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							272 lines
						
					
					
						
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				var assignInWith = require('./assignInWith'), | 
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    attempt = require('./attempt'), | 
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    baseValues = require('./_baseValues'), | 
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    customDefaultsAssignIn = require('./_customDefaultsAssignIn'), | 
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    escapeStringChar = require('./_escapeStringChar'), | 
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    isError = require('./isError'), | 
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    isIterateeCall = require('./_isIterateeCall'), | 
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    keys = require('./keys'), | 
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    reInterpolate = require('./_reInterpolate'), | 
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    templateSettings = require('./templateSettings'), | 
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    toString = require('./toString'); | 
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 | 
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/** Error message constants. */ | 
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var INVALID_TEMPL_VAR_ERROR_TEXT = 'Invalid `variable` option passed into `_.template`'; | 
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 | 
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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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/** | 
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 * Used to validate the `validate` option in `_.template` variable. | 
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 * | 
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 * Forbids characters which could potentially change the meaning of the function argument definition: | 
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 * - "()," (modification of function parameters) | 
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 * - "=" (default value) | 
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 * - "[]{}" (destructuring of function parameters) | 
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 * - "/" (beginning of a comment) | 
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 * - whitespace | 
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 */ | 
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var reForbiddenIdentifierChars = /[()=,{}\[\]\/\s]/; | 
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 | 
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/** | 
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 * Used to match | 
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 * [ES template delimiters](http://ecma-international.org/ecma-262/7.0/#sec-template-literal-lexical-components). | 
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 */ | 
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var reEsTemplate = /\$\{([^\\}]*(?:\\.[^\\}]*)*)\}/g; | 
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 | 
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/** Used to ensure capturing order of template delimiters. */ | 
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var reNoMatch = /($^)/; | 
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 | 
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/** Used to match unescaped characters in compiled string literals. */ | 
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var reUnescapedString = /['\n\r\u2028\u2029\\]/g; | 
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 | 
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/** Used for built-in method references. */ | 
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var objectProto = Object.prototype; | 
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 | 
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/** Used to check objects for own properties. */ | 
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var hasOwnProperty = objectProto.hasOwnProperty; | 
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 | 
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/** | 
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 * Creates a compiled template function that can interpolate data properties | 
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 * in "interpolate" delimiters, HTML-escape interpolated data properties in | 
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 * "escape" delimiters, and execute JavaScript in "evaluate" delimiters. Data | 
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 * properties may be accessed as free variables in the template. If a setting | 
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 * object is given, it takes precedence over `_.templateSettings` values. | 
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 * | 
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 * **Note:** In the development build `_.template` utilizes | 
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 * [sourceURLs](http://www.html5rocks.com/en/tutorials/developertools/sourcemaps/#toc-sourceurl) | 
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 * for easier debugging. | 
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 * | 
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 * For more information on precompiling templates see | 
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 * [lodash's custom builds documentation](https://lodash.com/custom-builds). | 
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 * | 
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 * For more information on Chrome extension sandboxes see | 
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 * [Chrome's extensions documentation](https://developer.chrome.com/extensions/sandboxingEval). | 
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 * | 
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 * @static | 
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 * @since 0.1.0 | 
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 * @memberOf _ | 
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 * @category String | 
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 * @param {string} [string=''] The template string. | 
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 * @param {Object} [options={}] The options object. | 
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 * @param {RegExp} [options.escape=_.templateSettings.escape] | 
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 *  The HTML "escape" delimiter. | 
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 * @param {RegExp} [options.evaluate=_.templateSettings.evaluate] | 
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 *  The "evaluate" delimiter. | 
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 * @param {Object} [options.imports=_.templateSettings.imports] | 
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 *  An object to import into the template as free variables. | 
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 * @param {RegExp} [options.interpolate=_.templateSettings.interpolate] | 
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 *  The "interpolate" delimiter. | 
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 * @param {string} [options.sourceURL='templateSources[n]'] | 
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 *  The sourceURL of the compiled template. | 
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 * @param {string} [options.variable='obj'] | 
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 *  The data object variable name. | 
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 * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`. | 
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 * @returns {Function} Returns the compiled template function. | 
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 * @example | 
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 * | 
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 * // Use the "interpolate" delimiter to create a compiled template. | 
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 * var compiled = _.template('hello <%= user %>!'); | 
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 * compiled({ 'user': 'fred' }); | 
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 * // => 'hello fred!' | 
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 * | 
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 * // Use the HTML "escape" delimiter to escape data property values. | 
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 * var compiled = _.template('<b><%- value %></b>'); | 
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 * compiled({ 'value': '<script>' }); | 
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 * // => '<b><script></b>' | 
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 * | 
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 * // Use the "evaluate" delimiter to execute JavaScript and generate HTML. | 
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 * var compiled = _.template('<% _.forEach(users, function(user) { %><li><%- user %></li><% }); %>'); | 
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 * compiled({ 'users': ['fred', 'barney'] }); | 
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 * // => '<li>fred</li><li>barney</li>' | 
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 * | 
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 * // Use the internal `print` function in "evaluate" delimiters. | 
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 * var compiled = _.template('<% print("hello " + user); %>!'); | 
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 * compiled({ 'user': 'barney' }); | 
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 * // => 'hello barney!' | 
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 * | 
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 * // Use the ES template literal delimiter as an "interpolate" delimiter. | 
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 * // Disable support by replacing the "interpolate" delimiter. | 
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 * var compiled = _.template('hello ${ user }!'); | 
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 * compiled({ 'user': 'pebbles' }); | 
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 * // => 'hello pebbles!' | 
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 * | 
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 * // Use backslashes to treat delimiters as plain text. | 
