217 lines
8.1 KiB
JavaScript
217 lines
8.1 KiB
JavaScript
/**
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* Lo-Dash 2.4.1 (Custom Build) <http://lodash.com/>
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* Build: `lodash modularize modern exports="npm" -o ./npm/`
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* Copyright 2012-2013 The Dojo Foundation <http://dojofoundation.org/>
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* Based on Underscore.js 1.5.2 <http://underscorejs.org/LICENSE>
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* Copyright 2009-2013 Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
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* Available under MIT license <http://lodash.com/license>
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*/
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var defaults = require('lodash.defaults'),
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escape = require('lodash.escape'),
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escapeStringChar = require('lodash._escapestringchar'),
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keys = require('lodash.keys'),
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reInterpolate = require('lodash._reinterpolate'),
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templateSettings = require('lodash.templatesettings'),
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values = require('lodash.values');
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/** Used to match empty string literals in compiled template source */
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var reEmptyStringLeading = /\b__p \+= '';/g,
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reEmptyStringMiddle = /\b(__p \+=) '' \+/g,
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reEmptyStringTrailing = /(__e\(.*?\)|\b__t\)) \+\n'';/g;
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/**
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* Used to match ES6 template delimiters
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* http://people.mozilla.org/~jorendorff/es6-draft.html#sec-literals-string-literals
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*/
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var reEsTemplate = /\$\{([^\\}]*(?:\\.[^\\}]*)*)\}/g;
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/** Used to ensure capturing order of template delimiters */
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var reNoMatch = /($^)/;
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/** Used to match unescaped characters in compiled string literals */
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var reUnescapedString = /['\n\r\t\u2028\u2029\\]/g;
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/**
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* A micro-templating method that handles arbitrary delimiters, preserves
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* whitespace, and correctly escapes quotes within interpolated code.
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*
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* Note: In the development build, `_.template` utilizes sourceURLs for easier
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* debugging. See http://www.html5rocks.com/en/tutorials/developertools/sourcemaps/#toc-sourceurl
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*
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* For more information on precompiling templates see:
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* http://lodash.com/custom-builds
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*
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* For more information on Chrome extension sandboxes see:
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* http://developer.chrome.com/stable/extensions/sandboxingEval.html
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*
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* @static
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* @memberOf _
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* @category Utilities
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* @param {string} text The template text.
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* @param {Object} data The data object used to populate the text.
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* @param {Object} [options] The options object.
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* @param {RegExp} [options.escape] The "escape" delimiter.
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* @param {RegExp} [options.evaluate] The "evaluate" delimiter.
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* @param {Object} [options.imports] An object to import into the template as local variables.
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* @param {RegExp} [options.interpolate] The "interpolate" delimiter.
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* @param {string} [sourceURL] The sourceURL of the template's compiled source.
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* @param {string} [variable] The data object variable name.
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* @returns {Function|string} Returns a compiled function when no `data` object
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* is given, else it returns the interpolated text.
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* @example
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*
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* // using the "interpolate" delimiter to create a compiled template
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* var compiled = _.template('hello <%= name %>');
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* compiled({ 'name': 'fred' });
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* // => 'hello fred'
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*
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* // using the "escape" delimiter to escape HTML in data property values
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* _.template('<b><%- value %></b>', { 'value': '<script>' });
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* // => '<b><script></b>'
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*
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* // using the "evaluate" delimiter to generate HTML
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* var list = '<% _.forEach(people, function(name) { %><li><%- name %></li><% }); %>';
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* _.template(list, { 'people': ['fred', 'barney'] });
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* // => '<li>fred</li><li>barney</li>'
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*
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* // using the ES6 delimiter as an alternative to the default "interpolate" delimiter
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* _.template('hello ${ name }', { 'name': 'pebbles' });
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* // => 'hello pebbles'
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*
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* // using the internal `print` function in "evaluate" delimiters
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* _.template('<% print("hello " + name); %>!', { 'name': 'barney' });
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* // => 'hello barney!'
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*
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* // using a custom template delimiters
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* _.templateSettings = {
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* 'interpolate': /{{([\s\S]+?)}}/g
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* };
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*
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* _.template('hello {{ name }}!', { 'name': 'mustache' });
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* // => 'hello mustache!'
