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

-- tolua: class 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.


-- Class class
-- Represents a class definition.
-- Stores the following fields:
--    name = class name
--    base = class base, if any (only single inheritance is supported)
--    {i}  = list of members
classClass = {
    classtype = 'class',
    name = '',
    base = '',
    type = '',
    btype = '',
    ctype = '',
}
classClass.__index = classClass
setmetatable(classClass,classContainer)


-- register class
function classClass:register (pre)
    if not self:check_public_access() then
        return
    end

    pre = pre or ''
    push(self)
    if _collect[self.type] then
        output(pre,'#ifdef __cplusplus\n')
        output(pre..'tolua_cclass(tolua_S,"'..self.lname..'","'..self.type..'","'..self.btype..'",'.._collect[self.type]..');')
        output(pre,'#else\n')
        output(pre..'tolua_cclass(tolua_S,"'..self.lname..'","'..self.type..'","'..self.btype..'",NULL);')
        output(pre,'#endif\n')
    else
        output(pre..'tolua_cclass(tolua_S,"'..self.lname..'","'..self.type..'","'..self.btype..'",NULL);')
    end
    if self.extra_bases then
        for k,base in ipairs(self.extra_bases) do
            -- not now
            --output(pre..' tolua_addbase(tolua_S, "'..self.type..'", "'..base..'");')
        end
    end
    output(pre..'tolua_beginmodule(tolua_S,"'..self.lname..'");')
    local i=1
    while self[i] do
        self[i]:register(pre..' ')
        i = i+1
    end
    output(pre..'tolua_endmodule(tolua_S);')
    pop()
end

-- return collection requirement
function classClass:requirecollection (t)
    if self.flags.protected_destructor then
        return false
    end
    push(self)
    local r = false
    local i=1
    while self[i] do
        r = self[i]:requirecollection(t) or r
        i = i+1
    end
    pop()
    -- only class that exports destructor can be appropriately collected
    -- classes that export constructors need to have a collector (overrided by -D flag on command line)
    if self._delete or ((not flags['D']) and self._new) then
        --t[self.type] = "tolua_collect_" .. gsub(self.type,"::","_")
        t[self.type] = "tolua_collect_" .. clean_template(self.type)
        r = true
    end
    return r
end

-- output tags
function classClass:decltype ()
    push(self)
    self.type = regtype(self.original_name or self.name)
    self.btype = typevar(self.base)
    self.ctype = 'const '..self.type
    if self.extra_bases then
        for i=1,table.getn(self.extra_bases) do
            self.extra_bases[i] = typevar(self.extra_bases[i])
        end
    end
    local i=1
    while self[i] do
        self[i]:decltype()
        i = i+1
    end
    pop()
end


-- Print method
function classClass:print (ident,close)
    print(ident.."Class{")
    print(ident.." name = '"..self.name.."',")
    print(ident.." base = '"..self.base.."';")
    print(ident.." lname = '"..self.lname.."',")
    print(ident.." type = '"..self.type.."',")
    print(ident.." btype = '"..self.btype.."',")
    print(ident.." ctype = '"..self.ctype.."',")
    local i=1
    while self[i] do
        self[i]:print(ident.." ",",")
        i = i+1
    end
    print(ident.."}"..close)
end

function classClass:set_protected_destructor(p)
self.flags.protected_destructor = self.flags.protected_destructor or p
end

-- Internal constructor
function _Class (t)
    setmetatable(t,classClass)
    t:buildnames()
    append(t)
    return t
end

-- Constructor
-- Expects the name, the base (array) and the body of the class.
function Class (n,p,b)

    if table.getn(p) > 1 then
        b = string.sub(b, 1, -2)
        for i=2,table.getn(p),1 do
            b = b.."\n tolua_inherits "..p[i].." __"..p[i].."__;\n"
        end
        b = b.."\n}"
    end

    -- check for template
    b = string.gsub(b, "^{%s*TEMPLATE_BIND", "{\nTOLUA_TEMPLATE_BIND")
    local t,_,T,I = string.find(b, "^{%s*TOLUA_TEMPLATE_BIND%s*%(+%s*\"?([^\",]*)\"?%s*,%s*([^%)]*)%s*%)+")
    if t then

        -- remove quotes
        I = string.gsub(I, "\"", "")
        T = string.gsub(T, "\"", "")
        -- get type list
        local types = split_c_tokens(I, ",")
        -- remove TEMPLATE_BIND line
        local bs = string.gsub(b, "^{%s*TOLUA_TEMPLATE_BIND[^\n]*\n", "{\n")

        -- replace
        for i =1 , types.n do

            local Tl = split(T, " ")
            local Il = split_c_tokens(types[i], " ")
            local bI = bs
            local pI = {}
            for j = 1,Tl.n do
                Tl[j] = findtype(Tl[j]) or Tl[j]
                bI = string.gsub(bI, "([^_%w])"..Tl[j].."([^_%w])", "%1"..Il[j].."%2")
                if p then
                    for i=1,table.getn(p) do
                        pI[i] = string.gsub(p[i], "([^_%w]?)"..Tl[j].."([^_%w]?)", "%1"..Il[j].."%2")
                    end
                end
            end
            --local append = "<"..string.gsub(types[i], "%s+", ",")..">"
            local append = "<"..concat(Il, 1, table.getn(Il), ",")..">"
            append = string.gsub(append, "%s*,%s*", ",")
            append = string.gsub(append, ">>", "> >")
            for i=1,table.getn(pI) do
                --pI[i] = string.gsub(pI[i], ">>", "> >")
                pI[i] = resolve_template_types(pI[i])
            end
            bI = string.gsub(bI, ">>", "> >")
            Class(n..append, pI, bI)
        end
        return
    end

    local mbase

    if p then
        mbase = table.remove(p, 1)
        if not p[1] then p = nil end
    end

    mbase = mbase and resolve_template_types(mbase)

    local c
    local oname = string.gsub(n, "@.*$", "")
    oname = getnamespace(classContainer.curr)..oname

    if _global_classes[oname] then
        c = _global_classes[oname]
        if mbase and ((not c.base) or c.base == "") then
            c.base = mbase
        end
    else
        c = _Class(_Container{name=n, base=mbase, extra_bases=p})

        local ft = getnamespace(c.parent)..c.original_name
        append_global_type(ft, c)
    end

    push(c)
    c:parse(strsub(b,2,strlen(b)-1)) -- eliminate braces
    pop()
end