[Webkit-unassigned] [Bug 24419] New: WordAwareIterator not working in WebCore/editing/Editor.cpp

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Thu Mar 5 22:26:41 PST 2009


           Summary: WordAwareIterator not working in
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: WebCore Misc.
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: diegoe at gnome.org

So in WebCore/editing/Editor.cpp there's the code calling checkSpellingOfString
of the current backend, while implementing the one for GTK+ I realized that
this code (and I might be wrong) should be handling me the string analyzed
/word by word/ and not as a whole.
- wrong:
            client->checkSpellingOfString("helol john", len,
&misspellingLocation, &misspellingLength);
- right:
            client->checkSpellingOfString("helol", len, &misspellingLocation,
(second iteration)
            client->checkSpellingOfString("john", len, &misspellingLocation,

I base my theory in the name of the text iterator (WordAwareIterator?) and that
there's a while() loop for calling checkSpellingOfString with an .advance()
method and a check for .atEnd(). If this was not supposed to split by word,
then why the while()? why .advance() the iterator?.

Based on all that, I suggest that this is a bug in the text iterator and that
it should actually be giving me words and not the full phrase.

static String findFirstMisspellingInRange(EditorClient* client, Range*
searchRange, int& firstMisspellingOffset, bool markAll)
    ASSERT_ARG(client, client);
    ASSERT_ARG(searchRange, searchRange);

    WordAwareIterator it(searchRange);
    firstMisspellingOffset = 0;

    String firstMisspelling;
    int currentChunkOffset = 0;

    while (!it.atEnd()) {
        const UChar* chars = it.characters();
        int len = it.length();

        // Skip some work for one-space-char hunks
        if (!(len == 1 && chars[0] == ' ')) {

            int misspellingLocation = -1;
            int misspellingLength = 0;
            client->checkSpellingOfString(chars, len, &misspellingLocation,

            // 5490627 shows that there was some code path here where the
String constructor below crashes.
            // We don't know exactly what combination of bad input caused this,
so we're making this much
            // more robust against bad input on release builds.
            ASSERT(misspellingLength >= 0);
            ASSERT(misspellingLocation >= -1);
            ASSERT(misspellingLength == 0 || misspellingLocation >= 0);
            ASSERT(misspellingLocation < len);
            ASSERT(misspellingLength <= len);
            ASSERT(misspellingLocation + misspellingLength <= len);

            if (misspellingLocation >= 0 && misspellingLength > 0 &&
misspellingLocation < len && misspellingLength <= len && misspellingLocation +
misspellingLength <= len) {

                // Remember first-encountered misspelling and its offset
                if (!firstMisspelling) {
                    firstMisspellingOffset = currentChunkOffset +
                    firstMisspelling = String(chars + misspellingLocation,

                // Mark this instance if we're marking all instances. Otherwise
bail out because we found the first one.
                if (!markAll)

                // Compute range of misspelled word
                RefPtr<Range> misspellingRange =
TextIterator::subrange(searchRange, currentChunkOffset + misspellingLocation,

                // Store marker for misspelled word
                ExceptionCode ec = 0;
                ASSERT(ec == 0);

        currentChunkOffset += len;

    return firstMisspelling;

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