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