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File: dataschema/js/dataschema-xml.js

 /**
 Provides a DataSchema implementation which can be used to work with XML data.
 
 @module dataschema
 @submodule dataschema-xml
 **/
 
 /**
 Provides a DataSchema implementation which can be used to work with XML data.
 
 See the `apply` method for usage.
 
 @class DataSchema.XML
 @extends DataSchema.Base
 @static
 **/
 var Lang = Y.Lang,
 
 okNodeType = {
 1 : true,
 9 : true,
 11: true
 },
 
 SchemaXML;
 
 SchemaXML = {
 
 ////////////////////////////////////////////////////////////////////////////
 //
 // DataSchema.XML static methods
 //
 ////////////////////////////////////////////////////////////////////////////
 /**
 Applies a schema to an XML data tree, returning a normalized object with
 results in the `results` property. Additional information can be parsed out
 of the XML for inclusion in the `meta` property of the response object. If
 an error is encountered during processing, an `error` property will be
 added.
 
 Field data in the nodes captured by the XPath in _schema.resultListLocator_
 is extracted with the field identifiers described in _schema.resultFields_.
 Field identifiers are objects with the following properties:
 
 * `key` : <strong>(required)</strong> The desired property name to use
 store the retrieved value in the result object. If `locator` is
 not specified, `key` is also used as the XPath locator (String)
 * `locator`: The XPath locator to the node or attribute within each
 result node found by _schema.resultListLocator_ containing the
 desired field data (String)
 * `parser` : A function or the name of a function on `Y.Parsers` used
 to convert the input value into a normalized type. Parser
 functions are passed the value as input and are expected to
 return a value.
 * `schema` : Used to retrieve nested field data into an array for
 assignment as the result field value. This object follows the same
 conventions as _schema_.
 
 If no value parsing or nested parsing is needed, you can use XPath locators
 (strings) instead of field identifiers (objects) -- see example below.
 
 `response.results` will contain an array of objects with key:value pairs.
 The keys are the field identifier `key`s, and the values are the data
 values extracted from the nodes or attributes found by the field `locator`
 (or `key` fallback).
 
 To extract additional information from the XML, include an array of
 XPath locators in _schema.metaFields_. The collected values will be
 stored in `response.meta` with the XPath locator as keys.
 
 @example
 var schema = {
 resultListLocator: '//produce/item',
 resultFields: [
 {
 locator: 'name',
 key: 'name'
 },
 {
 locator: 'color',
 key: 'color',
 parser: function (val) { return val.toUpperCase(); }
 }
 ]
 };
 
 // Assumes data like
 // <inventory>
 // <produce>
 // <item><name>Banana</name><color>yellow</color></item>
 // <item><name>Orange</name><color>orange</color></item>
 // <item><name>Eggplant</name><color>purple</color></item>
 // </produce>
 // </inventory>
 
 var response = Y.DataSchema.JSON.apply(schema, data);
 
 // response.results[0] is { name: "Banana", color: "YELLOW" }
 
 @method apply
 @param {Object} schema Schema to apply. Supported configuration
 properties are:
 @param {String} [schema.resultListLocator] XPath locator for the
 XML nodes that contain the data to flatten into `response.results`
 @param {Array} [schema.resultFields] Field identifiers to
 locate/assign values in the response records. See above for
 details.
 @param {Array} [schema.metaFields] XPath locators to extract extra
 non-record related information from the XML data
 @param {XMLDocument} data XML data to parse
 @return {Object} An Object with properties `results` and `meta`
 @static
 **/
 apply: function(schema, data) {
 var xmldoc = data, // unnecessary variables
 data_out = { results: [], meta: {} };
 
 if (xmldoc && okNodeType[xmldoc.nodeType] && schema) {
 // Parse results data
 data_out = SchemaXML._parseResults(schema, xmldoc, data_out);
 
