MediaQueryEvaluator.cpp [plain text]
#include "config.h"
#include "MediaQueryEvaluator.h"
#include "Chrome.h"
#include "CSSPrimitiveValue.h"
#include "CSSValueList.h"
#include "FloatRect.h"
#include "Frame.h"
#include "FrameView.h"
#include "IntRect.h"
#include "MediaFeatureNames.h"
#include "MediaList.h"
#include "MediaQuery.h"
#include "MediaQueryExp.h"
#include "Page.h"
#include "RenderStyle.h"
#include "PlatformScreen.h"
#include <wtf/HashMap.h>
namespace WebCore {
using namespace MediaFeatureNames;
enum MediaFeaturePrefix { MinPrefix, MaxPrefix, NoPrefix };
typedef bool (*EvalFunc)(CSSValue*, RenderStyle*, Page*, MediaFeaturePrefix);
typedef HashMap<AtomicStringImpl*, EvalFunc> FunctionMap;
static FunctionMap* gFunctionMap;
MediaQueryEvaluator::MediaQueryEvaluator(bool mediaFeatureResult)
: m_page(0)
, m_style(0)
, m_expResult(mediaFeatureResult)
{
}
MediaQueryEvaluator:: MediaQueryEvaluator(const String& acceptedMediaType, bool mediaFeatureResult)
: m_mediaType(acceptedMediaType)
, m_page(0)
, m_style(0)
, m_expResult(mediaFeatureResult)
{
}
MediaQueryEvaluator:: MediaQueryEvaluator(const char* acceptedMediaType, bool mediaFeatureResult)
: m_mediaType(acceptedMediaType)
, m_page(0)
, m_style(0)
, m_expResult(mediaFeatureResult)
{
}
MediaQueryEvaluator:: MediaQueryEvaluator(const String& acceptedMediaType, Page* page, RenderStyle* style)
: m_mediaType(acceptedMediaType.lower())
, m_page(page)
, m_style(style)
, m_expResult(false) {
}
MediaQueryEvaluator::~MediaQueryEvaluator()
{
}
bool MediaQueryEvaluator::mediaTypeMatch(const String& mediaTypeToMatch) const
{
return mediaTypeToMatch.isEmpty()
|| equalIgnoringCase(mediaTypeToMatch, "all")
|| equalIgnoringCase(mediaTypeToMatch, m_mediaType);
}
bool MediaQueryEvaluator::mediaTypeMatchSpecific(const char* mediaTypeToMatch) const
{
ASSERT(mediaTypeToMatch);
ASSERT(mediaTypeToMatch[0] != '\0');
ASSERT(!equalIgnoringCase(mediaTypeToMatch, String("all")));
return equalIgnoringCase(mediaTypeToMatch, m_mediaType);
}
static bool applyRestrictor(MediaQuery::Restrictor r, bool value)
{
return r == MediaQuery::Not ? !value : value;
}
bool MediaQueryEvaluator::eval(const MediaList* mediaList) const
{
if (!mediaList)
return true;
const Vector<MediaQuery*>* queries = mediaList->mediaQueries();
if (!queries->size())
return true;
bool result = false;
for (size_t i = 0; i < queries->size() && !result; ++i) {
MediaQuery* query = queries->at(i);
if (mediaTypeMatch(query->mediaType())) {
const Vector<MediaQueryExp*>* exps = query->expressions();
size_t j = 0;
for (; j < exps->size() && eval(exps->at(j)); ++j) ;
result = applyRestrictor(query->restrictor(), exps->size() == j);
} else
result = applyRestrictor(query->restrictor(), false);
}
return result;
}
static bool parseAspectRatio(CSSValue* value, int& h, int& v)
{
if (value->isValueList()){
CSSValueList* valueList = static_cast<CSSValueList*>(value);
if (valueList->length() == 3) {
CSSValue* i0 = valueList->item(0);
CSSValue* i1 = valueList->item(1);
CSSValue* i2 = valueList->item(2);
if (i0->isPrimitiveValue() && static_cast<CSSPrimitiveValue*>(i0)->primitiveType() == CSSPrimitiveValue::CSS_NUMBER
&& i1->isPrimitiveValue() && static_cast<CSSPrimitiveValue*>(i1)->primitiveType() == CSSPrimitiveValue::CSS_STRING
&& i2->isPrimitiveValue() && static_cast<CSSPrimitiveValue*>(i2)->primitiveType() == CSSPrimitiveValue::CSS_NUMBER) {
String str = static_cast<CSSPrimitiveValue*>(i1)->getStringValue();
if (!str.isNull() && str.length() == 1 && str[0] == '/') {
