136 lines
30 KiB
JavaScript
136 lines
30 KiB
JavaScript
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(function() {
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var escope, expect, harmony;
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expect = require('chai').expect;
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harmony = require('../third_party/esprima');
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escope = require('..');
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describe('ES6 block scope', function() {
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it('let is materialized in ES6 block scope#1', function() {
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var ast, scope, scopeManager;
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ast = harmony.parse("{\n let i = 20;\n i;\n}");
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scopeManager = escope.analyze(ast, {
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ecmaVersion: 6
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});
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expect(scopeManager.scopes).to.have.length(2);
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scope = scopeManager.scopes[0];
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expect(scope.type).to.be.equal('global');
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expect(scope.variables).to.have.length(0);
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scope = scopeManager.scopes[1];
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expect(scope.type).to.be.equal('block');
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expect(scope.variables).to.have.length(1);
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expect(scope.variables[0].name).to.be.equal('i');
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expect(scope.references).to.have.length(2);
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expect(scope.references[0].identifier.name).to.be.equal('i');
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return expect(scope.references[1].identifier.name).to.be.equal('i');
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});
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it('let is materialized in ES6 block scope#2', function() {
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var ast, scope, scopeManager;
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ast = harmony.parse("{\n let i = 20;\n var i = 20;\n i;\n}");
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scopeManager = escope.analyze(ast, {
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ecmaVersion: 6
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});
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expect(scopeManager.scopes).to.have.length(2);
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scope = scopeManager.scopes[0];
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expect(scope.type).to.be.equal('global');
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expect(scope.variables).to.have.length(1);
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expect(scope.variables[0].name).to.be.equal('i');
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scope = scopeManager.scopes[1];
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expect(scope.type).to.be.equal('block');
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expect(scope.variables).to.have.length(1);
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expect(scope.variables[0].name).to.be.equal('i');
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expect(scope.references).to.have.length(3);
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expect(scope.references[0].identifier.name).to.be.equal('i');
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expect(scope.references[1].identifier.name).to.be.equal('i');
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return expect(scope.references[2].identifier.name).to.be.equal('i');
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});
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it('function delaration is materialized in ES6 block scope', function() {
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var ast, scope, scopeManager;
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ast = harmony.parse("{\n function test() {\n }\n test();\n}");
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scopeManager = escope.analyze(ast, {
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ecmaVersion: 6
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});
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expect(scopeManager.scopes).to.have.length(3);
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scope = scopeManager.scopes[0];
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expect(scope.type).to.be.equal('global');
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expect(scope.variables).to.have.length(0);
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scope = scopeManager.scopes[1];
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expect(scope.type).to.be.equal('block');
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expect(scope.variables).to.have.length(1);
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expect(scope.variables[0].name).to.be.equal('test');
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expect(scope.references).to.have.length(1);
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expect(scope.references[0].identifier.name).to.be.equal('test');
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scope = scopeManager.scopes[2];
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expect(scope.type).to.be.equal('function');
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expect(scope.variables).to.have.length(1);
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expect(scope.variables[0].name).to.be.equal('arguments');
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return expect(scope.references).to.have.length(0);
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});
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it('let is not hoistable#1', function() {
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var ast, globalScope, scope, scopeManager;
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ast = harmony.parse("var i = 42; (1)\n{\n i; // (2) ReferenceError at runtime.\n let i = 20; // (2)\n i; // (2)\n}");
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scopeManager = escope.analyze(ast, {
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ecmaVersion: 6
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});
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expect(scopeManager.scopes).to.have.length(2);
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globalScope = scopeManager.scopes[0];
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expect(globalScope.type).to.be.equal('global');
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expect(globalScope.variables).to.have.length(1);
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expect(globalScope.variables[0].name).to.be.equal('i');
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expect(globalScope.references).to.have.length(1);
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scope = scopeManager.scopes[1];
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expect(scope.type).to.be.equal('block');
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expect(scope.variables).to.have.length(1);
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expect(scope.variables[0].name).to.be.equal('i');
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expect(scope.references).to.have.length(3);
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expect(scope.references[0].resolved).to.be.equal(scope.variables[0]);
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expect(scope.references[1].resolved).to.be.equal(scope.variables[0]);
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return expect(scope.references[2].resolved).to.be.equal(scope.variables[0]);
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});
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return it('let is not hoistable#2', function() {
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var ast, globalScope, scope, scopeManager, v1, v2, v3;
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ast = harmony.parse("(function () {\n var i = 42; // (1)\n i; // (1)\n {\n i; // (3)\n {\n i; // (2)\n let i = 20; // (2)\n i; // (2)\n }\n let i = 30; // (3)\n i; // (3)\n }\n i; // (1)\n}());");
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scopeManager = escope.analyze(ast, {
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ecmaVersion: 6
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});
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expect(scopeManager.scopes).to.have.length(4);
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globalScope = scopeManager.scopes[0];
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expect(globalScope.type).to.be.equal('global');
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expect(globalScope.variables).to.have.length(0);
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expect(globalScope.references).to.have.length(0);
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scope = scopeManager.scopes[1];
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expect(scope.type).to.be.equal('function');
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expect(scope.variables).to.have.length(2);
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expect(scope.variables[0].name).to.be.equal('arguments');
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expect(scope.variables[1].name).to.be.equal('i');
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v1 = scope.variables[1];
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expect(scope.references).to.have.length(3);
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expect(scope.references[0].resolved).to.be.equal(v1);
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expect(scope.references[1].resolved).to.be.equal(v1);
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expect(scope.references[2].resolved).to.be.equal(v1);
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scope = scopeManager.scopes[2];
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expect(scope.type).to.be.equal('block');
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expect(scope.variables).to.have.length(1);
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expect(scope.variables[0].name).to.be.equal('i');
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v3 = scope.variables[0];
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expect(scope.references).to.have.length(3);
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expect(scope.references[0].resolved).to.be.equal(v3);
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expect(scope.references[1].resolved).to.be.equal(v3);
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expect(scope.references[2].resolved).to.be.equal(v3);
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scope = scopeManager.scopes[3];
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expect(scope.type).to.be.equal('block');
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expect(scope.variables).to.have.length(1);
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expect(scope.variables[0].name).to.be.equal('i');
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v2 = scope.variables[0];
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expect(scope.references).to.have.length(3);
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expect(scope.references[0].resolved).to.be.equal(v2);
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expect(scope.references[1].resolved).to.be.equal(v2);
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return expect(scope.references[2].resolved).to.be.equal(v2);
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});
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});
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}).call(this);
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