genas3.ml

(*
	The Haxe Compiler
	Copyright (C) 2005-2015  Haxe Foundation

	This program is free software; you can redistribute it and/or
	modify it under the terms of the GNU General Public License
	as published by the Free Software Foundation; either version 2
	of the License, or (at your option) any later version.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
	GNU General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with this program; if not, write to the Free Software
	Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *)

open Type
open Common

type context_infos = {
	com : Common.context;
}

type context = {
	inf : context_infos;
	ch : out_channel;
	buf : Buffer.t;
	path : path;
	mutable get_sets : (string * bool,string) Hashtbl.t;
	mutable curclass : tclass;
	mutable tabs : string;
	mutable in_value : tvar option;
	mutable in_static : bool;
	mutable handle_break : bool;
	mutable imports : (string,string list list) Hashtbl.t;
	mutable gen_uid : int;
	mutable local_types : t list;
	mutable constructor_block : bool;
	mutable block_inits : (unit -> unit) option;
}

let follow = Abstract.follow_with_abstracts

let is_var_field f =
	match f with
	| FStatic (_,f) | FInstance (_,_,f) ->
		(match f.cf_kind with Var _ | Method MethDynamic -> true | _ -> false)
	| _ ->
		false

let is_special_compare e1 e2 =
	match e1.eexpr, e2.eexpr with
	| TConst TNull, _  | _ , TConst TNull -> None
	| _ ->
	match follow e1.etype, follow e2.etype with
	| TInst ({ cl_path = ["flash"],"NativeXml" } as c,_) , _ | _ , TInst ({ cl_path = ["flash"],"NativeXml" } as c,_) -> Some c
	| _ -> None

let is_fixed_override cf t =
	let is_type_parameter c = match c.cl_kind with
		| KTypeParameter _ -> true
		| _ -> false
	in
	match follow cf.cf_type,follow t with
	| TFun(_,r1),TFun(_,r2) ->
		begin match follow r1,follow r2 with
		| TInst(c1,_),TInst(c2,_) when c1 != c2 && not (is_type_parameter c1) && not (is_type_parameter c2) -> true
		| _ -> false
		end
	| _ ->
		false

let protect name =
	match name with
	| "Error" | "Namespace" -> "_" ^ name
	| _ -> name

let s_path ctx stat path p =
	match path with
	| ([],name) ->
		(match name with
		| "Int" -> "int"
		| "Float" -> "Number"
		| "Dynamic" -> "Object"
		| "Bool" -> "Boolean"
		| "Enum" -> "Class"
		| "EnumValue" -> "enum"
		| _ -> name)
	| (["flash"],"FlashXml__") ->
		"Xml"
	| (["flash";"errors"],"Error") ->
		"Error"
	| (["flash"],"Vector") ->
		"Vector"
	| (["flash";"xml"],"XML") ->
		"XML"
	| (["flash";"xml"],"XMLList") ->
		"XMLList"
	| ["flash";"utils"],"QName" ->
		"QName"
	| ["flash";"utils"],"Namespace" ->
		"Namespace"
	| (["haxe"],"Int32") when not stat ->
		"int"
	| (pack,name) ->
		let name = protect name in
		let packs = (try Hashtbl.find ctx.imports name with Not_found -> []) in
		if not (List.mem pack packs) then Hashtbl.replace ctx.imports name (pack :: packs);
		Ast.s_type_path (pack,name)

let reserved =
	let h = Hashtbl.create 0 in
	List.iter (fun l -> Hashtbl.add h l ())
	(* these ones are defined in order to prevent recursion in some Std functions *)
	["is";"as";"int";"uint";"const";"getTimer";"typeof";"parseInt";"parseFloat";
	(* AS3 keywords which are not Haxe ones *)
	"finally";"with";"final";"internal";"native";"namespace";"include";"delete";
	(* some globals give some errors with Flex SDK as well *)
	"print";"trace";
	(* we don't include get+set since they are not 'real' keywords, but they can't be used as method names *)
	"function";"class";"var";"if";"else";"while";"do";"for";"break";"continue";"return";"extends";"implements";
	"import";"switch";"case";"default";"static";"public";"private";"try";"catch";"new";"this";"throw";"interface";
	"override";"package";"null";"true";"false";"void"
	];
	h

	(* "each", "label" : removed (actually allowed in locals and fields accesses) *)

let s_ident n =
	if Hashtbl.mem reserved n then "_" ^ n else n

let valid_as3_ident s =
	try
		for i = 0 to String.length s - 1 do
			match String.unsafe_get s i with
			| 'a'..'z' | 'A'..'Z' | '$' | '_' -> ()
			| '0'..'9' when i > 0 -> ()
			| _ -> raise Exit
		done;
		true
	with Exit ->
		false

let anon_field s =
	let s = s_ident s in
	if not (valid_as3_ident s) then "\"" ^ s ^ "\"" else s

let rec create_dir acc = function
	| [] -> ()
	| d :: l ->
		let dir = String.concat "/" (List.rev (d :: acc)) in
		if not (Sys.file_exists dir) then Unix.mkdir dir 0o755;
		create_dir (d :: acc) l

let init infos path =
	let dir = infos.com.file :: fst path in
	create_dir [] dir;
	let ch = open_out (String.concat "/" dir ^ "/" ^ snd path ^ ".as") in
	let imports = Hashtbl.create 0 in
	Hashtbl.add imports (snd path) [fst path];
	{
		inf = infos;
		tabs = "";
		ch = ch;
		path = path;
		buf = Buffer.create (1 lsl 14);
		in_value = None;
		in_static = false;
		handle_break = false;
		imports = imports;
		curclass = null_class;
		gen_uid = 0;
		local_types = [];
		get_sets = Hashtbl.create 0;
		constructor_block = false;
		block_inits = None;
	}

