1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 | 73x 3x 71x 45x 3x 3x 3x 3x 2x 1x 71x 69x 9x 60x 59x 2x 57x 2x 55x 2x 53x 2x 51x 2x 49x 2x 47x 2x 34x 34x 34x 34x 34x 34x 33x 33x 33x 33x 33x 33x 33x 32x 32x 1x 32x 32x 33x 33x 1x 1x 33x 34x 34x 33x 33x 32x 1x 33x 32x 32x 32x 33x 39x 23x 15x 16x 28x 16x 33x 33x 33x 1x 32x 486x 32x 32x 32x 32x 116x 116x 114x 114x 358x 358x 141x 2x 139x 215x 215x 157x 58x 43x 23x 139x 139x 41x 114x 114x 114x 32x 116x 2x 114x 114x 2x 112x 139x 157x 54x 54x 54x 91x 63x 38x 54x 27x 13x 103x 103x 86x 28x 71x 59x 43x 16x | // @flow import fs from 'fs' import path from 'path' import glob from 'glob' import defaultOptions from './constants/defaultOptions' import postcss from 'postcss' import selectorParser from 'postcss-selector-parser' import { CONFIG_FILENAME, ERROR_CONFIG_FILE_LOADING, ERROR_MISSING_CONTENT, ERROR_MISSING_CSS, ERROR_EXTRACTER_FAILED, ERROR_OPTIONS_TYPE, ERROR_OUTPUT_TYPE, ERROR_EXTRACTERS_TYPE, ERROR_WHITELIST_TYPE, ERROR_STDOUT_TYPE, ERROR_INFO_TYPE, ERROR_REJECTED_TYPE, ERROR_WHITELIST_PATTERNS_TYPE, IGNORE_ANNOTATION } from './constants/constants' import CSS_WHITELIST from './constants/cssWhitelist' import SELECTOR_STANDARD_TYPES from './constants/selectorTypes' import DefaultExtractor from './Extractors/DefaultExtractor' import LegacyExtractor from './Extractors/LegacyExtractor' class Purgecss { options: Options constructor(options: Options | string) { if (typeof options === 'string' || typeof options === 'undefined') options = this.loadConfigFile(options) this.checkOptions(options) this.options = Object.assign(defaultOptions, options) } /** * Load the configuration file from the path * @param {string} configFile Path of the config file */ loadConfigFile(configFile: string): Options { const pathConfig = typeof configFile === 'undefined' ? CONFIG_FILENAME : configFile let options try { const t = path.resolve(process.cwd(), pathConfig) options = require(t) } catch (e) { throw new Error(ERROR_CONFIG_FILE_LOADING + e.message) } return options } /** * Verify that the purgecss options provided are valid * @param {object} options Purgecss options */ checkOptions(options: Options) { if (typeof options !== 'object') throw new TypeError(ERROR_OPTIONS_TYPE) if (!options.content || !options.content.length) throw new Error(ERROR_MISSING_CONTENT) if (!options.css || !options.css.length) throw new Error(ERROR_MISSING_CSS) if (options.output && typeof options.output !== 'string') throw new TypeError(ERROR_OUTPUT_TYPE) if (options.extractors && !Array.isArray(options.extractors)) throw new TypeError(ERROR_EXTRACTERS_TYPE) if (options.whitelist && !Array.isArray(options.whitelist)) throw new TypeError(ERROR_WHITELIST_TYPE) if (options.stdout && typeof options.stdout !== 'boolean') throw new TypeError(ERROR_STDOUT_TYPE) if (options.info && typeof options.info !== 'boolean') throw new TypeError(ERROR_INFO_TYPE) if (options.rejected && typeof options.rejected !== 'boolean') throw new TypeError(ERROR_REJECTED_TYPE) if (options.whitelistPatterns && !Array.isArray(options.whitelistPatterns)) throw new TypeError(ERROR_WHITELIST_PATTERNS_TYPE) } /** * Main function that purge the css file */ purge(): Array<ResultPurge> { // Get selectors from content files const { content, extractors, css } = this.options const fileFormatContents = ((content.filter( o => typeof o === 'string' ): Array<any>): Array<string>) const rawFormatContents = ((content.filter( o => typeof o === 'object' ): Array<any>): Array<RawContent>) const cssFileSelectors = this.extractFileSelector( fileFormatContents, extractors ) const cssRawSelectors = this.extractRawSelector( rawFormatContents, extractors ) // Get css selectors and remove unused ones return this.getCssContents( css, new Set([...cssFileSelectors, ...cssRawSelectors]) ) } /** * Get the content of the css files, or return the raw content * @param {array} cssOptions Array of css options, files and raw * @param {Set} cssSelectors Set of all extracted css selectors */ getCssContents( cssOptions: Array<any>, cssSelectors: Set<string> ): Array<ResultPurge> { const sources = [] for (let option of cssOptions) { let file = null let cssContent = '' if (typeof option === 'string') { file = option cssContent = this.options.stdin ? file : fs.readFileSync(file, 'utf8') } else { cssContent = option.raw } sources.push({ file, css: this.getSelectorsCss(cssContent, cssSelectors) }) } return sources } /** * Extract the selectors present in the passed string using a purgecss extractor * @param {array} content Array of content * @param {array} extractors Array of extractors */ extractRawSelector( content: Array<RawContent>, extractors?: Array<ExtractorsObj> ): Set<string> { let selectors = new Set() for (const { raw, extension } of content) { const extractor = this.getFileExtractor(`.