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-- tolua: variable class
-- Written by Waldemar Celes
-- TeCGraf/PUC-Rio
-- Jul 1998
-- $Id: variable.lua,v 1.4 2004/06/04 13:42:10 neil Exp $
-- This code is free software; you can redistribute it and/or modify it.
-- The software provided hereunder is on an "as is" basis, and
-- the author has no obligation to provide maintenance, support, updates,
-- enhancements, or modifications.
-- Variable class
-- Represents a extern variable or a public member of a class.
-- Stores all fields present in a declaration.
classVariable = {
_base = classDeclaration,
}
settag(classVariable,tolua_tag)
-- Print method
function classVariable:print (ident,close)
print(ident.."Variable{")
print(ident.." mod = '"..self.mod.."',")
print(ident.." type = '"..self.type.."',")
print(ident.." ptr = '"..self.ptr.."',")
print(ident.." name = '"..self.name.."',")
print(ident.." def = '"..self.def.."',")
print(ident.." ret = '"..self.ret.."',")
print(ident.."}"..close)
end
-- get variable value
function classVariable:getvalue (class,static)
if class and static then
return class..'::'..self.name
elseif class then
return 'self->'..self.name
else
return self.name
end
end
-- Write binding functions
function classVariable:supcode ()
local class = self:inclass()
-- get function ------------------------------------------------
if class then
output("/* get function:",self.name," of class ",class," */")
else
output("/* get function:",self.name," */")
end
self.cgetname = self:cfuncname("toluaI_get")
output("static int",self.cgetname,"(lua_State* tolua_S)")
output("{")
-- declare self, if the case
local _,_,static = strfind(self.mod,'^%s*(static)')
if class and static==nil then
output(' ',class,'*','self = ')
output('(',class,'*) ')
output('tolua_getusertype(tolua_S,1,0);')
elseif static then
_,_,self.mod = strfind(self.mod,'^%s*static%s%s*(.*)')
end
-- check self value
if class and static==nil then
output(' if (!self) TOLUA_ERR_SELF;');
end
-- return value
local t,ct = isbasic(self.type)
if t then
output(' tolua_push'..t..'(tolua_S,(',ct,')'..self:getvalue(class,static)..');')
else
if self.ptr == '&' or self.ptr == '' then
output(' tolua_pushusertype(tolua_S,(void*)&'..self:getvalue(class,static)..',',self.tag,');')
else
output(' tolua_pushusertype(tolua_S,(void*)'..self:getvalue(class,static)..',',self.tag,');')
end
end
output(' return 1;')
output('}')
output('\n')
-- set function ------------------------------------------------
if not strfind(self.mod,'const') then
if class then
output("/* set function:",self.name," of class ",class," */")
else
output("/* set function:",self.name," */")
end
self.csetname = self:cfuncname("toluaI_set")
output("static int",self.csetname,"(lua_State* tolua_S)")
output("{")
-- declare self, if the case
local narg=1
if class and static==nil then
output(' ',class,'*','self = ')
output('(',class,'*) ')
output('tolua_getusertype(tolua_S,1,0);')
-- check self value
output(' if (!self) TOLUA_ERR_SELF;');
narg = narg+1
elseif static then
_,_,self.mod = strfind(self.mod,'^%s*static%s%s*(.*)')
narg = narg+1
end
-- check type
output(' if (!'..self:outchecktype(narg)..')')
output(' TOLUA_ERR_ASSIGN;')
-- assign value
local ptr = ''
if self.ptr~='' then ptr = '*' end
output(' ')
if class and static then
output(class..'::'..self.name)
elseif class then
output('self->'..self.name)
else
output(self.name)
end
local t = isbasic(self.type)
output(' = ')
if not t and ptr=='' then output('*') end
output('((',self.mod,self.type)
if not t then
output('*')
end
output(') ')
local def = 0
if self.def ~= '' then def = self.def end
if t then
output('tolua_get'..t,'(tolua_S,',narg,',',def,'));')
else
output('tolua_getusertype(tolua_S,',narg,',',def,'));')
end
output(' return 0;')
output('}')
output('\n')
end
end
function classVariable:register ()
local parent = self:inclass() or self:inmodule()
if parent then
if self.csetname then
output(' tolua_tablevar(tolua_S,"'..parent..'","'..self.lname..'",'..self.cgetname..','..self.csetname..');')
else
output(' tolua_tablevar(tolua_S,"'..parent..'","'..self.lname..'",'..self.cgetname..',NULL);')
end
else
if self.csetname then
output(' tolua_globalvar(tolua_S,"'..self.lname..'",'..self.cgetname..','..self.csetname..');')
else
output(' tolua_globalvar(tolua_S,"'..self.lname..'",'..self.cgetname..',NULL);')
end
end
end
function classVariable:unregister ()
if self:inclass()==nil and self:inmodule()==nil then
output(' lua_getglobals(tolua_S);')
output(' lua_pushstring(tolua_S,"',self.lname,'"); lua_pushnil(tolua_S); lua_rawset(tolua_S,-3);')
output(' lua_pop(tolua_S,1);')
end
end
-- Internal constructor
function _Variable (t)
t._base = classVariable
settag(t,tolua_tag)
append(t)
return t
end
-- Constructor
-- Expects a string representing the variable declaration.
function Variable (s)
return _Variable (Declaration(s,'var'))
end
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