public object visitWhileStatement(Statement.whileStmt stmt)
{
if (stmt.doWhileLoop)
{
do
{
_loop = true;
execute(stmt.body);
_continue = false;
} while (isTruthy(evaluate(stmt.condition)) && !_break);
}
else
{
while (isTruthy(evaluate(stmt.condition)) && !_break)
{
_loop = true;
execute(stmt.body);
_continue = false;
}
}
_loop = false;
_break = false;
_continue = false;
return(null);
}
private Statement forStatement()
{
consume(TokenType.LEFT_PAREN, "Expect '(' after 'for'.");
Statement 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.RIGHT_PAREN))
{
increment = expression();
}
consume(TokenType.RIGHT_PAREN, "Expect ')' after for clauses.");
parsingLoop = true;
Statement body = statement();
parsingLoop = false;
if (increment != null)
{
body = new Statement.Block(new List <Statement> {
body, new Statement.Expression(increment)
});
}
if (condition == null)
{
condition = new Expr.Literal(true, previous());
}
body = new Statement.whileStmt(condition, body, false);
if (initializer != null)
{
body = new Statement.Block(new List <Statement> {
initializer, body
});
}
return(body);
}
public object visitWhileStatement(Statement.whileStmt whileStmt)
{
bool enclosing = isInLoop;
isInLoop = true;
resolve(whileStmt.condition);
resolve(whileStmt.body);
isInLoop = enclosing;
return(null);
}