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/*
 * Copyright (C) 2012-2014 by various contributors (see AUTHORS)
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
*/

import { reservedWords } from "../util/identifier";
import { getOptions } from "../options";
import Tokenizer from "../tokenizer";

export const plugins = {};

export default class Parser extends Tokenizer {
  constructor(options, input) {
    options = getOptions(options);
    super(options, input);

    this.options = options;
    this.inModule = this.options.sourceType === "module";
    this.input = input;
    this.plugins = this.loadPlugins(this.options.plugins);
    this.filename = options.sourceFilename;

    // If enabled, skip leading hashbang line.
    if (this.state.pos === 0 && this.input[0] === "#" && this.input[1] === "!") {
      this.skipLineComment(2);
    }
  }

  isReservedWord(word) {
    if (word === "await") {
      return this.inModule;
    } else {
      return reservedWords[6](word);
    }
  }

  hasPlugin(name) {
    return !!this.plugins[name];
  }

  extend(name, f) {
    this[name] = f(this[name]);
  }

  loadPlugins(pluginList) {
    const pluginMap = {};

    if (pluginList.indexOf("flow") >= 0) {
      // ensure flow plugin loads last
      pluginList = pluginList.filter((plugin) => plugin !== "flow");
      pluginList.push("flow");
    }

    if (pluginList.indexOf("estree") >= 0) {
      // ensure estree plugin loads first
      pluginList = pluginList.filter((plugin) => plugin !== "estree");
      pluginList.unshift("estree");
    }

    for (const name of pluginList) {
      if (!pluginMap[name]) {
        pluginMap[name] = true;

        const plugin = plugins[name];
        if (plugin) plugin(this);
      }
    }

    return pluginMap;
  }

  parse() {
    const file = this.startNode();
    const program = this.startNode();
    this.nextToken();
    return this.parseTopLevel(file, program);
  }
}