|
| 1 | +'use strict' |
| 2 | + |
| 3 | +const path = require('path') |
| 4 | +const fs = require('fs-promise') |
| 5 | +const preview = require('cli-source-preview') |
| 6 | +const replaceAsync = require('./replace') |
| 7 | +const co = require('co') |
| 8 | +const async = require('async') |
| 9 | +const sass = require('node-sass') |
| 10 | +const Cache = require('./cache') |
| 11 | +const loaderUtils = require('loader-utils') |
| 12 | + |
| 13 | +const EXT_PRECEDENCE = ['.scss', '.sass', '.css']; |
| 14 | +const MATCH_URL_ALL = /url\(\s*(['"]?)([^ '"\(\)]+)(\1)\s*\)/g; |
| 15 | +const MATCH_IMPORTS = /@import\s+(['"])([^,;'"]+)(\1)(\s*,\s*(['"])([^,;'"]+)(\1))*\s*;/g; |
| 16 | +const MATCH_FILES = /(['"])([^,;'"]+)(\1)/g; |
| 17 | +const BAD_URL_FILE = /(^#)|(^(\w+:)?\/\/)|(^data:)/ |
| 18 | + |
| 19 | +function getImportsToResolve(original) { |
| 20 | + let extname = path.extname(original) |
| 21 | + let basename = path.basename(original, extname) |
| 22 | + let dirname = path.dirname(original) |
| 23 | + |
| 24 | + let imports = [] |
| 25 | + let names = [basename] |
| 26 | + let exts = [extname] |
| 27 | + |
| 28 | + if (!extname) { |
| 29 | + exts = EXT_PRECEDENCE |
| 30 | + } |
| 31 | + if (basename[0] !== '_') { |
| 32 | + names.push('_' + basename) |
| 33 | + } |
| 34 | + |
| 35 | + for (let i = 0; i < names.length; i++) { |
| 36 | + for (let j = 0; j < exts.length; j++) { |
| 37 | + imports.push(path.join(dirname, names[i] + exts[j])) |
| 38 | + } |
| 39 | + } |
| 40 | + |
| 41 | + return imports |
| 42 | +} |
| 43 | + |
| 44 | +function getLoaderConfig(loaderContext) { |
| 45 | + let query = loaderUtils.parseQuery(loaderContext.query); |
| 46 | + let configKey = query.config || 'sassLoader'; |
| 47 | + let config = loaderContext.options[configKey] || {}; |
| 48 | + |
| 49 | + delete query.config; |
| 50 | + |
| 51 | + return Object.assign({}, config, query); |
| 52 | +} |
| 53 | + |
| 54 | +function* mergeSources(opts, entry, resolve, dependencies, level) { |
| 55 | + level = level || 0 |
| 56 | + dependencies = dependencies || [] |
| 57 | + |
| 58 | + let content = false |
| 59 | + |
| 60 | + if (typeof entry === 'object') { |
| 61 | + content = entry.content |
| 62 | + entry = entry.file |
| 63 | + } else { |
| 64 | + content = yield fs.readFile(entry, 'utf8') |
| 65 | + } |
| 66 | + |
| 67 | + let entryDir = path.dirname(entry) |
| 68 | + |
| 69 | + // replace url(...) |
| 70 | + content = content.replace(MATCH_URL_ALL, (total, left, file, right) => { |
| 71 | + if (!file.match(BAD_URL_FILE)) { |
| 72 | + let absoluteFile = path.resolve(entryDir, file) |
| 73 | + let relativeFile = path.relative(opts.baseDir, absoluteFile) |
| 74 | + |
| 75 | + return `url(${relativeFile})` |
| 76 | + } else { |
| 77 | + return total |
| 78 | + } |
| 79 | + }) |
| 80 | + |
| 81 | + // replace @import "..." |
| 82 | + function* importReplacer(total) { |
| 83 | + let contents = [] |
| 84 | + let matched |
| 85 | + |
| 86 | + // must reset lastIndex |
| 87 | + MATCH_FILES.lastIndex = 0 |
| 88 | + |
| 89 | + while (matched = MATCH_FILES.exec(total)) { |
| 90 | + let originalImport = matched[2].trim() |
| 91 | + if (!originalImport) { |
| 92 | + throw new Error(`import file cannot be empty: "${total}" @${entry}`) |
| 93 | + } |
| 94 | + |
| 95 | + let imports = getImportsToResolve(originalImport) |
| 96 | + let resolvedImport |
| 97 | + |
