prepack/lib/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);
      }
    }

    return _singletons.Functions.EvaluateStatements(ast.body, blockValue, strictCode, blockEnv, realm);
  } finally {
    // 6. Set the running execution context's LexicalEnvironment to oldEnv.
    realm.getRunningContext().lexicalEnvironment = oldEnv;
    realm.onDestroyScope(blockEnv);
  }
};

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

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