/*
* Copyright 2009 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.jscomp.Normalize.NormalizeStatements;
import com.google.javascript.rhino.Node;
/**
* @author johnlenz@google.com (John Lenz)
*
*/
public class DenormalizeTest extends CompilerTestCase {
@Override
public CompilerPass getProcessor(final Compiler compiler) {
return new NormalizeAndDenormalizePass(compiler);
}
@Override
protected int getNumRepetitions() {
// The normalize pass is only run once.
return 1;
}
public void testFor() {
// Verify assignments are moved into the FOR init node.
test("a = 0; for(; a < 2 ; a++) foo()",
"for(a = 0; a < 2 ; a++) foo();");
// Verify vars are are moved into the FOR init node.
test("var a = 0; for(; c < b ; c++) foo()",
"for(var a = 0; c < b ; c++) foo()");
// We don't handle labels yet.
testSame("var a = 0; a:for(; c < b ; c++) foo()");
testSame("var a = 0; a:b:for(; c < b ; c++) foo()");
// Verify FOR inside IFs.
test("if(x){var a = 0; for(; c < b; c++) foo()}",
"if(x){for(var a = 0; c < b; c++) foo()}");
// Any other expression.
test("init(); for(; a < 2 ; a++) foo()",
"for(init(); a < 2 ; a++) foo();");
// Other statements are left as is.
test("function f(){ var a; for(; a < 2 ; a++) foo() }",
"function f(){ for(var a; a < 2 ; a++) foo() }");
testSame("function f(){ return; for(; a < 2 ; a++) foo() }");
}
public void testForIn() {
test("var a; for(a in b) foo()", "for (var a in b) foo()");
testSame("a = 0; for(a in b) foo()");
testSame("var a = 0; for(a in b) foo()");
// We don't handle labels yet.
testSame("var a; a:for(a in b) foo()");
testSame("var a; a:b:for(a in b) foo()");
// Verify FOR inside IFs.
test("if(x){var a; for(a in b) foo()}",
"if(x){for(var a in b) foo()}");
// Any other expression.
testSame("init(); for(a in b) foo()");
// Other statements are left as is.
testSame("function f(){ return; for(a in b) foo() }");
}
public void testInOperatorNotInsideFor() {
// in operators shouldn't be moved into for loops.
// Some JavaScript interpreters (such as the NetFront Access browser
// embedded in the PlayStation 3) will not parse an in operator in
// a for loop, even if it's protected by parentheses.
// Make sure the in operator doesn't get moved into the for loop.
testSame("function f(){ var a; var i=\"length\" in a;" +
"for(; a < 2 ; a++) foo() }");
// Same, but with parens around the operator.
testSame("function f(){ var a; var i=(\"length\" in a);" +
"for(; a < 2 ; a++) foo() }");
// Make sure Normalize yanks the variable initializer out, and
// Denormalize doesn't put it back.
test("function f(){" +
"var b,a=0; for (var i=(\"length\" in b);a<2; a++) foo()}",
"function f(){var b; var a=0;var i=(\"length\" in b);" +
"for (;a<2;a++) foo()}");
}
/**
* Create a class to combine the Normalize and Denormalize passes.
* This is needed because the enableNormalize() call on CompilerTestCase
* causes normalization of the result *and* the expected string, and
* we really don't want the compiler twisting the expected code around.
*/
public class NormalizeAndDenormalizePass implements CompilerPass {
Denormalize denormalizePass;
NormalizeStatements normalizePass;
AbstractCompiler compiler;
public NormalizeAndDenormalizePass(AbstractCompiler compiler) {
this.compiler = compiler;
denormalizePass = new Denormalize(compiler);
normalizePass = new NormalizeStatements(compiler, false);
}
@Override
public void process(Node externs, Node root) {
NodeTraversal.traverse(compiler, root, normalizePass);
NodeTraversal.traverse(compiler, root, denormalizePass);
}
}
}