/**************************************************************************** ** ** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies). ** Contact: http://www.qt-project.org/legal ** ** This file is part of the tools applications of the Qt Toolkit. ** ** $QT_BEGIN_LICENSE:LGPL21$ ** Commercial License Usage ** Licensees holding valid commercial Qt licenses may use this file in ** accordance with the commercial license agreement provided with the ** Software or, alternatively, in accordance with the terms contained in ** a written agreement between you and Digia. For licensing terms and ** conditions see http://qt.digia.com/licensing. For further information ** use the contact form at http://qt.digia.com/contact-us. ** ** GNU Lesser General Public License Usage ** Alternatively, this file may be used under the terms of the GNU Lesser ** General Public License version 2.1 or version 3 as published by the Free ** Software Foundation and appearing in the file LICENSE.LGPLv21 and ** LICENSE.LGPLv3 included in the packaging of this file. Please review the ** following information to ensure the GNU Lesser General Public License ** requirements will be met: https://www.gnu.org/licenses/lgpl.html and ** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. ** ** In addition, as a special exception, Digia gives you certain additional ** rights. These rights are described in the Digia Qt LGPL Exception ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. ** ** $QT_END_LICENSE$ ** ****************************************************************************/ /* This file is a self-contained interactive indenter for C++ and Qt Script. The general problem of indenting a C++ program is ill posed. On the one hand, an indenter has to analyze programs written in a free-form formal language that is best described in terms of tokens, not characters, not lines. On the other hand, indentation applies to lines and white space characters matter, and otherwise the programs to indent are formally invalid in general, as they are begin edited. The approach taken here works line by line. We receive a program consisting of N lines or more, and we want to compute the indentation appropriate for the Nth line. Lines beyond the Nth lines are of no concern to us, so for simplicity we pretend the program has exactly N lines and we call the Nth line the "bottom line". Typically, we have to indent the bottom line when it's still empty, so we concentrate our analysis on the N - 1 lines that precede. By inspecting the (N - 1)-th line, the (N - 2)-th line, ... backwards, we determine the kind of the bottom line and indent it accordingly. * The bottom line is a comment line. See bottomLineStartsInCComment() and indentWhenBottomLineStartsInCComment(). * The bottom line is a continuation line. See isContinuationLine() and indentForContinuationLine(). * The bottom line is a standalone line. See indentForStandaloneLine(). Certain tokens that influence the indentation, notably braces, are looked for in the lines. This is done by simple string comparison, without a real tokenizer. Confusing constructs such as comments and string literals are removed beforehand. */ #include #include QT_BEGIN_NAMESPACE /* qmake ignore Q_OBJECT */ /* The indenter avoids getting stuck in almost infinite loops by imposing arbitrary limits on the number of lines it analyzes when looking for a construct. For example, the indenter never considers more than BigRoof lines backwards when looking for the start of a C-style comment. */ static const int SmallRoof = 40; static const int BigRoof = 400; /* The indenter supports a few parameters: * ppHardwareTabSize is the size of a '\t' in your favorite editor. * ppIndentSize is the size of an indentation, or