private string TrimComments(string line) {
if(line == null) {
if(state != CommentTrimmerState.Normal) {
throw new PreprocessingException("unterminated block comment");
}
return line;
}
StringBuilder output = new StringBuilder(line.Length);
for (int i = 0; i <= line.Length; ++i) {
char c = i < line.Length ? line[i] : '\0';
// Console.WriteLine("'{0}' {1} <{2}>", c, state, output);
switch(state) {
case CommentTrimmerState.Normal:
if (c == '/') {
state = CommentTrimmerState.AfterSlash;
} else if (c == '"') {
state = CommentTrimmerState.InStringLiteral;
output.Append(c);
} else if (c == '\0') {
// nothing
} else {
output.Append(c);
}
break;
case CommentTrimmerState.InStringLiteral:
if (c == '"') {
state = CommentTrimmerState.Normal;
output.Append(c);
} else if (c == '\0') {
state = CommentTrimmerState.Normal;
// btw, this means unterminated string literal
} else {
output.Append(c);
}
break;
case CommentTrimmerState.AfterSlash:
if (c == '/') {
state = CommentTrimmerState.InLineComment;
} else if (c == '*') {
state = CommentTrimmerState.InBlockComment;
} else if (c == '\0') {
output.Append('/');
state = CommentTrimmerState.Normal;
} else {
output.Append('/');
output.Append(c);
state = CommentTrimmerState.Normal;
}
break;
case CommentTrimmerState.InBlockComment:
if (c == '*') {
state = CommentTrimmerState.AfterStar;
}
break;
case CommentTrimmerState.AfterStar:
if (c == '/') {
state = CommentTrimmerState.Normal;
} else if (c == '*') {
state = CommentTrimmerState.AfterStar;
} else {
state = CommentTrimmerState.InBlockComment;
}
break;
case CommentTrimmerState.InLineComment:
if (c == '\0') {
state = CommentTrimmerState.Normal;
}
break;
}
}
return output.ToString().Trim();
}
private string TrimComments(string line)
{
if (line == null)
{
if (state != CommentTrimmerState.Normal)
{
throw new PreprocessingException("unterminated block comment");
}
return(line);
}
StringBuilder output = new StringBuilder(line.Length);
for (int i = 0; i <= line.Length; ++i)
{
char c = i < line.Length ? line[i] : '\0';
// Console.WriteLine("'{0}' {1} <{2}>", c, state, output);
switch (state)
{
case CommentTrimmerState.Normal:
if (c == '/')
{
state = CommentTrimmerState.AfterSlash;
}
else if (c == '"')
{
state = CommentTrimmerState.InStringLiteral;
output.Append(c);
}
else if (c == '\0')
{
// nothing
}
else
{
output.Append(c);
}
break;
case CommentTrimmerState.InStringLiteral:
if (c == '"')
{
state = CommentTrimmerState.Normal;
output.Append(c);
}
else if (c == '\0')
{
state = CommentTrimmerState.Normal;
// btw, this means unterminated string literal
}
else
{
output.Append(c);
}
break;
case CommentTrimmerState.AfterSlash:
if (c == '/')
{
state = CommentTrimmerState.InLineComment;
}
else if (c == '*')
{
state = CommentTrimmerState.InBlockComment;
}
else if (c == '\0')
{
output.Append('/');
state = CommentTrimmerState.Normal;
}
else
{
output.Append('/');
output.Append(c);
state = CommentTrimmerState.Normal;
}
break;
case CommentTrimmerState.InBlockComment:
if (c == '*')
{
state = CommentTrimmerState.AfterStar;
}
break;
case CommentTrimmerState.AfterStar:
if (c == '/')
{
state = CommentTrimmerState.Normal;
}
else
{
state = CommentTrimmerState.InBlockComment;
}
break;
case CommentTrimmerState.InLineComment:
if (c == '\0')
{
state = CommentTrimmerState.Normal;
}
break;
}
}
return(output.ToString().Trim());
}
