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royqh1979@gmail.com
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b1062f24af
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@ -204,11 +204,8 @@ void CppPreprocessor::expandMacro(const QString &line, QString &newLine, QString
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}
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if (level==0) {
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argEnd = i-2;
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QString arg = line.mid(argStart,argEnd-argStart+1).trimmed();
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QString formattedValue = define->formatValue;
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for (int i=0;i<define->argList.count();i++) {
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formattedValue = formattedValue.arg(arg);
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}
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QString args = line.mid(argStart,argEnd-argStart+1).trimmed();
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QString formattedValue = expandFunction(define,args);
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newLine += expandMacros(formattedValue,depth+1);
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}
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}
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@ -354,6 +351,11 @@ bool CppPreprocessor::isMacroIdentChar(const QChar &ch)
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return (ch>='A' && ch<='Z') || (ch>='a' && ch<='z') || ch == '_';
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}
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bool CppPreprocessor::isDigit(const QChar &ch)
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{
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return (ch>='0' || ch<='9');
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}
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QString CppPreprocessor::lineBreak()
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{
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return "\n";
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@ -362,92 +364,377 @@ QString CppPreprocessor::lineBreak()
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bool CppPreprocessor::evaluateIf(const QString &line)
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{
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QString newLine = expandDefines(line); // replace FOO by numerical value of FOO
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newLine = evaluateDefines(newLine); // replace all defined() by 1 or 0
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retrun StrToIntDef(removeSuffixes(evaluateExpression(newLine)), -1) > 0;
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return removeSuffixes(evaluateExpression(newLine)), -1) > 0;
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}
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QString CppPreprocessor::expandDefines(const QString &line)
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QString CppPreprocessor::expandDefines(QString line)
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{
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int searchPos = 0;
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while (searchPos < line.length()) {
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// We have found an identifier. It is not a number suffix. Try to expand it
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if (Line[SearchPos] in MacroIdentChars) and ((SearchPos = 1) or not (Line[SearchPos - 1] in ['0'..'9'])) then begin
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Tail := SearchPos;
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Head := SearchPos;
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if (isMacroIdentChar(line[searchPos]) && (
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(searchPos == 1) || !isDigit(line[searchPos - 1]))) {
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int head = searchPos;
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int tail = searchPos;
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// Get identifier name (numbers are allowed, but not at the start
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while (Head <= Length(Line)) and ((Line[Head] in MacroIdentChars) or (Line[Head] in ['0'..'9'])) do
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Inc(Head);
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Name := Copy(Line, Tail, Head - Tail);
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NameStart := Tail;
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NameEnd := Head;
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while ((tail < line.length()) && (isMacroIdentChar(line[tail]) || isDigit(line[head])))
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tail++;
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QString name = line.mid(head,tail-head);
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int nameStart = head;
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int nameEnd = tail;
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// Skip over contents of these built-in functions
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if Name = 'defined' then begin
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Head := SearchPos + Length(Name);
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while (Head <= Length(Line)) and (Line[Head] in SpaceChars) do
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Inc(Head); // skip spaces
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if (name == "defined") {
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//expand define
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//tail = searchPos + name.length();
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while ((tail < line.length()) && isSpaceChar(line[tail]))
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tail++; // skip spaces
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int defineStart;
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int defineEnd;
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Head1:=Head;
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// Skip over its arguments
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if SkipBraces(Line, Head) then begin
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SearchPos := Head;
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end else begin
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//Skip none braced argument (next word)
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{
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Line := ''; // broken line
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if ((tail < line.length()) && (line[tail]=='(')) {
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//braced argument (next word)
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defineStart = tail+1;
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if (!skipBraces(line, tail)) {
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line = ""; // broken line
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break;
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}
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Head:=Head1;
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if (Head>Length(Line)) or not (Line[SearchPos] in MacroIdentChars) then begin
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Line := ''; // broken line
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} else {
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//none braced argument (next word)
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defineStart = tail;
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if ((tail>=line.length()) || !isMacroIdentChar(line[searchPos])) {
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line = ""; // broken line
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break;
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end;
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while (Head <= Length(Line)) and ((Line[Head] in MacroIdentChars) or (Line[Head] in ['0'..'9'])) do
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Inc(Head);
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end;
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SearchPos := Head;
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end else if (Name = 'and') or (Name = 'or') then begin
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SearchPos := Head; // Skip logical operators
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// We have found a regular define. Replace it by its value
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end else begin
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// Does it exist in the database?
