Source/core/css/resolver/StyleBuilderConverter.cpp

/*
 * Copyright (C) 2013 Google Inc. All rights reserved.
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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#include "config.h"
#include "core/css/resolver/StyleBuilderConverter.h"

#include "core/css/CSSFunctionValue.h"
#include "core/css/CSSGridLineNamesValue.h"
#include "core/css/CSSPrimitiveValueMappings.h"
#include "core/css/CSSShadowValue.h"
#include "core/css/Pair.h"
#include "core/svg/SVGURIReference.h"

namespace WebCore {

namespace {

static GridLength convertGridTrackBreadth(const StyleResolverState& state, CSSPrimitiveValue* primitiveValue)
{
    if (primitiveValue->getValueID() == CSSValueMinContent)
        return Length(MinContent);

    if (primitiveValue->getValueID() == CSSValueMaxContent)
        return Length(MaxContent);

    // Fractional unit.
    if (primitiveValue->isFlex())
        return GridLength(primitiveValue->getDoubleValue());

    return primitiveValue->convertToLength<FixedConversion | PercentConversion | AutoConversion>(state.cssToLengthConversionData());
}

} // namespace

AtomicString StyleBuilderConverter::convertFragmentIdentifier(StyleResolverState& state, CSSValue* value)
{
    CSSPrimitiveValue* primitiveValue = toCSSPrimitiveValue(value);
    if (primitiveValue->isURI())
        return SVGURIReference::fragmentIdentifierFromIRIString(primitiveValue->getStringValue(), state.element()->treeScope());
    return nullAtom;
}

EGlyphOrientation StyleBuilderConverter::convertGlyphOrientation(StyleResolverState&, CSSValue* value)
{
    if (!value->isPrimitiveValue())
        return GO_0DEG;

    CSSPrimitiveValue* primitiveValue = toCSSPrimitiveValue(value);
    if (primitiveValue->primitiveType() != CSSPrimitiveValue::CSS_DEG)
        return GO_0DEG;

    float angle = fabsf(fmodf(primitiveValue->getFloatValue(), 360.0f));

    if (angle <= 45.0f || angle > 315.0f)
        return GO_0DEG;
    if (angle > 45.0f && angle <= 135.0f)
        return GO_90DEG;
    if (angle > 135.0f && angle <= 225.0f)
        return GO_180DEG;
    return GO_270DEG;
}


GridPosition StyleBuilderConverter::convertGridPosition(StyleResolverState&, CSSValue* value)
{
    // We accept the specification's grammar:
    // 'auto' | [ <integer> || <string> ] | [ span && [ <integer> || string ] ] | <ident>

    GridPosition position;

    if (value->isPrimitiveValue()) {
        CSSPrimitiveValue* primitiveValue = toCSSPrimitiveValue(value);
        // We translate <ident> to <string> during parsing as it
        // makes handling it more simple.
        if (primitiveValue->isString()) {
            position.setNamedGridArea(primitiveValue->getStringValue());
            return position;
        }

        ASSERT(primitiveValue->getValueID() == CSSValueAuto);
        return position;
    }

    CSSValueList* values = toCSSValueList(value);
    ASSERT(values->length());

    bool isSpanPosition = false;
    // The specification makes the <integer> optional, in which case it default to '1'.
    int gridLineNumber = 1;
    String gridLineName;

    CSSValueListIterator it = values;
    CSSPrimitiveValue* currentValue = toCSSPrimitiveValue(it.value());
    if (currentValue->getValueID() == CSSValueSpan) {
        isSpanPosition = true;
        it.advance();
        currentValue = it.hasMore() ? toCSSPrimitiveValue(it.value()) : 0;
    }

    if (currentValue && currentValue->isNumber()) {
        gridLineNumber = currentValue->getIntValue();
        it.advance();
        currentValue = it.hasMore() ? toCSSPrimitiveValue(it.value()) : 0;
    }

    if (currentValue && currentValue->isString()) {
        gridLineName = currentValue->getStringValue();
        it.advance();
    }

    ASSERT(!it.hasMore());
    if (isSpanPosition)
        position.setSpanPosition(gridLineNumber, gridLineName);
    else
        position.setExplicitPosition(gridLineNumber, gridLineName);

    return position;
}

GridTrackSize StyleBuilderConverter::convertGridTrackSize(StyleResolverState& state, CSSValue* value)
{
    if (value->isPrimitiveValue())
        return GridTrackSize(convertGridTrackBreadth(state, toCSSPrimitiveValue(value)));

