From 1e5c432e1029601a664454388ae366ef69618d62 Mon Sep 17 00:00:00 2001 From: Christopher Speller Date: Mon, 25 Jun 2018 12:33:13 -0700 Subject: MM-10702 Moving plugins to use hashicorp go-plugin. (#8978) * Moving plugins to use hashicorp go-plugin. * Tweaks from feedback. --- vendor/github.com/alecthomas/template/template.go | 218 ++++++++++++++++++++++ 1 file changed, 218 insertions(+) create mode 100644 vendor/github.com/alecthomas/template/template.go (limited to 'vendor/github.com/alecthomas/template/template.go') diff --git a/vendor/github.com/alecthomas/template/template.go b/vendor/github.com/alecthomas/template/template.go new file mode 100644 index 000000000..447ed2aba --- /dev/null +++ b/vendor/github.com/alecthomas/template/template.go @@ -0,0 +1,218 @@ +// 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