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536 lines
14 KiB
536 lines
14 KiB
/*!
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* mustache.js - Logic-less {{mustache}} templates with JavaScript
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* http://github.com/janl/mustache.js
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*/
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var Mustache = (typeof module !== "undefined" && module.exports) || {};
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(function (exports) {
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exports.name = "mustache.js";
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exports.version = "0.5.0-dev";
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exports.tags = ["{{", "}}"];
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exports.parse = parse;
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exports.compile = compile;
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exports.render = render;
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exports.clearCache = clearCache;
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// This is here for backwards compatibility with 0.4.x.
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exports.to_html = function (template, view, partials, send) {
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var result = render(template, view, partials);
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if (typeof send === "function") {
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send(result);
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} else {
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return result;
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}
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};
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var _toString = Object.prototype.toString;
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var _isArray = Array.isArray;
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var _forEach = Array.prototype.forEach;
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var _trim = String.prototype.trim;
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var isArray;
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if (_isArray) {
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isArray = _isArray;
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} else {
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isArray = function (obj) {
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return _toString.call(obj) === "[object Array]";
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};
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}
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var forEach;
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if (_forEach) {
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forEach = function (obj, callback, scope) {
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return _forEach.call(obj, callback, scope);
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};
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} else {
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forEach = function (obj, callback, scope) {
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for (var i = 0, len = obj.length; i < len; ++i) {
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callback.call(scope, obj[i], i, obj);
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}
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};
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}
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var spaceRe = /^\s*$/;
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function isWhitespace(string) {
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return spaceRe.test(string);
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}
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var trim;
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if (_trim) {
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trim = function (string) {
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return string == null ? "" : _trim.call(string);
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};
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} else {
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var trimLeft, trimRight;
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if (isWhitespace("\xA0")) {
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trimLeft = /^\s+/;
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trimRight = /\s+$/;
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} else {
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// IE doesn't match non-breaking spaces with \s, thanks jQuery.
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trimLeft = /^[\s\xA0]+/;
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trimRight = /[\s\xA0]+$/;
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}
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trim = function (string) {
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return string == null ? "" :
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String(string).replace(trimLeft, "").replace(trimRight, "");
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};
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}
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var escapeMap = {
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"&": "&",
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"<": "<",
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">": ">",
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'"': '"',
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"'": '''
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};
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function escapeHTML(string) {
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return String(string).replace(/&(?!\w+;)|[<>"']/g, function (s) {
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return escapeMap[s] || s;
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});
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}
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/**
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* Adds the `template`, `line`, and `file` properties to the given error
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* object and alters the message to provide more useful debugging information.
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*/
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function debug(e, template, line, file) {
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file = file || "<template>";
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var lines = template.split("\n"),
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start = Math.max(line - 3, 0),
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end = Math.min(lines.length, line + 3),
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context = lines.slice(start, end);
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var c;
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for (var i = 0, len = context.length; i < len; ++i) {
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c = i + start + 1;
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context[i] = (c === line ? " >> " : " ") + context[i];
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}
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e.template = template;
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e.line = line;
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e.file = file;
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e.message = [file + ":" + line, context.join("\n"), "", e.message].join("\n");
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return e;
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}
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/**
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* Looks up the value of the given `name` in the given context `stack`.
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*/
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function lookup(name, stack, defaultValue) {
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if (name === ".") {
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return stack[stack.length - 1];
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}
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var names = name.split(".");
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var lastIndex = names.length - 1;
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var target = names[lastIndex];
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var value, context, i = stack.length, j, localStack;
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while (i) {
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localStack = stack.slice(0);
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context = stack[--i];
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j = 0;
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while (j < lastIndex) {
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context = context[names[j++]];
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if (context == null) {
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break;
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}
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localStack.push(context);
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}
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if (context && target in context) {
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value = context[target];
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break;
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}
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}
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// If the value is a function, call it in the current context.
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if (typeof value === "function") {
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value = value.call(localStack[localStack.length - 1]);
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}
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if (value == null) {
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return defaultValue;
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}
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return value;
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}
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function renderSection(name, stack, callback, inverted) {
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var buffer = "";
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var value = lookup(name, stack);
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if (inverted) {
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// From the spec: inverted sections may render text once based on the
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// inverse value of the key. That is, they will be rendered if the key
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// doesn't exist, is false, or is an empty list.
