { - return &PipeNode{tr: t, NodeType: NodePipe, Pos: pos, Line: line, Decl: decl} -} - -func (p *PipeNode) append(command *CommandNode) { - p.Cmds = append(p.Cmds, command) -} - -func (p *PipeNode) String() string { - s := "" - if len(p.Decl) > 0 { - for i, v := range p.Decl { - if i > 0 { - s += ", " - } - s += v.String() - } - s += " := " - } - for i, c := range p.Cmds { - if i > 0 { - s += " | " - } - s += c.String() - } - return s -} - -func (p *PipeNode) tree() *Tree { - return p.tr -} - -func (p *PipeNode) CopyPipe() *PipeNode { - if p == nil { - return p - } - var decl []*VariableNode - for _, d := range p.Decl { - decl = append(decl, d.Copy().(*VariableNode)) - } - n := p.tr.newPipeline(p.Pos, p.Line, decl) - for _, c := range p.Cmds { - n.append(c.Copy().(*CommandNode)) - } - return n -} - -func (p *PipeNode) Copy() Node { - return p.CopyPipe() -} - -// ActionNode holds an action (something bounded by delimiters). -// Control actions have their own nodes; ActionNode represents simple -// ones such as field evaluations and parenthesized pipelines. -type ActionNode struct { - NodeType - Pos - tr *Tree - Line int // The line number in the input (deprecated; kept for compatibility) - Pipe *PipeNode // The pipeline in the action. -} - -func (t *Tree) newAction(pos Pos, line int, pipe *PipeNode) *ActionNode { - return &ActionNode{tr: t, NodeType: NodeAction, Pos: pos, Line: line, Pipe: pipe} -} - -func (a *ActionNode) String() string { - return fmt.Sprintf("{{%s}}", a.Pipe) - -} - -func (a *ActionNode) tree() *Tree { - return a.tr -} - -func (a *ActionNode) Copy() Node { - return a.tr.newAction(a.Pos, a.Line, a.Pipe.CopyPipe()) - -} - -// CommandNode holds a command (a pipeline inside an evaluating action). -type CommandNode struct { - NodeType - Pos - tr *Tree - Args []Node // Arguments in lexical order: Identifier, field, or constant. -} - -func (t *Tree) newCommand(pos Pos) *CommandNode { - return &CommandNode{tr: t, NodeType: NodeCommand, Pos: pos} -} - -func (c *CommandNode) append(arg Node) { - c.Args = append(c.Args, arg) -} - -func (c *CommandNode) String() string { - s := "" - for i, arg := range c.Args { - if i > 0 { - s += " " - } - if arg, ok := arg.(*PipeNode); ok { - s += "(" + arg.String() + ")" - continue - } - s += arg.String() - } - return s -} - -func (c *CommandNode) tree() *Tree { - return c.tr -} - -func (c *CommandNode) Copy() Node { - if c == nil { - return c - } - n := c.tr.newCommand(c.Pos) - for _, c := range c.Args { - n.append(c.Copy()) - } - return n -} - -// IdentifierNode holds an identifier. -type IdentifierNode struct { - NodeType - Pos - tr *Tree - Ident string // The identifier's name. -} - -// NewIdentifier returns a new IdentifierNode with the given identifier name. -func NewIdentifier(ident string) *IdentifierNode { - return &IdentifierNode{NodeType: NodeIdentifier, Ident: ident} -} - -// SetPos sets the position. NewIdentifier is a public method so we can't modify its signature. -// Chained for convenience. -// TODO: fix one day? -func (i *IdentifierNode) SetPos(pos Pos) *IdentifierNode { - i.Pos = pos - return i -} - -// SetTree sets the parent tree for the node. NewIdentifier is a public method so we can't modify its signature. -// Chained for convenience. -// TODO: fix one day? -func (i *IdentifierNode) SetTree(t *Tree) *IdentifierNode { - i.tr = t - return i -} - -func (i *IdentifierNode) String() string { - return i.Ident -} - -func (i *IdentifierNode) tree() *Tree { - return i.tr -} - -func (i *IdentifierNode) Copy() Node { - return NewIdentifier(i.Ident).SetTree(i.tr).SetPos(i.Pos) -} - -// VariableNode holds a list of variable names, possibly with chained field -// accesses. The dollar sign is part of the (first) name. -type VariableNode struct { - NodeType - Pos - tr *Tree - Ident []string // Variable name and fields in lexical order. -} - -func (t *Tree) newVariable(pos Pos, ident string) *VariableNode { - return &VariableNode{tr: t, NodeType: NodeVariable, Pos: pos, Ident: strings.Split(ident, ".")} -} - -func (v *VariableNode) String() string { - s := "" - for i, id := range v.Ident { - if i > 0 { - s += "." - } - s += id - } - return s -} - -func (v *VariableNode) tree() *Tree { - return v.tr -} - -func (v *VariableNode) Copy() Node { - return &VariableNode{tr: v.tr, NodeType: NodeVariable, Pos: v.Pos, Ident: append([]string{}, v.Ident...)} -} - -// DotNode holds the special identifier '.'. -type DotNode struct { - NodeType - Pos - tr *Tree -} - -func (t *Tree) newDot(pos Pos) *DotNode { - return &DotNode{tr: t, NodeType: NodeDot, Pos: pos} -} - -func (d *DotNode) Type() NodeType { - // Override method on embedded NodeType for API compatibility. - // TODO: Not really a problem; could change API without effect but - // api tool complains. - return NodeDot -} - -func (d *DotNode) String() string { - return "." -} - -func (d *DotNode) tree() *Tree { - return d.tr -} - -func (d *DotNode) Copy() Node { - return d.tr.newDot(d.Pos) -} - -// NilNode holds the special identifier 'nil' representing an untyped nil constant. -type NilNode struct { - NodeType - Pos - tr *Tree -} - -func (t *Tree) newNil(pos Pos) *NilNode { - return &NilNode{tr: t, NodeType: NodeNil, Pos: pos} -} - -func (n *NilNode) Type() NodeType { - // Override method on embedded NodeType for API compatibility. - // TODO: Not really a problem; could change API without effect but - // api tool complains. - return NodeNil -} - -func (n *NilNode) String() string { - return "nil" -} - -func (n *NilNode) tree() *Tree { - return n.tr -} - -func (n *NilNode) Copy() Node { - return n.tr.newNil(n.Pos) -} - -// FieldNode holds a field (identifier starting with '.'). -// The names may be chained ('.x.y'). -// The period is dropped from each ident. -type FieldNode struct { - NodeType - Pos - tr *Tree - Ident []string // The identifiers in lexical order. -} - -func (t *Tree) newField(pos Pos, ident string) *FieldNode { - return &FieldNode{tr: t, NodeType: NodeField, Pos: pos, Ident: strings.Split(ident[1:], ".")