private Stmt forStatement()
{
consume(TokenType.LEFT_PAREN, "Expect '(' after 'for'");
Stmt initializer;
if (match(TokenType.SEMICOLON))
{
initializer = null;
}
else if (match(TokenType.VAR))
{
initializer = varDeclaration();
}
else
{
initializer = expressionStatement();
}
Expr cond = null;
if (!check(TokenType.SEMICOLON))
{
cond = expression();
}
consume(TokenType.SEMICOLON, "Expect ';' after loop condition");
Expr increment = null;
if (!check(TokenType.RIGHT_PAREN))
{
increment = expression();
}
consume(TokenType.RIGHT_PAREN, "Expect ')' after for clauses");
Stmt body = statement();
if (increment != null)
{
body = new Stmt.Block(
new List <Stmt> {
body,
new Stmt.Expression(increment)
}
);
}
if (cond != null)
{
cond = new Expr.Literal(true);
}
body = new Stmt.While(cond, body);
if (initializer != null)
{
body = new Stmt.Block(new List <Stmt> {
initializer, body
});
}
return(body);
}
public object visitBlockStmt(Stmt.Block stmt)
{
beginScope();
resolve(stmt.Statements);
endScope();
return(null);
}
public object visitBlockStmt(Stmt.Block stmt)
{
executeBlock(stmt.Statements, new Envir(env));
return(null);
}