AsmLine ParseWordDirective(Token head)
{
var result = new WordDirective();
do
{
result.Elements.Add(ParseExpr());
} while (TryMatchComma());
MatchEndOfDirective();
return(result);
}
AsmLine TryParseDirective(Token head)
{
if (head.Type == TokenType.Symbol)
{
if (toks.PeekToken().Type == TokenType.Equals)
{
toks.NextToken();
var expr = ParseExpr();
MaybeSkipTypeFlag();
MatchEndOfDirective();
return(new EqualsDirective(head.Text, expr));
}
if (directiveDict.TryGetValue(head.Text, out var handler))
{
return(handler(head));
}
}
if (CanStartExpr(head.Type))
{
switch (toks.PeekToken().Type)
{
case TokenType.EndOfFile:
case TokenType.EndOfLine:
case TokenType.Comma:
case TokenType.Plus:
// data directive (.WORD keyword is optional)
break;
default:
return(ParseUnrecognizedInstruction(head));
}
var result = new WordDirective();
result.Elements.Add(ParseExpr(head));
while (TryMatchComma())
{
result.Elements.Add(ParseExpr());
}
MatchEndOfDirective();
return(result);
}
return(null);
}
