-- tolua: declaration 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.


-- 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 = {
    mod = '',
    type = '',
    ptr = '',
    name = '',
    dim = '',
    ret = '',
    def = ''
}
classDeclaration.__index = classDeclaration
setmetatable(classDeclaration,classFeature)

-- 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 findtype(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 = find_enum_var(t[t.n])
    end

    local b,e,d = strfind(self.name,"%[(.-)%]")
    if b then
        self.name = strsub(self.name,1,b-1)
        self.dim = find_enum_var(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 findtype(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

    -- adjust type of string
    if self.type == 'char' and self.dim ~= '' then
        self.type = 'char*'
    end

    if self.kind and self.kind == 'var' then
        self.name = string.gsub(self.name, ":.*$", "") -- ???
    end
end

-- Check declaration type
-- Substitutes typedef's.
function classDeclaration:checktype ()

    -- check if there is a pointer to basic type
    local basic = isbasic(self.type)
    if self.kind == 'func' and basic=='number' and string.find(self.ptr, "%*") then
        self.type = '_userdata'
        self.ptr = ""
    end
    if basic and self.ptr~='' then
        self.ret = self.ptr
        self.ptr = nil
        if isbasic(self.type) == 'number' then
            self.return_userdata = true
        end
    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
    -- restore 'void*' and 'string*'
    if self.type == '_userdata' then self.type = 'void*'
    elseif self.type == '_cstring' then self.type = 'char*'
    elseif self.type == '_lstate' then self.type = 'lua_State*'
    end

    -- resolve types inside the templates
    if self.type then
        self.type = resolve_template_types(self.type)
    end

    --
    -- -- if returning value, automatically set default value
    -- if self.ret ~= '' and self.def == '' then
    --  self.def = '0'
    -- end
    --

end

function resolve_template_types(type)

    if isbasic(type) then
        return type
    end
    local b,_,m = string.find(type, "(%b<>)")
    if b then

        m = split_c_tokens(string.sub(m, 2, -2), ",")
        for i=1, table.getn(m) do
            m[i] = string.gsub(m[i],"%s*([%*&])", "%1")
            m[i] = findtype(m[i]) or m[i]
            m[i] = resolve_template_types(m[i])
        end

        local b,i
        type,b,i = break_template(type)
        local template_part = "<"..string.gsub(concat(m, 1, m.n), " ", ",")..">"
        type = rebuild_template(type, b, template_part)
        type = string.gsub(type, ">>", "> >")
    end
    return type
end

function break_template(s)
    local b,e,timpl = string.find(s, "(%b<>)")
    if timpl then
        s = string.gsub(s, "%b<>", "")
        return s, b, timpl
    else
        return s, 0, nil
    end
end

function rebuild_template(s, b, timpl)

    if b == 0 then
        return s
    end

    return string.sub(s, 1, b-1)..timpl..string.sub(s, b, -1)
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

-- check if array of values are returned to Lua
function classDeclaration:requirecollection (t)
 if self.mod ~= 'const' and
        self.dim and self.dim ~= '' and
                 not isbasic(self.type) and
                 self.ptr == '' then
        local type = gsub(self.type,"%s*const%s+","")
        t[type] = "tolua_collect_" .. clean_template(type)
        return true
    end
    return false
end

-- declare tag
function classDeclaration:decltype ()

    self.type = typevar(self.type)
    if strfind(self.mod,'const') then
        self.type = 'const '..self.type
        self.mod = gsub(self.mod,'const%s*','')
    end
end


-- output type checking
function classDeclaration:outchecktype (narg)
    local def
    local t = isbasic(self.type)
    if self.def~='' then
        def = 1
    else
        def = 0
    end
    if self.dim ~= '' then
        --if t=='string' then
        --    return 'tolua_isstringarray(tolua_S,'..narg..','..def..',&tolua_err)'
        --else
        return 'tolua_istable(tolua_S,'..narg..',0,&tolua_err)'
        --end
    elseif t then
        return 'tolua_is'..t..'(tolua_S,'..narg..','..def..',&tolua_err)'
    else
        return 'tolua_isusertype(tolua_S,'..narg..',"'..self.type..'",'..def..',&tolua_err)'
    end
end

