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/*
* de.unkrig.commons - A general-purpose Java class library
*
* Copyright (c) 2011, Arno Unkrig
* 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. The name of the author may not be used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 de.unkrig.commons.asm;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.Type;
import org.objectweb.asm.tree.InsnList;
import org.objectweb.asm.tree.InsnNode;
import org.objectweb.asm.tree.LdcInsnNode;
import org.objectweb.asm.tree.MethodInsnNode;
import org.objectweb.asm.tree.TypeInsnNode;
/**
* Bytecode generator for {@link StringBuilder}-based concatenation of strings.
*/
public
class StringConcatenator {
private static final Map STRING_BUILDER_APPEND_TYPES;
static {
Map m = new HashMap();
m.put(Type.BOOLEAN_TYPE, "(Z)Ljava/lang/StringBuilder;");
m.put(Type.CHAR_TYPE, "(C)Ljava/lang/StringBuilder;");
m.put(Type.BYTE_TYPE, "(I)Ljava/lang/StringBuilder;");
m.put(Type.SHORT_TYPE, "(I)Ljava/lang/StringBuilder;");
m.put(Type.INT_TYPE, "(I)Ljava/lang/StringBuilder;");
m.put(Type.FLOAT_TYPE, "(F)Ljava/lang/StringBuilder;");
m.put(Type.LONG_TYPE, "(J)Ljava/lang/StringBuilder;");
m.put(Type.DOUBLE_TYPE, "(D)Ljava/lang/StringBuilder;");
m.put(Types.OBJECT_TYPE, "(Ljava/lang/Object;)Ljava/lang/StringBuilder;");
m.put(Types.CHAR_SEQUENCE_TYPE, "(Ljava/lang/CharSequence;)Ljava/lang/StringBuilder;");
m.put(Types.STRING_TYPE, "(Ljava/lang/String;)Ljava/lang/StringBuilder;");
m.put(Types.STRING_BUFFER_TYPE, "(Ljava/lang/StringBuffer;)Ljava/lang/StringBuilder;");
STRING_BUILDER_APPEND_TYPES = Collections.unmodifiableMap(m);
}
private static final Map STRING_VALUE_OF_TYPES;
static {
Map m = new HashMap();
m.put(Type.BOOLEAN_TYPE, "(Z)Ljava/lang/String;");
m.put(Type.CHAR_TYPE, "(C)Ljava/lang/String;");
m.put(Type.BYTE_TYPE, "(I)Ljava/lang/String;");
m.put(Type.SHORT_TYPE, "(I)Ljava/lang/String;");
m.put(Type.INT_TYPE, "(I)Ljava/lang/String;");
m.put(Type.FLOAT_TYPE, "(F)Ljava/lang/String;");
m.put(Type.LONG_TYPE, "(J)Ljava/lang/String;");
m.put(Type.DOUBLE_TYPE, "(D)Ljava/lang/String;");
m.put(Types.OBJECT_TYPE, "(Ljava/lang/Object;)Ljava/lang/String;");
STRING_VALUE_OF_TYPES = Collections.unmodifiableMap(m);
}
private final List components = new ArrayList();
/**
* Registers the given constant string, which will be added on {@link #finish()}.
*
* @return {@code this}
*/
public StringConcatenator
appendConstant(String value) {
if (value.length() == 0) return this;
if (!this.components.isEmpty()) {
Component c = this.components.get(this.components.size() - 1);
if (c instanceof ConstantComponent) {
ConstantComponent cc = (ConstantComponent) c;
cc.value += value;
return this;
}
}
this.components.add(new ConstantComponent(value));
return this;
}
/**
* Registers the given code fragment, which will be executed, and the result added on {@link #finish()}.
*
* @param insns Instructions which must produce exactly one value of {@code type} on the operand stack
* @return {@code this}
*/
public StringConcatenator
appendVariable(InsnList insns, Type type) {
this.components.add(new VariableComponent(insns, type));
return this;
}
/**
* Registers the given code fragment, which will be executed, and the result added on {@link #finish()}. If the
* {@code type} is an array, a string, {@link StringBuffer}, {@link StringBuilder}, {@link CharSequence} or a
* {@code char}, then it is 'pretty-printed' i nthe style of a Java constant.
