| /* |
| * Copyright 2010 Google Inc. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| // Author: jmarantz@google.com (Joshua Marantz) |
| |
| #ifndef NET_INSTAWEB_REWRITER_PUBLIC_SCRIPT_TAG_SCANNER_H_ |
| #define NET_INSTAWEB_REWRITER_PUBLIC_SCRIPT_TAG_SCANNER_H_ |
| |
| #include "pagespeed/kernel/base/basictypes.h" |
| #include "pagespeed/kernel/base/string.h" |
| #include "pagespeed/kernel/base/string_util.h" |
| #include "pagespeed/kernel/html/html_element.h" |
| |
| namespace net_instaweb { |
| class HtmlParse; |
| |
| class ScriptTagScanner { |
| public: |
| enum ScriptClassification { |
| kNonScript, |
| kUnknownScript, |
| kJavaScript |
| }; |
| |
| // Bit flags that specify when the script is to be run |
| enum ExecutionModeFlags { |
| kExecuteSync = 0, |
| kExecuteDefer = 1, |
| kExecuteAsync = 2, |
| kExecuteForEvent = 4 // IE extension. If this is set, |
| // script will not run in browsers following HTML5, |
| // and will run at hard-to-describe time in IE. |
| }; |
| |
| explicit ScriptTagScanner(HtmlParse* html_parse); |
| |
| // Examines an HTML element and determine if it is a script. |
| // If it's not, it returns kNonScript and doesn't touch *src. |
| // If it is a script, it returns whether it is JavaScript or not, |
| // and sets *src to the src attribute (perhaps NULL) |
| ScriptClassification ParseScriptElement(HtmlElement* element, |
| HtmlElement::Attribute** src); |
| |
| // Returns which execution model attributes are set. |
| // Keep in mind, however, that HTML5 browsers will ignore |
| // kExecuteDefer and kExecuteAsync on elements without src='' |
| int ExecutionMode(const HtmlElement* element) const; |
| |
| private: |
| // Normalizes the input str by trimming whitespace and lowercasing. |
| static GoogleString Normalized(const StringPiece& str); |
| |
| bool IsJsMime(const GoogleString& type_str); |
| |
| DISALLOW_COPY_AND_ASSIGN(ScriptTagScanner); |
| }; |
| |
| } // namespace net_instaweb |
| |
| #endif // NET_INSTAWEB_REWRITER_PUBLIC_SCRIPT_TAG_SCANNER_H_ |