} // [1:] to drop leading period -} - -func (f *FieldNode) String() string { - s := "" - for _, id := range f.Ident { - s += "." + id - } - return s -} - -func (f *FieldNode) tree() *Tree { - return f.tr -} - -func (f *FieldNode) Copy() Node { - return &FieldNode{tr: f.tr, NodeType: NodeField, Pos: f.Pos, Ident: append([]string{}, f.Ident...)} -} - -// ChainNode holds a term followed by a chain of field accesses (identifier starting with '.'). -// The names may be chained ('.x.y'). -// The periods are dropped from each ident. -type ChainNode struct { - NodeType - Pos - tr *Tree - Node Node - Field []string // The identifiers in lexical order. -} - -func (t *Tree) newChain(pos Pos, node Node) *ChainNode { - return &ChainNode{tr: t, NodeType: NodeChain, Pos: pos, Node: node} -} - -// Add adds the named field (which should start with a period) to the end of the chain. -func (c *ChainNode) Add(field string) { - if len(field) == 0 || field[0] != '.' { - panic("no dot in field") - } - field = field[1:] // Remove leading dot. - if field == "" { - panic("empty field") - } - c.Field = append(c.Field, field) -} - -func (c *ChainNode) String() string { - s := c.Node.String() - if _, ok := c.Node.(*PipeNode); ok { - s = "(" + s + ")" - } - for _, field := range c.Field { - s += "." + field - } - return s -} - -func (c *ChainNode) tree() *Tree { - return c.tr -} - -func (c *ChainNode) Copy() Node { - return &ChainNode{tr: c.tr, NodeType: NodeChain, Pos: c.Pos, Node: c.Node, Field: append([]string{}, c.Field...)} -} - -// BoolNode holds a boolean constant. -type BoolNode struct { - NodeType - Pos - tr *Tree - True bool // The value of the boolean constant. -} - -func (t *Tree) newBool(pos Pos, true bool) *BoolNode { - return &BoolNode{tr: t, NodeType: NodeBool, Pos: pos, True: true} -} - -func (b *BoolNode) String() string { - if b.True { - return "true" - } - return "false" -} - -func (b *BoolNode) tree() *Tree { - return b.tr -} - -func (b *BoolNode) Copy() Node { - return b.tr.newBool(b.Pos, b.True) -} - -// NumberNode holds a number: signed or unsigned integer, float, or complex. -// The value is parsed and stored under all the types that can represent the value. -// This simulates in a small amount of code the behavior of Go's ideal constants. -type NumberNode struct { - NodeType - Pos - tr *Tree - IsInt bool // Number has an integral value. - IsUint bool // Number has an unsigned integral value. - IsFloat bool // Number has a floating-point value. - IsComplex bool // Number is complex. - Int64 int64 // The signed integer value. - Uint64 uint64 // The unsigned integer value. - Float64 float64 // The floating-point value. - Complex128 complex128 // The complex value. - Text string // The original textual representation from the input. -} - -func (t *Tree) newNumber(pos Pos, text string, typ itemType) (*NumberNode, error) { - n := &NumberNode{tr: t, NodeType: NodeNumber, Pos: pos, Text: text} - switch typ { - case itemCharConstant: - rune, _, tail, err := strconv.UnquoteChar(text[1:], text[0]) - if err != nil { - return nil, err - } - if tail != "'" { - return nil, fmt.Errorf("malformed character constant: %s", text) - } - n.Int64 = int64(rune) - n.IsInt = true - n.Uint64 = uint64(rune) - n.IsUint = true - n.Float64 = float64(rune) // odd but those are the rules. - n.IsFloat = true - return n, nil - case itemComplex: - // fmt.Sscan can parse the pair, so let it do the work. - if _, err := fmt.Sscan(text, &n.Complex128); err != nil { - return nil, err - } - n.IsComplex = true - n.simplifyComplex() - return n, nil - } - // Imaginary constants can only be complex unless they are zero. - if len(text) > 0 && text[len(text)-1] == 'i' { - f, err := strconv.ParseFloat(text[:len(text)-1], 64) - if err == nil { - n.IsComplex = true - n.Complex128 = complex(0, f) - n.simplifyComplex() - return n, nil - } - } - // Do integer test first so we get 0x123 etc. - u, err := strconv.ParseUint(text, 0, 64) // will fail for -0; fixed below. - if err == nil { - n.IsUint = true - n.Uint64 = u - } - i, err := strconv.ParseInt(text, 0, 64) - if err == nil { - n.IsInt = true - n.Int64 = i - if i == 0 { - n.IsUint = true // in case of -0. - n.Uint64 = u - } - } - // If an integer extraction succeeded, promote the float. - if n.IsInt { - n.IsFloat = true - n.Float64 = float64(n.Int64) - } else if n.IsUint { - n.IsFloat = true - n.Float64 = float64(n.Uint64) - } else { - f, err := strconv.ParseFloat(text, 64) - if err == nil { - n.IsFloat = true - n.Float64 = f - // If a floating-point extraction succeeded, extract the int if needed. - if !n.IsInt && float64(int64(f)) == f { - n.IsInt = true - n.Int64 = int64(f) - } - if !n.IsUint && float64(uint64(f)) == f { - n.IsUint = true - n.Uint64 = uint64(f) - } - } - } - if !n.IsInt && !n.IsUint && !n.IsFloat { - return nil, fmt.Errorf("illegal number syntax: %q", text) - } - return n, nil -} - -// simplifyComplex pulls out any other types that are represented by the complex number. -// These all require that the imaginary part be zero. -func (n *NumberNode) simplifyComplex() { - n.IsFloat = imag(n.Complex128) == 0 - if n.IsFloat { - n.Float64 = real(n.Complex128) - n.IsInt = float64(int64(n.Float64)) == n.Float64 - if n.IsInt { - n.Int64 = int64(n.Float64) - } - n.IsUint = float64(uint64(n.Float64)) == n.Float64 - if n.IsUint { - n.Uint64 = uint64(n.Float64) - } - } -} - -func (n *NumberNode) String() string { - return n.Text -} - -func (n *NumberNode) tree() *Tree { - return n.tr -} - -func (n *NumberNode) Copy() Node { - nn := new(NumberNode) - *nn = *n // Easy, fast, correct. - return nn -} - -// StringNode holds a string constant. The value has been "unquoted". -type StringNode struct { - NodeType - Pos - tr *Tree - Quoted string // The original text of the string, with quotes. - Text string // The string, after quote processing. -} - -func (t *Tree) newString(pos Pos, orig, text string) *StringNode { - return &StringNode{tr: t, NodeType: NodeString, Pos: pos, Quoted: orig, Text: text} -} - -func (s *StringNode) String() string { - return s.Quoted -} - -func (s *StringNode) tree() *Tree { - return s.tr -} - -func (s *StringNode) Copy() Node { - return s.tr.newString(s.Pos, s.Quoted, s.Text) -} - -// endNode represents an {{end}} action. -// It does not appear in the final parse tree. -type endNode struct { - NodeType - Pos - tr *Tree -} - -func (t *Tree) newEnd(pos Pos) *endNode { - return &endNode{tr: t, NodeType: nodeEnd, Pos: pos} -} - -func (e *endNode) String() string { - return "{{end}}" -} - -func (e *endNode) tree() *Tree { - return e.tr -} - -func (e *endNode) Copy() Node { - return e.tr.newEnd(e.Pos) -} - -// elseNode represents an {{else}} action. Does not appear in the final tree. -type elseNode struct { - NodeType - Pos - tr *Tree - Line int // The line number in the input (deprecated; kept for compatibility) -} - -func (t *Tree) newElse(pos Pos, line int) *elseNode { - return &elseNode{tr: t, NodeType: nodeElse, Pos: pos, Line: line} -} - -func (e *elseNode) Type() NodeType { - return nodeElse -} - -func (e *elseNode) String() string { - return "{{else}}" -} - -func (e *elseNode) tree() *Tree { - return e.tr -} - -func (e *elseNode) Copy() Node { - return e.tr.newElse(e.Pos, e.Line) -} - -// BranchNode is the common representation of if, range, and with. -type BranchNode struct { - NodeType - Pos - tr *Tree - Line int // The line number in the input (deprecated; kept for compatibility) - Pipe *PipeNode // The pipeline to be evaluated. - List *ListNode // What to execute if the value is non-empty. - ElseList *ListNode // What to execute if the value is empty (nil if absent). -} - -func (b *BranchNode) String() string { - name := "" - switch b.NodeType { - case NodeIf: - name = "if" - case NodeRange: - name = "range" - case NodeWith: - name = "with" - default: - panic("unknown branch type") - } - if b.ElseList != nil { - return fmt.Sprintf("{{%s %s}}%s{{else}}%s{{end}}", name, b.Pipe, b.List, b.ElseList) - } - return fmt.Sprintf("{{%s %s}}%s{{end}}", name, b.Pipe, b.List) -} - -func (b *BranchNode) tree() *Tree { - return b.tr -} - -func (b *BranchNode) Copy() Node { - switch b.NodeType { - case NodeIf: - return b.tr.newIf(b.Pos, b.Line, b.Pipe, b.List, b.ElseList) - case NodeRange: - return b.tr.newRange(b.Pos, b.Line, b.Pipe, b.List, b.ElseList) - case NodeWith: - return b.tr.newWith(b.Pos, b.Line, b.Pipe, b.List, b.ElseList) - default: - panic("unknown branch type") - } -} - -// IfNode represents an {{if}} action and its commands. -type IfNode struct { - BranchNode -} - -func (t *Tree) newIf(pos Pos, line int, pipe *PipeNode, list, elseList *ListNode) *IfNode { - return &IfNode{BranchNode{tr: t, NodeType: NodeIf, Pos: pos, Line: line, Pipe: pipe, List: list, ElseList: elseList}} -} - -func (i *IfNode) Copy() Node { - return i.tr.newIf(i.Pos, i.Line, i.Pipe.CopyPipe(), i.List.CopyList(), i.ElseList.CopyList()) -} - -// RangeNode represents a {{range}} action and its commands. -type RangeNode struct { - BranchNode -} - -func (t *Tree) newRange(pos Pos, line int, pipe *PipeNode, list, elseList *ListNode) *RangeNode { - return &RangeNode{BranchNode{tr: t, NodeType: NodeRange, Pos: pos, Line: line, Pipe: pipe, List: list, ElseList: elseList}} -} - -func (r *RangeNode) Copy() Node { - return r.tr.newRange(r.Pos, r.Line, r.Pipe.CopyPipe(), r.List.CopyList(), r.ElseList.CopyList()) -} - -// WithNode represents a {{with}} action and its commands. -type WithNode struct { - BranchNode -} - -func (t *Tree) newWith(pos Pos, line int, pipe *PipeNode, list, elseList *ListNode) *WithNode { - return &WithNode{BranchNode{tr: t, NodeType: NodeWith, Pos: pos, Line: line, Pipe: pipe, List: list, ElseList: elseList}} -} - -func (w *WithNode) Copy() Node { - return w.tr.newWith(w.Pos, w.Line, w.Pipe.CopyPipe(), w.List.CopyList(), w.ElseList.CopyList()) -} - -// TemplateNode represents a {{template}} action. -type TemplateNode struct { - NodeType - Pos - tr *Tree - Line int // The line number in the input (deprecated; kept for compatibility) - Name string // The name of the template (unquoted). - Pipe *PipeNode // The command