let close ctx =
	begin match ctx.inf.com.main_class with
		| Some tp when tp = ctx.curclass.cl_path ->
			output_string ctx.ch "// Compile __main__.as instead\n";
		| _ ->
			()
	end;
	output_string ctx.ch (Printf.sprintf "package %s {\n" (String.concat "." (fst ctx.path)));
	Hashtbl.iter (fun name paths ->
		List.iter (fun pack ->
			let path = pack, name in
			if path <> ctx.path then output_string ctx.ch ("\timport " ^ Ast.s_type_path path ^ ";\n");
		) paths
	) ctx.imports;
	output_string ctx.ch (Buffer.contents ctx.buf);
	close_out ctx.ch

let gen_local ctx l =
	ctx.gen_uid <- ctx.gen_uid + 1;
	if ctx.gen_uid = 1 then l else l ^ string_of_int ctx.gen_uid

let spr ctx s = Buffer.add_string ctx.buf s
let print ctx = Printf.kprintf (fun s -> Buffer.add_string ctx.buf s)

let unsupported p = error "This expression cannot be generated to AS3" p

let newline ctx =
	let rec loop p =
		match Buffer.nth ctx.buf p with
		| '}' | '{' | ':' | ';' -> print ctx "\n%s" ctx.tabs
		| '\n' | '\t' -> loop (p - 1)
		| _ -> print ctx ";\n%s" ctx.tabs
	in
	loop (Buffer.length ctx.buf - 1)

let block_newline ctx = match Buffer.nth ctx.buf (Buffer.length ctx.buf - 1) with
	| '}' -> print ctx ";\n%s" ctx.tabs
	| _ -> newline ctx

let rec concat ctx s f = function
	| [] -> ()
	| [x] -> f x
	| x :: l ->
		f x;
		spr ctx s;
		concat ctx s f l

let open_block ctx =
	let oldt = ctx.tabs in
	ctx.tabs <- "\t" ^ ctx.tabs;
	(fun() -> ctx.tabs <- oldt)

let parent e =
	match e.eexpr with
	| TParenthesis _ -> e
	| _ -> mk (TParenthesis e) e.etype e.epos

let default_value tstr =
	match tstr with
	| "int" | "uint" -> "0"
	| "Number" -> "NaN"
	| "Boolean" -> "false"
	| _ -> "null"

let rec type_str ctx t p =
	match t with
	| TEnum _ | TInst _ when List.memq t ctx.local_types ->
		"*"
	| TAbstract (a,pl) when not (Ast.Meta.has Ast.Meta.CoreType a.a_meta) ->
		type_str ctx (Abstract.get_underlying_type a pl) p
	| TAbstract (a,_) ->
		(match a.a_path with
		| [], "Void" -> "void"
		| [], "UInt" -> "uint"
		| [], "Int" -> "int"
		| [], "Float" -> "Number"
		| [], "Bool" -> "Boolean"
		| _ -> s_path ctx true a.a_path p)
	| TEnum (e,_) ->
		if e.e_extern then (match e.e_path with
			| [], "Void" -> "void"
			| [], "Bool" -> "Boolean"
			| _ ->
				let rec loop = function
					| [] -> "Object"
					| (Ast.Meta.FakeEnum,[Ast.EConst (Ast.Ident n),_],_) :: _ ->
						(match n with
						| "Int" -> "int"
						| "UInt" -> "uint"
						| _ -> n)
					| _ :: l -> loop l
				in
				loop e.e_meta
		) else
			s_path ctx true e.e_path p
	| TInst ({ cl_path = ["flash"],"Vector" },[pt]) ->
		(match pt with
		| TInst({cl_kind = KTypeParameter _},_) -> "*"
		| _ -> "Vector.<" ^ type_str ctx pt p ^ ">")
	| TInst (c,_) ->
		(match c.cl_kind with
		| KNormal | KGeneric | KGenericInstance _ | KAbstractImpl _ -> s_path ctx false c.cl_path p
		| KTypeParameter _ | KExtension _ | KExpr _ | KMacroType | KGenericBuild _ -> "*")
	| TFun _ ->
		"Function"
	| TMono r ->
		(match !r with None -> "*" | Some t -> type_str ctx t p)
	| TAnon _ | TDynamic _ ->
		"*"
	| TType (t,args) ->
		(match t.t_path with
		| [], "UInt" -> "uint"
		| [] , "Null" ->
			(match args with
			| [t] ->
				(match follow t with
				| TAbstract ({ a_path = [],"UInt" },_)
				| TAbstract ({ a_path = [],"Int" },_)
				| TAbstract ({ a_path = [],"Float" },_)
				| TAbstract ({ a_path = [],"Bool" },_)
				| TInst ({ cl_path = [],"Int" },_)
				| TInst ({ cl_path = [],"Float" },_)
				| TEnum ({ e_path = [],"Bool" },_) -> "*"
				| _ -> type_str ctx t p)
			| _ -> assert false);
		| _ -> type_str ctx (apply_params t.t_params args t.t_type) p)
	| TLazy f ->
		type_str ctx ((!f)()) p

let rec iter_switch_break in_switch e =
	match e.eexpr with
	| TFunction _ | TWhile _ | TFor _ -> ()
	| TSwitch _ when not in_switch -> iter_switch_break true e
	| TBreak when in_switch -> raise Exit
	| _ -> iter (iter_switch_break in_switch) e

let handle_break ctx e =
	let old_handle = ctx.handle_break in
	try
		iter_switch_break false e;
		ctx.handle_break <- false;
		(fun() -> ctx.handle_break <- old_handle)
	with
		Exit ->
			spr ctx "try {";
			let b = open_block ctx in
			newline ctx;
			ctx.handle_break <- true;
			(fun() ->
				b();
				ctx.handle_break <- old_handle;
				newline ctx;
				spr ctx "} catch( e : * ) { if( e != \"__break__\" ) throw e; }";
			)

let this ctx = if ctx.in_value <> None then "$this" else "this"

