private Stmt ForStatement()
{
Consume(LEFT_PAREN, "Expect '(' after 'for'.");
Stmt initializer;
if (Match(SEMICOLON))
{
initializer = null;
}
else if (Match(VAR))
{
initializer = VarDeclaration();
}
else
{
initializer = ExpressionStatement();
}
Expr condition = null;
if (!Check(SEMICOLON))
{
condition = Expression();
}
Consume(SEMICOLON, "Expect ';' after loop condition.");
Expr increment = null;
if (!Check(RIGHT_PAREN))
{
increment = Expression();
}
Consume(RIGHT_PAREN, "Expect ')' after for clauses.");
var body = Statement();
if (increment != null)
{
body = new Stmt.BlockStmt(new List <Stmt> {
body, new Stmt.ExpressionStmt(increment)
});
}
condition ??= new Expr.LiteralExpr(true);
body = new Stmt.WhileStmt(condition, body);
if (initializer != null)
{
body = new Stmt.BlockStmt(new List <Stmt> {
initializer, body
});
}
return(body);
}
public string VisitWhileStmt(Stmt.WhileStmt stmt)
{
return(Parenthesize2("while", stmt.Condition, stmt.Body));
}
public object VisitWhileStmt(Stmt.WhileStmt stmt)
{
Resolve(stmt.Condition);
Resolve(stmt.Body);
return(null);
}