FEAT: aligned interpreter behavior to compiler's one wrt COPY on objects semantics.

COPY will reBIND object's functions to the new object (on contrary to Rebol3). Unfortunately, that is the only option we have for the Red compiler, due to implementation constraints. As methods calls take an object reference as argument internally in Red, the compiler needs to figure out accurately which object the method belongs to. Statically determining if an object has been COPYed or not is impossible in the general case, so the compiler needs to stick to the only reliable semantics it can handle, which is to use the newest object as context for the method calls.

Red/System [
	Title:   "Object! datatype runtime functions"
	Author:  "Nenad Rakocevic"
	File: 	 %object.reds
	Tabs:	 4
	Rights:  "Copyright (C) 2011-2013 Nenad Rakocevic. All rights reserved."
	License: {
		Distributed under the Boost Software License, Version 1.0.
		See https://github.com/dockimbel/Red/blob/master/BSL-License.txt
	}
]

object: context [
	verbose: 0

	class-id: 1'000'000									;-- base ID for dynamically created objects

	get-new-id: func [return: [integer!]][				;@@ protect from concurrent accesses
		class-id: class-id + 1
		class-id
	]

	save-self-object: func [
		obj		[red-object!]
		return: [node!]
		/local
			int	 [red-integer!]
			node [node!]
			s	 [series!]
	][
		node: alloc-cells 1								;-- hidden object value storage used by SELF
		s: as series! node/value
		copy-cell as red-value! obj s/offset
		node
	]

	make-callback-node: func [
		ctx		[red-context!]
		index   [integer!]
		locals  [integer!]
		return: [node!]
		/local
			node [node!]
			int  [red-integer!]
			s	 [series!]
	][
		node: alloc-cells 2
		s: as series! node/value
		int: as red-integer! s/offset
		int/header: TYPE_INTEGER
		int/value: index

		int: as red-integer! s/offset + 1
		int/header: TYPE_INTEGER
		s: as series! ctx/values/value
		int/value: locals
		node
	]

	on-set-defined?: func [
		ctx		[red-context!]
		return: [node!]
		/local
			word   [red-word!]
			tail   [red-word!]
			fun	   [red-function!]
			s	   [series!]
			on-set [integer!]
			index  [integer!]
	][
		s:		as series! ctx/symbols/value
		word:	as red-word! s/offset
		tail:	as red-word! s/tail
		on-set:	words/_on-word-set*/symbol
		index:	-1

		while [all [index < 0 word < tail]][
			if on-set = symbol/resolve word/symbol [
				index: (as-integer tail - word) >> 4 + 1  ;-- index is 1-based
			]
			word: word + 1
		]
		if index = -1 [return null]						;-- callback is not found

		s: as series! ctx/values/value
		fun: as red-function! s/offset + index

		make-callback-node
			ctx
			index
			_function/calc-arity null fun 0				;-- passing a null path triggers short code branch
	]

	fire-on-set*: func [								;-- compiled code entry point
		parent [red-word!]
		field  [red-word!]
	][
		fire-on-set
			as red-object! _context/get parent
			field
			stack/top - 1
			stack/top - 2
	]

	fire-on-set: func [
		obj	 [red-object!]
		word [red-word!]
		old	 [red-value!]
		new	 [red-value!]
		/local
			fun	  [red-function!]
			int	  [red-integer!]
			index [integer!]
			count [integer!]
			s	  [series!]
	][
		#if debug? = yes [if verbose > 0 [print-line "object/fire-on-set"]]

		assert TYPE_OF(obj) = TYPE_OBJECT
		assert obj/on-set <> null
		s: as series! obj/on-set/value

		int: as red-integer! s/offset
		assert TYPE_OF(int) = TYPE_INTEGER
		index: int/value

		int: as red-integer! s/offset + 1
		assert TYPE_OF(int) = TYPE_INTEGER
		count: int/value

		ctx: GET_CTX(obj)
		s: as series! ctx/values/value
		fun: as red-function! s/offset + index
		assert TYPE_OF(fun) = TYPE_FUNCTION

		stack/mark-func words/_on-word-set*
		stack/push as red-value! word
		stack/push old
		stack/push new
		if positive? count [_function/init-locals count]
		_function/call fun obj/ctx
		stack/unwind
	]

	unchanged?: func [
		word	[red-word!]
		id		[integer!]
		return: [logic!]
		/local
			obj [red-object!]
	][
		obj: as red-object! _context/get word
		all [
			TYPE_OF(obj) = TYPE_OBJECT
			obj/class = id
		]
	]

	unchanged2?: func [
		node	[node!]
		index	[integer!]
		id		[integer!]
		return: [logic!]
		/local
			obj	   [red-object!]
			ctx	   [red-context!]
			values [series!]
	][
		ctx: TO_CTX(node)
		values: as series! ctx/values/value
		obj: as red-object! values/offset + index
		all [
			TYPE_OF(obj) = TYPE_OBJECT
			obj/class = id
		]
	]

	do-indent: func [
		buffer	[red-string!]
		tabs	[integer!]
		part	[integer!]
		return:	[integer!]
		/local
			n [integer!]
	][
		n: tabs
		until [
			string/concatenate-literal buffer "    "
			n: n - 1
			zero? n
		]
		part - (4 * tabs)
	]

	serialize: func [
		obj		[red-object!]
		buffer	[red-string!]
		only?	[logic!]
		all?	[logic!]
		flat?	[logic!]
		arg		[red-value!]
		part	[integer!]
		indent?	[logic!]
		tabs	[integer!]
		return: [integer!]
		/local
			ctx		[red-context!]
			syms	[series!]
			values	[series!]
			sym		[red-value!]
			s-tail	[red-value!]
			value	[red-value!]
			blank	[byte!]
	][
		ctx: 	GET_CTX(obj)
		syms:   as series! ctx/symbols/value
		values: as series! ctx/values/value

		sym:	syms/offset
		s-tail: syms/tail
		value: 	values/offset

		if sym = s-tail [return part]					;-- exit if empty

		either flat? [
			indent?: no
			blank: space
		][
			string/append-char GET_BUFFER(buffer) as-integer lf
			part: part - 1
			blank: lf
		]

		while [sym < s-tail][
			if indent? [part: do-indent buffer tabs part]

			part: word/mold as red-word! sym buffer no no flat? arg part tabs
			string/concatenate-literal buffer ": "
			part: part - 2

			if TYPE_OF(value) = TYPE_VALUE [value/header: TYPE_UNSET] ;-- force uninitialized slot to UNSET
			part: actions/mold value buffer only? all? flat? arg part tabs

			if any [indent? sym + 1 < s-tail][			;-- no final LF when FORMed
				string/append-char GET_BUFFER(buffer) as-integer blank
				part: part - 1
			]
			sym: sym + 1
			value: value + 1
		]
		part
	]

	transfer: func [
		src    [node!]									;-- src context
		dst	   [node!]									;-- dst context (extension of src)
		/local
			from   [red-context!]
			to	   [red-context!]
			word   [red-word!]
			symbol [red-value!]
			value  [red-value!]
			tail   [red-value!]
			target [red-value!]
			s	   [series!]
			idx	   [integer!]
			type   [integer!]
	][
		from: TO_CTX(src)
		to:	  TO_CTX(dst)

		s: as series! from/symbols/value
		symbol: s/offset
		tail: s/tail

		s: as series! from/values/value
		value: s/offset

		s: as series! to/values/value
		target: s/offset

		while [symbol < tail][
			word: as red-word! symbol
			idx: _context/find-word to word/symbol no

			type: TYPE_OF(value)
			either ANY_SERIES?(type) [					;-- copy series value in extended object
				actions/copy
					as red-series! value
					target + idx
					null
					yes
					null
			][
				copy-cell value target + idx			;-- just propagate the old value by default
			]
			symbol: symbol + 1
			value: value + 1
		]
	]

	duplicate: func [
		src    [node!]									;-- src context
		dst	   [node!]									;-- dst context (extension of src)
		/local
			from   [red-context!]
			to	   [red-context!]
			value  [red-value!]
			tail   [red-value!]
			target [red-value!]
			s	   [series!]
			type   [integer!]
	][
		from: TO_CTX(src)
		to:	  TO_CTX(dst)

		s: as series! from/values/value
		value: s/offset
		tail:  s/tail

		s: as series! to/values/value
		target: s/offset

		while [value < tail][
			type: TYPE_OF(value)
			either ANY_SERIES?(type) [					;-- copy series value in extended object
				actions/copy
					as red-series! value
					target
					null
					yes
					null
			][
				copy-cell value target					;-- just propagate the old value by default
			]
			value: value + 1
			target: target + 1
		]
	]

	extend: func [
		ctx		[red-context!]
		spec	[red-context!]
		return: [logic!]
		/local
			syms  [red-value!]
			tail  [red-value!]
			vals  [red-value!]
			value [red-value!]
			base  [red-value!]
			word  [red-word!]
			type  [integer!]
			s	  [series!]
	][
		s: as series! spec/symbols/value
		syms: s/offset
		tail: s/tail

		s: as series! spec/values/value
		vals: s/offset

		s: as series! ctx/symbols/value
		base: s/tail - s/offset

		s: as series! ctx/values/value

		while [syms < tail][
			value: _context/add-with ctx as red-word! syms vals

			if null? value [
				word: as red-word! syms
				value: s/offset + _context/find-word ctx word/symbol no
				copy-cell vals value
			]
			type: TYPE_OF(value)
			case [
				ANY_SERIES?(type) [
					actions/copy
						as red-series! value
						value						;-- overwrite the value
						null
						yes
						null
				]
				type = TYPE_FUNCTION [
					rebind as red-function! value ctx
				]
				true [0]
			]
			syms: syms + 1
			vals: vals + 1
		]
		s: as series! ctx/symbols/value					;-- refreshing pointer
		s/tail - s/offset > base						;-- TRUE: new words added
	]

	rebind: func [
		fun		[red-function!]
		ctx 	[red-context!]
		/local
			s	 [series!]
			more [red-value!]
			blk  [red-block!]
			spec [red-block!]
	][
		s: as series! fun/more/value
		more: s/offset

		if TYPE_OF(more) = TYPE_NONE [
			print-line "*** Error: rebinding stuck on missing function's body block"
			halt
		]
		spec: as red-block! stack/push*
		spec/head: 0
		spec/node: fun/spec

		blk: block/clone as red-block! more yes
		_context/bind blk ctx null yes					;-- rebind new body to object
		_function/push spec blk	fun/ctx null null		;-- recreate function
		copy-cell stack/top - 1	as red-value! fun		;-- overwrite function slot in object
		stack/pop 2										;-- remove extra stack slots (block/clone and _function/push)

