/*
* Copyright 2007 Google Inc.
*
* 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.gwt.dev.jjs.impl;
import com.google.gwt.dev.jjs.ast.CanBeFinal;
import com.google.gwt.dev.jjs.ast.Context;
import com.google.gwt.dev.jjs.ast.JClassType;
import com.google.gwt.dev.jjs.ast.JField;
import com.google.gwt.dev.jjs.ast.JInterfaceType;
import com.google.gwt.dev.jjs.ast.JMethod;
import com.google.gwt.dev.jjs.ast.JNullType;
import com.google.gwt.dev.jjs.ast.JProgram;
import com.google.gwt.dev.jjs.ast.JReferenceType;
import com.google.gwt.dev.jjs.ast.JType;
import com.google.gwt.dev.jjs.ast.js.JsniMethod;
import com.google.gwt.dev.util.TextOutput;
/**
* Generates Java source from our AST. ToStringGenerationVisitor is for
* relatively short toString() results, for easy viewing in a debugger. This
* subclass delves into the bodies of classes, interfaces, and methods to
* produce the whole source tree.
*
* The goal is not to generate the input source tree. Rather, the goal is to
* produce a set of classes that can be pasted into an enclosing class and
* compiled with a standard Java compiler. In practice, there are cases that
* require hand-editting to actually get a full compilation, due to Java's
* built-in reliance on particular built-in types.
*
* Known to be broken: Our generated String, Class, and Throwable are not
* compatable with the real ones, which breaks string literals, class literals,
* try/catch/throw, and overrides of Object methods.
*/
public class SourceGenerationVisitor extends ToStringGenerationVisitor {
public SourceGenerationVisitor(TextOutput textOutput) {
super(textOutput);
}
// @Override
public boolean visit(JClassType x, Context ctx) {
// All classes are deemed "static" so the monolithic compile results can be
// copy/pasted into a single enclosing class.
print(CHARS_STATIC);
super.visit(x, ctx);
openBlock();
for (int i = 0; i < x.fields.size(); ++i) {
JField it = (JField) x.fields.get(i);
accept(it);
newline();
newline();
}
for (int i = 0; i < x.methods.size(); ++i) {
JMethod it = (JMethod) x.methods.get(i);
if (!isEmptyInitializer(it)) {
accept(it);
newline();
newline();
}
}
closeBlock();
return false;
}
public boolean visit(JField x, Context ctx) {
super.visit(x, ctx);
if (x.constInitializer != null) {
print(" = ");
accept(x.constInitializer);
}
semi();
return false;
}
// @Override
public boolean visit(JInterfaceType x, Context ctx) {
super.visit(x, ctx);
openBlock();
for (int i = 0; i < x.fields.size(); ++i) {
JField field = (JField) x.fields.get(i);
accept(field);
newline();
newline();
}
for (int i = 0; i < x.methods.size(); ++i) {
JMethod method = (JMethod) x.methods.get(i);
accept(method);
newline();
newline();
}
closeBlock();
return false;
}
// @Override
public boolean visit(JMethod x, Context ctx) {
// special: transcribe clinit and init as if they were initializer blocks
if (isInitializer(x)) {
if (x.isStatic()) {
print(CHARS_STATIC);
}
accept(x.body);
} else {
super.visit(x, ctx);
if (x.isAbstract()) {
semi();
} else {
space();
accept(x.body);
}
}
return false;
}
// @Override
public boolean visit(JProgram x, Context ctx) {
for (int i = 0; i < x.entryMethods.size(); ++i) {
JMethod method = (JMethod) x.entryMethods.get(i);
accept(method);
newline();
newline();
}
for (int i = 0; i < x.getDeclaredTypes().size(); ++i) {
JReferenceType type = (JReferenceType) x.getDeclaredTypes().get(i);
accept(type);
newline();
newline();
}
return false;
}
// @Override
public boolean visit(JsniMethod x, Context ctx) {
super.visit(x, ctx);
space();
print(CHARS_SLASHSTAR);
String jsniCode = x.getFunc().getBody().toString();
String[] splits = jsniCode.split("\r|\n");
for (int i = 0, c = splits.length; i < c; ++i) {
if (i > 0) {
newline();
}
print(splits[i]);
}
print(CHARS_STARSLASH);
semi();
return false;
}
// @Override
protected void printMemberFinalFlag(CanBeFinal x) {
// suppress final flags
}
// @Override
protected void printTypeName(JType type) {
if (type instanceof JNullType) {
print("Object");
} else {
super.printTypeName(type);
}
}
private boolean isEmptyInitializer(JMethod x) {
return isInitializer(x) && (x.body.statements.size() == 0);
}
private boolean isInitializer(JMethod x) {
return x.getName().equals("$clinit") || x.getName().equals("$init");
}
}