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Tweaks to 'XPath expression' and 'CSS selector' operations. Closes #13.

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This commit is contained in:
n1474335 2016-12-20 18:49:25 +00:00
parent 650fd9a940
commit 39d50093ae
9 changed files with 189 additions and 169 deletions
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115
src/js/operations/Extract.js
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@ -1,5 +1,3 @@
/* globals xpath */
/**
* Identifier extraction operations.
*
@ -296,117 +294,4 @@ var Extract = {
return output;
},
/**
* @constant
* @default
*/
XPATH_INITIAL: "",
/**
* @constant
* @default
*/
XPATH_DELIMITER: "\\n",
/**
* Extract information (from an xml document) with an XPath query
*
* @author Mikescher (https://github.com/Mikescher | https://mikescher.com)
*
* @param {string} input
* @param {Object[]} args
* @returns {string}
*/
run_xpath:function(input, args) {
const query = args[0];
const delimiter = args[1];
var xml;
try {
xml = $.parseXML(input);
} catch (err) {
return "Invalid input XML.";
}
var result;
try {
result = xpath.evaluate(xml, query);
} catch (err) {
return "Invalid XPath. Details:\n" + err.message;
}
const serializer = new XMLSerializer();
const nodeToString = function(node) {
switch (node.nodeType) {
case Node.ELEMENT_NODE: return serializer.serializeToString(node);
case Node.ATTRIBUTE_NODE: return node.value;
case Node.COMMENT_NODE: return node.data;
case Node.DOCUMENT_NODE: return serializer.serializeToString(node);
default: throw new Error("Unknown Node Type: " + node.nodeType);
}
};
return Object.values(result).slice(0, -1) // all values except last (length)
.map(nodeToString)
.join(delimiter);
},
/**
* @constant
* @default
*/
SELECTOR_INITIAL: "",
/**
* @constant
* @default
*/
CSS_QUERY_DELIMITER: "\\n",
/**
* Extract information (from an hmtl document) with an css selector
*
* @author Mikescher (https://github.com/Mikescher | https://mikescher.com)
*
* @param {string} input
* @param {Object[]} args
* @returns {string}
*/
run_css_query: function(input, args) {
const query = args[0];
const delimiter = args[1];
var html;
try {
html = $.parseHTML(input);
} catch (err) {
return "Invalid input HTML.";
}
var result;
try {
result = $(html).find(query);
} catch (err) {
return "Invalid CSS Selector. Details:\n" + err.message;
}
const nodeToString = function(node) {
switch (node.nodeType) {
case Node.ELEMENT_NODE: return node.outerHTML;
case Node.ATTRIBUTE_NODE: return node.value;
case Node.COMMENT_NODE: return node.data;
case Node.TEXT_NODE: return node.wholeText;
case Node.DOCUMENT_NODE: return node.outerHTML;
default: throw new Error("Unknown Node Type: " + node.nodeType);
}
};
return Array.apply(null, Array(result.length))
.map(function(_, i) {
return result[i];
})
.map(nodeToString)
.join(delimiter);
},
};