1 | 'use strict';
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2 |
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3 |
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4 |
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5 | const nothingHappend = {
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6 | prop: {},
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7 | eaten: '',
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8 | };
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9 |
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10 | const defaultConfig = {
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11 | defaultValue: () => undefined,
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12 | };
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13 |
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14 | function parse(value, indexNext, userConfig) {
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15 |
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16 | let letsEat = '';
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17 | let stopOnBrace = false;
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18 | let errorDetected = false;
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19 | const config = {...defaultConfig, ...userConfig};
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20 |
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21 |
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22 | if (typeof (config.defaultValue) !== 'function') {
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23 | const {defaultValue} = config;
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24 | config.defaultValue = () => defaultValue;
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25 | }
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26 |
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27 | const prop = {};
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28 |
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29 |
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30 | |
31 |
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32 | let labelFirst = '';
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33 | let labelSecond;
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34 |
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35 | if (indexNext === undefined) {
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36 | indexNext = 0;
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37 | }
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38 |
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39 | |
40 |
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41 |
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42 |
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43 |
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44 |
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45 |
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46 | let type;
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47 | const forbidenCharacters = '\n\r{}';
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48 |
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49 |
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50 | const shouldStop = function () {
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51 | if (indexNext >= value.length || forbidenCharacters.indexOf(value[indexNext]) > -1) {
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52 | if (stopOnBrace && value[indexNext] !== '}') {
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53 | errorDetected = true;
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54 | }
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55 |
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56 | return true;
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57 | }
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58 |
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59 | return value[indexNext] === '}' && stopOnBrace;
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60 | };
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61 |
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62 | let eaten = '';
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63 |
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64 |
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65 | const eat = chars => {
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66 | eaten = '';
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67 |
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68 | while (indexNext < value.length &&
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69 | forbidenCharacters.indexOf(value.charAt(indexNext)) < 0 &&
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70 | chars.indexOf(value.charAt(indexNext)) >= 0) {
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71 | letsEat += value.charAt(indexNext);
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72 | eaten += value.charAt(indexNext);
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73 | indexNext++;
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74 | }
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75 |
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76 | return shouldStop();
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77 | };
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78 |
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79 | const eatUntil = chars => {
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80 | eaten = '';
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81 |
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82 | while (indexNext < value.length &&
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83 | forbidenCharacters.indexOf(value.charAt(indexNext)) < 0 &&
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84 | chars.indexOf(value.charAt(indexNext)) < 0) {
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85 | letsEat += value.charAt(indexNext);
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86 | eaten += value.charAt(indexNext);
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87 | indexNext++;
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88 | }
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89 |
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90 |
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91 |
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92 | if (labelFirst) {
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93 | labelSecond = eaten;
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94 | } else {
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95 | labelFirst = eaten;
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96 | }
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97 |
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98 | return shouldStop();
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99 | };
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100 |
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101 |
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102 |
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103 | const eatInQuote = quote => {
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104 | eaten = '';
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105 |
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106 | if (value[indexNext] === quote) {
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107 | return;
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108 | }
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109 |
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110 | while (indexNext < value.length &&
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111 | !(quote === value[indexNext] && value[indexNext - 1] !== '\\') &&
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112 | value[indexNext] !== '\n' && value[indexNext] !== '\r') {
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113 | letsEat += value.charAt(indexNext);
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114 | eaten += value.charAt(indexNext);
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115 | indexNext++;
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116 | }
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117 |
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118 |
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119 |
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120 | if (value[indexNext] === '\n' || value[indexNext] === '\r' || indexNext >= value.length) {
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121 | errorDetected = true;
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122 | return true;
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123 | }
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124 |
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125 |
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126 | if (labelFirst) {
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127 | labelSecond = eaten.replace(/\\"/g, '"');
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128 | } else {
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129 | labelFirst = eaten.replace(/\\"/g, '"');
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130 | }
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131 |
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132 | return shouldStop();
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133 | };
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134 |
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135 |
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136 | const eatOne = (c, skipStopCheck) => {
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137 |
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138 | letsEat += c;
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139 | indexNext++;
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140 |
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141 | return skipStopCheck ? false : shouldStop();
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142 | };
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143 |
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144 |
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145 | const eatQuote = q => {
