import { ASTNode } from "./index";
import symbol_tree from './index';
import { Expression, ValueNode, AttributionNode, FunctionCallNode } from './index';

var variable_id = 0;

let results: string[] = [];
function nextVar ()
{
    return 'var' + variable_id++;
}
 
 
function writeThreeAddressCode (node)
{
    if (node.id === 'StatementsNode')
    {
        for (var statement of node.statements)
        {
            writeThreeAddressCode(statement);
        }
    }
    else
    if (node instanceof FunctionCallNode)
    {
        /**TODO:
         * generate the three address code for each parameter of the node.parameters array
         * write on the screen the three address code for each parameter
         * node.result will be nextVar()
         * write on the screen the three address code for function call
         */
    }
    else
    if (node instanceof ValueNode)
    {
        // the result for a number is the number itself
        node.result = node.value;
    }
    else
    if (node instanceof AttributionNode)
    {
        /** TODO: 
         * generate the three address code for node.value
         * write on the screen the three address code for an attribution*/
    }
    else
    if (node instanceof Expression)
    {
        if (node.left !== undefined && node.right !== undefined)
        {
            writeThreeAddressCode (node.left);
            writeThreeAddressCode (node.right);

            // node.left.result is the result of node.left
            // node.right.result is the result of node.right
            
            /** TODO: 
             * node.result will be nextVar()
             * write on the screen the three address code based on result, left result, right result and operator*/
        }
    }
}
 
var ast = parser.parse (str);
console.log (JSON.stringify(ast, null, 4));

writeThreeAddressCode(ast);