1 /**
2 * Redistribution and use in source and binary forms, with or without
3 * modification, are permitted provided that the following conditions are
4 * met :
5 *
6 * . Redistributions of source code must retain the above copyright
7 * notice, this list of conditions and the following disclaimer.
8 *
9 * . Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * . The name of the author may not be used to endorse or promote products
14 * derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
18 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
19 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
20 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
21 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
22 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
24 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
25 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 package cppast;
30
31 /**
32 * Manages the symbol table and scopes.
33 *
34 * @author Mathieu Champlon
35 */
36 public final class SymbolTable
37 {
38 private final Scope root;
39 private Scope current;
40
41 /**
42 * Creates a symbol table.
43 */
44 public SymbolTable()
45 {
46 root = new Scope();
47 current = root;
48 }
49
50 /**
51 * Opens a scope of a given name.
52 *
53 * @param name a non-null scope name
54 */
55 public void openScope( final String name )
56 {
57 final Scope scope = current.getScope( name );
58 if( scope != null )
59 current = scope;
60 else
61 current = current.createScope( name );
62 }
63
64 /**
65 * Close current scope.
66 */
67 public void closeScope()
68 {
69 current = current.close();
70 }
71
72 /**
73 * Close all scopes.
74 */
75 public void closeScopes()
76 {
77 current = root;
78 }
79
80 public Scope getCurrentScope()
81 {
82 return current;
83 }
84
85 /**
86 * Extend the current scope with another scope.
87 *
88 * @param name the name of the extension scope
89 */
90 public void extend( final String name )
91 {
92 current.extend( getScope( name ) );
93 }
94
95 private Scope getScope( final String name )
96 {
97 if( name == null )
98 return null;
99 if( name.indexOf( "::" ) == 0 )
100 return root.getScope( name.substring( 2 ) );
101 return current.getScope( name );
102 }
103 }