author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Fri, 11 Jun 2010 14:42:15 +0300 | |
changeset 74 | 91031d3aab7d |
parent 66 | cacf6ee57968 |
permissions | -rw-r--r-- |
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/* |
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* CSS Media Query Evaluator |
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* |
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* Copyright (C) 2006 Kimmo Kinnunen <kimmo.t.kinnunen@nokia.com>. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY |
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR |
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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#include "config.h" |
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#include "MediaQueryEvaluator.h" |
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#include "Chrome.h" |
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#include "CSSPrimitiveValue.h" |
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#include "CSSValueList.h" |
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#include "DeprecatedString.h" |
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#include "FloatRect.h" |
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#include "Frame.h" |
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#include "FrameView.h" |
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#include "IntRect.h" |
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#include "MediaFeatureNames.h" |
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#include "MediaList.h" |
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#include "MediaQuery.h" |
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#include "MediaQueryExp.h" |
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#include "Page.h" |
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#include "RenderStyle.h" |
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#include "PlatformScreen.h" |
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#include <wtf/HashMap.h> |
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namespace WebCore { |
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using namespace MediaFeatureNames; |
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enum MediaFeaturePrefix { MinPrefix, MaxPrefix, NoPrefix }; |
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typedef bool (*EvalFunc)(CSSValue*, RenderStyle*, Page*, MediaFeaturePrefix); |
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typedef HashMap<AtomicStringImpl*, EvalFunc> FunctionMap; |
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static FunctionMap* gFunctionMap; |
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/* |
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* FIXME: following media features are not implemented: color_index, scan, resolution |
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* |
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* color_index, min-color-index, max_color_index: It's unknown how to retrieve |
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* the information if the display mode is indexed |
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* scan: The "scan" media feature describes the scanning process of |
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* tv output devices. It's unknown how to retrieve this information from |
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* the platform |
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* resolution, min-resolution, max-resolution: css parser doesn't seem to |
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* support CSS_DIMENSION |
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*/ |
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MediaQueryEvaluator::MediaQueryEvaluator(bool mediaFeatureResult) |
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: m_page(0) |
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, m_style(0) |
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, m_expResult(mediaFeatureResult) |
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{ |
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} |
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MediaQueryEvaluator:: MediaQueryEvaluator(const String& acceptedMediaType, bool mediaFeatureResult) |
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: m_mediaType(acceptedMediaType) |
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, m_page(0) |
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, m_style(0) |
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, m_expResult(mediaFeatureResult) |
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{ |
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} |
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MediaQueryEvaluator:: MediaQueryEvaluator(const char* acceptedMediaType, bool mediaFeatureResult) |
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: m_mediaType(acceptedMediaType) |
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, m_page(0) |
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, m_style(0) |
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, m_expResult(mediaFeatureResult) |
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{ |
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} |
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MediaQueryEvaluator:: MediaQueryEvaluator(const String& acceptedMediaType, Page* page, RenderStyle* style) |
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: m_mediaType(acceptedMediaType.lower()) |
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, m_page(page) |
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, m_style(style) |
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, m_expResult(false) // doesn't matter when we have m_page and m_style |
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{ |
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} |
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MediaQueryEvaluator::~MediaQueryEvaluator() |
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{ |
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} |
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|
105 |
bool MediaQueryEvaluator::mediaTypeMatch(const String& mediaTypeToMatch) const |
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106 |
{ |
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107 |
return mediaTypeToMatch.isEmpty() |
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108 |
|| equalIgnoringCase(mediaTypeToMatch, "all") |
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109 |
|| equalIgnoringCase(mediaTypeToMatch, m_mediaType); |
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110 |
} |
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|
111 |
|
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112 |
bool MediaQueryEvaluator::mediaTypeMatchSpecific(const char* mediaTypeToMatch) const |
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113 |
