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24 |
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25 |
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26 | function normalizeArray(parts, allowAboveRoot) {
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27 |
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28 | var up = 0;
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29 | for (var i = parts.length - 1; i >= 0; i--) {
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30 | var last = parts[i];
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31 | if (last === '.') {
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32 | parts.splice(i, 1);
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33 | } else if (last === '..') {
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34 | parts.splice(i, 1);
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35 | up++;
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36 | } else if (up) {
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37 | parts.splice(i, 1);
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38 | up--;
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39 | }
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40 | }
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41 |
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42 |
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43 | if (allowAboveRoot) {
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44 | for (; up--; up) {
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45 | parts.unshift('..');
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46 | }
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47 | }
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48 |
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49 | return parts;
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50 | }
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51 |
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52 |
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53 |
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54 | var splitPathRe =
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55 | /^(\/?|)([\s\S]*?)((?:\.{1,2}|[^\/]+?|)(\.[^.\/]*|))(?:[\/]*)$/;
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56 | var splitPath = function(filename) {
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57 | return splitPathRe.exec(filename).slice(1);
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58 | };
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59 |
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60 |
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61 |
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62 | export function resolve() {
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63 | var resolvedPath = '',
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64 | resolvedAbsolute = false;
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65 |
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66 | for (var i = arguments.length - 1; i >= -1 && !resolvedAbsolute; i--) {
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67 | var path = (i >= 0) ? arguments[i] : '/';
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68 |
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69 |
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70 | if (typeof path !== 'string') {
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71 | throw new TypeError('Arguments to path.resolve must be strings');
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72 | } else if (!path) {
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73 | continue;
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74 | }
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75 |
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76 | resolvedPath = path + '/' + resolvedPath;
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77 | resolvedAbsolute = path.charAt(0) === '/';
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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 |
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83 |
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84 | resolvedPath = normalizeArray(filter(resolvedPath.split('/'), function(p) {
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85 | return !!p;
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86 | }), !resolvedAbsolute).join('/');
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87 |
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88 | return ((resolvedAbsolute ? '/' : '') + resolvedPath) || '.';
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89 | };
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90 |
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91 |
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92 |
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93 | export function normalize(path) {
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94 | var isPathAbsolute = isAbsolute(path),
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95 | trailingSlash = substr(path, -1) === '/';
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96 |
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97 |
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98 | path = normalizeArray(filter(path.split('/'), function(p) {
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99 | return !!p;
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100 | }), !isPathAbsolute).join('/');
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101 |
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102 | if (!path && !isPathAbsolute) {
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103 | path = '.';
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104 | }
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105 | if (path && trailingSlash) {
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106 | path += '/';
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107 | }
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108 |
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109 | return (isPathAbsolute ? '/' : '') + path;
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110 | };
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111 |
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112 |
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113 | export function isAbsolute(path) {
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114 | return path.charAt(0) === '/';
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115 | }
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116 |
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117 |
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118 | export function join() {
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119 | var paths = Array.prototype.slice.call(arguments, 0);
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120 | return normalize(filter(paths, function(p, index) {
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121 | if (typeof p !== 'string') {
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122 | throw new TypeError('Arguments to path.join must be strings');
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123 | }
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124 | return p;
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125 | }).join('/'));
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126 | }
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127 |
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128 |
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129 |
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130 |
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131 | export function relative(from, to) {
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132 | from = resolve(from).substr(1);
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133 | to = resolve(to).substr(1);
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134 |
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135 | function trim(arr) {
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136 | var start = 0;
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137 | for (; start < arr.length; start++) {
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138 | if (arr[start] !== '') break;
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139 | }
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140 |
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141 | var end = arr.length - 1;
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142 | for (; end >= 0; end--) {
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143 | if (arr[end] !== '') break;
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144 | }
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145 |
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146 | if (start > end) return [];
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147 | return arr.slice(start, end - start + 1);
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148 | }
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149 |
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150 | var fromParts = trim(from.split('/'));
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151 | var toParts = trim(to.split('/'));
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152 |
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153 | var length = Math.min(fromParts.length, toParts.length);
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154 | var samePartsLength = length;
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155 | for (var i = 0; i < length; i++) {
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156 | if (fromParts[i] !== toParts[i]) {
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157 | samePartsLength = i;
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158 | break;
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159 | }
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160 | }
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161 |
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162 | var outputParts = [];
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163 | for (var i = samePartsLength; i < fromParts.length; i++) {
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164 | outputParts.push('..');
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165 | }
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166 |
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167 | outputParts = outputParts.concat(toParts.slice(samePartsLength));
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168 |
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169 | return outputParts.join('/');
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170 | }
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171 |
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172 | export var sep = '/';
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173 | export var delimiter = ':';
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174 |
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175 | export function dirname(path) {
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176 | var result = splitPath(path),
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177 | root = result[0],
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178 | dir = result[1];
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179 |
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180 | if (!root && !dir) {
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181 |
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182 | return '.';
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183 | }
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184 |
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185 | if (dir) {
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186 |
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187 | dir = dir.substr(0, dir.length - 1);
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188 | }
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189 |
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190 | return root + dir;
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191 | }
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192 |
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193 | export function basename(path, ext) {
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194 | var f = splitPath(path)[2];
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195 |
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196 | if (ext && f.substr(-1 * ext.length) === ext) {
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197 | f = f.substr(0, f.length - ext.length);
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198 | }
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199 | return f;
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200 | }
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201 |
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202 |
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203 | export function extname(path) {
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204 | return splitPath(path)[3];
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205 | }
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206 | export default {
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207 | extname: extname,
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208 | basename: basename,
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209 | dirname: dirname,
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210 | sep: sep,
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211 | delimiter: delimiter,
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212 | relative: relative,
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213 | join: join,
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214 | isAbsolute: isAbsolute,
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215 | normalize: normalize,
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216 | resolve: resolve
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217 | };
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218 | function filter (xs, f) {
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219 | if (xs.filter) return xs.filter(f);
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220 | var res = [];
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221 | for (var i = 0; i < xs.length; i++) {
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222 | if (f(xs[i], i, xs)) res.push(xs[i]);
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223 | }
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224 | return res;
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225 | }
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226 |
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227 |
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228 | var substr = 'ab'.substr(-1) === 'b' ?
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229 | function (str, start, len) { return str.substr(start, len) } :
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230 | function (str, start, len) {
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231 | if (start < 0) start = str.length + start;
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232 | return str.substr(start, len);
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233 | }
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234 | ;
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