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define(
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["dojo/request", "./format", "../log/trace!"],
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function (request, format, trace) {
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// разбивает строку шаблона на токены, возвращает контекст для
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// дальнейшей обработки в visitTemplate
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var parseTemplate = function (str) {
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var tokens = str.split(/(<%=|\[%=|<%|\[%|%\]|%>)/);
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var pos = -1;
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var data = [],
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code = [];
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return {
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next: function () {
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pos++;
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return pos < tokens.length;
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},
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token: function () {
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return tokens[pos];
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},
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pushData: function () {
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var i = data.length;
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data.push.apply(data, arguments);
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return i;
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},
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pushCode : function() {
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var i = code.length;
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code.push.apply(code, arguments);
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return i;
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},
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compile: function () {
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var text = "var $p = [];\n" +
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"var print = function(){\n" +
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" $p.push(format.apply(null,arguments));\n" +
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"};\n" +
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// Introduce the data as local variables using with(){}
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"with(obj){\n" +
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code.join("\n") +
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"}\n" +
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"return $p.join('');";
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try {
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var compiled = new Function("obj, format, $data", text);
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/**
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* Функция форматирования по шаблону
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*
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* @type{Function}
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* @param{Object} obj объект с параметрами для подстановки
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*/
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return function (obj) {
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return compiled(obj || {}, format, data);
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};
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} catch (e) {
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trace.error([e]);
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trace.log([text, data]);
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throw e;
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}
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}
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}
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};
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function visitTemplate(context) {
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while (context.next()) {
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switch (context.token()) {
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case "<%":
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case "[%":
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visitCode(context);
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break;
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case "<%=":
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case "[%=":
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visitInline(context);
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break;
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default:
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visitTextFragment(context);
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break;
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}
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}
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}
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function visitInline(context) {
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var code = ["$p.push("];
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while (context.next()) {
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if (context.token() == "%>" || context.token() == "%]")
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break;
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code.push(context.token());
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}
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code.push(");");
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context.pushCode(code.join(''));
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}
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function visitCode(context) {
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var code = [];
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while (context.next()) {
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if (context.token() == "%>" || context.token() == "%]")
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break;
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code.push(context.token());
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}
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context.pushCode(code.join(''));
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}
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function visitTextFragment(context) {
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var i = context.pushData(context.token());
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context.pushCode("$p.push($data["+i+"]);");
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}
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var compile = function (str) {
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if (!str)
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return function() { return "";};
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var ctx = parseTemplate(str);
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visitTemplate(ctx);
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return ctx.compile();
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};
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var cache = {};
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compile.load = function (id, require, callback) {
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var url = require.toUrl(id);
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if (url in cache) {
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callback(cache[url]);
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} else {
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request(url).then(compile).then(function (tc) {
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callback(cache[url] = tc);
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}, function (err) {
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require.signal("error", [{
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error: err,
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src: 'implab/text/template-compile'
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}]);
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});
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}
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};
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return compile;
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});
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