| 98 | + // console.log('resolve ->', imports) |
| 99 | + |
| 100 | + for (let i = 0; i < imports.length; i++) { |
| 101 | + try { |
| 102 | + let reqFile = loaderUtils.urlToRequest(imports[i], opts.root) |
| 103 | + resolvedImport = yield resolve(entryDir, reqFile) |
| 104 | + break; |
| 105 | + } catch (err) { |
| 106 | + // console.log('resolve err: ', err.message) |
| 107 | + // skip |
| 108 | + } |
| 109 | + } |
| 110 | + |
| 111 | + if (!resolvedImport) { |
| 112 | + throw new Error(`import file cannot be resolved: "${total}" @${entry}`) |
| 113 | + } |
| 114 | + |
| 115 | + resolvedImport = path.normalize(resolvedImport) |
| 116 | + |
| 117 | + if (dependencies.indexOf(resolvedImport) < 0) { |
| 118 | + dependencies.push(resolvedImport) |
| 119 | + |
| 120 | + contents.push(yield mergeSources(opts, resolvedImport, resolve, dependencies, level + 1)) |
| 121 | + } |
| 122 | + } |
| 123 | + |
| 124 | + return contents.join('\n') |
| 125 | + } |
| 126 | + |
| 127 | + return yield replaceAsync(content, MATCH_IMPORTS, co.wrap(importReplacer)) |
| 128 | +} |
| 129 | + |
| 130 | +module.exports = function(content) { |
| 131 | + let entry = this.resourcePath |
| 132 | + let callback = this.async() |
| 133 | + let cache = new Cache(entry) |
| 134 | + let options = getLoaderConfig(this) |
| 135 | + let ctx = this |
| 136 | + |
| 137 | + options.baseDir = path.dirname(entry) |
| 138 | + |
| 139 | + this.cacheable() |
| 140 | + |
| 141 | + function resolver(ctx) { |
| 142 | + return function(dir, importFile) { |
| 143 | + return new Promise((resolve, reject) => { |
| 144 | + ctx.resolve(dir, importFile, (err, resolvedFile) => { |
| 145 | + if (err) { |
| 146 | + reject(err) |
| 147 | + } else { |
| 148 | + resolve(resolvedFile) |
| 149 | + } |
| 150 | + }) |
| 151 | + }) |
| 152 | + } |
| 153 | + } |
| 154 | + |
| 155 | + return co(function*() { |
| 156 | + let dependencies = [] |
| 157 | + |
| 158 | + if (cache.isValid()) { |
| 159 | + return cache.read() |
| 160 | + } else { |
| 161 | + console.time('merge') |
| 162 | + let merged = yield mergeSources(options, { |
| 163 | + file: entry, |
| 164 | + content: content |
| 165 | + }, resolver(ctx), dependencies) |
| 166 | + |
| 167 | + console.timeEnd('merge') |
| 168 | + |
| 169 | + try { |
| 170 | + console.time('compile') |
| 171 | + |
| 172 | + let result = yield new Promise((resolve, reject) => { |
| 173 | + sass.render({ |
| 174 | + file: entry, |
| 175 | + data: merged |
| 176 | + }, (err, result) => { |
| 177 | + if (err) { |
| 178 | + reject(err) |
| 179 | + } else { |
| 180 | + resolve(result) |
| 181 | + } |
| 182 | + }) |
| 183 | + }) |
| 184 | + |
| 185 | + dependencies.forEach(file => { |
| 186 | + ctx.dependency(file) |
| 187 | + }) |
| 188 | + |
| 189 | + let css = result.css.toString() |
| 190 | + |
| 191 | + cache.write(dependencies, css) |
| 192 | + |
| 193 | + console.timeEnd('compile') |
| 194 | + |
| 195 | + return css |
| 196 | + } catch (err) { |
| 197 | + console.log(preview(merged, err, { |
| 198 | + offset: 10 |
| 199 | + })) |
| 200 | + console.error(err.stack || err) |
| 201 | + |
| 202 | + err.file && ctx.dependency(err.file) |
| 203 | + throw err |
| 204 | + } |
| 205 | + } |
| 206 | + }).then(css => { |
| 207 | + callback(null, css) |
| 208 | + }, err => { |
| 209 | + callback(err) |
| 210 | + }) |
| 211 | +} |
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