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With inspiration from other libraries
/**
* MVEL 2.0
* Copyright (C) 2007 The Codehaus
* Mike Brock, Dhanji Prasanna, John Graham, Mark Proctor
*
* 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 org.mvel2.ast;
import org.mvel2.CompileException;
import org.mvel2.ParserConfiguration;
import org.mvel2.ParserContext;
import org.mvel2.compiler.Accessor;
import org.mvel2.debug.DebugTools;
import org.mvel2.integration.VariableResolverFactory;
import org.mvel2.optimizers.AccessorOptimizer;
import org.mvel2.optimizers.OptimizationNotSupported;
import java.io.Serializable;
import static java.lang.Thread.currentThread;
import static org.mvel2.Operator.NOOP;
import static org.mvel2.PropertyAccessor.get;
import static org.mvel2.optimizers.OptimizerFactory.*;
import static org.mvel2.util.CompilerTools.getInjectedImports;
import static org.mvel2.util.ParseTools.*;
@SuppressWarnings({"ManualArrayCopy", "CaughtExceptionImmediatelyRethrown"})
public class ASTNode implements Cloneable, Serializable {
public static final int LITERAL = 1;
public static final int DEEP_PROPERTY = 1 << 1;
public static final int OPERATOR = 1 << 2;
public static final int IDENTIFIER = 1 << 3;
public static final int COMPILE_IMMEDIATE = 1 << 4;
public static final int NUMERIC = 1 << 5;
public static final int INVERT = 1 << 6;
public static final int ASSIGN = 1 << 7;
public static final int COLLECTION = 1 << 8;
public static final int THISREF = 1 << 9;
public static final int INLINE_COLLECTION = 1 << 10;
public static final int BLOCK_IF = 1 << 11;
public static final int BLOCK_FOREACH = 1 << 12;
public static final int BLOCK_WITH = 1 << 13;
public static final int BLOCK_UNTIL = 1 << 14;
public static final int BLOCK_WHILE = 1 << 15;
public static final int BLOCK_DO = 1 << 16;
public static final int BLOCK_DO_UNTIL = 1 << 17;
public static final int BLOCK_FOR = 1 << 18;
public static final int OPT_SUBTR = 1 << 19;
public static final int FQCN = 1 << 20;
public static final int STACKLANG = 1 << 22;
public static final int DEFERRED_TYPE_RES = 1 << 23;
public static final int STRONG_TYPING = 1 << 24;
public static final int PCTX_STORED = 1 << 25;
public static final int ARRAY_TYPE_LITERAL = 1 << 26;
public static final int NOJIT = 1 << 27;
public static final int DEOP = 1 << 28;
public static final int DISCARD = 1 << 29;
// *** //
protected int firstUnion;
protected int endOfName;
public int fields = 0;
protected Class egressType;
protected char[] expr;
protected int start;
protected int offset;
protected String nameCache;
protected Object literal;
protected transient volatile Accessor accessor;
protected volatile Accessor safeAccessor;
protected int cursorPosition;
public ASTNode nextASTNode;
protected ParserContext pCtx;
public Object getReducedValueAccelerated(Object ctx, Object thisValue, VariableResolverFactory factory) {
if (accessor != null) {
try {
return accessor.getValue(ctx, thisValue, factory);
}
catch (ClassCastException ce) {
return deop(ctx, thisValue, factory, ce);
}
}
else {
return optimize(ctx, thisValue, factory);
}
}
private Object deop(Object ctx, Object thisValue, VariableResolverFactory factory, RuntimeException e) {
if ((fields & DEOP) == 0) {
accessor = null;
fields |= DEOP | NOJIT;
synchronized (this) {
return getReducedValueAccelerated(ctx, thisValue, factory);
}
}
else {
throw e;
}
}
private Object optimize(Object ctx, Object thisValue, VariableResolverFactory factory) {
if ((fields & DEOP) != 0) {
fields ^= DEOP;
}
AccessorOptimizer optimizer;
Object retVal = null;
if ((fields & NOJIT) != 0 || factory != null && factory.isResolveable(nameCache)) {
optimizer = getAccessorCompiler(SAFE_REFLECTIVE);
}
else {
optimizer = getDefaultAccessorCompiler();
}
ParserContext pCtx;
if ((fields & PCTX_STORED) != 0) {
pCtx = (ParserContext) literal;
}
else {
pCtx = new ParserContext(new ParserConfiguration(getInjectedImports(factory), null));
}
try {
pCtx.optimizationNotify();
setAccessor(optimizer.optimizeAccessor(pCtx, expr, start, offset, ctx, thisValue, factory, true, egressType));
}
catch (OptimizationNotSupported ne) {
setAccessor((optimizer = getAccessorCompiler(SAFE_REFLECTIVE))
.optimizeAccessor(pCtx, expr, start, offset, ctx, thisValue, factory, true, null));
}
if (accessor == null) {
return get(expr, start, offset, ctx, factory, thisValue, pCtx);
}
if (retVal == null) {
retVal = optimizer.getResultOptPass();
}
if (egressType == null) {
egressType = optimizer.getEgressType();
}
return retVal;
}