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Define := GetDefine(Name,Dummy);
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if not Assigned(Define) then begin
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InsertValue := '0';
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end else begin
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while (Head <= Length(Line)) and (Line[Head] in SpaceChars) do
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Inc(Head); // skip spaces
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// It is a function. Expand arguments
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if (Head <= Length(Line)) and (Line[Head] = '(') then begin
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Tail := Head;
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if SkipBraces(Line, Head) then begin
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Args := Copy(Line, Tail, Head - Tail + 1);
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InsertValue := ExpandFunction(Define, Args);
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NameEnd := Head + 1;
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end else begin
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Line := ''; // broken line
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break;
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end;
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// Replace regular define
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end else begin
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if Define^.Value <> '' then
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InsertValue := Define^.Value
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else
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InsertValue := '0';
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end;
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end;
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}
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while ((tail < line.length()) && (isMacroIdentChar(line[tail]) || isDigit(line[tail])))
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tail++;
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}
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name = line.mid(defineStart, defineEnd - defineStart);
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int dummy;
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PDefine define = getDefine(name,dummy);
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QString insertValue;
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if (!define) {
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insertValue = "0";
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} else {
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insertValue = "1";
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}
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// Insert found value at place
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Delete(Line, NameStart, NameEnd - NameStart);
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Insert(InsertValue, Line, SearchPos);
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end;
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line.remove(searchPos, tail-searchPos+1);
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line.insert(searchPos,insertValue);
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} else if ((name == "and") || (name == "or")) {
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searchPos = tail; // Skip logical operators
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} else {
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// We have found a regular define. Replace it by its value
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// Does it exist in the database?
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int dummy;
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PDefine define = getDefine(name,dummy);
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QString insertValue;
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if (!define) {
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insertValue = "0";
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} else {
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while ((tail < line.length()) && isSpaceChar(line[tail]))
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tail++;// skip spaces
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// It is a function. Expand arguments
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if ((tail < line.length()) && (line[tail] == '(')) {
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head=tail;
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if (skipBraces(line, tail)) {
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QString args = line.mid(head,tail-head+1);
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insertValue = expandFunction(define,args);
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nameEnd = tail+1;
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} else {
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line = "";// broken line
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break;
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}
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// Replace regular define
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} else {
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if (!define->value.isEmpty())
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insertValue = define->value;
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else
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insertValue = "0";
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}
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}
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// Insert found value at place
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line.remove(nameStart, nameEnd - nameStart);
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line.insert(searchPos,insertValue);
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}
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} else {
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searchPos ++ ;
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}
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}
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return line;
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}
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bool CppPreprocessor::skipBraces(const QString &line, int &index, int step)
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{
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int level = 0;
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while ((index >= 0) && (index < line.length())) { // Find the corresponding opening brace
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if (line[index] == '(') {
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level++;
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} else if (line[index] == ')') {
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level--;
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}
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if (level == 0)
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return true;
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index+=step;
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}
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return false;
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}
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QString CppPreprocessor::expandFunction(PDefine define, QString args)
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{
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// Replace function by this string
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QString result = define->formatValue;
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if (args.startsWith('(')) {
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args.remove(0,1);
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}
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if (args.endsWith(')')) {
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args.remove(args.length()-1,1);
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}
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QStringList argValues = args.split(",");
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for (QString argValue:argValues) {
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result=result.arg(argValue);
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}
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return result;
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}
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bool CppPreprocessor::skipSpaces(const QString &expr, int &pos)
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{
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while (pos<expr.length() && isSpaceChar(expr[pos]))
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pos++;
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return pos<expr.length();
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}
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/*
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* bit_xor_expr = bit_and_expr
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| bit_xor_expr "^" bit_and_expr
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*/
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bool CppPreprocessor::evalBitXorExpr(const QString &expr, int &result, int &pos)
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{
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if (!evalBitAndExpr(expr,result,pos))
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return false;
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while (true) {
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if (!skipBraces(expr,result,pos))
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break;
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if (expr[pos]=='^') {
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pos++;
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int rightResult;
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if (!evalBitAndExpr(expr,result,pos))
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return false;
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result = result ^ rightResult;
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} else {
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break;
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}
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}
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return true;
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}
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/*
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* bit_or_expr = bit_xor_expr
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| bit_or_expr "|" bit_xor_expr
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*/
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bool CppPreprocessor::evalBitOrExpr(const QString &expr, int &result, int &pos)
