"use strict";

exports.__esModule = true;
exports.default = void 0;

var _sourceMap = _interopRequireDefault(require("source-map"));

var _path = _interopRequireDefault(require("path"));

var _fs = _interopRequireDefault(require("fs"));

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

function fromBase64(str) {
  if (Buffer) {
    return Buffer.from(str, 'base64').toString();
  } else {
    return window.atob(str);
  }
}
/**
 * Source map information from input CSS.
 * For example, source map after Sass compiler.
 *
 * This class will automatically find source map in input CSS or in file system
 * near input file (according `from` option).
 *
 * @example
 * const root = postcss.parse(css, { from: 'a.sass.css' })
 * root.input.map //=> PreviousMap
 */


var PreviousMap =
/*#__PURE__*/
function () {
  /**
   * @param {string}         css    Input CSS source.
   * @param {processOptions} [opts] {@link Processor#process} options.
   */
  function PreviousMap(css, opts) {
    this.loadAnnotation(css);
    /**
     * Was source map inlined by data-uri to input CSS.
     *
     * @type {boolean}
     */

    this.inline = this.startWith(this.annotation, 'data:');
    var prev = opts.map ? opts.map.prev : undefined;
    var text = this.loadMap(opts.from, prev);
    if (text) this.text = text;
  }
  /**
   * Create a instance of `SourceMapGenerator` class
   * from the `source-map` library to work with source map information.
   *
   * It is lazy method, so it will create object only on first call
   * and then it will use cache.
   *
   * @return {SourceMapGenerator} Object with source map information.
   */


  var _proto = PreviousMap.prototype;

  _proto.consumer = function consumer() {
    if (!this.consumerCache) {
      this.consumerCache = new _sourceMap.default.SourceMapConsumer(this.text);
    }

    return this.consumerCache;
  }
  /**
   * Does source map contains `sourcesContent` with input source text.
   *
   * @return {boolean} Is `sourcesContent` present.
   */
  ;

  _proto.withContent = function withContent() {
    return !!(this.consumer().sourcesContent && this.consumer().sourcesContent.length > 0);
  };

  _proto.startWith = function startWith(string, start) {
    if (!string) return false;
    return string.substr(0, start.length) === start;
  };

  _proto.loadAnnotation = function loadAnnotation(css) {
    var match = css.match(/\/\*\s*# sourceMappingURL=(.*)\s*\*\//);
    if (match) this.annotation = match[1].trim();
  };

  _proto.decodeInline = function decodeInline(text) {
    var baseCharsetUri = /^data:application\/json;charset=utf-?8;base64,/;
    var baseUri = /^data:application\/json;base64,/;
    var uri = 'data:application/json,';

    if (this.startWith(text, uri)) {
      return decodeURIComponent(text.substr(uri.length));
    }

    if (baseCharsetUri.test(text) || baseUri.test(text)) {
      return fromBase64(text.substr(RegExp.lastMatch.length));
    }

    var encoding = text.match(/data:application\/json;([^,]+),/)[1];
    throw new Error('Unsupported source map encoding ' + encoding);
  };

  _proto.loadMap = function loadMap(file, prev) {
    if (prev === false) return false;

    if (prev) {
      if (typeof prev === 'string') {
        return prev;
      } else if (typeof prev === 'function') {
        var prevPath = prev(file);

        if (prevPath && _fs.default.existsSync && _fs.default.existsSync(prevPath)) {
          return _fs.default.readFileSync(prevPath, 'utf-8').toString().trim();
        } else {
          throw new Error('Unable to load previous source map: ' + prevPath.toString());
        }
      } else if (prev instanceof _sourceMap.default.SourceMapConsumer) {
        return _sourceMap.default.SourceMapGenerator.fromSourceMap(prev).toString();
      } else if (prev instanceof _sourceMap.default.SourceMapGenerator) {
        return prev.toString();
      } else if (this.isMap(prev)) {
        return JSON.stringify(prev);
      } else {
        throw new Error('Unsupported previous source map format: ' + prev.toString());
      }
    } else if (this.inline) {
      return this.decodeInline(this.annotation);
    } else if (this.annotation) {
      var map = this.annotation;
      if (file) map = _path.default.join(_path.default.dirname(file), map);
      this.root = _path.default.dirname(map);

      if (_fs.default.existsSync && _fs.default.existsSync(map)) {
        return _fs.default.readFileSync(map, 'utf-8').toString().trim();
      } else {
        return false;
      }
    }
  };

  _proto.isMap = function isMap(map) {
    if (typeof map !== 'object') return false;
    return typeof map.mappings === 'string' || typeof map._mappings === 'string';
  };

  return PreviousMap;
}();

var _default = PreviousMap;
exports.default = _default;
module.exports = exports.default;
//# sourceMappingURL=data:application/json;charset=utf8;base64,[encoded data, 11172 characters]
