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551 lines
13 KiB
551 lines
13 KiB
;(function(undefined) {
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'use strict';
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/**
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* GEXF Library
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* =============
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*
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* Author: PLIQUE Guillaume (Yomguithereal)
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* URL: https://github.com/Yomguithereal/gexf-parser
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* Version: 0.1.1
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*/
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/**
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* Helper Namespace
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* -----------------
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*
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* A useful batch of function dealing with DOM operations and types.
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*/
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var _helpers = {
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getModelTags: function(xml) {
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var attributesTags = xml.getElementsByTagName('attributes'),
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modelTags = {},
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l = attributesTags.length,
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i;
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for (i = 0; i < l; i++)
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modelTags[attributesTags[i].getAttribute('class')] =
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attributesTags[i].childNodes;
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return modelTags;
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},
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nodeListToArray: function(nodeList) {
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// Return array
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var children = [];
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// Iterating
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for (var i = 0, len = nodeList.length; i < len; ++i) {
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if (nodeList[i].nodeName !== '#text')
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children.push(nodeList[i]);
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}
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return children;
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},
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nodeListEach: function(nodeList, func) {
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// Iterating
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for (var i = 0, len = nodeList.length; i < len; ++i) {
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if (nodeList[i].nodeName !== '#text')
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func(nodeList[i]);
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}
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},
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nodeListToHash: function(nodeList, filter) {
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// Return object
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var children = {};
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// Iterating
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for (var i = 0; i < nodeList.length; i++) {
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if (nodeList[i].nodeName !== '#text') {
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var prop = filter(nodeList[i]);
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children[prop.key] = prop.value;
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}
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}
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return children;
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},
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namedNodeMapToObject: function(nodeMap) {
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// Return object
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var attributes = {};
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// Iterating
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for (var i = 0; i < nodeMap.length; i++) {
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attributes[nodeMap[i].name] = nodeMap[i].value;
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}
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return attributes;
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},
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getFirstElementByTagNS: function(node, ns, tag) {
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var el = node.getElementsByTagName(ns + ':' + tag)[0];
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if (!el)
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el = node.getElementsByTagNameNS(ns, tag)[0];
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if (!el)
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el = node.getElementsByTagName(tag)[0];
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return el;
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},
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getAttributeNS: function(node, ns, attribute) {
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var attr_value = node.getAttribute(ns + ':' + attribute);
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if (attr_value === undefined)
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attr_value = node.getAttributeNS(ns, attribute);
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if (attr_value === undefined)
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attr_value = node.getAttribute(attribute);
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return attr_value;
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},
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enforceType: function(type, value) {
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switch (type) {
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case 'boolean':
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value = (value === 'true');
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break;
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case 'integer':
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case 'long':
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case 'float':
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case 'double':
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value = +value;
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break;
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case 'liststring':
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value = value ? value.split('|') : [];
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break;
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}
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return value;
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},
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getRGB: function(values) {
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return (values[3]) ?
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'rgba(' + values.join(',') + ')' :
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'rgb(' + values.slice(0, -1).join(',') + ')';
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}
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};
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/**
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* Parser Core Functions
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* ----------------------
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*
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* The XML parser's functions themselves.
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*/
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/**
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* Node structure.
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* A function returning an object guarded with default value.
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*
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* @param {object} properties The node properties.
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* @return {object} The guarded node object.
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*/
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function Node(properties) {
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// Possible Properties
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var node = {
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id: properties.id,
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label: properties.label
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};
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if (properties.viz)
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node.viz = properties.viz;
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if (properties.attributes)
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node.attributes = properties.attributes;
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return node;
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}
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/**
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* Edge structure.
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* A function returning an object guarded with default value.
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*
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* @param {object} properties The edge properties.
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* @return {object} The guarded edge object.
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*/
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function Edge(properties) {
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// Possible Properties
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var edge = {
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id: properties.id,
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type: properties.type || 'undirected',
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label: properties.label || '',
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source: properties.source,
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target: properties.target,
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weight: +properties.weight || 1.0
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};
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if (properties.viz)
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edge.viz = properties.viz;
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if (properties.attributes)
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edge.attributes = properties.attributes;
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return edge;
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}
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/**
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* Graph parser.
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* This structure parse a gexf string and return an object containing the
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* parsed graph.
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*
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* @param {string} xml The xml string of the gexf file to parse.
