Simple line layout: Move leading whitespace handling from removeTrailingWhitespace() to initializeNewLine().

[zalan]

This is in preparation to make FlowContents as iterator class.

[zalan]

Created attachment 245112 [details]
WIP patch.

[zalan]

Created attachment 245183 [details]
Patch

[zalan]

Created attachment 245198 [details]
Patch

[Antti Koivisto]

Comment on attachment 245198 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=245198&action=review

> Source/WebCore/rendering/SimpleLineLayout.cpp:334
> +    // Remove collapsed whitespace, or non-collapsed pre-wrap whitepsace, unless it's the only content on the line -so removing the whitesapce would produce an empty line.
> +    if (!(style.collapseWhitespace || (preWrap(style) && !lineState.hasWhitespaceOnly())))

This is bit difficult to read with all the !s. Maybe have a sensibly named boolean helper?

> Source/WebCore/rendering/SimpleLineLayout.cpp:385
> +    if (overflowedFragment.isEmpty()) {
>          unsigned spaceCount = 0;
> -        lineState.jumpTo(flowContents.style().collapseWhitespace ? flowContents.findNextNonWhitespacePosition(previousLine.position, spaceCount) : previousLine.position, 0);
> +        lineState.jumpTo(style.collapseWhitespace ? flowContents.findNextNonWhitespacePosition(linePositon, spaceCount) : linePositon, 0);
> +    } else if (lineState.fits(overflowedFragment.width))
> +        lineState.addUncommitted(overflowedFragment);
> +    else {
> +        // Start over with this fragment.
> +        lineState.jumpTo(overflowedFragment.start, 0);
>      }
>      return lineState;

This would read better with early returns. No need for else branches.

[zalan]

Created attachment 245200 [details]
Patch

[WebKit Commit Bot]

Comment on attachment 245200 [details]
Patch

Clearing flags on attachment: 245200

Committed r178983: <http://trac.webkit.org/changeset/178983>

[WebKit Commit Bot]

All reviewed patches have been landed.  Closing bug.