[css-grid] Store lines instead of tracks in GridResolvedPosition

third_party/WebKit/Source/core/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/style/GridResolvedPosition.h"
 
 #include "core/layout/LayoutBox.h"
 #include "core/style/GridCoordinate.h"
 
@@ skipping 54 matching lines @@
 GridSpan GridResolvedPosition::resolveGridPositionsFromAutoPlacementPosition(const ComputedStyle& gridContainerStyle, const LayoutBox& gridItem, GridTrackSizingDirection direction, const GridResolvedPosition& resolvedInitialPosition)
 {
     GridPosition initialPosition, finalPosition;
     initialAndFinalPositionsFromStyle(gridContainerStyle, gridItem, direction, initialPosition, finalPosition);
 
     GridPositionSide finalSide = finalPositionSide(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;
+    GridResolvedPosition resolvedFinalPosition = resolvedInitialPosition.next();
 
     if (initialPosition.isSpan())
         return *resolveGridPositionAgainstOppositePosition(gridContainerStyle, resolvedInitialPosition, initialPosition, finalSide);
     if (finalPosition.isSpan())
         return *resolveGridPositionAgainstOppositePosition(gridContainerStyle, resolvedInitialPosition, finalPosition, finalSide);
 
     return GridSpan(resolvedInitialPosition, resolvedFinalPosition);
 }
 
 PassOwnPtr<GridSpan> GridResolvedPosition::resolveGridPositionsFromStyle(const ComputedStyle& gridContainerStyle, const LayoutBox& gridItem, GridTrackSizingDirection direction)
@@ skipping 18 matching lines @@
     if (finalPosition.shouldBeResolvedAgainstOppositePosition()) {
         // Infer our position from the initial position ('1 / auto' or '3 / span 2' case).
         GridResolvedPosition initialResolvedPosition = resolveGridPositionFromStyle(gridContainerStyle, initialPosition, initialSide);
         return resolveGridPositionAgainstOppositePosition(gridContainerStyle, initialResolvedPosition, finalPosition, finalSide);
     }
 
     GridResolvedPosition resolvedInitialPosition = resolveGridPositionFromStyle(gridContainerStyle, initialPosition, initialSide);
     GridResolvedPosition resolvedFinalPosition = resolveGridPositionFromStyle(gridContainerStyle, finalPosition, finalSide);
 
     // If 'grid-after' specifies a line at or before that specified by 'grid-before', it computes to 'span 1'.
-    if (resolvedFinalPosition < resolvedInitialPosition)
-        resolvedFinalPosition = resolvedInitialPosition;
+    if (resolvedFinalPosition <= resolvedInitialPosition)
+        resolvedFinalPosition = resolvedInitialPosition.next();
 
     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);
+        return lastLine;
     }
 
     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);
+    return it->value[namedGridLineIndex];
 }
 
 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);
+            return position.integerPosition() - 1;
 
         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);
+        return endOfTrack - resolvedPosition;
     }
     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);
+            return implicitLineIter->value[0];
 
         // 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);
+            return explicitLineIter->value[0];
 
         // 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);
+    if (position.isAuto()) {
+        if ((side == ColumnStartSide || side == RowStartSide) && resolvedOppositePosition.toInt())
+            return GridSpan::create(resolvedOppositePosition.prev(), resolvedOppositePosition);
+        return GridSpan::create(resolvedOppositePosition, resolvedOppositePosition.next());
+    }
 
     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);
+    if (it == gridLinesNames.end()) {
+        if ((side == ColumnStartSide || side == RowStartSide) && resolvedOppositePosition.toInt())
+            return GridSpan::create(resolvedOppositePosition.prev(), resolvedOppositePosition);
+        return GridSpan::create(resolvedOppositePosition, resolvedOppositePosition.next());
+    }
 
     return GridSpan::createWithNamedSpanAgainstOpposite(resolvedOppositePosition, position, side, it->value);
 }
 
 } // namespace blink