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if (value == null || value === false || (isArray(value) && value.length === 0)) {
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buffer += callback();
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}
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} else if (isArray(value)) {
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forEach(value, function (value) {
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stack.push(value);
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buffer += callback();
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stack.pop();
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});
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} else if (typeof value === "object") {
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stack.push(value);
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buffer += callback();
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stack.pop();
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} else if (typeof value === "function") {
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var scope = stack[stack.length - 1];
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var scopedRender = function (template) {
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return render(template, scope);
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};
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buffer += value.call(scope, callback(), scopedRender) || "";
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} else if (value) {
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buffer += callback();
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}
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return buffer;
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}
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/**
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* Parses the given `template` and returns the source of a function that,
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* with the proper arguments, will render the template. Recognized options
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* include the following:
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*
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* - file The name of the file the template comes from (displayed in
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* error messages)
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* - tags An array of open and close tags the `template` uses. Defaults
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* to the value of Mustache.tags
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* - debug Set `true` to log the body of the generated function to the
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* console
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* - space Set `true` to preserve whitespace from lines that otherwise
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* contain only a {{tag}}. Defaults to `false`
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*/
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function parse(template, options) {
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options = options || {};
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var tags = options.tags || exports.tags,
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openTag = tags[0],
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closeTag = tags[tags.length - 1];
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var code = [
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'var buffer = "";', // output buffer
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"\nvar line = 1;", // keep track of source line number
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"\ntry {",
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'\nbuffer += "'
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];
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var spaces = [], // indices of whitespace in code on the current line
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hasTag = false, // is there a {{tag}} on the current line?
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nonSpace = false; // is there a non-space char on the current line?
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// Strips all space characters from the code array for the current line
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// if there was a {{tag}} on it and otherwise only spaces.
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var stripSpace = function () {
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if (hasTag && !nonSpace && !options.space) {
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while (spaces.length) {
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code.splice(spaces.pop(), 1);
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}
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} else {
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spaces = [];
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}
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hasTag = false;
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nonSpace = false;
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};
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var sectionStack = [], updateLine, nextOpenTag, nextCloseTag;
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var setTags = function (source) {
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tags = trim(source).split(/\s+/);
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nextOpenTag = tags[0];
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nextCloseTag = tags[tags.length - 1];
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};
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var includePartial = function (source) {
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code.push(
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'";',
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updateLine,
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'\nvar partial = partials["' + trim(source) + '"];',
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'\nif (partial) {',
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'\n buffer += render(partial,stack[stack.length - 1],partials);',
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'\n}',
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'\nbuffer += "'
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);
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};
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var openSection = function (source, inverted) {
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var name = trim(source);
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if (name === "") {
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throw debug(new Error("Section name may not be empty"), template, line, options.file);
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}
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sectionStack.push({name: name, inverted: inverted});
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code.push(
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'";',
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updateLine,
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'\nvar name = "' + name + '";',
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'\nvar callback = (function () {',
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'\n return function () {',
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'\n var buffer = "";',
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'\nbuffer += "'
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);
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};
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var openInvertedSection = function (source) {
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openSection(source, true);
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};
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var closeSection = function (source) {
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var name = trim(source);
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var openName = sectionStack.length != 0 && sectionStack[sectionStack.length - 1].name;
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if (!openName || name != openName) {
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throw debug(new Error('Section named "' + name + '" was never opened'), template, line, options.file);
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}
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var section = sectionStack.pop();
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code.push(
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'";',
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'\n return buffer;',
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'\n };',
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'\n})();'
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);
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if (section.inverted) {
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code.push("\nbuffer += renderSection(name,stack,callback,true);");
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} else {
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code.push("\nbuffer += renderSection(name,stack,callback);");
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}
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code.push('\nbuffer += "');
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};
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var sendPlain = function (source) {
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code.push(
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'";',
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updateLine,
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'\nbuffer += lookup("' + trim(source) + '",stack,"");',
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'\nbuffer += "'
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);
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};
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var sendEscaped = function (source) {
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code.push(
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'";',
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updateLine,
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'\nbuffer += escapeHTML(lookup("' + trim(source) + '",stack,""));',
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'\nbuffer += "'
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);
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};
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var line = 1, c, callback;
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for (var i = 0, len = template.length; i < len; ++i) {
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if (template.slice(i, i + openTag.length) === openTag) {
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i += openTag.length;
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c = template.substr(i, 1);
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updateLine = '\nline = ' + line + ';';
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nextOpenTag = openTag;
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nextCloseTag = closeTag;
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hasTag = true;
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switch (c) {
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case "!": // comment
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i++;
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callback = null;
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break;
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case "=": // change open/close tags, e.g. {{=<% %>=}}
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i++;
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closeTag = "=" + closeTag;
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callback = setTags;
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break;
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case ">": // include partial
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i++;
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callback = includePartial;
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break;
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case "#": // start section
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i++;
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callback = openSection;
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break;
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case "^": // start inverted section
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i++;
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callback = openInvertedSection;
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break;
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case "/": // end section
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i++;
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callback = closeSection;
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break;
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case "{": // plain variable
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closeTag = "}" + closeTag;
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// fall through
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case "&": // plain variable
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i++;
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nonSpace = true;
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callback = sendPlain;
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break;
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default: // escaped variable
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nonSpace = true;
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callback = sendEscaped;
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}
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var end = template.indexOf(closeTag, i);
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if (end === -1) {
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throw debug(new Error('Tag "' + openTag + '" was not closed properly'), template, line, options.file);
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}
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var source = template.substring(i, end);
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if (callback) {
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callback(source);
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}
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// Maintain line count for \n in source.
