1 | 'use strict';
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2 |
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3 | const isNumbery = require('./isNumbery');
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4 | const isStandardSyntaxValue = require('./isStandardSyntaxValue');
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5 | const isValidFontSize = require('./isValidFontSize');
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6 | const isVariable = require('./isVariable');
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7 | const keywordSets = require('../reference/keywordSets');
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8 | const postcssValueParser = require('postcss-value-parser');
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9 |
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10 | const nodeTypesToCheck = new Set(['word', 'string', 'space', 'div']);
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11 |
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12 |
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13 |
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14 |
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15 |
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16 |
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17 |
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18 |
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19 |
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20 |
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21 |
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22 | function joinValueNodes(firstNode, secondNode, charactersBetween) {
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23 | firstNode.value = firstNode.value + charactersBetween + secondNode.value;
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24 |
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25 | return firstNode;
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26 | }
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27 |
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28 |
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29 |
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30 |
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31 |
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32 |
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33 |
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34 | module.exports = function findFontFamily(value) {
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35 |
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36 | const fontFamilies = [];
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37 |
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38 | const valueNodes = postcssValueParser(value);
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39 |
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40 |
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41 | if (
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42 | valueNodes.nodes.length === 1 &&
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43 | keywordSets.basicKeywords.has(valueNodes.nodes[0].value.toLowerCase())
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44 | ) {
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45 | return [valueNodes.nodes[0]];
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46 | }
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47 |
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48 | let needMergeNodesByValue = false;
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49 |
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50 | let mergeCharacters = null;
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51 |
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52 | valueNodes.walk((valueNode, index, nodes) => {
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53 | if (valueNode.type === 'function') {
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54 | return false;
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55 | }
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56 |
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57 | if (!nodeTypesToCheck.has(valueNode.type)) {
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58 | return;
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59 | }
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60 |
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61 | const valueLowerCase = valueNode.value.toLowerCase();
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62 |
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63 |
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64 | if (!isStandardSyntaxValue(valueLowerCase)) {
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65 | return;
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66 | }
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67 |
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68 |
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69 | if (isVariable(valueLowerCase)) {
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70 | return;
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71 | }
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72 |
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73 |
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74 | if (
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75 | keywordSets.fontShorthandKeywords.has(valueLowerCase) &&
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76 | !keywordSets.fontFamilyKeywords.has(valueLowerCase)
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77 | ) {
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78 | return;
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79 | }
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80 |
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81 |
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82 | if (isValidFontSize(valueNode.value)) {
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83 | return;
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84 | }
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85 |
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86 |
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87 | if (
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88 | nodes[index - 1] &&
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89 | nodes[index - 1].value === '/' &&
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90 | nodes[index - 2] &&
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91 | isValidFontSize(nodes[index - 2].value)
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92 | ) {
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93 | return;
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94 | }
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95 |
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96 |
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97 | if (isNumbery(valueLowerCase)) {
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98 | return;
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99 | }
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100 |
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101 |
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102 | if (
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103 | (valueNode.type === 'space' || (valueNode.type === 'div' && valueNode.value !== ',')) &&
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104 | fontFamilies.length !== 0
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105 | ) {
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106 | needMergeNodesByValue = true;
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107 | mergeCharacters = valueNode.value;
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108 |
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109 | return;
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110 | }
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111 |
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112 | if (valueNode.type === 'space' || valueNode.type === 'div') {
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113 | return;
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114 | }
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115 |
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116 | const fontFamily = valueNode;
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117 |
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118 | if (needMergeNodesByValue) {
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119 | joinValueNodes(fontFamilies[fontFamilies.length - 1], valueNode, mergeCharacters);
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120 | needMergeNodesByValue = false;
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121 | mergeCharacters = null;
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122 | } else {
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123 | fontFamilies.push(fontFamily);
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124 | }
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125 | });
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126 |
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127 | return fontFamilies;
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128 | };
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