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/*
* 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;
/**
* Tests for {@link FunctionRewriter}
*
*/
public class FunctionRewriterTest extends CompilerTestCase {
private static final String RETURNARG_HELPER =
"function JSCompiler_returnArg(JSCompiler_returnArg_value){" +
" return function() { return JSCompiler_returnArg_value }" +
"}";
private static final String GET_HELPER =
"function JSCompiler_get(JSCompiler_get_name){" +
" return function() { return this[JSCompiler_get_name] }" +
"}";
private static final String SET_HELPER =
"function JSCompiler_set(JSCompiler_set_name) {" +
" return function(JSCompiler_set_value){" +
" this[JSCompiler_set_name]=JSCompiler_set_value" +
" }" +
"}";
private static final String EMPTY_HELPER =
"function JSCompiler_emptyFn() {" +
" return function(){}" +
"}";
private static final String IDENTITY_HELPER =
"function JSCompiler_identityFn() {" +
" return function(JSCompiler_identityFn_value) {" +
" return JSCompiler_identityFn_value" +
" }" +
"}";
@Override
protected void setUp() {
super.enableLineNumberCheck(false);
}
@Override
protected FunctionRewriter getProcessor(Compiler compiler) {
return new FunctionRewriter(compiler);
}
@Override
protected int getNumRepetitions() {
// Pass reaches steady state after just 1 iteration
return 1;
}
public void testReplaceReturnConst1() {
String source = "a.prototype.foo = function() {return \"foobar\"}";
checkCompilesToSame(source, 3);
checkCompilesTo(source,
RETURNARG_HELPER,
"a.prototype.foo = JSCompiler_returnArg(\"foobar\")",
4);
}
public void testReplaceReturnConst2() {
checkCompilesToSame("a.prototype.foo = function() {return foobar}", 10);
}
public void testReplaceReturnConst3() {
String source = "a.prototype.foo = function() {return void 0;}";
checkCompilesToSame(source, 3);
checkCompilesTo(source,
RETURNARG_HELPER,
"a.prototype.foo = JSCompiler_returnArg(void 0)",
4);
}
public void testReplaceGetter1() {
String source = "a.prototype.foo = function() {return this.foo_}";
checkCompilesToSame(source, 3);
checkCompilesTo(source,
GET_HELPER,
"a.prototype.foo = JSCompiler_get(\"foo_\")",
4);
}
public void testReplaceGetter2() {
checkCompilesToSame("a.prototype.foo = function() {return}", 10);
}
public void testReplaceSetter1() {
String source = "a.prototype.foo = function(v) {this.foo_ = v}";
checkCompilesToSame(source, 4);
checkCompilesTo(source,
SET_HELPER,
"a.prototype.foo = JSCompiler_set(\"foo_\")",
5);
}
public void testReplaceSetter2() {
String source = "a.prototype.foo = function(v, v2) {this.foo_ = v}";
checkCompilesToSame(source, 3);
checkCompilesTo(source,
SET_HELPER,
"a.prototype.foo = JSCompiler_set(\"foo_\")",
4);
}
public void testReplaceSetter3() {
checkCompilesToSame("a.prototype.foo = function() {this.foo_ = v}", 10);
}
public void testReplaceSetter4() {
checkCompilesToSame(
"a.prototype.foo = function(v, v2) {this.foo_ = v2}", 10);
}
public void testReplaceEmptyFunction1() {
String source = "a.prototype.foo = function() {}";
checkCompilesToSame(source, 4);
checkCompilesTo(source,
EMPTY_HELPER,
"a.prototype.foo = JSCompiler_emptyFn()",
5);
}
public void testReplaceEmptyFunction2() {
checkCompilesToSame("function foo() {}", 10);
}
public void testReplaceEmptyFunction3() {
String source = "var foo = function() {}";
checkCompilesToSame(source, 4);
checkCompilesTo(source,
EMPTY_HELPER,
"var foo = JSCompiler_emptyFn()",
5);
}
public void testReplaceIdentityFunction1() {
String source = "a.prototype.foo = function(a) {return a}";
checkCompilesToSame(source, 2);
checkCompilesTo(source,
IDENTITY_HELPER,
"a.prototype.foo = JSCompiler_identityFn()",
3);
}
public void testReplaceIdentityFunction2() {
checkCompilesToSame("a.prototype.foo = function(a) {return a + 1}", 10);
}
public void testIssue538() {
checkCompilesToSame( "/** @constructor */\n" +
"WebInspector.Setting = function() {}\n" +
"WebInspector.Setting.prototype = {\n" +
" get name0(){return this._name;},\n" +
" get name1(){return this._name;},\n" +
" get name2(){return this._name;},\n" +
" get name3(){return this._name;},\n" +
" get name4(){return this._name;},\n" +
" get name5(){return this._name;},\n" +
" get name6(){return this._name;},\n" +
" get name7(){return this._name;},\n" +
" get name8(){return this._name;},\n" +
" get name9(){return this._name;},\n" +
"}", 1);
}
private void checkCompilesTo(String src,
String expectedHdr,
String expectedBody,
int repetitions) {
StringBuilder srcBuffer = new StringBuilder();
StringBuilder expectedBuffer = new StringBuilder();
expectedBuffer.append(expectedHdr);
for (int idx = 0; idx < repetitions; idx++) {
if (idx != 0) {
srcBuffer.append(";");
expectedBuffer.append(";");
}
srcBuffer.append(src);
expectedBuffer.append(expectedBody);
}
test(srcBuffer.toString(), expectedBuffer.toString());
}
private void checkCompilesToSame(String src, int repetitions) {
checkCompilesTo(src, "", src, repetitions);
}
}
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