@alu0101353647/constant-folding

<!doctype html> <html lang="en"> <head> <title>Code coverage report for constant-folding.js</title> <meta charset="utf-8" /> <link rel="stylesheet" href="prettify.css" /> <link rel="stylesheet" href="base.css" /> <link rel="shortcut icon" type="image/x-icon" href="favicon.png" /> <meta name="viewport" content="width=device-width, initial-scale=1" /> <style type='text/css'> .coverage-summary .sorter { background-image: url(sort-arrow-sprite.png); } </style> </head> <body> <div class='wrapper'> <div class='pad1'> <h1><a href="index.html">All files</a> constant-folding.js</h1> <div class='clearfix'> <div class='fl pad1y space-right2'> 100% Statements 176/176 </div> <div class='fl pad1y space-right2'> 100% Branches 29/29 </div> <div class='fl pad1y space-right2'> 100% Functions 6/6 </div> <div class='fl pad1y space-right2'> 100% Lines 176/176 </div> </div> Press n or j to go to the next uncovered block, b, p or k for the previous block. <template id="filterTemplate"> <div class="quiet"> Filter: <input oninput="onInput()" type="search" id="fileSearch"> </div> </template> </div> <div class='status-line high'></div> <pre><table class="coverage"> <tr><td class="line-count quiet"><a name='L1'></a><a href='#L1'>1</a> <a name='L2'></a><a href='#L2'>2</a> <a name='L3'></a><a href='#L3'>3</a> <a name='L4'></a><a href='#L4'>4</a> <a name='L5'></a><a href='#L5'>5</a> <a name='L6'></a><a href='#L6'>6</a> <a name='L7'></a><a href='#L7'>7</a> <a name='L8'></a><a href='#L8'>8</a> <a name='L9'></a><a href='#L9'>9</a> <a name='L10'></a><a href='#L10'>10</a> <a name='L11'></a><a href='#L11'>11</a> <a name='L12'></a><a href='#L12'>12</a> <a name='L13'></a><a href='#L13'>13</a> <a name='L14'></a><a href='#L14'>14</a> <a name='L15'></a><a href='#L15'>15</a> <a name='L16'></a><a href='#L16'>16</a> <a name='L17'></a><a href='#L17'>17</a> <a name='L18'></a><a href='#L18'>18</a> <a name='L19'></a><a href='#L19'>19</a> <a name='L20'></a><a href='#L20'>20</a> <a name='L21'></a><a 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1x 3x 2x 2x 3x 3x 3x 3x 3x 3x 3x 1x 1x 1x 1x 1x 1x 1x 1x 1x 3x 2x 2x 6x 6x 2x 2x 2x 2x 2x 2x 11x 11x 17x 17x 17x 17x 17x 1x 1x 1x 1x 1x 1x 17x 2x 2x 2x 2x 2x 2x 2x 17x 17x 17x 17x    </td><td class="text"><pre class="prettyprint lang-js">// See https://github.com/babel/minify/tree/master/packages/babel-plugin-minify-constant-folding const fs = require("fs"); const deb = require('../src/deb.js'); const escodegen = require("escodegen"); const espree = require("espree"); const estraverse = require("estraverse"); const b = require("ast-types").builders; const visit = require("ast-types").visit; const recast = require("recast");     "use strict";   module.exports = {constantFolding, squashArray};     /** * Function that takes an array which may have more arrays within and sets them all in the same * cardinality. This is done recursively. * * For example, [3, [4, 5], [6], [[7], 8]] is transformed into [3, 4, 5, 6, 7, 8] * @param {Node[]} array array of node which has all the arrays to be squashed within. * @return {Node[]} array of Literal nodes. */ function squashArray(array, result = []) { // console.log("DING DONG NEW CALL"); // console.log(array); for (let element of array) { // console.log(element); // console.log("\n"); if (element.type == "ArrayExpression") { // console.log("Result state rn: \n"); // for (let result_element of result) { // console.log(result_element); // } squashArray(element.elements, result); } else { result.push(element); } } // console.log("==========================="); return result; }   /** * A function that does the usual constant folding. * However, it also does constant folding for methods and arguments, * including lists as well. * @param {string} code A string containing the code on which to fold * constants. * @returns {string} Returns the code, reparsed, with