1 var assignOwnDefaults = require('../internal/assignOwnDefaults'),
2 assignWith = require('../internal/assignWith'),
3 attempt = require('../utility/attempt'),
4 baseAssign = require('../internal/baseAssign'),
5 baseToString = require('../internal/baseToString'),
6 baseValues = require('../internal/baseValues'),
7 escapeStringChar = require('../internal/escapeStringChar'),
8 isError = require('../lang/isError'),
9 isIterateeCall = require('../internal/isIterateeCall'),
10 keys = require('../object/keys'),
11 reInterpolate = require('../internal/reInterpolate'),
12 templateSettings = require('./templateSettings');
14 /** Used to match empty string literals in compiled template source. */
15 var reEmptyStringLeading = /\b__p \+= '';/g,
16 reEmptyStringMiddle = /\b(__p \+=) '' \+/g,
17 reEmptyStringTrailing = /(__e\(.*?\)|\b__t\)) \+\n'';/g;
19 /** Used to match [ES template delimiters](http://ecma-international.org/ecma-262/6.0/#sec-template-literal-lexical-components). */
20 var reEsTemplate = /\$\{([^\\}]*(?:\\.[^\\}]*)*)\}/g;
22 /** Used to ensure capturing order of template delimiters. */
23 var reNoMatch = /($^)/;
25 /** Used to match unescaped characters in compiled string literals. */
26 var reUnescapedString = /['\n\r\u2028\u2029\\]/g;
29 * Creates a compiled template function that can interpolate data properties
30 * in "interpolate" delimiters, HTML-escape interpolated data properties in
31 * "escape" delimiters, and execute JavaScript in "evaluate" delimiters. Data
32 * properties may be accessed as free variables in the template. If a setting
33 * object is provided it takes precedence over `_.templateSettings` values.
35 * **Note:** In the development build `_.template` utilizes
36 * [sourceURLs](http://www.html5rocks.com/en/tutorials/developertools/sourcemaps/#toc-sourceurl)
37 * for easier debugging.
39 * For more information on precompiling templates see
40 * [lodash's custom builds documentation](https://lodash.com/custom-builds).
42 * For more information on Chrome extension sandboxes see
43 * [Chrome's extensions documentation](https://developer.chrome.com/extensions/sandboxingEval).
48 * @param {string} [string=''] The template string.
49 * @param {Object} [options] The options object.
50 * @param {RegExp} [options.escape] The HTML "escape" delimiter.
51 * @param {RegExp} [options.evaluate] The "evaluate" delimiter.
52 * @param {Object} [options.imports] An object to import into the template as free variables.
53 * @param {RegExp} [options.interpolate] The "interpolate" delimiter.
54 * @param {string} [options.sourceURL] The sourceURL of the template's compiled source.
55 * @param {string} [options.variable] The data object variable name.
56 * @param- {Object} [otherOptions] Enables the legacy `options` param signature.
57 * @returns {Function} Returns the compiled template function.
60 * // using the "interpolate" delimiter to create a compiled template
61 * var compiled = _.template('hello <%= user %>!');
62 * compiled({ 'user': 'fred' });
65 * // using the HTML "escape" delimiter to escape data property values
66 * var compiled = _.template('<b><%- value %></b>');
67 * compiled({ 'value': '<script>' });
68 * // => '<b><script></b>'
70 * // using the "evaluate" delimiter to execute JavaScript and generate HTML
71 * var compiled = _.template('<% _.forEach(users, function(user) { %><li><%- user %></li><% }); %>');
72 * compiled({ 'users': ['fred', 'barney'] });
73 * // => '<li>fred</li><li>barney</li>'
75 * // using the internal `print` function in "evaluate" delimiters
76 * var compiled = _.template('<% print("hello " + user); %>!');
77 * compiled({ 'user': 'barney' });
78 * // => 'hello barney!'
80 * // using the ES delimiter as an alternative to the default "interpolate" delimiter
81 * var compiled = _.template('hello ${ user }!');
82 * compiled({ 'user': 'pebbles' });
83 * // => 'hello pebbles!'
85 * // using custom template delimiters
86 * _.templateSettings.interpolate = /{{([\s\S]+?)}}/g;
87 * var compiled = _.template('hello {{ user }}!');
88 * compiled({ 'user': 'mustache' });
89 * // => 'hello mustache!'
