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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 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 | 8x 8x 8x 101x 8x 327x 219x 211x 58x 57x 209x 208x 8x 193x 108x 104x 86x 86x 5x 5x 11x 9x 7x 13x 11x 17x 11x 10x 13x 10x 10x 10x 10x 8x 48x 16x 32x 5x 5x 2x 3x 250x 210x 196x 8x | const { UNITLESS_NUMBERS, SHORTHAND_EXPANSIONS } = require('./constants'); const hash = require('murmurhash-js'); const cssProperties = require('known-css-properties').all; function expandProperty(prop) { return SHORTHAND_EXPANSIONS[prop] || [prop]; } const BASE_FONT_SIZE_PX = 16; function isCustomProperty(name) { return name.startsWith('--'); } function normalizeValue(prop, value) { if (isCustomProperty(prop)) return value; if (typeof value === 'number') { if (prop === 'fontSize') return `${value / BASE_FONT_SIZE_PX}rem`; if (!UNITLESS_NUMBERS.includes(prop)) return `${value}px`; } if (Array.isArray(value)) return value.slice().join(' '); return value; } // Class can't start with number const CLASS_PREFIX = 'c'; function getClass(...args) { return CLASS_PREFIX + hash(JSON.stringify(args)).toString(36); } function camelToHyphen(string) { if (isCustomProperty(string)) return string; return string.replace(/[A-Z]/g, c => `-${c.toLowerCase()}`); } function getDeclaration({ name, value, atRules, pseudoSelectors }) { const cls = getClass({ name, value, atRules, pseudoSelectors }); return ( atRules.map(rule => rule + '{').join('') + '.' + cls + pseudoSelectors.join('') + '{' + camelToHyphen(name) + ':' + normalizeValue(name, value) + '}' + atRules.map(() => '}').join('') ); } function normalizeTime(time) { if (time === 'from') return '0%'; if (time === 'to') return '100%'; return time; } function stringifyKeyframe(time, frame) { if (!Object.keys(frame).length) return ''; const props = Object.entries(frame).map(([key, value]) => { return `${camelToHyphen(key)}:${normalizeValue(key, value)}`; }); return `${normalizeTime(time)}{${props.join(';')}}`; } function stringifyKeyframes(rules) { return Object.entries(rules) .map(([time, frame]) => stringifyKeyframe(time, frame)) .join(''); } function getKeyframes(rules) { const rulesString = stringifyKeyframes(rules); const name = getClass(rulesString); const declaration = `@keyframes ${name}{${rulesString}}`; return { name, declaration }; } const LEGACY_PSEUDO_ELEMENTS = [ ':before', ':after', ':first-letter', ':first-line' ]; function normalizePseudoElements(string) { if (LEGACY_PSEUDO_ELEMENTS.includes(string)) { return ':' + string; } return string; } function minifyProperty(name) { const hyphenName = camelToHyphen(name); if (cssProperties.includes(hyphenName)) { return cssProperties.indexOf(hyphenName).toString(36); } return hash(hyphenName).toString(36); } // Values can be primitives or arrays, nested styles are plain objects function isNestedStyles(item) { return typeof item === 'object' && !Array.isArray(item); } function isAtRule(string) { return string.startsWith('@'); } function isPseudoSelector(string) { return string.startsWith(':'); } module.exports = { expandProperty, getClass, getDeclaration, getKeyframes, normalizePseudoElements, minifyProperty, isNestedStyles, normalizeValue, isAtRule, isPseudoSelector, }; |