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Java > Open Source Codes > net > sourceforge > pmd > ast > JJTJavaParserState


1 /* Generated By:JJTree: Do not edit this line. C:/data/pmd/pmd/src/net/sourceforge/pmd/ast\JJTJavaParserState.java */
2
3 package net.sourceforge.pmd.ast;
4
5 class JJTJavaParserState {
6     private java.util.Stack JavaDoc nodes;
7     private java.util.Stack JavaDoc marks;
8
9     private int sp; // number of nodes on stack
10 private int mk; // current mark
11 private boolean node_created;
12
13     JJTJavaParserState() {
14         nodes = new java.util.Stack JavaDoc();
15         marks = new java.util.Stack JavaDoc();
16         sp = 0;
17         mk = 0;
18     }
19
20     /* Determines whether the current node was actually closed and
21        pushed. This should only be called in the final user action of a
22        node scope. */
23     boolean nodeCreated() {
24         return node_created;
25     }
26
27     /* Call this to reinitialize the node stack. It is called
28        automatically by the parser's ReInit() method. */
29     void reset() {
30         nodes.removeAllElements();
31         marks.removeAllElements();
32         sp = 0;
33         mk = 0;
34     }
35
36     /* Returns the root node of the AST. It only makes sense to call
37        this after a successful parse. */
38     Node rootNode() {
39         return (Node) nodes.elementAt(0);
40     }
41
42     /* Pushes a node on to the stack. */
43     void pushNode(Node n) {
44         nodes.push(n);
45         ++sp;
46     }
47
48     /* Returns the node on the top of the stack, and remove it from the
49        stack. */
50     Node popNode() {
51         if (--sp < mk) {
52             mk = ((Integer JavaDoc) marks.pop()).intValue();
53         }
54         return (Node) nodes.pop();
55     }
56
57     /* Returns the node currently on the top of the stack. */
58     Node peekNode() {
59         return (Node) nodes.peek();
60     }
61
62     /* Returns the number of children on the stack in the current node
63        scope. */
64     int nodeArity() {
65         return sp - mk;
66     }
67
68
69     void clearNodeScope(Node n) {
70         while (sp > mk) {
71             popNode();
72         }
73         mk = ((Integer JavaDoc) marks.pop()).intValue();
74     }
75
76
77     void openNodeScope(Node n) {
78         marks.push(new Integer JavaDoc(mk));
79         mk = sp;
80         n.jjtOpen();
81     }
82
83
84     /* A definite node is constructed from a specified number of
85        children. That number of nodes are popped from the stack and
86        made the children of the definite node. Then the definite node
87        is pushed on to the stack. */
88     void closeNodeScope(Node n, int num) {
89         mk = ((Integer JavaDoc) marks.pop()).intValue();
90         while (num-- > 0) {
91             Node c = popNode();
92             c.jjtSetParent(n);
93             n.jjtAddChild(c, num);
94         }
95         n.jjtClose();
96         pushNode(n);
97         node_created = true;
98     }
99
100
101     /* A conditional node is constructed if its condition is true. All
102        the nodes that have been pushed since the node was opened are
103        made children of the the conditional node, which is then pushed
104        on to the stack. If the condition is false the node is not
105        constructed and they are left on the stack. */
106     void closeNodeScope(Node n, boolean condition) {
107         if (condition) {
108             int a = nodeArity();
109             mk = ((Integer JavaDoc) marks.pop()).intValue();
110             while (a-- > 0) {
111                 Node c = popNode();
112                 c.jjtSetParent(n);
113                 n.jjtAddChild(c, a);
114             }
115             n.jjtClose();
116             pushNode(n);
117             node_created = true;
118         } else {
119             mk = ((Integer JavaDoc) marks.pop()).intValue();
120             node_created = false;
121         }
122     }
123 }
124
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