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var n = 0;
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while (~(n = source.indexOf("\n", n))) {
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line++;
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n++;
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}
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i = end + closeTag.length - 1;
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openTag = nextOpenTag;
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closeTag = nextCloseTag;
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} else {
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c = template.substr(i, 1);
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switch (c) {
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case '"':
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case "\\":
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nonSpace = true;
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code.push("\\" + c);
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break;
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case "\r":
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// Ignore carriage returns.
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break;
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case "\n":
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spaces.push(code.length);
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code.push("\\n");
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stripSpace(); // Check for whitespace on the current line.
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line++;
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break;
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default:
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if (isWhitespace(c)) {
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spaces.push(code.length);
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} else {
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nonSpace = true;
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}
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code.push(c);
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}
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}
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}
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if (sectionStack.length != 0) {
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throw debug(new Error('Section "' + sectionStack[sectionStack.length - 1].name + '" was not closed properly'), template, line, options.file);
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}
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// Clean up any whitespace from a closing {{tag}} that was at the end
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// of the template without a trailing \n.
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stripSpace();
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code.push(
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'";',
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"\nreturn buffer;",
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"\n} catch (e) { throw {error: e, line: line}; }"
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);
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// Ignore `buffer += "";` statements.
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var body = code.join("").replace(/buffer \+= "";\n/g, "");
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if (options.debug) {
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if (typeof console != "undefined" && console.log) {
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console.log(body);
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} else if (typeof print === "function") {
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print(body);
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}
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}
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return body;
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}
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/**
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* Used by `compile` to generate a reusable function for the given `template`.
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*/
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function _compile(template, options) {
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var args = "view,partials,stack,lookup,escapeHTML,renderSection,render";
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var body = parse(template, options);
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var fn = new Function(args, body);
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// This anonymous function wraps the generated function so we can do
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// argument coercion, setup some variables, and handle any errors
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// encountered while executing it.
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return function (view, partials) {
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partials = partials || {};
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var stack = [view]; // context stack
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try {
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return fn(view, partials, stack, lookup, escapeHTML, renderSection, render);
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} catch (e) {
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throw debug(e.error, template, e.line, options.file);
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}
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};
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}
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// Cache of pre-compiled templates.
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var _cache = {};
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/**
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* Clear the cache of compiled templates.
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*/
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function clearCache() {
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_cache = {};
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}
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/**
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* Compiles the given `template` into a reusable function using the given
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* `options`. In addition to the options accepted by Mustache.parse,
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* recognized options include the following:
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*
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* - cache Set `false` to bypass any pre-compiled version of the given
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* template. Otherwise, a given `template` string will be cached
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* the first time it is parsed
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*/
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function compile(template, options) {
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options = options || {};
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// Use a pre-compiled version from the cache if we have one.
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if (options.cache !== false) {
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if (!_cache[template]) {
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_cache[template] = _compile(template, options);
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}
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return _cache[template];
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}
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return _compile(template, options);
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}
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|
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/**
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* High-level function that renders the given `template` using the given
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* `view` and `partials`. If you need to use any of the template options (see
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* `compile` above), you must compile in a separate step, and then call that
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* compiled function.
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*/
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function render(template, view, partials) {
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return compile(template)(view, partials);
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}
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})(Mustache);
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