let generate_resources infos =
	if Hashtbl.length infos.com.resources <> 0 then begin
		let dir = (infos.com.file :: ["__res"]) in
		create_dir [] dir;
		let add_resource name data =
			let name = Base64.str_encode name in
			let ch = open_out_bin (String.concat "/" (dir @ [name])) in
			output_string ch data;
			close_out ch
		in
		Hashtbl.iter (fun name data -> add_resource name data) infos.com.resources;
		let ctx = init infos ([],"__resources__") in
		spr ctx "\timport flash.utils.Dictionary;\n";
		spr ctx "\tpublic class __resources__ {\n";
		spr ctx "\t\tpublic static var list:Dictionary;\n";
		let inits = ref [] in
		let k = ref 0 in
		Hashtbl.iter (fun name _ ->
			let varname = ("v" ^ (string_of_int !k)) in
			k := !k + 1;
			print ctx "\t\t[Embed(source = \"__res/%s\", mimeType = \"application/octet-stream\")]\n" (Base64.str_encode name);
			print ctx "\t\tpublic static var %s:Class;\n" varname;
			inits := ("list[\"" ^ Ast.s_escape name ^ "\"] = " ^ varname ^ ";") :: !inits;
		) infos.com.resources;
		spr ctx "\t\tstatic public function __init__():void {\n";
		spr ctx "\t\t\tlist = new Dictionary();\n";
		List.iter (fun init ->
			print ctx "\t\t\t%s\n" init
		) !inits;
		spr ctx "\t\t}\n";
		spr ctx "\t}\n";
		spr ctx "}";
		close ctx;
	end

let gen_constant ctx p = function
	| TInt i -> print ctx "%ld" i
	| TFloat s -> spr ctx s
	| TString s -> print ctx "\"%s\"" (Ast.s_escape s)
	| TBool b -> spr ctx (if b then "true" else "false")
	| TNull -> spr ctx "null"
	| TThis -> spr ctx (this ctx)
	| TSuper -> spr ctx "super"

let gen_function_header ctx name f params p =
	let old = ctx.in_value in
	let old_t = ctx.local_types in
	let old_bi = ctx.block_inits in
	ctx.in_value <- None;
	ctx.local_types <- List.map snd params @ ctx.local_types;
	let init () =
 		List.iter (fun (v,o) -> match o with
			| Some c when is_nullable v.v_type && c <> TNull ->
				newline ctx;
				print ctx "if(%s==null) %s=" v.v_name v.v_name;
				gen_constant ctx p c;
			| _ -> ()
		) f.tf_args;
		ctx.block_inits <- None;
	in
	ctx.block_inits <- Some init;
	print ctx "function%s(" (match name with None -> "" | Some (n,meta) ->
		let rec loop = function
			| [] -> n
			| (Ast.Meta.Getter,[Ast.EConst (Ast.Ident i),_],_) :: _ -> "get " ^ i
			| (Ast.Meta.Setter,[Ast.EConst (Ast.Ident i),_],_) :: _ -> "set " ^ i
			| _ :: l -> loop l
		in
		" " ^ loop meta
	);
	concat ctx "," (fun (v,c) ->
		match v.v_name with
			| "__arguments__" ->
				print ctx "...__arguments__"
			| _ ->
				let tstr = type_str ctx v.v_type p in
				print ctx "%s : %s" (s_ident v.v_name) tstr;
				match c with
				| None ->
					if ctx.constructor_block then print ctx " = %s" (default_value tstr);
				| Some c ->
					spr ctx " = ";
					gen_constant ctx p c
	) f.tf_args;
	print ctx ") : %s " (type_str ctx f.tf_type p);
	(fun () ->
		ctx.in_value <- old;
		ctx.local_types <- old_t;
		ctx.block_inits <- old_bi;
	)

