Cleanup _.template docs and generate less unused code in compiled templates.

Former-commit-id: e6703414b83e9286d9ce5e14214375bbbaf9285f
2026-01-31 07:17:50 +00:00 · 2012-08-19 02:13:43 -07:00
parent 985f4aafca
commit e4e41e5ef8
4 changed files with 66 additions and 56 deletions
--- a/build/pre-compile.js
+++ b/build/pre-compile.js
@@ -264,11 +264,8 @@
    // http://code.google.com/closure/compiler/docs/api-tutorial3.html#export
    source = source.replace(RegExp('\\.(' + propWhitelist.join('|') + ')\\b', 'g'), "['$1']");

-    // remove brackets from `_.escape()` in `tokenizeEscape`
-    source = source.replace(/_\['escape']\("/, '_.escape("');
-
    // remove brackets from `_.escape()` in `_.template`
-    source = source.replace(/__e *= *_\['escape']/, '__e=_.escape');
+    source = source.replace(/__e *= *_\['escape']/g, '__e=_.escape');

    // remove brackets from `collection.indexOf` in `_.contains`
    source = source.replace("collection['indexOf'](target)", 'collection.indexOf(target)');
--- a/doc/README.md
+++ b/doc/README.md
@@ -152,7 +152,7 @@ The `lodash` function.
 <!-- div -->

 ### <a id="_version"></a>`_.VERSION`
-<a href="#_version">#</a> [&#x24C8;](https://github.com/bestiejs/lodash/blob/master/lodash.js#L4053 "View in source") [&#x24C9;][1]
+<a href="#_version">#</a> [&#x24C8;](https://github.com/bestiejs/lodash/blob/master/lodash.js#L4060 "View in source") [&#x24C9;][1]

 *(String)*: The semantic version number.

@@ -274,7 +274,7 @@ jQuery('#lodash_button').on('click', buttonView.onClick);
 <!-- div -->

 ### <a id="_chainvalue"></a>`_.chain(value)`
-<a href="#_chainvalue">#</a> [&#x24C8;](https://github.com/bestiejs/lodash/blob/master/lodash.js#L3978 "View in source") [&#x24C9;][1]
+<a href="#_chainvalue">#</a> [&#x24C8;](https://github.com/bestiejs/lodash/blob/master/lodash.js#L3985 "View in source") [&#x24C9;][1]

 Wraps the value in a `lodash` wrapper object.

@@ -2256,7 +2256,7 @@ _.sortedIndex(['twenty', 'thirty', 'fourty'], 'thirty-five', function(word) {
 <!-- div -->

 ### <a id="_tapvalue-interceptor"></a>`_.tap(value, interceptor)`
-<a href="#_tapvalue-interceptor">#</a> [&#x24C8;](https://github.com/bestiejs/lodash/blob/master/lodash.js#L4005 "View in source") [&#x24C9;][1]
+<a href="#_tapvalue-interceptor">#</a> [&#x24C8;](https://github.com/bestiejs/lodash/blob/master/lodash.js#L4012 "View in source") [&#x24C9;][1]

 Invokes `interceptor` with the `value` as the first argument, and then returns `value`. The purpose of this method is to "tap into" a method chain, in order to perform operations on intermediate results within the chain.

@@ -2286,7 +2286,7 @@ _.chain([1,2,3,200])
 <!-- div -->

 ### <a id="_templatetext-data-options"></a>`_.template(text, data, options)`
-<a href="#_templatetext-data-options">#</a> [&#x24C8;](https://github.com/bestiejs/lodash/blob/master/lodash.js#L3781 "View in source") [&#x24C9;][1]
+<a href="#_templatetext-data-options">#</a> [&#x24C8;](https://github.com/bestiejs/lodash/blob/master/lodash.js#L3787 "View in source") [&#x24C9;][1]

 A micro-templating method that handles arbitrary delimiters, preserves whitespace, and correctly escapes quotes within interpolated code.  Note: For Chrome extensions use the `lodash csp` build and see http://code.google.com/chrome/extensions/trunk/sandboxingEval.html

@@ -2300,7 +2300,7 @@ A micro-templating method that handles arbitrary delimiters, preserves whitespac