h = static_cast<CSSPrimitiveValue*>(i0)->getIntValue(CSSPrimitiveValue::CSS_NUMBER);
v = static_cast<CSSPrimitiveValue*>(i2)->getIntValue(CSSPrimitiveValue::CSS_NUMBER);
return true;
}
}
}
}
return false;
}
template<typename T>
bool compareValue(T a, T b, MediaFeaturePrefix op)
{
switch (op) {
case MinPrefix:
return a >= b;
case MaxPrefix:
return a <= b;
case NoPrefix:
return a == b;
}
return false;
}
static bool numberValue(CSSValue* value, float& result)
{
if (value->isPrimitiveValue()
&& static_cast<CSSPrimitiveValue*>(value)->primitiveType() == CSSPrimitiveValue::CSS_NUMBER) {
result = static_cast<CSSPrimitiveValue*>(value)->getFloatValue(CSSPrimitiveValue::CSS_NUMBER);
return true;
}
return false;
}
static bool colorMediaFeatureEval(CSSValue* value, RenderStyle* style, Page* page, MediaFeaturePrefix op)
{
int bitsPerComponent = screenDepthPerComponent(page->mainFrame()->view());
float number;
if (value)
return numberValue(value, number) && compareValue(bitsPerComponent, static_cast<int>(number), op);
return bitsPerComponent != 0;
}
static bool monochromeMediaFeatureEval(CSSValue* value, RenderStyle* style, Page* page, MediaFeaturePrefix op)
{
if (!screenIsMonochrome(page->mainFrame()->view()))
return false;
return colorMediaFeatureEval(value, style, page, op);
}
static bool device_aspect_ratioMediaFeatureEval(CSSValue* value, RenderStyle* style, Page* page, MediaFeaturePrefix op)
{
if (value) {
FloatRect sg = screenRect(page->mainFrame()->view());
int h = 0;
int v = 0;
if (parseAspectRatio(value, h, v))
return v != 0 && compareValue(static_cast<int>(sg.width()) * v, static_cast<int>(sg.height()) * h, op);
return false;
}
return true;
}
static bool device_pixel_ratioMediaFeatureEval(CSSValue *value, RenderStyle* style, Page* page, MediaFeaturePrefix op)
{
if (value)
return value->isPrimitiveValue() && compareValue(page->chrome()->scaleFactor(), static_cast<CSSPrimitiveValue*>(value)->getFloatValue(), op);
return page->chrome()->scaleFactor() != 0;
}
static bool gridMediaFeatureEval(CSSValue* value, RenderStyle* style, Page* page, MediaFeaturePrefix op)
{
float number;
if (value && numberValue(value, number))
return compareValue(static_cast<int>(number), 0, op);
return false;
}
static bool device_heightMediaFeatureEval(CSSValue* value, RenderStyle* style, Page* page, MediaFeaturePrefix op)
{
if (value) {
FloatRect sg = screenRect(page->mainFrame()->view());
return value->isPrimitiveValue() && compareValue(static_cast<int>(sg.height()), static_cast<CSSPrimitiveValue*>(value)->computeLengthInt(style), op);
}
return true;
}
static bool device_widthMediaFeatureEval(CSSValue* value, RenderStyle* style, Page* page, MediaFeaturePrefix op)
{
if (value) {
FloatRect sg = screenRect(page->mainFrame()->view());
return value->isPrimitiveValue() && compareValue(static_cast<int>(sg.width()), static_cast<CSSPrimitiveValue*>(value)->computeLengthInt(style), op);
}
return true;
}
static bool heightMediaFeatureEval(CSSValue* value, RenderStyle* style, Page* page, MediaFeaturePrefix op)
{
FrameView* view = page->mainFrame()->view();
if (value)
return value->isPrimitiveValue() && compareValue(view->visibleHeight(), static_cast<CSSPrimitiveValue*>(value)->computeLengthInt(style), op);
return view->visibleHeight() != 0;
}
static bool widthMediaFeatureEval(CSSValue* value, RenderStyle* style, Page* page, MediaFeaturePrefix op)
{
FrameView* view = page->mainFrame()->view();
if (value)
return value->isPrimitiveValue() && compareValue(view->visibleWidth(), static_cast<CSSPrimitiveValue*>(value)->computeLengthInt(style), op);
return view->visibleWidth() != 0;