software tab size. * ppContinuationIndentSize is the extra indent for a continuation line, when there is nothing to align against on the previous line. * ppCommentOffset is the indentation within a C-style comment, when it cannot be picked up. */ static int ppHardwareTabSize = 8; static int ppIndentSize = 4; static int ppContinuationIndentSize = 8; static const int ppCommentOffset = 2; void setTabSize( int size ) { ppHardwareTabSize = size; } void setIndentSize( int size ) { ppIndentSize = size; ppContinuationIndentSize = 2 * size; } static QRegExp *literal = 0; static QRegExp *label = 0; static QRegExp *inlineCComment = 0; static QRegExp *braceX = 0; static QRegExp *iflikeKeyword = 0; /* Returns the first non-space character in the string t, or QChar::Null if the string is made only of white space. */ static QChar firstNonWhiteSpace( const QString& t ) { int i = 0; while ( i < (int) t.length() ) { if ( !t[i].isSpace() ) return t[i]; i++; } return QChar::Null; } /* Returns \c true if string t is made only of white space; otherwise returns \c false. */ static bool isOnlyWhiteSpace( const QString& t ) { return firstNonWhiteSpace( t ).isNull(); } /* Assuming string t is a line, returns the column number of a given index. Column numbers and index are identical for strings that don't contain '\t's. */ int columnForIndex( const QString& t, int index ) { int col = 0; if ( index > (int) t.length() ) index = t.length(); for ( int i = 0; i < index; i++ ) { if ( t[i] == QChar('\t') ) { col = ( (col / ppHardwareTabSize) + 1 ) * ppHardwareTabSize; } else { col++; } } return col; } /* Returns the indentation size of string t. */ int indentOfLine( const QString& t ) { return columnForIndex( t, t.indexOf(firstNonWhiteSpace(t)) ); } /* Replaces t[k] by ch, unless t[k] is '\t'. Tab characters are better left alone since they break the "index equals column" rule. No provisions are taken against '\n' or '\r', which shouldn't occur in t anyway. */ static inline void eraseChar( QString& t, int k, QChar ch ) { if ( t[k] != '\t' ) t[k] = ch; } /* Removes some nefast constructs from a code line and returns the resulting line. */ static QString trimmedCodeLine( const QString& t ) { QString trimmed = t; int k; /* Replace character and string literals by X's, since they may contain confusing characters (such as '{' and ';'). "Hello!" is replaced by XXXXXXXX. The literals are rigourously of the same length before and after; otherwise, we would break alignment of continuation lines. */ k = 0; while ( (k = trimmed.indexOf(*literal, k)) != -1 ) { for ( int i = 0; i < literal->matchedLength(); i++ ) eraseChar( trimmed, k + i, 'X' ); k += literal->matchedLength(); } /* Replace inline C-style comments by spaces. Other comments are handled elsewhere. */ k = 0; while ( (k = trimmed.indexOf(*inlineCComment, k)) != -1 ) { for ( int i = 0; i < inlineCComment->matchedLength(); i++ ) eraseChar( trimmed, k + i, ' ' ); k += inlineCComment->matchedLength(); } /* Replace goto and switch labels by whitespace, but be careful with this case: foo1: bar1; bar2; */ while ( trimmed.lastIndexOf(':') != -1 && trimmed.indexOf(*label) != -1 ) { QString cap1 = label->cap( 1 ); int pos1 = label->pos( 1 ); int stop = cap1.length(); if ( pos1 + stop < (int) trimmed.length() && ppIndentSize < stop ) stop = ppIndentSize; int i = 0; while ( i < stop ) { eraseChar( trimmed, pos1 + i, ' ' ); i++; } while ( i < (int) cap1.length() ) { eraseChar( trimmed, pos1 + i, ';' ); i++; } } /* Remove C++-style comments. */ k = trimmed.indexOf( "//" ); if ( k != -1 ) trimmed.truncate( k ); return trimmed; } /* Returns '(' if the last parenthesis is opening, ')' if it is closing, and QChar::Null if there are no parentheses in t. */ static inline QChar