gdjn  Check-in [1cc0d76954]

%toc
#top gdjn
allow use of Godot 4 with a [^civ civilized] scripting language, viz. [>janet Janet].

	janet: https://janet-lang.org
	godot: https://godotengine.org

@civ {
	to meet the bare minimum standards necessary to qualify as [!civilized] to my mind, a language must:
	* support compilation, whether to bytecode or machine code (excludes gdscript)
	* parse into an AST (excludes bash, php (or used to))
	* support AST-rewriting macros (excludes everything outside the lisp family except maybe rust)
	* use real syntax, not whitespace-based kludges (excludes python, gdscript inter alia)
	* provide a proper module system (excludes C)
	* provide for hygienic namespacing (excludes C, gdscript)
	* provide simple, cheap aggregate types (excludes gdscript, java, maybe python depending on how you view tuples)
	so, janet and fennel are about the only game in town.
}


## building

###dep dependencies
* [*build-time]
** GNU make
** git 
** [>top.janet janet] (automatically downloaded and built in [`ext/janet] by default)
*** CLI binary [`janet] (used to run codegen scripts)
*** linked with static library [`libjanet.a] using header [`janet.h]
** [>top.godot godot] ≥ 4.3, or the following files generated by godot:
*** [`gen/extension_api.json]
*** [`gen/gdextension_interface.h]
* [*runtime]
** godot ≥ 4.3

## license
the content of this repository is made available under the terms of the [>agpl GNU AGPLv3] except where otherwise noted. the full legally-binding english-language text of this license may be found in the root of this repository in the file [`license.en].
	agpl: https://www.gnu.org/licenses/agpl-3.0.txt

## about
gdscript is a [>anti-gdscriptische-aktion gibbering aberration] from beyond the stars; this is known. however, as a poor fool determined to write a video game, using godot no less, i resolved to ameliorate my suffering by binding a better language to the engine. such is the depth of my madness.

"it'll be simple," i told myself. "i've poked at gdextension before; i know it's a nightmare from the sewers of R'lyeh but i've already paid the toll in blood and pain to wrest loose its secrets. i have pretty good sense of what i'm doing this time. janet is well suited to this. [!wgah'nagl fhtagn]. ｉｔ　ｗｉｌｌ　ｂｅ　ｅａｓｙ"

yes, i was on drugs when i made this decision. i still am

a week or so later, i found myself implementing a new domain-specific IDL from scratch because that was less work than directly using the GDExtension api. the C side of GDExtension, it must be understood, was not designed for humans to use. it was intended as a scaffolding for godot-cpp, and only exists because C++ does not have a [^abi standardized ABI] -- C++ binaries can only talk to other C++ binaries by using C as a gobetween. no, this is not as crazy as it sounds. it's [!crazier.]

	abi: okay yes in reality it absolutely fucking does, everyone uses the same gods-damned amd one, in actual materially existing reality there is no interop problem at least on x86, but because we haven't ritually enshrined this model at ISO and pacified its marauding [!aramitama] with burnt offerings of motor oil and obsolete DRAM chips, we cover our eyes and pretend we cannot see what is sitting right in front of us. i love too compute dont u

so GDExtension is designed (if i may use the word liberally) with certain notions fixed firmly in mind. chief among them is that the actual C-level calls will be thoroughly ensconced in a suffocating buffer of template hackery, which will employ dark arts and crafts to generate gobs and gobs of impenetrable C at compile time. in fact, GDExtension is so designed that it is basically impossible to use it directly without a code generation layer. unwilling as i was to use C++ (it's against my religion), i wrote my layer from scratch, in janet.

this was not as bad as it could have been. janet has something [^deficient magnificent] in its stdlib that every language should have: a PEG module. the resulting program, ["tool/class-compile.janet] is under 1k lines! just barely. this tool is fired off by the makefile for the ["src/*.gcd] files, generating a header file ["gen/*.h] and an object file ["out/*.o] that implements the class described in the file. the care and feeding of this file format is described in the [>gcd GCD section].

	deficient: it is deficient in one particular way: it only operates over bytestrings. so you can use a PEG to parse raw text, or you can use it to implement a lexer, but you can't have both a PEG lexer and parser, which is really fucking dumb and makes things like dealing with whitespace far more painful than it needs to be.)

##gcd GCD language
GCD is a simple IDL which is translated into [^complex much more complicated C]. it's designed to make writing GDExtension classes as close to the native GDScript experience as possible, without the syntactic hanging offenses. you define the structure of the class using GCD, and write inline C to implement your functions. linemarkers are emitted properly so when you inevitably fuck it up, the compiler will be able to apportion the blame properly.

	complex: the generated implementation code is roughly 24x longer than the input file

the C "lexing" is pretty robust, and as long as you aren't doing horrible shit with the preprocessor (on the order of ["#define fi }]) it shouldn't choke on anything you write. if you [!are] doing horrible shit with the preprocessor however, [!you deserve everything you get].

["tool/class-compile.janet] accepts the following (nested) forms:

	block: \{ ··· [$[#1]] ··· }
	c-block:  {block inline C}
	scope: {block inner scope}

* [`(* ... *)] masks out a comment. these nest properly. normal C comments in a C block will be output with the rest of the text; gcd comments will be elided everywhere.
* [`(- ... -)] marks out inline documentation. this is not a comment! it is a syntactical element, allowed only in certain places (before a line item definition, after a return type, at the end of an argument specifier before the terminating comma/semicolon, or after an enum item). javadoc-style doc comments will be generated for the generated C, and it is my hope to also integrate this with godot's online API documentation system, which i will grudgingly acknowledge is pretty fricken neat.
* [`class [$name] (is|extends) [$base] {scope};] define a class [$name] inheriting from [$base]. use [`is] when inheriting from a godot native class; use [`extends] when inheriting from a gdextension class [!defined in your program] (inheriting from foreign gdextension classes will not work as expected either way). the necessity of this distinction is unfortunate; godot's virtual method implementation is hilariously broken so we have to manually hack around that particular cesspit of incompetence
* [`(fn | impl) [$name]([$arg-type] [$arg], ...) -> [$return-type] {c-block};] defines a function. use fn for normal static-dispatch functions; use impl for virtual overrides. these are implemented in bizarrely diverging ways but you don't have to care about that, because i did it for you. [!you owe me.]
** all arguments should be available by name as the proper godot type; e.g. [`string-name] becomes a [`gd_stringName].
** a pointer to the C-side storage struct for this class can be named by the token [`me]. if you need the godot object, write [`me -> self].
** for void functions, omit the [`-> [$return-type]] clause.
* [`var [$c-type] as [$gd-type]: [$v1], [$v2], ...;] defines a public class field (or global, at unit scope). [$c-type] is the actual storage type of the object; omit it to have a sensible choice picked for you based on [$gd-type]. [$gd-type] is the godot type that this field will be presented as.
* [`var [$c-type]: [$v1], [$v2], ...;] defines a private class field, accessible only to C.
** note that [*you cannot use intializers here] (yet, anyway); defining a reasonable syntax for a type that has to translate between C and the Godot type system is a decidedly nontrivial endeavor, and would probably have been more complicated than the rest of the syntax combined. for now, initialize your variables in [`new {c-block}]. 
* [`(import | use) <[$header]>;] transcludes a C system include into the unit. [`import] is the equivalent of using [`#include] in a header file; [`use] is the equivalent of using it in an implementation file.
* [`(import | use) \"[$header]\";] transcludes a local C file into the unit.
* [`(import | use) {c-block};] dumps a block of C code into the header or implementation. use this to e.g. define utility functions.
* [`new {c-block};] defines the class constructor
* [`del {c-block};] defines the class destructor. remember that in godot-land refcounting is used, so sane RAII is kind of out of the question unless you're imposing manual memory management on your poor end users
* [*godot types]: these are named using lisp-style tokens instead of the normal godot camelcase, both because i prefer it immensely and because it simplifies the more aggravating aspects of generating appropriate C from this trainwreck.
** primitive types: [`string], [`string-name], [`int], [`float], [`packed-float64-array] etc.
** container types: [`array], [`array\[[$prim-type]\]], [`dictionary], [`dictionary\[[$prim-key], [$prim-val]\]]
** reference types: these are prefixed with the [`ref] keyword, e.g [`ref node-3D], [`ref rich-text-label] etc. you can also write these as normal camelcase ([`ref RichTextLabel]) if you like, since i don't have to care about the internal structure of the identifier at this point.

note that [*semicolons are mandatory] after every statement. whitespace is irrelevant except as a token-separator.

the interface for each unit is written to ["gen/*.h]. be sure to call the unit load function at the proper place and time.

#anti-gdscriptische-aktion  manifesto against GDScript
> [!gdscript is a gibbering aberration from beyond the stars]

okay, this is, if anything, an understatement. it is possibly the single worst programming language i have yet (however begrudgingly) coded in. the tale of gdscript is one of fantastical hubris, of strife and horror and punishment handed down by the gods from on high like unto the sagas of old.

the creators of gdscript, you see (whom i shall henceforth address by the name of Abdul al-Hazred, for reasons i hope are readily apparent) originally wanted to use lua as godot's scripting language, and made an attempt to do so (this was sensible) but they concluded (incorrectly) that lua's facilities for threading were insufficient (i.e. they did not understand how to use the library correctly), so, having zero domain expertise or relevant experience, they resolved to devise their very own language from scratch. (this [>blunder was not]. i am put in mind of how Brendan Eich (piss be upon him) actually wanted to use a Scheme as Netscape's scripting language -- as i would have in his place! -- but the bleating idiot suits wanted something they could (however dishonestly) slap the Java branding on, so instead the entire modern web is infested by unending reams of [>wat ECMAScript]. more ECMAScript than there are stars. [!more ECMAScript than there is light])

so, knowing nothing of elementary PL theory, they hacked together a lurching screeching nightmare that is the antithesis to everything lua has ever been. shall i number the ways?

: lua has clean, consistent, unambiguous syntax that completely elides any need for syntactic handholding like brackets or (outside one niggling edge case) semicolons or line continuation sigils; gdscript reads the entrails of your indenting discipline and tries to infer structure therefrom (except for enums, for some unfathomable reason, which use C-style bracket blocks), which you inevitably have to hack your way around with the aforementioned semicolons and backslashes, and no matter what you do your code looks hideous. even this is inconsistent: the (woefully inadequate) match statement ([!"statement"], i will note, [!not] "expression"; the ML weenies in the audience just flinched, and rightly so) absolutely requires whitespace and newlines to delimit its cases.
: lua has a simple but extensible prototype-ish object model. godot has a full-blown class system with all the elegance of GObject, all the efficiency of Java, all the consistency of an American politician, and all the expressive power of MUMPS. single inheritance, no interfaces, no templates, no generics, no macros, no mixins. in a [!game engine]. [!lunacy, i tell you.]
: lua is cleverly designed to use tables to implement namespacing. in point of fact, namespacing is emergent; it's barely even part of the language. every lua chunk has its own clean namespace (or a shared global environment, an the host program will it so), and can choose what to bring in by binding modules to variables. gdscript barely supports namespacing at all, and in such a broken fucking way the native classes don't even try to use it. inner classes are defective, with reduced autocomplete metadata from other units, and cannot be used as resources. i honestly cannot fathom how they fucked this up so badly. every godot class you create pretty much pollutes a global namespace, and the situation is so bad that addon writers follow a convention of [!not naming their classes at all], using path-based imports instead.
: lua is a reasonable functional language. you can use any FP paradigm you want, with a bit of effort. closures are lightweight, simple, and fun to use. there is no difference between an ordinary function and a lambda. gdscript, on the other hand, is a procedural language with lambdas hacked awkwardly in, with syntax that will make you long for the purity of ruby. a closure is a completely different thing from functions, an object of class Callable, and can only be invoked by using [`Callable.call(args)]. and of course closures are completely untyped.
: lua has a straightforward dynamic type system. not great, but it's bearable. gdscript has a bizarre and spiritually unclean gradual typing system (i have always been suspicious of this concept and i am now firmly of the opinion that gradual typing is categorically a bug, not a feature.) it is not even internally consistent. "typed arrays" are not a type at all, but bizarre syntactic sugar for an array-specific runtime type tagging system. typed dictionaries [!were not even available] until 4.4, which at the time of writing is still in pre-release. there are no generics, no templates. just [`Variant], and special-casing as far as the eye can see. this is almost the worst part, because to use godot at all, even from another language, you have to interact with this abortion somehow. i am going to have to wrap some kind of elaborate blast shield around it to make it usable from janet and i do not eagerly anticipate the process.
: lua compiles down to bytecode. the reference implementation is not terribly impressive speed-wise, but luajit (an ideological variant based on pre-5.3 lua, not an implementation as it is often called) has performance characteristics bordering on C itself. gdscript does not compile at all; at best, it is pre-tokenized. yes, the entire damn thing is interpreted, at runtime. [*this alone should be enough to rule it out summarily as a game scripting language.] i mean, [!for shame]. fucking [!ruby] is probably more efficient at this point (not that i suggest anyone pull an RPGMaker XP here).

this is not exhaustive. this isn't even getting into the rat fuck screaming lunacy that is the underlying implementation. this is just the particular set of aggravations that came most immediately to mind when i set my cyberquill to electric paper. this is just a fucking taste, a faint flickering preview of how bad it gets. [!and people use this language for serious work.] they claim to [!like] it. the godot team blithely encourages people to learn gdscript, enthusing on its many virtues, as if they should not be too ashamed to show their faces where unsullied souls might see. the absolute mindless [!gall] is beyond all reckoning. i would say that this is the fucking PHP fractal-of-bad-design fiasco all over again, except, like, I've used PHP. [!i prefer PHP to this monstrosity.] yes, even ye-olde-worlde PHP, with [`register_globals] and all. i think it is fair to say that gdscript is to lua as modern American English is to [>toki Toki Pona] or Japanese.
in broad conclusion, gdscript is not a programming language. it is barely a scripting language. it is a genus of tyranid. it is the diseased, misshapen, gurgling spawn of the unclean things that gnaw the roots of Yggdrasil in the depths beyond depths where gods and titans fear to tread, and sing searing nightmares into the sleeping souls of mortals. it is a thing demonstrative of the Kali Yuga, and foretells in near time the merciful descent of Shiva's cleansing blade. it is the most intricate work of raw seething blasphemy yet wrought by mortal hands, if indeed mere mortals had anything to do with it.
you maybe have some idea of exactly [!how angry this thing makes me], simply from the fact that i was willing to endure the process of binding a whole new language to godot out of sheer fulminating [!spite].
- - - -
i would like to make one final point, and if you take anything away from the above rant, [!wote it be this]: programming language design is an art unto itself, and being a programmer -- even a very good one -- gives you fuck all credibility as a language designer. i don't care how many languages you know, i don't care how 10x your full stack is, i don't care if you have 700 years of experience at Current Thing, and i don't care how sharp your suit is. none of that has any bearing on your competence as a language designer. as an [!implementer], maybe. but leave the high concept stuff to your betters. do not under any circumstances design Yet Another Language, and work actively to shame those who do.

