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-- tolua: variable class
-- Written by Waldemar Celes
-- TeCGraf/PUC-Rio
-- Jul 1998
-- $Id: variable.lua,v 1.1 2009-07-09 13:44:18 fabraham 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 = {
_get = {}, -- mapped get functions
_set = {}, -- mapped set functions
}
classVariable.__index = classVariable
setmetatable(classVariable,classDeclaration)
-- 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.."',")
if self.dim then print(ident.." dim = '"..self.dim.."',") end
print(ident.." def = '"..self.def.."',")
print(ident.." ret = '"..self.ret.."',")
print(ident.."}"..close)
end
-- Generates C function name
function classVariable:cfuncname (prefix)
local parent = ""
local unsigned = ""
local ptr = ""
local p = self:inmodule() or self:innamespace() or self:inclass()
if p then
parent = "_" .. p
end
if strfind(self.mod,"(unsigned)") then
unsigned = "_unsigned"
end
if self.ptr == "*" then ptr = "_ptr"
elseif self.ptr == "&" then ptr = "_ref"
end
local name = prefix .. parent .. unsigned .. "_" .. gsub(self.name,".*::","") .. ptr
return name
end
-- check if it is a variable
function classVariable:isvariable ()
return true
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
-- get variable pointer value
function classVariable:getpointervalue (class,static)
if class and static then
return class..'::p'
elseif class then
return 'self->p'
else
return 'p'
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," */")
self.cgetname = self:cfuncname("tolua_get_"..class)
else
output("/* get function:",self.name," */")
self.cgetname = self:cfuncname("tolua_get")
end
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_tousertype(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('#ifndef TOLUA_RELEASE\n')
output(' if (!self) tolua_error(tolua_S,"invalid \'self\' in accessing variable \''..self.name..'\'",NULL);');
output('#endif\n')
end
-- return value
local type = self.type
if gsub(type,'const ','')=='char' and self.dim~='' then
type = 'char*'
end
local t,ct = isbasic(type)
if t then
output(' tolua_push'..t..'(tolua_S,(',ct,')'..self:getvalue(class,static)..');')
else
t = self.type
if self.ptr == '&' or self.ptr == '' then
output(' tolua_pushusertype(tolua_S,(void*)&'..self:getvalue(class,static)..',"',t,'");')
else
output(' tolua_pushusertype(tolua_S,(void*)'..self:getvalue(class,static)..',"',t,'");')
end
end
output(' return 1;')
output('}')
output('\n')
-- set function ------------------------------------------------
if not strfind(self.type,'const') then
if class then
output("/* set function:",self.name," of class ",class," */")
self.csetname = self:cfuncname("tolua_set_"..class)
else
output("/* set function:",self.name," */")
self.csetname = self:cfuncname("tolua_set")
end
output("static int",self.csetname,"(lua_State* tolua_S)")
output("{")
-- declare self, if the case
if class and static==nil then
output(' ',class,'*','self = ')
output('(',class,'*) ')
output('tolua_tousertype(tolua_S,1,0);')
-- check self value
end
-- check types
output('#ifndef TOLUA_RELEASE\n')
output(' tolua_Error tolua_err;')
if class and static==nil then
output(' if (!self) tolua_error(tolua_S,"invalid \'self\' in accessing variable \''..self.name..'\'",NULL);');
elseif static then
_,_,self.mod = strfind(self.mod,'^%s*static%s%s*(.*)')
end
-- check variable type
output(' if (!'..self:outchecktype(2,true)..')')
output(' tolua_error(tolua_S,"#vinvalid type in variable assignment.",&tolua_err);')
output('#endif\n')
-- assign value
local def = 0
if self.def ~= '' then def = self.def end
if self.type == 'char' and self.dim ~= '' then -- is string
output(' strncpy(')
if class and static then
output(class..'::'..self.name)
elseif class then
output('self->'..self.name)
else
output(self.name)
end
output(',tolua_tostring(tolua_S,2,',def,'),',self.dim,'-1);')
else
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(') ')
if t then
if isenum(self.type) then
output('(int) ')
end
if t=='function' then t='value' end
output('tolua_to'..t,'(tolua_S,2,',def,'));')
else
output('tolua_tousertype(tolua_S,2,',def,'));')
end
end
output(' return 0;')
output('}')
output('\n')
end
end
function classVariable:register ()
local parent = self:inmodule() or self:innamespace() or self:inclass()
if not parent then
if classVariable._warning==nil then
warning("Mapping variable to global may degrade performance")
classVariable._warning = 1
end
end
if self.csetname then
output(' tolua_variable(tolua_S,"'..self.lname..'",'..self.cgetname..','..self.csetname..');')
else
output(' tolua_variable(tolua_S,"'..self.lname..'",'..self.cgetname..',NULL);')
end
end
-- Internal constructor
function _Variable (t)
setmetatable(t,classVariable)
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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