@asm80/core

<!doctype html> <html lang="en"> <head> <title>Code coverage report for asm80-core/utils/fp.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> / <a href="index.html">asm80-core/utils</a> fp.js</h1> <div class='clearfix'> <div class='fl pad1y space-right2'> <span class="strong">100% </span> <span class="quiet">Statements</span> <span class='fraction'>58/58</span> </div> <div class='fl pad1y space-right2'> <span class="strong">100% </span> <span class="quiet">Branches</span> <span class='fraction'>32/32</span> </div> <div class='fl pad1y space-right2'> <span class="strong">100% </span> <span class="quiet">Functions</span> <span class='fraction'>2/2</span> </div> <div class='fl pad1y space-right2'> <span class="strong">100% </span> <span class="quiet">Lines</span> <span class='fraction'>58/58</span> </div> </div> <p class="quiet"> Press <em>n</em> or <em>j</em> to go to the next uncovered block, <em>b</em>, <em>p</em> or <em>k</em> for the previous block. </p> <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 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class="line-coverage quiet"><span class="cline-any cline-yes">1x</span> <span class="cline-any cline-yes">1x</span> <span class="cline-any cline-yes">1x</span> <span class="cline-any cline-yes">1x</span> <span class="cline-any cline-yes">1x</span> <span class="cline-any cline-yes">1x</span> <span class="cline-any cline-yes">1x</span> <span class="cline-any cline-yes">1x</span> <span class="cline-any cline-yes">26x</span> <span class="cline-any cline-yes">26x</span> <span class="cline-any cline-yes">26x</span> <span class="cline-any cline-yes">26x</span> <span class="cline-any cline-yes">26x</span> <span class="cline-any cline-yes">26x</span> <span class="cline-any cline-yes">2x</span> <span class="cline-any cline-yes">2x</span> <span class="cline-any cline-yes">2x</span> <span class="cline-any cline-yes">24x</span> <span class="cline-any cline-yes">24x</span> <span class="cline-any cline-yes">24x</span> <span class="cline-any cline-yes">22x</span> <span class="cline-any cline-yes">22x</span> <span class="cline-any cline-yes">22x</span> <span class="cline-any cline-yes">704x</span> <span class="cline-any cline-yes">704x</span> <span class="cline-any cline-yes">704x</span> <span class="cline-any cline-yes">108x</span> <span class="cline-any cline-yes">108x</span> <span class="cline-any cline-yes">108x</span> <span class="cline-any cline-yes">704x</span> <span class="cline-any cline-yes">704x</span> <span class="cline-any cline-yes">704x</span> <span class="cline-any cline-yes">704x</span> <span class="cline-any cline-yes">704x</span> <span class="cline-any cline-yes">704x</span> <span class="cline-any cline-yes">88x</span> <span class="cline-any cline-yes">88x</span> <span class="cline-any cline-yes">88x</span> <span class="cline-any cline-yes">704x</span> <span class="cline-any cline-yes">22x</span> <span class="cline-any cline-yes">24x</span> <span class="cline-any cline-yes">24x</span> <span class="cline-any cline-yes">24x</span> <span class="cline-any cline-yes">24x</span> <span class="cline-any cline-yes">26x</span> <span class="cline-any cline-yes">26x</span> <span class="cline-any cline-yes">22x</span> <span class="cline-any cline-yes">22x</span> <span class="cline-any cline-yes">22x</span> <span class="cline-any cline-yes">26x</span> <span class="cline-any cline-yes">1x</span> <span class="cline-any cline-yes">26x</span> <span class="cline-any cline-yes">21x</span> <span class="cline-any cline-yes">21x</span> <span class="cline-any cline-yes">22x</span> <span class="cline-any cline-yes">22x</span> <span class="cline-any cline-yes">22x</span> <span class="cline-any cline-yes">1x</span></td><td class="text"><pre class="prettyprint lang-js">/** * Convert a number to ZX Spectrum floating-point format (5 bytes) * @param {number} num - Number to convert * @param {boolean} [simpleint=true] - If true, integers are stored as simple integers when possible * @returns {number[]} Array of 5 bytes representing the number in ZX format [exponent, byte0, byte1, byte2, byte3] * @throws {Error} When number is too large (overflow) */ export const fptozx = (num, simpleint) => { simpleint = simpleint === undefined ? true : simpleint; let sgn = num < 0; let m = sgn ? -num : num; // Handle integers in range -65535 to 65535 as simple format if (simpleint && num == Math.floor(num) && num >= -65535 && num <= 65535) { m = sgn ? 65536 + num : num; return [0, sgn ? 0xff : 0, m & 0xff, (m >> 8) & 0xff, 0]; } // Generate 32-bit mantissa representation let bit32 = function (m, sgn) { let out = ""; let a = []; for (let i = 0; i < 32; i++) { let bit = "0"; m = m * 2; if (m >= 1.0) { m -= 1.0; bit = "1"; } // Set sign bit at position 0 if (sgn && i === 0) bit = "1"; if (!sgn && i === 0) bit = "0"; out += bit; // Convert each 8-bit chunk to byte if (i % 8 == 7) { a.push(parseInt(out, 2)); out = ""; } } return a; }; // Calculate exponent let e = Math.floor(Math.log2(m) + 1); if (e > 127) throw new Error("Overflow"); if (e < -127) return [0, 0, 0, 0, 0]; // Underflow to zero // Normalize mantissa to range [0.5, 1) let i; if (e < 0) { for (i = 0; i < -e; i++) m = m * 2; } else { for (i = 0; i < e; i++) m = m / 2; } let n = bit32(m, sgn); return [e + 128, n[0], n[1], n[2], n[3]]; // Bias exponent by 128 };</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 2025-06-24T15:15:27.758Z </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>