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							273 lines
						
					
					
						
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							273 lines
						
					
					
						
							10 KiB
						
					
					
				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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/** Error message constants. */
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var INVALID_TEMPL_VAR_ERROR_TEXT = 'Invalid `variable` option passed into `_.template`';
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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 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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 * 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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/** 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\u2028\u2029\\]/g;
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/** Used for built-in method references. */
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var objectProto = Object.prototype;
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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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 * 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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  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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  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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  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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  // 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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  // 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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  string.replace(reDelimiters, function(match, escapeValue, interpolateValue, esTemplateValue, evaluateValue, offset) {
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    interpolateValue || (interpolateValue = esTemplateValue);
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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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    // 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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    // 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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  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 = 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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  // 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 || '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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  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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  // 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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module.exports = template;
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