		s: as series! fun/more/value
		more: s/offset + 2
		more/header: TYPE_UNSET							;-- invalidate compiled body
	]

	init-push: func [
		node	[node!]
		class	[integer!]
		return: [red-object!]
		/local
			ctx [red-context!]
			obj	[red-object!]
	][
		ctx: TO_CTX(node)
		s: as series! ctx/values/value
		if s/offset = s/tail [
			s/tail: s/offset + (s/size >> 4)			;-- (late) setting of 'values right tail pointer
		]

		obj: as red-object! stack/push*
		obj/header: TYPE_OBJECT
		obj/ctx:	node
		obj/class:	class
		obj/on-set: null								;-- deferred setting, once object's body is evaluated
		obj
	]

	init-on-set: func [
		ctx	   [node!]
		index  [integer!]
		locals [integer!]
		/local
			obj  [red-object!]
			word [red-word!]
	][
		word: as red-word! stack/top - 1
		assert TYPE_OF(word) = TYPE_WORD
		obj: as red-object! _context/get word
		assert TYPE_OF(obj) = TYPE_OBJECT
		obj/on-set: make-callback-node TO_CTX(ctx) index locals
	]

	push: func [
		ctx		[node!]
		class	[integer!]
		index	[integer!]
		locals	[integer!]
		return: [red-object!]
		/local
			obj	[red-object!]
	][
		obj: as red-object! stack/push*
		obj/header: TYPE_OBJECT
		obj/ctx:	ctx
		obj/class:	class
		obj/on-set: make-callback-node TO_CTX(ctx) index locals
		obj
	]

	make-at: func [
		obj		[red-object!]
		slots	[integer!]
		return: [red-object!]
	][
		obj/header: TYPE_OBJECT
		obj/ctx:	_context/create slots no yes
		obj/class:	0
		obj/on-set: null
		obj
	]

	;-- Actions --

	make: func [
		proto	[red-object!]
		spec	[red-value!]
		return:	[red-object!]
		/local
			obj	 [red-object!]
			obj2 [red-object!]
			ctx	 [red-context!]
			blk	 [red-block!]
	][
		#if debug? = yes [if verbose > 0 [print-line "object/make"]]

		obj: as red-object! stack/push*

		either TYPE_OF(proto) = TYPE_OBJECT [
			copy proto obj null yes null				;-- /deep
		][
			make-at obj 4								;-- arbitrary value
		]
		ctx: GET_CTX(obj)

		switch TYPE_OF(spec) [
			TYPE_OBJECT [
				obj2: as red-object! spec
				obj/class: either extend ctx GET_CTX(obj2) [get-new-id][proto/class]
			]
			TYPE_BLOCK [
				blk: as red-block! spec
				_context/collect-set-words ctx blk
				_context/bind blk ctx save-self-object obj yes
				interpreter/eval blk no
				obj/class: get-new-id
				obj/on-set: on-set-defined? ctx
			]
			default [
				print-line "*** Error: invalid spec value for object construction"
				halt
			]
		]
		obj
	]

	reflect: func [
		obj		[red-object!]
		field	[integer!]
		return:	[red-block!]
		/local
			ctx	  [red-context!]
			blk   [red-block!]
			syms  [red-value!]
			vals  [red-value!]
			tail  [red-value!]
			value [red-value!]
			s	  [series!]
	][
		blk: 		as red-block! stack/push*
		blk/header: TYPE_BLOCK
		blk/head: 	0

		ctx: GET_CTX(obj)

		case [
			field = words/words [
				blk/node: ctx/symbols
				blk: block/clone blk no
			]
			field = words/values [
				blk/node: ctx/values
				blk: block/clone blk no
			]
			field = words/body [
				blk/node: ctx/symbols
				blk/node: alloc-cells block/rs-length? blk

				s: as series! ctx/symbols/value
				syms: s/offset
				tail: s/tail

				s: as series! ctx/values/value
				vals: s/offset

				while [syms < tail][
					value: block/rs-append blk syms
					value/header: TYPE_SET_WORD
					block/rs-append blk vals
					syms: syms + 1
					vals: vals + 1
				]
			]
			true [
				--NOT_IMPLEMENTED--						;@@ raise error
			]
		]
		as red-block! stack/set-last as red-value! blk
	]

	form: func [
		obj		[red-object!]
		buffer	[red-string!]
		arg		[red-value!]
		part	[integer!]
		return: [integer!]
	][
		#if debug? = yes [if verbose > 0 [print-line "object/form"]]

		serialize obj buffer no no no arg part no 0
	]

	mold: func [
		obj		[red-object!]
		buffer	[red-string!]
		only?	[logic!]
		all?	[logic!]
		flat?	[logic!]
		arg		[red-value!]
		part	[integer!]
		indent	[integer!]
		return: [integer!]
	][
		#if debug? = yes [if verbose > 0 [print-line "object/mold"]]

		string/concatenate-literal buffer "make object! ["
		part: serialize obj buffer only? all? flat? arg part - 15 yes indent + 1
		if indent > 0 [part: do-indent buffer indent part]
		string/append-char GET_BUFFER(buffer) as-integer #"]"
		part - 1
	]

	eval-path: func [
		parent	[red-object!]							;-- implicit type casting
		element	[red-value!]
		value	[red-value!]
		return:	[red-value!]
		/local
			word	[red-word!]
			ctx		[red-context!]
			old		[red-value!]
			on-set? [logic!]
	][
		#if debug? = yes [if verbose > 0 [print-line "object/eval-path"]]

		word: as red-word! element
		assert TYPE_OF(word) = TYPE_WORD
		ctx:  GET_CTX(parent)

		if word/ctx <> parent/ctx [						;-- bind the word to object's context
			word/index: _context/find-word ctx word/symbol no
			word/ctx: parent/ctx
		]
		either value <> null [
			on-set?: parent/on-set <> null
			if on-set? [old: stack/push _context/get-in word ctx]
			_context/set-in word value ctx
			if on-set? [fire-on-set parent as red-word! element old value]
			value
		][
			_context/get-in word ctx
		]
	]

	compare: func [
		obj1	[red-object!]							;-- first operand
		obj2	[red-object!]							;-- second operand
		op		[integer!]								;-- type of comparison
		return:	[logic!]
		/local
			ctx1   [red-context!]
			ctx2   [red-context!]
			sym1   [red-word!]
			sym2   [red-word!]
			tail   [red-word!]
			value1 [red-value!]
			value2 [red-value!]
			s	   [series!]
			diff   [integer!]
			s1	   [integer!]
			s2	   [integer!]
			type1  [integer!]
			type2  [integer!]
			res	   [logic!]
	][
		#if debug? = yes [if verbose > 0 [print-line "object/compare"]]

		if TYPE_OF(obj2) <> TYPE_OBJECT [RETURN_COMPARE_OTHER]

		ctx1: GET_CTX(obj1)
		s: as series! ctx1/symbols/value
		sym1: as red-word! s/offset
		tail: as red-word! s/tail

		ctx2: GET_CTX(obj2)
		s: as series! ctx2/symbols/value

		diff: (as-integer s/tail - s/offset) - (as-integer tail - sym1)
		if diff <> 0 [
			switch op [
				COMP_EQUAL
				COMP_STRICT_EQUAL  [res: false]
				COMP_NOT_EQUAL 	   [res: true]
				COMP_LESSER
				COMP_LESSER_EQUAL  [res: diff > 0]
				COMP_GREATER
				COMP_GREATER_EQUAL [res: diff < 0]
			]
			return res
		]
		if zero? (as-integer tail - sym1) [			;-- empty objects case
			switch op [
				COMP_EQUAL
				COMP_STRICT_EQUAL
				COMP_LESSER_EQUAL
				COMP_GREATER_EQUAL [res: true]
				COMP_NOT_EQUAL 	   [res: false]
				default 		   [res: false]
			]
			return res
		]

		sym2: as red-word! s/offset
		s: as series! ctx1/values/value
		value1: s/offset
		s: as series! ctx2/values/value
		value2: s/offset

		until [
			s1: symbol/resolve sym1/symbol
			s2: symbol/resolve sym2/symbol
			if s1 <> s2 [
				switch op [
					COMP_EQUAL
					COMP_STRICT_EQUAL  [res: false]
					COMP_NOT_EQUAL 	   [res: true]
					COMP_LESSER
					COMP_LESSER_EQUAL  [res: s1 < s2]
					COMP_GREATER
					COMP_GREATER_EQUAL [res: s1 > s2]
				]
				return res
			]
			type1: TYPE_OF(value1)
			type2: TYPE_OF(value2)
			either any [
				type1 = type2
				all [word/any-word? type1 word/any-word? type2]
				all [type1 = TYPE_INTEGER type2 = TYPE_INTEGER]	 ;@@ replace by ANY_NUMBER?
			][
				res: actions/compare value1 value2 op
				sym1: sym1 + 1
				sym2: sym2 + 2
				value1: value1 + 1
				value2: value2 + 1
			][
				switch op [
					COMP_EQUAL
					COMP_STRICT_EQUAL	[res: false]
					COMP_NOT_EQUAL 		[res: true]
					COMP_LESSER_EQUAL	[res: type1 <= type2]
					COMP_GREATER_EQUAL	[res: type1 >= type2]
				]
				return res
			]
			any [
				not res
				sym1 >= tail
			]
		]
		res
	]

	copy: func [
		obj      [red-object!]
		new	  	 [red-object!]
		part-arg [red-value!]
		deep?	 [logic!]
		types	 [red-value!]
		return:	 [red-object!]
		/local
			ctx	  [red-context!]
			nctx  [red-context!]
			value [red-value!]
			tail  [red-value!]
			src	  [series!]
			dst	  [series!]
			size  [integer!]
			slots [integer!]
			type  [integer!]
	][
		#if debug? = yes [if verbose > 0 [print-line "object/copy"]]

		if OPTION?(types) [--NOT_IMPLEMENTED--]

		if OPTION?(part-arg) [
			print-line "***Error: copy/part is not supported on objects"
			halt
		]

		ctx:	GET_CTX(obj)
		src:	as series! ctx/symbols/value
		size:   as-integer src/tail - src/offset
		slots:	size >> 4

		new: make-at new slots
		new/class: obj/class
		nctx: GET_CTX(new)

		;-- process SYMBOLS
		dst: as series! nctx/symbols/value
		copy-memory as byte-ptr! dst/offset as byte-ptr! src/offset size
		dst/size: size
		dst/tail: dst/offset + slots
		_context/set-context-each dst new/ctx

