walt-compiler

<!doctype html> <html lang="en"> <head> <title>Code coverage report for src/core/unary.js</title> <meta charset="utf-8" /> <link rel="stylesheet" href="../../prettify.css" /> <link rel="stylesheet" href="../../base.css" /> <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> / <a href="index.html">src/core</a> unary.js </h1> <div class='clearfix'> <div class='fl pad1y space-right2'> 100% Statements 17/17 </div> <div class='fl pad1y space-right2'> 100% Branches 6/6 </div> <div class='fl pad1y space-right2'> 100% Functions 3/3 </div> <div class='fl pad1y space-right2'> 100% Lines 16/16 </div> </div> </div> <div class='status-line high'></div> <pre><table class="coverage"> <tr><td class="line-count quiet">1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79</td><td class="line-coverage quiet">          23x     23x           23x               90x   90x 90x 88x     174x 88x     1x 1x         1x 1x       86x 84x                       2x                                          </td><td class="text"><pre class="prettyprint lang-js">/** * Unary operator plugin. * * @flow */ import Syntax from 'walt-syntax'; import type { SemanticPlugin } from '../flow/types';   const shifts = { i64: 63, f64: 63, i32: 31, f32: 31, }; const masks = { i64: '0xffffffffffff', f64: '0xffffffffffff', i32: '0xffffff', f32: '0xffffff', }; // Unary expressions need to be patched so that the LHS type matches the RHS export default function(): SemanticPlugin { return { semantics({ stmt }) { return { [Syntax.UnaryExpression]: _ignore => (args, transform) => { const [unaryNode, context] = args; // While it's counter-intuitive that an unary operation would have two operands // it is simpler to always parse them as pseudo-binary and then simplify them here. const [lhs, rhs] = unaryNode.params.map(p => transform([p, context])); switch (unaryNode.value) { // Transform bang case '!': const shift = shifts[lhs.type]; return transform([ stmt`(((${lhs} >> ${shift}) | ((~${lhs} + 1) >> ${shift})) + 1);`, context, ]); case '~': const mask = masks[transform([lhs, context]).type]; return transform([stmt`(${lhs} ^ ${mask});`, context]); case '-': // Fold negation into a single opcode (a negative constant). // The parser _currently_ generates 0 - <const> node pairs instead if (rhs.Type === Syntax.Constant) { return { ...rhs, meta: { ...rhs.meta, // Hint for generator SIGN: -1, }, }; } // fallthrough // eslint-disable-next-line default: return transform([ { ...unaryNode, type: rhs.type, params: [ { ...lhs, type: rhs.type, }, rhs, ], Type: Syntax.BinaryExpression, }, context, ]); } }, }; }, }; }  </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">istanbul</a> at Sun Dec 23 2018 17:46:36 GMT+0000 (UTC) </div> </div> <script src="../../prettify.js"></script> <script> window.onload = function () { if (typeof prettyPrint === 'function') { prettyPrint(); } }; </script> <script src="../../sorter.js"></script> </body> </html>