public static TokenNode ParseToken(ParseContext context, IAstNode parent) {
TokenStream<RToken> tokens = context.Tokens;
TokenNode node = new TokenNode();
node.Parse(context, parent);
return node;
}
public static TokenNode ParseKeyword(ParseContext context, IAstNode parent) {
TokenStream<RToken> tokens = context.Tokens;
Debug.Assert(tokens.CurrentToken.TokenType == RTokenType.Keyword);
TokenNode keyword = new TokenNode();
keyword.Parse(context, parent);
return keyword;
}
public static TokenNode ParseOpenBraceSequence(ParseContext context, IAstNode parent) {
TokenStream<RToken> tokens = context.Tokens;
if (tokens.CurrentToken.TokenType == RTokenType.OpenBrace) {
TokenNode openBrace = new TokenNode();
openBrace.Parse(context, parent);
return openBrace;
} else {
context.AddError(new MissingItemParseError(ParseErrorType.OpenBraceExpected, tokens.PreviousToken));
}
return null;
}
/// <summary>
/// Reflects change inside string or comment by shrinking or expanding token node.
/// </summary>
/// <returns></returns>
private IAstNode OnTokenNodeChange(TokenNode node, int start, int oldLength, int newLength) {
Debug.Assert(node != null);
node.Token.Expand(0, newLength - oldLength);
return node;
}