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251 Zeilen
9.4 KiB
251 Zeilen
9.4 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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/** 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
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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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// 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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