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*
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* // using the `imports` option to import jQuery
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* var list = '<% jq.each(people, function(name) { %><li><%- name %></li><% }); %>';
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* _.template(list, { 'people': ['fred', 'barney'] }, { 'imports': { 'jq': jQuery } });
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* // => '<li>fred</li><li>barney</li>'
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*
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* // using the `sourceURL` option to specify a custom sourceURL for the template
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* var compiled = _.template('hello <%= name %>', null, { 'sourceURL': '/basic/greeting.jst' });
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* compiled(data);
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* // => find the source of "greeting.jst" under the Sources tab or Resources panel of the web inspector
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*
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* // using the `variable` option to ensure a with-statement isn't used in the compiled template
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* var compiled = _.template('hi <%= data.name %>!', null, { 'variable': 'data' });
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* compiled.source;
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* // => function(data) {
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* var __t, __p = '', __e = _.escape;
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* __p += 'hi ' + ((__t = ( data.name )) == null ? '' : __t) + '!';
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* return __p;
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* }
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*
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* // using the `source` property to inline compiled templates for meaningful
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* // line numbers in error messages and a stack trace
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* fs.writeFileSync(path.join(cwd, 'jst.js'), '\
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* var JST = {\
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* "main": ' + _.template(mainText).source + '\
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* };\
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* ');
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*/
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function template(text, data, options) {
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// based on John Resig's `tmpl` implementation
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// http://ejohn.org/blog/javascript-micro-templating/
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// and Laura Doktorova's doT.js
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// https://github.com/olado/doT
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var settings = templateSettings.imports._.templateSettings || templateSettings;
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text = String(text || '');
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// avoid missing dependencies when `iteratorTemplate` is not defined
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options = defaults({}, options, settings);
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var imports = defaults({}, options.imports, settings.imports),
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importsKeys = keys(imports),
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importsValues = values(imports);
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var isEvaluating,
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index = 0,
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interpolate = options.interpolate || reNoMatch,
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source = "__p += '";
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// compile the regexp to match each delimiter
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var reDelimiters = RegExp(
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(options.escape || reNoMatch).source + '|' +
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interpolate.source + '|' +
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(interpolate === reInterpolate ? reEsTemplate : reNoMatch).source + '|' +
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(options.evaluate || reNoMatch).source + '|$'
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, 'g');
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text.replace(reDelimiters, function(match, escapeValue, interpolateValue, esTemplateValue, evaluateValue, offset) {
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interpolateValue || (interpolateValue = esTemplateValue);
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// escape characters that cannot be included in string literals
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source += text.slice(index, offset).replace(reUnescapedString, escapeStringChar);
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// replace delimiters with snippets
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if (escapeValue) {
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source += "' +\n__e(" + escapeValue + ") +\n'";
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}
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if (evaluateValue) {
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isEvaluating = true;
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source += "';\n" + evaluateValue + ";\n__p += '";
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}
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if (interpolateValue) {
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source += "' +\n((__t = (" + interpolateValue + ")) == null ? '' : __t) +\n'";
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}
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index = offset + match.length;
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// the JS engine embedded in Adobe products requires returning the `match`
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// string in order to produce the correct `offset` value
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return match;
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});
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source += "';\n";
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// if `variable` is not specified, wrap a with-statement around the generated
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// code to add the data object to the top of the scope chain
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var variable = options.variable,
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hasVariable = variable;
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if (!hasVariable) {
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variable = 'obj';
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source = 'with (' + variable + ') {\n' + source + '\n}\n';
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}
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// cleanup code by stripping empty strings
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source = (isEvaluating ? source.replace(reEmptyStringLeading, '') : source)
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.replace(reEmptyStringMiddle, '$1')
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.replace(reEmptyStringTrailing, '$1;');
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// frame code as the function body
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source = 'function(' + variable + ') {\n' +
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(hasVariable ? '' : variable + ' || (' + variable + ' = {});\n') +
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"var __t, __p = '', __e = _.escape" +
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(isEvaluating
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? ', __j = Array.prototype.join;\n' +
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"function print() { __p += __j.call(arguments, '') }\n"
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: ';\n'
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) +
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source +
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'return __p\n}';
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try {
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var result = Function(importsKeys, 'return ' + source ).apply(undefined, importsValues);
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} catch(e) {
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e.source = source;
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throw e;
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}
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if (data) {
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return result(data);
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}
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// provide the compiled function's source by its `toString` method, in
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// supported environments, or the `source` property as a convenience for
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// inlining compiled templates during the build process
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result.source = source;
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return result;
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}
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module.exports = template;
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