yes, i am being unironically elitist here: like making art and making war, language design is an [!intrinsically aristocratic pastime], and no amount of raw labor power or professional experience can suffice in the absence of a suitably disciplined, cultured, and talented mind. comrade stalin (peace be upon him) learned this the hard way about war, and if anything we moderns seem to be learning the same lesson even more slowly about the technical arts.

i myself am capable of reasonably competent language design, and that was a skill i developed over more than a decade of research and experiment and, mostly, plain old omphaloskepsis, things i would not have had time or energy for if i weren't broadly sheltered from the material conditions of the 21st century by my status as a(n intermittently starving) artist, paid by human patrons rather than bugman employers. i do not even hold a candle to [>fennel the] [>lua true] [>bakpakin masters] in this arena.

	toki: https://en.wikipedia.org/wiki/Toki_Pona
	blunder: https://www.youtube.com/watch?v=WjvsYi2DkOs
	fennel: https://github.com/bakpakin/Fennel
	lua: https://lua.org
	bakpakin: https://github.com/bakpakin
	wat: https://www.destroyallsoftware.com/talks/wat

[configuration]
entry_symbol = "gdjn_library_init"
compatibility_minimum = "4.3"

[libraries]
linux.x86_64 = "gdjn.so"

# [ʞ] lib/json.janet
#  ~ lexi hale <lexi@hale.su>
#  🄯 AGPLv3
#  ? a quick-and-dirty json parser good enough to
#    make sense of extension_api.json and no better
#  > (import :/lib/json)

(defn- mk-json-obj [& body]
	(tabseq [[key val] :in body]
			key val))

(defn- json-kw [kw & pat]
	~(* (constant ,kw) ,;pat))

(def parse-fail {
	:->string (fn [me]
				 (string/format "parse error %s at %d:%d"
					 (me :kind) (me :line) (me :col)))
})


(defn- fail [kind]
	(defn mk [line col]
		(struct/with-proto parse-fail
						   :kind kind
						   :line line
						   :col  col))
	~(error (cmt (* (line) (column)) ,mk)))

(def pattern (peg/compile ~{
	:bool (+ ,(json-kw true "true")
	         ,(json-kw false "false"))
	:null ,(json-kw :null "null")
	:val  (* :ws (+ :obj :str :num
					:ary :bool :null
					,(fail :bad-val)) :ws)
	:ary  (group
			 (+ "[]"
				(* "[" (+
					(* :val
						(any (* "," :val))
						(? (* "," :ws)))
					:wso
					,(fail :bad-array))
				 "]" )))
	:obj  (cmt (* "{" :ws
				 (? (*
					 :pair
					 (any (* :ws "," :ws :pair))
					 :ws (? ",") :ws))
		 :ws "}") ,mk-json-obj)
	:pair (group (* :str :ws ":" :ws :val))
	:str  (* `"` (<- (any (+ `\"`  (if-not `"` 1)))) `"`)

	# numerals #
	:dec-digit (range "09")
	:dec-int-lit (some :dec-digit)
	:dec-lit-base (+ (* :dec-int-lit "." (? :dec-int-lit))
				(* "." :dec-int-lit)
				:dec-int-lit)
	:dec-lit (+ (* :dec-lit-base "e" :dec-lit-base)
				:dec-lit-base)
	:hex-digit (+ :dec-digit
		          (range "af")
				  (range "AF"))
	:hex-lit (* "0x" (some :hex-digit))
	:num  (number (* (+ "-" "+" "")
		             (+ :hex-lit :dec-lit)))

	# misc #
	:ws-char (+ " " "\t" "\n")
	:wso  (some :ws-char)
	:ws   (any :ws-char)
	:main :val
}))

(defn parse [body]
	(try (let [parsed (peg/match pattern body)]
			 (when (= nil parsed)
				 (error :unknown))
			 (first parsed))
		([e] (error (match e
				 :unknown "mystery error"
				 _ (:->string e))))))


(defn main [& argv]
	(pp (parse ``
			   {"test": 123,
				"array": [{}, true, {"no":"yes", }]}
			   ``)))

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                     END OF TERMS AND CONDITIONS

            How to Apply These Terms to Your New Programs

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possible use to the public, the best way to achieve this is to make it
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For more information on this, and how to apply and follow the GNU AGPL, see
<https://www.gnu.org/licenses/>.

# [ʞ] gdjn
#  ~ lexi hale <lexi@hale.su>
#  ? write godot games in a civilized language
#  🄯 AGPLv3
#  > make all

o = out#  final binary output
g = gen#  where to store intermediate build artifacts
s = src#  source of the main gdjn library
t = tool# source of utilities built for use during build
x = ext#  where to fetch external binary libraries
l = lib#  libraries written in janet

# in case these are confusing:
# * ["src] only contains valuable files written by human hand
#
# * ["gen] does not contain any files that cannot be deleted
#   without any repercussions beyond having to run `make`
#   again.
#
# * ["tool] contains valuable hand-written source files which
#   are interpreted during the build process and help generate
#   artifacts that contribute to the final binary. [!however],
#   none of the tool code itself ends up in the binary in any
#   form.
#
# * ["ext] is a Keter-class high-security containment unit for
#   Other People's Code.
#
# * ["lib] contains (mostly janet) code that will be included
#   as blobs in the binary. janet code will be able to import
#   them. these will be compiled down to .jimage files and
#   then bundled into rsrc.o. libraries used in ["tool/*] 
#   should only be placed in this directory if they are also
#   used at runtime in the godot environment (e.g. the OOP
#   macros). library code used only by tools belongs in the
#   tool directory.
#
# * ["out] contains all live binaries and object files.

godot = godot4
godot.flags = --headless
godot.cmd = "$(godot)" $(godot.flags)
janet = $o/janet
git = git
git.flags.clone = --depth=1

janet.src.path = $x/janet
janet.src.git = https://github.com/janet-lang/janet.git
janet.root = $x/janet/src
janet.cfg = 

cc.link = -flto
cc.comp = -fPIC

ifeq ($(debug),1)
    cc.link += -g
    cc.comp += -g -O0
endif

cc.gdjn.comp = $(cc.comp) \
	-std=gnu23 \
	-I"$g" \
	-I"$s" \
	-I"$(janet.root)/include" \
	-I"$(janet.root)/conf"

cc.gdjn.link = $(cc.link) -shared
cc.janet.link = $(cc.link)

cc ?= $(CC)

path-ensure = mkdir -p "$(@D)"

# tell our scripts where to look for various files
export JANET_PATH = $(realpath $l)
export CC := $(cc)
export gd_build_out = $o
export gd_build_gen = $g
export gd_api_spec  = $g/extension_api.json
export gd_api_iface = $g/gdextension_interface.h

.PHONY: all clean purge
all: $o/gdjn.so 
clean:
	rm "$o/"*.o "$g/"*.{jimage,h} "$o/gdjn.so"
purge:
	rm "$o/"* "$g/"*

%/:; $(path-ensure)
%: | $(@D)/

tags: .
	find "$s" "$g" -name "*.h" -o -name "*.c" | xargs ctags

$o/gdjn.so: $o/gdjn.o $o/rsrc.o $o/interface.o \
            $o/janet-lang.o $o/janet-rsrc.o \
			$o/libjanet.a 
	"$(cc)" $(cc.gdjn.link) $^ -o"$@"

$o/interface.o: $t/c-bind-gen.janet \
                $g/interface.h \
				$(gd_api_spec) \
				$(gd_api_iface)
	"$(janet)" "$<" loader | "$(cc)" $(cc.gdjn.comp) -c -xc - -o "$@"

$g/interface.h: $t/c-bind-gen.janet \
				$(gd_api_spec)
	"$(janet)" "$<" header >"$@"

$g/%.h: $s/%.gcd $t/class-compile.janet $(realpath $(janet))
	"$(janet)" "$t/class-compile.janet" "$<" header >"$@"
$o/%.o: $s/%.gcd $g/%.h $t/class-compile.janet $(realpath $(janet))
	"$(janet)" "$t/class-compile.janet" "$<" loader \
		| "$(cc)" $(cc.gdjn.comp) -c -xc - -o "$@"

$o/%.o: $s/%.c $s/%.h $(realpath $(janet.root)/include/janet.h)
	"$(cc)" -c $(cc.gdjn.comp) "$<" -o"$@"

$o/rsrc.o: $t/rsrc.janet $(realpath $(janet)) \
           $g/api.jimage
	"$(janet)" "$<" -- "$g/api.jimage"

%.jimage: $(realpath $(janet))

$g/api.jimage: $t/api-compile.janet $(gd_api_spec)
	"$(janet)" "$<" "$(gd_api_spec)" "$@"

$g/%.jimage: $l/%.janet
	"$(janet)" -c "$<" "$@"

$x/janet $x/janet/src/include/janet.h:
	"$(git)" $(git.flags) clone $(git.flags.clone) "$(janet.src.git)" "$x/janet"

canon = $(realpath $(dir $1))/$(notdir $1)
define janet.build =
	"$(MAKE)" -C "$(janet.src.path)" "$(call canon,$@)" \
		JANET_$1="$(call canon,$@)"    \
		$(janet.cfg)
endef

$o/libjanet.a: $(janet.src.path)
	$(call janet.build,STATIC_LIBRARY)
$o/janet: $(janet.src.path)
	$(call janet.build,TARGET)

$g/extension_api.json $g/gdextension_interface.h:
	cd "$g" && $(godot.cmd) --dump-extension-api-with-docs \
	                        --dump-gdextension-interface


# individual dependencies

janet-header = $(janet.root)/include/janet.h

$o/gdjn.o: $s/util.h $g/interface.h $g/janet-lang.h $g/janet-rsrc.h $(gd_api_iface)
$o/janet-lang.o: $s/util.h $(janet-header)
$o/janet-rsrc.o: $s/util.h $g/janet-lang.h $(janet-header)

/* [ʞ] src/gdjn.c
 *  ~ lexi hale <lexi@hale.su>
 *  🄯 AGPLv3
 *  ? gdjn entry point
 */

#include "gdjn.h"
#include "janet-lang.h"
#include "janet-rsrc.h"

gdjn* gdjn_ctx = nullptr;

static void
gdjn_init
(	void*                          data,
	GDExtensionInitializationLevel lvl
) {
	if (lvl != GDEXTENSION_INITIALIZATION_SCENE) return;
	gdjn_types_fetch(&gdjn_ctx -> gd.t, gdjn_ctx -> gd.getProc);

	const gdjn_typeDB* c = &gdjn_ctx -> gd.t;

	gdjn_unit_janetLang_load();
	gdjn_unit_janetRsrc_load();

	gdjn_ctx -> gd.janetLang_inst = gdjn_class_JanetLang_new() -> self;

	auto e = gd_engine_registerScriptLanguage(
		c -> objects.engine,
		gdjn_ctx -> gd.janetLang_inst
	);
	if (e != gd_Error_ok) {
		_err("could not register JanetLang");
		return;
	}

	gdjn_ctx -> gd.janetSaver_inst = gdjn_class_JanetScriptSaver_new()->self;
	gdjn_ctx -> gd.janetLoader_inst = gdjn_class_JanetScriptLoader_new()->self;

	gd_refCounted_reference(gdjn_ctx -> gd.janetLoader_inst);
	gd_refCounted_reference(gdjn_ctx -> gd.janetSaver_inst);

	gd_resourceLoader_addResourceFormatLoader(
		gdjn_ctx -> gd.t.objects.resourceLoader,
		gdjn_ctx -> gd.janetLoader_inst,
		false
	);
	gd_resourceSaver_addResourceFormatSaver(
		gdjn_ctx -> gd.t.objects.resourceSaver,
		gdjn_ctx -> gd.janetSaver_inst,
		false
	);
		/*
	gd_variant ret;
	c -> gd_object.methodBindPtrcall(
		c -> gd_m_engine.registerScriptLanguage_ptr,
		c -> objects.engine,
		(GDExtensionConstTypePtr[]) {
			&gdjn_ctx -> gd.janetLang_inst,
		}, &ret
	);
	*/

	_t(array).empty(&gdjn_ctx -> gd.dox, nullptr);
	gd_stringName empty = {};
	_t(stringName).empty(&empty, nullptr);
	_t(array).setTyped(&gdjn_ctx -> gd.dox,
			GDEXTENSION_VARIANT_TYPE_DICTIONARY, &empty, &empty);

	_t(stringName).dtor(&empty);
}

static void
gdjn_teardown
(	void*                          data,
	GDExtensionInitializationLevel lvl
) {
	if (lvl != GDEXTENSION_INITIALIZATION_SCENE) return;
	/* we get double frees otherwise */

	const gdjn_typeDB* c = &gdjn_ctx -> gd.t;

	gd_engine_unregisterScriptLanguage(
		c -> objects.engine,
		gdjn_ctx -> gd.janetLang_inst
	);
	/*
	GDExtensionTypePtr ret;
	c -> gd_object.methodBindPtrcall(
		c -> gd_m_engine.unregisterScriptLanguage_ptr,
		(GDExtensionConstTypePtr[]) {
		}, &ret
	);*/

	gd_resourceLoader_removeResourceFormatLoader(
		gdjn_ctx -> gd.t.objects.resourceLoader,
		gdjn_ctx -> gd.janetLoader_inst
	);
	gd_resourceSaver_removeResourceFormatSaver(
		gdjn_ctx -> gd.t.objects.resourceSaver,
		gdjn_ctx -> gd.janetSaver_inst
	);
	/* gd_refCounted_unreference(gdjn_ctx -> gd.janetLoader_inst); */
	/* gd_refCounted_unreference(gdjn_ctx -> gd.janetSaver_inst); */
	gdjn_class_JanetLang_del(nullptr, gdjn_ctx -> gd.janetLang_inst);

	gdjn_ctx -> gd.free(gdjn_ctx);
	gdjn_ctx = nullptr;
}


gdBool
gdjn_library_init
(	GDExtensionInterfaceGetProcAddress getProc,
	GDExtensionClassLibraryPtr         classLib,
	GDExtensionInitialization*         init
) {

	auto alloc = (GDExtensionInterfaceMemAlloc)getProc("mem_alloc");

	gdjn_ctx = alloc(sizeof(gdjn));
	gdjn_ctx -> gd = (gdjn_gd) {
		.lib = classLib,
		.getProc = getProc,
		.alloc = alloc,
		.realloc = (GDExtensionInterfaceMemRealloc)
			getProc("mem_realloc"),
		.free = (GDExtensionInterfaceMemFree)
			getProc("mem_free"),

		.err = (GDExtensionInterfacePrintError)
			getProc("print_error"),
		.errMsg = (GDExtensionInterfacePrintErrorWithMessage)
			getProc("print_error_with_message"),
		.warn = (GDExtensionInterfacePrintWarning)
			getProc("print_warning"),
		.warnMsg = (GDExtensionInterfacePrintWarningWithMessage)
			getProc("print_warning_with_message"),

