| /* |
| * 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. |
| */ |
| |
| // Authors: jmarantz@google.com (Joshua Marantz) |
| // jefftk@google.com (Jeff Kaufman) |
| #ifndef NET_INSTAWEB_REWRITER_PUBLIC_RESOURCE_TAG_SCANNER_H_ |
| #define NET_INSTAWEB_REWRITER_PUBLIC_RESOURCE_TAG_SCANNER_H_ |
| |
| #include <cstddef> // for NULL |
| #include <vector> |
| |
| #include "pagespeed/kernel/html/html_element.h" |
| #include "pagespeed/kernel/http/semantic_type.h" |
| |
| namespace net_instaweb { |
| |
| class RewriteOptions; |
| |
| namespace resource_tag_scanner { |
| |
| struct UrlCategoryPair { |
| HtmlElement::Attribute* url; |
| semantic_type::Category category; |
| |
| UrlCategoryPair() |
| : url(NULL), |
| category(semantic_type::kUndefined) {} |
| }; |
| |
| typedef std::vector<UrlCategoryPair> UrlCategoryVector; |
| |
| // If the attribute is url-valued, determine it's semantic category. Return |
| // kUndefined otherwise. |
| // |
| // Supported patterns are: |
| // Scripts: |
| // <script src=...> |
| // Stylesheets: |
| // <link rel="stylesheet" href=...> |
| // Images: |
| // <img src=...>, |
| // <link rel="icon" href=...> |
| // <link rel="apple-touch-icon" href=...> |
| // <link rel="apple-touch-icon-precomposed" href=...> |
| // <link rel="apple-touch-startup-image" href=...> |
| // <body background=...> |
| // <td background=...> |
| // <th background=...> |
| // <table background=...> |
| // <thead background=...> |
| // <tbody background=...> |
| // <tfoot background=...> |
| // <input type="image" src=...> |
| // <command icon=...> |
| // <video poster=...> |
| // Hyperlink: |
| // <a href=...> |
| // <area href=...> |
| // <form action=...> |
| // <blockquote cite=...> |
| // <body cite=...> |
| // <q cite=...> |
| // <ins cite=...> |
| // <del cite=...> |
| // <button formaction=...> |
| // <input formaction=...> |
| // <frame longdesc=...> |
| // <iframe longdesc=...> |
| // <img longdesc=...> |
| // OtherResource: |
| // <audio src=...> |
| // <video src=...> |
| // <source src=...> |
| // <track src=...> |
| // <html manifest=...> |
| // <embed src=...> |
| // <frame src=...> |
| // <iframe src=...> |
| // |
| // Exceptions: |
| // |
| // 1. Because we don't parse the codebase attribute of applet or object elements |
| // it's not safe for us to manipulate any of their other url-valued |
| // attributes. |
| // |
| // 2. The base tag is dealt with elsewhere, but here we skip it. It's not safe |
| // to make any changes to it, so this is safe. It's also not safe to make |
| // changes to <head profile=...> because one use of a profile is as a |
| // globally unique name which a browser or other agent recognizes and |
| // interprets without accessing, so we skip it too. |
| // |
| // 3. While usemap, an attribute of img, input, and object, is technically a |
| // url, it always has the form #name or #id, which means there's nothing we |
| // can do to improve it and there's no harm in leaving it out. |
| // |
| // These exceptions aside, we should support all url-valued attributes in |
| // html4 and html5: |
| // http://dev.w3.org/html5/spec/section-index.html#attributes-1 |
| // http://www.w3.org/TR/REC-html40/index/attributes.html |
| // |
| semantic_type::Category CategorizeAttribute( |
| const HtmlElement* element, |
| const HtmlElement::Attribute* attribute, |
| const RewriteOptions* options); |
| |
| // Examines an HTML element to determine if it's a link to any sort of resource, |
| // extracting out the HREF, SRC, or other URL attributes and identifying their |
| // categories. Because, for example, a LINK tag can be an image, stylesheet, or |
| // nearly anything else, it's not sufficient for callers to assume they can |
| // figure out the category from the element's name. |
| // |
| // See CategorizeAttribute for the meaning of "url-valued attribute". |
| // |
| // Attributes that we can't decode, such as non-ascii urls, will be skipped. |
| // |
| // Attributes are returned in left-to-right order. |
| void ScanElement(HtmlElement* element, const RewriteOptions* options, |
| UrlCategoryVector* attributes); |
| |
| } // namespace resource_tag_scanner |
| } // namespace net_instaweb |
| |
| #endif // NET_INSTAWEB_REWRITER_PUBLIC_RESOURCE_TAG_SCANNER_H_ |
