Annotation of kupuMPIWG/common/sarissa_ieemu_xpath.js, revision 1.1
1.1 ! dwinter 1: /*****************************************************************************
! 2: *
! 3: * Sarissa XML library version 0.9.6
! 4: * Copyright (c) 2003 Manos Batsis,
! 5: * mailto: mbatsis at users full stop sourceforge full stop net
! 6: * This software is distributed under the Kupu License. See
! 7: * LICENSE.txt for license text. See the Sarissa homepage at
! 8: * http://sarissa.sourceforge.net for more information.
! 9: *
! 10: *****************************************************************************
! 11:
! 12: * ====================================================================
! 13: * About
! 14: * ====================================================================
! 15: * Sarissa cross browser XML library - IE XPath Emulation
! 16: * @version 0.9.6
! 17: * @author: Manos Batsis, mailto: mbatsis at users full stop sourceforge full stop net
! 18: *
! 19: * This script emulates Internet Explorer's selectNodes and selectSingleNode
! 20: * for Mozilla. Associating namespace prefixes with URIs for your XPath queries
! 21: * is easy with IE's setProperty.
! 22: * USers may also map a namespace prefix to a default (unprefixed) namespace in the
! 23: * source document with Sarissa.setXpathNamespaces
! 24: *
! 25: */
! 26: if(_SARISSA_HAS_DOM_FEATURE && document.implementation.hasFeature("XPath", "3.0")){
! 27: /**
! 28: * <p>SarissaNodeList behaves as a NodeList but is only used as a result to <code>selectNodes</code>,
! 29: * so it also has some properties IEs proprietery object features.</p>
! 30: * @private
! 31: * @constructor
! 32: * @argument i the (initial) list size
! 33: */
! 34: function SarissaNodeList(i){
! 35: this.length = i;
! 36: };
! 37: /** <p>Set an Array as the prototype object</p> */
! 38: SarissaNodeList.prototype = new Array(0);
! 39: /** <p>Inherit the Array constructor </p> */
! 40: SarissaNodeList.prototype.constructor = Array;
! 41: /**
! 42: * <p>Returns the node at the specified index or null if the given index
! 43: * is greater than the list size or less than zero </p>
! 44: * <p><b>Note</b> that in ECMAScript you can also use the square-bracket
! 45: * array notation instead of calling <code>item</code>
! 46: * @argument i the index of the member to return
! 47: * @returns the member corresponding to the given index
! 48: */
! 49: SarissaNodeList.prototype.item = function(i) {
! 50: return (i < 0 || i >= this.length)?null:this[i];
! 51: };
! 52: /**
! 53: * <p>Emulate IE's expr property
! 54: * (Here the SarissaNodeList object is given as the result of selectNodes).</p>
! 55: * @returns the XPath expression passed to selectNodes that resulted in
! 56: * this SarissaNodeList
! 57: */
! 58: SarissaNodeList.prototype.expr = "";
! 59: /** dummy, used to accept IE's stuff without throwing errors */
! 60: XMLDocument.prototype.setProperty = function(x,y){};
! 61: /**
! 62: * <p>Programmatically control namespace URI/prefix mappings for XPath
! 63: * queries.</p>
! 64: * <p>This method comes especially handy when used to apply XPath queries
! 65: * on XML documents with a default namespace, as there is no other way
! 66: * of mapping that to a prefix.</p>
! 67: * <p>Using no namespace prefix in DOM Level 3 XPath queries, implies you
! 68: * are looking for elements in the null namespace. If you need to look
! 69: * for nodes in the default namespace, you need to map a prefix to it
! 70: * first like:</p>
! 71: * <pre>Sarissa.setXpathNamespaces(oDoc, "xmlns:myprefix=&aposhttp://mynsURI&apos");</pre>
! 72: * <p><b>Note 1 </b>: Use this method only if the source document features
! 73: * a default namespace (without a prefix), otherwise just use IE's setProperty
! 74: * (moz will rezolve non-default namespaces by itself). You will need to map that
! 75: * namespace to a prefix for queries to work.</p>
! 76: * <p><b>Note 2 </b>: This method calls IE's setProperty method to set the
! 77: * appropriate namespace-prefix mappings, so you dont have to do that.</p>
! 78: * @param oDoc The target XMLDocument to set the namespace mappings for.
! 79: * @param sNsSet A whilespace-seperated list of namespace declarations as
! 80: * those would appear in an XML document. E.g.:
! 81: * <code>"xmlns:xhtml='http://www.w3.org/1999/xhtml'
! 82: * xmlns:'http://www.w3.org/1999/XSL/Transform'"</code>
! 83: * @throws An error if the format of the given namespace declarations is bad.