${extension}`, extractors) selectors = new Set([ ...selectors, ...this.extractSelectors(raw, extractor) ]) } return selectors } /** * Extract the selectors present in the files using a purgecss extractor * @param {array} files Array of files path or glob pattern * @param {array} extractors Array of extractors */ extractFileSelector( files: Array<string>, extractors?: Array<ExtractorsObj> ): Set<string> { let selectors = new Set() for (let globfile of files) { let filesnames = [] if (fs.existsSync(globfile)) { filesnames.push(globfile) } else { filesnames = glob.sync(globfile) } for (let file of filesnames) { const content = fs.readFileSync(file, 'utf8') const extractor = this.getFileExtractor(file, extractors) selectors = new Set([ ...selectors, ...this.extractSelectors(content, extractor) ]) } } return selectors } /** * Get the extractor corresponding to the extension file * @param {string} filename Name of the file * @param {array} extractors Array of extractors definition objects */ getFileExtractor(filename: string, extractors: Array<ExtractorsObj> = []) { if (!extractors.length) { if (this.options.legacy === true) return LegacyExtractor return DefaultExtractor } const extractorObj: any = extractors.find(extractor => extractor.extensions.find(ext => filename.endsWith(ext)) ) return extractorObj.extractor } /** * Use the extract function of the extractor to get the list of selectors * @param {string} content Content (e.g: html file) * @param {object} extractor Purgecss extractor use to extract the selector */ extractSelectors(content: string, extractor: Object): Set<string> { let selectors = new Set() const arraySelector = extractor.extract(content) if (arraySelector === null) { throw new Error(ERROR_EXTRACTER_FAILED) } arraySelector.forEach(selector => { selectors.add(selector) }) // Remove empty string selectors.delete('') return selectors } /** * Use postcss to walk through the css ast and remove unused css * @param {string} css css to remove selectors from * @param {*} selectors selectors used in content files */ getSelectorsCss(css: string, selectors: Set<string>): string { const root = postcss.parse(css) root.walkRules(node => { const annotation = node.prev() if (this.isIgnoreAnnotation(annotation)) return node.selector = selectorParser(selectorsParsed => { selectorsParsed.walk(selector => { let selectorsInRule = [] if (selector.type === 'selector') { // if inside :not pseudo class, ignore if ( selector.parent && selector.parent.value === ':not' && selector.parent.type === 'pseudo' ) { return } for (let nodeSelector of selector.nodes) { const { type, value } = nodeSelector if ( SELECTOR_STANDARD_TYPES.includes(type) && typeof value !== 'undefined' ) { selectorsInRule.push(value) } else if ( type === 'attribute' && typeof nodeSelector.raws.unquoted !== 'undefined' ) { //selectorsInRule.push(nodeSelector.raws.unquoted) } else if ( type === 'tag' && !/[+]|(even)|(odd)|^\d/.test(value) ) { // test if we do not have a pseudo class parameter (e.g. 2n in :nth-child(2n)) selectorsInRule.push(value) } } let keepSelector = this.shouldKeepSelector( selectors, selectorsInRule ) if (!keepSelector) { selector.remove() } } }) }).processSync(node.selector) const parent = node.parent // // Remove empty rules if (!node.selector) node.remove() if (this.isRuleEmpty(parent)) parent.remove() }) return root.toString() } /** * Check if the node is a css comment to ignore the selector rule * @param {object} node Node of postcss abstract syntax tree */ isIgnoreAnnotation(node: Object): boolean { if (node && node.type === 'comment') { return node.text.includes(IGNORE_ANNOTATION) } return false } /** * Check if the node correspond to an empty css rule * @param {object} node Node of postcss abstract syntax tree */ isRuleEmpty(node: Object): boolean { if ( (node.type === 'decl' && !node.value) || ((node.type === 'rule' && !node.selector) || (node.nodes && !node.nodes.length)) || (node.type === 'atrule' && ((!node.nodes && !node.params) || (!node.params && !node.nodes.length))) ) { return true } return false } /** * Determine if the selector should be kept, based on the selectors found in the files * @param {Set} selectorsInContent Set of css selectors found in the content files * @param {Array} selectorsInRule Array of selectors */ shouldKeepSelector( selectorsInContent: Set<string>, selectorsInRule: Array<string> ): boolean { for (let selector of selectorsInRule) { // legacy if (this.options.legacy) { const sels = selector.split(/[^a-z]/g) let keepSelector = false for (let sel of sels) { if (!sel) continue if (!selectorsInContent.has(sel)) break keepSelector = true } if (keepSelector) return true if ( selectorsInContent.has(selector) || CSS_WHITELIST.includes(selector) || this.isSelectorWhitelisted(selector) ) return true } else { // non legacy extractors // pseudo class const unescapedSelector = selector.replace(/\\/g, '') if (unescapedSelector.startsWith(':')) continue if ( !( selectorsInContent.has(unescapedSelector) || CSS_WHITELIST.includes(unescapedSelector) || this.isSelectorWhitelisted(unescapedSelector) ) ) { return false } } } return this.options.legacy ? false : true } /** * Check if the selector is whitelisted by the options whitelist or whitelistPatterns * @param {string} selector css selector */ isSelectorWhitelisted(selector: string): boolean { return !!( CSS_WHITELIST.includes(selector) || (this.options.whitelist && this.options.whitelist.some((v: string) => v === selector)) || (this.options.whitelistPatterns && this.options.whitelistPatterns.some((v: RegExp) => v.test(selector))) ) } } export default Purgecss |