to evaluate as dot for the template. -} - -func (t *Tree) newTemplate(pos Pos, line int, name string, pipe *PipeNode) *TemplateNode { - return &TemplateNode{tr: t, NodeType: NodeTemplate, Pos: pos, Line: line, Name: name, Pipe: pipe} -} - -func (t *TemplateNode) String() string { - if t.Pipe == nil { - return fmt.Sprintf("{{template %q}}", t.Name) - } - return fmt.Sprintf("{{template %q %s}}", t.Name, t.Pipe) -} - -func (t *TemplateNode) tree() *Tree { - return t.tr -} - -func (t *TemplateNode) Copy() Node { - return t.tr.newTemplate(t.Pos, t.Line, t.Name, t.Pipe.CopyPipe()) -} diff --git a/vendor/github.com/alecthomas/template/parse/parse.go b/vendor/github.com/alecthomas/template/parse/parse.go deleted file mode 100644 index 0d77ade87..000000000 --- a/vendor/github.com/alecthomas/template/parse/parse.go +++ /dev/null @@ -1,700 +0,0 @@ -// Copyright 2011 The Go Authors. All rights reserved. -// Use of this source code is governed by a BSD-style -// license that can be found in the LICENSE file. - -// Package parse builds parse trees for templates as defined by text/template -// and html/template. Clients should use those packages to construct templates -// rather than this one, which provides shared internal data structures not -// intended for general use. -package parse - -import ( - "bytes" - "fmt" - "runtime" - "strconv" - "strings" -) - -// Tree is the representation of a single parsed template. -type Tree struct { - Name string // name of the template represented by the tree. - ParseName string // name of the top-level template during parsing, for error messages. - Root *ListNode // top-level root of the tree. - text string // text parsed to create the template (or its parent) - // Parsing only; cleared after parse. - funcs []map[string]interface{} - lex *lexer - token [3]item // three-token lookahead for parser. - peekCount int - vars []string // variables defined at the moment. -} - -// Copy returns a copy of the Tree. Any parsing state is discarded. -func (t *Tree) Copy() *Tree { - if t == nil { - return nil - } - return &Tree{ - Name: t.Name, - ParseName: t.ParseName, - Root: t.Root.CopyList(), - text: t.text, - } -} - -// Parse returns a map from template name to parse.Tree, created by parsing the -// templates described in the argument string. The top-level template will be -// given the specified name. If an error is encountered, parsing stops and an -// empty map is returned with the error. -func Parse(name, text, leftDelim, rightDelim string, funcs ...map[string]interface{}) (treeSet map[string]*Tree, err error) { - treeSet = make(map[string]*Tree) - t := New(name) - t.text = text - _, err = t.Parse(text, leftDelim, rightDelim, treeSet, funcs...) - return -} - -// next returns the next token. -func (t *Tree) next() item { - if t.peekCount > 0 { - t.peekCount-- - } else { - t.token[0] = t.lex.nextItem() - } - return t.token[t.peekCount] -} - -// backup backs the input stream up one token. -func (t *Tree) backup() { - t.peekCount++ -} - -// backup2 backs the input stream up two tokens. -// The zeroth token is already there. -func (t *Tree) backup2(t1 item) { - t.token[1] = t1 - t.peekCount = 2 -} - -// backup3 backs the input stream up three tokens -// The zeroth token is already there. -func (t *Tree) backup3(t2, t1 item) { // Reverse order: we're pushing back. - t.token[1] = t1 - t.token[2] = t2 - t.peekCount = 3 -} - -// peek returns but does not consume the next token. -func (t *Tree) peek() item { - if t.peekCount > 0 { - return t.token[t.peekCount-1] - } - t.peekCount = 1 - t.token[0] = t.lex.nextItem() - return t.token[0] -} - -// nextNonSpace returns the next non-space token. -func (t *Tree) nextNonSpace() (token item) { - for { - token = t.next() - if token.typ != itemSpace { - break - } - } - return token -} - -// peekNonSpace returns but does not consume the next non-space token. -func (t *Tree) peekNonSpace() (token item) { - for { - token = t.next() - if token.typ != itemSpace { - break - } - } - t.backup() - return token -} - -// Parsing. - -// New allocates a new parse tree with the given name. -func New(name string, funcs ...map[string]interface{}) *Tree { - return &Tree{ - Name: name, - funcs: funcs, - } -} - -// ErrorContext returns a textual representation of the location of the node in the input text. -// The receiver is only used when the node does not have a pointer to the tree inside, -// which can occur in old code. -func (t *Tree) ErrorContext(n Node) (location, context string) { - pos := int(n.Position()) - tree := n.tree() - if tree == nil { - tree = t - } - text := tree.text[:pos] - byteNum := strings.LastIndex(text, "\n") - if byteNum == -1 { - byteNum = pos // On first line. - } else { - byteNum++ // After the newline. - byteNum = pos - byteNum - } - lineNum := 1 + strings.Count(text, "\n") - context = n.String() - if len(context) > 20 { - context = fmt.Sprintf("%.20s...", context) - } - return fmt.Sprintf("%s:%d:%d", tree.ParseName, lineNum, byteNum), context -} - -// errorf formats the error and terminates processing. -func (t *Tree) errorf(format string, args ...interface{}) { - t.Root = nil - format = fmt.Sprintf("template: %s:%d: %s", t.ParseName, t.lex.lineNumber(), format) - panic(fmt.Errorf(format, args...)) -} - -// error terminates processing. -func (t *Tree) error(err error) { - t.errorf("%s", err) -} - -// expect consumes