diff options
Diffstat (limited to 'src/FbTk')
-rw-r--r-- | src/FbTk/LuaUtil.cc | 104 | ||||
-rw-r--r-- | src/FbTk/LuaUtil.hh | 78 | ||||
-rw-r--r-- | src/FbTk/Makefile.am | 1 |
3 files changed, 183 insertions, 0 deletions
diff --git a/src/FbTk/LuaUtil.cc b/src/FbTk/LuaUtil.cc new file mode 100644 index 0000000..456abac --- /dev/null +++ b/src/FbTk/LuaUtil.cc | |||
@@ -0,0 +1,104 @@ | |||
1 | // LuaUtil: Various additional functions for working with lua | ||
2 | // Copyright (C) 2011 Pavel Labath | ||
3 | // | ||
4 | // Permission is hereby granted, free of charge, to any person obtaining a | ||
5 | // copy of this software and associated documentation files (the "Software"), | ||
6 | // to deal in the Software without restriction, including without limitation | ||
7 | // the rights to use, copy, modify, merge, publish, distribute, sublicense, | ||
8 | // and/or sell copies of the Software, and to permit persons to whom the | ||
9 | // Software is furnished to do so, subject to the following conditions: | ||
10 | // | ||
11 | // The above copyright notice and this permission notice shall be included in | ||
12 | // all copies or substantial portions of the Software. | ||
13 | // | ||
14 | // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
15 | // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
16 | // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | ||
17 | // THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
18 | // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING | ||
19 | // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER | ||
20 | // DEALINGS IN THE SOFTWARE. | ||
21 | |||
22 | #ifdef HAVE_CONFIG_H | ||
23 | #include "config.h" | ||
24 | #endif | ||
25 | |||
26 | #include "LuaUtil.hh" | ||
27 | |||
28 | namespace { | ||
29 | int newindexDenyWrite(lua::state *l) { | ||
30 | if(l->isstring(-2)) | ||
31 | throw std::runtime_error("Cannot modify field '" + l->tostring(-2) + "'."); | ||
32 | else | ||
33 | throw std::runtime_error("Cannot modify this field."); | ||
34 | } | ||
35 | |||
36 | int newindexDenyModify(lua::state *l) { | ||
37 | bool ok = false; | ||
38 | l->getmetatable(-1); { | ||
39 | l->rawgetfield(-1, "__index"); { | ||
40 | l->pushvalue(-4); l->rawget(-2); { | ||
41 | if(l->isnil(-1)) | ||
42 | ok = true; | ||
43 | } l->pop(); | ||
44 | } l->pop(); | ||
45 | } l->pop(); | ||
46 | |||
47 | if(ok) { | ||
48 | l->pushvalue(-2); | ||
49 | l->pushvalue(-4); | ||
50 | l->rawset(-3); | ||
51 | } else | ||
52 | newindexDenyWrite(l); | ||
53 | |||
54 | return 0; | ||
55 | } | ||
56 | } | ||
57 | |||
58 | namespace FbTk { | ||
59 | |||
60 | Lua::InitFunctions Lua::s_init_functions; | ||
61 | |||
62 | Lua::Lua() { | ||
63 | InitFunctions::const_iterator it_end = s_init_functions.end(); | ||
64 | for(InitFunctions::const_iterator it = s_init_functions.begin(); it != it_end; ++it) | ||
65 | (**it)(*this); | ||
66 | } | ||
67 | |||
68 | void Lua::makeReadOnly(int index, bool only_existing_fields) { | ||
69 | checkstack(6); | ||
70 | lua::stack_sentry s(*this); | ||
71 | index = absindex(index); | ||
72 | |||
73 | newtable(); { | ||
74 | newtable(); { | ||
75 | pushnil(); while(next(index)) { | ||
76 | pushvalue(-2); pushvalue(-2); rawset(-5); | ||
77 | |||
78 | pop(); pushnil(); rawset(index); | ||
79 | |||
80 | pushnil(); | ||
81 | } | ||
82 | } rawsetfield(-2, "__index"); | ||
83 | |||
84 | pushfunction(only_existing_fields ? &newindexDenyModify : &newindexDenyWrite); | ||
85 | rawsetfield(-2, "__newindex"); | ||
86 | |||
87 | pushboolean(false); | ||
88 | rawsetfield(-2, "__metatable"); | ||
89 | } setmetatable(index); | ||
90 | } | ||
91 | |||
92 | void Lua::readOnlySet(int index) { | ||
93 | checkstack(2); | ||
94 | lua::stack_sentry s(*this, -2); | ||
95 | |||
96 | getmetatable(index); { | ||
97 | rawgetfield(-1, "__index"); insert(-4); | ||
98 | } pop(); | ||
99 | |||
100 | rawset(-3); | ||
101 | pop(); | ||
102 | } | ||
103 | |||
104 | } // namespace FbTk | ||
diff --git a/src/FbTk/LuaUtil.hh b/src/FbTk/LuaUtil.hh new file mode 100644 index 0000000..cdd1934 --- /dev/null +++ b/src/FbTk/LuaUtil.hh | |||
@@ -0,0 +1,78 @@ | |||
