/// <summary>
/// Create a <see cref="SyntaxToken"/> from one or more <see cref="LexicalToken"/>.
/// </summary>
private static SyntaxToken ProduceSyntaxToken(Source <LexicalToken> source, int start, int length, string text)
{
if (length == 1)
{
return(SyntaxToken.From(source.Peek(start)));
}
else
{
// use the trivia form the first token and the text supplied (instead of concatenating the same text from the tokens)
return(SyntaxToken.Identifier(source.Peek(start).Trivia, text));
}
}
/// <summary>
/// Matches one or more lexical tokens to the corresponding text.
/// </summary>
private static int MatchesText(Source <LexicalToken> source, int start, string text)
{
// consume all lexical tokens with combined text that matches the specified text
int textOffset = 0;
int i = 0;
for (; !source.IsEnd(start + i); i++)
{
var token = source.Peek(start + i);
// only first token can have trivia
if (i > 0 && token.Trivia.Length > 0)
{
break;
}
// token has more text than remaining
if (token.Text.Length > text.Length - textOffset)
{
break;
}
// text parts must match exactly
if (string.Compare(token.Text, 0, text, textOffset, token.Text.Length) != 0)
{
break;
}
textOffset += token.Text.Length;
if (textOffset == text.Length)
{
return(i + 1);
}
}
return(-(i + 1));
}