1 |
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2 | var CSSOM = {
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3 | CSSValue: require('./CSSValue').CSSValue
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4 | };
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5 |
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12 |
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13 | CSSOM.CSSValueExpression = function CSSValueExpression(token, idx) {
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14 | this._token = token;
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15 | this._idx = idx;
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16 | };
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17 |
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18 | CSSOM.CSSValueExpression.prototype = new CSSOM.CSSValue();
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19 | CSSOM.CSSValueExpression.prototype.constructor = CSSOM.CSSValueExpression;
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20 |
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35 |
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36 | CSSOM.CSSValueExpression.prototype.parse = function() {
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37 | var token = this._token,
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38 | idx = this._idx;
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39 |
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40 | var character = '',
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41 | expression = '',
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42 | error = '',
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43 | info,
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44 | paren = [];
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45 |
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46 |
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47 | for (; ; ++idx) {
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48 | character = token.charAt(idx);
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49 |
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50 |
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51 | if (character === '') {
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52 | error = 'css expression error: unfinished expression!';
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53 | break;
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54 | }
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55 |
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56 | switch(character) {
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57 | case '(':
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58 | paren.push(character);
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59 | expression += character;
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60 | break;
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61 |
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62 | case ')':
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63 | paren.pop(character);
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64 | expression += character;
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65 | break;
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66 |
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67 | case '/':
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68 | if ((info = this._parseJSComment(token, idx))) {
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69 | if (info.error) {
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70 | error = 'css expression error: unfinished comment in expression!';
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71 | } else {
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72 | idx = info.idx;
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73 |
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74 | }
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75 | } else if ((info = this._parseJSRexExp(token, idx))) {
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76 | idx = info.idx;
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77 | expression += info.text;
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78 | } else {
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79 | expression += character;
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80 | }
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81 | break;
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82 |
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83 | case "'":
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84 | case '"':
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85 | info = this._parseJSString(token, idx, character);
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86 | if (info) {
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87 | idx = info.idx;
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88 | expression += info.text;
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89 | } else {
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90 | expression += character;
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91 | }
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92 | break;
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93 |
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94 | default:
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95 | expression += character;
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96 | break;
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97 | }
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98 |
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99 | if (error) {
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100 | break;
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101 | }
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102 |
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103 |
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104 | if (paren.length === 0) {
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105 | break;
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106 | }
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107 | }
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108 |
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109 | var ret;
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110 | if (error) {
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111 | ret = {
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112 | error: error
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113 | };
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114 | } else {
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115 | ret = {
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116 | idx: idx,
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117 | expression: expression
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118 | };
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119 | }
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120 |
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121 | return ret;
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122 | };
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123 |
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124 |
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129 |
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130 |
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131 |
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132 |
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133 |
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134 |
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135 |
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136 | CSSOM.CSSValueExpression.prototype._parseJSComment = function(token, idx) {
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137 | var nextChar = token.charAt(idx + 1),
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138 | text;
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139 |
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140 | if (nextChar === '/' || nextChar === '*') {
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141 | var startIdx = idx,
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142 | endIdx,
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143 | commentEndChar;
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144 |
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145 | if (nextChar === '/') {
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146 | commentEndChar = '\n';
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147 | } else if (nextChar === '*') {
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148 | commentEndChar = '*/';
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149 | }
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150 |
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151 | endIdx = token.indexOf(commentEndChar, startIdx + 1 + 1);
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152 | if (endIdx !== -1) {
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153 | endIdx = endIdx + commentEndChar.length - 1;
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154 | text = token.substring(idx, endIdx + 1);
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155 | return {
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156 | idx: endIdx,
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157 | text: text
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158 | };
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159 | } else {
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160 | var error = 'css expression error: unfinished comment in expression!';
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161 | return {
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162 | error: error
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163 | };
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164 | }
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165 | } else {
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166 | return false;
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167 | }
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168 | };
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169 |
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170 |
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173 |
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174 |
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175 |
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176 |
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177 |
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178 |
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179 |
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180 | CSSOM.CSSValueExpression.prototype._parseJSString = function(token, idx, sep) {
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181 | var endIdx = this._findMatchedIdx(token, idx, sep),
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182 | text;
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183 |
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184 | if (endIdx === -1) {
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185 | return false;
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186 | } else {
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187 | text = token.substring(idx, endIdx + sep.length);
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188 |
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189 | return {
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190 | idx: endIdx,
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191 | text: text
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192 | };
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193 | }
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194 | };
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253 |
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254 |
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255 | CSSOM.CSSValueExpression.prototype._parseJSRexExp = function(token, idx) {
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256 | var before = token.substring(0, idx).replace(/\s+$/, ""),
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257 | legalRegx = [
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258 | /^$/,
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259 | /\($/,
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260 | /\[$/,
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261 | /\!$/,
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262 | /\+$/,
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263 | /\-$/,
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264 | /\*$/,
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265 | /\/\s+/,
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266 | /\%$/,
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267 | /\=$/,
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268 | /\>$/,
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269 | /<$/,
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270 | /\&$/,
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271 | /\|$/,
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272 | /\^$/,
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273 | /\~$/,
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274 | /\?$/,
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275 | /\,$/,
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276 | /delete$/,
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277 | /in$/,
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278 | /instanceof$/,
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279 | /new$/,
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280 | /typeof$/,
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281 | /void$/
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282 | ];
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283 |
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284 | var isLegal = legalRegx.some(function(reg) {
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285 | return reg.test(before);
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286 | });
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287 |
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288 | if (!isLegal) {
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289 | return false;
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290 | } else {
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291 | var sep = '/';
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292 |
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293 | // same logic as string
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294 | return this._parseJSString(token, idx, sep);
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295 | }
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296 | };
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297 |
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298 |
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299 | /**
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300 | *
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301 | * find next sep(same line) index in `token`
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302 | *
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303 | * @return {Number}
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304 | *
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305 | */
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306 | CSSOM.CSSValueExpression.prototype._findMatchedIdx = function(token, idx, sep) {
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307 | var startIdx = idx,
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308 | endIdx;
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309 |
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310 | var NOT_FOUND = -1;
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311 |
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312 | while(true) {
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313 | endIdx = token.indexOf(sep, startIdx + 1);
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314 |
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315 | if (endIdx === -1) { // not found
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316 | endIdx = NOT_FOUND;
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317 | break;
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318 | } else {
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319 | var text = token.substring(idx + 1, endIdx),
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320 | matched = text.match(/\\+$/);
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321 | if (!matched || matched[0] % 2 === 0) { // not escaped
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322 | break;
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323 | } else {
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324 | startIdx = endIdx;
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325 | }
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326 | }
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327 | }
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328 |
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329 | // boundary must be in the same line(js sting or regexp)
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330 | var nextNewLineIdx = token.indexOf('\n', idx + 1);
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331 | if (nextNewLineIdx < endIdx) {
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332 | endIdx = NOT_FOUND;
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333 | }
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334 |
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335 |
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336 | return endIdx;
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337 | };
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338 |
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339 |
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340 |
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341 |
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342 | //.CommonJS
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343 | exports.CSSValueExpression = CSSOM.CSSValueExpression;
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344 | ///CommonJS
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345 |
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\ | No newline at end of file |