'use strict';

exports.__esModule = true;

var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol" ? function (obj) { return typeof obj; } : function (obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; };

var _lazyResult = require('./lazy-result');

var _lazyResult2 = _interopRequireDefault(_lazyResult);

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

/**
 * Contains plugins to process CSS. Create one `Processor` instance,
 * initialize its plugins, and then use that instance on numerous CSS files.
 *
 * @example
 * const processor = postcss([autoprefixer, precss]);
 * processor.process(css1).then(result => console.log(result.css));
 * processor.process(css2).then(result => console.log(result.css));
 */
var Processor = function () {

  /**
   * @param {Array.<Plugin|pluginFunction>|Processor} plugins - PostCSS
   *        plugins. See {@link Processor#use} for plugin format.
   */
  function Processor() {
    var plugins = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : [];

    _classCallCheck(this, Processor);

    /**
     * @member {string} - Current PostCSS version.
     *
     * @example
     * if ( result.processor.version.split('.')[0] !== '6' ) {
     *   throw new Error('This plugin works only with PostCSS 6');
     * }
     */
    this.version = '6.0.13';
    /**
     * @member {pluginFunction[]} - Plugins added to this processor.
     *
     * @example
     * const processor = postcss([autoprefixer, precss]);
     * processor.plugins.length //=> 2
     */
    this.plugins = this.normalize(plugins);
  }

  /**
   * Adds a plugin to be used as a CSS processor.
   *
   * PostCSS plugin can be in 4 formats:
   * * A plugin created by {@link postcss.plugin} method.
   * * A function. PostCSS will pass the function a @{link Root}
   *   as the first argument and current {@link Result} instance
   *   as the second.
   * * An object with a `postcss` method. PostCSS will use that method
   *   as described in #2.
   * * Another {@link Processor} instance. PostCSS will copy plugins
   *   from that instance into this one.
   *
   * Plugins can also be added by passing them as arguments when creating
   * a `postcss` instance (see [`postcss(plugins)`]).
   *
   * Asynchronous plugins should return a `Promise` instance.
   *
   * @param {Plugin|pluginFunction|Processor} plugin - PostCSS plugin
   *                                                   or {@link Processor}
   *                                                   with plugins
   *
   * @example
   * const processor = postcss()
   *   .use(autoprefixer)
   *   .use(precss);
   *
   * @return {Processes} current processor to make methods chain
   */


  Processor.prototype.use = function use(plugin) {
    this.plugins = this.plugins.concat(this.normalize([plugin]));
    return this;
  };

  /**
   * Parses source CSS and returns a {@link LazyResult} Promise proxy.
   * Because some plugins can be asynchronous it doesn’t make
   * any transformations. Transformations will be applied
   * in the {@link LazyResult} methods.
   *
   * @param {string|toString|Result} css - String with input CSS or
   *                                       any object with a `toString()`
   *                                       method, like a Buffer.
   *                                       Optionally, send a {@link Result}
   *                                       instance and the processor will
   *                                       take the {@link Root} from it.
   * @param {processOptions} [opts]      - options
   *
   * @return {LazyResult} Promise proxy
   *
   * @example
   * processor.process(css, { from: 'a.css', to: 'a.out.css' })
   *   .then(result => {
   *      console.log(result.css);
   *   });
   */


  Processor.prototype.process = function process(css) {
    var opts = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};

    return new _lazyResult2.default(this, css, opts);
  };

  Processor.prototype.normalize = function normalize(plugins) {
    var normalized = [];
    for (var _iterator = plugins, _isArray = Array.isArray(_iterator), _i = 0, _iterator = _isArray ? _iterator : _iterator[Symbol.iterator]();;) {
      var _ref;

      if (_isArray) {
        if (_i >= _iterator.length) break;
        _ref = _iterator[_i++];
      } else {
        _i = _iterator.next();
        if (_i.done) break;
        _ref = _i.value;
      }

      var i = _ref;

      if (i.postcss) i = i.postcss;

      if ((typeof i === 'undefined' ? 'undefined' : _typeof(i)) === 'object' && Array.isArray(i.plugins)) {
        normalized = normalized.concat(i.plugins);
      } else if (typeof i === 'function') {
        normalized.push(i);
      } else if ((typeof i === 'undefined' ? 'undefined' : _typeof(i)) === 'object' && (i.parse || i.stringify)) {
        throw new Error('PostCSS syntaxes cannot be used as plugins. ' + 'Instead, please use one of the ' + 'syntax/parser/stringifier options as ' + 'outlined in your PostCSS ' + 'runner documentation.');
      } else {
        throw new Error(i + ' is not a PostCSS plugin');
      }
    }
    return normalized;
  };

  return Processor;
}();

exports.default = Processor;

/**
 * @callback builder
 * @param {string} part          - part of generated CSS connected to this node
 * @param {Node}   node          - AST node
 * @param {"start"|"end"} [type] - node’s part type
 */

/**
 * @callback parser
 *
 * @param {string|toString} css   - string with input CSS or any object
 *                                  with toString() method, like a Buffer
 * @param {processOptions} [opts] - options with only `from` and `map` keys
 *
 * @return {Root} PostCSS AST
 */

/**
 * @callback stringifier
 *
 * @param {Node} node       - start node for stringifing. Usually {@link Root}.
 * @param {builder} builder - function to concatenate CSS from node’s parts
 *                            or generate string and source map
 *
 * @return {void}
 */

/**
 * @typedef {object} syntax
 * @property {parser} parse          - function to generate AST by string
 * @property {stringifier} stringify - function to generate string by AST
 */

/**
 * @typedef {object} toString
 * @property {function} toString
 */

/**
 * @callback pluginFunction
 * @param {Root} root     - parsed input CSS
 * @param {Result} result - result to set warnings or check other plugins
 */

/**
 * @typedef {object} Plugin
 * @property {function} postcss - PostCSS plugin function
 */

/**
 * @typedef {object} processOptions
 * @property {string} from             - the path of the CSS source file.
 *                                       You should always set `from`,
 *                                       because it is used in source map
 *                                       generation and syntax error messages.
 * @property {string} to               - the path where you’ll put the output
 *                                       CSS file. You should always set `to`
 *                                       to generate correct source maps.
 * @property {parser} parser           - function to generate AST by string
 * @property {stringifier} stringifier - class to generate string by AST
 * @property {syntax} syntax           - object with `parse` and `stringify`
 * @property {object} map              - source map options
 * @property {boolean} map.inline                    - does source map should
 *                                                     be embedded in the output
 *                                                     CSS as a base64-encoded
 *                                                     comment
 * @property {string|object|false|function} map.prev - source map content
 *                                                     from a previous
 *                                                     processing step
 *                                                     (for example, Sass).
 *                                                     PostCSS will try to find
 *                                                     previous map
 *                                                     automatically, so you
 *                                                     could disable it by
 *                                                     `false` value.
 * @property {boolean} map.sourcesContent            - does PostCSS should set
 *                                                     the origin content to map
 * @property {string|false} map.annotation           - does PostCSS should set
 *                                                     annotation comment to map
 * @property {string} map.from                       - override `from` in map’s
 *                                                     `sources`
 */

module.exports = exports['default'];
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