[css-grid] Implement repeat(auto-fit)

third_party/WebKit/Source/core/style/GridPositionsResolver.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 "GridPositionsResolver.h"
 
 #include "core/layout/LayoutBox.h"
 #include "core/style/GridArea.h"
 #include <algorithm>
 
@@ skipping 16 matching lines @@
     bool isRowAxis = direction == ForColumns;
     const NamedGridLinesMap& gridLineNames = isRowAxis ? gridContainerStyle.namedGridColumnLines() : gridContainerStyle.namedGridRowLines();
     const NamedGridLinesMap& autoRepeatGridLineNames = isRowAxis ? gridContainerStyle.autoRepeatNamedGridColumnLines() : gridContainerStyle.autoRepeatNamedGridRowLines();
 
     if (!gridLineNames.isEmpty()) {
         auto it = gridLineNames.find(namedLine);
         m_namedLinesIndexes = it == gridLineNames.end() ? nullptr : &it->value;
     }
 
     if (!autoRepeatGridLineNames.isEmpty()) {
-        auto it = autoRepeatGridLineNames.find(namedLine);
+        auto it = m_repetitions ? autoRepeatGridLineNames.find(namedLine) : autoRepeatGridLineNames.end();
         m_autoRepeatNamedLinesIndexes = it == autoRepeatGridLineNames.end() ? nullptr : &it->value;
     }
 
     m_insertionPoint = isRowAxis ? gridContainerStyle.gridAutoRepeatColumnsInsertionPoint() : gridContainerStyle.gridAutoRepeatRowsInsertionPoint();
 }
 
 bool NamedLineCollection::isValidNamedLineOrArea(const String& namedLine, const ComputedStyle& gridContainerStyle, GridPositionSide side)
 {
     bool isRowAxis = directionFromSide(side) == ForColumns;
     const NamedGridLinesMap& gridLineNames = isRowAxis ? gridContainerStyle.namedGridColumnLines() : gridContainerStyle.namedGridRowLines();
@@ skipping 272 matching lines @@
         NamedLineCollection implicitLines(gridContainerStyle, implicitNamedGridLineForSide(namedGridLine, side), directionFromSide(side), lastLine, autoRepeatTracksCount);
         if (implicitLines.hasNamedLines())
             return implicitLines.firstPosition();
 
         // Otherwise, if there is a named line with the specified name, contributes the first such line to the grid
         // item's placement.
         NamedLineCollection explicitLines(gridContainerStyle, namedGridLine, directionFromSide(side), lastLine, autoRepeatTracksCount);
         if (explicitLines.hasNamedLines())
             return explicitLines.firstPosition();
 
-        ASSERT(!NamedLineCollection::isValidNamedLineOrArea(namedGridLine, gridContainerStyle, side));
+        DCHECK(!NamedLineCollection::isValidNamedLineOrArea(namedGridLine, gridContainerStyle, side) || !autoRepeatTracksCount);
         // If none of the above works specs mandate to assume that all the lines in the implicit grid have this name.
         return lastLine + 1;
     }
     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 0;
     }
     ASSERT_NOT_REACHED();
@@ skipping 30 matching lines @@
 
     if (endLine < startLine)
         std::swap(endLine, startLine);
     else if (endLine == startLine)
         endLine = startLine + 1;
 
     return GridSpan::untranslatedDefiniteGridSpan(startLine, endLine);
 }
 
 } // namespace blink