@0ria/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'> 53.65% Statements 22/41 </div> <div class='fl pad1y space-right2'> 52.38% Branches 11/21 </div> <div class='fl pad1y space-right2'> 38.46% Functions 5/13 </div> <div class='fl pad1y space-right2'> 59.45% Lines 22/37 </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 medium'></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 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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");   "use strict";   module.exports = constantFolding;   /** * This function gets passed by a Node and depending on its type will perform * different operations. * @param {Obect} elem Single subNode * @returns */ function getValues(elem) { let types = { 'Literal' : () => {return elem.raw}, 'Identifier' : () => {return elem.name}, 'ArrayExpression' : () => {return `${elem.elements.map(l => getValues(l))}`}, 'BinaryExpression' : () => {return `${eval(`${elem.left.raw} ${elem.operator} ${elem.right.raw}`)}`} } return types[elem.type](); }   /** * This function gets passed two arguments and perform a transformation in the node * depending different parameters. Then it creates a new node object that will substitute * the passed one. * @param {Object} n Node object in which constant folding will be applied * @param {*} args Possible arguments this node has ex: [a].concat([b]), [b] are the args here */ function transNode(n, args) { let argString = "" let auxstring = ""; let a = n.expression;   if (args) { a = n.expression.callee; argString += `(${(args) ? args.map(arg => getValues(arg)) : ''})`; } if (a.property.type == 'Literal') auxString = `[${a.object.elements.map(el => getValues(el))}][${getValues(a.property)}]` + argString; else auxString = `[${a.object.elements.map(el => getValues(el))}].${getValues(a.property)}` + argString;   n.expression = espree.parse(eval(auxString)).body[0].expression; }   /** * This Function takes a Node of type BinaryExpression and perform constant Folding on it * @param {Object} n Node with a type of BinaryExpression */ function transLiteralNode(n) { n.value = Number(getValues(n)); n.raw = String(n.value); n.type = 'Literal'; delete n.left; delete n.rigth; }   /** * This function get passed some code and then it forms an AST tree with it. * After it traverses the tree doing constant folding in different nodes in * which it is possible to perform it * @param {string} code The javascript input code * @returns {string} Generated js code from the resultant tree */ function constantFolding(code) { let ast = espree.parse(code, {ecmaVersion: espree.latestEcmaVersion}); estraverse.traverse(ast, { leave: function(node, parent) { Iif (node.type == 'ExpressionStatement' && node.expression.type == 'CallExpression' && node.expression.callee.object.type == 'ArrayExpression') { transNode(node, node.expression.arguments); } Iif (node.type == 'ExpressionStatement' && node.expression.type == 'MemberExpression' && node.expression.object.type == 'ArrayExpression') { transNode(node); } if(node.type == 'BinaryExpression' && node.left.type == 'Literal' && node.right.type == 'Literal') { transLiteralNode(node); } } }); //deb(ast); return escodegen.generate(ast); }</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 Thu Mar 10 2022 20:41:38 GMT+0000 (Coordinated Universal Time) </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>