		;-- process VALUES
		src: as series! ctx/values/value
		dst: as series! nctx/values/value
		copy-memory as byte-ptr! dst/offset as byte-ptr! src/offset size
		dst/size: size
		dst/tail: dst/offset + slots

		value: dst/offset
		tail:  dst/tail

		either deep? [
			while [value < tail][
				type: TYPE_OF(value)
				case [
					ANY_SERIES?(type) [
						actions/copy
							as red-series! value
							value						;-- overwrite the value
							null
							yes
							null
					]
					type = TYPE_FUNCTION [
						rebind as red-function! value nctx
					]
					true [0]
				]
				value: value + 1
			]
		][
			while [value < tail][
				if TYPE_OF(value) = TYPE_FUNCTION [
					rebind as red-function! value nctx
				]
				value: value + 1
			]
		]
		new
	]

	find: func [
		obj		 [red-object!]
		value	 [red-value!]
		part	 [red-value!]
		only?	 [logic!]
		case?	 [logic!]
		any?	 [logic!]
		with-arg [red-string!]
		skip	 [red-integer!]
		last?	 [logic!]
		reverse? [logic!]
		tail?	 [logic!]
		match?	 [logic!]
		return:	 [red-value!]
		/local
			word [red-word!]
			ctx	 [node!]
			id	 [integer!]
	][
		#if debug? = yes [if verbose > 0 [print-line "object/find"]]

		assert any [									;@@ replace with ANY_WORD?
			TYPE_OF(value) = TYPE_WORD
			TYPE_OF(value) = TYPE_LIT_WORD
			TYPE_OF(value) = TYPE_GET_WORD
			TYPE_OF(value) = TYPE_SET_WORD
		]
		word: as red-word! value
		ctx: obj/ctx
		id: _context/find-word TO_CTX(ctx) word/symbol yes
		as red-value! either id = -1 [none-value][true-value]
	]

	select: func [
		obj		 [red-object!]
		value	 [red-value!]
		part	 [red-value!]
		only?	 [logic!]
		case?	 [logic!]
		any?	 [logic!]
		with-arg [red-string!]
		skip	 [red-integer!]
		last?	 [logic!]
		reverse? [logic!]
		return:	 [red-value!]
		/local
			word   [red-word!]
			ctx	   [red-context!]
			values [series!]
			node   [node!]
			id	   [integer!]
	][
		#if debug? = yes [if verbose > 0 [print-line "object/select"]]

		assert any [									;@@ replace with ANY_WORD?
			TYPE_OF(value) = TYPE_WORD
			TYPE_OF(value) = TYPE_LIT_WORD
			TYPE_OF(value) = TYPE_GET_WORD
			TYPE_OF(value) = TYPE_SET_WORD
		]
		word: as red-word! value
		node: obj/ctx
		ctx: TO_CTX(node)
		id: _context/find-word ctx word/symbol yes
		if id = -1 [return as red-value! none-value]

		values: as series! ctx/values/value
		values/offset + id
	]

	init: does [
		datatype/register [
			TYPE_OBJECT
			TYPE_VALUE
			"object!"
			;-- General actions --
			:make
			null			;random
			:reflect
			null			;to
			:form
			:mold
			:eval-path
			null			;set-path
			:compare
			;-- Scalar actions --
			null			;absolute
			null			;add
			null			;divide
			null			;multiply
			null			;negate
			null			;power
			null			;remainder
			null			;round
			null			;subtract
			null			;even?
			null			;odd?
			;-- Bitwise actions --
			null			;and~
			null			;complement
			null			;or~
			null			;xor~
			;-- Series actions --
			null			;append
			null			;at
			null			;back
			null			;change
			null			;clear
			:copy
			:find
			null			;head
			null			;head?
			null			;index?
			null			;insert
			null			;length?
			null			;next
			null			;pick
			null			;poke
			null			;remove
			null			;reverse
			:select
			null			;sort
			null			;skip
			null			;swap
			null			;tail
			null			;tail?
			null			;take
			null			;trim
			;-- I/O actions --
			null			;create
			null			;close
			null			;delete
			null			;modify
			null			;open
			null			;open?
			null			;query
			null			;read
			null			;rename
			null			;update
			null			;write
		]
	]
]

Red/System [
	Title:   "Object! datatype runtime functions"
	Author:  "Nenad Rakocevic"
	File: 	 %object.reds
	Tabs:	 4
	Rights:  "Copyright (C) 2011-2013 Nenad Rakocevic. All rights reserved."
	License: {
		Distributed under the Boost Software License, Version 1.0.
		See https://github.com/dockimbel/Red/blob/master/BSL-License.txt
	}
]

object: context [
	verbose: 0

	class-id: 1'000'000									;-- base ID for dynamically created objects

	get-new-id: func [return: [integer!]][				;@@ protect from concurrent accesses
		class-id: class-id + 1
		class-id
	]

	save-self-object: func [
		obj		[red-object!]
		return: [node!]
		/local
			int	 [red-integer!]
			node [node!]
			s	 [series!]
	][
		node: alloc-cells 1								;-- hidden object value storage used by SELF
		s: as series! node/value
		copy-cell as red-value! obj s/offset
		node
	]

	make-callback-node: func [
		ctx		[red-context!]
		index   [integer!]
		locals  [integer!]
		return: [node!]
		/local
			node [node!]
			int  [red-integer!]
			s	 [series!]
	][
		node: alloc-cells 2
		s: as series! node/value
		int: as red-integer! s/offset
		int/header: TYPE_INTEGER
		int/value: index

		int: as red-integer! s/offset + 1
		int/header: TYPE_INTEGER
		s: as series! ctx/values/value
		int/value: locals
		node
	]

	on-set-defined?: func [
		ctx		[red-context!]
		return: [node!]
		/local
			word   [red-word!]
			tail   [red-word!]
			fun	   [red-function!]
			s	   [series!]
			on-set [integer!]
			index  [integer!]
	][
		s:		as series! ctx/symbols/value
		word:	as red-word! s/offset
		tail:	as red-word! s/tail
		on-set:	words/_on-word-set*/symbol
		index:	-1

		while [all [index < 0 word < tail]][
			if on-set = symbol/resolve word/symbol [
				index: (as-integer tail - word) >> 4 + 1  ;-- index is 1-based
			]
			word: word + 1
		]
		if index = -1 [return null]						;-- callback is not found

		s: as series! ctx/values/value
		fun: as red-function! s/offset + index

		make-callback-node
			ctx
			index
			_function/calc-arity null fun 0				;-- passing a null path triggers short code branch
	]

	fire-on-set*: func [								;-- compiled code entry point
		parent [red-word!]
		field  [red-word!]
	][
		fire-on-set
			as red-object! _context/get parent
			field
			stack/top - 1
			stack/top - 2
	]

	fire-on-set: func [
		obj	 [red-object!]
		word [red-word!]
		old	 [red-value!]
		new	 [red-value!]
		/local
			fun	  [red-function!]
			int	  [red-integer!]
			index [integer!]
			count [integer!]
			s	  [series!]
	][
		#if debug? = yes [if verbose > 0 [print-line "object/fire-on-set"]]

		assert TYPE_OF(obj) = TYPE_OBJECT
		assert obj/on-set <> null
		s: as series! obj/on-set/value

		int: as red-integer! s/offset
		assert TYPE_OF(int) = TYPE_INTEGER
		index: int/value

		int: as red-integer! s/offset + 1
		assert TYPE_OF(int) = TYPE_INTEGER
		count: int/value

		ctx: GET_CTX(obj)
		s: as series! ctx/values/value
		fun: as red-function! s/offset + index
		assert TYPE_OF(fun) = TYPE_FUNCTION

		stack/mark-func words/_on-word-set*
		stack/push as red-value! word
		stack/push old
		stack/push new
		if positive? count [_function/init-locals count]
		_function/call fun obj/ctx
		stack/unwind
	]

	unchanged?: func [
		word	[red-word!]
		id		[integer!]
		return: [logic!]
		/local
			obj [red-object!]
	][
		obj: as red-object! _context/get word
		all [
			TYPE_OF(obj) = TYPE_OBJECT
			obj/class = id
		]
	]

	unchanged2?: func [
		node	[node!]
		index	[integer!]
		id		[integer!]
		return: [logic!]
		/local
			obj	   [red-object!]
			ctx	   [red-context!]
			values [series!]
	][
		ctx: TO_CTX(node)
		values: as series! ctx/values/value
		obj: as red-object! values/offset + index
		all [
			TYPE_OF(obj) = TYPE_OBJECT
			obj/class = id
		]
	]

	do-indent: func [
		buffer	[red-string!]
		tabs	[integer!]
		part	[integer!]
		return:	[integer!]
		/local
			n [integer!]
	][
		n: tabs
		until [
			string/concatenate-literal buffer "    "
			n: n - 1
			zero? n
		]
		part - (4 * tabs)
	]

	serialize: func [
		obj		[red-object!]
		buffer	[red-string!]
		only?	[logic!]
		all?	[logic!]
		flat?	[logic!]
		arg		[red-value!]
		part	[integer!]
		indent?	[logic!]
		tabs	[integer!]
		return: [integer!]
		/local
			ctx		[red-context!]
			syms	[series!]
			values	[series!]
			sym		[red-value!]
			s-tail	[red-value!]
			value	[red-value!]
			blank	[byte!]
	][
		ctx: 	GET_CTX(obj)
		syms:   as series! ctx/symbols/value
		values: as series! ctx/values/value

		sym:	syms/offset
		s-tail: syms/tail
		value: 	values/offset

		if sym = s-tail [return part]					;-- exit if empty

		either flat? [
			indent?: no
			blank: space
		][
			string/append-char GET_BUFFER(buffer) as-integer lf
			part: part - 1
			blank: lf
		]

		while [sym < s-tail][
			if indent? [part: do-indent buffer tabs part]

			part: word/mold as red-word! sym buffer no no flat? arg part tabs
			string/concatenate-literal buffer ": "
			part: part - 2

			if TYPE_OF(value) = TYPE_VALUE [value/header: TYPE_UNSET] ;-- force uninitialized slot to UNSET
			part: actions/mold value buffer only? all? flat? arg part tabs

			if any [indent? sym + 1 < s-tail][			;-- no final LF when FORMed
				string/append-char GET_BUFFER(buffer) as-integer blank
				part: part - 1
			]
			sym: sym + 1
			value: value + 1
		]
		part
	]

	transfer: func [
		src    [node!]									;-- src context
		dst	   [node!]									;-- dst context (extension of src)
		/local
			from   [red-context!]
			to	   [red-context!]
			word   [red-word!]
			symbol [red-value!]
			value  [red-value!]
			tail   [red-value!]
			target [red-value!]
			s	   [series!]
			idx	   [integer!]
			type   [integer!]
	][
		from: TO_CTX(src)
		to:	  TO_CTX(dst)

