jintr/dist/nodes/BinaryExpression.js

A tiny JavaScript interpreter written in TypeScript.

import BaseJSNode from './BaseJSNode.js';
export default class BinaryExpression extends BaseJSNode {
    run() {
        const { operator, left, right } = this.node;
        // Pre-evaluate both nodes.
        const leftValue = this.visitor.visitNode(left);
        const rightValue = this.visitor.visitNode(right);
        const operation = BinaryExpression.operatorMap[operator];
        if (!operation) {
            console.warn('Unhandled binary operator:', operator);
            return undefined;
        }
        return operation(leftValue, rightValue);
    }
}
BinaryExpression.operatorMap = {
    // Comparison operators
    '!=': (left, right) => left != right,
    '!==': (left, right) => left !== right,
    '==': (left, right) => left == right,
    '===': (left, right) => left === right,
    '<': (left, right) => left < right,
    '<=': (left, right) => left <= right,
    '>': (left, right) => left > right,
    '>=': (left, right) => left >= right,
    // Arithmetic operators
    '+': (left, right) => left + right,
    '-': (left, right) => left - right,
    '*': (left, right) => left * right,
    '/': (left, right) => left / right,
    '%': (left, right) => left % right,
    '**': (left, right) => left ** right,
    // Bitwise operators
    '&': (left, right) => left & right,
    '|': (left, right) => left | right,
    '^': (left, right) => left ^ right,
    '<<': (left, right) => left << right,
    '>>': (left, right) => left >> right,
    '>>>': (left, right) => left >>> right,
    // Type checking operators
    'in': (left, right) => left in right,
    'instanceof': (left, right) => left instanceof right
};