! 84: */
! 85: Sarissa.setXpathNamespaces = function(oDoc, sNsSet) {
! 86: //oDoc._sarissa_setXpathNamespaces(sNsSet);
! 87: oDoc._sarissa_useCustomResolver = true;
! 88: var namespaces = sNsSet.indexOf(" ")>-1?sNsSet.split(" "):new Array(sNsSet);
! 89: oDoc._sarissa_xpathNamespaces = new Array(namespaces.length);
! 90: for(var i=0;i < namespaces.length;i++){
! 91: var ns = namespaces[i];
! 92: var colonPos = ns.indexOf(":");
! 93: var assignPos = ns.indexOf("=");
! 94: if(colonPos == 5 && assignPos > colonPos+2){
! 95: var prefix = ns.substring(colonPos+1, assignPos);
! 96: var uri = ns.substring(assignPos+2, ns.length-1);
! 97: oDoc._sarissa_xpathNamespaces[prefix] = uri;
! 98: }else{
! 99: throw "Bad format on namespace declaration(s) given";
! 100: };
! 101: };
! 102: };
! 103: /**
! 104: * @private Flag to control whether a custom namespace resolver should
! 105: * be used, set to true by Sarissa.setXpathNamespaces
! 106: */
! 107: XMLDocument.prototype._sarissa_useCustomResolver = false;
! 108: /** @private */
! 109: XMLDocument.prototype._sarissa_xpathNamespaces = new Array();
! 110: /**
! 111: * <p>Extends the XMLDocument to emulate IE's selectNodes.</p>
! 112: * @argument sExpr the XPath expression to use
! 113: * @argument contextNode this is for internal use only by the same
! 114: * method when called on Elements
! 115: * @returns the result of the XPath search as a SarissaNodeList
! 116: * @throws An error if no namespace URI is found for the given prefix.
! 117: */
! 118: XMLDocument.prototype.selectNodes = function(sExpr, contextNode){
! 119: var nsDoc = this;
! 120: var nsresolver = this._sarissa_useCustomResolver
! 121: ? function(prefix){
! 122: var s = nsDoc._sarissa_xpathNamespaces[prefix];
! 123: if(s)return s;
! 124: else throw "No namespace URI found for prefix: '" + prefix+"'";
! 125: }
! 126: : this.createNSResolver(this.documentElement);
! 127: var oResult = this.evaluate(sExpr,
! 128: (contextNode?contextNode:this),
! 129: nsresolver,
! 130: XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
! 131: var nodeList = new SarissaNodeList(oResult.snapshotLength);
! 132: nodeList.expr = sExpr;
! 133: for(var i=0;i<nodeList.length;i++)
! 134: nodeList[i] = oResult.snapshotItem(i);
! 135: return nodeList;
! 136: };
! 137: /**
! 138: * <p>Extends the Element to emulate IE's selectNodes</p>
! 139: * @argument sExpr the XPath expression to use
! 140: * @returns the result of the XPath search as an (Sarissa)NodeList
! 141: * @throws An
! 142: * error if invoked on an HTML Element as this is only be
! 143: * available to XML Elements.
! 144: */
! 145: Element.prototype.selectNodes = function(sExpr){
! 146: var doc = this.ownerDocument;
! 147: if(doc.selectNodes)
! 148: return doc.selectNodes(sExpr, this);
! 149: else
! 150: throw "Method selectNodes is only supported by XML Elements";
! 151: };
! 152: /**
! 153: * <p>Extends the XMLDocument to emulate IE's selectSingleNodes.</p>
! 154: * @argument sExpr the XPath expression to use
! 155: * @argument contextNode this is for internal use only by the same
! 156: * method when called on Elements
! 157: * @returns the result of the XPath search as an (Sarissa)NodeList
! 158: */
! 159: XMLDocument.prototype.selectSingleNode = function(sExpr, contextNode){
! 160: var ctx = contextNode?contextNode:null;
! 161: sExpr = "("+sExpr+")[1]";
! 162: var nodeList = this.selectNodes(sExpr, ctx);
! 163: if(nodeList.length > 0)
! 164: return nodeList.item(0);
! 165: else
! 166: return null;
! 167: };
! 168: /**
! 169: * <p>Extends the Element to emulate IE's selectNodes.</p>
! 170: * @argument sExpr the XPath expression to use
! 171: * @returns the result of the XPath search as an (Sarissa)NodeList
! 172: * @throws An error if invoked on an HTML Element as this is only be
! 173: * available to XML Elements.
! 174: */
! 175: Element.prototype.selectSingleNode = function(sExpr){
! 176: var doc = this.ownerDocument;
! 177: if(doc.selectSingleNode)
! 178: return doc.selectSingleNode(sExpr, this);
! 179: else
! 180: throw "Method selectNodes is only supported by XML Elements";
! 181: };
! 182: Sarissa.IS_ENABLED_SELECT_NODES = true;
! 183: };
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