/**
* 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.MVEL;
import org.mvel2.ParserContext;
import org.mvel2.PropertyAccessor;
import org.mvel2.compiler.CompiledAccExpression;
import org.mvel2.compiler.ExecutableStatement;
import org.mvel2.integration.VariableResolverFactory;
import static org.mvel2.MVEL.compileSetExpression;
import static org.mvel2.util.ArrayTools.findFirst;
import static org.mvel2.util.ParseTools.*;
/**
* @author Christopher Brock
*/
public class AssignmentNode extends ASTNode implements Assignment {
private String assignmentVar;
private String varName;
private transient CompiledAccExpression accExpr;
private char[] indexTarget;
private String index;
// private char[] stmt;
private ExecutableStatement statement;
private boolean col = false;
public AssignmentNode(char[] expr, int start, int offset, int fields, ParserContext pCtx) {
super(pCtx);
this.expr = expr;
this.start = start;
this.offset = offset;
int assignStart;
if ((assignStart = find(expr, start, offset, '=')) != -1) {
this.varName = createStringTrimmed(expr, start, assignStart - start);
this.assignmentVar = varName;
this.start = skipWhitespace(expr, assignStart + 1);
if (this.start >= start + offset) {
throw new CompileException("unexpected end of statement", expr, assignStart + 1);
}
this.offset = offset - (this.start - start);
if ((fields & COMPILE_IMMEDIATE) != 0) {
this.egressType = (statement = (ExecutableStatement)
subCompileExpression(expr, this.start, this.offset, pCtx)).getKnownEgressType();
}
if (col = ((endOfName = findFirst('[', 0, this.varName.length(), indexTarget = this.varName.toCharArray())) > 0)) {
if (((this.fields |= COLLECTION) & COMPILE_IMMEDIATE) != 0) {
accExpr = (CompiledAccExpression) compileSetExpression(indexTarget, pCtx);
}
this.varName = new String(expr, start, endOfName);
index = new String(indexTarget, endOfName, indexTarget.length - endOfName);
}
try {
checkNameSafety(this.varName);
}
catch (RuntimeException e) {
throw new CompileException(e.getMessage(), expr, start);
}
}
else {
try {
checkNameSafety(this.varName = new String(expr, start, offset));
this.assignmentVar = varName;
}
catch (RuntimeException e) {
throw new CompileException(e.getMessage(), expr, start);
}
}
if ((fields & COMPILE_IMMEDIATE) != 0) {
pCtx.addVariable(this.varName, egressType);
}
}
public Object getReducedValueAccelerated(Object ctx, Object thisValue, VariableResolverFactory factory) {
if (accExpr == null && indexTarget != null) {
accExpr = (CompiledAccExpression) compileSetExpression(indexTarget);
}
if (col) {
return accExpr.setValue(ctx, thisValue, factory, statement.getValue(ctx, thisValue, factory));
}
else if (statement != null) {
if (factory == null)
throw new CompileException("cannot assign variables; no variable resolver factory available", expr, start);
return factory.createVariable(varName, statement.getValue(ctx, thisValue, factory)).getValue();
}
else {
if (factory == null)
throw new CompileException("cannot assign variables; no variable resolver factory available", expr, start);
factory.createVariable(varName, null);
return null;
}
}
public Object getReducedValue(Object ctx, Object thisValue, VariableResolverFactory factory) {
checkNameSafety(varName);
if (col) {
PropertyAccessor.set(factory.getVariableResolver(varName).getValue(), factory, index, ctx = MVEL.eval(expr, start, offset, ctx, factory), pCtx);
}
else {
return factory.createVariable(varName, MVEL.eval(expr, start, offset, ctx, factory)).getValue();
}
return ctx;
}
public String getAssignmentVar() {
return assignmentVar;
}
public char[] getExpression() {
return subset(expr, start, offset);
}
public boolean isNewDeclaration() {
return false;
}
public void setValueStatement(ExecutableStatement stmt) {
this.statement = stmt;
}
@Override
public String toString() {
return assignmentVar + " = " + new String(expr, start, offset);
}
}