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{
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if (!evalBitXorExpr(expr,result,pos))
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return false;
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while (true) {
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if (!skipBraces(expr,result,pos))
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break;
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if (expr[pos] == '|') {
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pos++;
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int rightResult;
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if (!evalBitXorExpr(expr,result,pos))
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return false;
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result = result | rightResult;
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} else {
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break;
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}
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}
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return true;
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}
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/*
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* logic_and_expr = bit_or_expr
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| logic_and_expr "&&" bit_or_expr
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*/
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bool CppPreprocessor::evalLogicAndExpr(const QString &expr, int &result, int &pos)
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{
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if (!evalBitOrExpr(expr,result,pos))
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return false;
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while (true) {
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if (!skipBraces(expr,result,pos))
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break;
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if (pos+1<expr.length() && expr[pos]=='&' && expr[pos+1] =='&') {
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pos+=2;
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int rightResult;
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if (!evalBitOrExpr(expr,rightResult,pos))
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return false;
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result = result && rightResult;
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} else {
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break;
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}
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}
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return true;
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}
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/*
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* logic_or_expr = logic_and_expr
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| logic_or_expr "||" logic_and_expr
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*/
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bool CppPreprocessor::evalLogicOrExpr(const QString &expr, int &result, int &pos)
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{
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if (!evalLogicAndExpr(expr,result,pos))
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return false;
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while (true) {
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if (!skipBraces(expr,result,pos))
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break;
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if (pos+1<expr.length() && expr[pos]=='|' && expr[pos+1] =='|') {
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pos+=2;
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int rightResult;
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if (!evalLogicAndExpr(expr,rightResult,pos))
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return false;
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result = result || rightResult;
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} else {
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break;
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}
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}
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return true;
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}
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bool CppPreprocessor::evalExpr(const QString &expr, int &result, int &pos)
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{
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return evalLogicOrExpr(expr,result,pos);
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}
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/* BNF for C constant expression evaluation
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* term = number
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| '(' expression ')'
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unary_expr = term
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| '+' term
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| '-' term
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| '!' term
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| '~' term
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mul_expr = term
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| mul_expr '*' term
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| mul_expr '/' term
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| mul_expr '%' term
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add_expr = mul_expr
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| add_expr '+' mul_expr
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| add_expr '-' mul_expr
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shift_expr = add_expr
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| shift_expr "<<" add_expr
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| shift_expr ">>" add_expr
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relation_expr = shift_expr
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| relation_expr ">=" shift_expr
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| relation_expr ">" shift_expr
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| relation_expr "<=" shift_expr
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| relation_expr "<" shift_expr
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equal_expr = relation_expr
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| equal_expr "==" relation_expr
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| equal_expr "!=" relation_expr
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bit_and_expr = equal_expr
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| bit_and_expr "&" equal_expr
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bit_xor_expr = bit_and_expr
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| bit_xor_expr "^" bit_and_expr
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bit_or_expr = bit_xor_expr
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| bit_or_expr "|" bit_xor_expr
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logic_and_expr = bit_or_expr
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| logic_and_expr "&&" bit_or_expr
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logic_or_expr = logic_and_expr
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| logic_or_expr "||" logic_and_expr
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*/
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QString CppPreprocessor::evaluateExpression(QString line)
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{
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//todo: improve this
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// Find the first closing brace (this should leave us at the innermost brace pair)
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while (true) {
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int head = line.indexOf(')');
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if (head<0)
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break;
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int tail = head;
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if (skipBraces(line, tail, -1)) { // find the corresponding opening brace
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QString resultLine = evaluateExpression(line.mid(tail + 1, head - tail - 1)); // evaluate this (without braces)
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line.remove(tail, head - tail + 1); // Remove the old part AND braces
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line.insert(tail,resultLine); // and replace by result
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} else {
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return "";
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}
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}
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// Then evaluate braceless part
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while (true) {
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int operatorPos;
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QString operatorToken = getNextOperator(operatorPos);
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if (operatorPos < 0)
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break;
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// Get left operand
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int tail = operatorPos - 1;
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while ((tail >= 0) && isSpaceChar(line[tail]))
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tail--; // skip spaces
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Head := Tail;
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while (Head >= 0) and (Line[Head] in IdentChars) do
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Dec(Head); // step over identifier
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LeftOp := Copy(Line, Head + 1, Tail - Head);
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EquatStart := Head + 1; // marks begin of equation
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// Get right operand
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Tail := OperatorPos + Length(OperatorToken) + 1;
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while (Tail <= Length(Line)) and (Line[Tail] in SpaceChars) do
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Inc(Tail); // skip spaces
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Head := Tail;
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while (Head <= Length(Line)) and (Line[Head] in IdentChars) do
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Inc(Head); // step over identifier
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RightOp := Copy(Line, Tail, Head - Tail);
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EquatEnd := Head; // marks begin of equation
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// Evaluate after removing length suffixes...
