WhileStmtAst While()
{
Token keywrd = Match(TokenKind.WhileKeyword);
Match(TokenKind.LeftParen);
ExprAst cond = Expr();
Match(TokenKind.RightParen);
StmtAst then = Stmt();
return(new WhileStmtAst(keywrd, cond, then));
}
ForStmtAst For()
{
Token keywrd = Match(TokenKind.ForKeyword);
Match(TokenKind.LeftParen);
StmtAst init = Stmt();
ExprAst cond = Expr();
Match(TokenKind.Semicol);
ExprAst step = Expr();
Match(TokenKind.RightParen);
StmtAst then = Stmt();
return(new ForStmtAst(keywrd, init, cond, step, then));
}
IfStmtAst If()
{
Token keywrd = Match(TokenKind.IfKeyword);
Match(TokenKind.LeftParen);
ExprAst cond = Expr();
Match(TokenKind.RightParen);
StmtAst then = Stmt();
StmtAst?elze = null;
if (current.kind is TokenKind.ElseKeyword)
{
Next();
elze = Stmt();
}
return(new IfStmtAst(keywrd, cond, then, elze));
}
