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The AspectJ weaver introduces advices to java classes
/* *******************************************************************
* Copyright (c) 2005-2008 Contributors.
* All rights reserved.
* This program and the accompanying materials are made available
* under the terms of the Eclipse Public License v1.0
* which accompanies this distribution and is available at
* http://eclipse.org/legal/epl-v10.html
*
* ******************************************************************/
package org.aspectj.util;
import java.util.ArrayList;
import java.util.List;
import org.aspectj.util.GenericSignature.ArrayTypeSignature;
import org.aspectj.util.GenericSignature.BaseTypeSignature;
import org.aspectj.util.GenericSignature.ClassTypeSignature;
import org.aspectj.util.GenericSignature.FieldTypeSignature;
import org.aspectj.util.GenericSignature.FormalTypeParameter;
import org.aspectj.util.GenericSignature.MethodTypeSignature;
import org.aspectj.util.GenericSignature.SimpleClassTypeSignature;
import org.aspectj.util.GenericSignature.TypeArgument;
import org.aspectj.util.GenericSignature.TypeSignature;
import org.aspectj.util.GenericSignature.TypeVariableSignature;
/**
* Parses the generic signature attribute as defined in the JVM spec.
*
* @author Adrian Colyer
* @author Andy Clement
*/
public class GenericSignatureParser {
private String inputString;
private String[] tokenStream; // for parse in flight
private int tokenIndex = 0;
/**
* AMC. Parse the signature string interpreting it as a ClassSignature according to the grammar defined in Section 4.4.4 of the
* JVM specification.
*/
public GenericSignature.ClassSignature parseAsClassSignature(String sig) {
this.inputString = sig;
tokenStream = tokenize(sig);
tokenIndex = 0;
GenericSignature.ClassSignature classSig = new GenericSignature.ClassSignature();
// FormalTypeParameters-opt
if (maybeEat("<")) {
List formalTypeParametersList = new ArrayList();
do {
formalTypeParametersList.add(parseFormalTypeParameter());
} while (!maybeEat(">"));
classSig.formalTypeParameters = new FormalTypeParameter[formalTypeParametersList.size()];
formalTypeParametersList.toArray(classSig.formalTypeParameters);
}
classSig.superclassSignature = parseClassTypeSignature();
List superIntSigs = new ArrayList();
while (tokenIndex < tokenStream.length) {
superIntSigs.add(parseClassTypeSignature());
}
classSig.superInterfaceSignatures = new ClassTypeSignature[superIntSigs.size()];
superIntSigs.toArray(classSig.superInterfaceSignatures);
return classSig;
}
/**
* AMC. Parse the signature string interpreting it as a MethodTypeSignature according to the grammar defined in Section 4.4.4 of
* the JVM specification.
*/
public MethodTypeSignature parseAsMethodSignature(String sig) {
this.inputString = sig;
tokenStream = tokenize(sig);
tokenIndex = 0;
FormalTypeParameter[] formals = new FormalTypeParameter[0];
TypeSignature returnType = null;
// FormalTypeParameters-opt
if (maybeEat("<")) {
List formalTypeParametersList = new ArrayList();
do {
formalTypeParametersList.add(parseFormalTypeParameter());
} while (!maybeEat(">"));
formals = new FormalTypeParameter[formalTypeParametersList.size()];
formalTypeParametersList.toArray(formals);
}
// Parameters
eat("(");
List paramList = new ArrayList();
while (!maybeEat(")")) {
FieldTypeSignature fsig = parseFieldTypeSignature(true);
if (fsig != null) {
paramList.add(fsig);
} else {
paramList.add(new GenericSignature.BaseTypeSignature(eatIdentifier()));
}
}
TypeSignature[] params = new TypeSignature[paramList.size()];
paramList.toArray(params);
// return type
returnType = parseFieldTypeSignature(true);
if (returnType == null)
returnType = new GenericSignature.BaseTypeSignature(eatIdentifier());
// throws
List throwsList = new ArrayList();
while (maybeEat("^")) {
FieldTypeSignature fsig = parseFieldTypeSignature(false);
throwsList.add(fsig);
}
FieldTypeSignature[] throwsSigs = new FieldTypeSignature[throwsList.size()];
throwsList.toArray(throwsSigs);
return new GenericSignature.MethodTypeSignature(formals, params, returnType, throwsSigs);
}
/**
* AMC. Parse the signature string interpreting it as a FieldTypeSignature according to the grammar defined in Section 4.4.4 of
* the JVM specification.