    CSSFunctionValue* minmaxFunction = toCSSFunctionValue(value);
    CSSValueList* arguments = minmaxFunction->arguments();
    ASSERT_WITH_SECURITY_IMPLICATION(arguments->length() == 2);
    GridLength minTrackBreadth(convertGridTrackBreadth(state, toCSSPrimitiveValue(arguments->itemWithoutBoundsCheck(0))));
    GridLength maxTrackBreadth(convertGridTrackBreadth(state, toCSSPrimitiveValue(arguments->itemWithoutBoundsCheck(1))));
    return GridTrackSize(minTrackBreadth, maxTrackBreadth);
}

bool StyleBuilderConverter::convertGridTrackList(CSSValue* value, Vector<GridTrackSize>& trackSizes, NamedGridLinesMap& namedGridLines, OrderedNamedGridLines& orderedNamedGridLines, StyleResolverState& state)
{
    // Handle 'none'.
    if (value->isPrimitiveValue()) {
        CSSPrimitiveValue* primitiveValue = toCSSPrimitiveValue(value);
        return primitiveValue->getValueID() == CSSValueNone;
    }

    if (!value->isValueList())
        return false;

    size_t currentNamedGridLine = 0;
    for (CSSValueListIterator i = value; i.hasMore(); i.advance()) {
        CSSValue* currValue = i.value();
        if (currValue->isGridLineNamesValue()) {
            CSSGridLineNamesValue* lineNamesValue = toCSSGridLineNamesValue(currValue);
            for (CSSValueListIterator j = lineNamesValue; j.hasMore(); j.advance()) {
                String namedGridLine = toCSSPrimitiveValue(j.value())->getStringValue();
                NamedGridLinesMap::AddResult result = namedGridLines.add(namedGridLine, Vector<size_t>());
                result.storedValue->value.append(currentNamedGridLine);
                OrderedNamedGridLines::AddResult orderedInsertionResult = orderedNamedGridLines.add(currentNamedGridLine, Vector<String>());
                orderedInsertionResult.storedValue->value.append(namedGridLine);
            }
            continue;
        }

        ++currentNamedGridLine;
        trackSizes.append(convertGridTrackSize(state, currValue));
    }

    // The parser should have rejected any <track-list> without any <track-size> as
    // this is not conformant to the syntax.
    ASSERT(!trackSizes.isEmpty());
    return true;
}

Length StyleBuilderConverter::convertLength(StyleResolverState& state, CSSValue* value)
{
    CSSPrimitiveValue* primitiveValue = toCSSPrimitiveValue(value);
    Length result = primitiveValue->convertToLength<FixedConversion | PercentConversion>(state.cssToLengthConversionData());
    result.setQuirk(primitiveValue->isQuirkValue());
    return result;
}

Length StyleBuilderConverter::convertLengthOrAuto(StyleResolverState& state, CSSValue* value)
{
    CSSPrimitiveValue* primitiveValue = toCSSPrimitiveValue(value);
    Length result = primitiveValue->convertToLength<FixedConversion | PercentConversion | AutoConversion>(state.cssToLengthConversionData());
    result.setQuirk(primitiveValue->isQuirkValue());
    return result;
}

Length StyleBuilderConverter::convertLengthSizing(StyleResolverState& state, CSSValue* value)
{
    CSSPrimitiveValue* primitiveValue = toCSSPrimitiveValue(value);
    switch (primitiveValue->getValueID()) {
    case CSSValueInvalid:
        return convertLength(state, value);
    case CSSValueIntrinsic:
        return Length(Intrinsic);
    case CSSValueMinIntrinsic:
        return Length(MinIntrinsic);
    case CSSValueWebkitMinContent:
        return Length(MinContent);
    case CSSValueWebkitMaxContent:
        return Length(MaxContent);
    case CSSValueWebkitFillAvailable:
        return Length(FillAvailable);
    case CSSValueWebkitFitContent:
        return Length(FitContent);
    case CSSValueAuto:
        return Length(Auto);
    default:
        ASSERT_NOT_REACHED();
        return Length();
    }
}

Length StyleBuilderConverter::convertLengthMaxSizing(StyleResolverState& state, CSSValue* value)
{
    CSSPrimitiveValue* primitiveValue = toCSSPrimitiveValue(value);
    if (primitiveValue->getValueID() == CSSValueNone)
        return Length(Undefined);
    return convertLengthSizing(state, value);
}

LengthPoint StyleBuilderConverter::convertLengthPoint(StyleResolverState& state, CSSValue* value)
{
    CSSPrimitiveValue* primitiveValue = toCSSPrimitiveValue(value);
    Pair* pair = primitiveValue->getPairValue();
    Length x = pair->first()->convertToLength<FixedConversion | PercentConversion>(state.cssToLengthConversionData());
    Length y = pair->second()->convertToLength<FixedConversion | PercentConversion>(state.cssToLengthConversionData());
    return LengthPoint(x, y);
}

float StyleBuilderConverter::convertNumberOrPercentage(StyleResolverState& state, CSSValue* value)
{
    CSSPrimitiveValue* primitiveValue = toCSSPrimitiveValue(value);
    ASSERT(primitiveValue->isNumber() || primitiveValue->isPercentage());
    if (primitiveValue->isNumber())
        return primitiveValue->getFloatValue();
    return primitiveValue->getFloatValue() / 100.0f;
}

