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/* This file is part of KDevelop
* Copyright 2011 David Nolden <david.nolden.kdevelop@art-master.de>
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; see the file COPYING. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#include "formattinghelpers.h"
#include "debug.h"
#include <QString>
namespace KDevelop {
///Matches the given prefix to the given text, ignoring all whitespace
///Returns -1 if mismatched, else the position in @p text where the @p prefix match ends
int matchPrefixIgnoringWhitespace(const QString& text, const QString& prefix, const QString& fuzzyCharacters)
{
int prefixPos = 0;
int textPos = 0;
while (prefixPos < prefix.length() && textPos < text.length()) {
skipWhiteSpace:
while (prefixPos < prefix.length() && prefix[prefixPos].isSpace())
++prefixPos;
while (textPos < text.length() && text[textPos].isSpace())
++textPos;
if (prefixPos == prefix.length() || textPos == text.length())
break;
if (prefix[prefixPos] != text[textPos]) {
bool skippedFuzzy = false;
while (prefixPos < prefix.length() && fuzzyCharacters.indexOf(prefix[prefixPos]) != -1) {
++prefixPos;
skippedFuzzy = true;
}
while (textPos < text.length() && fuzzyCharacters.indexOf(text[textPos]) != -1) {
++textPos;
skippedFuzzy = true;
}
if (skippedFuzzy)
goto skipWhiteSpace;
return -1;
}
++prefixPos;
++textPos;
}
return textPos;
}
static QString reverse(const QString& str)
{
QString ret;
ret.reserve(str.length());
for (int a = str.length() - 1; a >= 0; --a)
ret.append(str[a]);
return ret;
}
// Returns the text start position with all whitespace that is redundant in the given context skipped
int skipRedundantWhiteSpace(const QString& context, const QString& text, int tabWidth)
{
if (context.isEmpty() || !context[context.size() - 1].isSpace() || text.isEmpty() || !text[0].isSpace())
return 0;
int textPosition = 0;
// Extract trailing whitespace in the context
int contextPosition = context.size() - 1;
while (contextPosition > 0 && context[contextPosition - 1].isSpace())
--contextPosition;
int textWhitespaceEnd = 0;
while (textWhitespaceEnd < text.size() && text[textWhitespaceEnd].isSpace())
++textWhitespaceEnd;
QString contextWhiteSpace = context.mid(contextPosition);
contextPosition = 0;
QString textWhiteSpace = text.left(textWhitespaceEnd);
// Step 1: Remove redundant newlines
while (contextWhiteSpace.contains(QLatin1Char('\n')) && textWhiteSpace.contains(QLatin1Char('\n'))) {
int contextOffset = contextWhiteSpace.indexOf(QLatin1Char('\n')) + 1;
int textOffset = textWhiteSpace.indexOf(QLatin1Char('\n')) + 1;
contextPosition += contextOffset;
contextWhiteSpace.remove(0, contextOffset);
textPosition += textOffset;
textWhiteSpace.remove(0, textOffset);
}
int contextOffset = 0;
int textOffset = 0;
// Skip redundant ordinary whitespace
while (contextOffset < contextWhiteSpace.size() && textOffset < textWhiteSpace.size() &&
contextWhiteSpace[contextOffset].isSpace() && contextWhiteSpace[contextOffset] != QLatin1Char('\n') &&
textWhiteSpace[textOffset].isSpace() && textWhiteSpace[textOffset] != QLatin1Char('\n')) {
bool contextWasTab = contextWhiteSpace[contextOffset] == QLatin1Char('\t');
bool textWasTab = textWhiteSpace[contextOffset] == QLatin1Char('\t');
++contextOffset;
++textOffset;
if (contextWasTab != textWasTab) {
// Problem: We have a mismatch of tabs and/or ordinary whitespaces
if (contextWasTab) {
for (int s = 1; s < tabWidth; ++s)
if (textOffset < textWhiteSpace.size() && textWhiteSpace[textOffset] == QLatin1Char(' '))
++textOffset;
} else if (textWasTab) {
for (int s = 1; s < tabWidth; ++s)
if (contextOffset < contextWhiteSpace.size() &&
contextWhiteSpace[contextOffset] == QLatin1Char(' '))
++contextOffset;
}
}
}
return textPosition + textOffset;
}
QString extractFormattedTextFromContext(const QString& _formattedMergedText, const QString& text,
const QString& leftContext, const QString& rightContext, int tabWidth,
const QString& fuzzyCharacters)
{
QString formattedMergedText = _formattedMergedText;
//Now remove "leftContext" and "rightContext" from the sides
if (!leftContext.isEmpty()) {
int endOfLeftContext = matchPrefixIgnoringWhitespace(formattedMergedText, leftContext, QString());
if (endOfLeftContext == -1) {
// Try 2: Ignore the fuzzy characters while matching
endOfLeftContext = matchPrefixIgnoringWhitespace(formattedMergedText, leftContext, fuzzyCharacters);
if (endOfLeftContext == -1) {
qCWarning(UTIL) << "problem matching the left context";
return text;
}
}
int startOfWhiteSpace = endOfLeftContext;
// Include all leading whitespace
while (startOfWhiteSpace > 0 && formattedMergedText[startOfWhiteSpace - 1].isSpace())
--startOfWhiteSpace;
formattedMergedText = formattedMergedText.mid(startOfWhiteSpace);
int skip = skipRedundantWhiteSpace(leftContext, formattedMergedText, tabWidth);
formattedMergedText = formattedMergedText.mid(skip);
}
if (!rightContext.isEmpty()) {
//Add a whitespace behind the text for matching, so that we definitely capture all trailing whitespace
int endOfText = matchPrefixIgnoringWhitespace(formattedMergedText, text + QLatin1Char(' '), QString());
if (endOfText == -1) {
// Try 2: Ignore the fuzzy characters while matching
endOfText = matchPrefixIgnoringWhitespace(formattedMergedText, text + QLatin1Char(' '), fuzzyCharacters);
if (endOfText == -1) {
qCWarning(UTIL) << "problem matching the text while formatting";
return text;
}
}
formattedMergedText.truncate(endOfText);
int skip = skipRedundantWhiteSpace(reverse(rightContext), reverse(formattedMergedText), tabWidth);
formattedMergedText.chop(skip);
}
return formattedMergedText;
}
}
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