76 lines
3.1 KiB
Go
76 lines
3.1 KiB
Go
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// Package xmlpath implements a strict subset of the XPath specification for the Go language.
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//
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// The XPath specification is available at:
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//
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// http://www.w3.org/TR/xpath
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//
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// Path expressions supported by this package are in the following format,
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// with all components being optional:
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//
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// /axis-name::node-test[predicate]/axis-name::node-test[predicate]
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//
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// At the moment, xmlpath is compatible with the XPath specification
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// to the following extent:
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//
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// - All axes are supported ("child", "following-sibling", etc)
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// - All abbreviated forms are supported (".", "//", etc)
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// - All node types except for namespace are supported
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// - Predicates may be [N], [path], [not(path)], [path=literal] or [contains(path, literal)]
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// - Predicates may be joined with "or", "and", and parenthesis
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// - Richer expressions and namespaces are not supported
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//
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// For example, assuming the following document:
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//
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// <library>
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// <!-- Great book. -->
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// <book id="b0836217462" available="true">
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// <isbn>0836217462</isbn>
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// <title lang="en">Being a Dog Is a Full-Time Job</title>
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// <quote>I'd dog paddle the deepest ocean.</quote>
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// <author id="CMS">
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// <?echo "go rocks"?>
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// <name>Charles M Schulz</name>
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// <born>1922-11-26</born>
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// <dead>2000-02-12</dead>
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// </author>
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// <character id="PP">
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// <name>Peppermint Patty</name>
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// <born>1966-08-22</born>
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// <qualification>bold, brash and tomboyish</qualification>
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// </character>
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// <character id="Snoopy">
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// <name>Snoopy</name>
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// <born>1950-10-04</born>
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// <qualification>extroverted beagle</qualification>
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// </character>
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// </book>
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// </library>
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//
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// The following examples are valid path expressions, and the first
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// match has the indicated value:
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//
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// /library/book/isbn => "0836217462"
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// library/*/isbn => "0836217462"
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// /library/book/../book/./isbn => "0836217462"
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// /library/book/character[2]/name => "Snoopy"
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// /library/book/character[born='1950-10-04']/name => "Snoopy"
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// /library/book//node()[@id='PP']/name => "Peppermint Patty"
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// //book[author/@id='CMS']/title => "Being a Dog Is a Full-Time Job",
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// /library/book/preceding::comment() => " Great book. "
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// //*[contains(born,'1922')]/name => "Charles M Schulz"
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// //*[@id='PP' or @id='Snoopy']/born => {"1966-08-22", "1950-10-04"}
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//
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// To run an expression, compile it, and then apply the compiled path to any
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// number of context nodes, from one or more parsed xml documents:
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//
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// path := xmlpath.MustCompile("/library/book/isbn")
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// root, err := xmlpath.Parse(file)
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// if err != nil {
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// log.Fatal(err)
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// }
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// if value, ok := path.String(root); ok {
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// fmt.Println("Found:", value)
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// }
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//
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package xmlpath
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