let rec gen_call ctx e el r =
	match e.eexpr , el with
	| TCall (x,_) , el ->
		spr ctx "(";
		gen_value ctx e;
		spr ctx ")";
		spr ctx "(";
		concat ctx "," (gen_value ctx) el;
		spr ctx ")";
	| TLocal { v_name = "__is__" } , [e1;e2] ->
		gen_value ctx e1;
		spr ctx " is ";
		gen_value ctx e2;
	| TLocal { v_name = "__in__" } , [e1;e2] ->
		spr ctx "(";
		gen_value ctx e1;
		spr ctx " in ";
		gen_value ctx e2;
		spr ctx ")"
	| TLocal { v_name = "__as__" }, [e1;e2] ->
		gen_value ctx e1;
		spr ctx " as ";
		gen_value ctx e2;
	| TLocal { v_name = "__int__" }, [e] ->
		spr ctx "int(";
		gen_value ctx e;
		spr ctx ")";
	| TLocal { v_name = "__float__" }, [e] ->
		spr ctx "Number(";
		gen_value ctx e;
		spr ctx ")";
	| TLocal { v_name = "__typeof__" }, [e] ->
		spr ctx "typeof ";
		gen_value ctx e;
	| TLocal { v_name = "__keys__" }, [e] ->
		let ret = (match ctx.in_value with None -> assert false | Some r -> r) in
		print ctx "%s = new Array()" ret.v_name;
		newline ctx;
		let tmp = gen_local ctx "$k" in
		print ctx "for(var %s : String in " tmp;
		gen_value ctx e;
		print ctx ") %s.push(%s)" ret.v_name tmp;
	| TLocal { v_name = "__hkeys__" }, [e] ->
		let ret = (match ctx.in_value with None -> assert false | Some r -> r) in
		print ctx "%s = new Array()" ret.v_name;
		newline ctx;
		let tmp = gen_local ctx "$k" in
		print ctx "for(var %s : String in " tmp;
		gen_value ctx e;
		print ctx ") %s.push(%s.substr(1))" ret.v_name tmp;
	| TLocal { v_name = "__foreach__" }, [e] ->
		let ret = (match ctx.in_value with None -> assert false | Some r -> r) in
		print ctx "%s = new Array()" ret.v_name;
		newline ctx;
		let tmp = gen_local ctx "$k" in
		print ctx "for each(var %s : * in " tmp;
		gen_value ctx e;
		print ctx ") %s.push(%s)" ret.v_name tmp;
	| TLocal { v_name = "__new__" }, e :: args ->
		spr ctx "new ";
		gen_value ctx e;
		spr ctx "(";
		concat ctx "," (gen_value ctx) args;
		spr ctx ")";
	| TLocal { v_name = "__delete__" }, [e;f] ->
		spr ctx "delete(";
		gen_value ctx e;
		spr ctx "[";
		gen_value ctx f;
		spr ctx "]";
		spr ctx ")";
	| TLocal { v_name = "__unprotect__" }, [e] ->
		gen_value ctx e
	| TLocal { v_name = "__vector__" }, [e] ->
		spr ctx (type_str ctx r e.epos);
		spr ctx "(";
		gen_value ctx e;
		spr ctx ")"
	| TField (_, FStatic( { cl_path = (["flash"],"Lib") }, { cf_name = "as" })), [e1;e2] ->
		gen_value ctx e1;
		spr ctx " as ";
		gen_value ctx e2
	| TField (_, FStatic ({ cl_path = (["flash"],"Vector") }, cf)), args ->
		(match cf.cf_name, args with
		| "ofArray", [e] | "convert", [e] ->
			(match follow r with
			| TInst ({ cl_path = (["flash"],"Vector") },[t]) ->
				print ctx "Vector.<%s>(" (type_str ctx t e.epos);
				gen_value ctx e;
				print ctx ")";
			| _ -> assert false)
		| _ -> assert false)
	| TField(e1, (FAnon {cf_name = s} | FDynamic s)),[ef] when s = "map" || s = "filter" ->
		spr ctx (s_path ctx true (["flash";],"Boot") e.epos);
		gen_field_access ctx t_dynamic (s ^ "Dynamic");
		spr ctx "(";
		concat ctx "," (gen_value ctx) [e1;ef];
		spr ctx ")"
	| TField (ee,f), args when is_var_field f ->
		spr ctx "(";
		gen_value ctx e;
		spr ctx ")";
		spr ctx "(";
		concat ctx "," (gen_value ctx) el;
		spr ctx ")"
	| TField (e1,FInstance(_,_,cf)),el when is_fixed_override cf e.etype ->
		let s = type_str ctx r e.epos in
		spr ctx "((";
		gen_value ctx e;
		spr ctx "(";
		concat ctx "," (gen_value ctx) el;
		spr ctx ")";
		print ctx ") as %s)" s
	| _ ->
		gen_value ctx e;
		spr ctx "(";
		concat ctx "," (gen_value ctx) el;
		spr ctx ")"

and gen_value_op ctx e =
	match e.eexpr with
	| TBinop (op,_,_) when op = Ast.OpAnd || op = Ast.OpOr || op = Ast.OpXor ->
		spr ctx "(";
		gen_value ctx e;
		spr ctx ")";
	| _ ->
		gen_value ctx e

and gen_field_access ctx t s =
	let field c =
		match fst c.cl_path, snd c.cl_path, s with
		| [], "Math", "NaN"
		| [], "Math", "NEGATIVE_INFINITY"
		| [], "Math", "POSITIVE_INFINITY"
		| [], "Math", "isFinite"
		| [], "Math", "isNaN"
		| [], "Date", "now"
		| [], "Date", "fromTime"
		| [], "Date", "fromString"
		->
			print ctx "[\"%s\"]" s
		| [], "String", "charCodeAt" ->
			spr ctx "[\"charCodeAtHX\"]"
		| [], "Array", "map" ->
			spr ctx "[\"mapHX\"]"
		| [], "Array", "filter" ->
			spr ctx "[\"filterHX\"]"
		| [], "Date", "toString" ->
			print ctx "[\"toStringHX\"]"
		| [], "String", "cca" ->
			print ctx ".charCodeAt"
		| ["flash";"xml"], "XML", "namespace" ->
			print ctx ".namespace"
		| _ ->
			print ctx ".%s" (s_ident s)
	in
	match follow t with
	| TInst (c,_) -> field c
	| TAnon a ->
		(match !(a.a_status) with
		| Statics c -> field c
		| _ -> print ctx ".%s" (s_ident s))
	| _ ->
		print ctx ".%s" (s_ident s)

