public object visitStmtWhileStmt(StmtWhile stmt)
{
while (isTruthy(evaluate(stmt.condition)))
{
execute(stmt.body);
}
return(null);
}
Stmt forStatement()
{
consume(TokenType.LEFT_PAREN, "Expected '(' after 'for'.");
Stmt initStmt;
if (match(TokenType.SEMICOLON))
{
initStmt = null;
}
else if (match(TokenType.VAR))
{
initStmt = varDeclaration();
}
else
{
initStmt = exprStatement();
}
Expr condition = null;
if (!check(TokenType.SEMICOLON))
{
condition = expression();
}
consume(TokenType.SEMICOLON, "Expected ';' after loop condition");
Expr increment = null;
if (!check(TokenType.RIGHT_PAREN))
{
increment = expression();
}
consume(TokenType.RIGHT_PAREN, "Expected ')' after for clauses");
Stmt body = statement();
if (increment != null)
{
body = new StmtBlock(new List <Stmt>()
{
body, new StmtExpression(increment)
});
}
if (condition == null)
{
condition = new ExprLiteral(true);
}
body = new StmtWhile(condition, body);
if (initStmt != null)
{
body = new StmtBlock(new List <Stmt>()
{
initStmt, body
});
}
return(body);
}
public object visitStmtWhileStmt(StmtWhile stmt)
{
resolve(stmt.condition);
resolve(stmt.body);
return(null);
}