		s: as series! from/symbols/value
		symbol: s/offset
		tail: s/tail

		s: as series! from/values/value
		value: s/offset

		s: as series! to/values/value
		target: s/offset

		while [symbol < tail][
			word: as red-word! symbol
			idx: _context/find-word to word/symbol no

			type: TYPE_OF(value)
			either ANY_SERIES?(type) [					;-- copy series value in extended object
				actions/copy
					as red-series! value
					target + idx
					null
					yes
					null
			][
				copy-cell value target + idx			;-- just propagate the old value by default
			]
			symbol: symbol + 1
			value: value + 1
		]
	]

	duplicate: func [
		src    [node!]									;-- src context
		dst	   [node!]									;-- dst context (extension of src)
		/local
			from   [red-context!]
			to	   [red-context!]
			value  [red-value!]
			tail   [red-value!]
			target [red-value!]
			s	   [series!]
			type   [integer!]
	][
		from: TO_CTX(src)
		to:	  TO_CTX(dst)

		s: as series! from/values/value
		value: s/offset
		tail:  s/tail

		s: as series! to/values/value
		target: s/offset

		while [value < tail][
			type: TYPE_OF(value)
			either ANY_SERIES?(type) [					;-- copy series value in extended object
				actions/copy
					as red-series! value
					target
					null
					yes
					null
			][
				copy-cell value target					;-- just propagate the old value by default
			]
			value: value + 1
			target: target + 1
		]
	]

	extend: func [
		ctx		[red-context!]
		spec	[red-context!]
		return: [logic!]
		/local
			syms  [red-value!]
			tail  [red-value!]
			vals  [red-value!]
			value [red-value!]
			base  [red-value!]
			word  [red-word!]
			type  [integer!]
			s	  [series!]
	][
		s: as series! spec/symbols/value
		syms: s/offset
		tail: s/tail

		s: as series! spec/values/value
		vals: s/offset

		s: as series! ctx/symbols/value
		base: s/tail - s/offset

		s: as series! ctx/values/value

		while [syms < tail][
			value: _context/add-with ctx as red-word! syms vals

			if null? value [
				word: as red-word! syms
				value: s/offset + _context/find-word ctx word/symbol no
				copy-cell vals value
			]
			type: TYPE_OF(value)
			case [
				ANY_SERIES?(type) [
					actions/copy
						as red-series! value
						value						;-- overwrite the value
						null
						yes
						null
				]
				type = TYPE_FUNCTION [
					rebind as red-function! value ctx
				]
				true [0]
			]
			syms: syms + 1
			vals: vals + 1
		]
		s: as series! ctx/symbols/value					;-- refreshing pointer
		s/tail - s/offset > base						;-- TRUE: new words added
	]

	rebind: func [
		fun		[red-function!]
		ctx 	[red-context!]
		/local
			s	 [series!]
			more [red-value!]
			blk  [red-block!]
			spec [red-block!]
	][
		s: as series! fun/more/value
		more: s/offset

		if TYPE_OF(more) = TYPE_NONE [
			print-line "*** Error: rebinding stuck on missing function's body block"
			halt
		]
		spec: as red-block! stack/push*
		spec/head: 0
		spec/node: fun/spec

		blk: block/clone as red-block! more yes
		_context/bind blk ctx null yes					;-- rebind new body to object
		_function/push spec blk	fun/ctx null null		;-- recreate function
		copy-cell stack/top - 1	as red-value! fun		;-- overwrite function slot in object
		stack/pop 2										;-- remove extra stack slots (block/clone and _function/push)

		s: as series! fun/more/value
		more: s/offset + 2
		more/header: TYPE_UNSET							;-- invalidate compiled body
	]

	init-push: func [
		node	[node!]
		class	[integer!]
		return: [red-object!]
		/local
			ctx [red-context!]
			obj	[red-object!]
	][
		ctx: TO_CTX(node)
		s: as series! ctx/values/value
		if s/offset = s/tail [
			s/tail: s/offset + (s/size >> 4)			;-- (late) setting of 'values right tail pointer
		]

		obj: as red-object! stack/push*
		obj/header: TYPE_OBJECT
		obj/ctx:	node
		obj/class:	class
		obj/on-set: null								;-- deferred setting, once object's body is evaluated
		obj
	]

	init-on-set: func [
		ctx	   [node!]
		index  [integer!]
		locals [integer!]
		/local
			obj  [red-object!]
			word [red-word!]
	][
		word: as red-word! stack/top - 1
		assert TYPE_OF(word) = TYPE_WORD
		obj: as red-object! _context/get word
		assert TYPE_OF(obj) = TYPE_OBJECT
		obj/on-set: make-callback-node TO_CTX(ctx) index locals
	]

	push: func [
		ctx		[node!]
		class	[integer!]
		index	[integer!]
		locals	[integer!]
		return: [red-object!]
		/local
			obj	[red-object!]
	][
		obj: as red-object! stack/push*
		obj/header: TYPE_OBJECT
		obj/ctx:	ctx
		obj/class:	class
		obj/on-set: make-callback-node TO_CTX(ctx) index locals
		obj
	]

	make-at: func [
		obj		[red-object!]
		slots	[integer!]
		return: [red-object!]
	][
		obj/header: TYPE_OBJECT
		obj/ctx:	_context/create slots no yes
		obj/class:	0
		obj/on-set: null
		obj
	]

	;-- Actions --

	make: func [
		proto	[red-object!]
		spec	[red-value!]
		return:	[red-object!]
		/local
			obj	 [red-object!]
			obj2 [red-object!]
			ctx	 [red-context!]
			blk	 [red-block!]
	][
		#if debug? = yes [if verbose > 0 [print-line "object/make"]]

		obj: as red-object! stack/push*

		either TYPE_OF(proto) = TYPE_OBJECT [
			copy proto obj null yes null				;-- /deep
		][
			make-at obj 4								;-- arbitrary value
		]
		ctx: GET_CTX(obj)

		switch TYPE_OF(spec) [
			TYPE_OBJECT [
				obj2: as red-object! spec
				obj/class: either extend ctx GET_CTX(obj2) [get-new-id][proto/class]
			]
			TYPE_BLOCK [
				blk: as red-block! spec
				_context/collect-set-words ctx blk
				_context/bind blk ctx save-self-object obj yes
				interpreter/eval blk no
				obj/class: get-new-id
				obj/on-set: on-set-defined? ctx
			]
			default [
				print-line "*** Error: invalid spec value for object construction"
				halt
			]
		]
		obj
	]

	reflect: func [
		obj		[red-object!]
		field	[integer!]
		return:	[red-block!]
		/local
			ctx	  [red-context!]
			blk   [red-block!]
			syms  [red-value!]
			vals  [red-value!]
			tail  [red-value!]
			value [red-value!]
			s	  [series!]
	][
		blk: 		as red-block! stack/push*
		blk/header: TYPE_BLOCK
		blk/head: 	0

		ctx: GET_CTX(obj)

		case [
			field = words/words [
				blk/node: ctx/symbols
				blk: block/clone blk no
			]
			field = words/values [
				blk/node: ctx/values
				blk: block/clone blk no
			]
			field = words/body [
				blk/node: ctx/symbols
				blk/node: alloc-cells block/rs-length? blk

				s: as series! ctx/symbols/value
				syms: s/offset
				tail: s/tail

				s: as series! ctx/values/value
				vals: s/offset

				while [syms < tail][
					value: block/rs-append blk syms
					value/header: TYPE_SET_WORD
					block/rs-append blk vals
					syms: syms + 1
					vals: vals + 1
				]
			]
			true [
				--NOT_IMPLEMENTED--						;@@ raise error
			]
		]
		as red-block! stack/set-last as red-value! blk
	]

	form: func [
		obj		[red-object!]
		buffer	[red-string!]
		arg		[red-value!]
		part	[integer!]
		return: [integer!]
	][
		#if debug? = yes [if verbose > 0 [print-line "object/form"]]

		serialize obj buffer no no no arg part no 0
	]

	mold: func [
		obj		[red-object!]
		buffer	[red-string!]
		only?	[logic!]
		all?	[logic!]
		flat?	[logic!]
		arg		[red-value!]
		part	[integer!]
		indent	[integer!]
		return: [integer!]
	][
		#if debug? = yes [if verbose > 0 [print-line "object/mold"]]

		string/concatenate-literal buffer "make object! ["
		part: serialize obj buffer only? all? flat? arg part - 15 yes indent + 1
		if indent > 0 [part: do-indent buffer indent part]
		string/append-char GET_BUFFER(buffer) as-integer #"]"
		part - 1
	]

	eval-path: func [
		parent	[red-object!]							;-- implicit type casting
		element	[red-value!]
		value	[red-value!]
		return:	[red-value!]
		/local
			word	[red-word!]
			ctx		[red-context!]
			old		[red-value!]
			on-set? [logic!]
	][
		#if debug? = yes [if verbose > 0 [print-line "object/eval-path"]]

		word: as red-word! element
		assert TYPE_OF(word) = TYPE_WORD
		ctx:  GET_CTX(parent)

		if word/ctx <> parent/ctx [						;-- bind the word to object's context
			word/index: _context/find-word ctx word/symbol no
			word/ctx: parent/ctx
		]
		either value <> null [
			on-set?: parent/on-set <> null
			if on-set? [old: stack/push _context/get-in word ctx]
			_context/set-in word value ctx
			if on-set? [fire-on-set parent as red-word! element old value]
			value
		][
			_context/get-in word ctx
		]
	]

	compare: func [
		obj1	[red-object!]							;-- first operand
		obj2	[red-object!]							;-- second operand
		op		[integer!]								;-- type of comparison
		return:	[logic!]
		/local
			ctx1   [red-context!]
			ctx2   [red-context!]
			sym1   [red-word!]
			sym2   [red-word!]
			tail   [red-word!]
			value1 [red-value!]
			value2 [red-value!]
			s	   [series!]
			diff   [integer!]
			s1	   [integer!]
			s2	   [integer!]
			type1  [integer!]
			type2  [integer!]
			res	   [logic!]
	][
		#if debug? = yes [if verbose > 0 [print-line "object/compare"]]

		if TYPE_OF(obj2) <> TYPE_OBJECT [RETURN_COMPARE_OTHER]

		ctx1: GET_CTX(obj1)
		s: as series! ctx1/symbols/value
		sym1: as red-word! s/offset
		tail: as red-word! s/tail