and gen_expr ctx e =
	match e.eexpr with
	| TConst c ->
		gen_constant ctx e.epos c
	| TLocal v ->
		spr ctx (s_ident v.v_name)
	| TArray ({ eexpr = TLocal { v_name = "__global__" } },{ eexpr = TConst (TString s) }) ->
		let path = Ast.parse_path s in
		spr ctx (s_path ctx false path e.epos)
	| TArray (e1,e2) ->
		gen_value ctx e1;
		spr ctx "[";
		gen_value ctx e2;
		spr ctx "]";
	| TBinop (Ast.OpEq,e1,e2) when (match is_special_compare e1 e2 with Some c -> true | None -> false) ->
		let c = match is_special_compare e1 e2 with Some c -> c | None -> assert false in
		gen_expr ctx (mk (TCall (mk (TField (mk (TTypeExpr (TClassDecl c)) t_dynamic e.epos,FDynamic "compare")) t_dynamic e.epos,[e1;e2])) ctx.inf.com.basic.tbool e.epos);
	(* what is this used for? *)
(* 	| TBinop (op,{ eexpr = TField (e1,s) },e2) ->
		gen_value_op ctx e1;
		gen_field_access ctx e1.etype s;
		print ctx " %s " (Ast.s_binop op);
		gen_value_op ctx e2; *)
	(* assignments to variable or dynamic methods fields on interfaces are generated as class["field"] = value *)
	| TBinop (op,{eexpr = TField (ei, FInstance({cl_interface = true},_,{cf_kind = (Method MethDynamic | Var _); cf_name = s}))},e2) ->
		gen_value ctx ei;
		print ctx "[\"%s\"]" s;
		print ctx " %s " (Ast.s_binop op);
		gen_value_op ctx e2;
	| TBinop (op,e1,e2) ->
		gen_value_op ctx e1;
		print ctx " %s " (Ast.s_binop op);
		gen_value_op ctx e2;
	(* variable fields and dynamic methods on interfaces are generated as (class["field"] as class) *)
	| TField (ei, FInstance({cl_interface = true},_,{cf_kind = (Method MethDynamic | Var _); cf_name = s})) ->
		spr ctx "(";
		gen_value ctx ei;
		print ctx "[\"%s\"]" s;
		print ctx " as %s)" (type_str ctx e.etype e.epos);
	| TField({eexpr = TArrayDecl _} as e1,s) ->
		spr ctx "(";
		gen_expr ctx e1;
		spr ctx ")";
		gen_field_access ctx e1.etype (field_name s)
	| TEnumParameter (e,_,i) ->
		gen_value ctx e;
		print ctx ".params[%i]" i;
	| TField (e,s) ->
		gen_value ctx e;
		gen_field_access ctx e.etype (field_name s)
	| TTypeExpr t ->
		spr ctx (s_path ctx true (t_path t) e.epos)
	| TParenthesis e ->
		spr ctx "(";
		gen_value ctx e;
		spr ctx ")";
	| TMeta (_,e) ->
		gen_expr ctx e
	| TReturn eo ->
		if ctx.in_value <> None then unsupported e.epos;
		(match eo with
		| None ->
			spr ctx "return"
		| Some e when (match follow e.etype with TEnum({ e_path = [],"Void" },[]) | TAbstract ({ a_path = [],"Void" },[]) -> true | _ -> false) ->
			print ctx "{";
			let bend = open_block ctx in
			newline ctx;
			gen_value ctx e;
			newline ctx;
			spr ctx "return";
			bend();
			newline ctx;
			print ctx "}";
		| Some e ->
			spr ctx "return ";
			gen_value ctx e);
	| TBreak ->
		if ctx.in_value <> None then unsupported e.epos;
		if ctx.handle_break then spr ctx "throw \"__break__\"" else spr ctx "break"
	| TContinue ->
		if ctx.in_value <> None then unsupported e.epos;
		spr ctx "continue"
	| TBlock el ->
		print ctx "{";
		let bend = open_block ctx in
		let cb = (if not ctx.constructor_block then
			(fun () -> ())
		else if not (Codegen.constructor_side_effects e) then begin
			ctx.constructor_block <- false;
			(fun () -> ())
		end else begin
			ctx.constructor_block <- false;
			print ctx " if( !%s.skip_constructor ) {" (s_path ctx true (["flash"],"Boot") e.epos);
			(fun() -> print ctx "}")
		end) in
		(match ctx.block_inits with None -> () | Some i -> i());
		List.iter (fun e -> gen_block_element ctx e) el;
		bend();
		newline ctx;
		cb();
		print ctx "}";
	| TFunction f ->
		let h = gen_function_header ctx None f [] e.epos in
		let old = ctx.in_static in
		ctx.in_static <- true;
		gen_expr ctx f.tf_expr;
		ctx.in_static <- old;
		h();
	| TCall (v,el) ->
		gen_call ctx v el e.etype
	| TArrayDecl el ->
		spr ctx "[";
		concat ctx "," (gen_value ctx) el;
		spr ctx "]"
	| TThrow e ->
		spr ctx "throw ";
		gen_value ctx e;
	| TVar (v,eo) ->
		spr ctx "var ";
		print ctx "%s : %s" (s_ident v.v_name) (type_str ctx v.v_type e.epos);
		begin match eo with
		| None -> ()
		| Some e ->
			spr ctx " = ";
			gen_value ctx e
		end
	| TNew (c,params,el) ->
		(match c.cl_path, params with
		| (["flash"],"Vector"), [pt] -> print ctx "new Vector.<%s>(" (type_str ctx pt e.epos)
		| _ -> print ctx "new %s(" (s_path ctx true c.cl_path e.epos));
		concat ctx "," (gen_value ctx) el;
		spr ctx ")"
	| TIf (cond,e,eelse) ->
		spr ctx "if";
		gen_value ctx (parent cond);
		spr ctx " ";
		gen_expr ctx e;
		(match eelse with
		| None -> ()
		| Some e ->
			newline ctx;
			spr ctx "else ";
			gen_expr ctx e);
	| TUnop (op,Ast.Prefix,e) ->
		spr ctx (Ast.s_unop op);
		gen_value ctx e
	| TUnop (op,Ast.Postfix,e) ->
		gen_value ctx e;
		spr ctx (Ast.s_unop op)
	| TWhile (cond,e,Ast.NormalWhile) ->
		let handle_break = handle_break ctx e in
		spr ctx "while";
		gen_value ctx (parent cond);
		spr ctx " ";
		gen_expr ctx e;
		handle_break();
	| TWhile (cond,e,Ast.DoWhile) ->
		let handle_break = handle_break ctx e in
		spr ctx "do ";
		gen_expr ctx e;
		spr ctx " while";
		gen_value ctx (parent cond);
		handle_break();
	| TObjectDecl fields ->
		spr ctx "{ ";
		concat ctx ", " (fun (f,e) -> print ctx "%s : " (anon_field f); gen_value ctx e) fields;
		spr ctx "}"
	| TFor (v,it,e) ->
		let handle_break = handle_break ctx e in
		let tmp = gen_local ctx "$it" in
		print ctx "{ var %s : * = " tmp;
		gen_value ctx it;
		newline ctx;
		print ctx "while( %s.hasNext() ) { var %s : %s = %s.next()" tmp (s_ident v.v_name) (type_str ctx v.v_type e.epos) tmp;
		newline ctx;
		gen_expr ctx e;
		newline ctx;
		spr ctx "}}";
		handle_break();
	| TTry (e,catchs) ->
		spr ctx "try ";
		gen_expr ctx e;
		List.iter (fun (v,e) ->
			newline ctx;
			print ctx "catch( %s : %s )" (s_ident v.v_name) (type_str ctx v.v_type e.epos);
			gen_expr ctx e;
		) catchs;
	| TSwitch (e,cases,def) ->
		spr ctx "switch";
		gen_value ctx (parent e);
		spr ctx " {";
		newline ctx;
		List.iter (fun (el,e2) ->
			List.iter (fun e ->
				spr ctx "case ";
				gen_value ctx e;
				spr ctx ":";
			) el;
			gen_block ctx e2;
			print ctx "break";
			newline ctx;
		) cases;
		(match def with
		| None -> ()
		| Some e ->
			spr ctx "default:";
			gen_block ctx e;
			print ctx "break";
			newline ctx;
		);
		spr ctx "}"
	| TCast (e1,None) ->
		let s = type_str ctx e.etype e.epos in
		if s = "*" then
			gen_expr ctx e1
		else begin
			spr ctx "((";
			gen_value ctx e1;
			print ctx ") as %s)" s
		end
	| TCast (e1,Some t) ->
		gen_expr ctx (Codegen.default_cast ctx.inf.com e1 t e.etype e.epos)

