1
2
3 package org.codehaus.aspectwerkz.expression.ast;
4
5 class JJTExpressionParserState {
6 private java.util.Stack nodes;
7
8 private java.util.Stack marks;
9
10 private int sp;
11
12 private int mk;
13
14 private boolean node_created;
15
16 JJTExpressionParserState() {
17 nodes = new java.util.Stack();
18 marks = new java.util.Stack();
19 sp = 0;
20 mk = 0;
21 }
22
23
24
25
26
27 boolean nodeCreated() {
28 return node_created;
29 }
30
31
32
33
34 void reset() {
35 nodes.removeAllElements();
36 marks.removeAllElements();
37 sp = 0;
38 mk = 0;
39 }
40
41
42
43
44 Node rootNode() {
45 return (Node) nodes.elementAt(0);
46 }
47
48
49 void pushNode(Node n) {
50 nodes.push(n);
51 ++sp;
52 }
53
54
55
56
57 Node popNode() {
58 if (--sp < mk) {
59 mk = ((Integer) marks.pop()).intValue();
60 }
61 return (Node) nodes.pop();
62 }
63
64
65 Node peekNode() {
66 return (Node) nodes.peek();
67 }
68
69
70
71
72 int nodeArity() {
73 return sp - mk;
74 }
75
76 void clearNodeScope(Node n) {
77 while (sp > mk) {
78 popNode();
79 }
80 mk = ((Integer) marks.pop()).intValue();
81 }
82
83 void openNodeScope(Node n) {
84 marks.push(new Integer(mk));
85 mk = sp;
86 n.jjtOpen();
87 }
88
89
90
91
92
93 void closeNodeScope(Node n, int num) {
94 mk = ((Integer) marks.pop()).intValue();
95 while (num-- > 0) {
96 Node c = popNode();
97 c.jjtSetParent(n);
98 n.jjtAddChild(c, num);
99 }
100 n.jjtClose();
101 pushNode(n);
102 node_created = true;
103 }
104
105
106
107
108
109
110 void closeNodeScope(Node n, boolean condition) {
111 if (condition) {
112 int a = nodeArity();
113 mk = ((Integer) marks.pop()).intValue();
114 while (a-- > 0) {
115 Node c = popNode();
116 c.jjtSetParent(n);
117 n.jjtAddChild(c, a);
118 }
119 n.jjtClose();
120 pushNode(n);
121 node_created = true;
122 } else {
123 mk = ((Integer) marks.pop()).intValue();
124 node_created = false;
125 }
126 }
127 }