		ctx2: GET_CTX(obj2)
		s: as series! ctx2/symbols/value

		diff: (as-integer s/tail - s/offset) - (as-integer tail - sym1)
		if diff <> 0 [
			switch op [
				COMP_EQUAL
				COMP_STRICT_EQUAL  [res: false]
				COMP_NOT_EQUAL 	   [res: true]
				COMP_LESSER
				COMP_LESSER_EQUAL  [res: diff > 0]
				COMP_GREATER
				COMP_GREATER_EQUAL [res: diff < 0]
			]
			return res
		]
		if zero? (as-integer tail - sym1) [			;-- empty objects case
			switch op [
				COMP_EQUAL
				COMP_STRICT_EQUAL
				COMP_LESSER_EQUAL
				COMP_GREATER_EQUAL [res: true]
				COMP_NOT_EQUAL 	   [res: false]
				default 		   [res: false]
			]
			return res
		]

		sym2: as red-word! s/offset
		s: as series! ctx1/values/value
		value1: s/offset
		s: as series! ctx2/values/value
		value2: s/offset

		until [
			s1: symbol/resolve sym1/symbol
			s2: symbol/resolve sym2/symbol
			if s1 <> s2 [
				switch op [
					COMP_EQUAL
					COMP_STRICT_EQUAL  [res: false]
					COMP_NOT_EQUAL 	   [res: true]
					COMP_LESSER
					COMP_LESSER_EQUAL  [res: s1 < s2]
					COMP_GREATER
					COMP_GREATER_EQUAL [res: s1 > s2]
				]
				return res
			]
			type1: TYPE_OF(value1)
			type2: TYPE_OF(value2)
			either any [
				type1 = type2
				all [word/any-word? type1 word/any-word? type2]
				all [type1 = TYPE_INTEGER type2 = TYPE_INTEGER]	 ;@@ replace by ANY_NUMBER?
			][
				res: actions/compare value1 value2 op
				sym1: sym1 + 1
				sym2: sym2 + 2
				value1: value1 + 1
				value2: value2 + 1
			][
				switch op [
					COMP_EQUAL
					COMP_STRICT_EQUAL	[res: false]
					COMP_NOT_EQUAL 		[res: true]
					COMP_LESSER_EQUAL	[res: type1 <= type2]
					COMP_GREATER_EQUAL	[res: type1 >= type2]
				]
				return res
			]
			any [
				not res
				sym1 >= tail
			]
		]
		res
	]

	copy: func [
		obj      [red-object!]
		new	  	 [red-object!]
		part-arg [red-value!]
		deep?	 [logic!]
		types	 [red-value!]
		return:	 [red-object!]
		/local
			ctx	  [red-context!]
			nctx  [red-context!]
			value [red-value!]
			tail  [red-value!]
			src	  [series!]
			dst	  [series!]
			size  [integer!]
			slots [integer!]
			type  [integer!]
	][
		#if debug? = yes [if verbose > 0 [print-line "object/copy"]]

		if OPTION?(types) [--NOT_IMPLEMENTED--]

		if OPTION?(part-arg) [
			print-line "***Error: copy/part is not supported on objects"
			halt
		]

		ctx:	GET_CTX(obj)
		src:	as series! ctx/symbols/value
		size:   as-integer src/tail - src/offset
		slots:	size >> 4

		new: make-at new slots
		new/class: obj/class
		nctx: GET_CTX(new)

		;-- process SYMBOLS
		dst: as series! nctx/symbols/value
		copy-memory as byte-ptr! dst/offset as byte-ptr! src/offset size
		dst/size: size
		dst/tail: dst/offset + slots
		_context/set-context-each dst new/ctx

		;-- process VALUES
		src: as series! ctx/values/value
		dst: as series! nctx/values/value
		copy-memory as byte-ptr! dst/offset as byte-ptr! src/offset size
		dst/size: size
		dst/tail: dst/offset + slots

		if deep? [
			value: dst/offset
			tail:  dst/tail

			while [value < tail][
				type: TYPE_OF(value)
				case [
					ANY_SERIES?(type) [
						actions/copy
							as red-series! value
							value						;-- overwrite the value
							null
							yes
							null
					]
					type = TYPE_FUNCTION [
						rebind as red-function! value nctx
					]
					true [0]
				]
				value: value + 1
			]
		]

		new
	]

	find: func [
		obj		 [red-object!]
		value	 [red-value!]
		part	 [red-value!]
		only?	 [logic!]
		case?	 [logic!]
		any?	 [logic!]
		with-arg [red-string!]
		skip	 [red-integer!]
		last?	 [logic!]
		reverse? [logic!]
		tail?	 [logic!]
		match?	 [logic!]
		return:	 [red-value!]
		/local
			word [red-word!]
			ctx	 [node!]
			id	 [integer!]
	][
		#if debug? = yes [if verbose > 0 [print-line "object/find"]]

		assert any [									;@@ replace with ANY_WORD?
			TYPE_OF(value) = TYPE_WORD
			TYPE_OF(value) = TYPE_LIT_WORD
			TYPE_OF(value) = TYPE_GET_WORD
			TYPE_OF(value) = TYPE_SET_WORD
		]
		word: as red-word! value
		ctx: obj/ctx
		id: _context/find-word TO_CTX(ctx) word/symbol yes
		as red-value! either id = -1 [none-value][true-value]
	]

	select: func [
		obj		 [red-object!]
		value	 [red-value!]
		part	 [red-value!]
		only?	 [logic!]
		case?	 [logic!]
		any?	 [logic!]
		with-arg [red-string!]
		skip	 [red-integer!]
		last?	 [logic!]
		reverse? [logic!]
		return:	 [red-value!]
		/local
			word   [red-word!]
			ctx	   [red-context!]
			values [series!]
			node   [node!]
			id	   [integer!]
	][
		#if debug? = yes [if verbose > 0 [print-line "object/select"]]

		assert any [									;@@ replace with ANY_WORD?
			TYPE_OF(value) = TYPE_WORD
			TYPE_OF(value) = TYPE_LIT_WORD
			TYPE_OF(value) = TYPE_GET_WORD
			TYPE_OF(value) = TYPE_SET_WORD
		]
		word: as red-word! value
		node: obj/ctx
		ctx: TO_CTX(node)
		id: _context/find-word ctx word/symbol yes
		if id = -1 [return as red-value! none-value]

		values: as series! ctx/values/value
		values/offset + id
	]

	init: does [
		datatype/register [
			TYPE_OBJECT
			TYPE_VALUE
			"object!"
			;-- General actions --
			:make
			null			;random
			:reflect
			null			;to
			:form
			:mold
			:eval-path
			null			;set-path
			:compare
			;-- Scalar actions --
			null			;absolute
			null			;add
			null			;divide
			null			;multiply
			null			;negate
			null			;power
			null			;remainder
			null			;round
			null			;subtract
			null			;even?
			null			;odd?
			;-- Bitwise actions --
			null			;and~
			null			;complement
			null			;or~
			null			;xor~
			;-- Series actions --
			null			;append
			null			;at
			null			;back
			null			;change
			null			;clear
			:copy
			:find
			null			;head
			null			;head?
			null			;index?
			null			;insert
			null			;length?
			null			;next
			null			;pick
			null			;poke
			null			;remove
			null			;reverse
			:select
			null			;sort
			null			;skip
			null			;swap
			null			;tail
			null			;tail?
			null			;take
			null			;trim
			;-- I/O actions --
			null			;create
			null			;close
			null			;delete
			null			;modify
			null			;open
			null			;open?
			null			;query
			null			;read
			null			;rename
			null			;update
			null			;write
		]
	]
]


FIX: non-passing tests on COMPOSE.

FIX: non-passing tests on COMPOSE.

Red/System [
	Title:   "Red native functions"
	Author:  "Nenad Rakocevic"
	File: 	 %natives.reds
	Tabs:	 4
	Rights:  "Copyright (C) 2011-2012 Nenad Rakocevic. All rights reserved."
	License: {
		Distributed under the Boost Software License, Version 1.0.
		See https://github.com/dockimbel/Red/blob/master/BSL-License.txt
	}
]

#define RETURN_NONE [
	stack/reset
	none/push-last
	exit
]

#define RETURN_UNSET [
	stack/reset
	unset/push-last
]

natives: context [
	verbose: 0
	lf?: 	 no											;-- used to print or not an ending newline

	table: as int-ptr! allocate NATIVES_NB * size? integer!
	top: 0

	register: func [
		[variadic]
		count	   [integer!]
		list	   [int-ptr!]
		/local
			offset [integer!]
	][
		offset: 0

		until [
			table/top: list/value
			top: top + 1
			assert top < NATIVES_NB
			list: list + 1
			count: count - 1
			zero? count
		]
	]

	;--- Natives ----

	if*: does [
		either logic/false? [
			RETURN_NONE
		][
			interpreter/eval as red-block! stack/arguments + 1
		]
	]

	unless*: does [
		either logic/false? [
			interpreter/eval as red-block! stack/arguments + 1
		][
			RETURN_NONE
		]
	]

	either*: func [
		/local offset [integer!]
	][
		offset: either logic/true? [1][2]
		interpreter/eval as red-block! stack/arguments + offset
	]

	any*: func [
		/local
			value [red-value!]
			tail  [red-value!]
	][
		value: block/rs-head as red-block! stack/arguments
		tail:  block/rs-tail as red-block! stack/arguments

		while [value < tail][
			value: interpreter/eval-next value tail no
			if logic/true? [exit]
		]
		RETURN_NONE
	]

	all*: func [
		/local
			value [red-value!]
			tail  [red-value!]
	][
		value: block/rs-head as red-block! stack/arguments
		tail:  block/rs-tail as red-block! stack/arguments

		while [value < tail][
			value: interpreter/eval-next value tail no
			if logic/false? [RETURN_NONE]
		]
	]

	while*:	func [
		/local
			cond [red-block!]
			body [red-block!]
	][
		cond: as red-block! stack/arguments
		body: as red-block! stack/arguments + 1

		stack/mark-native words/_body
		while [
			interpreter/eval cond
			logic/true?
		][
			stack/reset
			interpreter/eval body
		]
		stack/unwind
		RETURN_UNSET
	]

	until*: func [
		/local
			body [red-block!]
	][
		body: as red-block! stack/arguments

		stack/mark-native words/_body
		until [
			stack/reset
			interpreter/eval body
			logic/true?
		]
		stack/unwind-last
	]

	loop*: func [
		/local
			body [red-block!]
			i	 [integer!]
	][
		i: integer/get*
		unless positive? i [RETURN_NONE]				;-- if counter <= 0, no loops

