gosora/rev_templates.go

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//+build experiment
// ! EXPERIMENTAL
package main
import (
"errors"
"regexp"
)
var tagFinder *regexp.Regexp
func init() {
tagFinder = regexp.MustCompile(`(?s)\{\{(.*)\}\}`)
}
func icecreamSoup(tmpl string) error {
tagIndices := tagFinder.FindAllStringIndex(tmpl, -1)
if tagIndices != nil && len(tagIndices) > 0 {
if tagIndices[0][0] == 0 {
return errors.New("We don't support tags in the outermost layer yet")
}
for _, tagIndex := range tagIndices {
var nestingLayer = 0
for i := tagIndex[0]; i > 0; i-- {
switch tmpl[i] {
case '>':
i, closeTag, err := tasteTagToLeft(tmpl, i)
if err != nil {
return err
}
if closeTag {
nestingLayer++
}
case '<':
}
}
}
}
}
func tasteTagToLeft(tmpl string, index int) (indexOut int, closeTag bool, err error) {
var foundLeftBrace = false
for ; index > 0; index-- {
// What if the / isn't adjacent to the < but has a space instead? Is that even valid?
if index >= 1 && tmpl[index] == '/' && tmpl[index-1] == '<' {
closeTag = true
break
} else if tmpl[index] == '<' {
foundLeftBrace = true
}
}
if !foundLeftBrace {
return errors.New("The left portion of the tag is missing")
}
return index, closeTag, nil
}