Press n or j to go to the next uncovered block, b, p or k for the previous block.
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const fs = require("fs");
const deb = require('../src/deb.js');
const escodegen = require("escodegen");
const espree = require("espree");
const estraverse = require("estraverse");
"use strict";
module.exports = constantFolding;
/**
* This function replaces the operation by a literal
*
* @param {Node} n
*
*/
function replaceByLiteral(n) {
n.type = "Literal";
n.value = eval(`${n.left.raw} ${n.operator} ${n.right.raw}`);
n.raw = String(n.value);
delete n.left;
delete n.right;
}
/**
* A function that blah
* @param {string} code A string blah
* blah document
* @returns {string} Returns an AST tree with the correct output
*
*/
function constantFolding(code) {
const t = espree.parse(code, { ecmaVersion: 6, loc: false });
estraverse.traverse(t, {
leave: function (n) {
if (
n.type == "BinaryExpression" &&
n.left.type == "Literal" && n.right.type == "Literal"
) { replaceByLiteral(n); }
},
});
return escodegen.generate(t);
}
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