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 * var compiled = _.template('<%= "\\<%- value %\\>" %>'); | 
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 * compiled({ 'value': 'ignored' }); | 
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 * // => '<%- value %>' | 
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 * | 
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 * // Use the `imports` option to import `jQuery` as `jq`. | 
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 * var text = '<% jq.each(users, function(user) { %><li><%- user %></li><% }); %>'; | 
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 * var compiled = _.template(text, { 'imports': { 'jq': jQuery } }); | 
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 * compiled({ 'users': ['fred', 'barney'] }); | 
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 * // => '<li>fred</li><li>barney</li>' | 
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 * | 
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 * // Use the `sourceURL` option to specify a custom sourceURL for the template. | 
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 * var compiled = _.template('hello <%= user %>!', { '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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 * // Use the `variable` option to ensure a with-statement isn't used in the compiled template. | 
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 * var compiled = _.template('hi <%= data.user %>!', { 'variable': 'data' }); | 
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 * compiled.source; | 
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 * // => function(data) { | 
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 * //   var __t, __p = ''; | 
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 * //   __p += 'hi ' + ((__t = ( data.user )) == null ? '' : __t) + '!'; | 
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 * //   return __p; | 
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 * // } | 
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 * | 
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 * // Use custom template delimiters. | 
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 * _.templateSettings.interpolate = /{{([\s\S]+?)}}/g; | 
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 * var compiled = _.template('hello {{ user }}!'); | 
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 * compiled({ 'user': 'mustache' }); | 
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 * // => 'hello mustache!' | 
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 * | 
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 * // Use the `source` property to inline compiled templates for meaningful | 
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 * // line numbers in error messages and stack traces. | 
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 * fs.writeFileSync(path.join(process.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(string, options, guard) { | 
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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 (https://github.com/olado/doT). | 
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  var settings = templateSettings.imports._.templateSettings || templateSettings; | 
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 | 
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  if (guard && isIterateeCall(string, options, guard)) { | 
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    options = undefined; | 
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  } | 
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  string = toString(string); | 
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  options = assignInWith({}, options, settings, customDefaultsAssignIn); | 
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 | 
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  var imports = assignInWith({}, options.imports, settings.imports, customDefaultsAssignIn), | 
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      importsKeys = keys(imports), | 
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      importsValues = baseValues(imports, importsKeys); | 
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 | 
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  var isEscaping, | 
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      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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 | 
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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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 | 
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  // Use a sourceURL for easier debugging. | 
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  // The sourceURL gets injected into the source that's eval-ed, so be careful | 
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  // to normalize all kinds of whitespace, so e.g. newlines (and unicode versions of it) can't sneak in | 
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  // and escape the comment, thus injecting code that gets evaled. | 
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  var sourceURL = hasOwnProperty.call(options, 'sourceURL') | 
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    ? ('//# sourceURL=' + | 
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       (options.sourceURL + '').replace(/\s/g, ' ') + | 
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       '\n') | 
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    : ''; | 
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 | 
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  string.replace(reDelimiters, function(match, escapeValue, interpolateValue, esTemplateValue, evaluateValue, offset) { | 
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    interpolateValue || (interpolateValue = esTemplateValue); | 
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 | 
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    // Escape characters that can't be included in string literals. | 
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    source += string.slice(index, offset).replace(reUnescapedString, escapeStringChar); | 
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 | 
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    // Replace delimiters with snippets. | 
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    if (escapeValue) { | 
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      isEscaping = true; | 
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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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 | 
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    // The JS engine embedded in Adobe products needs `match` returned in | 
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    // order to produce the correct `offset` value. | 
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    return match; | 
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  }); | 
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 | 
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  source += "';\n"; | 
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 | 
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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 = hasOwnProperty.call(options, 'variable') && options.variable; | 
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  if (!variable) { | 
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    source = 'with (obj) {\n' + source + '\n}\n'; | 
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  } | 
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  // Throw an error if a forbidden character was found in `variable`, to prevent | 
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  // potential command injection attacks. | 
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  else if (reForbiddenIdentifierChars.test(variable)) { | 
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    throw new Error(INVALID_TEMPL_VAR_ERROR_TEXT); | 
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  } | 
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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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 | 
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  // Frame code as the function body. | 
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  source = 'function(' + (variable || 'obj') + ') {\n' + | 
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    (variable | 
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      ? '' | 
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      : 'obj || (obj = {});\n' | 
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    ) + | 
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    "var __t, __p = ''" + | 
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    (isEscaping | 
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       ? ', __e = _.escape' | 
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       : '' | 
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    ) + | 
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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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 | 
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  var result = attempt(function() { | 
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    return Function(importsKeys, sourceURL + 'return ' + source) | 
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      .apply(undefined, importsValues); | 
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  }); | 
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 | 
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  // Provide the compiled function's source by its `toString` method or | 
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  // the `source` property as a convenience for inlining compiled templates. | 
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  result.source = source; | 
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  if (isError(result)) { | 
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    throw result; | 
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  } | 
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  return result; | 
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} | 
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 | 
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module.exports = template;
 | 
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 |