 #### Example
 ```js
-// using compiled template
+// using a compiled template
 var compiled = _.template('hello: <%= name %>');
 compiled({ 'name': 'moe' });
 // => 'hello: moe'
@@ -2309,32 +2309,38 @@ var list = '<% _.forEach(people, function(name) { %> <li><%= name %></li> <% });
 _.template(list, { 'people': ['moe', 'larry', 'curly'] });
 // => '<li>moe</li><li>larry</li><li>curly</li>'

-var template = _.template('<b><%- value %></b>');
-template({ 'value': '<script>' });
+// using the "escape" delimiter to escape HTML in data property values
+_.template('<b><%- value %></b>', { 'value': '<script>' });
 // => '<b>&lt;script></b>'

-// using `print`
-var compiled = _.template('<% print("Hello " + epithet); %>');
-compiled({ 'epithet': 'stooge' });
+// using the internal `print` function in "evaluate" delimiters
+_.template('<% print("Hello " + epithet); %>', { 'epithet': 'stooge' });
 // => 'Hello stooge.'

-// using custom template settings
+// using custom template delimiter settings
 _.templateSettings = {
  'interpolate': /\{\{(.+?)\}\}/g
 };

-var template = _.template('Hello {{ name }}!');
-template({ 'name': 'Mustache' });
+_.template('Hello {{ name }}!', { 'name': 'Mustache' });
 // => 'Hello Mustache!'

-// specify the `variable` option to avoid using a with-statement during compilation
-_.template('Using a with-statement: <%= data.answer %>', { 'answer': 'no' }, { 'variable': 'data' });
-// => 'Using a with-statement: no'
+// using the `variable` option to ensure a with-statement isn't used in a compiled template
+var compiled = _.template('hello: <%= data.name %>', null, { 'variable': 'data' });
+compiled.source;
+// => function(data) {
+  var __t, __p = '', __e = _.escape;
+  __p += 'hello: ' + ((__t = ( data.name )) == null ? '' : __t);
+  return __p;
+}

-// using the `source` property
-<script>
-  JST.project = <%= _.template(jstText).source %>;
-</script>
+// using the `source` property to inline compiled templates for meaningful
+// line numbers in error messages and a stack trace
+fs.writeFileSync(path.join(cwd, 'jst.js'), '\
+  var JST = {\
+    "main": ' + _.template(mainText).source + '\
+  };\
+');
 ```

 * * *
@@ -2370,7 +2376,7 @@ jQuery(window).on('scroll', throttled);
 <!-- div -->

 ### <a id="_timesn-callback--thisarg"></a>`_.times(n, callback [, thisArg])`
-<a href="#_timesn-callback--thisarg">#</a> [&#x24C8;](https://github.com/bestiejs/lodash/blob/master/lodash.js#L3921 "View in source") [&#x24C9;][1]
+<a href="#_timesn-callback--thisarg">#</a> [&#x24C8;](https://github.com/bestiejs/lodash/blob/master/lodash.js#L3928 "View in source") [&#x24C9;][1]

 Executes the `callback` function `n` times. The `callback` is bound to `thisArg` and invoked with `1` argument; *(index)*.

@@ -2480,7 +2486,7 @@ _.uniq([1, 2, 1.5, 3, 2.5], function(num) { return this.floor(num); }, Math);
 <!-- div -->

 ### <a id="_uniqueidprefix"></a>`_.uniqueId([prefix])`
-<a href="#_uniqueidprefix">#</a> [&#x24C8;](https://github.com/bestiejs/lodash/blob/master/lodash.js#L3948 "View in source") [&#x24C9;][1]
+<a href="#_uniqueidprefix">#</a> [&#x24C8;](https://github.com/bestiejs/lodash/blob/master/lodash.js#L3955 "View in source") [&#x24C9;][1]

 Generates a unique id. If `prefix` is passed, the id will be appended to it.

