Commit 64bbf8bc authored by Daniel Stender's avatar Daniel Stender

Imported Upstream version 0.0~git20140218.0.13f4951

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This diff is collapsed.
// Package xmlpath implements a strict subset of the XPath specification for the Go language.
//
// The XPath specification is available at:
//
// http://www.w3.org/TR/xpath
//
// Path expressions supported by this package are in the following format,
// with all components being optional:
//
// /axis-name::node-test[predicate]/axis-name::node-test[predicate]
//
// At the moment, xmlpath is compatible with the XPath specification
// to the following extent:
//
// - All axes are supported ("child", "following-sibling", etc)
// - All abbreviated forms are supported (".", "//", etc)
// - All node types except for namespace are supported
// - Predicates are restricted to [N], [path], and [path=literal] forms
// - Only a single predicate is supported per path step
// - Namespaces are experimentally supported
// - Richer expressions
//
// For example, assuming the following document:
//
// <library>
// <!-- Great book. -->
// <book id="b0836217462" available="true">
// <isbn>0836217462</isbn>
// <title lang="en">Being a Dog Is a Full-Time Job</title>
// <quote>I'd dog paddle the deepest ocean.</quote>
// <author id="CMS">
// <?echo "go rocks"?>
// <name>Charles M Schulz</name>
// <born>1922-11-26</born>
// <dead>2000-02-12</dead>
// </author>
// <character id="PP">
// <name>Peppermint Patty</name>
// <born>1966-08-22</born>
// <qualification>bold, brash and tomboyish</qualification>
// </character>
// <character id="Snoopy">
// <name>Snoopy</name>
// <born>1950-10-04</born>
// <qualification>extroverted beagle</qualification>
// </character>
// </book>
// </library>
//
// The following examples are valid path expressions, and the first
// match has the indicated value:
//
// /library/book/isbn => "0836217462"
// library/*/isbn => "0836217462"
// /library/book/../book/./isbn => "0836217462"
// /library/book/character[2]/name => "Snoopy"
// /library/book/character[born='1950-10-04']/name => "Snoopy"
// /library/book//node()[@id='PP']/name => "Peppermint Patty"
// //book[author/@id='CMS']/title => "Being a Dog Is a Full-Time Job"},
// /library/book/preceding::comment() => " Great book. "
//
// To run an expression, compile it, and then apply the compiled path to any
// number of context nodes, from one or more parsed xml documents:
//
// path := xmlpath.MustCompile("/library/book/isbn")
// root, err := xmlpath.Parse(file)
// if err != nil {
// log.Fatal(err)
// }
// if value, ok := path.String(root); ok {
// fmt.Println("Found:", value)
// }
//
// To use xmlpath with namespaces, it is required to give the supported set of namespace
// when compiling:
//
//
// var namespaces = []xmlpath.Namespace {
// { "s", "http://www.w3.org/2003/05/soap-envelope" },
// { "a", "http://schemas.xmlsoap.org/ws/2004/08/addressing" },
// }
// path, err := xmlpath.CompileWithNamespace("/s:Header/a:To", namespaces)
// if err != nil {
// log.Fatal(err)
// }
// root, err := xmlpath.Parse(file)
// if err != nil {
// log.Fatal(err)
// }
// if value, ok := path.String(root); ok {
// fmt.Println("Found:", value)
// }
//
package xmlpath
package xmlpath
import (
"encoding/xml"
"io"
)
// Node is an item in an xml tree that was compiled to
// be processed via xml paths. A node may represent:
//
// - An element in the xml document (<body>)
// - An attribute of an element in the xml document (href="...")
// - A comment in the xml document (<!--...-->)
// - A processing instruction in the xml document (<?...?>)
// - Some text within the xml document
//
type Node struct {
kind nodeKind
name xml.Name
attr string
text []byte
nodes []Node
pos int
end int
up *Node
down []*Node
}
type nodeKind int
const (
anyNode nodeKind = iota
startNode
endNode
attrNode
textNode
commentNode
procInstNode
)
// String returns the string value of node.
//
// The string value of a node is:
//
// - For element nodes, the concatenation of all text nodes within the element.
// - For text nodes, the text itself.
// - For attribute nodes, the attribute value.
