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File: Synopsis/Linker/EmptyNS.py
1| # $Id: EmptyNS.py,v 1.1 2002/08/23 04:37:26 chalky Exp $
2| #
3| # This file is a part of Synopsis.
4| # Copyright (C) 2000, 2001 Stefan Seefeld
5| # Copyright (C) 2000, 2001 Stephen Davies
6| #
7| # Synopsis is free software; you can redistribute it and/or modify it
8| # under the terms of the GNU General Public License as published by
9| # the Free Software Foundation; either version 2 of the License, or
10| # (at your option) any later version.
11| #
12| # This program is distributed in the hope that it will be useful,
13| # but WITHOUT ANY WARRANTY; without even the implied warranty of
14| # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15| # General Public License for more details.
16| #
17| # You should have received a copy of the GNU General Public License
18| # along with this program; if not, write to the Free Software
19| # Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
20| # 02111-1307, USA.
21| #
22| # $Log: EmptyNS.py,v $
23| # Revision 1.1 2002/08/23 04:37:26 chalky
24| # Huge refactoring of Linker to make it modular, and use a config system similar
25| # to the HTML package
26| #
27|
28| import string
29|
30| from Synopsis.Core import AST, Type, Util
31|
32| from Linker import config, Operation
33|
34| class EmptyNS (Operation, AST.Visitor):
35| """A class that removes empty namespaces"""
36| def __init__(self):
37| """Overrides the default processAll() to setup the stack"""
38| self.__scopestack = []
39| self.__currscope = []
40| def execute(self, ast):
41| declarations = ast.declarations()
42| for decl in declarations:
43| decl.accept(self)
44| declarations[:] = self.__currscope
45| def push(self):
46| """Pushes the current scope onto the stack and starts a new one"""
47| self.__scopestack.append(self.__currscope)
48| self.__currscope = []
49| def pop(self, decl):
50| """Pops the current scope from the stack, and appends the given
51| declaration to it"""
52| self.__currscope = self.__scopestack.pop()
53| self.__currscope.append(decl)
54| def pop_only(self):
55| """Only pops, doesn't append to scope"""
56| self.__currscope = self.__scopestack.pop()
57| def add(self, decl):
58| """Adds the given decl to the current scope"""
59| self.__currscope.append(decl)
60| def currscope(self):
61| """Returns the current scope: a list of declarations"""
62| return self.__currscope
63| def visitDeclaration(self, decl):
64| """Adds declaration to scope"""
65| self.add(decl)
66| def visitGroup(self, group):
67| """Overrides recursive behaviour to just add the group"""
68| self.add(group)
69| def visitEnum(self, enum):
70| """Overrides recursive behaviour to just add the enum"""
71| self.add(enum)
72| def visitModule(self, module):
73| """Visits all children of the module, and if there are no declarations
74| after that removes the module"""
75| self.push()
76| for decl in module.declarations(): decl.accept(self)
77| module.declarations()[:] = self.currscope()
78| count = self._count_not_forwards(self.currscope())
79| #print string.join(module.name(),'::'),"%d (%d)"%(len(self.currscope()),count),"children"
80| if count: self.pop(module)
81| else: self.pop_only()
82| def _count_not_forwards(self, decls):
83| """Returns the number of declarations not instances of AST.Forward"""
84| count = 0
85| for decl in decls:
86| if not isinstance(decl, AST.Forward): count = count+1
87| return count
88|
89| linkerOperation = EmptyNS