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/*
* UnaryExpression.java 1.0
*
* Jun 20, 1997 by mich
* Sep 29, 1997 by bv
* Oct 10, 1997 by mich
*
* @see io.devnulllabs.openjava.ptree.ParseTree
* @version 1.0 last updated: Oct 10, 1997
* @author Michiaki Tatsubori
*/
package io.devnulllabs.openjava.ptree;
import io.devnulllabs.openjava.mop.Environment;
import io.devnulllabs.openjava.mop.OJClass;
import io.devnulllabs.openjava.ptree.util.ParseTreeVisitor;
/**
* The <code>UnaryExpression</code> class presents for an expression which
* consists of unary operator with one Expression.
* <br>
* The unary expressions are :
* <br><blockquote>
* <code>expr++</code>, <code>expr--</code>,
* <code>++expr</code>, <code>--expr</code>,
* <code>^expr</code>, <code>!expr</code>,
* <code>+expr</code> or <code>-expr</code>
* </blockquote><br>
* ,where <code>expr<code> is an expression.
* <br>
* If the operator in the expression of the operand has week unity,
* this automatically produces the code in which the operand
* is enclosed by parenthesises.
* <br>
* In the case the operand is <code>y = x</code> and
* the urary operator is <code>+</code>,
* this produces the code :
* <br><blockquote><pre>
* +(y = x)
* </pre></blockquote><br>
*
* @see io.devnulllabs.openjava.ptree.NonLeaf
* @see io.devnulllabs.openjava.ptree.Expression
*/
public class UnaryExpression extends NonLeaf implements Expression {
/**
* Post increment operator like:
* <br><blockquote><pre>
* i++
* </pre></blockquote><br>
*/
public static final int POST_INCREMENT = 0;
/**
* Post decrement operator like:
* <br><blockquote><pre>
* i--
* </pre></blockquote><br>
*/
public static final int POST_DECREMENT = 1;
/**
* Pre increment operator like:
* <br><blockquote><pre>
* ++i
* </pre></blockquote><br>
*/
public static final int PRE_INCREMENT = 2;
/**
* Post increment operator like:
* <br><blockquote><pre>
* --i
* </pre></blockquote><br>
*/
public static final int PRE_DECREMENT = 3;
/**
* Post increment operator like:
* <br><blockquote><pre>
* ~i
* </pre></blockquote><br>
*/
public static final int BIT_NOT = 4;
/**
* Post increment operator like:
* <br><blockquote><pre>
* ! c
* </pre></blockquote><br>
*/
public static final int NOT = 5;
/**
* Post increment operator like:
* <br><blockquote><pre>
* +i
* </pre></blockquote><br>
*/
public static final int PLUS = 6;
/**
* Post increment operator like:
* <br><blockquote><pre>
* -i
* </pre></blockquote><br>
*/
public static final int MINUS = 7;
private static final String opr_string[] =
{ "++", "--", "++", "--", "~", "!", "+", "-" };
/** operator */
private int opr = -1;
/**
* Allocates a new object.
*
* @param opr the operator of this unary expression.
* @param expr the expression.
*/
public UnaryExpression(int opr, Expression expr) {
super();
set((ParseTree) expr);
this.opr = opr;
}
/**
* Allocates a new object.
*
* @param expr the expression.
* @param opr the operator of this unary expression.
*/
public UnaryExpression(Expression expr, int opr) {
super();
set((ParseTree) expr);
this.opr = opr;
}
UnaryExpression() {
super();
}
public ParseTree makeRecursiveCopy() {
UnaryExpression result = (UnaryExpression) super.makeRecursiveCopy();
result.opr = this.opr;
return result;
}
public ParseTree makeCopy() {
UnaryExpression result = (UnaryExpression) super.makeCopy();
result.opr = this.opr;
return result;
}
/**
* Gets the expression operated in this expression.
*
* @return the expression.
*/
public Expression getExpression() {
return (Expression) elementAt(0);
}
/**
* Sets the expression operated in this expression.
*
* @param expr the expression to set.
*/
public void setExpression(Expression expr) {
setElementAt(expr, 0);
}
/**
* Gets the operator of this unary expression.
*
* @return the operator.
* @see io.devnulllabs.openjava.ptree.UnaryExpression#POST_INCREMENT
* @see io.devnulllabs.openjava.ptree.UnaryExpression#POST_DECREMENT
* @see io.devnulllabs.openjava.ptree.UnaryExpression#PRE_INCREMENT
* @see io.devnulllabs.openjava.ptree.UnaryExpression#PRE_DECREMENT
* @see io.devnulllabs.openjava.ptree.UnaryExpression#BIT_NOT
* @see io.devnulllabs.openjava.ptree.UnaryExpression#NOT
* @see io.devnulllabs.openjava.ptree.UnaryExpression#PLUS
* @see io.devnulllabs.openjava.ptree.UnaryExpression#MINUS
*/
public int getOperator() {
return opr;
}
/**
* Sets the operator of this unary expression.
*
* @param opr the operator id to set.
* @see io.devnulllabs.openjava.ptree.UnaryExpression#POST_INCREMENT
* @see io.devnulllabs.openjava.ptree.UnaryExpression#POST_DECREMENT
* @see io.devnulllabs.openjava.ptree.UnaryExpression#PRE_INCREMENT
* @see io.devnulllabs.openjava.ptree.UnaryExpression#PRE_DECREMENT
* @see io.devnulllabs.openjava.ptree.UnaryExpression#BIT_NOT
* @see io.devnulllabs.openjava.ptree.UnaryExpression#NOT
* @see io.devnulllabs.openjava.ptree.UnaryExpression#PLUS
* @see io.devnulllabs.openjava.ptree.UnaryExpression#MINUS
*/
public void setOperator(int opr) {
this.opr = opr;
}
/**
* Tests if the operator of unary expression is a postfix operator.
*
* @return true if the operator is postfix.
*/
public boolean isPostfix() {
if (opr == POST_DECREMENT || opr == POST_INCREMENT)
return true;
return false;
}
/**
* Tests if the operator of unary expression is a prefix operator.
*
* @return true if the operator is prefix.
*/
public boolean isPrefix() {
return !isPostfix();
}
public String operatorString() {
return opr_string[opr];
}
public void accept(ParseTreeVisitor v) throws ParseTreeException {
v.visit(this);
}
public OJClass getType(Environment env) throws Exception {
return getExpression().getType(env);
}
}
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