		.wrap = (GDExtensionInterfaceGetVariantFromTypeConstructor)
			getProc("get_variant_from_type_constructor"),
		.cast = (GDExtensionInterfaceGetVariantToTypeConstructor)
			getProc("get_variant_to_type_constructor"),
	};

	*init = (GDExtensionInitialization) {
		.initialize = gdjn_init,
		.deinitialize = gdjn_teardown,
		.userdata = gdjn_ctx,
		.minimum_initialization_level = GDEXTENSION_INITIALIZATION_SCENE,
	};

	return true;
}

void
gdjn_dox
(	gd_dictionary* page
) {

}

/* [ʞ] src/gdjn.h
 *  ~ lexi hale <lexi@hale.su>
 *  🄯 AGPLv3
 *  ? core types and declarations used by gdjn
 */

#pragma once
#include <assert.h>
#include <stdint.h>
#include "janet.h"
#include "interface.h"

typedef void (*GDExtensionInterfacePrintError)(const char *p_description, const char *p_function, const char *p_file, int32_t p_line, GDExtensionBool p_editor_notify);

#define _emit(fn, msg) \
	(gdjn_ctx -> gd.fn((msg), __func__, __FILE__, __LINE__, true))
#define _warn(msg) _emit(warn, msg)
#define _err(msg)  _emit(err, msg)

typedef GDExtensionBool gdBool;

#define _alloc(ty, n) \
	((typeof(ty)*)gdjn_alloc(sizeof(ty) * (n)))
#define _free(v) \
	(gdjn_ctx -> gd.free(v))
#define _sz(r) ((sizeof(r) / sizeof(*r)))

#define _t(T) \
	(gdjn_ctx -> gd.t.gd_##T)
#define _method(name) \
	static void name  \
	(	GDExtensionClassInstancePtr self,    \
		const GDExtensionConstTypePtr* argv, \
		GDExtensionTypePtr ret               \
	)


typedef struct gdjn {
	struct gdjn_gd {
		GDExtensionClassLibraryPtr lib;

		GDExtensionInterfaceGetProcAddress getProc;

		GDExtensionInterfaceMemAlloc   alloc;
		GDExtensionInterfaceMemRealloc realloc;
		GDExtensionInterfaceMemFree    free;

		GDExtensionInterfacePrintError err;
		GDExtensionInterfacePrintErrorWithMessage errMsg;
		GDExtensionInterfacePrintWarning warn;
		GDExtensionInterfacePrintWarningWithMessage warnMsg;

		GDExtensionInterfaceGetVariantFromTypeConstructor
			wrap;
		GDExtensionInterfaceGetVariantToTypeConstructor
			cast;

		gdjn_typeDB t;
		gd_array dox;

		GDExtensionObjectPtr
			janetLang_inst,
			janetLoader_inst,
			janetSaver_inst;
	} gd;
	struct gdjn_jn {
		Janet env;
	} jn;
} gdjn;

extern gdjn* gdjn_ctx;

[[gnu::alloc_size(1)]] static inline
void* gdjn_alloc(size_t sz) {
	return gdjn_ctx -> gd.alloc(sz);
}


typedef struct gdjn_gd gdjn_gd; // derp
typedef struct gdjn_jn gdjn_jn;

typedef struct gdjn_class_def gdjn_class_def;

void
gdjn_dox
(	gd_dictionary* page
);

(* [ʞ] src/janet-lang.gcd vi:ft=d
 *  ~ lexi hale <lexi@hale.su>
 *  🄯 AGPLv3
 *  ? implement the godot-janet interface
 *)

use <janet.h>;

class JanetLang is ScriptLanguageExtension {
	use <stdio.h>;
	use "util.h";

	new {};

	impl _get_name() -> string {
		gd_string j;
		_t(string).newWithUtf8Chars(&j, "Janet");
		return j;
	};

	impl _get_extension() -> string {
		gd_string j;
		_t(string).newWithUtf8Chars(&j, "janet");
		return j;
	};

	impl _supports_documentation() -> bool { return true; };
	impl _supports_builtin_mode()  -> bool { return true; };
	impl _is_using_templates()     -> bool { return false; };
	impl _can_inherit_from_file()  -> bool { return true; };

	impl _handles_global_class_type(string t) -> bool { return false; };
	impl _get_type() -> string {
		gd_string s = {};
		_t(string).newWithUtf8Chars(&s, "JanetScriptText");
		return s;
	};
	impl _get_recognized_extensions() -> packed-string-array {
		gd_packedStringArray r = {};
		_t(packedStringArray).empty(&r, nullptr);
		_gdu_array_string_pushLit(&r, "janet");
		_gdu_array_string_pushLit(&r, "jimage");
		return r;
	};
	impl _get_comment_delimiters() -> packed-string-array {
		gd_packedStringArray r = {};
		_t(packedStringArray).empty(&r, nullptr);
		_gdu_array_string_pushLit(&r, "#");
		return r;
	};
	impl _get_string_delimiters() -> packed-string-array {
		gd_packedStringArray r = {};
		_t(packedStringArray).empty(&r, nullptr);
		_gdu_array_string_pushLit(&r, "\" \"");
		_gdu_array_string_pushLit(&r, "```` ````");
		_gdu_array_string_pushLit(&r, "``` ```");
		_gdu_array_string_pushLit(&r, "`` ``");
		_gdu_array_string_pushLit(&r, "` `");
		(* et cetera ad infinitum *)
		return r;
	};
	impl _is_control_flow_keyword(string k) -> bool {
		#define l(s) ((pstr){(s),sizeof(s)})
		const pstr words[] = {
			l("if"), l("cond"), l("when"), l("unless"),
			l("loop"), l("each"),
			l("for"), l("forv"), l("forever"),
			l("seq"), l("catseq"),
			(* et cetera ad nauseam *)
		};
		#undef l
		for (size_t i = 0; i < _sz(words); ++i) {
			if (gdu_strEq_sz(&k, words[i].v, words[i].sz))
				return true;
		}
		return false;
	};
	impl _get_reserved_words() -> packed-string-array {
		typedef struct {const char* w; size_t sz;} pstr;
		#define l(s) ((pstr){(s),sizeof(s)})
		const pstr words[] = {
			l("if"), l("cond"),
			l("def"), l("defn"), l("defmacro"),
			l("fn"),
			l("var"), l("let"),
			l("loop"), l("each"),
			l("for"), l("forv"), l("forever"),
			l("seq"), l("catseq"),
			l("map"), l("mapcat"),
			l("find"),
			l("array"), l("tuple"),
			l("string"), l("buffer"),
			l("table"), l("struct"),
			(* et cetera ad nauseam *)
		};
		gd_packedStringArray r = {};
		_t(packedStringArray).empty(&r, nullptr);
		for (size_t i = 0; i < _sz(words); ++i) {
			gdu_array_string_pushPtr(&r, words[i].w, words[i].sz);
		}
		return r;
		#undef l
	};

	impl _validate_path(string path) -> string {
		gd_string s = {};
		_t(string).empty(&s, nullptr);
		return s;
	};


	impl _make_template
	(	string tpl;
		string class;
		string base;
	) -> ref Script {
		auto janscr = gdjn_class_JanetScriptText_new();
		return janscr -> self;
	};
	impl _create_script() -> ref Object {
		auto janscr = gdjn_class_JanetScriptText_new();
		return janscr -> self;
	};

	impl _get_documentation() -> array[dictionary] {
		gd_array a = {};
		_t(array).ref(&a, &gdjn_ctx -> gd.dox);
		return gdjn_ctx -> gd.dox;
	};

	impl _init() { /* (* "deprecated" but i still have to impl it?? *) */ }; 
	impl _frame() {};
	impl _thread_enter() { janet_init(); };
	impl _thread_exit() { janet_deinit(); };
	impl _finish() {};

	impl _overrides_external_editor() -> bool { return false; };
	impl _get_global_class_name(string path) -> dictionary {
		gd_dictionary dict;
		_t(dictionary).empty(&dict,nullptr);
		return dict;
		(* FIXME *)
	};
	impl _validate(
		string script;
		string path;
		bool vFuncs;
		bool vErrs;
		bool vWarns;
		bool vSafe;
	) -> dictionary {
		gd_dictionary dict;
		_t(dictionary).empty(&dict,nullptr);
		return dict;
	};
};

class JanetScript is ScriptExtension {
	var as string: path;
	new {
		_t(string).empty(&me -> path, nullptr);
	};
	del {
		_t(string).dtor(&me -> path);
	};

	impl _create_instance(array[variant] argv, int argc, ref Object owner, bool refCounted, int error) -> ref Object {

	};
	impl _get_language() -> ref ScriptLanguage {
		return gdjn_ctx -> gd.janetLang_inst;
	};
	impl _set_path(string path, bool takeOver) {
		if (takeOver) {
			_t(string).dtor(&me -> path);
			me -> path = path;
		} else {
			_t(string).dtor(&me -> path);
			_t(string).copy(&me -> path, (void const*[]) {&path});
		}
	};
	impl _get_base_script() -> ref Script {
		return nullptr;
	};
	impl _has_static_method(string-name method) -> bool {
		return false;
	};
	impl _is_tool() -> bool { return false; }; (* FIXME *)
};

class JanetScriptText extends JanetScript {
	var as string: src;
	new {
		_t(string).empty(&me -> src, nullptr);
	};
	del {
		_t(string).dtor(&me -> src);
	};

	impl _get_instance_base_type() -> string-name {
		return _gdu_intern("ScriptExtension");
	};
	impl _has_source_code() -> bool   { return true; };
	impl _get_source_code() -> string {
		auto d = gdu_string_dup(&me -> src);
		return d;
	};
	impl _set_source_code(string s) {
		_t(string).dtor(&me -> src);
		_t(string).copy(&me -> src, (void const*[]) {&s});
	};
};

class JanetScriptImage extends JanetScript {
	impl _has_source_code() -> bool { return false; };
	var struct gdjn_class_JanetScript_image {
		size_t   sz;
		uint8_t* buf;
	}: image;
	impl _get_instance_base_type() -> string-name {
		return _gdu_intern("ScriptExtension");
	};
};

(* [ʞ] src/janet-rsrc.gcd vi:ft=d
 *  ~ lexi hale <lexi@hale.su>
 *  🄯 AGPLv3
 *  ? implement the saving and loading of janet scripts
 *)
use "util.h";
use <assert.h>;
use "janet-lang.h";

use {
	static gd_packedStringArray
	janetExts(void) {
		gd_packedStringArray r = {};
		_t(packedStringArray).empty(&r, nullptr);
		_gdu_array_string_pushLit(&r, "janet");
		_gdu_array_string_pushLit(&r, "jimage");
		return r;
	};
	typedef enum janetFileKind {
		janetFileNone,
		janetFileImage,
		janetFileText,
	} janetFileKind;
	static inline janetFileKind
	janetKind(gd_string const* const path) {
		if (gdu_string_suffix(path, _litSz(".jimage"))) {
			return janetFileImage;
		} else if (gdu_string_suffix(path, _litSz(".janet"))) {
			return janetFileText;
		} else return janetFileNone;
	}
};

class JanetScriptLoader is ResourceFormatLoader {
	impl _get_recognized_extensions() -> packed-string-array {
		return janetExts();
	};
	impl _handles_type(string-name type) -> bool {
		return gdu_symEq(&type, "JanetScriptText")
		    || gdu_symEq(&type, "JanetScriptImage");
	};
	impl _get_resource_type(string path) -> string {
		const char* str = "";
		switch (janetKind(&path)) {
			case janetFileImage: str="JanetScriptImage"; break;
			case janetFileText: str="JanetScriptText"; break;
		}
		return gdu_str(str);
	};
	use {
		static inline gd_variant
		vFromErr(int64_t err) {
			gd_variant v;
			auto wrap = gdjn_ctx -> gd.wrap(GDEXTENSION_VARIANT_TYPE_INT);
			wrap(&v, &err);
			return v;
		}
		static inline gd_variant
		vFromObj(GDExtensionObjectPtr o) {
			gd_variant v;
			auto wrap = gdjn_ctx -> gd.wrap(GDEXTENSION_VARIANT_TYPE_OBJECT);
			wrap(&v, &o);
			return v;
		}
	};
	impl _load
	(	string path;
		string origPath;
		bool   subThreads;
		int    cacheMode;
	) -> variant {
		switch (janetKind(&path)) {
			case janetFileImage: {
				auto s = gdjn_class_JanetScriptImage_new();
				return vFromObj(gdu_cast(s->self, "Resource"));
			}; 
			case janetFileText: {
				auto s = gdjn_class_JanetScriptText_new();
				return vFromObj(gdu_cast(s->self, "Resource"));
			};
			default: {
				return vFromErr(gd_Error_errFileUnrecognized);
			};
		}
	};
};


class JanetScriptSaver is ResourceFormatSaver {
	use {
		static inline bool
		gdjn_isJanet(GDExtensionObjectPtr* res) {
			return _gdu_objIs(res, JanetScriptImage)
			    || _gdu_objIs(res, JanetScriptText);
		}
	};
	impl _get_recognized_extensions() -> packed-string-array {
		return janetExts();
	};
	impl _recognize(ref Resource res) -> bool {
		return gdjn_isJanet(res);
	};
	impl _save(ref Resource res, string path, int flags) -> int {
		gd_refCounted_reference(res);
		assert(gdjn_isJanet(res));
		gd_string path_mine;
		_t(string).copy(&path_mine, (void const*[]) {&path});
		auto fd = gd_fileAccess_open(path, 
				gd_FileAccess_ModeFlags_write);
		gd_refCounted_reference(fd);

		if (_gdu_objIs(res, JanetScriptText)) {
			auto asText = gdu_cast(res, "JanetScriptText");
			gd_string src = gd_script_getSourceCode(asText);
			gd_fileAccess_storeString(fd, src);
			_t(string).dtor(&src);
		} else if (_gdu_objIs(res, JanetScriptImage)) {
			auto asImg = gdu_cast(res, "JanetScriptImage");
		};

		gd_fileAccess_close(fd);
		_t(string).dtor(&path_mine);
		gd_refCounted_unreference(fd);
		gd_refCounted_unreference(res);
	};
};

/* [ʞ] util.h
 *  ~ lexi hale <lexi@hale.su>
 *  🄯 AGPLv3
 *  ? encapsulate annoying operations (read: pitiful, fragile blast
 *    shield over the most indefensibly psychotic pieces of the godot
 *    "type" "system")
 *
 *    if you want to use this outside gdjn, redefine the macro _t
 *    from gdjn.h appropriately.
 *
 *    (honestly tho you should use c-bind-gen.janet too)
 */