{ |
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114 |
// Like mediaTypeMatch, but without the special cases for "" and "all". |
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115 |
ASSERT(mediaTypeToMatch); |
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116 |
ASSERT(mediaTypeToMatch[0] != '\0'); |
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ASSERT(!equalIgnoringCase(mediaTypeToMatch, String("all"))); |
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return equalIgnoringCase(mediaTypeToMatch, m_mediaType); |
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119 |
} |
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120 |
|
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121 |
static bool applyRestrictor(MediaQuery::Restrictor r, bool value) |
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122 |
{ |
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123 |
return r == MediaQuery::Not ? !value : value; |
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124 |
} |
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125 |
|
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126 |
bool MediaQueryEvaluator::eval(const MediaList* mediaList) const |
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127 |
{ |
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128 |
if (!mediaList) |
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129 |
return true; |
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130 |
|
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const Vector<MediaQuery*>* queries = mediaList->mediaQueries(); |
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132 |
if (!queries->size()) |
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133 |
return true; // empty query list evaluates to true |
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134 |
|
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135 |
// iterate over queries, stop if any of them eval to true (OR semantics) |
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|
136 |
bool result = false; |
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|
137 |
for (size_t i = 0; i < queries->size() && !result; ++i) { |
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|
138 |
MediaQuery* query = queries->at(i); |
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|
139 |
|
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140 |
if (mediaTypeMatch(query->mediaType())) { |
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|
141 |
const Vector<MediaQueryExp*>* exps = query->expressions(); |
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142 |
// iterate through expressions, stop if any of them eval to false |
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143 |
// (AND semantics) |
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144 |
size_t j = 0; |
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|
145 |
for (; j < exps->size() && eval(exps->at(j)); ++j) /* empty*/; |
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|
146 |
|
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147 |
// assume true if we are at the end of the list, |
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148 |
// otherwise assume false |
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|
149 |
result = applyRestrictor(query->restrictor(), exps->size() == j); |
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150 |
} else |
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|
151 |
result = applyRestrictor(query->restrictor(), false); |
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152 |
} |
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|
153 |
|
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154 |
return result; |
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|
155 |
} |
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|
156 |
|
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157 |
static bool parseAspectRatio(CSSValue* value, int& a, int& b) |
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|
158 |
{ |
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|
159 |
if (value->isValueList()){ |
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|
160 |
CSSValueList* valueList = static_cast<CSSValueList*>(value); |
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|
161 |
if (valueList->length() == 3) { |
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|
162 |
CSSValue* i0 = valueList->item(0); |
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|
163 |
CSSValue* i1 = valueList->item(1); |
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|
164 |
CSSValue* i2 = valueList->item(2); |
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|
165 |
if (i0->isPrimitiveValue() && static_cast<CSSPrimitiveValue*>(i0)->primitiveType() == CSSPrimitiveValue::CSS_NUMBER |
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|
166 |
&& i1->isPrimitiveValue() && static_cast<CSSPrimitiveValue*>(i1)->primitiveType() == CSSPrimitiveValue::CSS_STRING |
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|
167 |
&& i2->isPrimitiveValue() && static_cast<CSSPrimitiveValue*>(i2)->primitiveType() == CSSPrimitiveValue::CSS_NUMBER) { |
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|
168 |
String str = static_cast<CSSPrimitiveValue*>(i1)->getStringValue(); |
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|
169 |
if (!str.isNull() && str.length() == 1 && str[0] == DeprecatedChar('/')) { |
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|
170 |
a = static_cast<CSSPrimitiveValue*>(i0)->getIntValue(CSSPrimitiveValue::CSS_NUMBER); |
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|
171 |
b = static_cast<CSSPrimitiveValue*>(i2)->getIntValue(CSSPrimitiveValue::CSS_NUMBER); |
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|
172 |
return true; |
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|
173 |
} |
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|
174 |
} |
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|
175 |
} |
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|
176 |
} |
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|
177 |
return false; |
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|
178 |
} |
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|
179 |
|
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|
180 |
inline bool cmpvalue(int a, int b, MediaFeaturePrefix op) |
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|
181 |
{ |
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|
182 |
switch (op) { |
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|
183 |
case MinPrefix: |
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|
184 |
return a >= b; |
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|
185 |
case MaxPrefix: |
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|
186 |
return a <= b; |
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|
187 |
case NoPrefix: |
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|
188 |
return a == b; |
