Bug 25868

Summary: Frame::markAllMatchesForText prematurely aborts while highlighting text
Product: WebKit Reporter: Finnur Thorarinsson <finnur.webkit>
Component: New BugsAssignee: Nobody <webkit-unassigned>
Status: UNCONFIRMED ---    
Severity: Normal CC: mitz
Priority: P2    
Version: 528+ (Nightly build)   
Hardware: PC   
OS: All   

Description Finnur Thorarinsson 2009-05-19 10:39:00 PDT
I can easily reproduce a problem with highlighting in Frame::markAllMatchesForText. 

The problem is this:

On certain HTML files, the markAllMatchesForText is aborted before reaching the end (resulting in failure to highlight matches). 

A superficial look through the annotations lead me to a bug titled "Searching in text areas" (https://bugs.webkit.org/show_bug.cgi?id=7023), which was fixed and I think causes this.

I have a reduced HTML code that I use to reproduce this bug:

<!doctype html>
  <input type=text value="html"> 
  Call markAllMatchesForText with html[space] and it should highlight these words: html html done.

Note that <input type=text> has the string "html" in it.

If you call markAllMatchesForText for "html " (note the trailing space) on this frame, it will break and not highlight anything (see comment). Observe my comment in the snippet below, which is where it breaks.

unsigned Frame::markAllMatchesForText(const String& target, bool caseFlag, unsigned limit)
    if (target.isEmpty())
        return 0;
    RefPtr<Range> searchRange(rangeOfContents(document()));
    ExceptionCode exception = 0;
    unsigned matchCount = 0;
    do {
        RefPtr<Range> resultRange(findPlainText(searchRange.get(), target, true, caseFlag));
        if (resultRange->collapsed(exception)) {
            if (!resultRange->startContainer()->isInShadowTree())
                break;  //  <<  NOTE: THIS IS WHERE IT ABORTS.

If it is easy to fix, feel free to suggest changes to this code that will make this work and I would be happy to try it out in my tree and submit a patch (if it works).