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-- tolua: function class
-- Written by Waldemar Celes
-- TeCGraf/PUC-Rio
-- Jul 1998
-- $Id: function.lua,v 1.2 2001/11/26 23:00:23 darkgod 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.
-- Function class
-- Represents a function or a class method.
-- The following fields are stored:
-- mod = type modifiers
-- type = type
-- ptr = "*" or "&", if representing a pointer or a reference
-- name = name
-- args = list of argument declarations
-- const = if it is a method receiving a const "this".
classFunction = {
mod = '',
type = '',
ptr = '',
name = '',
args = {n=0},
const = '',
_base = classFeature,
}
settag(classFunction,tolua_tag)
-- declare tags
function classFunction:decltag ()
self.itype,self.tag = tagvar(self.type,strfind(self.mod,'const'))
local i=1
while self.args[i] do
self.args[i]:decltag()
i = i+1
end
end
-- Write binding function
-- Outputs C/C++ binding function.
function classFunction:supcode ()
local nret = 0 -- number of returned values
local class = self:inclass()
local _,_,static = strfind(self.mod,'^%s*(static)')
if class then
output("/* method:",self.name," of class ",class," */")
else
output("/* function:",self.name," */")
end
output("static int",self.cname,"(lua_State* tolua_S)")
output("{")
-- check types
output(' if (\n')
-- check self
local narg
if class then narg=2 else narg=1 end
if class and self.name~='new' and static==nil then
if self.const == 'const' then
output(' !tolua_istype(tolua_S,1,',self.parent.ctag,',0) ||\n')
else
output(' !tolua_istype(tolua_S,1,',self.parent.tag,',0) ||\n')
end
end
-- check args
if self.args[1].type ~= 'void' then
local i=1
while self.args[i] do
if isbasic(self.args[i].type) ~= 'value' then
output(' !'..self.args[i]:outchecktype(narg)..' ||\n')
end
narg = narg+1
i = i+1
end
end
-- check end of list
output(' !tolua_isnoobj(tolua_S,'..narg..')\n )\n goto tolua_lerror;')
output(' else\n {')
-- declare self, if the case
local narg
if class then narg=2 else narg=1 end
if class and self.name~='new' and static==nil then
output(' ',self.const,class,'*','self = ')
output('(',self.const,class,'*) ')
output('tolua_getusertype(tolua_S,1,0);')
elseif static then
_,_,self.mod = strfind(self.mod,'^%s*static%s%s*(.*)')
end
-- declare parameters
if self.args[1].type ~= 'void' then
local i=1
while self.args[i] do
self.args[i]:declare(narg)
narg = narg+1
i = i+1
end
end
-- check self
if class and self.name~='new' and static==nil then
output(' if (!self) tolua_error(tolua_S,"invalid \'self\' in function \''..self.name..'\'");');
end
-- get array element values
if class then narg=2 else narg=1 end
if self.args[1].type ~= 'void' then
local i=1
while self.args[i] do
self.args[i]:getarray(narg)
narg = narg+1
i = i+1
end
end
-- call function
if class and self.name=='delete' then
output(' delete self;')
elseif class and self.name == 'operator&[]' then
output(' self->operator[](',self.args[1].name,') = ',self.args[2].name,';')
else
output(' {')
if self.type ~= '' and self.type ~= 'void' then
output(' ',self.mod,self.type,self.ptr,'toluaI_ret = ')
output('(',self.mod,self.type,self.ptr,') ')
else
output(' ')
end
if class and self.name=='new' then
output('new',class,'(')
elseif class and static then
output(class..'::'..self.name,'(')
elseif class then
output('self->'..self.name,'(')
else
output(self.name,'(')
end
-- write parameters
local i=1
while self.args[i] do
self.args[i]:passpar()
i = i+1
if self.args[i] then
output(',')
end
end
output(');')
-- return values
if self.type ~= '' and self.type ~= 'void' then
nret = nret + 1
local t,ct = isbasic(self.type)
if t then
