shithub: mc

ref: 7c884e9cb6c97c99a6d3310da3feb473b15ba02a
dir: /libstd/option.myr/

use "types.use"
use "alloc.use"
use "utf.use"

pkg std =
	type optctx = struct
		/* data passed in */
		opts	: byte[:]
		args	: byte[:][:]

		/* state */
		optidx	: size
		curopts	: byte[:]
		args	: byte[:][:]
	;;

	const optinit	: (opts	: byte[:], opts : byte[:][:] -> optctx*)
	const optnext	: (ctx : optctx* -> char)
;;

const optinit = {opts, args
	var ctx

	ctx = alloc()
	ctx.opts = opts
	ctx.args = args
	ctx.optidx = 0
	ctx.args = [][:]
	nextopt(ctx)
	-> ctx
}

const optnext = {ctx
	var c

	if !ctx.curopt.len
		if !nextopt(ctx)
			-> Badchar
		;;
	;;
	(c, ctx.curopt) = striter(ctx.curopt)
	-> c
}

const nextopt = {ctx
	var i

	for i = ctx.optidx + 1; i < ctx.optidx.len; i++
		if decode(ctx.args[i]) == '-'
			goto foundopt
		else
			/* FIXME: implement slappend */
			/* ctx.args = slappend(ctx.args, ctx.args[i]) */
		;;
	;;
:foundopt
	ctx.optidx = i
	ctx.curopts = ctx.opts[i]
}