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The core parser functionality. This may be all you need.
/*
* Copyright (C) 2007-2010 Júlio Vilmar Gesser.
* Copyright (C) 2011, 2013-2023 The JavaParser Team.
*
* This file is part of JavaParser.
*
* JavaParser can be used either under the terms of
* a) the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
* b) the terms of the Apache License
*
* You should have received a copy of both licenses in LICENCE.LGPL and
* LICENCE.APACHE. Please refer to those files for details.
*
* JavaParser is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*/
package com.github.javaparser.ast.expr;
import com.github.javaparser.TokenRange;
import com.github.javaparser.ast.AllFieldsConstructor;
import com.github.javaparser.ast.Generated;
import com.github.javaparser.ast.Node;
import com.github.javaparser.ast.observer.ObservableProperty;
import com.github.javaparser.ast.visitor.CloneVisitor;
import com.github.javaparser.ast.visitor.GenericVisitor;
import com.github.javaparser.ast.visitor.VoidVisitor;
import com.github.javaparser.metamodel.AssignExprMetaModel;
import com.github.javaparser.metamodel.JavaParserMetaModel;
import com.github.javaparser.printer.Stringable;
import java.util.Optional;
import java.util.function.Consumer;
import static com.github.javaparser.utils.Utils.assertNotNull;
/**
* An assignment expression. It supports the operators that are found the AssignExpr.Operator enum.
*
{@code a=5}
*
{@code time+=500}
*
{@code watch.time+=500}
*
{@code (((time)))=100*60}
*
{@code peanut[a]=true}
*
* @author Julio Vilmar Gesser
*/
public class AssignExpr extends Expression {
public enum Operator implements Stringable {
ASSIGN("="),
PLUS("+="),
MINUS("-="),
MULTIPLY("*="),
DIVIDE("/="),
BINARY_AND("&="),
BINARY_OR("|="),
XOR("^="),
REMAINDER("%="),
LEFT_SHIFT("<<="),
SIGNED_RIGHT_SHIFT(">>="),
UNSIGNED_RIGHT_SHIFT(">>>=");
private final String codeRepresentation;
Operator(String codeRepresentation) {
this.codeRepresentation = codeRepresentation;
}
public String asString() {
return codeRepresentation;
}
public Optional toBinaryOperator() {
switch(this) {
case PLUS:
return Optional.of(BinaryExpr.Operator.PLUS);
case MINUS:
return Optional.of(BinaryExpr.Operator.MINUS);
case MULTIPLY:
return Optional.of(BinaryExpr.Operator.MULTIPLY);
case DIVIDE:
return Optional.of(BinaryExpr.Operator.DIVIDE);
case BINARY_AND:
return Optional.of(BinaryExpr.Operator.BINARY_AND);
case BINARY_OR:
return Optional.of(BinaryExpr.Operator.BINARY_OR);
case XOR:
return Optional.of(BinaryExpr.Operator.XOR);
case REMAINDER:
return Optional.of(BinaryExpr.Operator.REMAINDER);
case LEFT_SHIFT:
return Optional.of(BinaryExpr.Operator.LEFT_SHIFT);
case SIGNED_RIGHT_SHIFT:
return Optional.of(BinaryExpr.Operator.SIGNED_RIGHT_SHIFT);
case UNSIGNED_RIGHT_SHIFT:
return Optional.of(BinaryExpr.Operator.UNSIGNED_RIGHT_SHIFT);
default:
return Optional.empty();
}
}
}
private Expression target;
private Expression value;
private Operator operator;
public AssignExpr() {
this(null, new NameExpr(), new StringLiteralExpr(), Operator.ASSIGN);
}
@AllFieldsConstructor
public AssignExpr(Expression target, Expression value, Operator operator) {
this(null, target, value, operator);
}
/**
* This constructor is used by the parser and is considered private.
*/
@Generated("com.github.javaparser.generator.core.node.MainConstructorGenerator")
public AssignExpr(TokenRange tokenRange, Expression target, Expression value, Operator operator) {
super(tokenRange);
setTarget(target);
setValue(value);
setOperator(operator);
customInitialization();
}
@Override
@Generated("com.github.javaparser.generator.core.node.AcceptGenerator")
public R accept(final GenericVisitor v, final A arg) {
return v.visit(this, arg);
}
@Override
@Generated("com.github.javaparser.generator.core.node.AcceptGenerator")
public void accept(final VoidVisitor v, final A arg) {
v.visit(this, arg);
}
@Generated("com.github.javaparser.generator.core.node.PropertyGenerator")
public Operator getOperator() {
return operator;
}
@Generated("com.github.javaparser.generator.core.node.PropertyGenerator")
public Expression getTarget() {
return target;
}
@Generated("com.github.javaparser.generator.core.node.PropertyGenerator")
public Expression getValue() {
return value;
}
@Generated("com.github.javaparser.generator.core.node.PropertyGenerator")
public AssignExpr setOperator(final Operator operator) {
assertNotNull(operator);
if (operator == this.operator) {
return this;
}
notifyPropertyChange(ObservableProperty.OPERATOR, this.operator, operator);
this.operator = operator;
return this;
}
@Generated("com.github.javaparser.generator.core.node.PropertyGenerator")
public AssignExpr setTarget(final Expression target) {
assertNotNull(target);
if (target == this.target) {
return this;
}
notifyPropertyChange(ObservableProperty.TARGET, this.target, target);
if (this.target != null)
this.target.setParentNode(null);
this.target = target;
setAsParentNodeOf(target);
return this;
}
@Generated("com.github.javaparser.generator.core.node.PropertyGenerator")
public AssignExpr setValue(final Expression value) {
assertNotNull(value);
if (value == this.value) {
return this;
}
notifyPropertyChange(ObservableProperty.VALUE, this.value, value);
if (this.value != null)
this.value.setParentNode(null);
this.value = value;
setAsParentNodeOf(value);
return this;
}
@Override
@Generated("com.github.javaparser.generator.core.node.CloneGenerator")
public AssignExpr clone() {
return (AssignExpr) accept(new CloneVisitor(), null);
}
@Override
@Generated("com.github.javaparser.generator.core.node.GetMetaModelGenerator")
public AssignExprMetaModel getMetaModel() {
return JavaParserMetaModel.assignExprMetaModel;
}
@Override
@Generated("com.github.javaparser.generator.core.node.ReplaceMethodGenerator")
public boolean replace(Node node, Node replacementNode) {
if (node == null) {
return false;
}
if (node == target) {
setTarget((Expression) replacementNode);
return true;
}
if (node == value) {
setValue((Expression) replacementNode);
return true;
}
return super.replace(node, replacementNode);
}
@Override
@Generated("com.github.javaparser.generator.core.node.TypeCastingGenerator")
public boolean isAssignExpr() {
return true;
}
@Override
@Generated("com.github.javaparser.generator.core.node.TypeCastingGenerator")
public AssignExpr asAssignExpr() {
return this;
}
@Override
@Generated("com.github.javaparser.generator.core.node.TypeCastingGenerator")
public void ifAssignExpr(Consumer action) {
action.accept(this);
}
@Override
@Generated("com.github.javaparser.generator.core.node.TypeCastingGenerator")
public Optional toAssignExpr() {
return Optional.of(this);
}
/*
* Returns true if the expression is an assignment context
* https://docs.oracle.com/javase/specs/jls/se8/html/jls-5.html#jls-5.2
* 5.2. Assignment Contexts: Assignment contexts allow the value of an expression to be assigned (§15.26) to a variable;...
*/
@Override
protected boolean isAssignmentContext() {
return true;
}
}