lastParen( const QString& t ) { int i = t.length(); while ( i > 0 ) { i--; if ( t[i] == QChar('(') || t[i] == QChar(')') ) return t[i]; } return QChar::Null; } /* Returns \c true if typedIn the same as okayCh or is null; otherwise returns \c false. */ static inline bool okay( QChar typedIn, QChar okayCh ) { return typedIn == QChar::Null || typedIn == okayCh; } /* The "linizer" is a group of functions and variables to iterate through the source code of the program to indent. The program is given as a list of strings, with the bottom line being the line to indent. The actual program might contain extra lines, but those are uninteresting and not passed over to us. */ struct LinizerState { QString line; int braceDepth; bool leftBraceFollows; QStringList::ConstIterator iter; bool inCComment; bool pendingRightBrace; }; static QStringList *yyProgram = 0; static LinizerState *yyLinizerState = 0; // shorthands static const QString *yyLine = 0; static const int *yyBraceDepth = 0; static const bool *yyLeftBraceFollows = 0; /* Saves and restores the state of the global linizer. This enables backtracking. */ #define YY_SAVE() \ LinizerState savedState = *yyLinizerState #define YY_RESTORE() \ *yyLinizerState = savedState /* Advances to the previous line in yyProgram and update yyLine accordingly. yyLine is cleaned from comments and other damageable constructs. Empty lines are skipped. */ static bool readLine() { int k; yyLinizerState->leftBraceFollows = ( firstNonWhiteSpace(yyLinizerState->line) == QChar('{') ); do { if ( yyLinizerState->iter == yyProgram->constBegin() ) { yyLinizerState->line.clear(); return false; } --yyLinizerState->iter; yyLinizerState->line = *yyLinizerState->iter; yyLinizerState->line = trimmedCodeLine( yyLinizerState->line ); /* Remove C-style comments that span multiple lines. If the bottom line starts in a C-style comment, we are not aware of that and eventually yyLine will contain a slash-aster. Notice that both if's can be executed, since yyLinizerState->inCComment is potentially set to false in the first if. The order of the if's is also important. */ if ( yyLinizerState->inCComment ) { QString slashAster( "/*" ); k = yyLinizerState->line.indexOf( slashAster ); if ( k == -1 ) { yyLinizerState->line.clear(); } else { yyLinizerState->line.truncate( k ); yyLinizerState->inCComment = false; } } if ( !yyLinizerState->inCComment ) { QString asterSlash( "*/" ); k = yyLinizerState->line.indexOf( asterSlash ); if ( k != -1 ) { for ( int i = 0; i < k + 2; i++ ) eraseChar( yyLinizerState->line, i, ' ' ); yyLinizerState->inCComment = true; } } /* Remove preprocessor directives. */ k = 0; while ( k < (int) yyLinizerState->line.length() ) { QChar ch = yyLinizerState->line[k]; if ( ch == QChar('#') ) { yyLinizerState->line.clear(); } else if ( !ch.isSpace() ) { break; } k++; } /* Remove trailing spaces. */ k = yyLinizerState->line.length(); while ( k > 0 && yyLinizerState->line[k - 1].isSpace() ) k--; yyLinizerState->line.truncate( k ); /* '}' increment the brace depth and '{' decrements it and not the other way around, as we are parsing backwards. */ yyLinizerState->braceDepth += yyLinizerState->line.count( '}' ) - yyLinizerState->line.count( '{' ); /* We use a dirty trick for } else ... We don't count the '}' yet, so that it's more or less equivalent to the friendly construct } else ... */ if ( yyLinizerState->pendingRightBrace ) yyLinizerState->braceDepth++; yyLinizerState->pendingRightBrace = ( yyLinizerState->line.indexOf(*braceX) == 0 ); if ( yyLinizerState->pendingRightBrace ) yyLinizerState->braceDepth--; } while ( yyLinizerState->line.isEmpty() ); return true; } /* Resets the linizer to its initial state, with yyLine containing the line above the bottom line of the program. */ static void startLinizer() { yyLinizerState->braceDepth = 0; yyLinizerState->inCComment = false; yyLinizerState->pendingRightBrace = false; yyLine = &yyLinizerState->line; yyBraceDepth = &yyLinizerState->braceDepth; yyLeftBraceFollows = &yyLinizerState->leftBraceFollows; yyLinizerState->iter = yyProgram->constEnd(); --yyLinizerState->iter; yyLinizerState->line = *yyLinizerState->iter; readLine(); } /* Returns \c true if the start of the bottom line of yyProgram (and potentially the whole line) is part of a C-style comment; otherwise returns \c false. */ static bool bottomLineStartsInCComment() { QString slashAster( "/*" ); QString asterSlash( "*/" ); /* We could use the linizer here, but that would slow us down terribly. We are better to trim only the code lines we need. */ QStringList::ConstIterator p = yyProgram->constEnd(); --p; // skip bottom line for ( int i = 0; i < BigRoof; i++ ) { if ( p == yyProgram->constBegin() ) return false; --p; if ( (*p).indexOf(slashAster) != -1 || (*p).indexOf(asterSlash) != -1 ) { QString trimmed = trimmedCodeLine( *p ); if ( trimmed.indexOf(slashAster) != -1 ) { return true; } else if ( trimmed.indexOf(asterSlash) != -1 ) { return false; } } } return false; } /* Returns the recommended indent for the bottom line of yyProgram assuming that it starts in a C-style comment, a condition that is tested elsewhere. Essentially, we're trying to align against some text on the previous line. */ static int indentWhenBottomLineStartsInCComment() { int k = yyLine->lastIndexOf( "/*" ); if ( k == -1 ) { /* We found a normal text line in a comment. Align the bottom line with the text on this line. */ return indentOfLine( *yyLine ); } else { /* The C-style comment starts on this line. If there is text on the same line, align with it. Otherwise, align with the slash-aster plus a given offset. */ int indent = columnForIndex( *yyLine, k ); k += 2; while ( k < (int) yyLine->length() ) { if ( !(*yyLine)[k].isSpace() ) return columnForIndex( *yyLine, k ); k++; } return indent + ppCommentOffset; } } /* A function called match...() modifies the linizer state. If it returns \c true, yyLine is the top line of the matched construct; otherwise, the linizer is left in an unknown state. A function called is...() keeps the linizer state intact. */ /* Returns \c true if the current line (and upwards) forms a braceless control statement; otherwise returns \c false. The first line of the following example is a "braceless control statement": if ( x ) y; */ static bool matchBracelessControlStatement() { int delimDepth = 0; if ( yyLine->endsWith("else") ) return true; if ( !yyLine->endsWith(QLatin1Char(')')) ) return false; for ( int i = 0; i < SmallRoof; i++ ) { int j = yyLine->length(); while ( j > 0 ) { j--; QChar ch = (*yyLine)[j]; switch ( ch.unicode() ) { case ')': delimDepth++; break; case '(': delimDepth--; if ( delimDepth == 0 ) { if ( yyLine->indexOf(*iflikeKeyword) != -1 ) { /* We have if ( x ) y "if ( x )" is not part of the statement "y". */ return true; } } if ( delimDepth == -1 ) { /* We have if ( (1 + 2) and not if ( 1 + 2 ) */ return false; } break; case '{': case '}': case ';': /* We met a statement separator, but not where we expected it. What follows is probably a weird continuation line. Be careful with ';' in for, though. */ if ( ch != QChar(';') || delimDepth == 0 ) return false; } } if ( !readLine() ) break; } return false; } /* Returns \c true if yyLine is an unfinished line; otherwise returns false. In many places we'll use the terms "standalone line", "unfinished line" and "continuation line". The meaning of these should be evident from this code example: a = b; // standalone line c = d + // unfinished line e + // unfinished continuation line f + // unfinished