private bool IsPrefixToken(Token t)
{
return
t.Kind == TokenKind.Increment ||
t.Kind == TokenKind.Decrement ||
t.Kind == TokenKind.Subtract ||
t.Kind == TokenKind.Add ||
t.Kind == TokenKind.LogicalNot ||
t.Kind == TokenKind.KeywordAwait;
}
private bool IsRelationalToken(Token t)
{
return
t.Kind == TokenKind.LessThan ||
t.Kind == TokenKind.LessThanOrEqual ||
t.Kind == TokenKind.GreaterThan ||
t.Kind == TokenKind.GreaterThanOrEqual;
}
private bool IsMultiplicativeToken(Token t)
{
return
t.Kind == TokenKind.Multiply ||
t.Kind == TokenKind.Divide ||
t.Kind == TokenKind.Mod;
}
private bool IsPostfixToken(Token t)
{
return
t.Kind == TokenKind.Increment ||
t.Kind == TokenKind.Decrement;
}
private bool IsAssignToken(Token token)
{
switch (token.Kind)
{
case TokenKind.AddEqual:
case TokenKind.SubtractEqual:
case TokenKind.PowerEqual:
case TokenKind.MultiplyEqual:
case TokenKind.DivideEqual:
case TokenKind.ModEqual:
case TokenKind.LeftShiftEqual:
case TokenKind.RightShiftEqual:
case TokenKind.BitwiseAndEqual:
case TokenKind.BitwiseOrEqual:
case TokenKind.ExclusiveOrEqual:
case TokenKind.Assign:
return true;
default:
return false;
}
}
private bool IsEqualityToken(Token t)
{
return t.Kind == TokenKind.Equals || t.Kind == TokenKind.NotEquals;
}
private bool IsAdditiveToken(Token t)
{
return
t.Kind == TokenKind.Add ||
t.Kind == TokenKind.Subtract;
}
private static string GetErrorMessage(Token t, int errorCode)
{
string msg;
if (t.Kind != TokenKind.EndOfFile)
{
msg = Resources.UnexpectedToken;
}
else
{
msg = "unexpected EOF while parsing";
}
return msg;
}
private void ReportSyntaxError(Token t, IndexSpan span, int errorCode, bool allowIncomplete)
{
var start = span.Start;
var end = span.End;
if (allowIncomplete && (t.Kind == TokenKind.EndOfFile || (_tokenizer.IsEndOfFile && t.Kind == TokenKind.NLToken)))
{
errorCode |= ErrorCodes.IncompleteStatement;
}
string msg = String.Format(System.Globalization.CultureInfo.InvariantCulture, GetErrorMessage(t, errorCode), t.Image);
ReportSyntaxError(start, end, msg, errorCode);
}
private bool PeekToken(Token check)
{
return PeekToken() == check;
}
public TokenWithSpan(Token token, IndexSpan span)
{
this.token = token;
this.span = span;
}