 // Parse meta data
 data_out = SchemaXML._parseMeta(schema.metaFields, xmldoc, data_out);
 } else {
 Y.log("XML data could not be schema-parsed: " + Y.dump(data) + " " + Y.dump(data), "error", "dataschema-xml");
 data_out.error = new Error("XML schema parse failure");
 }
 
 return data_out;
 },
 
 /**
 * Get an XPath-specified value for a given field from an XML node or document.
 *
 * @method _getLocationValue
 * @param field {String | Object} Field definition.
 * @param context {Object} XML node or document to search within.
 * @return {Object} Data value or null.
 * @static
 * @protected
 */
 _getLocationValue: function(field, context) {
 var locator = field.locator || field.key || field,
 xmldoc = context.ownerDocument || context,
 result, res, value = null;
 
 try {
 result = SchemaXML._getXPathResult(locator, context, xmldoc);
 while ((res = result.iterateNext())) {
 value = res.textContent || res.value || res.text || res.innerHTML || res.innerText || null;
 }
 
 // FIXME: Why defer to a method that is mixed into this object?
 // DSchema.Base is mixed into DSchema.XML (et al), so
 // DSchema.XML.parse(...) will work. This supports the use case
 // where DSchema.Base.parse is changed, and that change is then
 // seen by all DSchema.* implementations, but does not support the
 // case where redefining DSchema.XML.parse changes behavior. In
 // fact, DSchema.XML.parse is never even called.
 return Y.DataSchema.Base.parse.call(this, value, field);
 } catch (e) {
 Y.log('SchemaXML._getLocationValue failed: ' + e.message);
 }
 
 return null;
 },
 
 /**
 * Fetches the XPath-specified result for a given location in an XML node
 * or document.
 *
 * @method _getXPathResult
 * @param locator {String} The XPath location.
 * @param context {Object} XML node or document to search within.
 * @param xmldoc {Object} XML document to resolve namespace.
 * @return {Object} Data collection or null.
 * @static
 * @protected
 */
 _getXPathResult: function(locator, context, xmldoc) {
 // Standards mode
 if (! Lang.isUndefined(xmldoc.evaluate)) {
 return xmldoc.evaluate(locator, context, xmldoc.createNSResolver(context.ownerDocument ? context.ownerDocument.documentElement : context.documentElement), 0, null);
 
 }
 // IE mode
 else {
 var values=[], locatorArray = locator.split(/\b\/\b/), i=0, l=locatorArray.length, location, subloc, m, isNth;
 
 // XPath is supported
 try {
 // this fixes the IE 5.5+ issue where childnode selectors begin at 0 instead of 1
 try {
 xmldoc.setProperty("SelectionLanguage", "XPath");
 } catch (e) {}
 
 values = context.selectNodes(locator);
 }
 // Fallback for DOM nodes and fragments
 catch (e) {
 // Iterate over each locator piece
 for (; i<l && context; i++) {
 location = locatorArray[i];
 
 // grab nth child []
 if ((location.indexOf("[") > -1) && (location.indexOf("]") > -1)) {
 subloc = location.slice(location.indexOf("[")+1, location.indexOf("]"));
 //XPath is 1-based while DOM is 0-based
 subloc--;
 context = context.children[subloc];
 isNth = true;
 }
 // grab attribute value @
 else if (location.indexOf("@") > -1) {
 subloc = location.substr(location.indexOf("@"));
 context = subloc ? context.getAttribute(subloc.replace('@', '')) : context;
 }
 // grab that last instance of tagName
 else if (-1 < location.indexOf("//")) {
 subloc = context.getElementsByTagName(location.substr(2));
 context = subloc.length ? subloc[subloc.length - 1] : null;
 }
 // find the last matching location in children
 else if (l != i + 1) {
 for (m=context.childNodes.length-1; 0 <= m; m-=1) {
 if (location === context.childNodes[m].tagName) {
 context = context.childNodes[m];
 m = -1;
 }
 }
 }
 }
 
 if (context) {
 // attribute
 if (Lang.isString(context)) {
 values[0] = {value: context};
 }
 // nth child
 else if (isNth) {
 values[0] = {value: context.innerHTML};
 }
 // all children
 else {
 values = Y.Array(context.childNodes, 0, true);
 }
 }
 }
 