*/
public FieldTypeSignature parseAsFieldSignature(String sig) {
this.inputString = sig;
tokenStream = tokenize(sig);
tokenIndex = 0;
return parseFieldTypeSignature(false);
}
private FormalTypeParameter parseFormalTypeParameter() {
FormalTypeParameter ftp = new FormalTypeParameter();
// Identifier
ftp.identifier = eatIdentifier();
// ClassBound
eat(":");
ftp.classBound = parseFieldTypeSignature(true);
if (ftp.classBound == null) {
ftp.classBound = new ClassTypeSignature("Ljava/lang/Object;", "Ljava/lang/Object");
}
// Optional InterfaceBounds
List optionalBounds = new ArrayList();
while (maybeEat(":")) {
optionalBounds.add(parseFieldTypeSignature(false));
}
ftp.interfaceBounds = new FieldTypeSignature[optionalBounds.size()];
optionalBounds.toArray(ftp.interfaceBounds);
return ftp;
}
private FieldTypeSignature parseFieldTypeSignature(boolean isOptional) {
if (isOptional) {
// anything other than 'L', 'T' or '[' and we're out of here
if (!tokenStream[tokenIndex].startsWith("L") && !tokenStream[tokenIndex].startsWith("T")
&& !tokenStream[tokenIndex].startsWith("[")) {
return null;
}
}
if (maybeEat("[")) {
return parseArrayTypeSignature();
} else if (tokenStream[tokenIndex].startsWith("L")) {
return parseClassTypeSignature();
} else if (tokenStream[tokenIndex].startsWith("T")) {
return parseTypeVariableSignature();
} else {
throw new IllegalStateException("Expecting [,L, or T, but found " + tokenStream[tokenIndex] + " while unpacking "
+ inputString);
}
}
private ArrayTypeSignature parseArrayTypeSignature() {
// opening [ already eaten
FieldTypeSignature fieldType = parseFieldTypeSignature(true);
if (fieldType != null) {
return new ArrayTypeSignature(fieldType);
} else {
// must be BaseType array
return new ArrayTypeSignature(new BaseTypeSignature(eatIdentifier()));
}
}
// L PackageSpecifier* SimpleClassTypeSignature ClassTypeSignature* ;
private ClassTypeSignature parseClassTypeSignature() {
SimpleClassTypeSignature outerType = null;
SimpleClassTypeSignature[] nestedTypes = new SimpleClassTypeSignature[0];
StringBuffer ret = new StringBuffer();
String identifier = eatIdentifier();
ret.append(identifier);
while (maybeEat("/")) {
ret.append("/"); // dont forget this...
ret.append(eatIdentifier());
}
identifier = ret.toString();
// now we have either a "." indicating the start of a nested type,
// or a "<" indication type arguments, or ";" and we are done.
while (!maybeEat(";")) {
if (tokenStream[tokenIndex].equals(".")) {
// outer type completed
outerType = new SimpleClassTypeSignature(identifier);
nestedTypes = parseNestedTypesHelper(ret);
} else if (tokenStream[tokenIndex].equals("<")) {
ret.append("<");
TypeArgument[] tArgs = maybeParseTypeArguments();
for (int i = 0; i < tArgs.length; i++) {
ret.append(tArgs[i].toString());
}
ret.append(">");
outerType = new SimpleClassTypeSignature(identifier, tArgs);
nestedTypes = parseNestedTypesHelper(ret);
} else {
throw new IllegalStateException("Expecting .,<, or ;, but found " + tokenStream[tokenIndex] + " while unpacking "
+ inputString);
}
}
ret.append(";");
if (outerType == null)
outerType = new SimpleClassTypeSignature(ret.toString());
return new ClassTypeSignature(ret.toString(), outerType, nestedTypes);
}
/**
* Helper method to digest nested types, slightly more complex than necessary to cope with some android related
* incorrect classes (see bug 406167)
*/
private SimpleClassTypeSignature[] parseNestedTypesHelper(StringBuffer ret) {
boolean brokenSignature = false;
SimpleClassTypeSignature[] nestedTypes;
List nestedTypeList = new ArrayList();
while (maybeEat(".")) {
ret.append(".");
SimpleClassTypeSignature sig = parseSimpleClassTypeSignature();
if (tokenStream[tokenIndex].equals("/")) {
if (!brokenSignature) {
System.err.println("[See bug 406167] Bad class file signature encountered, nested types appear package qualified, ignoring those incorrect pieces. Signature: "+inputString);
}
brokenSignature = true;
// hit something like: Lcom/a/a/b/t.com/a/a/b/af.com/a/a/b/ag;
// and we are looking at the '/' after the com
tokenIndex++; // pointing at the next identifier
while (tokenStream[tokenIndex+1].equals("/")) {
tokenIndex+=2; // jump over an 'identifier' '/' pair
}