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146 | eatOne(q, true);
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147 | eatInQuote(q, true);
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148 |
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149 | if (value.charAt(indexNext) !== q) {
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150 | return nothingHappend;
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151 | }
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152 |
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153 | if (eatOne(q)) {
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154 | return -1;
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155 | }
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156 | };
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157 |
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158 | let idSetByKey = false;
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159 | const addAttribute = () => {
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160 | switch (type) {
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161 | case 'id':
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162 | if (idSetByKey) {
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163 | prop.id = labelFirst;
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164 | idSetByKey = false;
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165 | } else {
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166 | prop.id = prop.id || labelFirst;
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167 | }
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168 |
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169 | break;
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170 | case 'class':
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171 | if (!prop.class) {
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172 | prop.class = [];
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173 | }
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174 |
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175 | if (prop.class.indexOf(labelFirst) < 0) {
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176 | prop.class.push(labelFirst);
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177 | }
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178 |
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179 | break;
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180 | case 'key':
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181 | if (!labelFirst) {
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182 | return nothingHappend;
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183 | }
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184 |
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185 | if (!(labelFirst in prop)) {
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186 | if (labelSecond === undefined) {
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187 |
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188 | prop[labelFirst] = config.defaultValue(labelFirst);
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189 | } else {
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190 | prop[labelFirst] = labelFirst === 'class' ? [labelSecond] : labelSecond;
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191 | }
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192 |
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193 | if (labelFirst === 'id') {
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194 | idSetByKey = true;
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195 | }
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196 | } else if (labelFirst === 'class' && Boolean(labelSecond)) {
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197 | prop.class.push(labelSecond);
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198 | }
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199 |
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200 | break;
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201 | default:
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202 | }
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203 |
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204 | type = undefined;
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205 | labelFirst = '';
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206 | labelSecond = undefined;
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207 | };
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208 |
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209 |
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210 |
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211 |
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212 | eat(' \t\v');
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213 |
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214 | if (value[indexNext] === '{') {
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215 | eatOne('{');
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216 | stopOnBrace = true;
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217 | }
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218 |
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219 | while (!shouldStop()) {
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220 | if (eat(' \t\v')) {
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221 | break;
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222 | }
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223 |
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224 | if (value.charAt(indexNext) === '.') {
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225 | type = 'class';
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226 | if (eatOne('.')) {
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227 | errorDetected = true;
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228 | break;
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229 | }
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230 | } else if (value.charAt(indexNext) === '#') {
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231 | type = 'id';
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232 | if (eatOne('#')) {
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233 | errorDetected = true;
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234 | break;
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235 | }
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236 | } else {
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237 | type = 'key';
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238 | }
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239 |
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240 |
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241 | if (eatUntil('=\t\b\v ') || !labelFirst) {
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242 | break;
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243 | }
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244 |
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245 | if (value.charAt(indexNext) === '=' && type === 'key') {
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246 | if (eatOne('=')) {
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247 | break;
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248 | }
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249 |
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250 | if (value.charAt(indexNext) === '"') {
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251 | const ret = eatQuote('"');
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252 | if (ret === -1) {
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253 | break;
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254 | } else if (ret === nothingHappend) {
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255 | return nothingHappend;
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256 | }
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257 | } else if (value.charAt(indexNext) === '\'') {
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258 | const ret = eatQuote('\'');
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259 | if (ret === -1) {
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260 | break;
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261 | } else if (ret === nothingHappend) {
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262 | return nothingHappend;
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263 | }
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264 | } else if (eatUntil(' \t\n\r\v=}')) {
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265 | break;
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266 | }
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267 | }
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268 |
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269 |
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270 | addAttribute();
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271 | }
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272 |
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273 | addAttribute();
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274 | if (stopOnBrace) {
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275 | if (indexNext < value.length && value[indexNext] === '}') {
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276 | stopOnBrace = false;
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277 | eatOne('}');
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278 | } else {
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279 | return nothingHappend;
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280 | }
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281 | }
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282 |
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283 | return errorDetected ? nothingHappend : {prop, eaten: letsEat};
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284 | }
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285 |
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286 | module.exports = parse;
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