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-- tolua: declaration class
-- Written by Waldemar Celes
-- TeCGraf/PUC-Rio
-- Jul 1998
-- $Id: declaration.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.
-- Declaration class
-- Represents variable, function, or argument declaration.
-- Stores the following fields:
-- mod = type modifiers
-- type = type
-- ptr = "*" or "&", if representing a pointer or a reference
-- name = name
-- dim = dimension, if a vector
-- def = default value, if any (only for arguments)
-- ret = "*" or "&", if value is to be returned (only for arguments)
classDeclaration = {
_base = classFeature,
mod = '',
type = '',
ptr = '',
name = '',
dim = '',
ret = '',
def = ''
}
settag(classDeclaration,tolua_tag)
-- Create an unique variable name
function create_varname ()
if not _varnumber then _varnumber = 0 end
_varnumber = _varnumber + 1
return "tolua_var_".._varnumber
end
-- Check declaration name
-- It also identifies default values
function classDeclaration:checkname ()
if strsub(self.name,1,1) == '[' and not istype(self.type) then
self.name = self.type..self.name
local m = split(self.mod,'%s%s*')
self.type = m[m.n]
self.mod = concat(m,1,m.n-1)
end
local t = split(self.name,'=')
if t.n==2 then
self.name = t[1]
self.def = t[t.n]
end
local b,e,d = strfind(self.name,"%[(.-)%]")
if b then
self.name = strsub(self.name,1,b-1)
self.dim = d
end
if self.type ~= '' and self.type ~= 'void' and self.name == '' then
self.name = create_varname()
elseif self.kind=='var' then
if self.type=='' and self.name~='' then
self.type = self.type..self.name
self.name = create_varname()
elseif istype(self.name) then
if self.type=='' then self.type = self.name
else self.type = self.type..' '..self.name end
self.name = create_varname()
end
end
end
-- Check declaration type
-- Substitutes typedef's.
function classDeclaration:checktype ()
-- check if there is a pointer to basic type
if isbasic(self.type) and self.ptr~='' then
self.ret = self.ptr
self.ptr = nil
end
-- check if there is array to be returned
if self.dim~='' and self.ret~='' then
error('#invalid parameter: cannot return an array of values')
end
-- register type
if self.type~='' then
regtype(self.type)
end
-- restore 'void*' and 'string*'
if self.type == '_userdata' then self.type = 'void*'
elseif self.type == '_cstring' then self.type = 'char*'
end
--
-- -- if returning value, automatically set default value
-- if self.ret ~= '' and self.def == '' then
-- self.def = '0'
-- end
--
end
-- Print method
function classDeclaration:print (ident,close)
print(ident.."Declaration{")
print(ident.." mod = '"..self.mod.."',")
print(ident.." type = '"..self.type.."',")
print(ident.." ptr = '"..self.ptr.."',")
print(ident.." name = '"..self.name.."',")
print(ident.." dim = '"..self.dim.."',")
print(ident.." def = '"..self.def.."',")
print(ident.." ret = '"..self.ret.."',")
print(ident.."}"..close)
end
-- declare tag
function classDeclaration:decltag ()
self.itype, self.tag = tagvar(self.type,strfind(self.mod,'const'))
end
-- output type checking
function classDeclaration:outchecktype (narg)
local tag, def
if self.dim ~= '' then
tag = 'LUA_TTABLE'
def = 0
else
tag = self.tag
def = self.def~='' or 0
end
return 'tolua_istype(tolua_S,'..narg..','..tag..','..def..')'
