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124 lines
2.9 KiB
124 lines
2.9 KiB
package main
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import (
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"code.google.com/p/go.net/html"
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"code.google.com/p/go.net/html/atom"
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"fmt"
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"github.com/fatih/color"
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"github.com/mattn/go-colorable"
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"regexp"
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)
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var (
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// Colors
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tagColor *color.Color = color.New(color.FgYellow).Add(color.Bold)
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tokenColor = color.New(color.FgCyan).Add(color.Bold)
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attrKeyColor = color.New(color.FgRed)
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quoteColor = color.New(color.FgBlue)
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// Regexp helpers
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whitespaceRegexp *regexp.Regexp = regexp.MustCompile(`^\s*$`)
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preWhitespace = regexp.MustCompile(`^\s+`)
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postWhitespace = regexp.MustCompile(`\s+$`)
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)
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func init() {
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color.Output = colorable.NewColorableStdout()
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}
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// Is this node a tag with no end tag such as <meta> or <br>?
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// http://www.w3.org/TR/html-markup/syntax.html#syntax-elements
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func isVoidElement(n *html.Node) bool {
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switch n.DataAtom {
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case atom.Area, atom.Base, atom.Br, atom.Col, atom.Command, atom.Embed,
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atom.Hr, atom.Img, atom.Input, atom.Keygen, atom.Link,
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atom.Meta, atom.Param, atom.Source, atom.Track, atom.Wbr:
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return true
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}
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return false
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}
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type TreeDisplayer struct {
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IndentString string
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}
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func (t TreeDisplayer) Display(nodes []*html.Node) {
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for _, node := range nodes {
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t.printNode(node, 0)
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}
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}
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func (t TreeDisplayer) printChildren(n *html.Node, level int) {
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if maxPrintLevel > -1 {
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if level >= maxPrintLevel {
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t.printIndent(level)
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fmt.Println("...")
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return
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}
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}
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child := n.FirstChild
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for child != nil {
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t.printNode(child, level)
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child = child.NextSibling
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}
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}
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func (t TreeDisplayer) printIndent(level int) {
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for ; level > 0; level-- {
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fmt.Print(indentString)
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}
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}
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// Print a node and all of it's children to `maxlevel`.
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func (t TreeDisplayer) printNode(n *html.Node, level int) {
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switch n.Type {
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case html.TextNode:
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s := html.EscapeString(n.Data)
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if !whitespaceRegexp.MatchString(s) {
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s = preWhitespace.ReplaceAllString(s, "")
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s = postWhitespace.ReplaceAllString(s, "")
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t.printIndent(level)
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fmt.Println(s)
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}
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case html.ElementNode:
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t.printIndent(level)
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if printColor {
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tokenColor.Print("<")
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tagColor.Printf("%s", n.Data)
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} else {
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fmt.Printf("<%s", n.Data)
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}
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for _, a := range n.Attr {
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if printColor {
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fmt.Print(" ")
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attrKeyColor.Printf("%s", a.Key)
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tokenColor.Print("=")
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val := html.EscapeString(a.Val)
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quoteColor.Printf(`"%s"`, val)
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} else {
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val := html.EscapeString(a.Val)
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fmt.Printf(` %s="%s"`, a.Key, val)
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}
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}
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if printColor {
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tokenColor.Println(">")
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} else {
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fmt.Print(">\n")
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}
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if !isVoidElement(n) {
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t.printChildren(n, level+1)
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t.printIndent(level)
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if printColor {
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tokenColor.Print("</")
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tagColor.Printf("%s", n.Data)
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tokenColor.Println(">")
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} else {
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fmt.Printf("</%s>\n", n.Data)
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}
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}
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case html.CommentNode, html.DoctypeNode, html.DocumentNode:
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t.printChildren(n, level)
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}
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}
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