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complex $X
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// $X | |
// | |
// usage: | |
// | |
// $X(aExpression); | |
// $X(aExpression, aContext, aType); | |
// $X(aExpression, aContext, aType, aResolver, aNamespaceHash); | |
// $X(aNamespaceHash, aResolver, aType, aContext, aExpression); | |
// | |
// or | |
// | |
// $X() | |
// .setExpression(aXPathExpression) // XPath expression | |
// .setCotext(aContext) // to use relative XPath | |
// .setType(aType) // type of result (*1) | |
// .setNamespace(aNamespaceHash) // namespace hash (*2) | |
// .setResolver(aResolver) // function. high priority than NamespaceHash | |
// .setDocument(aDocument) // base document | |
// .setDefault(aExpression, aContext, aType, aResolver, aNamespaceHash) // same as $X() arguments | |
// .evaluate(); | |
// | |
// or | |
// | |
// var $x = $X().setDocument(aDocument).setNamespace(aNamespaceHash).getX(); | |
// $x(aExpression, aContext, aType); | |
// *1 type of result example | |
// | |
// var aType = Number // return Number | |
// var aType = Boolean // return Boolean | |
// var aType = String // return String | |
// var aType = Array // return Array | |
// | |
// *2 namespace hash example | |
// | |
// var aNamespaceHash = { | |
// h: "http://www.w3.org/1999/xhtml" | |
// , rdf: "http://www.w3.org/1999/02/22-rdf-syntax-ns#" | |
// , grddl: "http://www.w3.org/2003/g/data-view#" | |
// } | |
function $X(){ | |
function XPath(){return (this instanceof XPath) ? this : new XPath()} | |
XPath.prototype = { | |
evaluate: function(){ | |
var self = this; | |
var doc = this.doc || | |
(window.content && window.content.document) || // for Addons | |
document.ownerDocument || | |
document; | |
var context = this.context || doc; | |
var resolver = this.resolver || function(prefix){ | |
if(doc.contentType == "text/html") return ""; // text/html need no namespace uri | |
return (self.namespace[prefix] || | |
((doc.contentType == "application/xhtml+xml") && "http://www.w3.org/1999/xhtml") || | |
doc.createNSResolver(context.documentElement).lookupNamespaceURI(prefix) || | |
doc.documentElement.namespaceURI); | |
} | |
var exp = doc.createExpression(this.expression, resolver); | |
switch (this.type) { | |
case String: | |
return exp.evaluate( | |
context, | |
XPathResult.STRING_TYPE, | |
null | |
).stringValue; | |
case Number: | |
return exp.evaluate( | |
context, | |
XPathResult.NUMBER_TYPE, | |
null | |
).numberValue; | |
case Boolean: | |
return exp.evaluate( | |
context, | |
XPathResult.BOOLEAN_TYPE, | |
null | |
).booleanValue; | |
case Array: | |
var result = exp.evaluate( | |
context, | |
XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, | |
null | |
); | |
var ret = []; | |
for (var i = 0, len = result.snapshotLength; i < len; ret.push(result.snapshotItem(i++))); | |
return ret; | |
case undefined: | |
var result = exp.evaluate(context, XPathResult.ANY_TYPE, null); | |
switch (result.resultType) { | |
case XPathResult.STRING_TYPE : return result.stringValue; | |
case XPathResult.NUMBER_TYPE : return result.numberValue; | |
case XPathResult.BOOLEAN_TYPE: return result.booleanValue; | |
case XPathResult.UNORDERED_NODE_ITERATOR_TYPE: { | |
// not ensure the order. | |
var ret = []; | |
var i; | |
while ((i = result.iterateNext())) { | |
ret.push(i); | |
} | |
return ret; | |
} | |
} | |
return null; | |
default: | |
throw(TypeError("$X: specified type is not valid type.")); | |
} | |
}, | |
setExpression: function(arg){ | |
this.expression = arg; | |
return this; | |
}, | |
setContext: function(arg){ | |
this.context = arg; | |
return this; | |
}, | |
setType: function(arg){ | |
this.type = arg; | |
return this; | |
}, | |
setResolver: function(arg){ | |
this.resolver = arg; | |
return this; | |
}, | |
setNamespace: function(arg){ | |
this.namespace = arg; | |
return this; | |
}, | |
setDocument: function(arg){ | |
this.doc = arg; | |
return this; | |
}, | |
checkArgumentType: function(o){ | |
return (((o == String || | |
o == Number || | |
o == Boolean || | |
o == Array) && | |
'type') || | |
((typeof o == 'string') && 'expression') || | |
((o instanceof Function) && 'resolver') || | |
((o instanceof Node) && 'context') || | |
((o instanceof Object) && 'namespace') | |
); | |
}, | |
setDefault: function(args){ // args is Array. e.g. setDefault(['//div', context, Array]) | |
var self = this; | |
args = Array.slice(args); | |
args.forEach(function(o){ | |
var a = self.checkArgumentType(o); | |
if(a) self[a] = o; | |
}); | |
return this; | |
}, | |
getX: function(){ | |
var self = this; | |
return function(){ | |
if(arguments.length == 0) return self; | |
return self.setDefault(arguments).evaluate(); | |
} | |
} | |
} | |
if(arguments.length == 0) return XPath(); | |
return XPath() | |
.setDefault(arguments) | |
.evaluate(); | |
} |
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