private Token ReadNumber(CodeReader reader)
{
string number = "";
int tokenLine = reader.Line;
int tokenColumn = reader.Column;
while (reader.CheckCurrent(char.IsDigit))
{
number += reader.Consume();
}
if (reader.TryMatch('.'))
{
number += '.';
while (reader.CheckCurrent(char.IsDigit))
{
number += reader.Consume();
}
}
double result;
if (!double.TryParse(number, out result))
{
OnError("Invalid number", tokenLine, tokenColumn);
}
return(new Token(number, TokenKind.Number, tokenLine, tokenColumn));
}
/// <summary>
/// Matches an expected character with current character of the reader. If doesnt match an error will be reported.
/// </summary>
private void Match(CodeReader reader, char c)
{
if (!reader.TryMatch(c))
{
OnError("Expected character " + c, reader.Line, reader.Column);
}
}
private Token ReadTextLiteral(CodeReader reader)
{
Match(reader, '\"');
string text = "";
int tokenLine = reader.Line;
int tokenColumn = reader.Column;
while (!reader.EndOfFile && !reader.EndOfLine)
{
if (reader.TryMatch('\"'))
{
return(new Token(text, TokenKind.Text, tokenLine, tokenColumn));
}
text += reader.Consume();
}
OnError("Invalid text literal ending", tokenLine, tokenColumn + text.Length);
return(new Token(text, TokenKind.Text, tokenLine, tokenColumn));
}