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