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jsonml-xml.js
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jsonml-xml.js
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/*global ActiveXObject */
/*
jsonml-xml.js
JsonML XML utilities
Created: 2007-02-15-2235
Modified: 2012-11-03-2051
Copyright (c)2006-2012 Stephen M. McKamey
Distributed under The MIT License: http://jsonml.org/license
This file creates a global JsonML object containing these methods:
JsonML.toXML(string|array, filter)
Converts JsonML to XML nodes
JsonML.toXMLText(JsonML, filter)
Converts JsonML to XML text
JsonML.fromXML(node, filter)
Converts XML nodes to JsonML
JsonML.fromXMLText(xmlText, filter)
Converts XML text to JsonML
*/
var JsonML = JsonML || {};
if (typeof module === 'object') {
module.exports = JsonML;
}
(function(JsonML, document) {
'use strict';
/**
* Determines if the value is an Array
*
* @private
* @param {*} val the object being tested
* @return {boolean}
*/
var isArray = Array.isArray || function(val) {
return (val instanceof Array);
};
/**
* Creates a DOM element
*
* @private
* @param {string} tag The element's tag name
* @return {Node}
*/
var createElement = function(tag) {
if (!tag) {
// create a document fragment to hold multiple-root elements
if (document.createDocumentFragment) {
return document.createDocumentFragment();
}
tag = '';
} else if (tag.charAt(0) === '!') {
return document.createComment(tag === '!' ? '' : tag.substr(1)+' ');
}
return document.createElement(tag);
};
/**
* Appends an attribute to an element
*
* @private
* @param {Node} elem The element
* @param {Object} attr Attributes object
* @return {Node}
*/
var addAttributes = function(elem, attr) {
// for each attributeName
for (var name in attr) {
if (attr.hasOwnProperty(name)) {
// attributes
elem.setAttribute(name, attr[name]);
}
}
return elem;
};
/**
* Appends a child to an element
*
* @private
* @param {Node} elem The parent element
* @param {Node} child The child
*/
var appendDOM = function(elem, child) {
if (child) {
if (elem.nodeType === 8) { // comment
if (child.nodeType === 3) { // text node
elem.nodeValue += child.nodeValue;
}
} else if (elem.canHaveChildren !== false) {
elem.appendChild(child);
}
}
};
/**
* Default error handler
* @param {Error} ex
* @return {Node}
*/
var onError = function (ex) {
return document.createTextNode('['+ex+']');
};
/* override this to perform custom error handling during binding */
JsonML.onerror = null;
/**
* @param {Node} elem
* @param {*} jml
* @param {function} filter
* @return {Node}
*/
var patch = function(elem, jml, filter) {
for (var i=1; i<jml.length; i++) {
if (isArray(jml[i]) || 'string' === typeof jml[i]) {
// append children
appendDOM(elem, toXML(jml[i], filter));
} else if ('object' === typeof jml[i] && jml[i] !== null && elem.nodeType === 1) {
// add attributes
elem = addAttributes(elem, jml[i]);
}
}
return elem;
};
/**
* Main builder entry point
* @param {string|array} jml
* @param {function} filter
* @return {Node}
*/
var toXML = JsonML.toXML = function(jml, filter) {
try {
if (!jml) {
return null;
}
if ('string' === typeof jml) {
return document.createTextNode(jml);
}
if (!isArray(jml) || ('string' !== typeof jml[0])) {
throw new SyntaxError('invalid JsonML');
}
var tagName = jml[0]; // tagName
if (!tagName) {
// correctly handle a list of JsonML trees
// create a document fragment to hold elements
var frag = createElement('');
for (var i=1; i<jml.length; i++) {
appendDOM(frag, toXML(jml[i], filter));
}
// eliminate wrapper for single nodes
if (frag.childNodes.length === 1) {
return frag.firstChild;
}
return frag;
}
var elem = patch(createElement(tagName), jml, filter);
return (elem && 'function' === typeof filter) ? filter(elem) : elem;
} catch (ex) {
try {
// handle error with complete context
var err = ('function' === typeof JsonML.onerror) ? JsonML.onerror : onError;
return err(ex, jml, filter);
} catch (ex2) {
return document.createTextNode('['+ex2+']');
}
}
};
/**
* Converts JsonML to XML text
* @param {string|array} jml
* @param {function} filter
* @return {array} JsonML
*/
JsonML.toXMLText = function(jml, filter) {
