source: code/archive/tutorial4/src/external/tolua/lua/variable.lua

-- tolua: variable class
-- Written by Waldemar Celes
-- TeCGraf/PUC-Rio
-- Jul 1998
-- $Id: $

-- 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
        if self.parent.classtype == 'class' then
            parent = "_" .. self.parent.type
        else
            parent = "_" .. p
        end
    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.lname or self.name,".*::","") .. ptr

    name = clean_template(name)
    return name

end

-- check if it is a variable
function classVariable:isvariable ()
    return true
end

-- get variable value
function classVariable:getvalue (class,static, prop_get)

    local name
    if prop_get then

        name = prop_get.."()"
    else
        name = self.name
    end

    if class and static then
        return self.parent.type..'::'..name
    elseif class then
        return 'self->'..name
    else
        return 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()

    local prop_get,prop_set
    if string.find(self.mod, 'tolua_property') then

        _,_,type = string.find(self.mod, "tolua_property__([^%s]*)")
        type = type or "default"
        prop_get,prop_set = get_property_methods(type, self.name)
        self.mod = string.gsub(self.mod, "tolua_property[^%s]*", "")
    end

    -- get function ------------------------------------------------
    if class then
        output("/* get function:",self.name," of class ",class," */")
    else
        output("/* get function:",self.name," */")
    end
    self.cgetname = self:cfuncname("tolua_get")
    output("#ifndef TOLUA_DISABLE_"..self.cgetname)
    output("\nstatic 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(' ',self.parent.type,'*','self = ')
        output('(',self.parent.type,'*) ')
        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
    if string.find(self.mod, 'tolua_inherits') then
        output('#ifdef __cplusplus\n')
        output('  tolua_pushusertype(tolua_S,(void*)static_cast<'..self.type..'*>(self), "',self.type,'");')
        output('#else\n')
        output('  tolua_pushusertype(tolua_S,(void*)(('..self.type..'*)self), "',self.type,'");')
        output('#endif\n')
    else
        local t,ct = isbasic(self.type)
        if t then
            output('  tolua_push'..t..'(tolua_S,(',ct,')'..self:getvalue(class,static,prop_get)..');')
        else
            t = self.type
            if self.ptr == '&' or self.ptr == '' then
                output('  tolua_pushusertype(tolua_S,(void*)&'..self:getvalue(class,static,prop_get)..',"',t,'");')
            else
                output('  tolua_pushusertype(tolua_S,(void*)'..self:getvalue(class,static,prop_get)..',"',t,'");')
            end
        end
    end
    output(' return 1;')
    output('}')
    output('#endif //#ifndef TOLUA_DISABLE\n')
    output('\n')

    -- set function ------------------------------------------------
    if not (strfind(self.type,'const%s+') or string.find(self.mod, 'tolua_readonly') or string.find(self.mod, 'tolua_inherits'))  then
    if class then
        output("/* set function:",self.name," of class ",class," */")
    else
        output("/* set function:",self.name," */")
    end
    self.csetname = self:cfuncname("tolua_set")
    output("#ifndef TOLUA_DISABLE_"..self.csetname)
    output("\nstatic int",self.csetname,"(lua_State* tolua_S)")
    output("{")

    -- declare self, if the case
    if class and static==nil then
        output(' ',self.parent.type,'*','self = ')
        output('(',self.parent.type,'*) ')
        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)..')')
    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(self.parent.type..'::'..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(' ')
            local name = prop_set or self.name
            if class and static then
                output(self.parent.type..'::'..name)
            elseif class then
                output('self->'..name)
            else
                output(name)
            end
            local t = isbasic(self.type)
            if prop_set then
                output('(')
            else
                output(' = ')
            end
            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
                output('tolua_to'..t,'(tolua_S,2,',def,'))')
            else
                output('tolua_tousertype(tolua_S,2,',def,'))')
            end
            if prop_set then
                output(")")
            end
            output(";")
        end
        output(' return 0;')
        output('}')
        output('#endif //#ifndef TOLUA_DISABLE\n')
        output('\n')
    end

end

function classVariable:register (pre)

    if not self:check_public_access() then
        return
    end
    pre = pre or ''
    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(pre..'tolua_variable(tolua_S,"'..self.lname..'",'..self.cgetname..','..self.csetname..');')
    else
        output(pre..'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