#pragma once
#include "gdjn.h"
#include <string.h>

static inline gd_string
gdu_string_of_stringName(const gd_stringName* const s) {
	gd_string r;
	_t(string).fromStringName(&r, (void*)&s);
	return r;
}

static inline gd_stringName
gdu_stringName_of_string(const gd_stringName* const s) {
	gd_stringName r;
	_t(stringName).fromString(&r, (void*)&s);
	return r;
}

static inline gd_stringName
gdu_intern_sz (const char* str, const size_t sz) {
	gd_stringName r = {};
	if (sz == 0) _t(stringName).newWithUtf8Chars(&r, str);
	        else _t(stringName).newWithUtf8CharsAndLen(&r, str, sz);
	return r;
}

static inline gd_stringName
gdu_intern (const char* str) {
	return gdu_intern_sz(str, 0);
}

static inline gd_string
gdu_str_sz (const char* str, const size_t sz) {
	gd_string r = {};
	if (sz == 0) _t(string).newWithUtf8Chars(&r, str);
	        else _t(string).newWithUtf8CharsAndLen(&r, str, sz);
	return r;
}

static inline gd_string
gdu_str (const char* str) {
	return gdu_str_sz(str, 0);
}

#define _gdu_intern(x) (gdu_intern_sz((x), sizeof(x)-1))
#define  _litSz(x) (x), (sizeof (x)-1)
#define    _ref(x) typeof(typeof(x) const* const)
#define _refMut(x) typeof(typeof(x)      * const)
#define _with(T, k, v, ...) ({\
	typeof(gd_##T) k = v; \
	do { __VA_ARGS__; } while (0); \
	_t(T).dtor(&k); \
})

#define _withSym(k, v, ...) \
	_with(stringName, k, gdu_intern(v), __VA_ARGS__)
#define _withSym0(k, ...) \
	_with(stringName, k, {}, __VA_ARGS__)
#define _withStr(k, v, ...) \
	_with(string, k, gdu_str(v), __VA_ARGS__)
#define _withStr0(k, v, ...) \
	_with(string, k, {}, __VA_ARGS__)

#define _typeEq(a, b) \
	__builtin_classify_type(typeof(a)) == _builtin_classify_type(typeof(b))

#define _refVal   0
#define _refPtr   1
#define _refArray 2

#define _indirect(a) \
		__builtin_types_compatible_p(typeof(a), void*)

#define _refKind(a) \
	__builtin_choose( _typeEq(typeof_unqual(a), \
	                          typeof_unqual(a[0]) []), _refArray \
		/* false */ __builtin_choose(_typeEq(a, (typeof_unqual(a[0]) *)), _refPtr ))

#define _szElse(a, zero) \
	__builtin_choose(_refKind(a) == _refArray, \
		/* true */ _sz(a), \
		/* false */ __builtin_choose(_refKind(a) == _refPtr, \
			/* true */ (__builtin_counted_by(ptr) != nullptr ? \
			            *__builtin_counted_by(ptr) : (zero)) \
			/* false */ (void)0 /* bad type */ ))
#define _sz0(a)   _szElse(a,0)
#define _szStr(a) \
	__builtin_choose(_typeEq((a), pstr), (a).sz, _szElse(a, strlen(a)))

#define _array(t) struct {t* v; size_t sz;}
typedef _array(char) pstr;

#define _strWithSz(a) (a), _strLen(a)

static inline bool
gdu_symIs
(	gd_stringName const* const a,
	gd_stringName const* const b
) {
	bool res;
	_t(stringName).equal(a, b, &res);
	return res;
}

static inline bool
gdu_symEq_sz
(	_ref(gd_stringName) a,
	_ref(char)          b,
	size_t const        sz
) {
	auto bSym = gdu_intern_sz(b,sz);
	bool res  = gdu_symIs(a, &bSym);
	_t(stringName).dtor(&bSym);
	return res;
}

static inline bool
gdu_symEq
(	_ref(gd_stringName) a,
	_ref(char)          b
) { return gdu_symEq_sz(a, b, 0); }

#define _gdu_symEq(a,b) (gdu_symEq_sz(a, _litSz(b)))

static inline bool
gdu_objIs
(	GDExtensionObjectPtr obj,
	_ref(char)           id,
	size_t const         sz
) {
	bool res = false;
	_withSym0(name, ({
		if (!_t(object).getClassName(obj, gdjn_ctx -> gd.lib, &name))
			break;
		res = gdu_symEq_sz(&name, id, sz);
	}));
	return res;
}

static inline bool
gdu_strIs
(	gd_string const* const a,
	gd_string const* const b
) {
	bool res;
	_t(string).equal(a, b, &res);
	return res;
}

static inline bool
gdu_strEq_sz
(	_ref(gd_string) a,
	_ref(char)      b,
	size_t const    sz
) {
	auto bSym = gdu_str_sz(b,sz);
	bool res  = gdu_strIs(a, &bSym);
	_t(string).dtor(&bSym);
	return res;
}

static inline bool
gdu_strEq
(	_ref(gd_string) a,
	_ref(char)      b
) { return gdu_strEq_sz(a, b, 0); }

#define _gdu_symEq(a,b) (gdu_symEq_sz(a, _litSz(b)))
#define _gdu_strEq(a,b) (gdu_strEq_sz(a, _litSz(b)))
#define _gdu_objIs(obj, id) \
	(gdu_objIs(obj, _litSz(#id)))

#define _gdu_string_emit(s, tgt) \
	(gdu_string_emit(&(s), (tgt), sizeof (tgt)-1))

static inline size_t
gdu_string_emit
(	size_t sz;

	const gd_string* const s,
	char                   target[static sz],
	size_t                 sz
) {
	/* docs lie btw, this returns a count of bytes,
	 * not "characters" (??)
	 * (thank the gods for small mercies) */
	size_t len = _t(string).toUtf8Chars(s, target, sz);
	target[len] = 0;
	return len;
}

#define _gdu_stringName_emit(s, tgt) \
	(gdu_stringName_emit(&(s), (tgt), sizeof (tgt) - 1))

static inline pstr
gdu_string_pdup (_ref(gd_string) s) {
	size_t len = gd_string_length(s) + 1;
	char* buf = _alloc(char, len);
	gdu_string_emit(s, buf, len - 1);
	return (pstr){buf,len};
}

static inline gd_string
gdu_string_dup (_ref(gd_string) s) {
	gd_string cp;
	_t(string).copy(&cp, (void const*[]) {s});
	return cp;
}

#define _cat(x,y) x##y
#define __cat(x,y) _cat(x,y)
#define _gensym __cat(_sym_,__COUNTER__)

#define __gdu_string_auto(szid, name, str) \
	size_t szid = gd_string_length(str) + 1; \
	char[szid] name; \
	gdu_string_emit(str, name, szid-1); 

#define _gdu_string_auto(...) __gdu_string_auto(_gensym, __VA_ARGS__)

#if __has_builtin(__builtin_alloca_with_align)
#	define _stalloc(ty, n) \
		(__builtin_alloca_with_align(sizeof(ty)*(n), alignof(ty)*8))
#else
#	define _stalloc(ty, n) \
		(__builtin_alloca(sizeof(ty)*(n)))
#endif

#define _gdu_gstr_stack(ty, str) ({ \
	size_t sz = gd_##ty##_length(str) + 1; \
	char* buf = _stalloc(char, sz);        \
	gdu_##ty##_emit(str, buf, sz - 1);     \
	buf; \
})
#define _gdu_gstr_stackp(ty, str) ({ \
	size_t sz = gd_##ty##_length(str) + 1; \
	char* buf = _stalloc(char, sz);        \
	gdu_##ty##_emit(str, buf, sz - 1);     \
	(pstr) {.v = buf, .sz = sz}; \
})

#define _gdu_string_stack(str)      _gdu_gstr_stack(string, str)
#define _gdu_stringName_stack(str)  _gdu_gstr_stack(stringName, str)
#define _gdu_string_stackp(str)     _gdu_gstr_stackp(string, str)
#define _gdu_stringName_stackp(str) _gdu_gstr_stackp(stringName, str)


static inline size_t
gdu_stringName_emit
(	size_t sz;

	_ref(gd_stringName) s,
	char                target[static sz],
	size_t              sz
) {
	gd_string r;
	_t(string).fromStringName(&r, (void*)&s);
	const auto len = gdu_string_emit(&r, target, sz);
	_t(string).dtor(&r);
	return len;
}

#define _gdu_packedArray_push_def(name, T, input, fn) \
	static inline bool \
	gdu_array_##name   \
	(	gd_packed##T##Array*         self,\
		const typeof(input)* const   arg  \
	) {\
		bool ret;\
		auto c = &gdjn_ctx -> gd.t; \
		(c -> gd_packed##T##Array.fn) ( \
			self,\
			(GDExtensionConstTypePtr[]) { \
				arg,\
			}, &ret, 1\
		);\
		return ret;\
	}

#define _gdu_packedArrayTypes \
	_(Byte,    byte,    uint8_t   ) \
	_(Int32,   int32,   int32_t   ) \
	_(Int64,   int64,   int64_t   ) \
	_(Float32, float32, int32_t   ) \
	_(Float64, float64, int64_t   ) \
	_(String,  string,  gd_string ) \
	_(Vector2, vector2, gd_vector2) \
	_(Vector3, vector3, gd_vector3) \
	_(Vector4, vector4, gd_vector4) \

#define _gdu_packedArray_defs(maj, min, input) \
	_gdu_packedArray_push_def(min##_##push,   maj, input, append) \
	_gdu_packedArray_push_def(min##_##concat, maj, gd_packed##maj##Array, append_array)
/* bool gdu_array_(type)_push(self, type)
 * bool gdu_array_(type)_concat(self, packedArray[type])
 */

#define _(...) _gdu_packedArray_defs(__VA_ARGS__)
	_gdu_packedArrayTypes
#undef _

/* obnoxious special case */
static inline bool
gdu_array_string_pushPtr
(	gd_packedStringArray* self,
	const char* const     str,
	size_t                sz
) {
	gd_string tmp;
	if (sz == 0) _t(string).newWithUtf8Chars      (&tmp, str);
	else         _t(string).newWithUtf8CharsAndLen(&tmp, str, sz);
	bool ret = gdu_array_string_push(self, &tmp);
	_t(string).dtor(&tmp);
	return ret;
}
#define _gdu_array_string_pushLit(self, str) \
	(gdu_array_string_pushPtr((self), (str), sizeof (str) - 1))

static inline bool
gdu_string_suffix
(	_ref(gd_string) self,
	_ref(char)      affix,
	size_t          affsz
) {
	auto ch = _gdu_string_stackp(self);
	if (affsz == 0) affsz = strlen(affix);
	if (ch.sz < affsz) return false;
	for (size_t i = 0; i < affsz; ++i) {
		auto a =  ch.v[ch.sz - 2 - i];
		auto b = affix[affsz - 1 - i];
		if (a != b) return false;
	}
	return true;
}

static inline void*
gdu_classTag(_ref(char) name) {
	void* tag = nullptr;
	_withSym(sName, name,
		tag = _t(classdb).getClassTag(&sName);
	);
	return tag;
}
static inline GDExtensionObjectPtr
gdu_cast
(	GDExtensionConstObjectPtr what,
	_ref(char)                to
) {
	return _t(object).castTo(what, gdu_classTag(to));
}

(defn api-parse [src]
	{} #TODO parse json
	)

(defn api-gen [api]
	@{} #TODO gen bindings
	)

(defn main [_ api-src api-dest & _]
	(def api
		(with [fd (file/open api-src :r)]
			(api-gen (api-parse (:read fd :all)))))
	(def api-bin (make-image api))
	(with [fd (file/open api-dest :w)]
		(:write fd api-bin))
	0)

# [ʞ] c-bind-gen.janet
#  ~ lexi hale <lexi@hale.su>, may the gods have mercy on
#    the tattered remnants of my soul
#  🄯 CC0 (please, megacorps, im begging you, steal this
#    piece of shit. YOUVE EARNED IT)
#  > janet tool/c-bind-gen.janet (header|loader)
#
#  ! look, im not gonna bullshit you. this code is terrible
#    i started writing it when i was still getting the hang
#    of janet, in particular working with its lispified OOP
#    system, and i made some terrible mistakes. in
#    particular because i've never actually used a proper
#    prototype-based object system before (lua doesn't
#    really count here). at some point i realized the code
#    was unfixably bad and i just stopped caring. at some
#    point, if this project goes anywhere, this whole
#    gibbering aberration deserves to be ripped out and
#    redone from scratch, ideally using some of the cleaner
#    mechanisms i ended up putting together for
#    tool/class-compile.janet

(import :/lib/json)

(def <gd-sym> (let
	[transform (fn[{:seg segments} tx delim]
	   (string/join (map tx segments) delim))
	 capitalize (fn[x] (string
		(string/ascii-upper (slice x 0 1))
		(slice x 1)))]

	{:@inherit (fn gd-sym:inherit[class & defs]
		(struct/with-proto class ;defs))
	 :@new (fn gd-sym:new[class & args]
		(struct/with-proto class ;((class :%init) ;args)))
	 :%init (fn gd-sym:init[dfn]
		[:id (dfn :id)
		 :seg (get dfn :seg [;(string/split "-" (string (dfn :id)))])])


	 :from      |(:@new $0 {:id $1})
	 :from-snek |(as-> $1 x
					   (string/ascii-lower x)
					   (string/split "_" x)
					   {:id (string/join x "-")
						:seg x}
					   (:@new $0 x))

	 :vstr   |(if (> ($ :ver) 1) (string ($ :ver)) "")
	 :tall   |(transform $ capitalize "") 
	 :sulk   |(transform $ identity "_")
	 :scream |(transform $ string/ascii-upper "_")
	 :name   |(apply string [ (first ($ :seg))
				;(map capitalize (slice ($ :seg) 1))])}))

(def <gd-method>
	(:@inherit <gd-sym>
			   :%init (fn [spec]
						  [ ;((<gd-sym> :%init) spec)
						    :ver (spec :ver) ])))

(def <gd-type>
	(:@inherit <gd-sym>
	   :%init (fn[spec]

				  (defn bind-def[bind-spec]
					  (:@new <gd-method>
							 (match bind-spec
								 (obj (struct? obj)) obj
								 [sym ver] {:id sym :ver ver}
								 sym       {:id sym :ver 1  })))

				  [ ;((<gd-sym> :%init) spec)
				   :binds (map bind-def
							   (or (spec :binds) []))
				   :methods (map bind-def
							   (or (spec :methods) []))
				   :ops (map bind-def
							   (or (spec :ops) []))
				   :ctors (or (spec :ctors) {})
				   :mode (spec :mode)])
	   :binds []
	   :methods []
	   :ctors {}
	   :ops []
	   :mode  :
	   :enum (fn [me]
				 (string "GDEXTENSION_VARIANT_TYPE_" (:scream me)))
	   ))

(defn env: [v dflt]
	(or ((os/environ) v) dflt))

(def api-spec
	(let [api-spec-path
		  (env: "gd_api_spec"
				(string (env: "gd_build_gen" "gen")
						"/extension_api.json" ))]
		(json/parse
			(with [fd (file/open api-spec-path :r)]
				(:read fd :all)))))