continuation line g; // continuation line */ static bool isUnfinishedLine() { bool unf = false; YY_SAVE(); if ( yyLine->isEmpty() ) return false; QChar lastCh = (*yyLine)[(int) yyLine->length() - 1]; if ( QString("{};").indexOf(lastCh) == -1 && !yyLine->endsWith("...") ) { /* It doesn't end with ';' or similar. If it's neither "Q_OBJECT" nor "if ( x )", it must be an unfinished line. */ unf = ( yyLine->indexOf("Q_OBJECT") == -1 && !matchBracelessControlStatement() ); } else if ( lastCh == QChar(';') ) { if ( lastParen(*yyLine) == QChar('(') ) { /* Exception: for ( int i = 1; i < 10; */ unf = true; } else if ( readLine() && yyLine->endsWith(QLatin1Char(';')) && lastParen(*yyLine) == QChar('(') ) { /* Exception: for ( int i = 1; i < 10; */ unf = true; } } YY_RESTORE(); return unf; } /* Returns \c true if yyLine is a continuation line; otherwise returns false. */ static bool isContinuationLine() { bool cont = false; YY_SAVE(); if ( readLine() ) cont = isUnfinishedLine(); YY_RESTORE(); return cont; } /* Returns the recommended indent for the bottom line of yyProgram, assuming it's a continuation line. We're trying to align the continuation line against some parenthesis or other bracked left opened on a previous line, or some interesting operator such as '='. */ static int indentForContinuationLine() { int braceDepth = 0; int delimDepth = 0; bool leftBraceFollowed = *yyLeftBraceFollows; for ( int i = 0; i < SmallRoof; i++ ) { int hook = -1; int j = yyLine->length(); while ( j > 0 && hook < 0 ) { j--; QChar ch = (*yyLine)[j]; switch ( ch.unicode() ) { case ')': case ']': delimDepth++; break; case '}': braceDepth++; break; case '(': case '[': delimDepth--; /* An unclosed delimiter is a good place to align at, at least for some styles (including Qt's). */ if ( delimDepth == -1 ) hook = j; break; case '{': braceDepth--; /* A left brace followed by other stuff on the same line is typically for an enum or an initializer. Such a brace must be treated just like the other delimiters. */ if ( braceDepth == -1 ) { if ( j < (int) yyLine->length() - 1 ) { hook = j; } else { return 0; // shouldn't happen } } break; case '=': /* An equal sign is a very natural alignment hook because it's usually the operator with the lowest precedence in statements it appears in. Case in point: int x = 1 + 2; However, we have to beware of constructs such as default arguments and explicit enum constant values: void foo( int x = 0, int y = 0 ); And not void foo( int x = 0, int y = 0 ); These constructs are caracterized by a ',' at the end of the unfinished lines or by unbalanced parentheses. */ if ( QString("!=<>").indexOf((*yyLine)[j - 1]) == -1 && (*yyLine)[j + 1] != '=' ) { if ( braceDepth == 0 && delimDepth == 0 && j < (int) yyLine->length() - 1 && !yyLine->endsWith(QLatin1Char(',')) && (yyLine->contains('(') == yyLine->contains(')')) ) hook = j; } } } if ( hook >= 0 ) { /* Yes, we have a delimiter or an operator to align against! We don't really align against it, but rather against the following token, if any. In this example, the following token is "11": int x = ( 11 + 2 ); If there is no such token, we use a continuation indent: static QRegExp foo( QString( "foo foo foo foo foo foo foo foo foo") ); */ hook++; while ( hook < (int) yyLine->length() ) { if ( !