91 * // using backslashes to treat delimiters as plain text
92 * var compiled = _.template('<%= "\\<%- value %\\>" %>');
93 * compiled({ 'value': 'ignored' });
94 * // => '<%- value %>'
96 * // using the `imports` option to import `jQuery` as `jq`
97 * var text = '<% jq.each(users, function(user) { %><li><%- user %></li><% }); %>';
98 * var compiled = _.template(text, { 'imports': { 'jq': jQuery } });
99 * compiled({ 'users': ['fred', 'barney'] });
100 * // => '<li>fred</li><li>barney</li>'
102 * // using the `sourceURL` option to specify a custom sourceURL for the template
103 * var compiled = _.template('hello <%= user %>!', { 'sourceURL': '/basic/greeting.jst' });
105 * // => find the source of "greeting.jst" under the Sources tab or Resources panel of the web inspector
107 * // using the `variable` option to ensure a with-statement isn't used in the compiled template
108 * var compiled = _.template('hi <%= data.user %>!', { 'variable': 'data' });
110 * // => function(data) {
111 * // var __t, __p = '';
112 * // __p += 'hi ' + ((__t = ( data.user )) == null ? '' : __t) + '!';
116 * // using the `source` property to inline compiled templates for meaningful
117 * // line numbers in error messages and a stack trace
118 * fs.writeFileSync(path.join(cwd, 'jst.js'), '\
120 * "main": ' + _.template(mainText).source + '\
124 function template(string, options, otherOptions) {
125 // Based on John Resig's `tmpl` implementation (http://ejohn.org/blog/javascript-micro-templating/)
126 // and Laura Doktorova's doT.js (https://github.com/olado/doT).
127 var settings = templateSettings.imports._.templateSettings || templateSettings;
129 if (otherOptions && isIterateeCall(string, options, otherOptions)) {
130 options = otherOptions = undefined;
132 string = baseToString(string);
133 options = assignWith(baseAssign({}, otherOptions || options), settings, assignOwnDefaults);
135 var imports = assignWith(baseAssign({}, options.imports), settings.imports, assignOwnDefaults),
136 importsKeys = keys(imports),
137 importsValues = baseValues(imports, importsKeys);
142 interpolate = options.interpolate || reNoMatch,
145 // Compile the regexp to match each delimiter.
146 var reDelimiters = RegExp(
147 (options.escape || reNoMatch).source + '|' +
148 interpolate.source + '|' +
149 (interpolate === reInterpolate ? reEsTemplate : reNoMatch).source + '|' +
150 (options.evaluate || reNoMatch).source + '|$'
153 // Use a sourceURL for easier debugging.
154 var sourceURL = 'sourceURL' in options ? '//# sourceURL=' + options.sourceURL + '\n' : '';
156 string.replace(reDelimiters, function(match, escapeValue, interpolateValue, esTemplateValue, evaluateValue, offset) {
157 interpolateValue || (interpolateValue = esTemplateValue);
159 // Escape characters that can't be included in string literals.
160 source += string.slice(index, offset).replace(reUnescapedString, escapeStringChar);
162 // Replace delimiters with snippets.
165 source += "' +\n__e(" + escapeValue + ") +\n'";
169 source += "';\n" + evaluateValue + ";\n__p += '";
171 if (interpolateValue) {
172 source += "' +\n((__t = (" + interpolateValue + ")) == null ? '' : __t) +\n'";
174 index = offset + match.length;
176 // The JS engine embedded in Adobe products requires returning the `match`
177 // string in order to produce the correct `offset` value.
183 // If `variable` is not specified wrap a with-statement around the generated
184 // code to add the data object to the top of the scope chain.
185 var variable = options.variable;
187 source = 'with (obj) {\n' + source + '\n}\n';
189 // Cleanup code by stripping empty strings.
190 source = (isEvaluating ? source.replace(reEmptyStringLeading, '') : source)
191 .replace(reEmptyStringMiddle, '$1')
192 .replace(reEmptyStringTrailing, '$1;');
194 // Frame code as the function body.
195 source = 'function(' + (variable || 'obj') + ') {\n' +
198 : 'obj || (obj = {});\n'
200 "var __t, __p = ''" +
206 ? ', __j = Array.prototype.join;\n' +
207 "function print() { __p += __j.call(arguments, '') }\n"
213 var result = attempt(function() {
214 return Function(importsKeys, sourceURL + 'return ' + source).apply(undefined, importsValues);
217 // Provide the compiled function's source by its `toString` method or
218 // the `source` property as a convenience for inlining compiled templates.
219 result.source = source;
220 if (isError(result)) {
226 module.exports = template;