and gen_block_element ctx e = match e.eexpr with
	| TObjectDecl fl ->
		List.iter (fun (_,e) -> gen_block_element ctx e) fl
	| _ ->
		block_newline ctx;
		gen_expr ctx e

and gen_block ctx e =
	newline ctx;
	match e.eexpr with
	| TBlock [] -> ()
	| _ ->
		gen_expr ctx e;
		newline ctx

and gen_value ctx e =
	let assign e =
		mk (TBinop (Ast.OpAssign,
			mk (TLocal (match ctx.in_value with None -> assert false | Some r -> r)) t_dynamic e.epos,
			e
		)) e.etype e.epos
	in
	let block e =
		mk (TBlock [e]) e.etype e.epos
	in
	let value block =
		let old = ctx.in_value in
		let t = type_str ctx e.etype e.epos in
		let r = alloc_var (gen_local ctx "$r") e.etype in
		ctx.in_value <- Some r;
		if ctx.in_static then
			print ctx "function() : %s " t
		else
			print ctx "(function($this:%s) : %s " (snd ctx.path) t;
		let b = if block then begin
			spr ctx "{";
			let b = open_block ctx in
			newline ctx;
			print ctx "var %s : %s" r.v_name t;
			newline ctx;
			b
		end else
			(fun() -> ())
		in
		(fun() ->
			if block then begin
				newline ctx;
				print ctx "return %s" r.v_name;
				b();
				newline ctx;
				spr ctx "}";
			end;
			ctx.in_value <- old;
			if ctx.in_static then
				print ctx "()"
			else
				print ctx "(%s))" (this ctx)
		)
	in
	match e.eexpr with
	| TCall ({ eexpr = TLocal { v_name = "__keys__" } },_) | TCall ({ eexpr = TLocal { v_name = "__hkeys__" } },_) ->
		let v = value true in
		gen_expr ctx e;
		v()
	| TConst _
	| TLocal _
	| TArray _
	| TBinop _
	| TField _
	| TEnumParameter _
	| TTypeExpr _
	| TParenthesis _
	| TObjectDecl _
	| TArrayDecl _
	| TCall _
	| TNew _
	| TUnop _
	| TFunction _ ->
		gen_expr ctx e
	| TMeta (_,e1) ->
		gen_value ctx e1
	| TCast (e1,None) ->
		let s = type_str ctx e.etype e1.epos in
		begin match s with
		| "*" ->
			gen_value ctx e1
		| "Function" | "Array" | "String" ->
			spr ctx "((";
			gen_value ctx e1;
			print ctx ") as %s)" s;
		| _ ->
			print ctx "%s(" s;
			gen_value ctx e1;
			spr ctx ")";
		end
	| TCast (e1,Some t) ->
		gen_value ctx (Codegen.default_cast ctx.inf.com e1 t e.etype e.epos)
	| TReturn _
	| TBreak
	| TContinue ->
		unsupported e.epos
	| TVar _
	| TFor _
	| TWhile _
	| TThrow _ ->
		(* value is discarded anyway *)
		let v = value true in
		gen_expr ctx e;
		v()
	| TBlock [] ->
		spr ctx "null"
	| TBlock [e] ->
		gen_value ctx e
	| TBlock el ->
		let v = value true in
		let rec loop = function
			| [] ->
				spr ctx "return null";
			| [e] ->
				gen_expr ctx (assign e);
			| e :: l ->
				gen_expr ctx e;
				newline ctx;
				loop l
		in
		loop el;
		v();
	| TIf (cond,e,eo) ->
		spr ctx "(";
		gen_value ctx cond;
		spr ctx "?";
		gen_value ctx e;
		spr ctx ":";
		(match eo with
		| None -> spr ctx "null"
		| Some e -> gen_value ctx e);
		spr ctx ")"
	| TSwitch (cond,cases,def) ->
		let v = value true in
		gen_expr ctx (mk (TSwitch (cond,
			List.map (fun (e1,e2) -> (e1,assign e2)) cases,
			match def with None -> None | Some e -> Some (assign e)
		)) e.etype e.epos);
		v()
	| TTry (b,catchs) ->
		let v = value true in
		gen_expr ctx (mk (TTry (block (assign b),
			List.map (fun (v,e) -> v, block (assign e)) catchs
		)) e.etype e.epos);
		v()

let final m =
	if Ast.Meta.has Ast.Meta.Final m then " final " else ""