(def vector-types-float (map |(symbol 'vector $) (range 2 5)))
(def vector-types
	(tuple/join vector-types-float
				(map |(symbol $ 'i) vector-types-float)))

(def packed-types
	(map |(symbol 'packed- $ '-array)
		 (tuple/join vector-types-float
					 ['color 'byte 'string
					  'int32   'int64
					  'float32 'float64])))

(defn names-variant? [x]
	(-> (map |(:tall (:from <gd-sym> $)) packed-types)
		(array/join ["String" "StringName"
					 "Array" "Dictionary"])
		(has-value? x)))
(defn names-prim? [x]
	(-> ["int" "float" "bool"]
		(has-value? x)))
(def variants (map |(:@new <gd-type> $) ~[
	{:id variant :binds [get-ptr-constructor
						 get-ptr-destructor
						 get-ptr-operator-evaluator
						 get-ptr-internal-getter
						 get-ptr-builtin-method
						 get-type
						 booleanize]}
	{:id bool        }
	{:id color }

	,;(map |{:id $} vector-types)
	,;(map |{:id $
			 :methods '[get set size resize fill clear
					    append append_array insert remove-at
					    has is-empty find rfind count
					    reverse slice duplicate]
			 :ctors {:empty []}
			 }
		   packed-types)
	{:id array
	 :binds [ref set-typed]
	 :ctors {:empty []}}
	{:id dictionary
	 :binds [set-typed operator-index operator-index-const]
	 :ctors {:empty []}}

	{:id string-name :mode :dc
	 :ops   [equal]
	 :binds [new-with-utf8-chars
			 new-with-utf8-chars-and-len]
	 :methods [length
			   ends-with begins-with
			   trim-suffix trim-prefix]
	 :ctors {:empty []
			 :copy [[:from string-name]]
			 :from-string [[:from string]]}}

	{:id string :mode :dc
	 :ops   [equal]
	 :binds [[new-with-utf8-chars         1]
			 [new-with-utf8-chars-and-len 2]
			  to-utf8-chars]
	 :methods [length
			   ends-with begins-with
			   trim-suffix trim-prefix]
	 :ctors {:empty []
			 :copy [[:from string]]
			 :from-string-name [[:from string-name]]}}
]))

(def classes (map |(:@new <gd-type> $) '[
	{:id classdb :binds [[register-extension-class 4]
						  unregister-extension-class
						  register-extension-class-method
						  register-extension-class-virtual-method
						  get-method-bind
						  get-class-tag
						 [construct-object 2]]}
	{:id object :binds [set-instance
						set-instance-binding
						get-class-name
						cast-to
						has-script-method
						call-script-method
						method-bind-ptrcall
						destroy
						]}
	{:id global :binds [get-singleton]} #hax
]))

(def internals (map |(:@new <gd-type> $) ~[
	{:id engine :binds [register-script-language
						unregister-script-language]}
	{:id ref-counted :binds [reference unreference
							 get-reference-count]}
	{:id script :binds [get-source-code set-source-code]}
	{:id file-access :binds [open close store-string get-as-text]}
	{:id resource-loader :binds [add-resource-format-loader
								 remove-resource-format-loader]}
	{:id resource-saver :binds [add-resource-format-saver
								remove-resource-format-saver]}
]))

(def global-enums (map |(:from <gd-sym> $) '[
	error
]))

(def singletons (map |(:from <gd-sym> $) '[
	engine
	resource-loader
	resource-saver
]))

(def c-fetch-decl (string
   "void gdjn_types_fetch\n"
   "(	struct gdjn_typeDB* t,\n"
   "	GDExtensionInterfaceGetProcAddress getProc\n"
   ")"))

(defn main [_ mode & args]
	(def api {
	  :decls   @[]
	  :aliases @[]
	  :calls   @[]
	  :defer-calls @[] # dependency Hel bypass
	  :types   @[]
	  :method-defs @[]
	})
	(def config (env: "gd_config" "double_64"))
	(def sizes (do
	   (var sz-list nil)
	   (loop [cfg :in (api-spec "builtin_class_sizes")
			      :until (not= nil sz-list)]
		   (when (= config (cfg "build_configuration"))
			   (set sz-list (cfg "sizes"))))
	   
	   (def vt @{})
	   (loop [sz :in sz-list]
		   (put vt (sz "name") (sz "size")))
	   vt))
	(defn prim:gd->c [x]
		(defn bp [x small big]
			(case (sizes x)
				4 small
				8 big
				(error (string "bad type size " (sizes x) " for " x))))
		(case x
			"int" (bp "int" "int32_t" "int64_t")
			"float" (bp "float" "float" "double")
			"bool" "bool"))
	(defn variant:gd->c [x]
		(def v (find |(= x (:tall (:@new <gd-sym> {:id ($ :id)}))) variants))
		(string "gd_" (:name v)))
	(defn translate-type [st &opt flags]
		(defn fl [x] (string/check-set (or flags :) x))
		(match (string/split "::" st)
			# enums can be directly mapped to a C
			# instantiation of the enum
			["enum" ty]
				(match (string/split "." ty)
					[a b] (string/format "gd_%s_%s" a b)
					[x] (string "gd_" x))

			# primitives will be returned directly
			([ty] (names-prim? ty))
				(prim:gd->c ty)

			# opaques ("variant" members) will be
			# returned as the appropriate opaque object
			([ty] (names-variant? ty))
				(let [t (variant:gd->c ty)]
					(if (not (fl :r)) t
						(string/format "typeof(%s)%s*" t
							(if (fl :c) " const" ""))))

			# everything else has to be an object; return
			# a pointer
			[ty] (string "GDExtension"
						 (if (fl :c) "Const" "")
						 "ObjectPtr /*"ty"*/")

			fbk (error (string/format "bad type %q" fbk))))
	(defn method:return-type [method]
		(let [rv (method :return_value)] (cond
			(nil?   rv) "void"
			(empty? rv) "void"
			(translate-type (rv "type")))))
	(defn method:args [method t-self &opt self-flags]
		(as-> (if (has-key? method :arguments)
				  (method :arguments)
				  []) lst
			  (if (method :is_static) lst
				  (tuple/join [{"name" "self"
								"type" t-self
								:flags (keyword :r (or self-flags :))}] lst))
			  (map |(string (translate-type ($ "type") ($ :flags))
							" const "
							($ "name")) lst)))
	(def gdclasses (merge
		;(seq [src :in ["classes" "builtin_classes"]]
			(tabseq [class :in (api-spec src)]
					(class "name")
					{:methods (if (= nil (class "methods")) {}
								  (tabseq [meth :in (class "methods")]
										  (meth "name")
										  (tabseq [[k v] :pairs meth]
												  (keyword k) v)))
					 :enums (get class "enums" [])}))))
	(defn add [to fmt & vals]
		(array/push to (string/format fmt ;vals)))
	(defn add-get-proc [class method]
		(def version-str (:vstr method))
		# this is so hateful and evil im not even going to pretty it up
		(def ptr-t (if (= (method :id) 'get-ptr-internal-getter)
					   "GDExtensionInterfaceGetVariantGetInternalPtrFunc"
					   (string/format "GDExtensionInterface%s%s"
							 (string (:tall  class)     (:tall  method)) version-str
					   )))
						 
		(add (api :calls) "t -> gd_%s.%s = (%s)getProc(\"%s%s\");"
			 (:name  class) (:name method) ptr-t
			 (string (:sulk class) "_" (:sulk method)) version-str))

	(def gd-iface-pfx "GDExtensionInterface")

	(defn add-methods [class binds]
		(loop [bind :in binds
			   :let [c-type (string gd-iface-pfx
					(:tall class) (:tall bind))]]
			(def ptr-t (if (= (bind :id) 'get-ptr-internal-getter)
						   "GDExtensionInterfaceGetVariantGetInternalPtrFunc"
						   c-type))
			(add (api :decls) "\t%s%s %s;" ptr-t (:vstr bind) (:name bind))
			(add-get-proc class bind)))
	(defn add-enums [class]
		(def api-ent (get-in gdclasses [(:tall class) :enums] []))
		(defn ln [& x] (add (api :types) ;x))
		(each e api-ent
			(def id (string "gd_" (:tall class) "_" (e "name")))
			# the underlying type is IMPORTANT! godot enums
			# appear to use the godot int type, which (at present)
			# is always 8 bytes long. this means trying to write
			# a godot "enum" to a plain old C enum will, if you
			# are very lucky, cause your program to barf all over
			# the stack and immediately segfault
			(ln  "typedef enum %s : int64_t {" id)
			# thank the gods for C23. this would have been really
			# unpleasant otherwise
			(each n (e "values")
				(def ident (:from-snek <gd-sym> (n "name")))
				(def sym (:@new <gd-sym> ident))
				(ln "\t%s_%s = %d," id (:name sym) (n "value"))
				(ln "\t/* %s */"
					 (n "description")))
			(ln "} %s;\n" id)))
	(defn add-ctors [class ctors]
		(loop [[id form] :pairs ctors]
			(def id-sym (:from <gd-sym> id))
			(def key (freeze (seq [[name t] :in form
						   :let [tsym (:from <gd-sym> t)]]
							 {"name" (string name)
							  "type" (string (:tall tsym))})))
			(def ent (as-> (api-spec "builtin_classes") x
				 (find |(= (freeze ($ "name")) (:tall class)) x)
				 (x "constructors")
				 (find |(if (empty? key) (not (has-key? $ "arguments"))
							(let [args (freeze ($ "arguments"))]
								(= key args))) x)))
			(assert ent (string/format "no matching constructor: %q" form))
			(let [ctor-idx (ent "index")]
				(add (api :decls) "\tGDExtensionPtrConstructor %s;" (:name id-sym))
				(add (api :calls) "t -> gd_%s.%s = t -> gd_variant.getPtrConstructor(%s, %d);"
					 (:name class) (:name id-sym) (:enum class) ctor-idx)
			)))

	(add (api :aliases) "#define _opaque(n) struct{unsigned char _opaque_ [n];}")

	(defn with-names [ln names func]
		(ln "{")
			(each [id val] names
				(ln "gd_stringName %s;" id)
				(ln "t -> gd_stringName.newWithUtf8Chars(&%s, %q);" id val))
			(func)
			(each [id _] names
				(ln "t -> gd_stringName.dtor(&%s);" id))
		(ln "}"))

	(loop [e :in global-enums]
		(defn ln [& x] (add (api :types) ;x))
		(def spec (find |(= ($ "name") (:tall e))
						(api-spec "global_enums")))
		(assert spec (string/format "no enum with name %s found"
									(:tall e)))
		(ln "typedef enum gd_%s : int64_t {" (:tall e))
		(each v (spec "values")
			(def name (:from-snek <gd-sym> (v "name")))
			(ln "\tgd_%s_%s = %d," (:tall e) (:name name) (v "value"))
			(when (v "description")
				(ln "\t/* %s */" (v "description"))))
		(ln "} gd_%s;\n" (:tall e))
		)

	(loop [v :in variants
		   :let [vsz (or (sizes (:tall v))
						 (sizes (string (v :id) )))]]
		(add (api :aliases) # these are all opaque objects
			 "typedef _opaque(%d) gd_%s;"
			 vsz (:name v))
		(add (api :decls  ) "struct {")
		(def my-enum (:enum v))
		(add-methods v (v :binds))
		(add-enums v)

		# bind builtins
		# WHY IS THIS *YET ANOTHER* COMPLETELY DIFFERENT API
		# for the SAME LITERAL THING fuck youuuuu
		(when (has-key? gdclasses (:tall v)) (loop [m :in (v :methods)
			   :let [method (get-in gdclasses [(:tall v) :methods
											   (:sulk m)])]]
			(add (api :decls) "\tGDExtensionPtrBuiltInMethod %s;" (:name m))

			(def return-type
				(if (not (has-key? method :return_type)) "void"
					(translate-type (method :return_type))))
			(def args (method:args method (:tall v)
								   (if (method :is_const) :c :)))

			(def impl @[])
			(unless (= return-type "void")
				(array/push impl
					(string/format "typeof(%s) ret;" return-type)))
			(array/push impl
				(string/format "_g_typeDB -> gd_%s.%s("
							   (:name v) (:name m)))
					
			
			(array/push impl
						(string "\t" (if (method :is_static)
										 "nullptr" "(void*)self") ",")
						"\t(void const*[]) {")
			(when (has-key? method :arguments)
				(each a (method :arguments)
					(array/push impl
								(string/format "\t\t&%s," (a "name")))
					))
			(array/push impl (string/format "\t}, %s, %d"
				(if (= return-type "void") "nullptr" "&ret")
				(if (not (has-key? method :arguments)) 0
					(length (method :arguments))))
						");")
			(unless (= return-type "void")
				(array/push impl "return ret;"))


			(array/push (api :method-defs)
				{:dfn (string/format "%s gd_%s_%s\n(\t%s\n)"
									 return-type (:name v) (:name m)
									 (string/join args ",\n\t"))
				 :impl impl})

			(with-names (fn [& a] (add (api :defer-calls) ;a))
						[[:methodID (:sulk m)]]
						(fn [] (add (api :defer-calls)
									"t -> gd_%s.%s = t -> gd_variant.getPtrBuiltinMethod(%s, &methodID, %d);"
									(:name v) (:name m)
									my-enum (method :hash)
						)
			))))

		(when (v :ctors)
			(add-ctors v (v :ctors)))

		(when (not= "variant" (:name v))
			(add (api :decls) "\ttypeof(gd_%s* (*)(GDExtensionVariantType*)) raw;" (:name v))
			(add (api :calls) "t -> gd_%s.raw = (typeof(t->gd_%s.raw))t -> gd_variant.getPtrInternalGetter(%s);" 
				 (:name v) (:name v) my-enum))

		(loop [o :in (v :ops)]

			(add (api :decls) "\tGDExtensionPtrOperatorEvaluator %s;" (:name o))
			(add (api :calls) "t -> gd_%s.%s = t -> gd_variant.getPtrOperatorEvaluator(GDEXTENSION_VARIANT_OP_%s, %s, %s);"
				 (:name v) (:name o) (string/ascii-upper (:sulk o))
				 my-enum my-enum)
			)

		(when (string/check-set (v :mode) :d)
			(add (api :calls)
				 "t -> gd_%s.dtor = t -> gd_variant.getPtrDestructor(%s);"
				 (:name v) my-enum )
			(add (api :decls) "\tGDExtensionPtrDestructor dtor;"))

		(add (api :decls) "} gd_%s;" (:name v)))

	(loop [c :in classes
		     :let [pfx  (string "GDExtensionInterface" (:tall c) (:vstr c)) 
				   gd-t (:sulk c)]]

		(add (api :decls) "struct {")
		(add-methods c (c :binds))
		(add-enums c)
		(add (api :decls) "} gd_%s;" (:name c)))


	(loop [i :in internals
		     :let [class (gdclasses (:tall i))]]
		(def ctr-id (string/format "gd_m_%s" (:name i)))