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* @return {object} The parsed graph.
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*/
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function Graph(xml) {
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var _xml = {};
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// Basic Properties
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//------------------
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_xml.els = {
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root: xml.getElementsByTagName('gexf')[0],
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graph: xml.getElementsByTagName('graph')[0],
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meta: xml.getElementsByTagName('meta')[0],
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nodes: xml.getElementsByTagName('node'),
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edges: xml.getElementsByTagName('edge'),
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model: _helpers.getModelTags(xml)
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};
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// Information
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_xml.hasViz = !!_helpers.getAttributeNS(_xml.els.root, 'xmlns', 'viz');
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_xml.version = _xml.els.root.getAttribute('version') || '1.0';
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_xml.mode = _xml.els.graph.getAttribute('mode') || 'static';
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var edgeType = _xml.els.graph.getAttribute('defaultedgetype');
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_xml.defaultEdgetype = edgeType || 'undirected';
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// Parser Functions
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//------------------
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// Meta Data
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function _metaData() {
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var metas = {};
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if (!_xml.els.meta)
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return metas;
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// Last modified date
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metas.lastmodifieddate = _xml.els.meta.getAttribute('lastmodifieddate');
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// Other information
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_helpers.nodeListEach(_xml.els.meta.childNodes, function(child) {
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metas[child.tagName.toLowerCase()] = child.textContent;
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});
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return metas;
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}
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// Model
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function _model(cls) {
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var attributes = [];
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// Iterating through attributes
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if (_xml.els.model[cls])
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_helpers.nodeListEach(_xml.els.model[cls], function(attr) {
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// Properties
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var properties = {
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id: attr.getAttribute('id') || attr.getAttribute('for'),
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type: attr.getAttribute('type') || 'string',
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title: attr.getAttribute('title') || ''
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};
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// Defaults
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var default_el = _helpers.nodeListToArray(attr.childNodes);
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if (default_el.length > 0)
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properties.defaultValue = default_el[0].textContent;
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// Creating attribute
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attributes.push(properties);
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});
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return attributes.length > 0 ? attributes : false;
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}
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// Data from nodes or edges
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function _data(model, node_or_edge) {
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var data = {};
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var attvalues_els = node_or_edge.getElementsByTagName('attvalue');
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// Getting Node Indicated Attributes
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var ah = _helpers.nodeListToHash(attvalues_els, function(el) {
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var attributes = _helpers.namedNodeMapToObject(el.attributes);
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var key = attributes.id || attributes['for'];
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// Returning object
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return {key: key, value: attributes.value};
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});
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// Iterating through model
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model.map(function(a) {
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// Default value?
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data[a.id] = !(a.id in ah) && 'defaultValue' in a ?
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_helpers.enforceType(a.type, a.defaultValue) :
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_helpers.enforceType(a.type, ah[a.id]);
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});
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return data;
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}
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// Nodes
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function _nodes(model) {
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var nodes = [];
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// Iteration through nodes
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_helpers.nodeListEach(_xml.els.nodes, function(n) {
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// Basic properties
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var properties = {
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id: n.getAttribute('id'),
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label: n.getAttribute('label') || ''
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};
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// Retrieving data from nodes if any
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if (model)
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properties.attributes = _data(model, n);
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// Retrieving viz information
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if (_xml.hasViz)
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properties.viz = _nodeViz(n);
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// Pushing node
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nodes.push(Node(properties));
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});
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return nodes;
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}
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// Viz information from nodes
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function _nodeViz(node) {
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var viz = {};
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// Color
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var color_el = _helpers.getFirstElementByTagNS(node, 'viz', 'color');
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if (color_el) {
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var color = ['r', 'g', 'b', 'a'].map(function(c) {
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return color_el.getAttribute(c);
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});
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viz.color = _helpers.getRGB(color);
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}
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// Position
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var pos_el = _helpers.getFirstElementByTagNS(node, 'viz', 'position');
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if (pos_el) {
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viz.position = {};
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['x', 'y', 'z'].map(function(p) {
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viz.position[p] = +pos_el.getAttribute(p);
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});
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}
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// Size
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var size_el = _helpers.getFirstElementByTagNS(node, 'viz', 'size');
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if (size_el)
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viz.size = +size_el.getAttribute('value');
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// Shape
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var shape_el = _helpers.getFirstElementByTagNS(node, 'viz', 'shape');
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if (shape_el)
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viz.shape = shape_el.getAttribute('value');
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return viz;
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}
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// Edges
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function _edges(model, default_type) {
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var edges = [];
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// Iteration through edges
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_helpers.nodeListEach(_xml.els.edges, function(e) {
