compiletemplate.js

function compile (template) {
	function addText (buffer, text, unescaped) {
		unescaped = !!unescaped;
		buffer.push("\tprint(");
		buffer.push(unescaped ? text : "\"" + text
			.split("\r").join("\\r")
			.split("\n").join("\\n")
			.split("\t").join("\\t")
			.split("\"").join("\\\"")
			+ "\""
			);
		buffer.push(");\n");
	}

	function addCode (buffer, code) {
		if (code.indexOf("=") == 0) {
			addText(buffer, code.substring(1, code.length), true);
		} else {
			buffer.push("\t" + code);
		}
	}

	var buffer = [];
	var re = /(<%|%>)/g;
	var prvPos = 0;
	var prvSep = "";
	while (re.test(template)) {
		var curPos = re.lastIndex;
		var curSep = template.substring(curPos - 2, curPos);
		if (curSep == "<%") {
			addText(buffer, template.substring(prvPos, curPos - 2));
		} else { //curSep == "%>"
			addCode(buffer, template.substring(prvPos, curPos - 2));
		}
		prvPos = curPos;
		prvSep = curSep;
	}
	if (prvPos < template.length) {
		if (prvSep == "%>" || prvSep == "") {
			addText(buffer, template.substring(prvPos, template.length));
		} else { //prvSep == "%>"
			addCode(buffer, template.substring(prvPos, template.length));
		}
	}
	var src =
			"	var __output = [];\n" +
			"	var print = function () {\n" +
			"		__output.push.apply(__output, arguments);\n"+
			"	};\n" +
				buffer.join('') +
			"	return(__output.join(''));"
			;
	var template = null;
	try {
		template = new Function("data", src);
		goodCompile = true;
	} catch (ex) {
		printError("Failed to compile template: " + ex);
	}
	return(template);
};