let generate_field ctx static f =
	newline ctx;
	ctx.in_static <- static;
	ctx.gen_uid <- 0;
	List.iter (fun(m,pl,_) ->
		match m,pl with
		| Ast.Meta.Meta, [Ast.ECall ((Ast.EConst (Ast.Ident n),_),args),_] ->
			let mk_arg (a,p) =
				match a with
				| Ast.EConst (Ast.String s) -> (None, s)
				| Ast.EBinop (Ast.OpAssign,(Ast.EConst (Ast.Ident n),_),(Ast.EConst (Ast.String s),_)) -> (Some n, s)
				| _ -> error "Invalid meta definition" p
			in
			print ctx "[%s" n;
			(match args with
			| [] -> ()
			| _ ->
				print ctx "(";
				concat ctx "," (fun a ->
					match mk_arg a with
					| None, s -> gen_constant ctx (snd a) (TString s)
					| Some s, e -> print ctx "%s=" s; gen_constant ctx (snd a) (TString e)
				) args;
				print ctx ")");
			print ctx "]";
		| _ -> ()
	) f.cf_meta;
	let public = f.cf_public || Hashtbl.mem ctx.get_sets (f.cf_name,static) || (f.cf_name = "main" && static)
		|| f.cf_name = "resolve" || Ast.Meta.has Ast.Meta.Public f.cf_meta
		(* consider all abstract methods public to avoid issues with inlined private access *)
	    || (match ctx.curclass.cl_kind with KAbstractImpl _ -> true | _ -> false)
	in
	let rights = (if static then "static " else "") ^ (if public then "public" else "protected") in
	let p = ctx.curclass.cl_pos in
	match f.cf_expr, f.cf_kind with
	| Some { eexpr = TFunction fd }, Method (MethNormal | MethInline) ->
		print ctx "%s%s " rights (if static then "" else final f.cf_meta);
		let rec loop c =
			match c.cl_super with
			| None -> ()
			| Some (c,_) ->
				if PMap.mem f.cf_name c.cl_fields then
					spr ctx "override "
				else
					loop c
		in
		if not static then loop ctx.curclass;
		let h = gen_function_header ctx (Some (s_ident f.cf_name, f.cf_meta)) fd f.cf_params p in
		gen_expr ctx fd.tf_expr;
		h();
		newline ctx
	| _ ->
		let is_getset = (match f.cf_kind with Var { v_read = AccCall } | Var { v_write = AccCall } -> true | _ -> false) in
		if ctx.curclass.cl_interface then
			match follow f.cf_type with
			| TFun (args,r) when (match f.cf_kind with Method MethDynamic | Var _ -> false | _ -> true) ->
				let rec loop = function
					| [] -> f.cf_name
					| (Ast.Meta.Getter,[Ast.EConst (Ast.String name),_],_) :: _ -> "get " ^ name
					| (Ast.Meta.Setter,[Ast.EConst (Ast.String name),_],_) :: _ -> "set " ^ name
					| _ :: l -> loop l
				in
				print ctx "function %s(" (loop f.cf_meta);
				concat ctx "," (fun (arg,o,t) ->
					let tstr = type_str ctx t p in
					print ctx "%s : %s" arg tstr;
					if o then print ctx " = %s" (default_value tstr);
				) args;
				print ctx ") : %s " (type_str ctx r p);
			| _ -> ()
		else
		let gen_init () = match f.cf_expr with
			| None -> ()
			| Some e ->
				if not static || (match e.eexpr with | TConst _ | TFunction _ | TTypeExpr _ -> true | _ -> false) then begin
					print ctx " = ";
					gen_value ctx e
				end else
					Codegen.ExtClass.add_static_init ctx.curclass f e e.epos
		in
		if is_getset then begin
			let t = type_str ctx f.cf_type p in
			let id = s_ident f.cf_name in
			let v = (match f.cf_kind with Var v -> v | _ -> assert false) in
 			(match v.v_read with
			| AccNormal | AccNo | AccNever ->
				print ctx "%s function get %s() : %s { return $%s; }" rights id t id;
				newline ctx
			| AccCall ->
				print ctx "%s function get %s() : %s { return %s(); }" rights id t ("get_" ^ f.cf_name);
				newline ctx
			| _ -> ());
			(match v.v_write with
			| AccNormal | AccNo | AccNever ->
				print ctx "%s function set %s( __v : %s ) : void { $%s = __v; }" rights id t id;
				newline ctx
			| AccCall ->
				print ctx "%s function set %s( __v : %s ) : void { %s(__v); }" rights id t ("set_" ^ f.cf_name);
				newline ctx
			| _ -> ());
			print ctx "%sprotected var $%s : %s" (if static then "static " else "") (s_ident f.cf_name) (type_str ctx f.cf_type p);
			gen_init()
		end else begin
			print ctx "%s var %s : %s" rights (s_ident f.cf_name) (type_str ctx f.cf_type p);
			gen_init()
		end

let rec define_getset ctx stat c =
	let def f name =
		Hashtbl.add ctx.get_sets (name,stat) f.cf_name
	in
	let field f =
		match f.cf_kind with
		| Method _ -> ()
		| Var v ->
			(match v.v_read with AccCall -> def f ("get_" ^ f.cf_name) | _ -> ());
			(match v.v_write with AccCall -> def f ("set_" ^ f.cf_name) | _ -> ())
	in
	List.iter field (if stat then c.cl_ordered_statics else c.cl_ordered_fields);
	match c.cl_super with
	| Some (c,_) when not stat -> define_getset ctx stat c
	| _ -> ()