function classDeclaration:builddeclaration (narg, cplusplus)
    local array = self.dim ~= '' and tonumber(self.dim)==nil
    local line = ""
    local ptr = ''
    local mod
    local type = self.type
    if self.dim ~= '' then
        type = gsub(self.type,'const%s+','')  -- eliminates const modifier for arrays
    end
    if self.ptr~='' and not isbasic(type) then ptr = '*' end
    line = concatparam(line," ",self.mod,type,ptr)
    if array then
        line = concatparam(line,'*')
    end
    line = concatparam(line,self.name)
    if self.dim ~= '' then
        if tonumber(self.dim)~=nil then
            line = concatparam(line,'[',self.dim,'];')
        else
            if cplusplus then
                line = concatparam(line,' = new',type,ptr,'['..self.dim..'];')
            else
                line = concatparam(line,' = (',type,ptr,'*)',
                'malloc((',self.dim,')*sizeof(',type,ptr,'));')
            end
        end
    else
    local t = isbasic(type)
    line = concatparam(line,' = ')
    if t == 'state' then
        line = concatparam(line, 'tolua_S;')
    else
        --print("t is "..tostring(t)..", ptr is "..tostring(self.ptr))
        if t == 'number' and string.find(self.ptr, "%*") then
            t = 'userdata'
        end
        if not t and ptr=='' then line = concatparam(line,'*') end
            line = concatparam(line,'((',self.mod,type)
            if not t then
                line = concatparam(line,'*')
            end
            line = concatparam(line,') ')
            if isenum(type) then
                line = concatparam(line,'(int) ')
            end
            local def = 0
            if self.def ~= '' then
                def = self.def
                if (ptr == '' or self.ptr == '&') and not t then
                    def = "(void*)&(const "..type..")"..def
                end
            end
            if t then
                line = concatparam(line,'tolua_to'..t,'(tolua_S,',narg,',',def,'));')
            else
                line = concatparam(line,'tolua_tousertype(tolua_S,',narg,',',def,'));')
            end
        end
    end
    return line
end

-- Declare variable
function classDeclaration:declare (narg)
    if self.dim ~= '' and tonumber(self.dim)==nil then
        output('#ifdef __cplusplus\n')
        output(self:builddeclaration(narg,true))
        output('#else\n')
        output(self:builddeclaration(narg,false))
        output('#endif\n')
    else
        output(self:builddeclaration(narg,false))
    end
end

-- Get parameter value
function classDeclaration:getarray (narg)
    if self.dim ~= '' then
        local type = gsub(self.type,'const ','')
        output('  {')
        output('#ifndef TOLUA_RELEASE\n')
        local def; if self.def~='' then def=1 else def=0 end
        local t = isbasic(type)
        if (t) then
            output('   if (!tolua_is'..t..'array(tolua_S,',narg,',',self.dim,',',def,',&tolua_err))')
        else
            output('   if (!tolua_isusertypearray(tolua_S,',narg,',"',type,'",',self.dim,',',def,',&tolua_err))')
        end
        output('    goto tolua_lerror;')
        output('   else\n')
        output('#endif\n')
        output('   {')
        output('    int i;')
        output('    for(i=0; i<'..self.dim..';i++)')
        local t = isbasic(type)
        local ptr = ''
        if self.ptr~='' then ptr = '*' end
        output('   ',self.name..'[i] = ')
        if not t and ptr=='' then output('*') end
        output('((',type)
        if not t then
            output('*')
        end
        output(') ')
        local def = 0
        if self.def ~= '' then def = self.def end
        if t then
            output('tolua_tofield'..t..'(tolua_S,',narg,',i+1,',def,'));')
        else
            output('tolua_tofieldusertype(tolua_S,',narg,',i+1,',def,'));')
        end
        output('   }')
        output('  }')
    end
end

-- Get parameter value
function classDeclaration:setarray (narg)
    if not strfind(self.type,'const%s+') and self.dim ~= '' then
        local type = gsub(self.type,'const ','')
        output('  {')
        output('   int i;')
        output('   for(i=0; i<'..self.dim..';i++)')
        local t,ct = isbasic(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* tolua_obj = new',type,'(',self.name,'[i]);')
                output('    tolua_pushfieldusertype_and_takeownership(tolua_S,',narg,',i+1,tolua_obj,"',type,'");')
                output('#else\n')
                output('    void* tolua_obj = tolua_copy(tolua_S,(void*)&',self.name,'[i],sizeof(',type,'));')
                output('    tolua_pushfieldusertype(tolua_S,',narg,',i+1,tolua_obj,"',type,'");')
                output('#endif\n')
                output('   }')
            else
                output('   tolua_pushfieldusertype(tolua_S,',narg,',i+1,(void*)',self.name,'[i],"',type,'");')
            end
        end
        output('  }')
    end
end

-- Free dynamically allocated array
function classDeclaration:freearray ()
    if self.dim ~= '' and tonumber(self.dim)==nil then
        output('#ifdef __cplusplus\n')
        output('  delete []',self.name,';')
        output('#else\n')
        output('  free(',self.name,');')
        output('#endif\n')
    end
end