 // returning a mock-standard object for IE
 return {
 index: 0,
 
 iterateNext: function() {
 if (this.index >= this.values.length) {return undefined;}
 var result = this.values[this.index];
 this.index += 1;
 return result;
 },
 
 values: values
 };
 }
 },
 
 /**
 * Schema-parsed result field.
 *
 * @method _parseField
 * @param field {String | Object} Required. Field definition.
 * @param result {Object} Required. Schema parsed data object.
 * @param context {Object} Required. XML node or document to search within.
 * @static
 * @protected
 */
 _parseField: function(field, result, context) {
 var key = field.key || field,
 parsed;
 
 if (field.schema) {
 parsed = { results: [], meta: {} };
 parsed = SchemaXML._parseResults(field.schema, context, parsed);
 
 result[key] = parsed.results;
 } else {
 result[key] = SchemaXML._getLocationValue(field, context);
 }
 },
 
 /**
 * Parses results data according to schema
 *
 * @method _parseMeta
 * @param xmldoc_in {Object} XML document parse.
 * @param data_out {Object} In-progress schema-parsed data to update.
 * @return {Object} Schema-parsed data.
 * @static
 * @protected
 */
 _parseMeta: function(metaFields, xmldoc_in, data_out) {
 if(Lang.isObject(metaFields)) {
 var key,
 xmldoc = xmldoc_in.ownerDocument || xmldoc_in;
 
 for(key in metaFields) {
 if (metaFields.hasOwnProperty(key)) {
 data_out.meta[key] = SchemaXML._getLocationValue(metaFields[key], xmldoc);
 }
 }
 }
 return data_out;
 },
 
 /**
 * Schema-parsed result to add to results list.
 *
 * @method _parseResult
 * @param fields {Array} Required. A collection of field definition.
 * @param context {Object} Required. XML node or document to search within.
 * @return {Object} Schema-parsed data.
 * @static
 * @protected
 */
 _parseResult: function(fields, context) {
 var result = {}, j;
 
 // Find each field value
 for (j=fields.length-1; 0 <= j; j--) {
 SchemaXML._parseField(fields[j], result, context);
 }
 
 return result;
 },
 
 /**
 * Schema-parsed list of results from full data
 *
 * @method _parseResults
 * @param schema {Object} Schema to parse against.
 * @param context {Object} XML node or document to parse.
 * @param data_out {Object} In-progress schema-parsed data to update.
 * @return {Object} Schema-parsed data.
 * @static
 * @protected
 */
 _parseResults: function(schema, context, data_out) {
 if (schema.resultListLocator && Lang.isArray(schema.resultFields)) {
 var xmldoc = context.ownerDocument || context,
 fields = schema.resultFields,
 results = [],
 node, nodeList, i=0;
 
 if (schema.resultListLocator.match(/^[:\-\w]+$/)) {
 nodeList = context.getElementsByTagName(schema.resultListLocator);
 
 // loop through each result node
 for (i = nodeList.length - 1; i >= 0; --i) {
 results[i] = SchemaXML._parseResult(fields, nodeList[i]);
 }
 } else {
 nodeList = SchemaXML._getXPathResult(schema.resultListLocator, context, xmldoc);
 
 // loop through the nodelist
 while ((node = nodeList.iterateNext())) {
 results[i] = SchemaXML._parseResult(fields, node);
 i += 1;
 }
 }
 
 if (results.length) {
 data_out.results = results;
 } else {
 data_out.error = new Error("XML schema result nodes retrieval failure");
 }
 }
 return data_out;
 }
 };
 
 Y.DataSchema.XML = Y.mix(SchemaXML, Y.DataSchema.Base);
 
 

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