1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
|
/*
* Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code 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 General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package jdk.nashorn.internal.ir;
import jdk.nashorn.internal.ir.annotations.Immutable;
import jdk.nashorn.internal.ir.visitor.NodeVisitor;
/**
* IR representation for executing bare expressions. Basically, an expression
* node means "this code will be executed" and evaluating it results in
* statements being added to the IR
*/
@Immutable
public final class ExpressionStatement extends Statement {
/** Expression to execute. */
private final Expression expression;
/**
* Constructor
*
* @param lineNumber line number
* @param token token
* @param finish finish
* @param expression the expression to execute
*/
public ExpressionStatement(final int lineNumber, final long token, final int finish, final Expression expression) {
super(lineNumber, token, finish);
this.expression = expression;
}
private ExpressionStatement(final ExpressionStatement expressionStatement, final Expression expression) {
super(expressionStatement);
this.expression = expression;
}
@Override
public boolean isTerminal() {
return expression.isTerminal();
}
@Override
public Node accept(final NodeVisitor<? extends LexicalContext> visitor) {
if (visitor.enterExpressionStatement(this)) {
return visitor.leaveExpressionStatement(setExpression((Expression)expression.accept(visitor)));
}
return this;
}
@Override
public void toString(final StringBuilder sb) {
expression.toString(sb);
}
/**
* Return the expression to be executed
* @return the expression
*/
public Expression getExpression() {
return expression;
}
/**
* Reset the expression to be executed
* @param expression the expression
* @return new or same execute node
*/
public ExpressionStatement setExpression(final Expression expression) {
if (this.expression == expression) {
return this;
}
return new ExpressionStatement(this, expression);
}
}
|