EPaintOrder StyleBuilderConverter::convertPaintOrder(StyleResolverState&, CSSValue* cssPaintOrder)
{
    if (cssPaintOrder->isValueList()) {
        int paintOrder = 0;
        CSSValueListInspector iter(cssPaintOrder);
        for (size_t i = 0; i < iter.length(); i++) {
            CSSPrimitiveValue* value = toCSSPrimitiveValue(iter.item(i));

            EPaintOrderType paintOrderType = PT_NONE;
            switch (value->getValueID()) {
            case CSSValueFill:
                paintOrderType = PT_FILL;
                break;
            case CSSValueStroke:
                paintOrderType = PT_STROKE;
                break;
            case CSSValueMarkers:
                paintOrderType = PT_MARKERS;
                break;
            default:
                ASSERT_NOT_REACHED();
                break;
            }

            paintOrder |= (paintOrderType << kPaintOrderBitwidth*i);
        }
        return (EPaintOrder)paintOrder;
    }

    return PO_NORMAL;
}

LengthSize StyleBuilderConverter::convertRadius(StyleResolverState& state, CSSValue* value)
{
    CSSPrimitiveValue* primitiveValue = toCSSPrimitiveValue(value);
    Pair* pair = primitiveValue->getPairValue();
    Length radiusWidth = pair->first()->convertToLength<FixedConversion | PercentConversion>(state.cssToLengthConversionData());
    Length radiusHeight = pair->second()->convertToLength<FixedConversion | PercentConversion>(state.cssToLengthConversionData());
    float width = radiusWidth.value();
    float height = radiusHeight.value();
    ASSERT(width >= 0 && height >= 0);
    if (width <= 0 || height <= 0)
        return LengthSize(Length(0, Fixed), Length(0, Fixed));
    return LengthSize(radiusWidth, radiusHeight);
}

PassRefPtr<ShadowList> StyleBuilderConverter::convertShadow(StyleResolverState& state, CSSValue* value)
{
    if (value->isPrimitiveValue()) {
        ASSERT(toCSSPrimitiveValue(value)->getValueID() == CSSValueNone);
        return PassRefPtr<ShadowList>();
    }

    const CSSValueList* valueList = toCSSValueList(value);
    size_t shadowCount = valueList->length();
    ShadowDataVector shadows;
    for (size_t i = 0; i < shadowCount; ++i) {
        const CSSShadowValue* item = toCSSShadowValue(valueList->item(i));
        float x = item->x->computeLength<float>(state.cssToLengthConversionData());
        float y = item->y->computeLength<float>(state.cssToLengthConversionData());
        float blur = item->blur ? item->blur->computeLength<float>(state.cssToLengthConversionData()) : 0;
        float spread = item->spread ? item->spread->computeLength<float>(state.cssToLengthConversionData()) : 0;
        ShadowStyle shadowStyle = item->style && item->style->getValueID() == CSSValueInset ? Inset : Normal;
        Color color;
        if (item->color)
            color = state.document().textLinkColors().colorFromPrimitiveValue(item->color.get(), state.style()->color());
        else
            color = state.style()->color();
        shadows.append(ShadowData(FloatPoint(x, y), blur, spread, shadowStyle, color));
    }
    return ShadowList::adopt(shadows);
}

float StyleBuilderConverter::convertSpacing(StyleResolverState& state, CSSValue* value)
{
    CSSPrimitiveValue* primitiveValue = toCSSPrimitiveValue(value);
    if (primitiveValue->getValueID() == CSSValueNormal)
        return 0;
    if (state.useSVGZoomRules())
        return primitiveValue->computeLength<float>(state.cssToLengthConversionData().copyWithAdjustedZoom(1));
    return primitiveValue->computeLength<float>(state.cssToLengthConversionData());
}

PassRefPtr<SVGLengthList> StyleBuilderConverter::convertStrokeDasharray(StyleResolverState&, CSSValue* value)
{
    if (!value->isValueList()) {
        return SVGRenderStyle::initialStrokeDashArray();
    }

    CSSValueList* dashes = toCSSValueList(value);

    RefPtr<SVGLengthList> array = SVGLengthList::create();
    size_t length = dashes->length();
    for (size_t i = 0; i < length; ++i) {
        CSSValue* currValue = dashes->itemWithoutBoundsCheck(i);
        if (!currValue->isPrimitiveValue())
            continue;

        CSSPrimitiveValue* dash = toCSSPrimitiveValue(dashes->itemWithoutBoundsCheck(i));
        array->append(SVGLength::fromCSSPrimitiveValue(dash));
    }

    return array.release();
}

Color StyleBuilderConverter::convertSVGColor(StyleResolverState& state, CSSValue* value)
{
    CSSPrimitiveValue* primitiveValue = toCSSPrimitiveValue(value);
    if (primitiveValue->isRGBColor())
        return primitiveValue->getRGBA32Value();
    ASSERT(primitiveValue->getValueID() == CSSValueCurrentcolor);
    return state.style()->color();
}

PassRefPtr<SVGLength> StyleBuilderConverter::convertSVGLength(StyleResolverState&, CSSValue* value)
{
    return SVGLength::fromCSSPrimitiveValue(toCSSPrimitiveValue(value));
}

} // namespace WebCore