@@ -2669,7 +2675,7 @@ _.zipObject(['moe', 'larry', 'curly'], [30, 40, 50]);
 <!-- div -->

 ### <a id="_prototypechain"></a>`_.prototype.chain()`
-<a href="#_prototypechain">#</a> [&#x24C8;](https://github.com/bestiejs/lodash/blob/master/lodash.js#L4023 "View in source") [&#x24C9;][1]
+<a href="#_prototypechain">#</a> [&#x24C8;](https://github.com/bestiejs/lodash/blob/master/lodash.js#L4030 "View in source") [&#x24C9;][1]

 Enables method chaining on the wrapper object.

@@ -2690,7 +2696,7 @@ _([1, 2, 3]).value();
 <!-- div -->

 ### <a id="_prototypevalue"></a>`_.prototype.value()`
-<a href="#_prototypevalue">#</a> [&#x24C8;](https://github.com/bestiejs/lodash/blob/master/lodash.js#L4040 "View in source") [&#x24C9;][1]
+<a href="#_prototypevalue">#</a> [&#x24C8;](https://github.com/bestiejs/lodash/blob/master/lodash.js#L4047 "View in source") [&#x24C9;][1]

 Extracts the wrapped value.

--- a/lodash.js
+++ b/lodash.js
@@ -311,7 +311,7 @@
     * @memberOf _.templateSettings
     * @type String
     */
-    'variable': 'obj'
+    'variable': ''
  };

  /*--------------------------------------------------------------------------*/
@@ -3742,7 +3742,7 @@
   *  is given, else it returns the interpolated text.
   * @example
   *
-   * // using compiled template
+   * // using a compiled template
   * var compiled = _.template('hello: <%= name %>');
   * compiled({ 'name': 'moe' });
   * // => 'hello: moe'
@@ -3751,32 +3751,38 @@
   * _.template(list, { 'people': ['moe', 'larry', 'curly'] });
   * // => '<li>moe</li><li>larry</li><li>curly</li>'
   *
-   * var template = _.template('<b><%- value %></b>');
-   * template({ 'value': '<script>' });
+   * // using the "escape" delimiter to escape HTML in data property values
+   * _.template('<b><%- value %></b>', { 'value': '<script>' });
   * // => '<b>&lt;script></b>'
   *
-   * // using `print`
-   * var compiled = _.template('<% print("Hello " + epithet); %>');
-   * compiled({ 'epithet': 'stooge' });
+   * // using the internal `print` function in "evaluate" delimiters
+   * _.template('<% print("Hello " + epithet); %>', { 'epithet': 'stooge' });
   * // => 'Hello stooge.'
   *
-   * // using custom template settings
+   * // using custom template delimiter settings
   * _.templateSettings = {
   *   'interpolate': /\{\{(.+?)\}\}/g
   * };
   *
-   * var template = _.template('Hello {{ name }}!');
-   * template({ 'name': 'Mustache' });
+   * _.template('Hello {{ name }}!', { 'name': 'Mustache' });
   * // => 'Hello Mustache!'
   *
-   * // specify the `variable` option to avoid using a with-statement during compilation
-   * _.template('Using a with-statement: <%= data.answer %>', { 'answer': 'no' }, { 'variable': 'data' });
-   * // => 'Using a with-statement: no'
+   * // using the `variable` option to ensure a with-statement isn't used in a compiled template
+   * var compiled = _.template('hello: <%= data.name %>', null, { 'variable': 'data' });
+   * compiled.source;
+   * // => function(data) {
+   *   var __t, __p = '', __e = _.escape;
+   *   __p += 'hello: ' + ((__t = ( data.name )) == null ? '' : __t);
+   *   return __p;
+   * }
   *
-   * // using the `source` property
-   * <script>
-   *   JST.project = <%= _.template(jstText).source %>;
-   * </script>
+   * // using the `source` property to inline compiled templates for meaningful
+   * // line numbers in error messages and a stack trace
+   * fs.writeFileSync(path.join(cwd, 'jst.js'), '\
+   *   var JST = {\
+   *     "main": ' + _.template(mainText).source + '\
+   *   };\
+   * ');
   */
  function template(text, data, options) {
    // based on John Resig's `tmpl` implementation
@@ -3791,7 +3797,8 @@
        evaluateDelimiter = options.evaluate,
        interpolateDelimiter = options.interpolate,
        settings = lodash.templateSettings,
-        variable = options.variable;
+        variable = options.variable || settings.variable,
+        hasVariable = variable;