1 | // LuaUtil: Various additional functions for working with lua | ||
2 | // Copyright (C) 2011 Pavel Labath | ||
3 | // | ||
4 | // Permission is hereby granted, free of charge, to any person obtaining a | ||
5 | // copy of this software and associated documentation files (the "Software"), | ||
6 | // to deal in the Software without restriction, including without limitation | ||
7 | // the rights to use, copy, modify, merge, publish, distribute, sublicense, | ||
8 | // and/or sell copies of the Software, and to permit persons to whom the | ||
9 | // Software is furnished to do so, subject to the following conditions: | ||
10 | // | ||
11 | // The above copyright notice and this permission notice shall be included in | ||
12 | // all copies or substantial portions of the Software. | ||
13 | // | ||
14 | // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
15 | // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
16 | // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | ||
17 | // THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
18 | // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING | ||
19 | // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER | ||
20 | // DEALINGS IN THE SOFTWARE. | ||
21 | |||
22 | #ifndef FBTK_LUAUTIL_HH | ||
23 | #define FBTK_LUAUTIL_HH | ||
24 | |||
25 | #include <vector> | ||
26 | |||
27 | #include "Luamm.hh" | ||
28 | |||
29 | namespace FbTk { | ||
30 | |||
31 | /* | ||
32 | * This class augments lua::state with additional functions/features. Every object automatically | ||
33 | * calls registered init functions, which can be used to initialize/create global variables in | ||
34 | * the lua state. Functions can be registered by calling registerInitFunction or by creating | ||
35 | * objects of type RegisterInitFunction. | ||
36 | */ | ||
37 | class Lua: public lua::state { | ||
38 | public: | ||
39 | Lua(); | ||
40 | |||
41 | /* | ||
42 | * makeReadOnly() makes the table at the specified index "read only". This means that any | ||
43 | * attempt to modify a table entry will result in an error (if only_existing_fields is | ||
44 | * false). If only_existing_fields is true then only fields that were present at the time of | ||
45 | * the call will be protected - user can add new entries and modify them afterwards. You | ||
46 | * should avoid raw access to "read only" tables -- it might not do what you think it will. | ||
47 | */ | ||
48 | void makeReadOnly(int index, bool only_existing_fields = false); | ||
49 | |||
50 | /* | ||
51 | * readOnlySet() is the equivalent of settable, except that it works on "read only" tables. | ||
52 | * It can be used to modify protected entries or create new ones. | ||
53 | */ | ||
54 | void readOnlySet(int index); | ||
55 | |||
56 | template<typename Functor> | ||
57 | static void registerInitFunction(const Functor &fn) { | ||
58 | s_init_functions.push_back(new SlotImpl<Functor, void, Lua &>(fn)); | ||
59 | } | ||
60 | |||
61 | class RegisterInitFunction { | ||
62 | public: | ||
63 | template<typename Functor> | ||
64 | RegisterInitFunction(const Functor &fn) { | ||
65 | registerInitFunction(fn); | ||
66 | } | ||
67 | }; | ||
68 | |||
69 | private: | ||
70 | typedef Slot<void, Lua &> InitFunction; | ||
71 | typedef std::vector<InitFunction *> InitFunctions; | ||
72 | |||
73 | static InitFunctions s_init_functions; | ||
74 | }; | ||
75 | |||
76 | } // namespace FbTk | ||
77 | |||
78 | #endif // FBTK_LUAUTIL_HH | ||
diff --git a/src/FbTk/Makefile.am b/src/FbTk/Makefile.am index 40587b7..f2d4ee0 100644 --- a/src/FbTk/Makefile.am +++ b/src/FbTk/Makefile.am | |||
@@ -68,6 +68,7 @@ libFbTk_a_SOURCES = App.hh App.cc Color.cc Color.hh Command.hh \ | |||
68 | Util.hh \ | 68 | Util.hh \ |
69 | RelCalcHelper.hh RelCalcHelper.cc \ | 69 | RelCalcHelper.hh RelCalcHelper.cc \ |
70 | Luamm.cc Luamm.hh LResource.cc LResource.hh LResourceHelper-lua.cc \ | 70 | Luamm.cc Luamm.hh LResource.cc LResource.hh LResourceHelper-lua.cc \ |
71 | LuaUtil.cc LuaUtil.hh \ | ||
71 | ${xpm_SOURCE} \ | 72 | ${xpm_SOURCE} \ |
72 | ${xft_SOURCE} \ | 73 | ${xft_SOURCE} \ |
73 | ${xmb_SOURCE} \ | 74 | ${xmb_SOURCE} \ |