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fakevim: Emulate Vim regexp more precisely

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Change-Id: Ia951f6e10d0e8d19e8d7d4b2a696eb9277ce6201
Reviewed-by: hjk <qthjk@ovi.com>
This commit is contained in:
Lukas Holecek
2012-08-01 14:42:13 +02:00
committed by hjk
parent d0dcd40635
commit 6544ed2f00
1 changed files with 122 additions and 17 deletions
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139
src/plugins/fakevim/fakevimhandler.cpp
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@@ -3916,22 +3916,121 @@ bool FakeVimHandler::Private::handleExPluginCommand(const ExCommand &cmd)
return handled;
}
static QRegExp vimPatternToQtPattern(QString needle, QTextDocument::FindFlags *flags)
static QRegExp vimPatternToQtPattern(QString needle)
{
// FIXME: Rough mapping of a common case.
if (needle.startsWith(_("\\<")) && needle.endsWith(_("\\>")))
(*flags) |= QTextDocument::FindWholeWords;
needle.remove(_("\\<")); // start of word
needle.remove(_("\\>")); // end of word
/* Trasformations (Vim regexp -> QRegExp):
* \a -> [A-Za-z]
* \A -> [^A-Za-z]
* \h -> [A-Za-z_]
* \H -> [^A-Za-z_]
* \l -> [a-z]
* \L -> [^a-z]
* \o -> [0-7]
* \O -> [^0-7]
* \u -> [A-Z]
* \U -> [^A-Z]
* \x -> [0-9A-Fa-f]
* \X -> [^0-9A-Fa-f]
*
* \< -> \b
* \> -> \b
* [] -> \[\]
* \= -> ?
*
* (...) <-> \(...\)
* {...} <-> \{...\}
* | <-> \|
* ? <-> \?
* + <-> \+
* \{...} -> {...}
*
* \c - set ignorecase for rest
* \C - set noignorecase for rest
*/
// TODO: Set initial value and handle smartcase option.
bool ignorecase = false;
QString pattern;
pattern.reserve(2 * needle.size());
// QRegExp's | and \| have the opposite meaning of vim's.
QString dummy(QLatin1Char(1));
needle.replace(_("\\|"), dummy);
needle.replace(_("|"), _("\\|"));
needle.replace(dummy, _("|"));
bool escape = false;
bool brace = false;
bool curly = false;
foreach (const QChar &c, needle) {
if (brace) {
brace = false;
if (c == ']') {
pattern.append(_("\\[\\]"));
continue;
} else {
pattern.append('[');
}
}
if (QString("(){}+|?").indexOf(c) != -1) {
if (c == '{') {
curly = escape;
} else if (c == '}' && curly) {
curly = false;
escape = true;
}
//qDebug() << "NEEDLE " << needle << needle;
return QRegExp(needle);
if (escape)
escape = false;
else
pattern.append('\\');
pattern.append(c);
} else if (escape) {
// escape expression
escape = false;
if (c == '<' || c == '>')
pattern.append(_("\\b"));
else if (c == 'a')
pattern.append(_("[a-zA-Z]"));
else if (c == 'A')
pattern.append(_("[^a-zA-Z]"));
else if (c == 'h')
pattern.append(_("[A-Za-z_]"));
else if (c == 'H')
pattern.append(_("[^A-Za-z_]"));
else if (c == 'c' || c == 'C')
ignorecase = (c == 'c');
else if (c == 'l')
pattern.append(_("[a-z]"));
else if (c == 'L')
pattern.append(_("[^a-z]"));
else if (c == 'o')
pattern.append(_("[0-7]"));
else if (c == 'O')
pattern.append(_("[^0-7]"));
else if (c == 'u')
pattern.append(_("[A-Z]"));
else if (c == 'U')
pattern.append(_("[^A-Z]"));
else if (c == 'x')
pattern.append(_("[0-9A-Fa-f]"));
else if (c == 'X')
pattern.append(_("[^0-9A-Fa-f]"));
else if (c == '=')
pattern.append(_("?"));
else
pattern.append('\\' + c);
} else {
// unescaped expression
if (c == '\\')
escape = true;
else if (c == '[')
brace = true;
else if (c.isLetter() && ignorecase)
pattern.append('[' + c.toLower() + c.toUpper() + ']');
else
pattern.append(c);
}
}
if (escape)
pattern.append('\\');
else if (brace)
pattern.append('[');
return QRegExp(pattern);
}
void FakeVimHandler::Private::searchBalanced(bool forward, QChar needle, QChar other)
@@ -3975,7 +4074,7 @@ void FakeVimHandler::Private::search(const SearchData &sd)
if (!sd.forward)
flags |= QTextDocument::FindBackward;
QRegExp needleExp = vimPatternToQtPattern(sd.needle, &flags);
QRegExp needleExp = vimPatternToQtPattern(sd.needle);
const int oldLine = cursorLine() - cursorLineOnScreen();
@@ -4036,10 +4135,16 @@ void FakeVimHandler::Private::highlightMatches(const QString &needle)
QTextCursor tc = cursor();
tc.movePosition(StartOfDocument, MoveAnchor);
QTextDocument::FindFlags flags = QTextDocument::FindCaseSensitively;
QRegExp needleExp = vimPatternToQtPattern(needle, &flags);
QRegExp needleExp = vimPatternToQtPattern(needle);
if (!needleExp.isValid()) {
QString error = needleExp.errorString();
showRedMessage(
FakeVimHandler::tr("Invalid regular expression: %1").arg(error));
return;
}
while (!tc.atEnd()) {
tc = tc.document()->find(needleExp, tc.position(), flags);
tc = tc.document()->find(needleExp, tc.position());
if (tc.isNull())
break;
if (!tc.hasSelection())