		body: as red-block! stack/arguments + 1

		stack/mark-native words/_body
		until [
			stack/reset
			interpreter/eval body
			i: i - 1
			zero? i
		]
		stack/unwind-last
	]

	repeat*: func [
		/local
			w	   [red-word!]
			body   [red-block!]
			count  [red-integer!]
			cnt	   [integer!]
			i	   [integer!]
	][
		w: 	   as red-word!    stack/arguments
		count: as red-integer! stack/arguments + 1
		body:  as red-block!   stack/arguments + 2

		i: integer/get as red-value! count
		unless positive? i [RETURN_NONE]				;-- if counter <= 0, no loops

		count/value: 1

		stack/mark-native words/_body
		until [
			stack/reset
			_context/set w as red-value! count
			interpreter/eval body
			count/value: count/value + 1
			i: i - 1
			zero? i
		]
		stack/unwind-last
	]

	foreach*: func [
		/local
			value [red-value!]
			body  [red-block!]
			size  [integer!]
	][
		value: stack/arguments
		body: as red-block! stack/arguments + 2

		stack/push stack/arguments + 1					;-- copy arguments to stack top in reverse order
		stack/push value								;-- (required by foreach-next)

		stack/mark-native words/_body

		either TYPE_OF(value) = TYPE_BLOCK [
			size: block/rs-length? as red-block! value

			while [foreach-next-block size][			;-- foreach [..]
				stack/reset
				interpreter/eval body
			]
		][
			while [foreach-next][						;-- foreach <word!>
				stack/reset
				interpreter/eval body
			]
		]
		stack/unwind-last
	]

	forall*: func [
		/local
			w 	   [red-word!]
			body   [red-block!]
			saved  [red-value!]
			series [red-series!]
	][
		w:    as red-word!  stack/arguments
		body: as red-block! stack/arguments + 1

		saved: word/get w							;-- save series (for resetting on end)
		w: word/push w								;-- word argument

		stack/mark-native words/_body
		while [
			loop? as red-series! _context/get w
		][
			stack/reset
			interpreter/eval body
			series: as red-series! _context/get w
			series/head: series/head + 1
		]
		stack/unwind-last
		_context/set w saved
	]

	func*:		does []
	function*:	does []
	does*:		does []
	has*:		does []
	exit*:		does []
	return*:	does []

	switch*: func [
		default? [integer!]								;@@ not implemented yet
		/local
			pos	 [red-value!]
			blk  [red-block!]
			end  [red-value!]
			s	 [series!]
	][
		blk: as red-block! stack/arguments + 1

		pos: actions/find
			as red-series! blk
			stack/arguments
			null
			no
			no
			no
			null
			null
			no
			no
			yes											;-- /tail
			no

		either TYPE_OF(blk) = TYPE_NONE [
			;TBD: add default block processing
			0
		][
			s: GET_BUFFER(blk)
			end: s/tail

			while [pos < end][							;-- find first following block
				if TYPE_OF(pos) = TYPE_BLOCK [
					stack/reset
					interpreter/eval as red-block! pos	;-- do the block
					exit								;-- early exit with last value on stack
				]
				pos: pos + 1
			]
		]
		RETURN_NONE
	]

	case*: func [
		all? 	  [integer!]							;@@ not implemented yet
		/local
			value [red-value!]
			tail  [red-value!]
	][
		value: block/rs-head as red-block! stack/arguments
		tail:  block/rs-tail as red-block! stack/arguments
		if value = tail [RETURN_NONE]

		while [value < tail][
			value: interpreter/eval-next value tail no	;-- eval condition
			either logic/true? [
				either TYPE_OF(value) = TYPE_BLOCK [	;-- if true, eval what follows it
					stack/reset
					interpreter/eval as red-block! value
				][
					value: interpreter/eval-next value tail no
				]
				exit									;-- early exit with last value on stack
			][
				value: value + 1						;-- single value only allowed for cases bodies
			]
		]
		RETURN_NONE
	]

	do*: does [
		interpreter/eval as red-block! stack/arguments
	]

	get*: func [
		any? [integer!]
	][
		stack/set-last _context/get as red-word! stack/arguments
	]

	set*: func [
		any? [integer!]
		/local
			w	  [red-word!]
			value [red-value!]
			blk	  [red-block!]
	][
		w: as red-word! stack/arguments
		value: stack/arguments + 1

		either TYPE_OF(w) = TYPE_BLOCK [
			blk: as red-block! w
			set-many blk value block/rs-length? blk
			stack/set-last value
		][
			stack/set-last _context/set w value
		]
	]

	print*: does [
		lf?: yes
		prin*
		lf?: no
	]

	prin*: func [
		/local
			arg		[red-value!]
			str		[red-string!]
			series	[series!]
			offset	[byte-ptr!]
	][
		#if debug? = yes [if verbose > 0 [print-line "native/prin"]]

		arg: stack/arguments

		either TYPE_OF(arg) = TYPE_STRING [
			str: as red-string! arg
		][
			actions/form* -1
			str: as red-string! stack/arguments + 1
			assert any [
				TYPE_OF(str) = TYPE_STRING
				TYPE_OF(str) = TYPE_SYMBOL					;-- symbol! and string! structs are overlapping
			]
		]
		series: GET_BUFFER(str)
		offset: (as byte-ptr! series/offset) + (str/head << (GET_UNIT(series) >> 1))

		either lf? [
			switch GET_UNIT(series) [
				Latin1 [platform/print-line-Latin1 as c-string! offset]
				UCS-2  [platform/print-line-UCS2 				offset]
				UCS-4  [platform/print-line-UCS4   as int-ptr!  offset]

				default [									;@@ replace by an assertion
					print-line ["Error: unknown string encoding: " GET_UNIT(series)]
				]
			]
		][
			switch GET_UNIT(series) [
				Latin1 [platform/print-Latin1 as c-string! offset]
				UCS-2  [platform/print-UCS2   			   offset]
				UCS-4  [platform/print-UCS4   as int-ptr!  offset]

				default [									;@@ replace by an assertion
					print-line ["Error: unknown string encoding: " GET_UNIT(series)]
				]
			]
		]
		stack/set-last unset-value
	]

	compare: func [
		op		   [integer!]
		return:    [red-logic!]
		/local
			args   [red-value!]
			result [red-logic!]
	][
		args: stack/arguments
		result: as red-logic! args
		result/value: actions/compare args args + 1 op
		result/header: TYPE_LOGIC
		result
	]

	equal?*: func [
		return:    [red-logic!]
	][
		#if debug? = yes [if verbose > 0 [print-line "native/equal?"]]
		compare COMP_EQUAL
	]

	not-equal?*: func [
		return:    [red-logic!]
	][
		#if debug? = yes [if verbose > 0 [print-line "native/not-equal?"]]
		compare COMP_NOT_EQUAL
	]

	strict-equal?*: func [
		return:    [red-logic!]
	][
		#if debug? = yes [if verbose > 0 [print-line "native/strict-equal?"]]
		compare COMP_STRICT_EQUAL
	]

	lesser?*: func [
		return:    [red-logic!]
	][
		#if debug? = yes [if verbose > 0 [print-line "native/lesser?"]]
		compare COMP_LESSER
	]

	greater?*: func [
		return:    [red-logic!]
	][
		#if debug? = yes [if verbose > 0 [print-line "native/greater?"]]
		compare COMP_GREATER
	]

	lesser-or-equal?*: func [
		return:    [red-logic!]
	][
		#if debug? = yes [if verbose > 0 [print-line "native/lesser-or-equal?"]]
		compare COMP_LESSER_EQUAL
	]

	greater-or-equal?*: func [
		return:    [red-logic!]
	][
		#if debug? = yes [if verbose > 0 [print-line "native/greater-or-equal?"]]
		compare COMP_GREATER_EQUAL
	]

	same?*: does []

	not*: func [
		/local bool [red-logic!]
	][
		#if debug? = yes [if verbose > 0 [print-line "native/not"]]

		bool: as red-logic! stack/arguments
		bool/value: logic/false?						;-- run test before modifying stack
		bool/header: TYPE_LOGIC
	]

	halt*: does [halt]

	type?*: func [
		word?	 [integer!]
		return:  [red-value!]
		/local
			dt	 [red-datatype!]
			w	 [red-word!]
			name [names!]
	][
		either negative? word? [
			dt: as red-datatype! stack/arguments		;-- overwrite argument
			dt/value: TYPE_OF(dt)						;-- extract type before overriding
			dt/header: TYPE_DATATYPE
			as red-value! dt
		][
			w: as red-word! stack/arguments				;-- overwrite argument
			name: name-table + TYPE_OF(w)				;-- point to the right datatype name record
			stack/set-last as red-value! name/word
		]
	]

	load*: func [
		/local
			str [red-string!]
			s	[series!]
	][
		str: as red-string! stack/arguments
		s: GET_BUFFER(str)
		tokenizer/scan as c-string! s/offset null	;@@ temporary limited to Latin-1
	]

	reduce*: func [
		into [integer!]
		/local
			value [red-value!]
			tail  [red-value!]
			blk	  [red-block!]
			arg	  [red-value!]
	][
		arg: stack/arguments
		if TYPE_OF(arg) <> TYPE_BLOCK [					;-- pass-thru for non block! values
			interpreter/eval-expression arg arg + 1 no no
			exit
		]

		value: block/rs-head as red-block! arg
		tail:  block/rs-tail as red-block! arg

		stack/mark-native words/_body

		blk: either negative? into [
			block/push-only* (as-integer tail - value) >> 4
		][
			as red-block! arg + into
		]

		while [value < tail][
			value: interpreter/eval-next value tail yes
			block/append*
			stack/keep									;-- preserve the reduced block on stack
		]
		stack/unwind-last
	]

	compose-block: func [
		blk		[red-block!]
		deep?	[logic!]
		only?	[logic!]
		into	[red-block!]
		root?	[logic!]
		return: [red-block!]
		/local
			value  [red-value!]
			tail   [red-value!]
			new	   [red-block!]
			result [red-value!]
	][
		value: block/rs-head blk
		tail:  block/rs-tail blk

		new: either all [root? OPTION?(into)][
			into
		][
			block/push-only* (as-integer tail - value) >> 4
		]
		while [value < tail][
			switch TYPE_OF(value) [
				TYPE_BLOCK [
					blk: either deep? [
						compose-block as red-block! value deep? only? into no
					][
						as red-block! value
					]
					copy-cell as red-value! blk ALLOC_TAIL(new)
				]
				TYPE_PAREN [
					blk: as red-block! value
					unless zero? block/rs-length? blk [
						interpreter/eval blk
						result: stack/arguments
						blk: as red-block! result

						unless any [
							TYPE_OF(result) = TYPE_UNSET
							all [
								not only?
								TYPE_OF(result) = TYPE_BLOCK
								zero? block/rs-length? blk
							]
						][
							either any [
								only?
								TYPE_OF(result) <> TYPE_BLOCK
							][
								copy-cell result ALLOC_TAIL(new)
							][
								block/rs-append-block new as red-block! result
							]
						]
					]
				]
				default [
					copy-cell value ALLOC_TAIL(new)
				]
			]
			value: value + 1
		]
		new
	]

	compose*: func [
		deep [integer!]
		only [integer!]
		into [integer!]
	][
		arg: stack/arguments
		if TYPE_OF(arg) <> TYPE_BLOCK [					;-- pass-thru for non block! values
			interpreter/eval-expression arg arg + 1 no no
			exit
		]
		stack/set-last
			as red-value! compose-block
				as red-block! arg
				as logic! deep + 1
				as logic! only + 1
				as red-block! stack/arguments + into
				yes
	]

