public static IfBlock Parse(TokenList _tokens)
{
IfBlock ret = null;
Symbol op = 0;
if (_tokens.PeekToken().TokenName == Lexer.Tokens.LeftParan)
{
_tokens.Pos++;
}
Expr lexpr = Expr.Parse(_tokens);
if (_tokens.PeekToken().TokenName == Lexer.Tokens.DoubleEqual)
{
op = Symbol.doubleEqual;
_tokens.Pos++;
}
else if (_tokens.PeekToken().TokenName == Lexer.Tokens.NotEqual)
{
op = Symbol.notEqual;
_tokens.Pos++;
}
Expr rexpr = Expr.Parse(_tokens);
if (_tokens.PeekToken().TokenName == Lexer.Tokens.RightParan)
{
_tokens.Pos++;
}
ret = new IfBlock(lexpr, op, rexpr);
return(ret);
}
private void CompileIf(IfBlock data)
{
CompileExpr(data.LeftExpr);
CompileExpr(data.RightExpr);
if (data.Op == Symbol.doubleEqual)
{
Write("ife");
}
else if (data.Op == Symbol.notEqual)
{
Write("ifn");
}
CompileStmtList(data.Statements);
}