prepack/lib/debugger/server/SteppingManager.js

Execute a JS bundle, serialize global state and side effects to a snapshot that can be quickly restored.

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.SteppingManager = undefined;

var _babelTypes = require("babel-types");

var _invariant = require("./../common/invariant.js");

var _invariant2 = _interopRequireDefault(_invariant);

var _Stepper = require("./Stepper.js");

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

class SteppingManager {
  constructor(realm, keepOldSteppers) {
    this._realm = realm;
    this._steppers = [];
    this._keepOldSteppers = false;
    if (keepOldSteppers) this._keepOldSteppers = true;
  }


  processStepCommand(kind, currentNode) {
    if (kind === "in") {
      this._processStepIn(currentNode);
    } else if (kind === "over") {
      this._processStepOver(currentNode);
    }
    // TODO: implement stepOver and stepOut
  }

  _processStepIn(ast) {
    (0, _invariant2.default)(this._stepInto === undefined);
    (0, _invariant2.default)(ast.loc && ast.loc.source);
    if (!this._keepOldSteppers) {
      this._steppers = [];
    }
    this._steppers.push(new _Stepper.StepIntoStepper(ast.loc.source, ast.loc.start.line, ast.loc.start.column));
  }

  _processStepOver(ast) {
    (0, _invariant2.default)(ast.loc && ast.loc.source);
    if (!this._keepOldSteppers) {
      this._steppers = [];
    }
    this._steppers.push(new _Stepper.StepOverStepper(ast.loc.source, ast.loc.start.line, ast.loc.start.column, this._realm.contextStack.length));
  }

  getAndDeleteCompletedSteppers(ast) {
    (0, _invariant2.default)(ast.loc && ast.loc.source);
    let i = 0;
    let completedSteppers = [];
    while (i < this._steppers.length) {
      let stepper = this._steppers[i];
      if (stepper.isComplete(ast, this._realm.contextStack.length)) {
        completedSteppers.push(stepper);
        this._steppers.splice(i, 1);
      } else {
        i++;
      }
    }
    return completedSteppers;
  }
}
exports.SteppingManager = SteppingManager; /**
                                            * Copyright (c) 2017-present, Facebook, Inc.
                                            * All rights reserved.
                                            *
                                            * This source code is licensed under the BSD-style license found in the
                                            * LICENSE file in the root directory of this source tree. An additional grant
                                            * of patent rights can be found in the PATENTS file in the same directory.
                                            */
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