bgfx/scripts/idl.lua

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-- Copyright 2019 云风 https://github.com/cloudwu . All rights reserved.
-- License (the same with bgfx) : https://github.com/bkaradzic/bgfx/blob/master/LICENSE
local idl = {}
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local comments = {}
function idl.comment(c)
comments[#comments+1] = c
end
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local all_types = {}
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local function copy_attribs(to, from)
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if type(from) == "table" then
for k, v in pairs(from) do
if type(k) == "number" then
to[v] = true
end
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to[k] = v
end
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else
to.value = from
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end
end
local function classdef(item, def)
local function class(_, methodname)
item.class = item.name
item.name = methodname
return def
end
return setmetatable({} , { __index = class, __call = function(_, value) return def(value) end })
end
local function new_type(typename)
local t = { name = typename }
if #comments > 0 then
t.comments = comments
comments = {}
end
all_types[#all_types+1] = t
return t
end
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local function typedef(_, typename)
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local t = new_type(typename)
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local function type_attrib(attrib)
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copy_attribs(t, attrib)
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end
return function(cname)
local typ = type(cname)
if typ == "table" then
type_attrib(cname)
return
end
assert(typ == "string" , "type should be a string")
t.cname = cname
return type_attrib
end
end
idl.typedef = setmetatable({} , { __index = typedef, __call = typedef })
idl.types = all_types
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local function add_comment(item, comment)
-- strip space
comment = comment:match "(.-)%s*$"
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if item.comment then
table.insert(item.comment, comment)
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else
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item.comment = { comment }
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end
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end
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local function enumdef(what)
local function deffunc (_, typename)
local t = new_type(typename)
t[what] = {}
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local function enum_attrib(obj, attribs)
copy_attribs(t, attribs)
return obj
end
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local function new_enum_item(_, itemname)
local item = { name = itemname }
t[what][#t[what] + 1] = item
local function add_attrib_or_comment(obj , attribs)
if type(attribs) == "string" then
add_comment(item, attribs)
elseif attribs then
copy_attribs(item, attribs)
end
return obj
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end
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return setmetatable({}, { __index = new_enum_item, __call = add_attrib_or_comment })
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end
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return setmetatable({}, { __index = new_enum_item , __call = enum_attrib })
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end
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return setmetatable({} , { __index = deffunc , __call = deffunc })
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end
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idl.enum = enumdef "enum"
idl.flag = enumdef "flag"
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local function structdef(_, typename)
local t = new_type(typename)
t.struct = {}
local function struct_attrib(obj, attribs)
copy_attribs(t, attribs)
return obj
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end
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local function new_struct_item(_, itemname)
local item = { name = itemname }
t.struct[#t.struct + 1] = item
local function item_attrib(obj, attribs)
if type(attribs) == "string" then
add_comment(item, attribs)
else
copy_attribs(item, attribs)
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end
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return obj
end
return function (itemtype)
item.fulltype = itemtype
return setmetatable({}, { __index = new_struct_item, __call = item_attrib })
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end
end
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return setmetatable({}, { __index = new_struct_item , __call = struct_attrib })
end
idl.struct = setmetatable({}, { __index = structdef , __call = structdef })
local function handledef(_, typename)
local t = new_type(typename)
t.handle = true
return function (attribs)
copy_attribs(t, attribs)
return obj
end
end
idl.handle = setmetatable({} , { __index = handledef, __call = handledef })
local all_funcs = {}
local function duplicate_arg_name(_, name)
error ("Duplicate arg name " .. name)
end
local function attribs_setter(args, arg, args_desc)
local attribs_setter
local function arg_attrib_or_comment(_, attrib_or_comment )
if type(attrib_or_comment) == "string" then
add_comment(arg, attrib_or_comment)
else
copy_attribs(arg, attrib_or_comment)
end
return attribs_setter
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end
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-- next field (__index) or attrib/comment (__call)
attribs_setter = setmetatable( {} , {
__index = function(_, name)
return args_desc(args, name)
end
, __call = arg_attrib_or_comment } )
return attribs_setter
end
local function func(sets)
return function (_, funcname)
local f = { name = funcname , args = {} }
if #comments > 0 then
f.comments = comments
comments = {}
end
sets[#sets+1] = f
local args
local function args_desc(_, args_name)
args[args_name] = duplicate_arg_name
return function (fulltype)
local arg = {
name = "_" .. args_name,
fulltype = fulltype,
}
f.args[#f.args+1] = arg
return attribs_setter(args, arg, args_desc)
end
end
args = setmetatable({}, { __index = args_desc })
local function rettype(value)
assert(type(value) == "string", "Need return type")
local ret = { fulltype = value }
f.ret = ret
return attribs_setter(args, ret, args_desc)
end
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local function funcdef(value)
if type(value) == "table" then
copy_attribs(f, value)
return rettype
end
return rettype(value)
end
return classdef(f, funcdef)
end
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end
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idl.funcptr = setmetatable({}, { __index = func(all_types) })
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idl.func = setmetatable({}, { __index = func(all_funcs) })
idl.funcs = all_funcs
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function idl.version(v)
rawset(idl, "_version", v)
end
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idl.vararg = "vararg"
idl.out = "out"
idl.inout = "inout"
idl.const = "const"
idl.ctor = "ctor"
idl.cfunc = "cfunc"
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idl.underscore = "underscore"
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idl.conly = "conly"
idl.cpponly = "cpponly"
idl.cppinline = "cppinline"
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idl.shortname = "shortname"
idl.NULL = "NULL"
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idl.UINT16_MAX = "UINT16_MAX"
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idl.INT32_MAX = "INT32_MAX"
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idl.UINT32_MAX = "UINT32_MAX"
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idl.UINT8_MAX = "UINT8_MAX"
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return setmetatable(idl , { __index = function (_, keyword)
error (tostring(keyword) .. " is invalid")
end})