/**
   * @fileoverview Define the cursor which iterates tokens only.
   * @author Toru Nagashima
   */
  "use strict";
  
  //------------------------------------------------------------------------------
  // Requirements
  //------------------------------------------------------------------------------
  
  const Cursor = require("./cursor");
  const utils = require("./utils");
  
  //------------------------------------------------------------------------------
  // Exports
  //------------------------------------------------------------------------------
  
  /**
   * The cursor which iterates tokens only.
   */
  module.exports = class ForwardTokenCursor extends Cursor {
  
      /**
       * Initializes this cursor.
       * @param {Token[]} tokens - The array of tokens.
       * @param {Comment[]} comments - The array of comments.
       * @param {Object} indexMap - The map from locations to indices in `tokens`.
       * @param {number} startLoc - The start location of the iteration range.
       * @param {number} endLoc - The end location of the iteration range.
       */
      constructor(tokens, comments, indexMap, startLoc, endLoc) {
          super();
          this.tokens = tokens;
          this.index = utils.getFirstIndex(tokens, indexMap, startLoc);
          this.indexEnd = utils.getLastIndex(tokens, indexMap, endLoc);
      }
  
      /** @inheritdoc */
      moveNext() {
          if (this.index <= this.indexEnd) {
              this.current = this.tokens[this.index];
              this.index += 1;
              return true;
          }
          return false;
      }
  
      //
      // Shorthand for performance.
      //
  
      /** @inheritdoc */
      getOneToken() {
          return (this.index <= this.indexEnd) ? this.tokens[this.index] : null;
      }
  
      /** @inheritdoc */
      getAllTokens() {
          return this.tokens.slice(this.index, this.indexEnd + 1);
      }
  };