1 | var DEFAULTS = {
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2 | '*': {
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3 | colors: {
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4 | hexAlpha: false,
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5 | opacity: true
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6 | },
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7 | customUnits: {
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8 | rpx: false
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9 | },
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10 | properties: {
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11 | backgroundClipMerging: true,
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12 | backgroundOriginMerging: true,
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13 | backgroundSizeMerging: true,
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14 | colors: true,
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15 | ieBangHack: false,
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16 | ieFilters: false,
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17 | iePrefixHack: false,
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18 | ieSuffixHack: false,
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19 | merging: true,
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20 | shorterLengthUnits: false,
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21 | spaceAfterClosingBrace: true,
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22 | urlQuotes: true,
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23 | zeroUnits: true
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24 | },
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25 | selectors: {
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26 | adjacentSpace: false,
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27 | ie7Hack: false,
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28 | mergeablePseudoClasses: [
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29 | ':active',
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30 | ':after',
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31 | ':before',
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32 | ':empty',
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33 | ':checked',
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34 | ':disabled',
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35 | ':empty',
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36 | ':enabled',
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37 | ':first-child',
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38 | ':first-letter',
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39 | ':first-line',
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40 | ':first-of-type',
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41 | ':focus',
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42 | ':hover',
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43 | ':lang',
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44 | ':last-child',
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45 | ':last-of-type',
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46 | ':link',
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47 | ':not',
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48 | ':nth-child',
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49 | ':nth-last-child',
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50 | ':nth-last-of-type',
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51 | ':nth-of-type',
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52 | ':only-child',
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53 | ':only-of-type',
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54 | ':root',
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55 | ':target',
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56 | ':visited'
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57 | ],
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58 | mergeablePseudoElements: [
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59 | '::after',
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60 | '::before',
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61 | '::first-letter',
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62 | '::first-line'
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63 | ],
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64 | mergeLimit: 8191,
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65 | multiplePseudoMerging: true
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66 | },
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67 | units: {
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68 | ch: true,
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69 | in: true,
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70 | pc: true,
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71 | pt: true,
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72 | rem: true,
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73 | vh: true,
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74 | vm: true,
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75 | vmax: true,
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76 | vmin: true,
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77 | vw: true
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78 | }
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79 | }
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80 | };
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81 |
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82 | DEFAULTS.ie11 = merge(DEFAULTS['*'], {
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83 | properties: {
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84 | ieSuffixHack: true
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85 | }
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86 | });
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87 |
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88 | DEFAULTS.ie10 = merge(DEFAULTS['*'], {
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89 | properties: {
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90 | ieSuffixHack: true
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91 | }
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92 | });
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93 |
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94 | DEFAULTS.ie9 = merge(DEFAULTS['*'], {
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95 | properties: {
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96 | ieFilters: true,
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97 | ieSuffixHack: true
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98 | }
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99 | });
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100 |
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101 | DEFAULTS.ie8 = merge(DEFAULTS.ie9, {
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102 | colors: {
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103 | opacity: false
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104 | },
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105 | properties: {
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106 | backgroundClipMerging: false,
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107 | backgroundOriginMerging: false,
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108 | backgroundSizeMerging: false,
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109 | iePrefixHack: true,
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110 | merging: false
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111 | },
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112 | selectors: {
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113 | mergeablePseudoClasses: [
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114 | ':after',
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115 | ':before',
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116 | ':first-child',
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117 | ':first-letter',
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118 | ':focus',
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119 | ':hover',
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120 | ':visited'
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121 | ],
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122 | mergeablePseudoElements: []
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123 | },
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124 | units: {
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125 | ch: false,
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126 | rem: false,
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127 | vh: false,
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128 | vm: false,
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129 | vmax: false,
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130 | vmin: false,
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131 | vw: false
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132 | }
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133 | });
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134 |
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135 | DEFAULTS.ie7 = merge(DEFAULTS.ie8, {
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136 | properties: {
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137 | ieBangHack: true
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138 | },
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139 | selectors: {
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140 | ie7Hack: true,
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141 | mergeablePseudoClasses: [
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142 | ':first-child',
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143 | ':first-letter',
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144 | ':hover',
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145 | ':visited'
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146 | ]
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147 | },
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148 | });
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149 |
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150 | function compatibilityFrom(source) {
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151 | return merge(DEFAULTS['*'], calculateSource(source));
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152 | }
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153 |
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154 | function merge(source, target) {
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155 | for (var key in source) {
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156 | if (Object.prototype.hasOwnProperty.call(source, key)) {
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157 | var value = source[key];
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158 |
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159 | if (Object.prototype.hasOwnProperty.call(target, key) && typeof value === 'object' && !Array.isArray(value)) {
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160 | target[key] = merge(value, target[key] || {});
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161 | } else {
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162 | target[key] = key in target ? target[key] : value;
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163 | }
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164 | }
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165 | }
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166 |
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167 | return target;
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168 | }
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169 |
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170 | function calculateSource(source) {
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171 | if (typeof source == 'object')
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172 | return source;
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173 |
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174 | if (!/[,\+\-]/.test(source))
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175 | return DEFAULTS[source] || DEFAULTS['*'];
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176 |
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177 | var parts = source.split(',');
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178 | var template = parts[0] in DEFAULTS ?
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179 | DEFAULTS[parts.shift()] :
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180 | DEFAULTS['*'];
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181 |
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182 | source = {};
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183 |
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184 | parts.forEach(function (part) {
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185 | var isAdd = part[0] == '+';
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186 | var key = part.substring(1).split('.');
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187 | var group = key[0];
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188 | var option = key[1];
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189 |
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190 | source[group] = source[group] || {};
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191 | source[group][option] = isAdd;
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192 | });
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193 |
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194 | return merge(template, source);
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195 | }
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196 |
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197 | module.exports = compatibilityFrom;
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