public Object getReducedValue(Object ctx, Object thisValue, VariableResolverFactory factory) {
if ((fields & (LITERAL)) != 0) {
return literal;
}
else {
return get(expr, start, offset, ctx, factory, thisValue, pCtx);
}
}
protected String getAbsoluteRootElement() {
if ((fields & (DEEP_PROPERTY | COLLECTION)) != 0) {
return new String(expr, start, getAbsoluteFirstPart());
}
return nameCache;
}
public Class getEgressType() {
return egressType;
}
public void setEgressType(Class egressType) {
this.egressType = egressType;
}
public char[] getNameAsArray() {
return subArray(expr, start, start + offset);
}
private int getAbsoluteFirstPart() {
if ((fields & COLLECTION) != 0) {
if (firstUnion < 0 || endOfName < firstUnion) return endOfName;
else return firstUnion;
}
else if ((fields & DEEP_PROPERTY) != 0) {
return firstUnion;
}
else {
return -1;
}
}
public String getAbsoluteName() {
if (firstUnion > start) {
return new String(expr, start, getAbsoluteFirstPart() - start);
}
else {
return getName();
}
}
public String getName() {
if (nameCache != null) {
return nameCache;
}
else if (expr != null) {
return nameCache = new String(expr, start, offset);
}
return "";
}
public Object getLiteralValue() {
return literal;
}
public void storeInLiteralRegister(Object o) {
this.literal = o;
}
public void setLiteralValue(Object literal) {
this.literal = literal;
this.fields |= LITERAL;
}
@SuppressWarnings({"SuspiciousMethodCalls"})
protected void setName(char[] name) {
if (isNumber(name, start, offset)) {
egressType = (literal = handleNumericConversion(name, start, offset)).getClass();
if (((fields |= NUMERIC | LITERAL | IDENTIFIER) & INVERT) != 0) {
try {
literal = ~((Integer) literal);
}
catch (ClassCastException e) {
throw new CompileException("bitwise (~) operator can only be applied to integers", expr, start);
}
}
return;
}
this.literal = new String(name, start, offset);
int end = start + offset;
Scan:
for (int i = start; i < end; i++) {
switch (name[i]) {
case '.':
if (firstUnion == 0) {
firstUnion = i;
}
break;
case '[':
case '(':
if (firstUnion == 0) {
firstUnion = i;
}
if (endOfName == 0) {
endOfName = i;
if (i < name.length && name[i + 1] == ']') fields |= ARRAY_TYPE_LITERAL;
break Scan;
}
}
}
if ((fields & INLINE_COLLECTION) != 0) {
return;
}
if (firstUnion > start) {
fields |= DEEP_PROPERTY | IDENTIFIER;
}
else {
fields |= IDENTIFIER;
}
}
public Accessor setAccessor(Accessor accessor) {
return this.accessor = accessor;
}
public boolean isIdentifier() {
return (fields & IDENTIFIER) != 0;
}
public boolean isLiteral() {
return (fields & LITERAL) != 0;
}
public boolean isThisVal() {
return (fields & THISREF) != 0;
}
public boolean isOperator() {
return (fields & OPERATOR) != 0;
}
public boolean isOperator(Integer operator) {
return (fields & OPERATOR) != 0 && operator.equals(literal);
}
public Integer getOperator() {
return NOOP;
}
protected boolean isCollection() {
return (fields & COLLECTION) != 0;
}
public boolean isAssignment() {
return ((fields & ASSIGN) != 0);
}
public boolean isDeepProperty() {
return ((fields & DEEP_PROPERTY) != 0);
}
public boolean isFQCN() {
return ((fields & FQCN) != 0);
}
public void setAsLiteral() {
fields |= LITERAL;
}
public void setAsFQCNReference() {
fields |= FQCN;
}
public int getCursorPosition() {
return cursorPosition;
}
public void setCursorPosition(int cursorPosition) {
this.cursorPosition = cursorPosition;
}
public boolean isDiscard() {
return fields != -1 && (fields & DISCARD) != 0;
}
public void discard() {
this.fields |= DISCARD;
}
public void strongTyping() {
this.fields |= STRONG_TYPING;
}
public void storePctx() {
this.fields |= PCTX_STORED;
}
public boolean isDebuggingSymbol() {
return this.fields == -1;
}
public int getFields() {
return fields;
}
public Accessor getAccessor() {
return accessor;
}
public boolean canSerializeAccessor() {
return safeAccessor != null;
}
public int getStart() {
return start;
}
public int getOffset() {
return offset;
}
public char[] getExpr() {
return expr;
}
protected ASTNode(ParserContext pCtx) {
this.pCtx = pCtx;
}
public ASTNode(char[] expr, int start, int offset, int fields, ParserContext pCtx) {
this(pCtx);
this.fields = fields;
this.expr = expr;
this.start = start;
this.offset = offset;
setName(expr);
}
public String toString() {
return isOperator() ? "<<" + DebugTools.getOperatorName(getOperator()) + ">>" :
(PCTX_STORED & fields) != 0 ? nameCache : new String(expr, start, offset);
}
protected ClassLoader getClassLoader() {
return pCtx != null ? pCtx.getClassLoader() : currentThread().getContextClassLoader();
}
}