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@cho45
Created July 30, 2008 06:49
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$X
// extend version of $X
// $X(exp);
// $X(exp, context);
// $X(exp, type);
// $X(exp, context, type);
function $X (exp, context, type /* want type */) {
if (typeof context == "function") {
type = context;
context = null;
}
if (!context) context = document;
exp = (context.ownerDocument || context).createExpression(exp, function (prefix) {
var o = document.createNSResolver(context)(prefix);
if (o) return o;
return (document.contentType == "application/xhtml+xml") ? "http://www.w3.org/1999/xhtml" : "";
});
switch (type) {
case String: return exp.evaluate(context, XPathResult.STRING_TYPE, null).stringValue;
case Number: return exp.evaluate(context, XPathResult.NUMBER_TYPE, null).numberValue;
case Boolean: return exp.evaluate(context, XPathResult.BOOLEAN_TYPE, null).booleanValue;
case Array:
var result = exp.evaluate(context, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
for (var ret = [], i = 0, len = result.snapshotLength; i < len; i++) {
ret.push(result.snapshotItem(i));
}
return ret;
case undefined:
var result = exp.evaluate(context, XPathResult.ANY_TYPE, null);
switch (result.resultType) {
case XPathResult.STRING_TYPE : return result.stringValue;
case XPathResult.NUMBER_TYPE : return result.numberValue;
case XPathResult.BOOLEAN_TYPE: return result.booleanValue;
case XPathResult.UNORDERED_NODE_ITERATOR_TYPE:
// not ensure the order.
var ret = [], i = null;
while ((i = result.iterateNext())) ret.push(i);
return ret;
}
return null;
default: throw(TypeError("$X: specified type is not valid type."));
}
}
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