*
* @param code Instructions which must produce exactly one value of {@code type} on the operand stack
* @return {@code this}
*/
public StringConcatenator
appendVariablePrettily(InsnList code, Type type) {
if (type.getSort() == Type.ARRAY) {
Type et = type.getElementType();
if (et.getSort() == Type.ARRAY || et.getSort() == Type.OBJECT) {
code.add(new MethodInsnNode(
Opcodes.INVOKESTATIC,
"java/util/Arrays",
"deepToString",
"([Ljava/lang/Object;)Ljava/lang/String;"
));
this.appendVariable(code, Types.STRING_TYPE);
} else {
code.add(new MethodInsnNode(
Opcodes.INVOKESTATIC,
"java/util/Arrays",
"toString",
"([" + et.getDescriptor() + ")Ljava/lang/String;"
));
this.appendVariable(code, Types.STRING_TYPE);
}
} else
if (
type.equals(Types.STRING_TYPE)
|| type.equals(Types.STRING_BUFFER_TYPE)
|| type.equals(Types.STRING_BUILDER_TYPE)
|| type.equals(Types.CHAR_SEQUENCE_TYPE)
) {
this.appendConstant("\"");
this.appendVariable(code, type);
this.appendConstant("\"");
} else
if (type.equals(Type.CHAR_TYPE)) {
this.appendConstant("'");
this.appendVariable(code, Type.CHAR_TYPE);
this.appendConstant("'");
} else
{
this.appendVariable(code, type);
}
return this;
}
/**
* @return The {@link InsnList} that implements the creation of the string result
*/
public InsnList
finish() {
InsnList insns = new InsnList();
switch (this.components.size()) {
case 0:
insns.add(new LdcInsnNode(""));
break;
case 1:
this.components.get(0).pushAsString(insns);
break;
case 2:
this.components.get(0).pushAsString(insns);
this.components.get(1).pushAsString(insns);
insns.add(new MethodInsnNode(
Opcodes.INVOKEVIRTUAL,
"java/lang/String",
"concat",
"(Ljava/lang/String;)Ljava/lang/String;"
));
break;
default:
insns.add(new TypeInsnNode(Opcodes.NEW, "java/lang/StringBuilder"));
insns.add(new InsnNode(Opcodes.DUP));
(this.components.get(0)).pushAsString(insns);
insns.add(new MethodInsnNode(
Opcodes.INVOKESPECIAL,
"java/lang/StringBuilder",
"",
"(Ljava/lang/String;)V"
));
for (int i = 1; i < this.components.size(); ++i) {
Component c = this.components.get(i);
Type t = c.push(insns);
String md = StringConcatenator.STRING_BUILDER_APPEND_TYPES.get(t);
if (md == null) md = "(Ljava/lang/Object;)Ljava/lang/StringBuilder;";
insns.add(new MethodInsnNode(Opcodes.INVOKEVIRTUAL, "java/lang/StringBuilder", "append", md));
}
insns.add(new MethodInsnNode(
Opcodes.INVOKEVIRTUAL,
"java/lang/StringBuilder",
"toString",
"()Ljava/lang/String;"
));
}
return insns;
}
interface Component {
/**
* Adds instructions to the given which produces the value of this component on the operand stack.
*
* @return The type of this component
*/
Type
push(InsnList result);
/**
* Adds instructions to the given which produces the value of this component on the operand stack and converts
* it to a string.
*/
void
pushAsString(InsnList result);
}
class ConstantComponent implements StringConcatenator.Component {
/**
* The constant string value.
*/
String value;
ConstantComponent(String value) {
assert value != null;
this.value = value;
}
@Override public Type
push(InsnList result) {
result.add(new LdcInsnNode(this.value));
return Types.STRING_TYPE;
}
@Override public void
pushAsString(InsnList result) {
result.add(new LdcInsnNode(this.value));
}
}
class VariableComponent implements StringConcatenator.Component {
private final InsnList insns;
private final Type type;
VariableComponent(InsnList insns, Type type) {
this.insns = insns;
this.type = type;
}
@Override public Type
push(InsnList result) {
result.add(this.insns);
return this.type;
}
@Override public void
pushAsString(InsnList result) {
result.add(this.insns);
String md = StringConcatenator.STRING_VALUE_OF_TYPES.get(this.type);
if (md == null) md = "(Ljava/lang/Object;)Ljava/lang/String;";
result.add(new MethodInsnNode(Opcodes.INVOKESTATIC, "java/lang/String", "valueOf", md));
}
}
}