    // use default settings if no options object is provided
    if (escapeDelimiter == null) {
@@ -3835,11 +3842,11 @@
    // clear stored code snippets
    tokenized.length = 0;

-    // if `options.variable` is not specified and the template contains "evaluate"
+    // if `variable` is not specified and the template contains "evaluate"
    // delimiters, wrap a with-statement around the generated code to add the
    // data object to the top of the scope chain
-    if (!variable) {
-      variable = settings.variable || lastVariable || 'obj';
+    if (!hasVariable) {
+      variable = lastVariable || 'obj';

      if (isEvaluating) {
        text = 'with (' + variable + ') {\n' + text + '\n}\n';
@@ -3865,12 +3872,12 @@

    // frame code as the function body
    text = 'function(' + variable + ') {\n' +
-      variable + ' || (' + variable + ' = {});\n' +
+      (hasVariable ? '' : variable + ' || (' + variable + ' = {});\n') +
      'var __t, __p = \'\', __e = _.escape' +
      (isEvaluating
        ? ', __j = Array.prototype.join;\n' +
          'function print() { __p += __j.call(arguments, \'\') }\n'
-        : ', __d = ' + variable + '.' + variable + ' || ' + variable + ';\n'
+        : (hasVariable ? '' : ', __d = ' + variable + '.' + variable + ' || ' + variable) + ';\n'
      ) +
      text +
      'return __p\n}';
--- a/lodash.min.js
+++ b/lodash.min.js
@@ -19,8 +19,8 @@ s.concat(ft.call(o)):s),this instanceof n?(v.prototype=e.prototype,u=new v,(o=e.
 ,".+?")+"$"),Z=/__token__(\d+)/g,et=/[&<"']/g,tt=/['\n\r\t\u2028\u2029\\]/g,nt="constructor hasOwnProperty isPrototypeOf propertyIsEnumerable toLocaleString toString valueOf".split(" "),rt="__token__",it=[],st=I.concat,ot=R.hasOwnProperty,ut=I.push,at=R.propertyIsEnumerable,ft=I.slice,lt=R.toString,ct=Y.test(ct=ft.bind)&&ct,ht=Y.test(ht=Array.isArray)&&ht,pt=e.isFinite,dt=Y.test(dt=Object.keys)&&dt,vt="[object Arguments]",mt="[object Array]",gt="[object Boolean]",yt="[object Date]",bt="[object Number]"
 ,wt="[object Object]",Et="[object RegExp]",St="[object String]",xt=e.clearTimeout,Tt=e.setTimeout,Nt,Ct,kt=n;(function(){function e(){this.x=1}var t=[];e.prototype={valueOf:1,y:1};for(var n in new e)t.push(n);for(n in arguments)kt=!n;Nt=4>(t+"").length,Ct="x"!=t[0]})(1);var Lt=!b(arguments),At="x"!=ft.call("x")[0],Ot="xx"!="x"[0]+Object("x")[0];try{var Mt=("[object Object]",lt.call(e.document||0)==wt)}catch(_t){}var Dt=ct&&/\n|Opera/.test(ct+lt.call(e.opera)),Pt=dt&&/^.+$|true/.test(dt+!!e.attachEvent
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+,unknown:n},It={"\\":"\\","'":"'","\n":"n","\r":"r","	":"t","\u2028":"u2028","\u2029":"u2029"};s.templateSettings={escape:/<%-([\s\S]+?)%>/g,evaluate:/<%([\s\S]+?)%>/g,interpolate:/<%=([\s\S]+?)%>/g,variable:""};var qt={a:"b,a,w",j:"b",q:"if(!a)a=f;else if(w)a=i(a,w)",i:"if(a(y,g,b)===false)return s"},Rt={j:"{}",q:"var o;if(typeof a!='function'){var ii=a;a=function(y){return y[ii]}}else if(w)a=i(a,w)",i:"o=a(y,g,b);(e.call(s,o)?s[o]++:s[o]=1)"},Ut={j:"true",i:"if(!a(y,g,b))return!s"},zt={r:i,s:i,
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