the next token and guarantees it has the required type. -func (t *Tree) expect(expected itemType, context string) item { - token := t.nextNonSpace() - if token.typ != expected { - t.unexpected(token, context) - } - return token -} - -// expectOneOf consumes the next token and guarantees it has one of the required types. -func (t *Tree) expectOneOf(expected1, expected2 itemType, context string) item { - token := t.nextNonSpace() - if token.typ != expected1 && token.typ != expected2 { - t.unexpected(token, context) - } - return token -} - -// unexpected complains about the token and terminates processing. -func (t *Tree) unexpected(token item, context string) { - t.errorf("unexpected %s in %s", token, context) -} - -// recover is the handler that turns panics into returns from the top level of Parse. -func (t *Tree) recover(errp *error) { - e := recover() - if e != nil { - if _, ok := e.(runtime.Error); ok { - panic(e) - } - if t != nil { - t.stopParse() - } - *errp = e.(error) - } - return -} - -// startParse initializes the parser, using the lexer. -func (t *Tree) startParse(funcs []map[string]interface{}, lex *lexer) { - t.Root = nil - t.lex = lex - t.vars = []string{"$"} - t.funcs = funcs -} - -// stopParse terminates parsing. -func (t *Tree) stopParse() { - t.lex = nil - t.vars = nil - t.funcs = nil -} - -// Parse parses the template definition string to construct a representation of -// the template for execution. If either action delimiter string is empty, the -// default ("{{" or "}}") is used. Embedded template definitions are added to -// the treeSet map. -func (t *Tree) Parse(text, leftDelim, rightDelim string, treeSet map[string]*Tree, funcs ...map[string]interface{}) (tree *Tree, err error) { - defer t.recover(&err) - t.ParseName = t.Name - t.startParse(funcs, lex(t.Name, text, leftDelim, rightDelim)) - t.text = text - t.parse(treeSet) - t.add(treeSet) - t.stopParse() - return t, nil -} - -// add adds tree to the treeSet. -func (t *Tree) add(treeSet map[string]*Tree) { - tree := treeSet[t.Name] - if tree == nil || IsEmptyTree(tree.Root) { - treeSet[t.Name] = t - return - } - if !IsEmptyTree(t.Root) { - t.errorf("template: multiple definition of template %q", t.Name) - } -} - -// IsEmptyTree reports whether this tree (node) is empty of everything but space. -func IsEmptyTree(n Node) bool { - switch n := n.(type) { - case nil: - return true - case *ActionNode: - case *IfNode: - case *ListNode: - for _, node := range n.Nodes { - if !IsEmptyTree(node) { - return false - } - } - return true - case *RangeNode: - case *TemplateNode: - case *TextNode: - return len(bytes.TrimSpace(n.Text)) == 0 - case *WithNode: - default: - panic("unknown node: " + n.String()) - } - return false -} - -// parse is the top-level parser for a template, essentially the same -// as itemList except it also parses {{define}} actions. -// It runs to EOF. -func (t *Tree) parse(treeSet map[string]*Tree) (next Node) { - t.Root = t.newList(t.peek().pos) - for t.peek().typ != itemEOF { - if t.peek().typ == itemLeftDelim { - delim := t.next() - if t.nextNonSpace().typ == itemDefine { - newT := New("definition") // name will be updated once we know it. - newT.text = t.text - newT.ParseName = t.ParseName - newT.startParse(t.funcs, t.lex) - newT.parseDefinition(treeSet) - continue - } - t.backup2(delim) - } - n := t.textOrAction() - if n.Type() == nodeEnd { - t.errorf("unexpected %s", n) - } - t.Root.append(n) - } - return nil -} - -// parseDefinition parses a {{define}} ... {{end}} template definition and -// installs the definition in the treeSet map. The "define" keyword has already -// been scanned. -func (t *Tree) parseDefinition(treeSet map[string]*Tree) { - const context = "define clause" - name := t.expectOneOf(itemString, itemRawString, context) - var err error - t.Name, err = strconv.Unquote(name.val) - if err != nil { - t.error(err) - } - t.expect(itemRightDelim, context) - var end Node - t.Root, end = t.itemList() - if end.Type() != nodeEnd { - t.errorf("unexpected %s in %s", end, context) - } - t.add(treeSet) - t.stopParse() -} - -// itemList: -// textOrAction* -// Terminates at {{end}} or {{else}}, returned separately. -func (t *Tree) itemList() (list *ListNode, next Node) { - list = t.newList(t.peekNonSpace().pos) - for t.peekNonSpace().typ != itemEOF { - n := t.textOrAction() - switch n.Type() { - case nodeEnd, nodeElse: - return list, n - } - list.append(n) - } - t.errorf("unexpected EOF") - return -} - -// textOrAction: -// text | action -func (t *Tree) textOrAction() Node { - switch token := t.nextNonSpace(); token.typ { - case itemElideNewline: - return t.elideNewline() - case itemText: - return t.newText(token.pos, token.val) - case itemLeftDelim: - return t.action() - default: - t.unexpected(token, "input") - } - return nil -} - -// elideNewline: -// Remove newlines trailing rightDelim if \\ is present. -func (t *Tree) elideNewline() Node { - token := t.peek() - if token.typ != itemText { - t.unexpected(token, "input") - return nil - } - - t.next() - stripped := strings.TrimLeft(token.val, "\n\r") - diff := len(token.val) - len(stripped) - if diff > 0 { - // This is a bit nasty. We mutate the token in-place to remove - // preceding newlines. - token.pos += Pos(diff) - token.val = stripped - } - return t.newText(token.pos, token.val) -} - -// Action: -// control -// command ("|" command)* -// Left