output(' tolua_push'..t..'(tolua_S,(',ct,')toluaI_ret);')
else
if self.ptr == '' then
output(' {')
output('#ifdef __cplusplus\n')
output(' void* toluaI_clone = new',self.type,'(toluaI_ret);')
output('#else\n')
output(' void* toluaI_clone = tolua_copy(tolua_S,(void*)&toluaI_ret,sizeof(',self.type,'));')
output('#endif\n')
output(' tolua_pushusertype(tolua_S,tolua_doclone(tolua_S,toluaI_clone,',self.tag,'),',self.tag,');')
output(' }')
--output(' tolua_pushclone((void*)&toluaI_ret,sizeof(',self.type,'),',self.tag,');')
elseif self.ptr == '&' then
output(' tolua_pushusertype(tolua_S,(void*)&toluaI_ret,',self.tag,');')
else
output(' tolua_pushusertype(tolua_S,(void*)toluaI_ret,',self.tag,');')
end
end
end
local i=1
while self.args[i] do
nret = nret + self.args[i]:retvalue()
i = i+1
end
output(' }')
-- set array element values
if class then narg=2 else narg=1 end
if self.args[1].type ~= 'void' then
local i=1
while self.args[i] do
self.args[i]:setarray(narg)
narg = narg+1
i = i+1
end
end
-- free dynamically allocated array
if self.args[1].type ~= 'void' then
local i=1
while self.args[i] do
self.args[i]:freearray()
i = i+1
end
end
end
output(' }')
output(' return '..nret..';')
-- call overloaded function or generate error
output('tolua_lerror:\n')
local overload = strsub(self.cname,-2,-1) - 1
if overload >= 0 then
output(' return '..strsub(self.cname,1,-3)..format("%02d",overload)..'(tolua_S);')
else
output(' tolua_error(tolua_S,"#ferror in function \''..self.lname..'\'.");')
output(' return 0;')
end
output('}')
output('\n')
end
-- register function
function classFunction:register ()
local parent = self:inclass() or self:inmodule()
if parent then
output(' tolua_function(tolua_S,"'..parent..'","'..self.lname..'",'..self.cname..');')
else
output(' tolua_function(tolua_S,NULL,"'..self.lname..'",'..self.cname..');')
end
end
-- unregister function
function classFunction:unregister ()
if self:inclass()==nil and self:inmodule()==nil then
output(' lua_pushnil(tolua_S); lua_setglobal(tolua_S,"'..self.lname..'");')
end
end
-- Print method
function classFunction:print (ident,close)
print(ident.."Function{")
print(ident.." mod = '"..self.mod.."',")
print(ident.." type = '"..self.type.."',")
print(ident.." ptr = '"..self.ptr.."',")
print(ident.." name = '"..self.name.."',")
print(ident.." const = '"..self.const.."',")
print(ident.." cname = '"..self.cname.."',")
print(ident.." lname = '"..self.lname.."',")
print(ident.." args = {")
local i=1
while self.args[i] do
self.args[i]:print(ident.." ",",")
i = i+1
end
print(ident.." }")
print(ident.."}"..close)
end
-- determine lua function name overload
function classFunction:overload ()
return self.parent:overload(self.lname)
end
-- Internal constructor
function _Function (t)
t._base = classFunction
settag(t,tolua_tag)
if t.const ~= 'const' and t.const ~= '' then
error("#invalid 'const' specification")
end
append(t)
if t:inclass() then
if t.name == t.parent.name then
t.name = 'new'
t.lname = 'new'
t.type = t.parent.name
t.ptr = '*'
elseif t.name == '~'..t.parent.name then
t.name = 'delete'
t.lname = 'delete'
end
end
t.cname = t:cfuncname("toluaI")..t:overload(t)
return t
end
-- Constructor
-- Expects three strings: one representing the function declaration,
-- another representing the argument list, and the third representing
-- the "const" or empty string.
function Function (d,a,c)
local t = split(strsub(a,2,-2),',') -- eliminate braces
local i=1
local l = {n=0}
while t[i] do
l.n = l.n+1
l[l.n] = Declaration(t[i],'var')
i = i+1
end
local f = Declaration(d,'func')
f.args = l
f.const = c
return _Function(f)
end
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