	;--- Natives helper functions ---

	loop?: func [
		series     [red-series!]
		return:    [logic!]
		/local
			s	   [series!]
	][
		s: GET_BUFFER(series)

		either TYPE_OF(series) = TYPE_BLOCK [			;@@ replace with any-block?/any-string? check
			s/offset + series/head < s/tail
		][
			(as byte-ptr! s/offset)
				+ (series/head << (GET_UNIT(s) >> 1))
				< (as byte-ptr! s/tail)
		]
	]

	set-many: func [
		words [red-block!]
		value [red-value!]
		size  [integer!]
		/local
			v		[red-value!]
			blk		[red-block!]
			i		[integer!]
			block?	[logic!]
	][
		block?: TYPE_OF(value) = TYPE_BLOCK
		if block? [blk: as red-block! value]
		i: 1

		while [i <= size][
			v: either block? [block/pick blk i][value]
			_context/set
				as red-word! block/pick words i
				v
			i: i + 1
		]
	]

	foreach-next-block: func [
		size	[integer!]								;-- number of words in the block
		return: [logic!]
		/local
			series [red-series!]
			blk    [red-block!]
			result [logic!]
	][
		blk:    as red-block!  stack/arguments - 1
		series: as red-series! stack/arguments - 2

		assert any [									;@@ replace with any-block?/any-string? check
			TYPE_OF(series) = TYPE_BLOCK
			TYPE_OF(series) = TYPE_STRING
		]
		assert TYPE_OF(blk) = TYPE_BLOCK

		set-many blk as red-value! series size
		result: loop? series
		series/head: series/head + size
		result
	]

	foreach-next: func [
		return: [logic!]
		/local
			series [red-series!]
			word   [red-word!]
			result [logic!]
	][
		word:   as red-word!   stack/arguments - 1
		series: as red-series! stack/arguments - 2

		assert any [									;@@ replace with any-block?/any-string? check
			TYPE_OF(series) = TYPE_BLOCK
			TYPE_OF(series) = TYPE_STRING
		]
		assert TYPE_OF(word) = TYPE_WORD

		_context/set word actions/pick series 1
		result: loop? series
		series/head: series/head + 1
		result
	]

	forall-loop: func [									;@@ inline?
		return: [logic!]
		/local
			series [red-series!]
			word   [red-word!]
	][
		word: as red-word! stack/arguments - 1
		assert TYPE_OF(word) = TYPE_WORD

		series: as red-series! _context/get word
		loop? series
	]

	forall-next: func [									;@@ inline?
		/local
			series [red-series!]
	][
		series: as red-series! _context/get as red-word! stack/arguments - 1
		series/head: series/head + 1
	]

	forall-end: func [									;@@ inline?
		/local
			series [red-series!]
			word   [red-word!]
	][
		word: 	as red-word!   stack/arguments - 1
		series: as red-series! stack/arguments - 2

		assert any [									;@@ replace with any-block?/any-string? check
			TYPE_OF(series) = TYPE_BLOCK
			TYPE_OF(series) = TYPE_STRING
		]
		assert TYPE_OF(word) = TYPE_WORD

		_context/set word as red-value! series			;-- reset series to its initial offset
	]

	register [
		:if*
		:unless*
		:either*
		:any*
		:all*
		:while*
		:until*
		:loop*
		:repeat*
		:foreach*
		:forall*
		:func*
		:function*
		:does*
		:has*
		:exit*
		:return*
		:switch*
		:case*
		:do*
		:get*
		:set*
		:print*
		:prin*
		:equal?*
		:not-equal?*
		:strict-equal?*
		:lesser?*
		:greater?*
		:lesser-or-equal?*
		:greater-or-equal?*
		:same?*
		:not*
		:halt*
		:type?*
		:load*
		:reduce*
		:compose*
	]

]

Red/System [
	Title:   "Red native functions"
	Author:  "Nenad Rakocevic"
	File: 	 %natives.reds
	Tabs:	 4
	Rights:  "Copyright (C) 2011-2012 Nenad Rakocevic. All rights reserved."
	License: {
		Distributed under the Boost Software License, Version 1.0.
		See https://github.com/dockimbel/Red/blob/master/BSL-License.txt
	}
]

#define RETURN_NONE [
	stack/reset
	none/push-last
	exit
]

#define RETURN_UNSET [
	stack/reset
	unset/push-last
]

natives: context [
	verbose: 0
	lf?: 	 no											;-- used to print or not an ending newline

	table: as int-ptr! allocate NATIVES_NB * size? integer!
	top: 0

	register: func [
		[variadic]
		count	   [integer!]
		list	   [int-ptr!]
		/local
			offset [integer!]
	][
		offset: 0

		until [
			table/top: list/value
			top: top + 1
			assert top < NATIVES_NB
			list: list + 1
			count: count - 1
			zero? count
		]
	]

	;--- Natives ----

	if*: does [
		either logic/false? [
			RETURN_NONE
		][
			interpreter/eval as red-block! stack/arguments + 1
		]
	]

	unless*: does [
		either logic/false? [
			interpreter/eval as red-block! stack/arguments + 1
		][
			RETURN_NONE
		]
	]

	either*: func [
		/local offset [integer!]
	][
		offset: either logic/true? [1][2]
		interpreter/eval as red-block! stack/arguments + offset
	]

	any*: func [
		/local
			value [red-value!]
			tail  [red-value!]
	][
		value: block/rs-head as red-block! stack/arguments
		tail:  block/rs-tail as red-block! stack/arguments

		while [value < tail][
			value: interpreter/eval-next value tail no
			if logic/true? [exit]
		]
		RETURN_NONE
	]

	all*: func [
		/local
			value [red-value!]
			tail  [red-value!]
	][
		value: block/rs-head as red-block! stack/arguments
		tail:  block/rs-tail as red-block! stack/arguments

		while [value < tail][
			value: interpreter/eval-next value tail no
			if logic/false? [RETURN_NONE]
		]
	]

	while*:	func [
		/local
			cond [red-block!]
			body [red-block!]
	][
		cond: as red-block! stack/arguments
		body: as red-block! stack/arguments + 1

		stack/mark-native words/_body
		while [
			interpreter/eval cond
			logic/true?
		][
			stack/reset
			interpreter/eval body
		]
		stack/unwind
		RETURN_UNSET
	]

	until*: func [
		/local
			body [red-block!]
	][
		body: as red-block! stack/arguments

		stack/mark-native words/_body
		until [
			stack/reset
			interpreter/eval body
			logic/true?
		]
		stack/unwind-last
	]

	loop*: func [
		/local
			body [red-block!]
			i	 [integer!]
	][
		i: integer/get*
		unless positive? i [RETURN_NONE]				;-- if counter <= 0, no loops

		body: as red-block! stack/arguments + 1

		stack/mark-native words/_body
		until [
			stack/reset
			interpreter/eval body
			i: i - 1
			zero? i
		]
		stack/unwind-last
	]

	repeat*: func [
		/local
			w	   [red-word!]
			body   [red-block!]
			count  [red-integer!]
			cnt	   [integer!]
			i	   [integer!]
	][
		w: 	   as red-word!    stack/arguments
		count: as red-integer! stack/arguments + 1
		body:  as red-block!   stack/arguments + 2

		i: integer/get as red-value! count
		unless positive? i [RETURN_NONE]				;-- if counter <= 0, no loops

		count/value: 1

		stack/mark-native words/_body
		until [
			stack/reset
			_context/set w as red-value! count
			interpreter/eval body
			count/value: count/value + 1
			i: i - 1
			zero? i
		]
		stack/unwind-last
	]

	foreach*: func [
		/local
			value [red-value!]
			body  [red-block!]
			size  [integer!]
	][
		value: stack/arguments
		body: as red-block! stack/arguments + 2

		stack/push stack/arguments + 1					;-- copy arguments to stack top in reverse order
		stack/push value								;-- (required by foreach-next)

		stack/mark-native words/_body

		either TYPE_OF(value) = TYPE_BLOCK [
			size: block/rs-length? as red-block! value

			while [foreach-next-block size][			;-- foreach [..]
				stack/reset
				interpreter/eval body
			]
		][
			while [foreach-next][						;-- foreach <word!>
				stack/reset
				interpreter/eval body
			]
		]
		stack/unwind-last
	]

	forall*: func [
		/local
			w 	   [red-word!]
			body   [red-block!]
			saved  [red-value!]
			series [red-series!]
	][
		w:    as red-word!  stack/arguments
		body: as red-block! stack/arguments + 1

		saved: word/get w							;-- save series (for resetting on end)
		w: word/push w								;-- word argument

		stack/mark-native words/_body
		while [
			loop? as red-series! _context/get w
		][
			stack/reset
			interpreter/eval body
			series: as red-series! _context/get w
			series/head: series/head + 1
		]
		stack/unwind-last
		_context/set w saved
	]

	func*:		does []
	function*:	does []
	does*:		does []
	has*:		does []
	exit*:		does []
	return*:	does []

	switch*: func [
		default? [integer!]								;@@ not implemented yet
		/local
			pos	 [red-value!]
			blk  [red-block!]
			end  [red-value!]
			s	 [series!]
	][
		blk: as red-block! stack/arguments + 1

		pos: actions/find
			as red-series! blk
			stack/arguments
			null
			no
			no
			no
			null
			null
			no
			no
			yes											;-- /tail
			no

		either TYPE_OF(blk) = TYPE_NONE [
			;TBD: add default block processing
			0
		][
			s: GET_BUFFER(blk)
			end: s/tail

			while [pos < end][							;-- find first following block
				if TYPE_OF(pos) = TYPE_BLOCK [
					stack/reset
					interpreter/eval as red-block! pos	;-- do the block
					exit								;-- early exit with last value on stack
				]
				pos: pos + 1
			]
		]
		RETURN_NONE
	]

