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node_modules/autoprefixer/lib/browsers.js

@@ -0,0 +1,79 @@
+let browserslist = require('browserslist')
+let agents = require('caniuse-lite').agents
+
+let utils = require('./utils')
+
+class Browsers {
+  /**
+   * Return all prefixes for default browser data
+   */
+  static prefixes() {
+    if (this.prefixesCache) {
+      return this.prefixesCache
+    }
+
+    this.prefixesCache = []
+    for (let name in agents) {
+      this.prefixesCache.push(`-${agents[name].prefix}-`)
+    }
+
+    this.prefixesCache = utils
+      .uniq(this.prefixesCache)
+      .sort((a, b) => b.length - a.length)
+
+    return this.prefixesCache
+  }
+
+  /**
+   * Check is value contain any possible prefix
+   */
+  static withPrefix(value) {
+    if (!this.prefixesRegexp) {
+      this.prefixesRegexp = new RegExp(this.prefixes().join('|'))
+    }
+
+    return this.prefixesRegexp.test(value)
+  }
+
+  constructor(data, requirements, options, browserslistOpts) {
+    this.data = data
+    this.options = options || {}
+    this.browserslistOpts = browserslistOpts || {}
+    this.selected = this.parse(requirements)
+  }
+
+  /**
+   * Return browsers selected by requirements
+   */
+  parse(requirements) {
+    let opts = {}
+    for (let i in this.browserslistOpts) {
+      opts[i] = this.browserslistOpts[i]
+    }
+    opts.path = this.options.from
+    return browserslist(requirements, opts)
+  }
+
+  /**
+   * Return prefix for selected browser
+   */
+  prefix(browser) {
+    let [name, version] = browser.split(' ')
+    let data = this.data[name]
+
+    let prefix = data.prefix_exceptions && data.prefix_exceptions[version]
+    if (!prefix) {
+      prefix = data.prefix
+    }
+    return `-${prefix}-`
+  }
+
+  /**
+   * Is browser is selected by requirements
+   */
+  isSelected(browser) {
+    return this.selected.includes(browser)
+  }
+}
+
+module.exports = Browsers