(*yyLine)[hook].isSpace() ) return columnForIndex( *yyLine, hook ); hook++; } return indentOfLine( *yyLine ) + ppContinuationIndentSize; } if ( braceDepth != 0 ) break; /* The line's delimiters are balanced. It looks like a continuation line or something. */ if ( delimDepth == 0 ) { if ( leftBraceFollowed ) { /* We have int main() { or Bar::Bar() : Foo( x ) { The "{" should be flush left. */ if ( !isContinuationLine() ) return indentOfLine( *yyLine ); } else if ( isContinuationLine() || yyLine->endsWith(QLatin1Char(',')) ) { /* We have x = a + b + c; or int t[] = { 1, 2, 3, 4, 5, 6 The "c;" should fall right under the "b +", and the "4, 5, 6" right under the "1, 2, 3,". */ return indentOfLine( *yyLine ); } else { /* We have stream << 1 + 2; We could, but we don't, try to analyze which operator has precedence over which and so on, to obtain the excellent result stream << 1 + 2; We do have a special trick above for the assignment operator above, though. */ return indentOfLine( *yyLine ) + ppContinuationIndentSize; } } if ( !readLine() ) break; } return 0; } /* Returns the recommended indent for the bottom line of yyProgram if that line is standalone (or should be indented likewise). Indenting a standalone line is tricky, mostly because of braceless control statements. Grossly, we are looking backwards for a special line, a "hook line", that we can use as a starting point to indent, and then modify the indentation level according to the braces met along the way to that hook. Let's consider a few examples. In all cases, we want to indent the bottom line. Example 1: x = 1; y = 2; The hook line is "x = 1;". We met 0 opening braces and 0 closing braces. Therefore, "y = 2;" inherits the indent of "x = 1;". Example 2: if ( x ) { y; The hook line is "if ( x ) {". No matter what precedes it, "y;" has to be indented one level deeper than the hook line, since we met one opening brace along the way. Example 3: if ( a ) while ( b ) { c; } d; To indent "d;" correctly, we have to go as far as the "if ( a )". Compare with if ( a ) { while ( b ) { c; } d; Still, we're striving to go back as little as possible to accommodate people with irregular indentation schemes. A hook line near at hand is much more reliable than a remote one. */ static int indentForStandaloneLine() { for ( int i = 0; i < SmallRoof; i++ ) { if ( !*yyLeftBraceFollows ) { YY_SAVE(); if ( matchBracelessControlStatement() ) { /* The situation is this, and we want to indent "z;": if ( x && y ) z; yyLine is "if ( x &&". */ return indentOfLine( *yyLine ) + ppIndentSize; } YY_RESTORE(); } if ( yyLine->endsWith(QLatin1Char(';')) || yyLine->contains('{') ) { /* The situation is possibly this, and we want to indent "z;": while ( x ) y; z; We return the indent of "while ( x )". In place of "y;", any arbitrarily complex compound statement can appear. */ if ( *yyBraceDepth > 0 ) { do { if ( !readLine() ) break; } while ( *yyBraceDepth > 0 ); } LinizerState hookState; while ( isContinuationLine() ) readLine(); hookState = *yyLinizerState; readLine(); if ( *yyBraceDepth <= 0 ) { do { if ( !matchBracelessControlStatement() ) break; hookState = *yyLinizerState; } while ( readLine() ); } *yyLinizerState = hookState; while ( isContinuationLine() ) readLine(); /* Never trust lines containing only '{' or '}', as some people (Richard M. Stallman) format them weirdly. */ if ( yyLine->trimmed().length() > 1 ) return indentOfLine( *yyLine ) - *yyBraceDepth * ppIndentSize; } if ( !readLine() ) return -*yyBraceDepth * ppIndentSize; } return 0; } /* Constructs global variables used by the indenter. */ static void initializeIndenter() { literal = new QRegExp( "([\"'])(?:\\\\.|[^\\\\])*\\1" ); literal->setMinimal( true ); label = new QRegExp( "^\\s*((?:case\\b([^:]|::)+|[a-zA-Z_0-9]+)(?:\\s+slots)?:)(?!:)" ); inlineCComment = new QRegExp( "/\\*.