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/***
* ASM: a very small and fast Java bytecode manipulation framework
* Copyright (c) 2000-2011 INRIA, France Telecom
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.snapscript.asm.signature;
/**
* A type signature parser to make a signature visitor visit an existing
* signature.
*
* @author Thomas Hallgren
* @author Eric Bruneton
*/
public class SignatureReader {
/**
* The signature to be read.
*/
private final String signature;
/**
* Constructs a {@link SignatureReader} for the given signature.
*
* @param signature
* A ClassSignature, MethodTypeSignature, or
* FieldTypeSignature.
*/
public SignatureReader(final String signature) {
this.signature = signature;
}
/**
* Makes the given visitor visit the signature of this
* {@link SignatureReader}. This signature is the one specified in the
* constructor (see {@link #SignatureReader(String) SignatureReader}). This
* method is intended to be called on a {@link SignatureReader} that was
* created using a ClassSignature (such as the signature
* parameter of the {@link org.snapscript.asm.ClassVisitor#visit
* ClassVisitor.visit} method) or a MethodTypeSignature (such as the
* signature parameter of the
* {@link org.snapscript.asm.ClassVisitor#visitMethod
* ClassVisitor.visitMethod} method).
*
* @param v
* the visitor that must visit this signature.
*/
public void accept(final SignatureVisitor v) {
String signature = this.signature;
int len = signature.length();
int pos;
char c;
if (signature.charAt(0) == '<') {
pos = 2;
do {
int end = signature.indexOf(':', pos);
v.visitFormalTypeParameter(signature.substring(pos - 1, end));
pos = end + 1;
c = signature.charAt(pos);
if (c == 'L' || c == '[' || c == 'T') {
pos = parseType(signature, pos, v.visitClassBound());
}
while ((c = signature.charAt(pos++)) == ':') {
pos = parseType(signature, pos, v.visitInterfaceBound());
}
} while (c != '>');
} else {
pos = 0;
}
if (signature.charAt(pos) == '(') {
pos++;
while (signature.charAt(pos) != ')') {
pos = parseType(signature, pos, v.visitParameterType());
}
pos = parseType(signature, pos + 1, v.visitReturnType());
while (pos < len) {
pos = parseType(signature, pos + 1, v.visitExceptionType());
}
} else {
pos = parseType(signature, pos, v.visitSuperclass());
while (pos < len) {
pos = parseType(signature, pos, v.visitInterface());
}
}
}
/**
* Makes the given visitor visit the signature of this
* {@link SignatureReader}. This signature is the one specified in the
* constructor (see {@link #SignatureReader(String) SignatureReader}). This
* method is intended to be called on a {@link SignatureReader} that was
* created using a FieldTypeSignature, such as the
* signature parameter of the
* {@link org.snapscript.asm.ClassVisitor#visitField ClassVisitor.visitField}
* or {@link org.snapscript.asm.MethodVisitor#visitLocalVariable
* MethodVisitor.visitLocalVariable} methods.
*
* @param v
* the visitor that must visit this signature.
*/
public void acceptType(final SignatureVisitor v) {
parseType(this.signature, 0, v);
}
/**
* Parses a field type signature and makes the given visitor visit it.
*
* @param signature
* a string containing the signature that must be parsed.
* @param pos
* index of the first character of the signature to parsed.
* @param v
* the visitor that must visit this signature.
* @return the index of the first character after the parsed signature.
*/
private static int parseType(final String signature, int pos,
final SignatureVisitor v) {
char c;
int start, end;
boolean visited, inner;
String name;
switch (c = signature.charAt(pos++)) {
case 'Z':
case 'C':
case 'B':
case 'S':
case 'I':
case 'F':
case 'J':
case 'D':
case 'V':
v.visitBaseType(c);
return pos;
case '[':
return parseType(signature, pos, v.visitArrayType());
case 'T':
end = signature.indexOf(';', pos);
v.visitTypeVariable(signature.substring(pos, end));
return end + 1;
default: // case 'L':
start = pos;
visited = false;
inner = false;
for (;;) {
switch (c = signature.charAt(pos++)) {
case '.':
case ';':
if (!visited) {
name = signature.substring(start, pos - 1);
if (inner) {
v.visitInnerClassType(name);
} else {
v.visitClassType(name);
}
}
if (c == ';') {
v.visitEnd();
return pos;
}
start = pos;
visited = false;
inner = true;
break;
case '<':
name = signature.substring(start, pos - 1);
if (inner) {
v.visitInnerClassType(name);
} else {
v.visitClassType(name);
}
visited = true;
top: for (;;) {
switch (c = signature.charAt(pos)) {
case '>':
break top;
case '*':
++pos;
v.visitTypeArgument();
break;
case '+':
case '-':
pos = parseType(signature, pos + 1,
v.visitTypeArgument(c));
break;
default:
pos = parseType(signature, pos,
v.visitTypeArgument('='));
break;
}
}
}
}
}
}
}
