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define(
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[],
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function() {
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var map = {
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"\\{" : "&curlopen;",
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"\\}" : "&curlclose;",
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"&" : "&",
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"\\:" : ":"
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};
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var rev = {
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curlopen : "{",
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curlclose : "}",
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amp : "&",
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colon : ":"
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};
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var espaceString = function(s) {
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if (!s)
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return s;
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return "'" + s.replace(/('|\\)/g, "\\$1").replace("\n","\\n") + "'";
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};
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var encode = function(s) {
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if (!s)
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return s;
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return s.replace(/\\{|\\}|&|\\:|\n/g, function(m) {
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return map[m] || m;
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});
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};
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var decode = function(s) {
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if (!s)
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return s;
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return s.replace(/&(\w+);/g, function(m, $1) {
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return rev[$1] || m;
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});
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};
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var subst = function(s) {
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var i = s.indexOf(":"), name, pattern;
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if (i >= 0) {
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name = s.substr(0, i);
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pattern = s.substr(i + 1);
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} else {
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name = s;
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}
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if (pattern)
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return [
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espaceString(decode(name)),
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espaceString(decode(pattern)) ];
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else
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return [ espaceString(decode(name)) ];
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};
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var compile = function(str) {
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if (!str)
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return function() {};
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var chunks = encode(str).split("{"), chunk;
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var code = [ "var result=[];" ];
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for (var i = 0; i < chunks.length; i++) {
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chunk = chunks[i];
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if (i === 0) {
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if (chunk)
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code.push("result.push(" + espaceString(decode(chunk)) +
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");");
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} else {
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var len = chunk.indexOf("}");
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if (len < 0)
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throw new Error("Unbalanced substitution #" + i);
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code.push("result.push(subst(" +
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subst(chunk.substr(0, len)).join(",") + "));");
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if (chunk.length > len + 1)
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code.push("result.push(" +
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espaceString(decode(chunk.substr(len + 1))) + ");");
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}
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}
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code.push("return result.join('');");
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/* jshint -W054 */
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return new Function("subst", code.join("\n"));
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};
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var cache = {};
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return function(template) {
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var compiled = cache[template];
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if (!compiled) {
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compiled = compile(template);
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cache[template] = compiled;
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}
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return compiled;
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};
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});
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