Move core/layout/style to core/style

Source/core/layout/style/GridResolvedPosition.cpp

-// Copyright 2014 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "config.h"
-#include "core/layout/style/GridResolvedPosition.h"
-
-#include "core/layout/LayoutBox.h"
-#include "core/layout/style/GridCoordinate.h"
-
-namespace blink {
-
-static const NamedGridLinesMap& gridLinesForSide(const ComputedStyle& style, GridPositionSide side)
-{
-    return (side == ColumnStartSide || side == ColumnEndSide) ? style.namedGridColumnLines() : style.namedGridRowLines();
-}
-
-static inline String implicitNamedGridLineForSide(const String& lineName, GridPositionSide side)
-{
-    return lineName + ((side == ColumnStartSide || side == RowStartSide) ? "-start" : "-end");
-}
-
-static bool isValidNamedLineOrArea(const String& lineName, const ComputedStyle& style, GridPositionSide side)
-{
-    const NamedGridLinesMap& gridLineNames = gridLinesForSide(style, side);
-
-    return gridLineNames.contains(implicitNamedGridLineForSide(lineName, side)) || gridLineNames.contains(lineName);
-}
-
-static GridPositionSide calculateInitialPositionSide(GridTrackSizingDirection direction)
-{
-    return (direction == ForColumns) ? ColumnStartSide : RowStartSide;
-}
-
-static GridPositionSide calculateFinalPositionSide(GridTrackSizingDirection direction)
-{
-    return (direction == ForColumns) ? ColumnEndSide : RowEndSide;
-}
-
-void GridResolvedPosition::initialAndFinalPositionsFromStyle(const ComputedStyle& gridContainerStyle, const LayoutBox& gridItem, GridTrackSizingDirection direction, GridPosition& initialPosition, GridPosition& finalPosition)
-{
-    initialPosition = (direction == ForColumns) ? gridItem.style()->gridColumnStart() : gridItem.style()->gridRowStart();
-    finalPosition = (direction == ForColumns) ? gridItem.style()->gridColumnEnd() : gridItem.style()->gridRowEnd();
-    GridPositionSide initialPositionSide = calculateInitialPositionSide(direction);
-    GridPositionSide finalPositionSide = calculateFinalPositionSide(direction);
-
-    // We must handle the placement error handling code here instead of in the StyleAdjuster because we don't want to
-    // overwrite the specified values.
-    if (initialPosition.isSpan() && finalPosition.isSpan())
-        finalPosition.setAutoPosition();
-
-    // Try to early detect the case of non existing named grid lines. This way we could assume later that
-    // GridResolvedPosition::resolveGrisPositionFromStyle() always return a valid resolved position.
-    if (initialPosition.isNamedGridArea() && !isValidNamedLineOrArea(initialPosition.namedGridLine(), gridContainerStyle, initialPositionSide))
-        initialPosition.setAutoPosition();
-
-    if (finalPosition.isNamedGridArea() && !isValidNamedLineOrArea(finalPosition.namedGridLine(), gridContainerStyle, finalPositionSide))
-        finalPosition.setAutoPosition();
-
-    // If the grid item has an automatic position and a grid span for a named line in a given dimension, instead treat the grid span as one.
-    if (initialPosition.isAuto() && finalPosition.isSpan() && !finalPosition.namedGridLine().isNull())
-        finalPosition.setSpanPosition(1, String());
-    if (finalPosition.isAuto() && initialPosition.isSpan() && !initialPosition.namedGridLine().isNull())
-        initialPosition.setSpanPosition(1, String());
-}
-
-GridSpan GridResolvedPosition::resolveGridPositionsFromAutoPlacementPosition(const ComputedStyle& gridContainerStyle, const LayoutBox& gridItem, GridTrackSizingDirection direction, const GridResolvedPosition& resolvedInitialPosition)
-{
-    GridPosition initialPosition, finalPosition;
-    initialAndFinalPositionsFromStyle(gridContainerStyle, gridItem, direction, initialPosition, finalPosition);
-
-    GridPositionSide finalPositionSide = calculateFinalPositionSide(direction);
-
-    // This method will only be used when both positions need to be resolved against the opposite one.
