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2.1 KiB
2.1 KiB
XML
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This package is an XML lexer written in Go. It follows the specification at Extensible Markup Language (XML) 1.0 (Fifth Edition). The lexer takes an io.Reader and converts it into tokens until the EOF.
Installation
Run the following command
go get github.com/tdewolff/parse/xml
or add the following import and run project with go get
import "github.com/tdewolff/parse/xml"
Lexer
Usage
The following initializes a new Lexer with io.Reader r
:
l := xml.NewLexer(r)
To tokenize until EOF an error, use:
for {
tt, data := l.Next()
switch tt {
case xml.ErrorToken:
// error or EOF set in l.Err()
return
case xml.StartTagToken:
// ...
for {
ttAttr, dataAttr := l.Next()
if ttAttr != xml.AttributeToken {
// handle StartTagCloseToken/StartTagCloseVoidToken/StartTagClosePIToken
break
}
// ...
}
case xml.EndTagToken:
// ...
}
}
All tokens:
ErrorToken TokenType = iota // extra token when errors occur
CommentToken
CDATAToken
StartTagToken
StartTagCloseToken
StartTagCloseVoidToken
StartTagClosePIToken
EndTagToken
AttributeToken
TextToken
Examples
package main
import (
"os"
"github.com/tdewolff/parse/xml"
)
// Tokenize XML from stdin.
func main() {
l := xml.NewLexer(os.Stdin)
for {
tt, data := l.Next()
switch tt {
case xml.ErrorToken:
if l.Err() != io.EOF {
fmt.Println("Error on line", l.Line(), ":", l.Err())
}
return
case xml.StartTagToken:
fmt.Println("Tag", string(data))
for {
ttAttr, dataAttr := l.Next()
if ttAttr != xml.AttributeToken {
break
}
key := dataAttr
val := l.AttrVal()
fmt.Println("Attribute", string(key), "=", string(val))
}
// ...
}
}
}
License
Released under the MIT license.