1 | export const cssProperties = ['float'].concat(Object.keys(
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2 | findWidth(document.documentElement.style)
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3 | ).filter(p => p.indexOf('-') === -1 && p !== 'length'))
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4 |
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5 | function findWidth(obj) {
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6 | return obj.hasOwnProperty('width')
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7 | ? obj
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8 | : findWidth(Object.getPrototypeOf(obj))
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9 | }
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10 |
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11 | export const memoize = (fn, cache = {}) => item =>
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12 | item in cache
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13 | ? cache[item]
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14 | : cache[item] = fn(item)
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15 |
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16 | export function add(style, prop, value) {
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17 | if (prop in style)
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18 | add(style, '!' + prop, value)
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19 | else
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20 | style[prop] = value
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21 | }
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22 |
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23 | export const vendorMap = Object.create(null, {})
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24 | export const vendorValuePrefix = Object.create(null, {})
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25 |
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26 | export const vendorRegex = /^(o|O|ms|MS|Ms|moz|Moz|webkit|Webkit|WebKit)([A-Z])/
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27 |
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28 | const appendPx = memoize(prop => {
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29 | const el = document.createElement('div')
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30 |
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31 | try {
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32 | el.style[prop] = '1px'
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33 | el.style.setProperty(prop, '1px')
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34 | return el.style[prop].slice(-3) === '1px' ? 'px' : ''
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35 | } catch (err) {
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36 | return ''
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37 | }
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38 | }, {
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39 | flex: '',
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40 | boxShadow: 'px',
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41 | border: 'px'
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42 | })
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43 |
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44 | export function lowercaseFirst(string) {
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45 | return string.charAt(0).toLowerCase() + string.slice(1)
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46 | }
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47 |
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48 | export function sanitize(styles) {
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49 | return Object.keys(styles).reduce((acc, key) => {
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50 | const value = styles[key]
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51 |
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52 | if (!value && value !== 0 && value !== '')
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53 | return acc
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54 |
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55 | if (key === 'content' && value.charAt(0) !== '"')
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56 | acc[key] = '"' + value + '"'
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57 | else
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58 | acc[key in vendorMap ? vendorMap[key] : key] = formatValue(key, value)
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59 |
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60 | return acc
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61 | }, {})
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62 | }
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63 |
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64 | export function assign(obj, obj2) {
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65 | for (const key in obj2) {
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66 | if (obj2.hasOwnProperty(key))
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67 | obj[key] = obj2[key]
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68 | }
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69 | }
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70 |
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71 | export function hyphenToCamelCase(hyphen) {
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72 | return hyphen.slice(hyphen.charAt(0) === '-' ? 1 : 0).replace(/-([a-z])/g, function(match) {
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73 | return match[1].toUpperCase()
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74 | })
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75 | }
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76 |
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77 | export function camelCaseToHyphen(camelCase) {
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78 | return camelCase.replace(/([A-Z])/g, '-$1').toLowerCase()
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79 | }
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80 |
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81 | export function initials(camelCase) {
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82 | return camelCase.charAt(0) + (camelCase.match(/([A-Z])/g) || []).join('').toLowerCase()
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83 | }
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84 |
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85 | export function objectToRules(style, selector, suffix = '', single) {
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86 | const base = {}
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87 |
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88 | let rules = []
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89 |
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90 | Object.keys(style).forEach(prop => {
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91 | if (prop.charAt(0) === '@')
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92 | rules.push(prop + '{' + objectToRules(style[prop], selector, suffix, single) + '}')
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93 | else if (typeof style[prop] === 'object')
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94 | rules = rules.concat(objectToRules(style[prop], selector, suffix + prop, single))
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95 | else
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96 | base[prop] = style[prop]
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97 | })
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98 |
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99 | if (Object.keys(base).length) {
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100 | rules.unshift(
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101 | ((single || (suffix.charAt(0) === ' ') ? '' : '&') + '&' + suffix).replace(/&/g, selector) +
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102 | '{' + stylesToCss(base) + '}'
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103 | )
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104 | }
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105 |
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106 | return rules
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107 | }
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108 |
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109 | export const selectorSplit = /,(?=(?:(?:[^"]*"){2})*[^"]*$)/
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110 |
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111 | export function stylesToCss(style) {
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112 | return Object.keys(style).reduce((acc, prop) =>
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113 | acc + propToString(prop.replace(/!/g, ''), style[prop])
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114 | , '')
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115 | }
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116 |
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117 | export function readClasses(sheet) {
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118 | throw new Error('not implemented')
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119 | }
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120 |
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121 | function propToString(prop, value) {
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122 | return (vendorRegex.test(prop) ? '-' : '')
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123 | + (prop.charAt(0) === '-' && prop.charAt(1) === '-'
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124 | ? prop
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125 | : camelCaseToHyphen(prop)
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126 | )
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127 | + ':'
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128 | + value
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129 | + ';'
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130 | }
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131 |
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132 | export function formatValue(key, value) {
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133 | return value in vendorValuePrefix
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134 | ? vendorValuePrefix[value]
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135 | : addPx(key, value)
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136 | }
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137 |
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138 | export function addPx(key, value) {
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139 | return value + (isNaN(value) ? '' : appendPx(key))
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140 | }
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