-    ASSERT(initialPosition.shouldBeResolvedAgainstOppositePosition() && finalPosition.shouldBeResolvedAgainstOppositePosition());
-
-    GridResolvedPosition resolvedFinalPosition = resolvedInitialPosition;
-
-    if (initialPosition.isSpan())
-        return *resolveGridPositionAgainstOppositePosition(gridContainerStyle, resolvedInitialPosition, initialPosition, finalPositionSide);
-    if (finalPosition.isSpan())
-        return *resolveGridPositionAgainstOppositePosition(gridContainerStyle, resolvedInitialPosition, finalPosition, finalPositionSide);
-
-    return GridSpan(resolvedInitialPosition, resolvedFinalPosition);
-}
-
-PassOwnPtr<GridSpan> GridResolvedPosition::resolveGridPositionsFromStyle(const ComputedStyle& gridContainerStyle, const LayoutBox& gridItem, GridTrackSizingDirection direction)
-{
-    GridPosition initialPosition, finalPosition;
-    initialAndFinalPositionsFromStyle(gridContainerStyle, gridItem, direction, initialPosition, finalPosition);
-
-    GridPositionSide initialPositionSide = calculateInitialPositionSide(direction);
-    GridPositionSide finalPositionSide = calculateFinalPositionSide(direction);
-
-    if (initialPosition.shouldBeResolvedAgainstOppositePosition() && finalPosition.shouldBeResolvedAgainstOppositePosition()) {
-        // We can't get our grid positions without running the auto placement algorithm.
-        return nullptr;
-    }
-
-    if (initialPosition.shouldBeResolvedAgainstOppositePosition()) {
-        // Infer the position from the final position ('auto / 1' or 'span 2 / 3' case).
-        GridResolvedPosition finalResolvedPosition = resolveGridPositionFromStyle(gridContainerStyle, finalPosition, finalPositionSide);
-        return resolveGridPositionAgainstOppositePosition(gridContainerStyle, finalResolvedPosition, initialPosition, initialPositionSide);
-    }
-
-    if (finalPosition.shouldBeResolvedAgainstOppositePosition()) {
-        // Infer our position from the initial position ('1 / auto' or '3 / span 2' case).
-        GridResolvedPosition initialResolvedPosition = resolveGridPositionFromStyle(gridContainerStyle, initialPosition, initialPositionSide);
-        return resolveGridPositionAgainstOppositePosition(gridContainerStyle, initialResolvedPosition, finalPosition, finalPositionSide);
-    }
-
-    GridResolvedPosition resolvedInitialPosition = resolveGridPositionFromStyle(gridContainerStyle, initialPosition, initialPositionSide);
-    GridResolvedPosition resolvedFinalPosition = resolveGridPositionFromStyle(gridContainerStyle, finalPosition, finalPositionSide);
-
-    // If 'grid-after' specifies a line at or before that specified by 'grid-before', it computes to 'span 1'.
-    if (resolvedFinalPosition < resolvedInitialPosition)
-        resolvedFinalPosition = resolvedInitialPosition;
-
-    return adoptPtr(new GridSpan(resolvedInitialPosition, resolvedFinalPosition));
-}
-
-size_t GridResolvedPosition::explicitGridColumnCount(const ComputedStyle& gridContainerStyle)
-{
-    return std::min(gridContainerStyle.gridTemplateColumns().size(), kGridMaxTracks);
-}
-
-size_t GridResolvedPosition::explicitGridRowCount(const ComputedStyle& gridContainerStyle)
-{
-    return std::min(gridContainerStyle.gridTemplateRows().size(), kGridMaxTracks);
-}
-
-size_t GridResolvedPosition::explicitGridSizeForSide(const ComputedStyle& gridContainerStyle, GridPositionSide side)
-{
-    return (side == ColumnStartSide || side == ColumnEndSide) ? explicitGridColumnCount(gridContainerStyle) : explicitGridRowCount(gridContainerStyle);
-}
-
-GridResolvedPosition GridResolvedPosition::resolveNamedGridLinePositionFromStyle(const ComputedStyle& gridContainerStyle, const GridPosition& position, GridPositionSide side)
-{
-    ASSERT(!position.namedGridLine().isNull());
-
-    const NamedGridLinesMap& gridLinesNames = gridLinesForSide(gridContainerStyle, side);
-    NamedGridLinesMap::const_iterator it = gridLinesNames.find(position.namedGridLine());
-    if (it == gridLinesNames.end()) {
-        if (position.isPositive())
-            return GridResolvedPosition(0);
-        const size_t lastLine = explicitGridSizeForSide(gridContainerStyle, side);
-        return adjustGridPositionForSide(lastLine, side);
-    }
-
-    size_t namedGridLineIndex;
-    if (position.isPositive())
-        namedGridLineIndex = std::min<size_t>(position.integerPosition(), it->value.size()) - 1;
-    else
-        namedGridLineIndex = std::max<int>(it->value.size() - abs(position.integerPosition()), 0);
-    return adjustGridPositionForSide(it->value[namedGridLineIndex], side);
-}
-
-GridResolvedPosition GridResolvedPosition::resolveGridPositionFromStyle(const ComputedStyle& gridContainerStyle, const GridPosition& position, GridPositionSide side)
-{
-    switch (position.type()) {
-    case ExplicitPosition: {
-        ASSERT(position.integerPosition());
-
-        if (!position.namedGridLine().isNull())
-            return resolveNamedGridLinePositionFromStyle(gridContainerStyle, position, side);
-
-        // Handle <integer> explicit position.