end
-- Declare variable
function classDeclaration:declare (narg)
local ptr = ''
if self.ptr~='' then ptr = '*' end
output(" ",self.mod,self.type,ptr)
if self.dim ~= '' and tonumber(self.dim)==nil then
output('*')
end
output(self.name)
if self.dim ~= '' then
if tonumber(self.dim)~=nil then
output('[',self.dim,'];')
else
output(' = (',self.mod,self.type,ptr,'*)',
'malloc(',self.dim,'*sizeof(',self.type,ptr,'));')
end
else
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
end
end
-- Get parameter value
function classDeclaration:getarray (narg)
if self.dim ~= '' then
output(' {')
local def = self.def~='' or 0
output(' if (!tolua_arrayistype(tolua_S,',narg,',',self.tag,',',self.dim,',',def,'))')
output(' goto tolua_lerror;')
output(' else\n')
output(' {')
output(' int i;')
output(' for(i=0; i<'..self.dim..';i++)')
local t = isbasic(self.type)
local ptr = ''
if self.ptr~='' then ptr = '*' end
output(' ',self.name..'[i] = ')
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_getfield'..t..'(tolua_S,',narg,',i+1,',def,'));')
else
output('tolua_getfieldusertype(tolua_S,',narg,',i+1,',def,'));')
end
output(' }')
output(' }')
end
end
-- Get parameter value
function classDeclaration:setarray (narg)
if self.dim ~= '' then
output(' {')
output(' int i;')
output(' for(i=0; i<'..self.dim..';i++)')
local t,ct = isbasic(self.type)
if t then
output(' tolua_pushfield'..t..'(tolua_S,',narg,',i+1,(',ct,')',self.name,'[i]);')
else
if self.ptr == '' then
output(' {')
output('#ifdef __cplusplus\n')
output(' void* toluaI_clone = new',self.type,'(',self.name,'[i]);')
output('#else\n')
output(' void* toluaI_clone = tolua_copy(tolua_S,(void*)&',self.name,'[i],sizeof(',self.type,'));')
output('#endif\n')
output(' tolua_pushfieldusertype(tolua_S,',narg,',i+1,tolua_doclone(tolua_S,toluaI_clone,',self.tag,'),',self.tag,');')
output(' }')
--output(' tolua_pushfieldclone(tolua_S,',narg,',i+1,(void*)&',self.name,'[i],sizeof(',self.type,'),',self.tag,');')
else
output(' tolua_pushfieldusertype(tolua_S,',narg,',i+1,(void*)',self.name,'[i],',self.tag,');')
end
end
output(' }')
end
end
-- Free dynamically allocated array
function classDeclaration:freearray ()
if self.dim ~= '' and tonumber(self.dim)==nil then
output(' free(',self.name,');')
end
end
-- Pass parameter
function classDeclaration:passpar ()
if self.ptr=='&' then
output('*'..self.name)
elseif self.ret=='*' then
output('&'..self.name)
else
output(self.name)
end
end
-- Return parameter value
function classDeclaration:retvalue ()
if self.ret ~= '' then
local t,ct = isbasic(self.type)
if t then
output(' tolua_push'..t..'(tolua_S,(',ct,')'..self.name..');')
else
output(' tolua_pushusertype(tolua_S,(void*)'..self.name..',',self.tag,');')
end
return 1
end
return 0
end
-- Internal constructor
function _Declaration (t)
if t.name and t.name~='' then
local n = split(t.name,'@')
t.name = n[1]
t.lname = gsub(n[2] or n[1],"%[.-%]","")
end
t._base = classDeclaration
settag(t,tolua_tag)
t:checkname()
t:checktype()
return t
end
-- Constructor
-- Expects the string declaration.
-- The kind of declaration can be "var" or "func".
function Declaration (s,kind)
-- eliminate spaces if default value is provided
s = gsub(s,"%s*=%s*","=")
if kind == "var" then
-- check the form: void
if s == '' or s == 'void' then
return _Declaration{type = 'void', kind = kind}
end
end
-- check the form: mod type*& name
local t = split(s,'%*%s*&')
if t.n == 2 then
if kind == 'func' then
error("#invalid function return type: "..s)
end
local m = split(t[1],'%s%s*')
return _Declaration{
name = t[2],
ptr = '*',
ret = '&',
type = m[m.n],
mod = concat(m,1,m.n-1),
kind = kind
}
end
-- check the form: mod type** name
t = split(s,'%*%s*%*')
if t.n == 2 then
if kind == 'func' then
error("#invalid function return type: "..s)
end
local m = split(t[1],'%s%s*')
return _Declaration{
name = t[2],
ptr = '*',
ret = '*',
type = m[m.n],
mod = concat(m,1,m.n-1),
kind = kind
}
end
-- check the form: mod type& name
t = split(s,'&')
if t.n == 2 then
local m = split(t[1],'%s%s*')
return _Declaration{
name = t[2],
ptr = '&',
type = m[m.n],
mod = concat(m,1,m.n-1) ,
kind = kind
}
end
-- check the form: mod type* name
local s1 = gsub(s,"(%b\[\])",function (n) return gsub(n,'%*','\1') end)
t = split(s1,'%*')
if t.n == 2 then
t[2] = gsub(t[2],'\1','%*') -- restore * in dimension expression
local m = split(t[1],'%s%s*')
return _Declaration{
name = t[2],
ptr = '*',
type = m[m.n],
mod = concat(m,1,m.n-1) ,
kind = kind
}
end
if kind == 'var' then
-- check the form: mod type name
t = split(s,'%s%s*')
local v
if istype(t[t.n]) then v = '' else v = t[t.n]; t.n = t.n-1 end
return _Declaration{
name = v,
type = t[t.n],
mod = concat(t,1,t.n-1),
kind = kind
}
else -- kind == "func"
-- check the form: mod type name
t = split(s,'%s%s*')
local v = t[t.n] -- last word is the function name
local tp,md
if t.n>1 then
tp = t[t.n-1]
md = concat(t,1,t.n-2)
end
return _Declaration{
name = v,
type = tp,
mod = md,
kind = kind
}
end
end
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