142 lines
4.5 KiB
Java
142 lines
4.5 KiB
Java
/*
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* Copyright 2007 The Closure Compiler Authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.google.javascript.jscomp;
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import com.google.javascript.rhino.Node;
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import com.google.javascript.rhino.Token;
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import junit.framework.TestCase;
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/**
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* Tests for {@link SyntacticScopeCreator}.
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*
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*/
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public class SyntacticScopeCreatorTest extends TestCase {
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/**
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* Helper to create a top-level scope from a JavaScript string
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*/
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private static Scope getScope(String js) {
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Compiler compiler = new Compiler();
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Node root = compiler.parseTestCode(js);
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assertEquals(0, compiler.getErrorCount());
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Scope scope =
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new SyntacticScopeCreator(compiler).createScope(root, null);
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return scope;
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}
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/**
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* Helper to traverse the tree creating the Scope object everywhere.
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*/
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private static void testScopes(String js, int errorCount) {
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Compiler compiler = new Compiler();
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Node root = compiler.parseTestCode(js);
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NodeTraversal.traverse(
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compiler, root, new NodeTraversal.AbstractPostOrderCallback() {
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@Override
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public
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void visit(NodeTraversal t, Node n, Node parent) {
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t.getScope();
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}
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});
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assertEquals(errorCount, compiler.getErrorCount());
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}
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public void testFunctionScope() {
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Scope scope = getScope("function foo() {}\n" +
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"var x = function bar(a1) {};" +
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"[function bar2() { var y; }];" +
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"if (true) { function z() {} }"
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);
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assertTrue(scope.isDeclared("foo", false));
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assertTrue(scope.isDeclared("x", false));
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assertTrue(scope.isDeclared("z", false));
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// The following should not be declared in this scope
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assertFalse(scope.isDeclared("a1", false));
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assertFalse(scope.isDeclared("bar", false));
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assertFalse(scope.isDeclared("bar2", false));
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assertFalse(scope.isDeclared("y", false));
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assertFalse(scope.isDeclared("", false));
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}
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public void testScopeRootNode() {
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String js = "function foo() {\n" +
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" var x = 10;" +
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"}";
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Compiler compiler = new Compiler();
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Node root = compiler.parseTestCode(js);
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assertEquals(0, compiler.getErrorCount());
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Scope globalScope =
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new SyntacticScopeCreator(compiler).createScope(root, null);
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assertEquals(root, globalScope.getRootNode());
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Node fooNode = root.getFirstChild();
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assertEquals(Token.FUNCTION, fooNode.getType());
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Scope fooScope =
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new SyntacticScopeCreator(compiler).createScope(fooNode, null);
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assertEquals(fooNode, fooScope.getRootNode());
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assertTrue(fooScope.isDeclared("x", false));
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}
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public void testRedeclaration1() {
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String js = "var a; var a;";
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int errors = createGlobalScopeHelper(js);
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assertEquals(1, errors);
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}
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public void testRedeclaration2() {
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String js = "var a; /** @suppress {duplicate} */ var a;";
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int errors = createGlobalScopeHelper(js);
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assertEquals(0, errors);
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}
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public void testRedeclaration3() {
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String js = " /** @suppress {duplicate} */ var a; var a; ";
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int errors = createGlobalScopeHelper(js);
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assertEquals(0, errors);
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}
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public void testFunctionScopeArguments() {
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// A var declaration doesn't mask arguments
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testScopes("function f() {var arguments}", 0);
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testScopes("var f = function arguments() {}", 1);
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testScopes("var f = function (arguments) {}", 1);
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testScopes("function f() {try {} catch(arguments) {}}", 1);
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}
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/**
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* Parse the supplied JS and create the global SyntaticScope object.
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* @return The error count.
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*/
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private int createGlobalScopeHelper(String js) {
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Compiler compiler = new Compiler();
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CompilerOptions options = new CompilerOptions();
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options.checkSymbols = true;
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compiler.initOptions(options);
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Node root = compiler.parseTestCode(js);
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assertEquals(0, compiler.getErrorCount());
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Scope globalScope =
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new SyntacticScopeCreator(compiler).createScope(root, null);
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assertEquals(root, globalScope.getRootNode());
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return compiler.getErrorCount();
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}
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}
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