}
static bool min_colorMediaFeatureEval(CSSValue* value, RenderStyle* style, Page* page, MediaFeaturePrefix )
{
return colorMediaFeatureEval(value, style, page, MinPrefix);
}
static bool max_colorMediaFeatureEval(CSSValue* value, RenderStyle* style, Page* page, MediaFeaturePrefix )
{
return colorMediaFeatureEval(value, style, page, MaxPrefix);
}
static bool min_monochromeMediaFeatureEval(CSSValue* value, RenderStyle* style, Page* page, MediaFeaturePrefix )
{
return monochromeMediaFeatureEval(value, style, page, MinPrefix);
}
static bool max_monochromeMediaFeatureEval(CSSValue* value, RenderStyle* style, Page* page, MediaFeaturePrefix )
{
return monochromeMediaFeatureEval(value, style, page, MaxPrefix);
}
static bool min_device_aspect_ratioMediaFeatureEval(CSSValue* value, RenderStyle* style, Page* page, MediaFeaturePrefix )
{
return device_aspect_ratioMediaFeatureEval(value, style, page, MinPrefix);
}
static bool max_device_aspect_ratioMediaFeatureEval(CSSValue* value, RenderStyle* style, Page* page, MediaFeaturePrefix )
{
return device_aspect_ratioMediaFeatureEval(value, style, page, MaxPrefix);
}
static bool min_device_pixel_ratioMediaFeatureEval(CSSValue* value, RenderStyle* style, Page* page, MediaFeaturePrefix )
{
return device_pixel_ratioMediaFeatureEval(value, style, page, MinPrefix);
}
static bool max_device_pixel_ratioMediaFeatureEval(CSSValue* value, RenderStyle* style, Page* page, MediaFeaturePrefix )
{
return device_pixel_ratioMediaFeatureEval(value, style, page, MaxPrefix);
}
static bool min_heightMediaFeatureEval(CSSValue* value, RenderStyle* style, Page* page, MediaFeaturePrefix )
{
return heightMediaFeatureEval(value, style, page, MinPrefix);
}
static bool max_heightMediaFeatureEval(CSSValue* value, RenderStyle* style, Page* page, MediaFeaturePrefix )
{
return heightMediaFeatureEval(value, style, page, MaxPrefix);
}
static bool min_widthMediaFeatureEval(CSSValue* value, RenderStyle* style, Page* page, MediaFeaturePrefix )
{
return widthMediaFeatureEval(value, style, page, MinPrefix);
}
static bool max_widthMediaFeatureEval(CSSValue* value, RenderStyle* style, Page* page, MediaFeaturePrefix )
{
return widthMediaFeatureEval(value, style, page, MaxPrefix);
}
static bool min_device_heightMediaFeatureEval(CSSValue* value, RenderStyle* style, Page* page, MediaFeaturePrefix )
{
return device_heightMediaFeatureEval(value, style, page, MinPrefix);
}
static bool max_device_heightMediaFeatureEval(CSSValue* value, RenderStyle* style, Page* page, MediaFeaturePrefix )
{
return device_heightMediaFeatureEval(value, style, page, MaxPrefix);
}
static bool min_device_widthMediaFeatureEval(CSSValue* value, RenderStyle* style, Page* page, MediaFeaturePrefix )
{
return device_widthMediaFeatureEval(value, style, page, MinPrefix);
}
static bool max_device_widthMediaFeatureEval(CSSValue* value, RenderStyle* style, Page* page, MediaFeaturePrefix )
{
return device_widthMediaFeatureEval(value, style, page, MaxPrefix);
}
static void createFunctionMap()
{
gFunctionMap = new FunctionMap;
#define ADD_TO_FUNCTIONMAP(name, str) \
gFunctionMap->set(name##MediaFeature.impl(), name##MediaFeatureEval);
CSS_MEDIAQUERY_NAMES_FOR_EACH_MEDIAFEATURE(ADD_TO_FUNCTIONMAP);
#undef ADD_TO_FUNCTIONMAP
}
bool MediaQueryEvaluator::eval(const MediaQueryExp* expr) const
{
if (!m_page || !m_style)
return m_expResult;
if (!gFunctionMap)
createFunctionMap();
EvalFunc func = gFunctionMap->get(expr->mediaFeature().impl());
if (func)
return func(expr->value(), m_style, m_page, NoPrefix);
return false;
}
}