return renderXML( toXML(jml, filter) );
};
/* Reverse conversion -------------------------*/
var addChildren = function(/*DOM*/ elem, /*function*/ filter, /*JsonML*/ jml) {
if (elem.hasChildNodes()) {
for (var i=0, len=elem.childNodes.length; i<len; i++) {
var child = elem.childNodes[i];
child = fromXML(child, filter);
if (child) {
jml.push(child);
}
}
return true;
}
return false;
};
/**
* @param {Node} elem
* @param {function} filter
* @return {string|array} JsonML
*/
var fromXML = JsonML.fromXML = function(elem, filter) {
if (!elem || !elem.nodeType) {
// free references
return (elem = null);
}
var i, jml;
switch (elem.nodeType) {
case 1: // element
case 9: // document
case 11: // documentFragment
jml = [elem.tagName||''];
var attr = elem.attributes,
props = {},
hasAttrib = false;
for (i=0; attr && i<attr.length; i++) {
if (attr[i].specified) {
if ('string' === typeof attr[i].value) {
props[attr[i].name] = attr[i].value;
}
hasAttrib = true;
}
}
if (hasAttrib) {
jml.push(props);
}
addChildren(elem, filter, jml);
// filter result
if ('function' === typeof filter) {
jml = filter(jml, elem);
}
// free references
elem = null;
return jml;
case 3: // text node
case 4: // CDATA node
var str = String(elem.nodeValue);
// free references
elem = null;
return str;
case 10: // doctype
jml = ['!'];
var type = ['DOCTYPE', (elem.name || 'html').toLowerCase()];
if (elem.publicId) {
type.push('PUBLIC', '"' + elem.publicId + '"');
}
if (elem.systemId) {
type.push('"' + elem.systemId + '"');
}
jml.push(type.join(' '));
// filter result
if ('function' === typeof filter) {
jml = filter(jml, elem);
}
// free references
elem = null;
return jml;
case 8: // comment node
if ((elem.nodeValue||'').indexOf('DOCTYPE') !== 0) {
// free references
elem = null;
return null;
}
jml = ['!',
elem.nodeValue];
// filter result
if ('function' === typeof filter) {
jml = filter(jml, elem);
}
// free references
elem = null;
return jml;
default: // etc.
if (window.console) {
window.console.log('nodeType '+elem.nodeType+' skipped.');
}
// free references
return (elem = null);
}
};
/**
* Converts XML text to XML DOM nodes
* https://developer.mozilla.org/en-US/docs/Parsing_and_serializing_XML
* https://gist.github.com/553364
* @param {string} xmlText
* @return {Node} xml node
*/
var parseXML = JsonML.parseXML = function(xmlText) {
if (!xmlText || typeof xmlText !== 'string') {
return null;
}
if (window.DOMParser) {
// standard XML DOM
return new DOMParser().parseFromString(xmlText, 'application/xml');
}
if (window.ActiveXObject) {
// legacy IE XML DOM
var xml = new ActiveXObject('Microsoft.XMLDOM');
xml.async = 'false';
xml.loadXML(xmlText);
return xml;
}
/*
// this doesn't seem to work in any browser yet
if (window.XMLHttpRequest){
var xhr = new XMLHttpRequest();
xhr.open('GET', 'data:application/xml;charset=utf-8,'+encodeURIComponent(xmlText), false);
if (xhr.overrideMimeType) {
xhr.overrideMimeType('application/xml');
}
xhr.send('');
return xhr.responseXML;
}
*/
return null;
};
/**
* Converts XML text nodes to JsonML
* @param {string} xmlText
* @param {function} filter
* @return {string|array} JsonML
*/
JsonML.fromXMLText = function(xmlText, filter) {
var elem = parseXML(xmlText);
elem = elem && (elem.ownerDocument || elem).documentElement;
return fromXML(elem, filter);
};
/**
* Converts XML DOM nodes to XML text
* https://developer.mozilla.org/en-US/docs/Parsing_and_serializing_XML
* @param {string} xmlText
* @return {string|array} JsonML
*/
var renderXML = JsonML.renderXML = function(elem) {
if (!elem) {
return null;
}
if (window.XMLSerializer) {
// standard XML DOM
return new window.XMLSerializer().serializeToString(elem);
}
// legacy IE XML
if (elem.xml) {
return elem.xml;
}
// HTML DOM
if (elem.outerHTML) {
return elem.outerHTML;
}
var parent = createElement('div');
parent.appendChild(elem);
var html = parent.innerHTML;
parent.removeChild(elem);
return html;
};
JsonML.isXML = function(elem) {
var root = elem && (elem.ownerDocument || elem).documentElement;
return !!root && (root.nodeName !== "HTML");
};
// enable usage of XML DOM, fallback to HTML DOM
document = parseXML('<xml/>') || document;
})(JsonML, document);