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// Creating the edge
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var properties = _helpers.namedNodeMapToObject(e.attributes);
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if (!('type' in properties)) {
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properties.type = default_type;
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}
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// Retrieving edge data
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if (model)
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properties.attributes = _data(model, e);
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// Retrieving viz information
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if (_xml.hasViz)
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properties.viz = _edgeViz(e);
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edges.push(Edge(properties));
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});
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return edges;
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}
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// Viz information from edges
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function _edgeViz(edge) {
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var viz = {};
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// Color
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var color_el = _helpers.getFirstElementByTagNS(edge, 'viz', 'color');
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if (color_el) {
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var color = ['r', 'g', 'b', 'a'].map(function(c) {
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return color_el.getAttribute(c);
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});
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viz.color = _helpers.getRGB(color);
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}
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// Shape
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var shape_el = _helpers.getFirstElementByTagNS(edge, 'viz', 'shape');
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if (shape_el)
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viz.shape = shape_el.getAttribute('value');
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// Thickness
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var thick_el = _helpers.getFirstElementByTagNS(edge, 'viz', 'thickness');
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if (thick_el)
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viz.thickness = +thick_el.getAttribute('value');
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return viz;
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}
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// Returning the Graph
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//---------------------
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var nodeModel = _model('node'),
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edgeModel = _model('edge');
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var graph = {
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version: _xml.version,
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mode: _xml.mode,
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defaultEdgeType: _xml.defaultEdgetype,
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meta: _metaData(),
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model: {},
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nodes: _nodes(nodeModel),
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edges: _edges(edgeModel, _xml.defaultEdgetype)
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};
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if (nodeModel)
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graph.model.node = nodeModel;
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if (edgeModel)
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graph.model.edge = edgeModel;
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return graph;
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}
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/**
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* Public API
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* -----------
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*
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* User-accessible functions.
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*/
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// Fetching GEXF with XHR
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function fetch(gexf_url, callback) {
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var xhr = (function() {
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if (window.XMLHttpRequest)
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return new XMLHttpRequest();
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var names,
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i;
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if (window.ActiveXObject) {
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names = [
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'Msxml2.XMLHTTP.6.0',
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'Msxml2.XMLHTTP.3.0',
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'Msxml2.XMLHTTP',
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'Microsoft.XMLHTTP'
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];
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for (i in names)
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try {
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return new ActiveXObject(names[i]);
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} catch (e) {}
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}
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return null;
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})();
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if (!xhr)
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throw 'XMLHttpRequest not supported, cannot load the file.';
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// Async?
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var async = (typeof callback === 'function'),
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getResult;
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// If we can't override MIME type, we are on IE 9
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// We'll be parsing the response string then.
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if (xhr.overrideMimeType) {
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xhr.overrideMimeType('text/xml');
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getResult = function(r) {
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return r.responseXML;
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};
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}
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else {
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getResult = function(r) {
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var p = new DOMParser();
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return p.parseFromString(r.responseText, 'application/xml');
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};
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}
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xhr.open('GET', gexf_url, async);
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if (async)
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xhr.onreadystatechange = function() {
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if (xhr.readyState === 4)
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callback(getResult(xhr));
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};
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xhr.send();
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return (async) ? xhr : getResult(xhr);
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}
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// Parsing the GEXF File
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function parse(gexf) {
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return Graph(gexf);
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}
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// Fetch and parse the GEXF File
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function fetchAndParse(gexf_url, callback) {
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if (typeof callback === 'function') {
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return fetch(gexf_url, function(gexf) {
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callback(Graph(gexf));
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});
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} else
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return Graph(fetch(gexf_url));
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}
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/**
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* Exporting
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* ----------
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*/
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if (typeof this.gexf !== 'undefined')
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throw 'gexf: error - a variable called "gexf" already ' +
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'exists in the global scope';
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this.gexf = {
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// Functions
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parse: parse,
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fetch: fetchAndParse,
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// Version
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version: '0.1.1'
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};
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if (typeof exports !== 'undefined' && this.exports !== exports)
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module.exports = this.gexf;
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}).call(this);
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