let generate_class ctx c =
	ctx.curclass <- c;
	define_getset ctx true c;
	define_getset ctx false c;
	ctx.local_types <- List.map snd c.cl_params;
	let pack = open_block ctx in
	print ctx "\tpublic %s%s%s %s " (final c.cl_meta) (match c.cl_dynamic with None -> "" | Some _ -> if c.cl_interface then "" else "dynamic ") (if c.cl_interface then "interface" else "class") (snd c.cl_path);
	(match c.cl_super with
	| None -> ()
	| Some (csup,_) -> print ctx "extends %s " (s_path ctx true csup.cl_path c.cl_pos));
	(match c.cl_implements with
	| [] -> ()
	| l ->
		spr ctx (if c.cl_interface then "extends " else "implements ");
		concat ctx ", " (fun (i,_) -> print ctx "%s" (s_path ctx true i.cl_path c.cl_pos)) l);
	spr ctx "{";
	let cl = open_block ctx in
	(match c.cl_constructor with
	| None -> ()
	| Some f ->
		let f = { f with
			cf_name = snd c.cl_path;
			cf_public = true;
			cf_kind = Method MethNormal;
		} in
		ctx.constructor_block <- true;
		generate_field ctx false f;
	);
	List.iter (generate_field ctx false) c.cl_ordered_fields;
	List.iter (generate_field ctx true) c.cl_ordered_statics;
	let has_init = match c.cl_init with
		| None -> false
		| Some e ->
			newline ctx;
			spr ctx "static static_init function init() : void";
			gen_expr ctx (mk_block e);
			true;
	in
	cl();
	newline ctx;
	print ctx "}";
	pack();
	newline ctx;
	print ctx "}";
	if has_init then begin
		newline ctx;
		spr ctx "namespace static_init";
		newline ctx;
		print ctx "%s.static_init::init()" (s_path ctx true ctx.curclass.cl_path Ast.null_pos);
	end;
	newline ctx;
	if c.cl_interface && Ast.Meta.has (Ast.Meta.Custom ":hasMetadata") c.cl_meta then begin
		(* we have to reference the metadata class in order for it to be compiled *)
		let path = fst c.cl_path,snd c.cl_path ^ "_HxMeta" in
		spr ctx (Ast.s_type_path path);
		newline ctx
	end

let generate_main ctx inits =
	ctx.curclass <- { null_class with cl_path = [],"__main__" };
	let pack = open_block ctx in
	print ctx "\timport flash.Lib";
	newline ctx;
	print ctx "public class __main__ extends %s {" (s_path ctx true (["flash"],"Boot") Ast.null_pos);
	let cl = open_block ctx in
	newline ctx;
	spr ctx "public function __main__() {";
	let fl = open_block ctx in
	newline ctx;
	spr ctx "super()";
	newline ctx;
	spr ctx "flash.Lib.current = this";
	List.iter (fun e -> newline ctx; gen_expr ctx e) inits;
	fl();
	newline ctx;
	print ctx "}";
	cl();
	newline ctx;
	print ctx "}";
	pack();
	newline ctx;
	print ctx "}";
	newline ctx

let generate_enum ctx e =
	ctx.local_types <- List.map snd e.e_params;
	let pack = open_block ctx in
	let ename = snd e.e_path in
	print ctx "\tpublic final class %s extends enum {" ename;
	let cl = open_block ctx in
	newline ctx;
	print ctx "public static const __isenum : Boolean = true";
	newline ctx;
	print ctx "public function %s( t : String, index : int, p : Array = null ) : void { this.tag = t; this.index = index; this.params = p; }" ename;
	PMap.iter (fun _ c ->
		newline ctx;
		match c.ef_type with
		| TFun (args,_) ->
			print ctx "public static function %s(" c.ef_name;
			concat ctx ", " (fun (a,o,t) ->
				print ctx "%s : %s" (s_ident a) (type_str ctx t c.ef_pos);
				if o then spr ctx " = null";
			) args;
			print ctx ") : %s {" ename;
			print ctx " return new %s(\"%s\",%d,[" ename c.ef_name c.ef_index;
			concat ctx "," (fun (a,_,_) -> spr ctx (s_ident a)) args;
			print ctx "]); }";
		| _ ->
			print ctx "public static var %s : %s = new %s(\"%s\",%d)" c.ef_name ename ename c.ef_name c.ef_index;
	) e.e_constrs;
	newline ctx;
	(match Codegen.build_metadata ctx.inf.com (TEnumDecl e) with
	| None -> ()
	| Some e ->
		print ctx "public static var __meta__ : * = ";
		gen_expr ctx e;
		newline ctx);
	print ctx "public static var __constructs__ : Array = [%s];" (String.concat "," (List.map (fun s -> "\"" ^ Ast.s_escape s ^ "\"") e.e_names));
	cl();
	newline ctx;
	print ctx "}";
	pack();
	newline ctx;
	print ctx "}";
	newline ctx

let generate_base_enum ctx =
	let pack = open_block ctx in
	spr ctx "\timport flash.Boot";
	newline ctx;
	spr ctx "public class enum {";
	let cl = open_block ctx in
	newline ctx;
	spr ctx "public var tag : String";
	newline ctx;
	spr ctx "public var index : int";
	newline ctx;
	spr ctx "public var params : Array";
	newline ctx;
	spr ctx "public function toString() : String { return flash.Boot.enum_to_string(this); }";
	cl();
	newline ctx;
	print ctx "}";
	pack();
	newline ctx;
	print ctx "}";
	newline ctx

let generate com =
	let infos = {
		com = com;
	} in
	generate_resources infos;
	let ctx = init infos ([],"enum") in
	generate_base_enum ctx;
	close ctx;
	let inits = ref [] in
	List.iter (fun t ->
		match t with
		| TClassDecl c ->
			let c = (match c.cl_path with
				| ["flash"],"FlashXml__" -> { c with cl_path = [],"Xml" }
				| (pack,name) -> { c with cl_path = (pack,protect name) }
			) in
			if c.cl_extern then
				(match c.cl_init with
				| None -> ()
				| Some e -> inits := e :: !inits)
			else
				let ctx = init infos c.cl_path in
				generate_class ctx c;
				close ctx
		| TEnumDecl e ->
			let pack,name = e.e_path in
			let e = { e with e_path = (pack,protect name) } in
			if e.e_extern then
				()
			else
				let ctx = init infos e.e_path in
				generate_enum ctx e;
				close ctx
		| TTypeDecl _ | TAbstractDecl _ ->
			()
	) com.types;
	(match com.main with
	| None -> ()
	| Some e -> inits := e :: !inits);
	let ctx = init infos ([],"__main__") in
	generate_main ctx (List.rev !inits);
	close ctx