private Stmt ForStatement()
{
Consume(TokenType.LeftParen, "Expect '(' after 'for'.");
Stmt initializer;
if (Match(TokenType.Semicolon))
{
initializer = null;
}
else if (Match(TokenType.Var))
{
initializer = VarDeclaration();
}
else
{
initializer = ExpressionStatement();
}
Expr condition = null;
if (!Check(TokenType.Semicolon))
{
condition = Expression();
}
Consume(TokenType.Semicolon, "Expect ';' after loop condition.");
Expr increment = null;
if (!Check(TokenType.RightParen))
{
increment = Expression();
}
Consume(TokenType.RightParen, "Expect ')' after for clauses.");
var 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 void VisitBlockStmt(BlockStmt stmt)
{
BeginScope();
Resolve(stmt.Statements);
EndScope();
}
public void VisitBlockStmt(BlockStmt stmt)
{
ExecuteBlock(stmt.Statements, new Environment(environment));
}