		(add (api :decls) "struct {")
		(add-enums i)
		(loop [m :in (i :binds)
			   :let [method ((class :methods) (:sulk m))]]
			(assert method
					(string/format "method %s not found in class %s"
								   (m :id) (i :id)))
			(add (api :decls) "\tGDExtensionMethodBindPtr %s_ptr;"
				 (:name m))

			(def return-type (method:return-type method))
			(def args (method:args method (:tall i)
								   (if (method :is_const) :c :)))

			(def impl @[])
			(defn ln [& x] (array/push impl ;x))
			(when (not= return-type "void")
				(ln (string/format "%s ret;" return-type)))
			(ln "_g_typeDB -> gd_object.methodBindPtrcall("
				 (string/format "\t_g_typeDB -> gd_m_%s.%s_ptr,"
								(:name i) (:name m))
				 (if (method :is_static) "\tnullptr," "\t(void*)self,")
				 "\t(GDExtensionConstTypePtr[]) {")
			(as-> (method :arguments) args
				  (if (nil? args) [] args)
				  (map |(string "\t\t&" ($ "name") ",") args)
				  (ln ;args))
			(ln (string "\t}, "
						(if (not= return-type "void")
							"&ret"
							"nullptr")) ");")
			(when (not= return-type "void") (ln "return ret;"))
			(array/push (api :method-defs)
						{:dfn (string/format "%s gd_%s_%s\n(\t%s\n)"
											 return-type
											 (:name i)
											 (:name m)
											 (string/join args ",\n\t")
											 )
						 :impl impl})

			(defn ln [& l] (add (api :calls) ;l))

			(with-names ln
				[["className"  (:tall  i)]
				 ["methodName" (:sulk m)]]
				(fn [] 
					(ln (string
							"auto ptr = t -> gd_classdb.getMethodBind(&className, &methodName, %d);\n"
							"\tt -> %s.%s_ptr = ptr;\n"
							"\t"`printf("* bind method %s.%s (%%p)\n",ptr);` "\n"
							"\tassert(ptr != nullptr);")
					(method :hash)
					ctr-id    (:name m)
					(:name i) (:name m)
					))))
		(add-ctors i (i :ctors))
		(add (api :decls) "} %s;" ctr-id))


	(add (api :decls) "struct {")
	(loop [s :in singletons]
		(add (api :decls) "\tGDExtensionObjectPtr %s;" (:name s))
		(defn cln [& v] (add (api :calls) ;v))
		(with-names cln
			[["sgtName" (:tall s)]]
			(fn []
				(cln "t -> objects.%s = t -> gd_global.getSingleton(&sgtName);" (:name s))
				(cln "if (t -> objects.%s == nullptr) abort();" (:name s))
				)))
	(add (api :decls) "} objects;")

	(case mode
		"list" (do
			# may the gods have mercy on me
			(defn print-binds [v]
				(print "    • \e[94;4m" (v :id)"\e[m")
				(each b (v :binds)
					(print "        · " (b :id) "\n"
						   "            \e[3;35mgd_" (:name v) "." (:name b) "()\e[m")))
			(print "we are currently binding the following symbols")
			(print "- \e[1mvariants\e[m -" )
			(each v variants (print-binds v))
			(print "- \e[1mclasses\e[m -" )
			(each c classes (print-binds c))
			(print "- \e[1mptrcalls\e[m -" )
			(each i internals
				(print "    • \e[94;4m" (i :id)"\e[m")
				(each b (i :binds)
					(print "        · " (b :id) "\n"
						   "            \e[3;33mgd_m_" (:name i) "." (:name b) "_ptr\e[m\n"
						   "            \e[3;92mgd_" (:name i) "_" (:name b) "()\e[m")))
				
			(print "- \e[1msingletons\e[m -" )
			(each s singletons
				(print "    • \e[94;4m" (s :id)"\e[m\n"
					   "        \e[3;33mobjects." (:name s) "\e[m" ))

			(print "- \e[1mglobal enums\e[m -" )
			(each e global-enums
				(print "    • \e[94;4m" (e :id)"\e[m\n"
					   "        \e[3;33mgd_" (:tall e) "\e[m" )))
		"header" (do
			(print "/* automatically generated by tool/c-bind-gen.janet */\n\n"
				   "#pragma once\n"
				   "#include \"gdextension_interface.h\"\n")
			(loop [list :in [(api :aliases)]
				   val :in list] (print val))
			(print "\ntypedef struct gdjn_typeDB {")
			(loop [d :in (api :decls)]
				(print "\t" d))
			(print "} gdjn_typeDB;")
			(each t (api :types) (print t))
			(print c-fetch-decl ";")
			(each m (api :method-defs)
				(print (m :dfn) ";")))

		"loader" (do
					 (print "#include <stdlib.h>\n"
							"#include <stdio.h>\n"
							"#include <assert.h>\n"
							"#include \"interface.h\"\n\n"
							"static gdjn_typeDB* _g_typeDB;\n\n"
							# HORRID HACK
							
							c-fetch-decl "{\n"
							;(map |(string "\t" $ "\n")
								  [ "_g_typeDB = t;"
								    ;(api :calls)
								    ;(api :defer-calls) ])
							"}")
					 (each m (api :method-defs)
						 (print (m :dfn) "{\n\t" (string/join (m :impl) "\n\t") "\n}\n")))))

# [ʞ] tool/class-compile.janet
#  ~ lexi hale <lexi@hale.su>
#  🄯 AGPLv3
#  ? compiles a godot class definition to C source
#  > janet tool/class-compile.janet <class> (loader|header)

(def *src-file* (gensym))

(def parse-doc
	(do
		(def doc-parser (peg/compile '{
			:hs          (+ " " "\t")
			:-           "-"
			:open-line   (* (? " ") (? '(some (if-not "\n" 1))) "\n")
			:single-line (* (? " ") (? '(some (* (not :hs) 1))) (any :hs) -1)
			:mid-line    (+ (* (any :hs) :- (? " ")
			                   (? '(some (if-not "\n" 1))) "\n")
			                (* (? '(some (if-not "\n" 1))) "\n"))
			:close-line  (+ (* (any :hs) -1)
							(* (any :hs) :- (? " ")
							   (? '(some (if-not (* (any :hs) -1) 1)))
			                   (any :hs) -1))
			:main        (+ (* :open-line (any :mid-line) :close-line)
			                :single-line
							'(any 1)) # admit defeat
	   }))

		(fn parse-doc[str]
			(peg/match doc-parser str))))

(def syntaxes
	(do (def quot-syntax
			'(nth 1 (unref (* (<- (+ `"` `'`) :quo)
					   (<- (any (+ (* `\` (backmatch :quo))
								   (if-not (backmatch :quo) 1))))
					   (backmatch :quo)) :quo)))
		(defn fail [cause]
			(defn mk [ln col]
				{:kind :parse
				 :cause cause
				 :ln ln :col col})
			~(error (cmt (* (line) (column)) ,mk)))
		(defn req [id body]
			~(+ (* ,;body) ,(fail (keyword :malformed- id))))
		(defn kw [id body]
			~(* ,id (> 1 :bound) ,(req id ~(:s+ ,;body))))
		(defn comment-syntax [id open close]
			~(* ,open '(any (+ ,id
							   :quot
							   (if -1 ,(fail :fell-off-comment))
							   (if-not ,close 1))) ,close))

		{:class-def (peg/compile ~{
			:b (any :s)
			:bound (+ :s ";" "," `"` "{" "}" "<" ">" ":" "->" "(" ")")
			:sym (some (if-not :bound 1))
			:sym-kw (cmt ':sym ,keyword)
			:term (* :b ";" :b)
			:quot ,quot-syntax
			:quot-ang (* "<" (<- (any (+ `\>`
										 (if-not ">" 1))))
						 ">")
			:doc (cmt (* :b ,(comment-syntax :doc "(-" "-)") :b)
						 ,(fn [text] [:doc ;(parse-doc text)]))
			:def-class (* (+ (* (constant :class) "class")
			                 (* (constant :iface) "interface"))
						 :s+ (<- :sym) :s+
						 (+ (* (constant :native) "is")
			                (* (constant :gdext) "extends")
							,(fail :bad-inherit))
						 :s+ (<- :sym)
						 :b "{" :b (group (any :stmt)) :b "}")
			:def-import (* (constant :import)
						   (+ (* (constant :impl) "use")
						      (* (constant :head) "import"))
						   :b
						   (+ (* (constant :lit) :c-block)
						      (* (constant :sys) :quot-ang)
						      (* (constant :loc) :quot)))
			:c-comment (+ (* (+ "//" "#") (any (if-not (+ "\n" -1) 1)) (+ "\n" -1))
			              (* "/*" (any (if-not "*/" 1)) "*/"))
			:c-block (cmt (* "{" (line) (<- (any (+ (drop :quot)
										(drop :c-block)
										:c-comment
										(if -1 ,(fail :fell-off-c-block))
										(if-not "}" 1)))) "}")
						 ,(fn [ln text]
								   (string/format "#line %d %q\n%s"
								                  (+ 4 ln) (dyn *src-file*) text)))
			:type-gd-vector (* "vector" (+ "2" "3" "4"))
			:type-gd-basic (cmt '(+ 
			                 "int"
			                 "float"
							 "bool"
			                 "string-name"
			                 "string"
			                 "color"
							 :type-gd-vector

							 "transform-2D"
							 "transform-3D"
							 "basis"
							 "projection"

							  "variant"
							  "array"
							  "dictionary"
							  (* "packed-"
			                     (+ (* (+ "int" "float") (+ "32" "64"))
			                        :type-gd-vector
			                        "byte" "color" "string") "-array"))
							 ,keyword)
			:type-gd (+ (group (* (constant :ref) "ref" :b ':sym))
				        (group (* (constant :array) "array" :b
			              "[" :b :type-gd-basic :b "]"))
				        (group (* (constant :dictionary) "dictionary" :b
			              "[" :b :type-gd-basic ","
			                  :b :type-gd-basic :b "]"))
				        :type-gd-basic)

			:arg-spec (* (group (* :type-gd :s+ ':sym (? :doc))) (? (* :b (+ "," ";") :b :arg-spec)))
			:arg-list (group (* "(" :b (? :arg-spec) :b (?";") :b ")"))
			:def-method (* (constant :func) (+ (* (constant :method) "fn")
											   (* (constant :impl  ) "impl"))
			               :s+ ':sym :b :arg-list :b
				           (+ (* "->" :b (group (* :type-gd (? :doc))))
							  (constant [:void]))
						 :b :c-block)
			:def-event (* (constant :event)
						 (+ (* (constant :ctor) "new")
			                (* (constant :dtor) "del") ) :b :c-block)
			:def-var (* (constant :var)
			            # c type
						(+ (* "var" (> (* :s+ "as")) (constant :auto))
						   (* "var" :s+
			                 '(any (if-not (+ (* :s+ "as" :s+)
			                                  (* :b ":" )) 1))))
			            (+ (* :s+ "as" :s+ :type-gd)
			                (constant :priv))
			            (* :b ":" :b) (any (* ':sym :b "," :b)) ':sym)

			:def (* (? :doc)
					(+ :def-class
					   :def-var
					   :def-import
					   :def-method
					   :def-event))
			:stmt (* :b (+ (group :def) "") :term)
			# :main (+ (* (any :stmt) -1)
			# 		,(fail :bad-stmt))
			:main (* (any :stmt) (+ -1 ,(fail :bad-stmt)))})
		 :comment-eraser (peg/compile ~{
			:quot ,quot-syntax
			:comment ,(comment-syntax :comment "(*" "*)")
			:main (% (any (+ (drop :comment)
			                 (<- 1))))})
	 }))

(defn parse-class [str]
	(def stripped (first (peg/match (syntaxes :comment-eraser) str)))
	(peg/match (syntaxes :class-def) stripped))

(def *colorize* (gensym))
(setdyn *colorize* true)

(defn style [& body]
	(def emit (if (dyn *colorize*)
				  (fn [sq] (string "\e[;" sq "m"))
				  (fn [_ ] "")))
	(defn enter [body style-seq]
		(defn push [st]
			(if (= "" style-seq) st
				(string style-seq ";" st)))
		(defn enc [st str]
			(def cst (push st))
			(string (emit cst)
					(enter str cst)
					(emit style-seq)))
		(match body
			(str (string? str)) str
			[:hl str] (enc "1" str)
			[:em str] (enc "3" str)
			[:rv str] (enc "7" str)
			[:red str] (enc "31" str)
			[:span & strs] (string ;(map |(enter $ style-seq) strs))
			_ (error (string/format "bad style spec %q" body))))
	(enter body ""))

(defn err->msg [e]
	(defn err-span [h & m] [:span [:hl [:red h]] ": " ;m ])
	(match e
		{:kind :parse} (err-span "parse error"
			 (string (e :cause) " at ")
			 [:hl (string/format "%d:%d" (e :ln) (e :col))])
		_ (error e)))
		# _ (err-span "error"
		# 			"something went wrong (" [:em (string e)] ")")))


(defn indent [n lst]
	(map |(string (string/repeat "\t" n) $) lst))

(defn fmt-docs [dox]
	(tuple/join ["/**"] (map |(string " * " $) dox) [" */"]))

(def <obj> {
	:new   (fn [this & args] (struct/with-proto this ;args))
	:is?   (fn [this obj] (and (struct? obj)
							   (= this (struct/getproto obj))))
	:impl? (fn [this obj]
			(and (struct? obj)
			     (match (struct/getproto obj)
			     	 nil     false
			     	(@ this) true
			     	 p      (:impl? this p))))
})

(def <sym>
	(let [tcap (fn tcap[str]
		   (def init (string/slice str 0 1))
		   (def rest (string/slice str 1))
		   (string (string/ascii-upper init)
				   rest))]
		(:new <obj>
			  :segs []
			  :read (fn read[this id]
						(if (:impl? this id)
							(:new this :segs (id :segs))
							(:new this :segs (string/split "-" id))))
			  :form (fn form[me tx &opt sep]
						(keyword (string/join (map tx (me :segs))
											  (or sep ""))))
			  :tall   |(:form $ tcap)
			  :scream |(:form $ string/ascii-upper "_")
			  :sulk   |(:form $ identity "_")
			  :stab   |(:form $ identity "-")
			  :say (fn [me]
					   (def s (me :segs))
					   (string (first s)
							  ;(map tcap (slice s 1)))))))
(def <func-c> (:new <obj>
	:id    :
	:args  []
	:ret   :
	:body  []
	:quals []
	:dec*  (fn [this quals ret id sig & body]
			 (:new this
				   :id id
				   :ret ret
				   :body body
				   :quals quals
				   :args (map (fn [[t id]]
								  {:id id :t t})
							  sig)))
	:dec- (fn [this & dfn] (:dec* this [:static]  ;dfn))
	:dec  (fn [this & dfn] (:dec* this []         ;dfn))
	:proto (fn [me arg-ids?]
			   (def arg->str (if arg-ids?
				   |(string "typeof(" ($ :t) ") " ($ :id))
				   |(string "typeof(" ($ :t) ")")))
			   (defn arg-lines [args]
				   (if (empty? args) []
					   (let [a @[]]
						   (loop [arg :in args]
							   (when (not (empty? a))
								   (put a (- (length a) 1)
										(string (last a) ",")))
							   (array/push a (string "\t" (arg->str arg))))
						   (tuple (string "(" (first a))
								  ;(slice a 1)
								  ")"))))
			   [ (string (if (empty? (me :quals)) ""
							 (string (string/join (me :quals) " ") " "))
						 (me :ret))
				 (string (me :id) (if (empty? (me :args)) "(void)" ""))
				 ;(arg-lines (me :args)) ])
	:declare* (fn [me] [ ;(:proto me false) ";" ])
	:define*  (fn [me] [ ;(:proto me true) "{" 
						;(indent 1 (me :body)) "}" ])
	:declare (fn [me]
	 (defn flag? [f] (has-value? (me :quals) f))
	 (cond
		(flag? :inline) (:define* me)
		(flag? :static) []
		(:declare* me)))
	:define (fn [me] (if (has-value? (me :quals) :inline) []
						 (:define* me)))))