-        if (position.isPositive())
-            return adjustGridPositionForSide(position.integerPosition() - 1, side);
-
-        size_t resolvedPosition = abs(position.integerPosition()) - 1;
-        const size_t endOfTrack = explicitGridSizeForSide(gridContainerStyle, side);
-
-        // Per http://lists.w3.org/Archives/Public/www-style/2013Mar/0589.html, we clamp negative value to the first line.
-        if (endOfTrack < resolvedPosition)
-            return GridResolvedPosition(0);
-
-        return adjustGridPositionForSide(endOfTrack - resolvedPosition, side);
-    }
-    case NamedGridAreaPosition:
-    {
-        // First attempt to match the grid area's edge to a named grid area: if there is a named line with the name
-        // ''<custom-ident>-start (for grid-*-start) / <custom-ident>-end'' (for grid-*-end), contributes the first such
-        // line to the grid item's placement.
-        String namedGridLine = position.namedGridLine();
-        ASSERT(isValidNamedLineOrArea(namedGridLine, gridContainerStyle, side));
-
-        const NamedGridLinesMap& gridLineNames = gridLinesForSide(gridContainerStyle, side);
-        NamedGridLinesMap::const_iterator implicitLineIter = gridLineNames.find(implicitNamedGridLineForSide(namedGridLine, side));
-        if (implicitLineIter != gridLineNames.end())
-            return adjustGridPositionForSide(implicitLineIter->value[0], side);
-
-        // Otherwise, if there is a named line with the specified name, contributes the first such line to the grid
-        // item's placement.
-        NamedGridLinesMap::const_iterator explicitLineIter = gridLineNames.find(namedGridLine);
-        if (explicitLineIter != gridLineNames.end())
-            return adjustGridPositionForSide(explicitLineIter->value[0], side);
-
-        // If none of the above works specs mandate us to treat it as auto BUT we should have detected it before calling
-        // this function in GridResolvedPosition::resolveGridPositionsFromStyle(). We should be also covered by the
-        // ASSERT at the beginning of this block.
-        ASSERT_NOT_REACHED();
-        return GridResolvedPosition(0);
-    }
-    case AutoPosition:
-    case SpanPosition:
-        // 'auto' and span depend on the opposite position for resolution (e.g. grid-row: auto / 1 or grid-column: span 3 / "myHeader").
-        ASSERT_NOT_REACHED();
-        return GridResolvedPosition(0);
-    }
-    ASSERT_NOT_REACHED();
-    return GridResolvedPosition(0);
-}
-
-PassOwnPtr<GridSpan> GridResolvedPosition::resolveGridPositionAgainstOppositePosition(const ComputedStyle& gridContainerStyle, const GridResolvedPosition& resolvedOppositePosition, const GridPosition& position, GridPositionSide side)
-{
-    if (position.isAuto())
-        return GridSpan::create(resolvedOppositePosition, resolvedOppositePosition);
-
-    ASSERT(position.isSpan());
-    ASSERT(position.spanPosition() > 0);
-
-    if (!position.namedGridLine().isNull()) {
-        // span 2 'c' -> we need to find the appropriate grid line before / after our opposite position.
-        return resolveNamedGridLinePositionAgainstOppositePosition(gridContainerStyle, resolvedOppositePosition, position, side);
-    }
-
-    return GridSpan::createWithSpanAgainstOpposite(resolvedOppositePosition, position, side);
-}
-
-PassOwnPtr<GridSpan> GridResolvedPosition::resolveNamedGridLinePositionAgainstOppositePosition(const ComputedStyle& gridContainerStyle, const GridResolvedPosition& resolvedOppositePosition, const GridPosition& position, GridPositionSide side)
-{
-    ASSERT(position.isSpan());
-    ASSERT(!position.namedGridLine().isNull());
-    // Negative positions are not allowed per the specification and should have been handled during parsing.
-    ASSERT(position.spanPosition() > 0);
-
-    const NamedGridLinesMap& gridLinesNames = gridLinesForSide(gridContainerStyle, side);
-    NamedGridLinesMap::const_iterator it = gridLinesNames.find(position.namedGridLine());
-
-    // If there is no named grid line of that name, we resolve the position to 'auto' (which is equivalent to 'span 1' in this case).
-    // See http://lists.w3.org/Archives/Public/www-style/2013Jun/0394.html.
-    if (it == gridLinesNames.end())
-        return GridSpan::create(resolvedOppositePosition, resolvedOppositePosition);
-
-    return GridSpan::createWithNamedSpanAgainstOpposite(resolvedOppositePosition, position, side, it->value);
-}
-
-} // namespace blink