74 lines
1.8 KiB
JavaScript
74 lines
1.8 KiB
JavaScript
var inverseXML = getInverseObj(require("../maps/xml.json")),
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xmlReplacer = getInverseReplacer(inverseXML);
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exports.XML = getInverse(inverseXML, xmlReplacer);
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var inverseHTML = getInverseObj(require("../maps/entities.json")),
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htmlReplacer = getInverseReplacer(inverseHTML);
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exports.HTML = getInverse(inverseHTML, htmlReplacer);
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function getInverseObj(obj){
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return Object.keys(obj).sort().reduce(function(inverse, name){
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inverse[obj[name]] = "&" + name + ";";
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return inverse;
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}, {});
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}
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function getInverseReplacer(inverse){
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var single = [],
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multiple = [];
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Object.keys(inverse).forEach(function(k){
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if(k.length === 1){
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single.push("\\" + k);
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} else {
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multiple.push(k);
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}
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});
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//TODO add ranges
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multiple.unshift("[" + single.join("") + "]");
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return new RegExp(multiple.join("|"), "g");
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}
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var re_nonASCII = /[^\0-\x7F]/g,
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re_astralSymbols = /[\uD800-\uDBFF][\uDC00-\uDFFF]/g;
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function singleCharReplacer(c){
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return "&#x" + c.charCodeAt(0).toString(16).toUpperCase() + ";";
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}
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function astralReplacer(c){
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// http://mathiasbynens.be/notes/javascript-encoding#surrogate-formulae
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var high = c.charCodeAt(0);
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var low = c.charCodeAt(1);
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var codePoint = (high - 0xD800) * 0x400 + low - 0xDC00 + 0x10000;
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return "&#x" + codePoint.toString(16).toUpperCase() + ";";
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}
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function getInverse(inverse, re){
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function func(name){
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return inverse[name];
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}
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return function(data){
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return data
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.replace(re, func)
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.replace(re_astralSymbols, astralReplacer)
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.replace(re_nonASCII, singleCharReplacer);
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};
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}
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var re_xmlChars = getInverseReplacer(inverseXML);
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function escapeXML(data){
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return data
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.replace(re_xmlChars, singleCharReplacer)
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.replace(re_astralSymbols, astralReplacer)
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.replace(re_nonASCII, singleCharReplacer);
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}
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exports.escape = escapeXML;
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