(def <type-c> (:new <obj>
	:id (:new <sym>)
	:dec* (fn [this mode id & meta] (:new this
										  :id (:read <sym> id)
										  :mode mode
										  ;meta))
	:dec  (fn [this & dfn] (:dec* this :pub  ;dfn))
	:dec- (fn [this & dfn] (:dec* this :priv ;dfn))
	:dec@ (fn [this & dfn] (:dec* this :opaq ;dfn))
	:content (fn [me] "void")
	:declare (fn [me]
				[(string "typedef " (:say (me :id)) ";")])
	:define (fn [me]
				[(string "typedef " (:content me) " " (:say (me :id)) ";")])))

(def <struct-c> (:new <type-c>
	:dec* (fn [this mode id fields & meta]
			 ((<type-c> :dec*) this mode id
			  :fields fields
			  ;meta))
	:declare (fn [me]
				 (let [id (:say (me :id))]
					 [(string "typedef struct " id " " id ";")]))
	:define (fn [me]
				[(string "struct " (:say (me :id)) " {")
				 ;(indent 1
					(catseq [f :in (me :fields)]
						(def fdesc (string/format "typeof(%s) %s;"
									   (f :t) (:say (:read <sym> (f :id)))))
						(if (f :doc) (tuple/join (fmt-docs (f :doc))
												 [fdesc])
							[fdesc])
						))
				 "};"])))

(def <cursor> (:new <obj>
	:path []
	:unit nil
	:push (fn [me what & vals]
			  (array/push ((me :unit) what) ;vals))
	:branch (fn [me id & dfn] (:new me
				:super me
				:path (tuple/join (me :path) [id])
				:doc false
				;dfn))
	:prefix (fn [me &opt sep mode]
				(string/join (map (or mode :say) (me :path))
							 (or sep "_")))))

(defn cache [gen &opt ident]
	(var idx 0)
	(def box @{})
	(fn [& argv]
		(def sig (if (nil? ident) argv
					 (ident ;argv)))
		(if-let [val (get box sig)] val
			(let [new-val (gen idx ;argv)]
				(set idx (+ 1 idx))
				(put box sig new-val)
				new-val))))

(defn cache/of-fn [pfx &opt inst] (cache
	(fn [idx & argv] # gen
		(def id (string/format "_priv_%s_%x" pfx idx))
		(when inst (inst id ;argv))
		id)
	(fn [sig & _] sig))) # ident

(defn gdtype->vartype [t] (match t
	[:array      _] :array
	[:dictionary _] :dictionary
	[:ref        _] :object
	x (keyword x)))
(defn gdtype->ctype [t]
	(match t
		:void        :void
		:float       :double
		:int         :int64_t
		:bool        :bool
		[:array      _] :gd_array
		[:dictionary _] :gd_dictionary
		[:ref        _] :GDExtensionObjectPtr

		# use an opaque wrapper struct defined in interface.h
		x (string "gd_" (:say (:read <sym> t)))))

(defmacro over [acc init binds & body]
	(def acc (if (= acc :) (gensym) acc))
	~(do (var ,acc ,init)
		 (loop ,binds
			 (set ,acc (do ,;body)))
		 ,acc))


(defn unit-files [u]
	(def h @[ `#pragma once` `#include "gdjn.h"` `#include "util.h"`
			 ;(u :header-prefix)])
	(def c @[
		(string `#include "` (:stab (u :name)) `.h"`)
		`typedef struct gdjn_vcall {`
		`	GDExtensionClassMethodPtrCall caller; `
		`	void* tgt;`
		`} gdjn_vcall;`
		;(u :impl-prefix)
	])

	(defn print-docs [dest obj]
		(when-let [dox (get (u :doc) obj)]
			(array/concat dest (fmt-docs dox))))
	(each t (u :types)
		(def [f-dec f-def f-doc]
			(case (t :mode)
				:pub [h h h]
				:priv [c c c]
				:opaq [h c c]))
		(print-docs f-doc t)
		(array/concat f-dec (:declare t))
		(array/concat f-def (:define t)))

	# forward-declare private funcs
	(each func (u :funcs)
		(when (has-value? (func :quals) :static)
			(array/join c (:declare* func))))

	(each v (u :vars)
		(when (not (v :priv))
			(print-docs h v)
			(array/push h (string/format "extern typeof(%s) %s;"
										 (v :t) (v :id))))
		(def init (let [val (v :v)] (cond
			(     nil? val) ""
			( keyword? val) (string " = " val)
			(  string? val) (string/format ` = %q` val)
			(function? val) (string " = " (val)) )))

		(when (v :priv) (print-docs c v))
		(array/push c (string/format "%stypeof(%s) %s%s;"
									 (if (v :priv) "static " "")
									 (v :t) (v :id) init)))

	(defn func-push [func]
		(array/join h (:declare func))
		(array/join c (:define func)))

	(each func (u :funcs)
		(print-docs (if (func :priv) c h) func)
		(func-push func))

	(let [fname (string "gdjn_unit_" (:say (u :name)) "_load")]
		(func-push (:dec <func-c> :void fname []
						 ;(indent 0 (u :load)))))
	{:header h :impl c})

(defn with-names [kv & body]
	(def [start end] [@[] @[]])
	(loop [[k v] :pairs (struct ;kv)]
		(def v-rep (cond (keyword? v) (string v)
		                 (string/format "%q" v)))
		(array/push start
					(string "gd_stringName " k ";")
					(string/format "_t(stringName).newWithUtf8Chars(&%s, %s);"
						k v-rep))
		(array/push end
					(string/format "_t(stringName).dtor(&%s);" k)))
	(tuple/join ["{"]
				(indent 1 start)
				body
				(indent 1 (reverse end))
				["}"]))

(defn variant-type-enum [sym]
	(def s (cond (:is? <sym> sym)    sym
			     (or (keyword? sym)
				     (string? sym)) (:read <sym> sym)
				(:read <sym> (gdtype->vartype sym))))
	(when (= :variant (:stab s))
		(error "value is already a variant"))
	(string "GDEXTENSION_VARIANT_TYPE_"
			(:scream s)))

(defn func-ptr-t [ret args]
	(defn wt [t]
		(string "typeof(" t ")"))
	(string/format "typeof(%s (*)(%s))"
				   (wt ret)
				   (if (empty? args) "void"
					   (string/join (map wt args) ", "))))
(defn lines->str [lines]
	(string (string/join lines "\n") "\n"))

(defn basename [p]
	(last (string/split "/" p)))
(defn entry [_ inp emit]
	(def ast (with [fd (file/open inp :r)]
				 (with-dyns [*src-file* inp]
					 (parse-class (:read fd :all)))))

	(def unit
		(let [unit-funcs @[]
			  unit-vars @[]
			  unit-load @[] ]
			(defn unit-variant-inst [kind]
				(when (= kind :variant)
					(error "cannot rewrap a variant"))
				(def modes
					{:cast {:call "cast"
							:type "GDExtensionTypeFromVariantConstructorFunc"}
					 :wrap {:call "wrap"
							:type "GDExtensionVariantFromTypeConstructorFunc"}})
				(def mode (in modes kind))
				(fn [id ty]
					(def ty-sym (:read <sym> (gdtype->vartype ty)))
					(def ty-enum (variant-type-enum ty-sym))
					(array/push unit-vars
								{:id id :priv true :v :nullptr
								 :t (mode :type)})
					(array/push unit-load
								(string/format `%s = gdjn_ctx -> gd.%s(%s);`
											   id (mode :call) ty-enum))))
			
			(def unit-variant-wrap
				(cache/of-fn "variant_wrap" (unit-variant-inst :wrap)))
			(def unit-variant-cast
				(cache/of-fn "variant_cast" (unit-variant-inst :cast)))


			(defn unit-invocant-ptr-inst [id [t-ret t-args]]
				(def invoke-args '[
				   # in
				   [void*                            target]
				   [GDExtensionClassInstancePtr        inst]
				   ["const GDExtensionConstTypePtr*"   argv]
				   # out
				   [GDExtensionTypePtr ret]])
				(def args* 
					(seq [i :range [0 (length t-args)]
						  :let   [a (t-args i)     ]]
						(string/format "*((%s*)argv[%d])" (gdtype->ctype a) i)))
				(def fn-t (func-ptr-t (gdtype->ctype t-ret)
									  [:void* ;(map gdtype->ctype t-args)]))
				(def arg-str (string/join ["inst" ;args*] ", "))
				(def invoke [
							 (string "typedef " fn-t " ptrCallFn;")
							 (string "ptrCallFn func = target;")
							 (string (if (= :void t-ret) ""
										 "auto rv = ") "func(" arg-str ");")
							 ;(if (= :void t-ret) [] [
								"* (typeof(rv)*) ret = rv;"])])
				(array/push unit-funcs
							(:dec- <func-c> :void id invoke-args
								   ;invoke)))
			(defn unit-invocant-inst [id [t-ret t-args]]
				(def invoke-args '[
				   # in
				   [void*                             target]
				   [GDExtensionClassInstancePtr         inst]
				   ["const GDExtensionConstVariantPtr*" argv]
				   [GDExtensionInt                      argc]
				   # out
				   [GDExtensionVariantPtr ret]
				   [GDExtensionCallError* err]])

				(defn call-err [kind & params]
					(let [kind-sym (:read <sym> kind)
						  enum (string "GDEXTENSION_CALL_ERROR_"
									   (:scream kind-sym))
						  p (struct ;params)]
						[(string `err -> error = ` enum `;`)
						 ;(map (fn[[k v]]
								   (string `err -> ` k ` = ` v `;`))
							   (pairs p))
						 `return;`]))

				(defn arity-enforce [m &opt x]
					[(string/format `if (argc < %d) {` m)
						;(indent 1 (call-err :too-few-arguments :expected m))
					 (string/format `} else if (argc > %d) {` (or x m))
						;(indent 1 (call-err :too-many-arguments :expected (or x m)))
					`}`])
				(defn unwrap-type [n]
					(def var-t (gdtype->vartype (t-args n)))
					(def tsym (:read <sym> var-t))
					(def tenum (variant-type-enum tsym))
					(def unwrap (unit-variant-cast var-t))
					[(string/format
						 `if (_t(variant).getType(argv[%d]) != %s) {`
						 n tenum)
					 ;(indent 1 (call-err :invalid-argument
										  :expected tenum
										  :argument n))
					 `}`
					 (string (gdtype->ctype (t-args n))
							 " arg_" n ";")

					 (string/format "%s(&arg_%d, (void*)argv[%d]);" unwrap n n)
					 ])

				(def invoke
					(let [tx (fn (t)
							  (string "typeof(" (gdtype->ctype t) ")"))
						  wrapper (cond (= t-ret :void)    nil
									    (= t-ret :variant) nil
									  (unit-variant-wrap t-ret))]
						[(string/format "typedef %s wrappedFunc;"
							(func-ptr-t (gdtype->ctype t-ret) [:void*
											   ;(map gdtype->ctype t-args)]))
						 (string/format "%s((wrappedFunc)target)(%s);"
							(if (= t-ret :void) ""
								(string (tx t-ret) " result = "))
							(string/join ["inst"
										  ;(seq [i :range [0 (length t-args)]]
											 (string "arg_" i))]
										 ", "))
							(cond (= t-ret :variant) "*(gd_variant*)ret = result;"
								wrapper (string wrapper "(ret, &result);")
								"")
						]))
				(array/push unit-funcs
							(:dec- <func-c> :void id invoke-args
								   ;(arity-enforce (length t-args))
								   ;(tuple/join ;(map |(unwrap-type $)
													 (range (length t-args))))
								   ;invoke)))
			(def unit-invocants (cache/of-fn "invoke" unit-invocant-inst))
			(def unit-invocants-ptr (cache/of-fn "invoke_ptr"
												 unit-invocant-ptr-inst))

			{:name         (:read <sym> (first (string/split "." (basename inp))))
			 :vars          unit-vars
			 :funcs         unit-funcs
			 :load          unit-load
			 :header-prefix @[]
			 :impl-prefix   @[]
			 :variant-wrap  unit-variant-wrap
			 :variant-cast  unit-variant-cast
			 :invocants     unit-invocants
			 :invocants-ptr unit-invocants-ptr
			 :classes       @[]
			 :methods       @[]
			 :types         @[]
			 :doc           @{}}))


	(defn process [n csr]
		(match n
			[[:doc & lines] & node]
				(let [doc-csr (:new csr :doc lines)]
					(process node doc-csr))

			([cl id imode base body] (or (= cl :class) (= cl :iface)))
				(let [class-def {:id id
								 :base base
								 :cursor csr
								 :events @{}
								 :fields @[]
								 :methods @[]
								 :vtbl-map @{}
								 :impls @[]
								 :base-mode imode
								 :abstract (= cl :iface)}
					  id-sym   (:read <sym> id)
					  base-sym (:read <sym> base)
					  subcsr   (:branch csr id-sym
										:class class-def)]
					(array/push (unit :classes) class-def)
					(each n body (process n subcsr)))
			([:var t-c t-gd id] (has-key? csr :class))
				(array/push (get-in csr [:class :fields])
							{:id id :cursor csr
							 :t-gd t-gd
							 :t-c (match t-c
									:auto (gdtype->ctype t-gd)
									t t)})
			[:var t-c t-gd id] (do
				(assert (= t-gd :priv)
					"static globals cannot currently be exposed to godot")
				(array/push (unit :vars)
							{:id (string "gdjn_unit_" (:say (unit :name))
										 "_" (:prefix csr) id)
							 :cursor csr
							 :v (keyword "{}")
							 :t (match t-c
									:auto (gdtype->ctype t-gd)
									t t)}))
			[:import mode & what]
				(array/push (case mode
								:head (unit :header-prefix)
								:impl (unit :impl-prefix)) 
							(match what
								 [:loc header] (string `#include "` header `"`)
								 [:sys header] (string `#include <` header `>`)
								 [:lit body] body))
			[:event ev c]
				(do (assert (csr :class)
							(string "event " ev " defined outside of class"))
					(put-in csr [:class :events ev]
							{:cursor csr
							 :text c}))
			[:func kind id argv [rty & meta] c]
				(let [cls  (csr :class)
					  meth {:id id
							:args (map (fn [[t id & r]]
										   [t
											(keyword id) ;r]) argv)
							:ret rty
							:ret-doc (match (first meta)
										 [:doc & d] d)
							:cursor csr
							:text c}]
					(array/push (unit :methods) meth)
					(when cls (case kind
						:method (array/push (cls :methods) meth)
						:impl   (array/push (cls :impls)   meth)))
			)))