// - For comment nodes, the text within the comment delimiters.
// - For processing instruction nodes, the content of the instruction.
//
func (node *Node) String() string {
if node.kind == attrNode {
return node.attr
}
return string(node.Bytes())
}
// Bytes returns the string value of node as a byte slice.
// See Node.String for a description of what the string value of a node is.
func (node *Node) Bytes() []byte {
if node.kind == attrNode {
return []byte(node.attr)
}
if node.kind != startNode {
return node.text
}
var text []byte
for i := node.pos; i < node.end; i++ {
if node.nodes[i].kind == textNode {
text = append(text, node.nodes[i].text...)
}
}
return text
}
// equals returns whether the string value of node is equal to s,
// without allocating memory.
func (node *Node) equals(s string) bool {
if node.kind == attrNode {
return s == node.attr
}
if node.kind != startNode {
if len(s) != len(node.text) {
return false
}
for i := range s {
if s[i] != node.text[i] {
return false
}
}
return true
}
si := 0
for i := node.pos; i < node.end; i++ {
if node.nodes[i].kind == textNode {
for _, c := range node.nodes[i].text {
if si > len(s) {
return false
}
if s[si] != c {
return false
}
si++
}
}
}
return si == len(s)
}
// Parse reads an xml document from r, parses it, and returns its root node.
func Parse(r io.Reader) (*Node, error) {
return ParseDecoder(xml.NewDecoder(r))
}
// ParseHTML reads an HTML-like document from r, parses it, and returns
// its root node.
func ParseHTML(r io.Reader) (*Node, error) {
d := xml.NewDecoder(r)
d.Strict = false
d.AutoClose = xml.HTMLAutoClose
d.Entity = xml.HTMLEntity
return ParseDecoder(d)
}
// ParseDecoder parses the xml document being decoded by d and returns
// its root node.
func ParseDecoder(d *xml.Decoder) (*Node, error) {
var nodes []Node
var text []byte
// The root node.
nodes = append(nodes, Node{kind: startNode})
for {
t, err := d.Token()
if err == io.EOF {
break
}
if err != nil {
return nil, err
}
switch t := t.(type) {
case xml.EndElement:
nodes = append(nodes, Node{
kind: endNode,
})
case xml.StartElement:
nodes = append(nodes, Node{
kind: startNode,
name: t.Name,
})
for _, attr := range t.Attr {
nodes = append(nodes, Node{
kind: attrNode,
name: attr.Name,
attr: attr.Value,
})
}
case xml.CharData:
texti := len(text)
text = append(text, t...)
nodes = append(nodes, Node{
kind: textNode,
text: text[texti : texti+len(t)],
})
case xml.Comment:
texti := len(text)
text = append(text, t...)
nodes = append(nodes, Node{
kind: commentNode,
text: text[texti : texti+len(t)],
})
case xml.ProcInst:
texti := len(text)
text = append(text, t.Inst...)
nodes = append(nodes, Node{
kind: procInstNode,
name: xml.Name{Local: t.Target},
text: text[texti : texti+len(t.Inst)],
})
}
}
// Close the root node.
nodes = append(nodes, Node{kind: endNode})
stack := make([]*Node, 0, len(nodes))
downs := make([]*Node, len(nodes))
downCount := 0
for pos := range nodes {
switch nodes[pos].kind {
case startNode, attrNode, textNode, commentNode, procInstNode:
node := &nodes[pos]
node.nodes = nodes
node.pos = pos
if len(stack) > 0 {
node.up = stack[len(stack)-1]
}
if node.kind == startNode {
stack = append(stack, node)
} else {
node.end = pos + 1
}
case endNode:
node := stack[len(stack)-1]
node.end = pos
stack = stack[:len(stack)-1]
// Compute downs. Doing that here is what enables the
// use of a slice of a contiguous pre-allocated block.
node.down = downs[downCount:downCount]
for i := node.pos + 1; i < node.end; i++ {
if nodes[i].up == node {
switch nodes[i].kind {
case startNode, textNode, commentNode, procInstNode:
node.down = append(node.down, &nodes[i])
downCount++
}
}
}
if len(stack) == 0 {
return node, nil
}
}
}
return nil, io.EOF
}
This diff is collapsed.
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