delim is past. Now get actions. -// First word could be a keyword such as range. -func (t *Tree) action() (n Node) { - switch token := t.nextNonSpace(); token.typ { - case itemElse: - return t.elseControl() - case itemEnd: - return t.endControl() - case itemIf: - return t.ifControl() - case itemRange: - return t.rangeControl() - case itemTemplate: - return t.templateControl() - case itemWith: - return t.withControl() - } - t.backup() - // Do not pop variables; they persist until "end". - return t.newAction(t.peek().pos, t.lex.lineNumber(), t.pipeline("command")) -} - -// Pipeline: -// declarations? command ('|' command)* -func (t *Tree) pipeline(context string) (pipe *PipeNode) { - var decl []*VariableNode - pos := t.peekNonSpace().pos - // Are there declarations? - for { - if v := t.peekNonSpace(); v.typ == itemVariable { - t.next() - // Since space is a token, we need 3-token look-ahead here in the worst case: - // in "$x foo" we need to read "foo" (as opposed to ":=") to know that $x is an - // argument variable rather than a declaration. So remember the token - // adjacent to the variable so we can push it back if necessary. - tokenAfterVariable := t.peek() - if next := t.peekNonSpace(); next.typ == itemColonEquals || (next.typ == itemChar && next.val == ",") { - t.nextNonSpace() - variable := t.newVariable(v.pos, v.val) - decl = append(decl, variable) - t.vars = append(t.vars, v.val) - if next.typ == itemChar && next.val == "," { - if context == "range" && len(decl) < 2 { - continue - } - t.errorf("too many declarations in %s", context) - } - } else if tokenAfterVariable.typ == itemSpace { - t.backup3(v, tokenAfterVariable) - } else { - t.backup2(v) - } - } - break - } - pipe = t.newPipeline(pos, t.lex.lineNumber(), decl) - for { - switch token := t.nextNonSpace(); token.typ { - case itemRightDelim, itemRightParen: - if len(pipe.Cmds) == 0 { - t.errorf("missing value for %s", context) - } - if token.typ == itemRightParen { - t.backup() - } - return - case itemBool, itemCharConstant, itemComplex, itemDot, itemField, itemIdentifier, - itemNumber, itemNil, itemRawString, itemString, itemVariable, itemLeftParen: - t.backup() - pipe.append(t.command()) - default: - t.unexpected(token, context) - } - } -} - -func (t *Tree) parseControl(allowElseIf bool, context string) (pos Pos, line int, pipe *PipeNode, list, elseList *ListNode) { - defer t.popVars(len(t.vars)) - line = t.lex.lineNumber() - pipe = t.pipeline(context) - var next Node - list, next = t.itemList() - switch next.Type() { - case nodeEnd: //done - case nodeElse: - if allowElseIf { - // Special case for "else if". If the "else" is followed immediately by an "if", - // the elseControl will have left the "if" token pending. Treat - // {{if a}}_{{else if b}}_{{end}} - // as - // {{if a}}_{{else}}{{if b}}_{{end}}{{end}}. - // To do this, parse the if as usual and stop at it {{end}}; the subsequent{{end}} - // is assumed. This technique works even for long if-else-if chains. - // TODO: Should we allow else-if in with and range? - if t.peek().typ == itemIf { - t.next() // Consume the "if" token. - elseList = t.newList(next.Position()) - elseList.append(t.ifControl()) - // Do not consume the next item - only one {{end}} required. - break - } - } - elseList, next = t.itemList() - if next.Type() != nodeEnd { - t.errorf("expected end; found %s", next) - } - } - return pipe.Position(), line, pipe, list, elseList -} - -// If: -// {{if pipeline}} itemList {{end}} -// {{if pipeline}} itemList {{else}} itemList {{end}} -// If keyword is past. -func (t *Tree) ifControl() Node { - return t.newIf(t.parseControl(true, "if")) -} - -// Range: -// {{range pipeline}} itemList {{end}} -// {{range pipeline}} itemList {{else}} itemList {{end}} -// Range keyword is past. -func (t *Tree) rangeControl() Node { - return t.newRange(t.parseControl(false, "range")) -} - -// With: -// {{with pipeline}} itemList {{end}} -// {{with pipeline}} itemList {{else}} itemList {{end}} -// If keyword is past. -func (t *Tree) withControl() Node { - return t.newWith(t.parseControl(false, "with")) -} - -// End: -// {{end}} -// End keyword is past. -func (t *Tree) endControl() Node { - return t.newEnd(t.expect(itemRightDelim, "end").pos) -} - -// Else: -// {{else}} -// Else keyword is past. -func (t *Tree) elseControl() Node { - // Special case for "else if". - peek := t.peekNonSpace() - if peek.typ == itemIf { - // We see "{{else if ... " but in effect rewrite it to {{else}}{{if ... ". - return t.newElse(peek.pos, t.lex.lineNumber()) - } - return t.newElse(t.expect(itemRightDelim, "else").pos, t.lex.lineNumber()) -} - -// Template: -// {{template stringValue pipeline}} -// Template keyword is past. The name must be something that can evaluate -// to a string. -func (t *Tree) templateControl() Node { - var name string - token := t.nextNonSpace() - switch token.typ { - case itemString, itemRawString: - s, err := strconv.Unquote(token.val) - if err != nil { - t.error(err) - } - name = s - default: - t.unexpected(token, "template invocation") - } - var pipe *PipeNode - if t.nextNonSpace().typ != itemRightDelim { - t.backup() - // Do not pop variables; they persist until "end". - pipe = t.pipeline("template") - } - return t.newTemplate(token.pos, t.lex.lineNumber(), name, pipe) -} - -// command: -// operand (space operand)* -// space-separated arguments up to a