prepack/lib/partial-evaluators/BlockStatement.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.default = function (ast, strictCode, env, realm) {
  // 1. Let oldEnv be the running execution context's LexicalEnvironment.
  let oldEnv = realm.getRunningContext().lexicalEnvironment;

  // 2. Let blockEnv be NewDeclarativeEnvironment(oldEnv).
  let blockEnv = _singletons.Environment.NewDeclarativeEnvironment(realm, oldEnv);

  // 3. Perform BlockDeclarationInstantiation(StatementList, blockEnv).
  _singletons.Environment.BlockDeclarationInstantiation(realm, strictCode, ast.body, blockEnv);

  // 4. Set the running execution context's LexicalEnvironment to blockEnv.
  realm.getRunningContext().lexicalEnvironment = blockEnv;

  try {
    // 5. Let blockValue be the result of evaluating StatementList.
    let blockValue;

    if (ast.directives) {
      for (let directive of ast.directives) {
        blockValue = new _index.StringValue(realm, directive.value.value);
      }
    }

    let [res, bAst] = _singletons.Functions.PartiallyEvaluateStatements(ast.body, blockValue, strictCode, blockEnv, realm);
    (0, _invariant2.default)(bAst.length > 0 || res instanceof _index.EmptyValue);
    if (bAst.length === 0) return [res, t.emptyStatement(), []];
    let rAst = t.blockStatement(bAst, ast.directives);
    return [res, rAst, []];
  } finally {
    // 6. Set the running execution context's LexicalEnvironment to oldEnv.
    realm.getRunningContext().lexicalEnvironment = oldEnv;
    realm.onDestroyScope(blockEnv);
  }
};

var _completions = require("../completions.js");

var _index = require("../values/index.js");

var _singletons = require("../singletons.js");

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

var _invariant2 = _interopRequireDefault(_invariant);

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

var t = _interopRequireWildcard(_babelTypes);

function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } else { var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) newObj[key] = obj[key]; } } newObj.default = obj; return newObj; } }

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