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Added operation: "XPath expression"

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Mike Schwörer 2016-11-29 19:28:07 +01:00
parent 09d515cbae
commit 51b627ab29
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6 changed files with 6464 additions and 2 deletions
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65
src/js/operations/Extract.js
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@ -10,7 +10,7 @@
var Extract = {
/**
* Runs search operations across the input data using refular expressions.
* Runs search operations across the input data using regular expressions.
*
* @private
* @param {string} input
@ -293,5 +293,66 @@ var Extract = {
output += Extract.run_dates(input, []);
return output;
},
/**
* @constant
* @default
*/
XPATH_INITIAL: "",
/**
* @constant
* @default
*/
XPATH_DELIMITER: "\\n",
/**
* Extract information (from an xml document) with an XPath query
*
* @param {string} input
* @param {Object[]} args
* @returns {string}
*/
run_xpath:function(input, args) {
var query = args[0];
var delimiter = args[1];
try {
var xml = $.parseXML(input);
} catch (err) {
return "Invalid input XML.";
}
try {
var result = $.xpath(xml, query);
} catch (err) {
return "Invalid XPath. Details:\n" + err.message;
}
var serializer = new XMLSerializer();
var output = "";
for (var i = 0; i < result.length; i++) {
if (i > 0) output += delimiter;
switch (result[i].nodeType) {
case Node.ELEMENT_NODE:
output += serializer.serializeToString(result[i]);
break;
case Node.ATTRIBUTE_NODE:
output += result[i].value;
break;
case Node.TEXT_NODE:
output += result[i].wholeText;
break;
case Node.COMMENT_NODE:
output += result[i].data;
break;
default:
throw new Error("Unknown Node Type: " + result[i].nodeType);
}
}
return output;
}
};