pipeline character or right delimiter. -// we consume the pipe character but leave the right delim to terminate the action. -func (t *Tree) command() *CommandNode { - cmd := t.newCommand(t.peekNonSpace().pos) - for { - t.peekNonSpace() // skip leading spaces. - operand := t.operand() - if operand != nil { - cmd.append(operand) - } - switch token := t.next(); token.typ { - case itemSpace: - continue - case itemError: - t.errorf("%s", token.val) - case itemRightDelim, itemRightParen: - t.backup() - case itemPipe: - default: - t.errorf("unexpected %s in operand; missing space?", token) - } - break - } - if len(cmd.Args) == 0 { - t.errorf("empty command") - } - return cmd -} - -// operand: -// term .Field* -// An operand is a space-separated component of a command, -// a term possibly followed by field accesses. -// A nil return means the next item is not an operand. -func (t *Tree) operand() Node { - node := t.term() - if node == nil { - return nil - } - if t.peek().typ == itemField { - chain := t.newChain(t.peek().pos, node) - for t.peek().typ == itemField { - chain.Add(t.next().val) - } - // Compatibility with original API: If the term is of type NodeField - // or NodeVariable, just put more fields on the original. - // Otherwise, keep the Chain node. - // TODO: Switch to Chains always when we can. - switch node.Type() { - case NodeField: - node = t.newField(chain.Position(), chain.String()) - case NodeVariable: - node = t.newVariable(chain.Position(), chain.String()) - default: - node = chain - } - } - return node -} - -// term: -// literal (number, string, nil, boolean) -// function (identifier) -// . -// .Field -// $ -// '(' pipeline ')' -// A term is a simple "expression". -// A nil return means the next item is not a term. -func (t *Tree) term() Node { - switch token := t.nextNonSpace(); token.typ { - case itemError: - t.errorf("%s", token.val) - case itemIdentifier: - if !t.hasFunction(token.val) { - t.errorf("function %q not defined", token.val) - } - return NewIdentifier(token.val).SetTree(t).SetPos(token.pos) - case itemDot: - return t.newDot(token.pos) - case itemNil: - return t.newNil(token.pos) - case itemVariable: - return t.useVar(token.pos, token.val) - case itemField: - return t.newField(token.pos, token.val) - case itemBool: - return t.newBool(token.pos, token.val == "true") - case itemCharConstant, itemComplex, itemNumber: - number, err := t.newNumber(token.pos, token.val, token.typ) - if err != nil { - t.error(err) - } - return number - case itemLeftParen: - pipe := t.pipeline("parenthesized pipeline") - if token := t.next(); token.typ != itemRightParen { - t.errorf("unclosed right paren: unexpected %s", token) - } - return pipe - case itemString, itemRawString: - s, err := strconv.Unquote(token.val) - if err != nil { - t.error(err) - } - return t.newString(token.pos, token.val, s) - } - t.backup() - return nil -} - -// hasFunction reports if a function name exists in the Tree's maps. -func (t *Tree) hasFunction(name string) bool { - for _, funcMap := range t.funcs { - if funcMap == nil { - continue - } - if funcMap[name] != nil { - return true - } - } - return false -} - -// popVars trims the variable list to the specified length -func (t *Tree) popVars(n int) { - t.vars = t.vars[:n] -} - -// useVar returns a node for a variable reference. It errors if the -// variable is not defined. -func (t *Tree) useVar(pos Pos, name string) Node { - v := t.newVariable(pos, name) - for _, varName := range t.vars { - if varName == v.Ident[0] { - return v - } - } - t.errorf("undefined variable %q", v.Ident[0]) - return nil -} diff --git a/vendor/github.com/alecthomas/template/template.go b/vendor/github.com/alecthomas/template/template.go deleted file mode 100644 index 447ed2aba..000000000 --- a/vendor/github.com/alecthomas/template/template.go +++ /dev/null @@ -1,218 +0,0 @@ -// Copyright 2011 The Go Authors. All rights reserved. -// Use of this source code is governed by a BSD-style -// license that can be found in the LICENSE file. - -package template - -import ( - "fmt" - "reflect" - - "github.com/alecthomas/template/parse" -) - -// common holds the information shared by related templates. -type common struct { - tmpl map[string]*Template - // We use two maps, one for parsing and one for execution. - // This separation makes the API cleaner since it doesn't - // expose reflection to the client. - parseFuncs FuncMap - execFuncs map[string]reflect.Value -} - -// Template is the representation of a parsed template. The *parse.Tree -// field is exported only for use by html/template and should be treated -// as unexported by all other clients. -type Template struct { - name string - *parse.Tree - *common - leftDelim string - rightDelim string -} - -// New allocates a new template with the given name. -func New(name string) *Template { - return &Template{ - name: name, - } -} - -// Name returns the name of the template. -func (t *Template) Name() string { - return t.name -} - -// New allocates a new template associated with the given one and with the same -// delimiters. The association, which is transitive, allows one template to -// invoke another with a {{template}} action. -func (t *Template) New(name string) *Template { - t.init() - return &Template{ - name: name, - common: t.common, - leftDelim: t.leftDelim, - rightDelim: t.rightDelim, - } -} - -func (t *Template) init() { - if