*\\*/" ); inlineCComment->setMinimal( true ); braceX = new QRegExp( "^\\s*\\}\\s*(?:else|catch)\\b" ); iflikeKeyword = new QRegExp( "\\b(?:catch|do|for|if|while)\\b" ); yyLinizerState = new LinizerState; } /* Destroys global variables used by the indenter. */ static void terminateIndenter() { delete literal; delete label; delete inlineCComment; delete braceX; delete iflikeKeyword; delete yyLinizerState; } /* Returns the recommended indent for the bottom line of program. Unless null, typedIn stores the character of yyProgram that triggered reindentation. This function works better if typedIn is set properly; it is slightly more conservative if typedIn is completely wild, and slighly more liberal if typedIn is always null. The user might be annoyed by the liberal behavior. */ int indentForBottomLine( const QStringList& program, QChar typedIn ) { if ( program.isEmpty() ) return 0; initializeIndenter(); yyProgram = new QStringList( program ); startLinizer(); const QString& bottomLine = program.last(); QChar firstCh = firstNonWhiteSpace( bottomLine ); int indent; if ( bottomLineStartsInCComment() ) { /* The bottom line starts in a C-style comment. Indent it smartly, unless the user has already played around with it, in which case it's better to leave her stuff alone. */ if ( isOnlyWhiteSpace(bottomLine) ) { indent = indentWhenBottomLineStartsInCComment(); } else { indent = indentOfLine( bottomLine ); } } else if ( okay(typedIn, '#') && firstCh == QChar('#') ) { /* Preprocessor directives go flush left. */ indent = 0; } else { if ( isUnfinishedLine() ) { indent = indentForContinuationLine(); } else { indent = indentForStandaloneLine(); } if ( okay(typedIn, '}') && firstCh == QChar('}') ) { /* A closing brace is one level more to the left than the code it follows. */ indent -= ppIndentSize; } else if ( okay(typedIn, ':') ) { QRegExp caseLabel( "\\s*(?:case\\b(?:[^:]|::)+" "|(?:public|protected|private|signals|default)(?:\\s+slots)?\\s*" ")?:.*" ); if ( caseLabel.exactMatch(bottomLine) ) { /* Move a case label (or the ':' in front of a constructor initialization list) one level to the left, but only if the user did not play around with it yet. Some users have exotic tastes in the matter, and most users probably are not patient enough to wait for the final ':' to format their code properly. We don't attempt the same for goto labels, as the user is probably the middle of "foo::bar". (Who uses goto, anyway?) */ if ( indentOfLine(bottomLine) <= indent ) indent -= ppIndentSize; else indent = indentOfLine( bottomLine ); } } } delete yyProgram; terminateIndenter(); return qMax( 0, indent ); } QT_END_NAMESPACE #ifdef Q_TEST_YYINDENT /* Test driver. */ #include #include #include QT_BEGIN_NAMESPACE static QString fileContents( const QString& fileName ) { QFile f( fileName ); if ( !f.open(QFile::ReadOnly) ) { qWarning( "yyindent error: Cannot open file '%s' for reading: %s", fileName.toLatin1().data(), strerror(errno) ); return QString(); } QTextStream t( &f ); QString contents = t.read(); f.close(); if ( contents.isEmpty() ) qWarning( "yyindent error: File '%s' is empty", fileName.toLatin1().data() ); return contents; } QT_END_NAMESPACE int main( int argc, char **argv ) { QT_USE_NAMESPACE if ( argc != 2 ) { qWarning( "usage: yyindent file.cpp" ); return 1; } QString code = fileContents( argv[1] ); QStringList program = QStringList::split( '\n', code, true ); QStringList p; QString out; while ( !program.isEmpty() && program.last().trimmed().isEmpty() ) program.remove( program.fromLast() ); QStringList::ConstIterator line = program.constBegin(); while ( line != program.constEnd() ) { p.push_back( *line ); QChar typedIn = firstNonWhiteSpace( *line ); if ( p.last().endsWith(QLatin1Char(':')) ) typedIn = ':'; int indent = indentForBottomLine( p, typedIn ); if ( !(*line).trimmed().isEmpty() ) { for ( int j = 0; j < indent; j++ ) out += QLatin1Char(' '); out += (*line).trimmed(); } out += QLatin1Char('\n'); ++line; } while ( out.endsWith(QLatin1Char('\n')) ) out.truncate( out.length() - 1 ); printf( "%s\n", out.toLatin1().data() ); return 0; } #endif // Q_TEST_YYINDENT