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|
189 |
} |
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|
190 |
return false; |
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|
191 |
} |
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|
192 |
|
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|
193 |
inline bool cmpvalue(float a, float b, MediaFeaturePrefix op) |
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|
194 |
{ |
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|
195 |
switch (op) { |
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|
196 |
case MinPrefix: |
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|
197 |
return a >= b; |
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|
198 |
case MaxPrefix: |
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|
199 |
return a <= b; |
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|
200 |
case NoPrefix: |
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|
201 |
return a == b; |
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|
202 |
} |
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|
203 |
return false; |
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|
204 |
} |
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|
205 |
|
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|
206 |
static bool numberValue(CSSValue* value, float& result) |
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|
207 |
{ |
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|
208 |
if (value->isPrimitiveValue() |
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|
209 |
&& static_cast<CSSPrimitiveValue*>(value)->primitiveType() == CSSPrimitiveValue::CSS_NUMBER) { |
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|
210 |
result = static_cast<CSSPrimitiveValue*>(value)->getFloatValue(CSSPrimitiveValue::CSS_NUMBER); |
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|
211 |
return true; |
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|
212 |
} |
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parents:
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return false; |
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} |
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|
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static bool colorMediaFeatureEval(CSSValue* value, RenderStyle* style, Page* page, MediaFeaturePrefix op) |
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{ |
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int bitsPerComponent = screenDepthPerComponent(page->mainFrame()->view()); |
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float number; |
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if (value) |
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return numberValue(value, number) && cmpvalue(bitsPerComponent, (int)number, op); |
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|
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return bitsPerComponent != 0; |
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} |
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|
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static bool monochromeMediaFeatureEval(CSSValue* value, RenderStyle* style, Page* page, MediaFeaturePrefix op) |
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{ |
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if (!screenIsMonochrome(page->mainFrame()->view())) |
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return false; |
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|
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return colorMediaFeatureEval(value, style, page, op); |
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} |
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|
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static bool device_aspect_ratioMediaFeatureEval(CSSValue* value, RenderStyle* style, Page* page, MediaFeaturePrefix op) |
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{ |
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if (value) { |
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FloatRect sg = screenRect(page->mainFrame()->view()); |
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int a = 0; |
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int b = 0; |
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if (parseAspectRatio(value, a, b)) |
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return b != 0 && cmpvalue(a * (int)sg.height(), b * (int)sg.width(), op); |
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return false; |
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} |
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|
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// ({,min-,max-}device-aspect-ratio) |
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// assume if we have a device, its aspect ratio is non-zero |
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return true; |
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} |
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|
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static bool device_pixel_ratioMediaFeatureEval(CSSValue *value, RenderStyle* style, Page* page, MediaFeaturePrefix op) |
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{ |
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if (value) |
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return value->isPrimitiveValue() && cmpvalue(page->chrome()->scaleFactor(), static_cast<CSSPrimitiveValue*>(value)->getFloatValue(), op); |
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|
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return page->chrome()->scaleFactor() != 0; |
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} |
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|
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|
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static bool gridMediaFeatureEval(CSSValue* value, RenderStyle* style, Page* page, MediaFeaturePrefix op) |
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{ |
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// if output device is bitmap, grid: 0 == true |
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// assume we have bitmap device |
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float number; |
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if (value && numberValue(value, number)) |
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return cmpvalue((int)number, 0, op); |
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|
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return false; |
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|
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} |
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|
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|
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static bool device_heightMediaFeatureEval(CSSValue* value, RenderStyle* style, Page* page, MediaFeaturePrefix op) |
