private void ScanInterpolatedStringLiteralContents(ArrayBuilder <Interpolation> interpolations)
{
while (true)
{
if (IsAtEnd())
{
// error: end of line before end of string
return;
}
switch (lexer.TextWindow.PeekChar())
{
case '"':
if (isVerbatim && lexer.TextWindow.PeekChar(1) == '"')
{
lexer.TextWindow.AdvanceChar(); // "
lexer.TextWindow.AdvanceChar(); // "
continue;
}
// found the end of the string
return;
case '}':
var pos = lexer.TextWindow.Position;
lexer.TextWindow.AdvanceChar(); // }
// ensure any } characters are doubled up
if (lexer.TextWindow.PeekChar() == '}')
{
lexer.TextWindow.AdvanceChar(); // }
}
else if (error == null)
{
error = lexer.MakeError(pos, 1, ErrorCode.ERR_UnescapedCurly, "}");
}
continue;
case '{':
if (lexer.TextWindow.PeekChar(1) == '{')
{
lexer.TextWindow.AdvanceChar();
lexer.TextWindow.AdvanceChar();
}
else
{
int openBracePosition = lexer.TextWindow.Position;
lexer.TextWindow.AdvanceChar();
int colonPosition = 0;
ScanInterpolatedStringLiteralHoleBalancedText('}', true, ref colonPosition);
int closeBracePosition = lexer.TextWindow.Position;
bool closeBraceMissing = false;
if (lexer.TextWindow.PeekChar() == '}')
{
lexer.TextWindow.AdvanceChar();
}
else
{
closeBraceMissing = true;
if (error == null)
{
error = lexer.MakeError(openBracePosition - 1, 2, ErrorCode.ERR_UnclosedExpressionHole);
}
}
interpolations?.Add(new Interpolation(openBracePosition, colonPosition, closeBracePosition, closeBraceMissing));
}
continue;
case '\\':
if (isVerbatim)
{
goto default;
}
var escapeStart = lexer.TextWindow.Position;
char c2;
char ch = lexer.ScanEscapeSequence(out c2);
if ((ch == '{' || ch == '}') && error == null)
{
error = lexer.MakeError(escapeStart, lexer.TextWindow.Position - escapeStart, ErrorCode.ERR_EscapedCurly, ch);
}
continue;
default:
// found some other character in the string portion
lexer.TextWindow.AdvanceChar();
continue;
}
}
}
private void ScanInterpolatedStringLiteralContents(ArrayBuilder <Interpolation>?interpolations)
{
while (true)
{
if (IsAtEnd())
{
// error: end of line before end of string
return;
}
switch (_lexer.TextWindow.PeekChar())
{
case '"' when RecoveringFromRunawayLexing():
// When recovering from mismatched delimiters, we consume the next
// quote character as the close quote for the interpolated string. In
// practice this gets us out of trouble in scenarios we've encountered.
// See, for example, https://github.com/dotnet/roslyn/issues/44789
return;
case '"':
if (_isVerbatim && _lexer.TextWindow.PeekChar(1) == '"')
{
_lexer.TextWindow.AdvanceChar(); // "
_lexer.TextWindow.AdvanceChar(); // "
continue;
}
// found the end of the string
return;
case '}':
var pos = _lexer.TextWindow.Position;
_lexer.TextWindow.AdvanceChar(); // }
// ensure any } characters are doubled up
if (_lexer.TextWindow.PeekChar() == '}')
{
_lexer.TextWindow.AdvanceChar(); // }
}
else
{
TrySetUnrecoverableError(_lexer.MakeError(pos, 1, ErrorCode.ERR_UnescapedCurly, "}"));
}
continue;
case '{':
if (_lexer.TextWindow.PeekChar(1) == '{')
{
_lexer.TextWindow.AdvanceChar();
_lexer.TextWindow.AdvanceChar();
}
else
{
int openBracePosition = _lexer.TextWindow.Position;
_lexer.TextWindow.AdvanceChar();
int colonPosition = 0;
ScanInterpolatedStringLiteralHoleBalancedText('}', isHole: true, ref colonPosition);
int closeBracePosition = _lexer.TextWindow.Position;
bool closeBraceMissing = false;
if (_lexer.TextWindow.PeekChar() == '}')
{
_lexer.TextWindow.AdvanceChar();
}
else
{
closeBraceMissing = true;
TrySetUnrecoverableError(_lexer.MakeError(openBracePosition - 1, 2, ErrorCode.ERR_UnclosedExpressionHole));
}
interpolations?.Add(new Interpolation(openBracePosition, colonPosition, closeBracePosition, closeBraceMissing));
}
continue;
case '\\':
if (_isVerbatim)
{
goto default;
}
var escapeStart = _lexer.TextWindow.Position;
char ch = _lexer.ScanEscapeSequence(surrogateCharacter: out _);
if (ch == '{' || ch == '}')
{
TrySetUnrecoverableError(_lexer.MakeError(escapeStart, _lexer.TextWindow.Position - escapeStart, ErrorCode.ERR_EscapedCurly, ch));
}
continue;
default:
// found some other character in the string portion
_lexer.TextWindow.AdvanceChar();
continue;
}
}
}