the constants and such * folded. */ function constantFolding(code, pattern) { let ast = espree.parse(code, { ecmaVersion: 7, loc: false }); visit(ast, { visitBinaryExpression(path) { const node = path.node; this.traverse(path); if (node.left.type == "Literal" && node.right.type == "Literal") { let result = eval(node.left.value + node.operator + node.right.value); node.type = "Literal"; delete node.operator; delete node.left; delete node.right; node.value = result; node.raw = "" + result; } }, visitArrayExpression(path) { const node = path.node; path.node.elements = squashArray(node.elements); return false; }, visitCallExpression(path) { const node = path.node; this.traverse(path); if (node.callee.type == "MemberExpression") { const callee = node.callee; if (callee.object.type == "ArrayExpression") { let squashedObject = squashArray(callee.object.elements); if (callee.property.name == "concat") { let squashedArguments = squashArray(node.arguments); node.type = "ArrayExpression"; for (let element of squashedArguments) { squashedObject.push(element); } node.elements = squashedObject; path.node = node; return false;   } else if (callee.property.name == "join") { node.type = "Literal"; let value = ""; let separator = ","; if (node.arguments.length !== 0) { separator = node.arguments[0].value; } for (let i = 0; i < squashedObject.length; i += 1) { value += squashedObject[i].value; if (i != squashedObject.length-1) { value += separator; } } node.value = value; node.raw = "\\"+node.value+"\\"; path.node = node; return false;   } else if (callee.property.name == "shift") { node.type = "Literal"; node.value = squashedObject.shift().value; node.raw = "\\"+node.value+"\\"; path.node = node; return false;   } else if (callee.property.name == "slice") { this.traverse(path); let slicedElements; if (node.arguments.length == 1) { slicedElements = callee.object.elements.slice(0, node.arguments[0].value); } else { slicedElements = callee.object.elements.slice(node.arguments[0].value, node.arguments[1].value); } node.type = "ArrayExpression"; node.elements = slicedElements; path.node = node; delete node.callee; delete node.arguments;   } else if (callee.property.name == "pop") { // console.log(squashedObject); let poppedValue = squashedObject[squashedObject.length-1]; node.type = poppedValue.type; // node = poppedValue; // console.log(poppedValue); path.node = node; // console.log(path.node); return false;   } else if (callee.property.name == "reverse") { let reversedArray = []; for (let i = squashedObject.length - 1; i >= 0; i -= 1) { reversedArray.push(squashedObject[i]); } path.node.type = "ArrayExpression"; path.node.elements = reversedArray; delete path.node.callee; delete path.node.arguments; return false; } } } }, visitMemberExpression(path) { const node = path.node; this.traverse(path); if (node.object.type == "ArrayExpression" && node.property.name == "length") { node.object = squashArray(node.object.elements); node.type = "Literal"; node.value = node.object.length; node.raw = `"${node.value}"`; delete node.object; delete node.property; } else if (node.object.type == "ArrayExpression" && node.property.type == "Literal") { node.object = squashArray(node.object.elements); node.type = "Literal"; node.value = node.object[node.property.value].value; node.raw = `"${node.value}"`; delete node.object; delete node.property; } }, }); return recast.print(ast).code; }    </pre></td></tr></table></pre> <div class='push'></div> </div> <div class='footer quiet pad2 space-top1 center small'> Code coverage generated by <a href="https://istanbul.js.org/" target="_blank" rel="noopener noreferrer">istanbul</a> at 2023-03-23T21:20:34.118Z </div> <script src="prettify.js"></script> <script> window.onload = function () { prettyPrint(); }; </script> <script src="sorter.js"></script> <script src="block-navigation.js"></script> </body> </html>