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LeftOpValue := StrToIntDef(RemoveSuffixes(LeftOp), 0);
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RightOpValue := StrToIntDef(RemoveSuffixes(RightOp), 0);
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if OperatorToken = '*' then
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ResultValue := LeftOpValue * RightOpValue
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else if OperatorToken = '/' then begin
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if RightOpValue = 0 then
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ResultValue := LeftOpValue
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else
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ResultValue := LeftOpValue div RightOpValue; // int division
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end else if OperatorToken = '+' then
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ResultValue := LeftOpValue + RightOpValue
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else if OperatorToken = '-' then
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ResultValue := LeftOpValue - RightOpValue
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else if OperatorToken = '<' then
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ResultValue := integer(LeftOpValue < RightOpValue)
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else if OperatorToken = '<=' then
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ResultValue := integer(LeftOpValue <= RightOpValue)
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else if OperatorToken = '>' then
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ResultValue := integer(LeftOpValue > RightOpValue)
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else if OperatorToken = '>=' then
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ResultValue := integer(LeftOpValue >= RightOpValue)
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else if OperatorToken = '==' then
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ResultValue := integer(LeftOpValue = RightOpValue)
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else if OperatorToken = '!=' then
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ResultValue := integer(LeftOpValue <> RightOpValue)
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else if OperatorToken = '&' then // bitwise and
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ResultValue := integer(LeftOpValue and RightOpValue)
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else if OperatorToken = '|' then // bitwise or
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ResultValue := integer(LeftOpValue or RightOpValue)
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else if OperatorToken = '^' then // bitwise xor
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ResultValue := integer(LeftOpValue xor RightOpValue)
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else if (OperatorToken = '&&') or (OperatorToken = 'and') then
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ResultValue := integer(LeftOpValue and RightOpValue)
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else if (OperatorToken = '||') or (OperatorToken = 'or') then
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ResultValue := integer(LeftOpValue or RightOpValue)
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else
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ResultValue := 0;
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// And replace by result in string form
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Delete(Line, EquatStart, EquatEnd - EquatStart);
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Insert(IntToStr(ResultValue), Line, EquatStart);
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end else
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Inc(SearchPos);
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break;
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end;
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Result := Line;
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}
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@ -94,10 +94,33 @@ private:
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*/
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bool isMacroIdentChar(const QChar& ch);
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/*
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* '0'..'9'
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*/
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bool isDigit(const QChar& ch);
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QString lineBreak();
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bool evaluateIf(const QString& line);
|
||||
QString expandDefines(const QString& line);
|
||||
QString expandDefines(QString line);
|
||||
bool skipBraces(const QString&line, int& index, int step = 1);
|
||||
QString expandFunction(PDefine define,QString args);
|
||||
bool skipSpaces(const QString &expr, int& pos);
|
||||
bool evalTerm(const QString &expr, int& result, int& pos);
|
||||
bool evalUnaryExpr(const QString &expr, int& result, int& pos);
|
||||
bool evalMulExpr(const QString &expr, int& result, int& pos);
|
||||
bool evalAddExpr(const QString &expr, int& result, int& pos);
|
||||
bool evalShiftExpr(const QString &expr, int& result, int& pos);
|
||||
bool evalRelationExpr(const QString &expr, int& result, int& pos);
|
||||
bool evalEqualExpr(const QString &expr, int& result, int& pos);
|
||||
bool evalBitAndExpr(const QString &expr, int& result, int& pos);
|
||||
bool evalBitXorExpr(const QString &expr, int& result, int& pos);
|
||||
bool evalBitOrExpr(const QString &expr, int& result, int& pos);
|
||||
bool evalLogicAndExpr(const QString &expr, int& result, int& pos);
|
||||
bool evalLogicOrExpr(const QString &expr, int& result, int& pos);
|
||||
bool evalExpr(const QString &expr, int& result, int& pos);
|
||||
|
||||
QString evaluateExpression(QString line);
|
||||
private:
|
||||
int mIndex; // points to current file buffer. do not free
|
||||
QString mFileName; // idem
|
||||
|
|
|
|||
Loading…
Reference in New Issue