	(def root (:new <cursor> :unit unit))
	(each n ast (process n root))

	(defn class-prefix [c & r]
		(def pf (let [p (:prefix c)]
					(if (empty? p) [] [p])))
		(string/join ["gdjn_class" ;pf ;r] "_"))

	(defn bind-methods [class]
		(defn bind [f kind]
			(def t-args (map (fn [[t] &] t)
							 (f :args)))
			(def invocant
				((unit :invocants) [(f :ret) t-args]))
			(def invocant-ptr
				((unit :invocants-ptr) [(f :ret) t-args]))
			(def fp-t (func-ptr-t (gdtype->ctype (f :ret))
								  [(string "typeof("
										   (class-prefix (class :cursor)
														 (class :id))")*")
								   ;(map gdtype->ctype t-args)]))

			(def strings-lst @[])
			(def strings
				(cache (fn [idx text] 
						   (def id (string "_priv_str_" idx))
						   (array/push strings-lst id text)
						   id)))
			(defn prop-info [t &opt id] [
				"(GDExtensionPropertyInfo) {" ;(indent 1 [
					(if (= :variant t) ""
						(string ".type = " (variant-type-enum t) ","))
					(string ".name = &" (strings (if (nil? id) ""
													 (string id))) ",")
					(string ".class_name = &" (strings (match t
						  [:ref c] (string (:tall (:read <sym> c)))
						  _        "")) ",")
					(string ".hint_string = &" (strings "") ",")
						`.usage = 6,` # DEFAULT
				]) "}"
			])
			(def arg-info (if (empty? t-args) [] [
				(string "." (case kind
								:method "arguments_info"
								:impl "arguments")
						"= (GDExtensionPropertyInfo[]) {")
				;(indent 1 (mapcat (fn [[t id]] [;(prop-info t id) ","]) (f :args)))
				"},"
				".arguments_metadata = (GDExtensionClassMethodArgumentMetadata[]) {"
				;(seq [i :range [0 (length (f :args))]]
					"\tGDEXTENSION_METHOD_ARGUMENT_METADATA_NONE,")
				"},"
			]))
			(def ret-info
				(indent 1 [`.return_value_metadata = GDEXTENSION_METHOD_ARGUMENT_METADATA_NONE,`
				   ;(case kind
						:method (if (= :void (f :ret)) []
									 [`.return_value_info = &`
									 ;(prop-info (f :ret))
									 `,`])
						:impl [`.return_value = ` 
							   ;(prop-info (if (= :void (f :ret)) :nil
											   (f :ret)))]
					)])
				)

			(def fn-path (class-prefix (f :cursor) "method" (f :id)))
			(with-names [:s_methodName (f :id) ;strings-lst]
				(if (not= kind :method) ""
					(string fp-t " func = " fn-path ";"))
				(string/format `auto info = (%s) {`
					(case kind
						:method "GDExtensionClassMethodInfo"
						:impl "GDExtensionClassVirtualMethodInfo"))
				`	.name = &s_methodName,`
				(string "\t.argument_count = "
						(length t-args) ",")
				;(indent 1 arg-info)
				;(if (= kind :method) [
					`	.method_userdata = func,`
					`	.method_flags = GDEXTENSION_METHOD_FLAGS_DEFAULT,`
					(string "\t.has_return_value = "
							(if (= :void (f :ret)) "false" "true") ",")
					(string "\t.call_func = " invocant ",")
					(string "\t.ptrcall_func = " invocant-ptr ",")
				] [])
				;ret-info
				`};`
				(string `printf("binding method %s\n",`
						(string/format "%q" fn-path)
						`);`)
				(string `_t(classdb).`
						(case kind
							:method "registerExtensionClassMethod"
							:impl "registerExtensionClassVirtualMethod")
						`(gdjn_ctx -> gd.lib, &s_className, &info);`)))
	   (array/concat @[] "{" ;(with-names [:s_className (class :id)]
				 ;(map |(bind $ :method) (class :methods))
				 ;(map |(bind $ :impl) (class :impls))) "}"))

	(defn push-item [kind cursor item] # abuse hashtables for fun & profit
		(array/push (unit kind) item)
		(when (and cursor (cursor :doc))
			(put (unit :doc) item (cursor :doc))))

	(loop [c :in (unit :classes)]
		(def id (class-prefix (c :cursor) (c :id)))
		(def [id-ctor id-dtor
			  id-ctor-api
			  id-init id-create]
			(map |(string id  "_" $) ["new"     "del"
									  "api_new" "init" "create"]))

		(def id-base (as-> (c :base) b
						   (string/split "." b)
						   (string/join b "_")
						   (string "gdjn_class_" b))) #HAAACK
		(when (not (empty? (c :impls)))
			(def vtbl @[])
			(loop [i :range [0 (length (c :impls))]
				     :let   [f ((c :impls) i)]]
				(def t-args (map (fn [[t] &] t)
								 (f :args)))
				(def call   (class-prefix (f :cursor) "method" (f :id)))
				(def caller ((unit :invocants-ptr) [(f :ret) t-args]))
				(put (c :vtbl-map) (f :id) i)
				(array/push vtbl
							(string "{.caller=" caller ", .tgt=" call "}"))
				)
			(let [vstr (string/join (map |(string "\n\t" $ ",") vtbl))
				  vwr (string "{" vstr "\n}") ]
				(array/push (unit :vars)
							{:id (string id "_vtbl")
							 :priv true
							 :t "const gdjn_vcall[]"
							 :v |vwr})))

		(defn push-event [ev-kind ev-id ret-t args gen]
			(push-item :funcs (get-in c [:events ev-kind :cursor])
					   (:dec <func-c> ret-t ev-id 
							 args
							 ;(gen (if c ["{" (get-in c [:events ev-kind :text] "") "}"] [])))))
		(array/push (unit :funcs)
					(:dec <func-c> :GDExtensionObjectPtr id-ctor-api
						  [[:void* :_data]
						   [:GDExtensionBool :postInit]]
						  (string/format "return %s() -> self;" id-ctor)))
		(def self-ref-t (string "typeof(" id ")*"))
		(push-event :ctor id-init :void [[self-ref-t            :me]
										 [:GDExtensionObjectPtr :obj]]
					|[(string/format "me -> self = obj;")
					  ;(if (= :native (c :base-mode)) []
							[(string id-base "_init(&me -> super, obj);")])
					 ;$])
		(array/push (unit :funcs)
					(:dec <func-c> :GDExtensionObjectPtr id-create []
						  "GDExtensionObjectPtr super;"
						   ;(if (= :native (c :base-mode))
							   (with-names ["superName" (c :base)]
								   "super = _t(classdb).constructObject(&superName);")
							   [(string/format "super = %s_create();"
											   id-base)])
						   "return super;"))

		(array/push (unit :funcs)
					(:dec <func-c> self-ref-t id-ctor []
					  (string "typeof("id")* me = _alloc("id", 1);")
					  ;(with-names ["className" (c :id)]
						   (string/format "auto gdobj = %s();"
										  id-create)
						   `printf("constructed super object %p\n", gdobj);`
						   "_t(object).setInstance(gdobj, &className, me);"
						   (string id-init "(me, gdobj);"))
					  "return me;"))
		(push-event :dtor id-dtor :void
					[[:void* :_data]
					 [:GDExtensionClassInstancePtr :_ptr_me]]
					|[(string "typeof("id")* me = _ptr_me;")
					  ;$
					  "_free(me);"])
		(def id-virt (class-prefix (c :cursor) (c :id) "virt"))

		(array/push (unit :funcs) (:dec- <func-c> :void* id-virt
			 [[:void* :data]
			  [:GDExtensionConstStringNamePtr :method]
			  [:uint32_t :hash]]
			 `bool res = false;`
			 ;(catseq [[name idx] :pairs (c :vtbl-map)] [
					  ;(with-names [:name name]
					  `_t(stringName).equal(&name, method, &res);`
						  `if (res) {`
							  (string "\treturn (void*)&" id "_vtbl[" idx "];")
						  `}`)])
			 ;(if (= :native (c :base-mode)) [`return nullptr;`]
				  # inherits from a gdextension class; call up
				  [(string/format "return %s_virt(data, method, hash);"
								  id-base)])
			 ))
		(def id-virt-call (class-prefix (c :cursor) (c :id) "virt_call"))
		(array/push (unit :funcs) (:dec- <func-c> :void id-virt-call
			 [[:GDExtensionClassInstancePtr   :inst]
			  [:GDExtensionConstStringNamePtr :method]
			  [:void* :vcall]
			  ["const GDExtensionConstTypePtr*" :args]
			  [:GDExtensionTypePtr :ret]]
			 `auto c = (const gdjn_vcall*)vcall;`
			 `c -> caller(c -> tgt, inst, args, ret);`))
		(array/push (unit :load)
					;(with-names ["className" (c :id)
								  "superName" (c :base)]
						 "auto classDesc = (GDExtensionClassCreationInfo4) {"
						 `	.is_virtual = false,`
						 (string "\t.is_abstract = " (if (c :abstract)  "true" "false")",")
						 `	.is_exposed = true,`
						 `	.is_runtime = true,`
						 (string "\t.create_instance_func = " id-ctor-api ",")
						 (string "\t.free_instance_func   = " id-dtor ",")
						 (string "\t.get_virtual_call_data_func = "
								 id-virt ",")
						 (string "\t.call_virtual_with_data_func = "
								 id-virt-call ",")
						 "};"
						 `_t(classdb).registerExtensionClass(gdjn_ctx -> gd.lib, &className, &superName, &classDesc);`
					))
		(def fields
			(tuple/join (if (= :native (c :base-mode)) []
							 [{:id "super"
							   :t id-base}])
						[{:id "self" :t :GDExtensionObjectPtr}]
						(seq [f :in (c :fields)]
							{:id (f :id)
							 :t (f :t-c) :v {}
							 :doc (get-in f [:cursor :doc] nil)})))
		(push-item :types (c :cursor)
					(:dec <struct-c> id
						  fields))
		(def binder (bind-methods c))
		(array/concat (unit :load) binder)



		)
	(loop [f :in (unit :methods)]
		(def class (class-prefix (f :cursor)))
		(def cid (class-prefix (f :cursor) "method" (f :id)))
		(def cfn (:dec <func-c> (gdtype->ctype (f :ret)) cid
					   [ [(string class "*") "me"]
						;(map (fn [[t id dox]]
								  [(gdtype->ctype t) id])
							  (f :args))]
					   (f :text)))
		(def arg-dox
			(mapcat (fn [[t id & meta]]
				(match (first meta)
					([:doc & dox] (not (empty? dox)))
						(do (def pfx (string "@param " id " "))
							(def pad (string/repeat " " (length pfx)))
							[(string pfx (first dox))
							 ;(map |(string pad $) (slice dox 1))])
					_ []))
				(f :args)))
		(let [func-dox (if-let [x (get-in f [:cursor :doc])]
						   (tuple/join x [""])
						   [])
			  ret-dox (if-let [x (f :ret-doc)]
						  [(string "@return " (first x))
						   ;(if (= (length x) 1) []
								(map |(string "        " $) (slice x 1)))]
						  [])
			  curs (if (empty? arg-dox) (f :cursor)
					   (:new (f :cursor)
							 :doc (tuple/join func-dox
											  arg-dox
											  ret-dox)))]
			(push-item :funcs curs cfn))
		)

	(let [uf (unit-files unit)]
		(:write stdout (case emit
			"header" (lines->str (uf :header))
			"loader" (lines->str (uf :impl))
			(error :bad-cmd)))))

(defn main [& argv]
	# (entry ;argv))
	(try (entry ;argv)
		([e] (:write stderr (style ;(err->msg e))))))

# [ʞ] rsrc.janet
#  ~ lexi hale <lexi@hale.su>
#  ? the usual bullshit
#  > CC=cc gd_build_out=out gd_build_gen=gen
#    janet rsrc.janet -- <file> <file>...

(def *cc*       (gensym))
(def *out-path* (gensym))
(def *gen-path* (gensym))

(defn blob->c-array [data]
	(def bytes (string/bytes data))
	(def buf @"")
	(defn nl [] (buffer/push buf "\n"))

	(loop [i :range [0 (length bytes)]
		     :let   [col (mod i 20)
				     val (data i)]
		     :after (when (= col 0) (nl))]
		(buffer/push buf (string/format "%d," val)))

	(string buf))

(defn basename [f] (array/peek (string/split "/" f)))

(defn blob [path]
	(print "doing path " path)
	(let [fd (file/open path :r) 
		  rec {:id (reduce |(string/replace-all $1 "_" $0)
						   (basename path) ["-" "." "/"])
			   :vals (blob->c-array (:read fd :all))}]
		(:close fd)
		rec))

(defn c-decl [t]
	(string "const uint8_t gdjn_rsrc_" (t :id) " []"))
(defn c-def [t]
	(string (c-decl t) " = {" (t :vals) "}"))


(defn c-compile [c to-path]
	(def cc (os/spawn [(dyn *cc*)
					   "-xc" "-c" "-"
					         "-o" to-path]
					  :p {:in :pipe}))
	(ev/gather (do (:write (cc :in)
						"#include <stdint.h>\n")
				   (ev/write (cc :in) c)
				   (ev/close (cc :in)))
			   (os/proc-wait cc)))

(defn build [paths]
	(let [      lst (map blob (slice paths 2 -1))
		       decl (map |(string (c-decl $) ";\n") lst)
		       impl (map |(string (c-def  $) ";\n") lst)
	       obj-path (string/format "%s/rsrc.o" (dyn *out-path*))
		  decl-path (string/format "%s/rsrc.h" (dyn *gen-path*))
		    decl-fd (file/open decl-path :w)]
		(:write decl-fd
			"#pragma once\n"
			"#include <stdint.h>\n")
		(each d decl (:write decl-fd d))
		(each i impl (c-compile i obj-path))
		(:close decl-fd)))

(defn env: [k dflt]
	(or (get (os/environ) k) dflt))

(defn main [& argv]
	(with-dyns [      *cc* (env: "CC"           "cc" )
				*out-path* (env: "gd_build_out" "out")
				*gen-path* (env: "gd_build_gen" "gen")]
		(build argv))
	0)