public Void Visit_WhileStmt(WhileStmt stmt)
{
Resolve(stmt.condition);
Resolve(stmt.body);
return(null);
}
private Stmt ForStatement()
{
Expect(TokenType.LeftParen, ErrorType.ExpectedOpenParen);
Stmt initializer;
if (CheckCurrentToken(TokenType.Semicolon))
{
initializer = null;
Advance();
}
else if (CheckCurrentToken(TokenType.Var))
{
Advance();
initializer = VarDeclaration();
}
else
{
initializer = ExpressionStatement();
}
Expr condition = null;
if (!CheckCurrentToken(TokenType.Semicolon))
{
condition = Expression();
}
Expect(TokenType.Semicolon, ErrorType.ExpectedSemicolon);
Expr increment = null;
if (!CheckCurrentToken(TokenType.RightParen))
{
increment = Expression();
}
Expect(TokenType.RightParen, ErrorType.ExpectedClosedParen);
Stmt body = Statement();
if (increment != null)
{
body = new BlockStmt(new List <Stmt> {
body, new ExpressionStmt(increment)
});
}
if (condition == null)
{
condition = new LiteralExpr(true);
}
body = new WhileStmt(condition, body);
if (initializer != null)
{
body = new BlockStmt(new List <Stmt> {
initializer, body
});
}
return(body);
}
public string Visit_WhileStmt(WhileStmt stmt)
{
return(Parenthesize("While", new ExpressionStmt(stmt.condition), stmt.body));
}