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package printer
import (
"bytes"
"errors"
"flag"
"fmt"
"io/ioutil"
"path/filepath"
"testing"
"github.com/hashicorp/hcl/hcl/parser"
)
var update = flag.Bool("update", false, "update golden files")
const (
dataDir = "testdata"
)
type entry struct {
source, golden string
}
// Use go test -update to create/update the respective golden files.
var data = []entry{
{"complexhcl.input", "complexhcl.golden"},
{"list.input", "list.golden"},
{"list_comment.input", "list_comment.golden"},
{"comment.input", "comment.golden"},
{"comment_crlf.input", "comment.golden"},
{"comment_aligned.input", "comment_aligned.golden"},
{"comment_array.input", "comment_array.golden"},
{"comment_end_file.input", "comment_end_file.golden"},
{"comment_multiline_indent.input", "comment_multiline_indent.golden"},
{"comment_multiline_no_stanza.input", "comment_multiline_no_stanza.golden"},
{"comment_multiline_stanza.input", "comment_multiline_stanza.golden"},
{"comment_newline.input", "comment_newline.golden"},
{"comment_object_multi.input", "comment_object_multi.golden"},
{"comment_standalone.input", "comment_standalone.golden"},
{"empty_block.input", "empty_block.golden"},
{"list_of_objects.input", "list_of_objects.golden"},
{"multiline_string.input", "multiline_string.golden"},
{"object_singleline.input", "object_singleline.golden"},
{"object_with_heredoc.input", "object_with_heredoc.golden"},
}
func TestFiles(t *testing.T) {
for _, e := range data {
source := filepath.Join(dataDir, e.source)
golden := filepath.Join(dataDir, e.golden)
t.Run(e.source, func(t *testing.T) {
check(t, source, golden)
})
}
}
func check(t *testing.T, source, golden string) {
src, err := ioutil.ReadFile(source)
if err != nil {
t.Error(err)
return
}
res, err := format(src)
if err != nil {
t.Error(err)
return
}
// update golden files if necessary
if *update {
if err := ioutil.WriteFile(golden, res, 0644); err != nil {
t.Error(err)
}
return
}
// get golden
gld, err := ioutil.ReadFile(golden)
if err != nil {
t.Error(err)
return
}
// formatted source and golden must be the same
if err := diff(source, golden, res, gld); err != nil {
t.Error(err)
return
}
}
// diff compares a and b.
func diff(aname, bname string, a, b []byte) error {
var buf bytes.Buffer // holding long error message
// compare lengths
if len(a) != len(b) {
fmt.Fprintf(&buf, "\nlength changed: len(%s) = %d, len(%s) = %d", aname, len(a), bname, len(b))
}
// compare contents
line := 1
offs := 1
for i := 0; i < len(a) && i < len(b); i++ {
ch := a[i]
if ch != b[i] {
fmt.Fprintf(&buf, "\n%s:%d:%d: %q", aname, line, i-offs+1, lineAt(a, offs))
fmt.Fprintf(&buf, "\n%s:%d:%d: %q", bname, line, i-offs+1, lineAt(b, offs))
fmt.Fprintf(&buf, "\n\n")
break
}
if ch == '\n' {
line++
offs = i + 1
}
}
if buf.Len() > 0 {
return errors.New(buf.String())
}
return nil
}
// format parses src, prints the corresponding AST, verifies the resulting
// src is syntactically correct, and returns the resulting src or an error
// if any.
func format(src []byte) ([]byte, error) {
formatted, err := Format(src)
if err != nil {
return nil, err
}
// make sure formatted output is syntactically correct
if _, err := parser.Parse(formatted); err != nil {
return nil, fmt.Errorf("parse: %s\n%s", err, formatted)
}
return formatted, nil
}
// lineAt returns the line in text starting at offset offs.
func lineAt(text []byte, offs int) []byte {
i := offs
for i < len(text) && text[i] != '\n' {
i++
}
return text[offs:i]
}
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