-- Pass parameter
function classDeclaration:passpar ()
    if self.ptr=='&' and not isbasic(self.type) 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 and t~='' then
            output('   tolua_push'..t..'(tolua_S,(',ct,')'..self.name..');')
        else
            output('   tolua_pushusertype(tolua_S,(void*)'..self.name..',"',self.type,'");')
        end
        return 1
    end
    return 0
end

-- Internal constructor
function _Declaration (t)

    setmetatable(t,classDeclaration)
    t:buildnames()
    t:checkname()
    t:checktype()
    local ft = findtype(t.type) or t.type
    if not isenum(ft) then
        t.mod, t.type = applytypedef(t.mod, ft)
    end

    if t.kind=="var" and (string.find(t.mod, "tolua_property%s") or string.find(t.mod, "tolua_property$")) then
        t.mod = string.gsub(t.mod, "tolua_property", "tolua_property__"..get_property_type())
    end

    return t
end

-- Constructor
-- Expects the string declaration.
-- The kind of declaration can be "var" or "func".
function Declaration (s,kind,is_parameter)

    -- eliminate spaces if default value is provided
    s = gsub(s,"%s*=%s*","=")
    s = gsub(s, "%s*<", "<")

    local defb,tmpdef
    defb,_,tmpdef = string.find(s, "(=.*)$")
    if defb then
        s = string.gsub(s, "=.*$", "")
    else
        tmpdef = ''
    end
    if kind == "var" then
        -- check the form: void
        if s == '' or s == 'void' then
            return _Declaration{type = 'void', kind = kind, is_parameter = is_parameter}
        end
    end

    -- check the form: mod type*& name
    local t = split_c_tokens(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*')
        local m = split_c_tokens(t[1],'%s+')
        return _Declaration {
            name = t[2]..tmpdef,
            ptr = '*',
            ret = '&',
            --type = rebuild_template(m[m.n], tb, timpl),
            type = m[m.n],
            mod = concat(m,1,m.n-1),
            is_parameter = is_parameter,
            kind = kind
        }
    end

    -- check the form: mod type** name
    t = split_c_tokens(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*')
        local m = split_c_tokens(t[1],'%s+')
        return _Declaration {
            name = t[2]..tmpdef,
            ptr = '*',
            ret = '*',
            --type = rebuild_template(m[m.n], tb, timpl),
            type = m[m.n],
            mod = concat(m,1,m.n-1),
            is_parameter = is_parameter,
            kind = kind
        }
    end

    -- check the form: mod type& name
    t = split_c_tokens(s,'&')
    if t.n == 2 then
        --local m = split(t[1],'%s%s*')
        local m = split_c_tokens(t[1],'%s+')
        return _Declaration {
            name = t[2]..tmpdef,
            ptr = '&',
            --type = rebuild_template(m[m.n], tb, timpl),
            type = m[m.n],
            mod = concat(m,1,m.n-1),
            is_parameter = is_parameter,
            kind = kind
        }
    end

    -- check the form: mod type* name
    local s1 = gsub(s,"(%b\[\])",function (n) return gsub(n,'%*','\1') end)
    t = split_c_tokens(s1,'%*')
    if t.n == 2 then
        t[2] = gsub(t[2],'\1','%*') -- restore * in dimension expression
        --local m = split(t[1],'%s%s*')
        local m = split_c_tokens(t[1],'%s+')
        return _Declaration {
            name = t[2]..tmpdef,
            ptr = '*',
            type = m[m.n],
            --type = rebuild_template(m[m.n], tb, timpl),
            mod = concat(m,1,m.n-1)   ,
            is_parameter = is_parameter,
            kind = kind
        }
    end

    if kind == 'var' then
        -- check the form: mod type name
        --t = split(s,'%s%s*')
        t = split_c_tokens(s,'%s+')
        local v
        if findtype(t[t.n]) then v = create_varname() else v = t[t.n]; t.n = t.n-1 end
        return _Declaration {
            name = v..tmpdef,
            --type = rebuild_template(t[t.n], tb, timpl),
            type = t[t.n],
            mod = concat(t,1,t.n-1),
            is_parameter = is_parameter,
            kind = kind
        }

    else -- kind == "func"

        -- check the form: mod type name
        --t = split(s,'%s%s*')
        t = split_c_tokens(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
        --if tp then tp = rebuild_template(tp, tb, timpl) end
        return _Declaration {
            name = v,
            type = tp,
            mod = md,
            is_parameter = is_parameter,
            kind = kind
        }
    end

end