// now tokenIndex is the final bit of the name (which we'll treat as the inner type name)
sig = parseSimpleClassTypeSignature();
}
ret.append(sig.toString());
nestedTypeList.add(sig);
};
nestedTypes = new SimpleClassTypeSignature[nestedTypeList.size()];
nestedTypeList.toArray(nestedTypes);
return nestedTypes;
}
private SimpleClassTypeSignature parseSimpleClassTypeSignature() {
String identifier = eatIdentifier();
TypeArgument[] tArgs = maybeParseTypeArguments();
if (tArgs != null) {
return new SimpleClassTypeSignature(identifier, tArgs);
} else {
return new SimpleClassTypeSignature(identifier);
}
}
private TypeArgument parseTypeArgument() {
boolean isPlus = false;
boolean isMinus = false;
if (maybeEat("*")) {
return new TypeArgument();
} else if (maybeEat("+")) {
isPlus = true;
} else if (maybeEat("-")) {
isMinus = true;
}
FieldTypeSignature sig = parseFieldTypeSignature(false);
return new TypeArgument(isPlus, isMinus, sig);
}
private TypeArgument[] maybeParseTypeArguments() {
if (maybeEat("<")) {
List typeArgs = new ArrayList();
do {
TypeArgument arg = parseTypeArgument();
typeArgs.add(arg);
} while (!maybeEat(">"));
TypeArgument[] tArgs = new TypeArgument[typeArgs.size()];
typeArgs.toArray(tArgs);
return tArgs;
} else {
return null;
}
}
private TypeVariableSignature parseTypeVariableSignature() {
TypeVariableSignature tv = new TypeVariableSignature(eatIdentifier());
eat(";");
return tv;
}
private boolean maybeEat(String token) {
if (tokenStream.length <= tokenIndex)
return false;
if (tokenStream[tokenIndex].equals(token)) {
tokenIndex++;
return true;
}
return false;
}
private void eat(String token) {
if (!tokenStream[tokenIndex].equals(token)) {
throw new IllegalStateException("Expecting " + token + " but found " + tokenStream[tokenIndex] + " while unpacking "
+ inputString);
}
tokenIndex++;
}
private String eatIdentifier() {
return tokenStream[tokenIndex++];
}
/**
* non-private for test visibility Splits a string containing a generic signature into tokens for consumption by the parser.
*/
public String[] tokenize(String signatureString) {
char[] chars = signatureString.toCharArray();
int index = 0;
List tokens = new ArrayList();
StringBuffer identifier = new StringBuffer();
boolean inParens = false;
boolean inArray = false;
boolean couldSeePrimitive = false;
do {
switch (chars[index]) {
case '<':
if (identifier.length() > 0)
tokens.add(identifier.toString());
identifier = new StringBuffer();
tokens.add("<");
break;
case '>':
if (identifier.length() > 0)
tokens.add(identifier.toString());
identifier = new StringBuffer();
tokens.add(">");
break;
case ':':
if (identifier.length() > 0)
tokens.add(identifier.toString());
identifier = new StringBuffer();
tokens.add(":");
break;
case '/':
if (identifier.length() > 0)
tokens.add(identifier.toString());
identifier = new StringBuffer();
tokens.add("/");
couldSeePrimitive = false;
break;
case ';':
if (identifier.length() > 0)
tokens.add(identifier.toString());
identifier = new StringBuffer();
tokens.add(";");
couldSeePrimitive = true;
inArray = false;
break;
case '^':
if (identifier.length() > 0)
tokens.add(identifier.toString());
identifier = new StringBuffer();
tokens.add("^");
break;
case '+':
tokens.add("+");
break;
case '-':
tokens.add("-");
break;
case '*':
tokens.add("*");
break;
case '.':
if (identifier.length() > 0)
tokens.add(identifier.toString());
identifier = new StringBuffer();
couldSeePrimitive = false;
tokens.add(".");
break;
case '(':
tokens.add("(");
inParens = true;
couldSeePrimitive = true;
break;
case ')':
tokens.add(")");
inParens = false;
break;
case '[':
tokens.add("[");
couldSeePrimitive = true;
inArray = true;
break;
case 'B':
case 'C':
case 'D':
case 'F':
case 'I':
case 'J':
case 'S':
case 'V':
case 'Z':
if ((inParens || inArray) && couldSeePrimitive && identifier.length() == 0) {
tokens.add(new String("" + chars[index]));
} else {
identifier.append(chars[index]);
}
inArray = false;
break;
case 'L':
couldSeePrimitive = false;
// deliberate fall-through
default:
identifier.append(chars[index]);
}
} while ((++index) < chars.length);
if (identifier.length() > 0)
tokens.add(identifier.toString());
String[] tokenArray = new String[tokens.size()];
tokens.toArray(tokenArray);
return tokenArray;
}
}