SrcFile PreProcess(Stream& in, Parser& parser) // This is not really C preprocess, only removes (or processes) comment and directives
{
SrcFile res;
bool include = true;
int lineno = 0;
while(!in.IsEof()) {
String ln = in.GetLine();
lineno++;
SLPos(res);
while(*ln.Last() == '\\') {
ln.Trim(ln.GetLength() - 1);
ln.Cat(in.GetLine());
SLPos(res);
}
const char *rm = ln;
if(IsAlNum(*rm)) {
const char *s = ln;
bool islbl = false;
bool wassemi = false;
while(*s && iscid(*s) || findarg(*s, '\t', ' ', ':') >= 0) { // check for label, labeled lines are not grounded
if(*s == ':' && !wassemi) {
islbl = true;
wassemi = true; // second ':' cancels label
}
else
if(*s != '\t' && *s != ' ')
islbl = false; // something was after the label, e.g. void Foo::Bar()
s++;
}
if(!islbl)
res.text << '\2';
}
else
if(*rm == '\x1f') // line started with macro
res.text << '\2';
while(*rm == ' ' || *rm == '\t') rm++;
if(*rm == '\0')
res.blankLinesRemoved++;
else
if(*rm == '#')
{
const char *s = rm + 1;
while(*s == ' ' || *s == '\t')
s++;
if(s[0] == 'd' && s[1] == 'e' && s[2] == 'f' &&
s[3] == 'i' && s[4] == 'n' && s[5] == 'e' && !iscid(s[6])) {
s += 6;
while(*s == ' ' || *s == '\t') s++;
String macro;
while(iscid(*s))
macro.Cat(*s++);
if(*s == '(') {
while(*s != ')' && *s)
macro.Cat(*s++);
macro << ')';
}
if(include)
parser.AddMacro(lineno, macro);
}
res.preprocessorLinesRemoved++;
}
else {
bool lineContainsComment = false;
bool lineContainsNonComment = false;
String cmd;
while(*rm) {
if(*rm == '\"') {
lineContainsNonComment = true;
res.text << '\"';
rm++;
while((byte)*rm && *rm != '\r' && *rm != '\n') {
if(*rm == '\"') {
res.text << '\"';
rm++;
break;
}
if(*rm == '\\' && rm[1]) {
if(include)
res.text.Cat(*rm);
rm++;
}
if(include)
res.text.Cat(*rm);
rm++;
}
}
else
if(*rm == '\\' && rm[1]) {
lineContainsNonComment = true;
if(include) {
res.text.Cat(*rm++);
res.text.Cat(*rm++);
}
else
rm += 2;
}
else
if(rm[0] == '/' && rm[1] == '/') {
cmd = rm + 2;
if(!lineContainsNonComment)
res.commentLinesRemoved++;
break;
}
else
if(rm[0] == '/' && rm[1] == '*') {
lineContainsComment = true;
rm += 2;
for(;;) {
if(*rm == '\0') {
if(!lineContainsNonComment)
res.commentLinesRemoved++;
if(in.IsEof()) break;
SLPos(res);
ln = in.GetLine();
rm = ~ln;
lineContainsNonComment = false;
}
if(rm[0] == '*' && rm[1] == '/') {
rm += 2;
break;
}
rm++;
}
if(include)
res.text.Cat(' ');
}
else {
lineContainsNonComment = true;
if(include)
res.text.Cat(*rm);
rm++;
}
}
if(include)
res.text << ' ';
if(cmd[0] == '$') {
if(cmd[1] == '-') include = false;
if(cmd[1] == '+') include = true;
if(cmd[1]) {
res.text.Cat(~cmd + 2);
res.text.Cat(' ');
}
}
if(lineContainsComment && !lineContainsNonComment)
res.commentLinesRemoved++;
}
}
return pick(res);
}
