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template: fix and clean interaction between quotes and formatters

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Fixes issue #1897.

R=r, gustavo, r
CC=golang-dev
https://golang.org/cl/4561049
This commit is contained in:
Gustavo Niemeyer 2011-05-30 11:53:09 -03:00
parent 55f8fd2684
commit 87dbec54bb
2 changed files with 40 additions and 19 deletions
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47
src/pkg/template/template.go
View File

@ -491,20 +491,9 @@ func (t *Template) formatter(name string) func(io.Writer, string, ...interface{}
// -- Parsing
// Allocate a new variable-evaluation element.
// newVariable allocates a new variable-evaluation element.
func (t *Template) newVariable(words []string) *variableElement {
// After the final space-separated argument, formatters may be specified separated
// by pipe symbols, for example: {a b c|d|e}
// Until we learn otherwise, formatters contains a single name: "", the default formatter.
formatters := []string{""}
lastWord := words[len(words)-1]
bar := strings.IndexRune(lastWord, '|')
if bar >= 0 {
words[len(words)-1] = lastWord[0:bar]
formatters = strings.Split(lastWord[bar+1:], "|", -1)
}
formatters := extractFormatters(words)
args := make([]interface{}, len(words))
// Build argument list, processing any literals
@ -550,6 +539,38 @@ func (t *Template) newVariable(words []string) *variableElement {
return &variableElement{t.linenum, args, formatters}
}
// extractFormatters extracts a list of formatters from words.
// After the final space-separated argument in a variable, formatters may be
// specified separated by pipe symbols. For example: {a b c|d|e}
// The words parameter still has the formatters joined by '|' in the last word.
// extractFormatters splits formatters, replaces the last word with the content
// found before the first '|' within it, and returns the formatters obtained.
// If no formatters are found in words, the default formatter is returned.
func extractFormatters(words []string) (formatters []string) {
// "" is the default formatter.
formatters = []string{""}
if len(words) == 0 {
return
}
var bar int
lastWord := words[len(words)-1]
if isQuote(lastWord[0]) {
end := endQuote([]byte(lastWord), 0)
if end < 0 || end+1 == len(lastWord) || lastWord[end+1] != '|' {
return
}
bar = end + 1
} else {
bar = strings.IndexRune(lastWord, '|')
if bar < 0 {
return
}
}
words[len(words)-1] = lastWord[0:bar]
formatters = strings.Split(lastWord[bar+1:], "|", -1)
return
}
// Grab the next item. If it's simple, just append it to the template.
// Otherwise return its details.
func (t *Template) parseSimple(item []byte) (done bool, tok int, w []string) {

12
src/pkg/template/template_test.go
View File

@ -144,21 +144,21 @@ var tests = []*Test{
},
&Test{
in: `{"Strings" ":"} {""} {"\t\u0123 \x23\\"} {"\"}{\\"}`,
in: `{"Strings" ":"} {""} {"|"} {"\t\u0123 \x23\\"} {"\"}{\\"}`,
out: "Strings: \t\u0123 \x23\\ \"}{\\",
out: "Strings: | \t\u0123 \x23\\ \"}{\\",
},
&Test{
in: "{`Raw strings` `:`} {``} {`\\t\\u0123 \\x23\\`} {`}{\\`}",
in: "{`Raw strings` `:`} {``} {`|`} {`\\t\\u0123 \\x23\\`} {`}{\\`}",
out: "Raw strings: \\t\\u0123 \\x23\\ }{\\",
out: "Raw strings: | \\t\\u0123 \\x23\\ }{\\",
},
&Test{
in: "Characters: {'a'} {'\\u0123'} {' '} {'}'} {'{'}",
in: "Characters: {'a'} {'\\u0123'} {' '} {'{'} {'|'} {'}'}",
out: "Characters: 97 291 32 125 123",
out: "Characters: 97 291 32 123 124 125",
},
&Test{