t.common == nil { - t.common = new(common) - t.tmpl = make(map[string]*Template) - t.parseFuncs = make(FuncMap) - t.execFuncs = make(map[string]reflect.Value) - } -} - -// Clone returns a duplicate of the template, including all associated -// templates. The actual representation is not copied, but the name space of -// associated templates is, so further calls to Parse in the copy will add -// templates to the copy but not to the original. Clone can be used to prepare -// common templates and use them with variant definitions for other templates -// by adding the variants after the clone is made. -func (t *Template) Clone() (*Template, error) { - nt := t.copy(nil) - nt.init() - nt.tmpl[t.name] = nt - for k, v := range t.tmpl { - if k == t.name { // Already installed. - continue - } - // The associated templates share nt's common structure. - tmpl := v.copy(nt.common) - nt.tmpl[k] = tmpl - } - for k, v := range t.parseFuncs { - nt.parseFuncs[k] = v - } - for k, v := range t.execFuncs { - nt.execFuncs[k] = v - } - return nt, nil -} - -// copy returns a shallow copy of t, with common set to the argument. -func (t *Template) copy(c *common) *Template { - nt := New(t.name) - nt.Tree = t.Tree - nt.common = c - nt.leftDelim = t.leftDelim - nt.rightDelim = t.rightDelim - return nt -} - -// AddParseTree creates a new template with the name and parse tree -// and associates it with t. -func (t *Template) AddParseTree(name string, tree *parse.Tree) (*Template, error) { - if t.common != nil && t.tmpl[name] != nil { - return nil, fmt.Errorf("template: redefinition of template %q", name) - } - nt := t.New(name) - nt.Tree = tree - t.tmpl[name] = nt - return nt, nil -} - -// Templates returns a slice of the templates associated with t, including t -// itself. -func (t *Template) Templates() []*Template { - if t.common == nil { - return nil - } - // Return a slice so we don't expose the map. - m := make([]*Template, 0, len(t.tmpl)) - for _, v := range t.tmpl { - m = append(m, v) - } - return m -} - -// Delims sets the action delimiters to the specified strings, to be used in -// subsequent calls to Parse, ParseFiles, or ParseGlob. Nested template -// definitions will inherit the settings. An empty delimiter stands for the -// corresponding default: {{ or }}. -// The return value is the template, so calls can be chained. -func (t *Template) Delims(left, right string) *Template { - t.leftDelim = left - t.rightDelim = right - return t -} - -// Funcs adds the elements of the argument map to the template's function map. -// It panics if a value in the map is not a function with appropriate return -// type. However, it is legal to overwrite elements of the map. The return -// value is the template, so calls can be chained. -func (t *Template) Funcs(funcMap FuncMap) *Template { - t.init() - addValueFuncs(t.execFuncs, funcMap) - addFuncs(t.parseFuncs, funcMap) - return t -} - -// Lookup returns the template with the given name that is associated with t, -// or nil if there is no such template. -func (t *Template) Lookup(name string) *Template { - if t.common == nil { - return nil - } - return t.tmpl[name] -} - -// Parse parses a string into a template. Nested template definitions will be -// associated with the top-level template t. Parse may be called multiple times -// to parse definitions of templates to associate with t. It is an error if a -// resulting template is non-empty (contains content other than template -// definitions) and would replace a non-empty template with the same name. -// (In multiple calls to Parse with the same receiver template, only one call -// can contain text other than space, comments, and template definitions.) -func (t *Template) Parse(text string) (*Template, error) { - t.init() - trees, err := parse.Parse(t.name, text, t.leftDelim, t.rightDelim, t.parseFuncs, builtins) - if err != nil { - return nil, err - } - // Add the newly parsed trees, including the one for t, into our common structure. - for name, tree := range trees { - // If the name we parsed is the name of this template, overwrite this template. - // The associate method checks it's not a redefinition. - tmpl := t - if name != t.name { - tmpl = t.New(name) - } - // Even if t == tmpl, we need to install it in the common.tmpl map. - if replace, err := t.associate(tmpl, tree); err != nil { - return nil, err - } else if replace { - tmpl.Tree = tree - } - tmpl.leftDelim = t.leftDelim - tmpl.rightDelim = t.rightDelim - } - return t, nil -} - -// associate installs the new template into the group of templates associated -// with t. It is an error to reuse a name except to overwrite an empty -// template. The two are already known to share the common structure. -// The boolean return value reports wither to store this tree as t.Tree. -func (t *Template) associate(new *Template, tree *parse.Tree) (bool, error) { - if new.common != t.common { - panic("internal error: associate not common") - } - name := new.name - if old := t.tmpl[name]; old != nil { - oldIsEmpty := parse.IsEmptyTree(old.Root) - newIsEmpty := parse.IsEmptyTree(tree.Root) - if newIsEmpty { - // Whether old is empty or not, new is empty; no reason to replace old. - return false, nil - } - if !oldIsEmpty { - return false, fmt.Errorf("template: redefinition of template %q", name) - } - } - t.tmpl[name] = new - return true, nil -} -- cgit v1.2.3-1-g7c22