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* Copyright 2010 Google Inc.
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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// Author: mdsteele@google.com (Matthew D. Steele)
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#ifndef PAGESPEED_KERNEL_HTML_ELIDE_ATTRIBUTES_FILTER_H_
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#define PAGESPEED_KERNEL_HTML_ELIDE_ATTRIBUTES_FILTER_H_
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#include "pagespeed/kernel/html/empty_html_filter.h"
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#include "pagespeed/kernel/html/html_name.h"
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#include "pagespeed/kernel/base/basictypes.h"
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namespace net_instaweb {
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// Remove attributes and attribute values that can be safely elided.
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class ElideAttributesFilter : public EmptyHtmlFilter {
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explicit ElideAttributesFilter(HtmlParse* html_parse);
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virtual ~ElideAttributesFilter();
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virtual void StartElement(HtmlElement* element);
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virtual const char* Name() const { return "ElideAttributes"; }
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const char* attr_value;
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bool requires_version_5; // Default value only exists in (X)HTML 5.
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typedef std::set<HtmlName::Keyword> KeywordSet;
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typedef std::map<HtmlName::Keyword, KeywordSet> KeywordSetMap;
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typedef std::map<HtmlName::Keyword, AttrValue> ValueMap;
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typedef std::map<HtmlName::Keyword, ValueMap> ValueMapMap;
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HtmlParse* html_parse_;
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KeywordSetMap one_value_attrs_map_; // tag/attrs with only one possible value
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ValueMapMap default_value_map_; // tag/attrs with default values
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DISALLOW_COPY_AND_ASSIGN(ElideAttributesFilter);
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} // namespace net_instaweb
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#endif // PAGESPEED_KERNEL_HTML_ELIDE_ATTRIBUTES_FILTER_H_