babel-core/lib/babel/generation/source-map.js

Turn ES6 code into readable vanilla ES5 with source maps

"use strict";

var _interopRequireWildcard = function (obj) { return obj && obj.__esModule ? obj : { "default": obj }; };

var _interopRequire = function (obj) { return obj && obj.__esModule ? obj["default"] : obj; };

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

var sourceMap = _interopRequire(require("source-map"));

var t = _interopRequireWildcard(require("../types"));

var SourceMap = (function () {
  function SourceMap(position, opts, code) {
    _classCallCheck(this, SourceMap);

    this.position = position;
    this.opts = opts;

    if (opts.sourceMaps) {
      this.map = new sourceMap.SourceMapGenerator({
        file: opts.sourceMapName,
        sourceRoot: opts.sourceRoot
      });

      this.map.setSourceContent(opts.sourceFileName, code);
    } else {
      this.map = null;
    }
  }

  SourceMap.prototype.get = function get() {
    var map = this.map;
    if (map) {
      return map.toJSON();
    } else {
      return map;
    }
  };

  SourceMap.prototype.mark = function mark(node, type) {
    var loc = node.loc;
    if (!loc) return; // no location info

    var map = this.map;
    if (!map) return; // no source map

    if (t.isProgram(node) || t.isFile(node)) return; // illegal mapping nodes

    var position = this.position;

    var generated = {
      line: position.line,
      column: position.column
    };

    var original = loc[type];

    map.addMapping({
      source: this.opts.sourceFileName,
      generated: generated,
      original: original
    });
  };

  return SourceMap;
})();

module.exports = SourceMap;