private void ScanCharacter(LineProgress p, bool skipOnly = false)
{
while (!p.EndOfLine)
{
if (p.Char() == '\\') // escaped character. Skip over it.
{
p.Advance(2);
}
else if (p.Char() == '\'') // end of char
{
p.Advance();
if (!skipOnly)
{
p.State = State.Default;
}
return;
}
else
{
p.Advance();
}
}
if (!skipOnly)
{
// End of line. Char wasn't closed. Oh well. Revert to Default state.
p.State = State.Default;
}
}
private void ScanInterpolation(LineProgress p, bool skipOnly)
{
while (!p.EndOfLine)
{
if (p.Char() == '$' && p.NextChar() == '@' && p.NextNextChar() == '"') // interpolated multiline string
{
p.Advance(3);
ScanMultiLineString(p, true, true);
}
else if (p.Char() == '$' && p.NextChar() == '"') // interpolated string
{
p.Advance(2);
ScanString(p, true, true);
}
else
if (p.Char() == '@' && p.NextChar() == '"') // multi-line string
{
p.Advance(2);
ScanMultiLineString(p, false, true);
}
else if (p.Char() == '"') // single-line string
{
p.Advance();
ScanString(p, false, true);
}
else if (p.Char() == '\'') // character
{
p.Advance();
ScanCharacter(p, true);
}
else if (p.Char() == '/' && p.NextChar() == '*') // multiline comment
{
p.Advance();
ScanMultiLineComment(p, true); // note we do not support multiline comments spanning muliple lines.
}
else if (p.Char() == '}') // end of interpolation.
{
p.Advance();
if (!skipOnly)
{
p.EndStringInterpolation();
}
return;
}
else
{
p.Advance();
}
}
if (!skipOnly)
{
// end of line: note that we do not support interpolations spanning muliple lines.
p.EndStringInterpolation();
}
}
private void ScanMultiLineComment(LineProgress p, bool skipOnly = false)
{
while (!p.EndOfLine)
{
if (p.Char() == '*' && p.NextChar() == '/')
{
p.Advance(2);
if (!skipOnly)
{
p.State = State.Default;
}
return;
}
else
{
p.Advance();
}
}
}
private void ScanMultiLineString(LineProgress p, bool isInterpolated, bool skipOnly = false)
{
while (!p.EndOfLine)
{
if (p.Char() == '"' && p.NextChar() == '"') // "" is allowed within multiline string
{
p.Advance(2);
}
else if (isInterpolated && p.Char() == '{' && p.NextChar() == '{') // escaped interpolation
{
p.Advance(2);
}
else if (isInterpolated && p.Char() == '{' && p.NextChar() != '{') // interpolation.
{
if (!skipOnly)
{
p.StartStringInterpolation();
}
p.Advance();
ScanInterpolation(p, skipOnly);
}
else if (p.Char() == '"') // end of multi-line string
{
if (!skipOnly)
{
p.EndString();
}
p.Advance();
return;
}
else
{
p.Advance();
}
}
if (!skipOnly)
{
// End of line. Emit as string, but remain in MultiLineString state
p.EndString(p.State);
}
}
private void ScanString(LineProgress p, bool isInterpolated, bool skipOnly = false)
{
while (!p.EndOfLine)
{
if (p.Char() == '\\') // escaped character. Skip over it.
{
p.Advance(2);
}
else if (isInterpolated && p.Char() == '{' && p.NextChar() == '{') // escaped interpolation
{
p.Advance(2);
}
else if (isInterpolated && p.Char() == '{' && p.NextChar() != '{') // interpolation.
{
if (!skipOnly)
{
p.StartStringInterpolation();
}
p.Advance();
ScanInterpolation(p, skipOnly);
}
else if (p.Char() == '"') // end of string.
{
if (!skipOnly)
{
p.EndString();
}
p.Advance();
return;
}
else
{
p.Advance();
}
}
// End of line. String wasn't closed. Oh well. Revert to Default state.
if (!skipOnly)
{
p.EndString();
}
}
private void ScanDefault(LineProgress p)
{
while (!p.EndOfLine)
{
if (p.Char() == '$' && p.NextChar() == '@' && p.NextNextChar() == '"') // interpolated multiline string
{
p.Advance(3);
p.StartString(State.InterpolatedMultiLineString);
ScanMultiLineString(p, true);
}
else if (p.Char() == '$' && p.NextChar() == '"') // interpolated string
{
p.Advance(2);
p.StartString(State.InterpolatedString);
ScanString(p, true);
}
else
if (p.Char() == '@' && p.NextChar() == '"') // multi-line string
{
p.Advance(2);
p.StartString(State.MultiLineString);
ScanMultiLineString(p, false);
}
else if (p.Char() == '"') // single-line string
{
p.Advance();
p.StartString(State.String);
ScanString(p, false);
}
else if (p.Char() == '\'') // character
{
p.Advance();
ScanCharacter(p);
}
else if (p.Char() == '/' && p.NextChar() == '*') // multiline comment
{
p.Advance(2);
p.State = State.MultilineComment;
ScanMultiLineComment(p);
}
else if (p.Char() == '/' && p.NextChar() == '/') // single-line comment
{
p.AdvanceToEndOfLine();
}
else
{
p.Advance();
}
}
}