forked from yosssi/gohtml
/
parser.go
82 lines (75 loc) · 2.25 KB
/
parser.go
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package gohtml
import (
"strings"
"code.google.com/p/go.net/html"
)
// parse parses a stirng and converts it into an html.
func parse(s string) *htmlDocument {
htmlDoc := &htmlDocument{}
tokenizer := html.NewTokenizer(strings.NewReader(s))
for {
if errorToken, _, _ := parseToken(tokenizer, htmlDoc, nil); errorToken {
break
}
}
return htmlDoc
}
func parseToken(tokenizer *html.Tokenizer, htmlDoc *htmlDocument, parent *tagElement) (bool, bool, string) {
tokenType := tokenizer.Next()
switch tokenType {
case html.ErrorToken:
return true, false, ""
case html.TextToken:
text := string(tokenizer.Text())
if strings.TrimSpace(text) == "" {
break
}
textElement := &textElement{text: text}
appendElement(htmlDoc, parent, textElement)
case html.StartTagToken:
tagElement := &tagElement{tagName: getTagName(tokenizer), startTagRaw: string(tokenizer.Raw())}
appendElement(htmlDoc, parent, tagElement)
for {
errorToken, parentEnded, unsetEndTag := parseToken(tokenizer, htmlDoc, tagElement)
if errorToken {
return true, false, ""
}
if parentEnded {
if unsetEndTag != "" {
return false, false, unsetEndTag
}
break
}
if unsetEndTag != "" {
return false, false, setEndTagRaw(tokenizer, tagElement, unsetEndTag)
}
}
case html.EndTagToken:
return false, true, setEndTagRaw(tokenizer, parent, getTagName(tokenizer))
case html.DoctypeToken, html.SelfClosingTagToken, html.CommentToken:
tagElement := &tagElement{tagName: getTagName(tokenizer), startTagRaw: string(tokenizer.Raw())}
appendElement(htmlDoc, parent, tagElement)
}
return false, false, ""
}
// appendElement appends the element to the htmlDocument or parent tagElement.
func appendElement(htmlDoc *htmlDocument, parent *tagElement, e element) {
if parent != nil {
parent.appendChild(e)
} else {
htmlDoc.append(e)
}
}
// getTagName gets a tagName from tokenizer.
func getTagName(tokenizer *html.Tokenizer) string {
tagName, _ := tokenizer.TagName()
return string(tagName)
}
// setEndTagRaw sets an endTagRaw to the parent.
func setEndTagRaw(tokenizer *html.Tokenizer, parent *tagElement, tagName string) string {
if parent != nil && parent.tagName == tagName {
parent.endTagRaw = string(tokenizer.Raw())
return ""
}
return tagName
}