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|
269 |
{ |
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if (value) { |
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|
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FloatRect sg = screenRect(page->mainFrame()->view()); |
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return value->isPrimitiveValue() && cmpvalue((int)sg.height(), static_cast<CSSPrimitiveValue*>(value)->computeLengthInt(style), op); |
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|
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} |
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// ({,min-,max-}device-height) |
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// assume if we have a device, assume non-zero |
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return true; |
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|
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} |
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|
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|
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|
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static bool device_widthMediaFeatureEval(CSSValue* value, RenderStyle* style, Page* page, MediaFeaturePrefix op) |
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|
280 |
{ |
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|
281 |
if (value) { |
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|
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FloatRect sg = screenRect(page->mainFrame()->view()); |
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|
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return value->isPrimitiveValue() && cmpvalue((int)sg.width(), static_cast<CSSPrimitiveValue*>(value)->computeLengthInt(style), op); |
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|
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} |
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|
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// ({,min-,max-}device-width) |
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|
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// assume if we have a device, assume non-zero |
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|
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return true; |
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|
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} |
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|
289 |
|
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|
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static bool heightMediaFeatureEval(CSSValue* value, RenderStyle* style, Page* page, MediaFeaturePrefix op) |
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|
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{ |
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|
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FrameView* view = page->mainFrame()->view(); |
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|
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|
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|
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if (value) |
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return value->isPrimitiveValue() && cmpvalue(view->visibleHeight(), static_cast<CSSPrimitiveValue*>(value)->computeLengthInt(style), op); |
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|
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|
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|
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return view->visibleHeight() != 0; |
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|
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} |
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|
299 |
|
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|
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static bool widthMediaFeatureEval(CSSValue* value, RenderStyle* style, Page* page, MediaFeaturePrefix op) |
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|
301 |
{ |
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|
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FrameView* view = page->mainFrame()->view(); |
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|
303 |
|
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|
304 |
if (value) |
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|
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return value->isPrimitiveValue() && cmpvalue(view->visibleWidth(), static_cast<CSSPrimitiveValue*>(value)->computeLengthInt(style), op); |
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|
306 |
|
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|
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return view->visibleWidth() != 0; |
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|
308 |
} |
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|
309 |
|
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|
310 |
// rest of the functions are trampolines which set the prefix according to the media feature expression used |
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|
311 |
|
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|
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static bool min_colorMediaFeatureEval(CSSValue* value, RenderStyle* style, Page* page, MediaFeaturePrefix /*op*/) |
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|
313 |
{ |
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|
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return colorMediaFeatureEval(value, style, page, MinPrefix); |
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|
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} |
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|
316 |
|
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|
317 |
static bool max_colorMediaFeatureEval(CSSValue* value, RenderStyle* style, Page* page, MediaFeaturePrefix /*op*/) |
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|
318 |
{ |
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|
319 |
return colorMediaFeatureEval(value, style, page, MaxPrefix); |
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|
320 |
} |
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static bool min_monochromeMediaFeatureEval(CSSValue* value, RenderStyle* style, Page* page, MediaFeaturePrefix /*op*/) |
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{ |
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return monochromeMediaFeatureEval(value, style, page, MinPrefix); |
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} |
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static bool max_monochromeMediaFeatureEval(CSSValue* value, RenderStyle* style, Page* page, MediaFeaturePrefix /*op*/) |
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{ |
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return monochromeMediaFeatureEval(value, style, page, MaxPrefix); |
