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C++: fix invalid common prefix calculation.

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This was the indirect cause for "random" freezes when using
code-completion. The direct cause was a while loop counting down to 0,
but starting with a negative value. Both are fixed now.

Task-number: QTCREATORBUG-8472
Task-number: QTCREATORBUG-8532
Change-Id: I782a46be3ac8282d7484d0bf0c6fd30be6b171c8
Reviewed-by: Christian Kandeler <christian.kandeler@digia.com>
Reviewed-by: Kai Koehne <kai.koehne@digia.com>
This commit is contained in:
Erik Verbruggen
2013-01-10 16:41:14 +01:00
committed by Kai Koehne
parent 1675beebf3
commit 6ce9a80afa
2 changed files with 16 additions and 11 deletions
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2
src/plugins/cpptools/cppcompletionassist.cpp
View File

@@ -344,7 +344,7 @@ void CppAssistProposalItem::applyContextualContent(TextEditor::BaseTextEditor *e
if (!inEditor.isEmpty()) {
preserveLength = toInsert.length() - (editor->position() - basePosition);
const int inEditorLength = inEditor.length();
while (preserveLength) {
while (preserveLength > 0) {
if (inEditor.startsWith(toInsert.right(preserveLength))
&& (inEditorLength == preserveLength
|| (!inEditor.at(preserveLength).isLetterOrNumber()

25
src/plugins/texteditor/codeassist/basicproposalitemlistmodel.cpp
View File

@@ -271,22 +271,27 @@ bool BasicProposalItemListModel::keepPerfectMatch(AssistReason reason) const
QString BasicProposalItemListModel::proposalPrefix() const
{
if (m_currentItems.size() >= kMaxPrefixFilter)
if (m_currentItems.size() >= kMaxPrefixFilter || m_currentItems.isEmpty())
return QString();
// Compute common prefix
QString firstKey = m_currentItems.first()->text();
QString lastKey = m_currentItems.last()->text();
const int length = qMin(firstKey.length(), lastKey.length());
firstKey.truncate(length);
lastKey.truncate(length);
QString commonPrefix = m_currentItems.first()->text();
for (int i = 1, ei = m_currentItems.size(); i < ei; ++i) {
QString nextItem = m_currentItems.at(i)->text();
const int length = qMin(commonPrefix.length(), nextItem.length());
commonPrefix.truncate(length);
nextItem.truncate(length);
while (firstKey != lastKey) {
firstKey.chop(1);
lastKey.chop(1);
while (commonPrefix != nextItem) {
commonPrefix.chop(1);
nextItem.chop(1);
}
if (commonPrefix.isEmpty()) // there is no common prefix, so return.
return commonPrefix;
}
return firstKey;
return commonPrefix;
}
IAssistProposalItem *BasicProposalItemListModel::proposalItem(int index) const