atom-nuclide/pkg/nuclide-reprint-js/lib/utils/buildScopes.js

A unified developer experience for web and mobile development, built as a suite of features on top of Atom to provide hackability and the support of an active community.

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

/*
 * Copyright (c) 2015-present, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the license found in the LICENSE file in
 * the root directory of this source tree.
 */

var _constantsMarkers2;

function _constantsMarkers() {
  return _constantsMarkers2 = _interopRequireDefault(require('../constants/markers'));
}

/**
 * Given an array of lines this will parse the scopes and return a mapping of
 * line number to unique scope ids. This mapping is returned in the form of an
 * array where arr[lineNumber] is the scopeID.
 */
function buildScopes(lines) {
  var scopes = [];
  var id = 0;
  var stack = [];
  for (var i = 0; i < lines.length; i++) {
    if (lines[i] === (_constantsMarkers2 || _constantsMarkers()).default.openScope) {
      stack.push(id++);
    }
    if (stack.length > 0) {
      scopes.push(stack[stack.length - 1]);
    } else {
      scopes.push(null);
    }
    // Make sure to do this after saving in the scope map. The closeScope is
    // part of it's own scope, we don't want to pop too soon.
    if (lines[i] === (_constantsMarkers2 || _constantsMarkers()).default.closeScope) {
      stack.pop();
    }
  }
  return scopes;
}

module.exports = buildScopes;