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} |
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static bool min_device_aspect_ratioMediaFeatureEval(CSSValue* value, RenderStyle* style, Page* page, MediaFeaturePrefix /*op*/) |
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{ |
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return device_aspect_ratioMediaFeatureEval(value, style, page, MinPrefix); |
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} |
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static bool max_device_aspect_ratioMediaFeatureEval(CSSValue* value, RenderStyle* style, Page* page, MediaFeaturePrefix /*op*/) |
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{ |
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return device_aspect_ratioMediaFeatureEval(value, style, page, MaxPrefix); |
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} |
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static bool min_device_pixel_ratioMediaFeatureEval(CSSValue* value, RenderStyle* style, Page* page, MediaFeaturePrefix /*op*/) |
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{ |
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return device_pixel_ratioMediaFeatureEval(value, style, page, MinPrefix); |
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} |
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static bool max_device_pixel_ratioMediaFeatureEval(CSSValue* value, RenderStyle* style, Page* page, MediaFeaturePrefix /*op*/) |
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{ |
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return device_pixel_ratioMediaFeatureEval(value, style, page, MaxPrefix); |
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} |
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static bool min_heightMediaFeatureEval(CSSValue* value, RenderStyle* style, Page* page, MediaFeaturePrefix /*op*/) |
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{ |
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return heightMediaFeatureEval(value, style, page, MinPrefix); |
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} |
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static bool max_heightMediaFeatureEval(CSSValue* value, RenderStyle* style, Page* page, MediaFeaturePrefix /*op*/) |
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{ |
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return heightMediaFeatureEval(value, style, page, MaxPrefix); |
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} |
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static bool min_widthMediaFeatureEval(CSSValue* value, RenderStyle* style, Page* page, MediaFeaturePrefix /*op*/) |
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{ |
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return widthMediaFeatureEval(value, style, page, MinPrefix); |
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static bool max_widthMediaFeatureEval(CSSValue* value, RenderStyle* style, Page* page, MediaFeaturePrefix /*op*/) |
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{ |
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return widthMediaFeatureEval(value, style, page, MaxPrefix); |
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} |
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static bool min_device_heightMediaFeatureEval(CSSValue* value, RenderStyle* style, Page* page, MediaFeaturePrefix /*op*/) |
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{ |
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return device_heightMediaFeatureEval(value, style, page, MinPrefix); |
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} |
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static bool max_device_heightMediaFeatureEval(CSSValue* value, RenderStyle* style, Page* page, MediaFeaturePrefix /*op*/) |
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{ |
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return device_heightMediaFeatureEval(value, style, page, MaxPrefix); |
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} |
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static bool min_device_widthMediaFeatureEval(CSSValue* value, RenderStyle* style, Page* page, MediaFeaturePrefix /*op*/) |
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{ |
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return device_widthMediaFeatureEval(value, style, page, MinPrefix); |
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} |
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static bool max_device_widthMediaFeatureEval(CSSValue* value, RenderStyle* style, Page* page, MediaFeaturePrefix /*op*/) |
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{ |
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return device_widthMediaFeatureEval(value, style, page, MaxPrefix); |
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} |
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static void createFunctionMap() |
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{ |
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// Create the table. |
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gFunctionMap = new FunctionMap; |
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#define ADD_TO_FUNCTIONMAP(name, str) \ |
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gFunctionMap->set(name##MediaFeature.impl(), name##MediaFeatureEval); |
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CSS_MEDIAQUERY_NAMES_FOR_EACH_MEDIAFEATURE(ADD_TO_FUNCTIONMAP); |
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#undef ADD_TO_FUNCTIONMAP |
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} |
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bool MediaQueryEvaluator::eval(const MediaQueryExp* expr) const |
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{ |
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if (!m_page || !m_style) |
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return m_expResult; |
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if (!gFunctionMap) |
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createFunctionMap(); |
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// call the media feature evaluation function. Assume no prefix |
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// and let trampoline functions override the prefix if prefix is |
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// used |
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EvalFunc func = gFunctionMap->get(expr->mediaFeature().impl()); |
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if (func) |
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return func(expr->value(), m_style, m_page, NoPrefix); |
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|
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return false; |
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} |
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} // namespace |