	case*: func [
		all? 	  [integer!]							;@@ not implemented yet
		/local
			value [red-value!]
			tail  [red-value!]
	][
		value: block/rs-head as red-block! stack/arguments
		tail:  block/rs-tail as red-block! stack/arguments
		if value = tail [RETURN_NONE]

		while [value < tail][
			value: interpreter/eval-next value tail no	;-- eval condition
			either logic/true? [
				either TYPE_OF(value) = TYPE_BLOCK [	;-- if true, eval what follows it
					stack/reset
					interpreter/eval as red-block! value
				][
					value: interpreter/eval-next value tail no
				]
				exit									;-- early exit with last value on stack
			][
				value: value + 1						;-- single value only allowed for cases bodies
			]
		]
		RETURN_NONE
	]

	do*: does [
		interpreter/eval as red-block! stack/arguments
	]

	get*: func [
		any? [integer!]
	][
		stack/set-last _context/get as red-word! stack/arguments
	]

	set*: func [
		any? [integer!]
		/local
			w	  [red-word!]
			value [red-value!]
			blk	  [red-block!]
	][
		w: as red-word! stack/arguments
		value: stack/arguments + 1

		either TYPE_OF(w) = TYPE_BLOCK [
			blk: as red-block! w
			set-many blk value block/rs-length? blk
			stack/set-last value
		][
			stack/set-last _context/set w value
		]
	]

	print*: does [
		lf?: yes
		prin*
		lf?: no
	]

	prin*: func [
		/local
			arg		[red-value!]
			str		[red-string!]
			series	[series!]
			offset	[byte-ptr!]
	][
		#if debug? = yes [if verbose > 0 [print-line "native/prin"]]

		arg: stack/arguments

		either TYPE_OF(arg) = TYPE_STRING [
			str: as red-string! arg
		][
			actions/form* -1
			str: as red-string! stack/arguments + 1
			assert any [
				TYPE_OF(str) = TYPE_STRING
				TYPE_OF(str) = TYPE_SYMBOL					;-- symbol! and string! structs are overlapping
			]
		]
		series: GET_BUFFER(str)
		offset: (as byte-ptr! series/offset) + (str/head << (GET_UNIT(series) >> 1))

		either lf? [
			switch GET_UNIT(series) [
				Latin1 [platform/print-line-Latin1 as c-string! offset]
				UCS-2  [platform/print-line-UCS2 				offset]
				UCS-4  [platform/print-line-UCS4   as int-ptr!  offset]

				default [									;@@ replace by an assertion
					print-line ["Error: unknown string encoding: " GET_UNIT(series)]
				]
			]
		][
			switch GET_UNIT(series) [
				Latin1 [platform/print-Latin1 as c-string! offset]
				UCS-2  [platform/print-UCS2   			   offset]
				UCS-4  [platform/print-UCS4   as int-ptr!  offset]

				default [									;@@ replace by an assertion
					print-line ["Error: unknown string encoding: " GET_UNIT(series)]
				]
			]
		]
		stack/set-last unset-value
	]

	compare: func [
		op		   [integer!]
		return:    [red-logic!]
		/local
			args   [red-value!]
			result [red-logic!]
	][
		args: stack/arguments
		result: as red-logic! args
		result/value: actions/compare args args + 1 op
		result/header: TYPE_LOGIC
		result
	]

	equal?*: func [
		return:    [red-logic!]
	][
		#if debug? = yes [if verbose > 0 [print-line "native/equal?"]]
		compare COMP_EQUAL
	]

	not-equal?*: func [
		return:    [red-logic!]
	][
		#if debug? = yes [if verbose > 0 [print-line "native/not-equal?"]]
		compare COMP_NOT_EQUAL
	]

	strict-equal?*: func [
		return:    [red-logic!]
	][
		#if debug? = yes [if verbose > 0 [print-line "native/strict-equal?"]]
		compare COMP_STRICT_EQUAL
	]

	lesser?*: func [
		return:    [red-logic!]
	][
		#if debug? = yes [if verbose > 0 [print-line "native/lesser?"]]
		compare COMP_LESSER
	]

	greater?*: func [
		return:    [red-logic!]
	][
		#if debug? = yes [if verbose > 0 [print-line "native/greater?"]]
		compare COMP_GREATER
	]

	lesser-or-equal?*: func [
		return:    [red-logic!]
	][
		#if debug? = yes [if verbose > 0 [print-line "native/lesser-or-equal?"]]
		compare COMP_LESSER_EQUAL
	]

	greater-or-equal?*: func [
		return:    [red-logic!]
	][
		#if debug? = yes [if verbose > 0 [print-line "native/greater-or-equal?"]]
		compare COMP_GREATER_EQUAL
	]

	same?*: does []

	not*: func [
		/local bool [red-logic!]
	][
		#if debug? = yes [if verbose > 0 [print-line "native/not"]]

		bool: as red-logic! stack/arguments
		bool/value: logic/false?						;-- run test before modifying stack
		bool/header: TYPE_LOGIC
	]

	halt*: does [halt]

	type?*: func [
		word?	 [integer!]
		return:  [red-value!]
		/local
			dt	 [red-datatype!]
			w	 [red-word!]
			name [names!]
	][
		either negative? word? [
			dt: as red-datatype! stack/arguments		;-- overwrite argument
			dt/value: TYPE_OF(dt)						;-- extract type before overriding
			dt/header: TYPE_DATATYPE
			as red-value! dt
		][
			w: as red-word! stack/arguments				;-- overwrite argument
			name: name-table + TYPE_OF(w)				;-- point to the right datatype name record
			stack/set-last as red-value! name/word
		]
	]

	load*: func [
		/local
			str [red-string!]
			s	[series!]
	][
		str: as red-string! stack/arguments
		s: GET_BUFFER(str)
		tokenizer/scan as c-string! s/offset null	;@@ temporary limited to Latin-1
	]

	reduce*: func [
		into [integer!]
		/local
			value [red-value!]
			tail  [red-value!]
			blk	  [red-block!]
			arg	  [red-value!]
	][
		arg: stack/arguments
		if TYPE_OF(arg) <> TYPE_BLOCK [					;-- pass-thru for non block! values
			interpreter/eval-expression arg arg + 1 no no
			exit
		]

		value: block/rs-head as red-block! arg
		tail:  block/rs-tail as red-block! arg

		stack/mark-native words/_body

		blk: either negative? into [
			block/push-only* (as-integer tail - value) >> 4
		][
			as red-block! arg + into
		]

		while [value < tail][
			value: interpreter/eval-next value tail yes
			block/append*
			stack/keep									;-- preserve the reduced block on stack
		]
		stack/unwind-last
	]

	compose-block: func [
		blk		[red-block!]
		deep?	[logic!]
		only?	[logic!]
		into	[integer!]
		root?	[logic!]
		return: [red-block!]
		/local
			value  [red-value!]
			tail   [red-value!]
			new	   [red-block!]
			result [red-value!]
	][
		value: block/rs-head blk
		tail:  block/rs-tail blk

		new: either all [root? into >= 0][
			as red-block! stack/arguments + into
		][
			block/push-only* (as-integer tail - value) >> 4
		]
		while [value < tail][
			switch TYPE_OF(value) [
				TYPE_BLOCK [
					blk: either deep? [
						compose-block as red-block! value deep? only? into no
					][
						as red-block! value
					]
					copy-cell as red-value! blk ALLOC_TAIL(new)
				]
				TYPE_PAREN [
					blk: as red-block! value
					unless zero? block/rs-length? blk [
						interpreter/eval blk
						result: stack/arguments
						blk: as red-block! result

						unless any [
							TYPE_OF(result) = TYPE_UNSET
							all [
								TYPE_OF(result) = TYPE_BLOCK
								zero? block/rs-length? blk
							]
						][
							either any [
								only?
								TYPE_OF(result) <> TYPE_BLOCK
							][
								copy-cell result ALLOC_TAIL(new)
							][
								block/rs-append-block new as red-block! result
							]
						]
					]
				]
				default [
					copy-cell value ALLOC_TAIL(new)
				]
			]
			value: value + 1
		]
		new
	]

	compose*: func [
		deep [integer!]
		only [integer!]
		into [integer!]
	][
		arg: stack/arguments
		if TYPE_OF(arg) <> TYPE_BLOCK [					;-- pass-thru for non block! values
			interpreter/eval-expression arg arg + 1 no no
			exit
		]
		stack/set-last
			as red-value! compose-block
				as red-block! arg
				as logic! deep + 1
				as logic! only + 1
				into
				yes
	]

	;--- Natives helper functions ---

	loop?: func [
		series     [red-series!]
		return:    [logic!]
		/local
			s	   [series!]
	][
		s: GET_BUFFER(series)

		either TYPE_OF(series) = TYPE_BLOCK [			;@@ replace with any-block?/any-string? check
			s/offset + series/head < s/tail
		][
			(as byte-ptr! s/offset)
				+ (series/head << (GET_UNIT(s) >> 1))
				< (as byte-ptr! s/tail)
		]
	]

	set-many: func [
		words [red-block!]
		value [red-value!]
		size  [integer!]
		/local
			v		[red-value!]
			blk		[red-block!]
			i		[integer!]
			block?	[logic!]
	][
		block?: TYPE_OF(value) = TYPE_BLOCK
		if block? [blk: as red-block! value]
		i: 1

		while [i <= size][
			v: either block? [block/pick blk i][value]
			_context/set
				as red-word! block/pick words i
				v
			i: i + 1
		]
	]

	foreach-next-block: func [
		size	[integer!]								;-- number of words in the block
		return: [logic!]
		/local
			series [red-series!]
			blk    [red-block!]
			result [logic!]
	][
		blk:    as red-block!  stack/arguments - 1
		series: as red-series! stack/arguments - 2

		assert any [									;@@ replace with any-block?/any-string? check
			TYPE_OF(series) = TYPE_BLOCK
			TYPE_OF(series) = TYPE_STRING
		]
		assert TYPE_OF(blk) = TYPE_BLOCK

		set-many blk as red-value! series size
		result: loop? series
		series/head: series/head + size
		result
	]

	foreach-next: func [
		return: [logic!]
		/local
			series [red-series!]
			word   [red-word!]
			result [logic!]
	][
		word:   as red-word!   stack/arguments - 1
		series: as red-series! stack/arguments - 2

		assert any [									;@@ replace with any-block?/any-string? check
			TYPE_OF(series) = TYPE_BLOCK
			TYPE_OF(series) = TYPE_STRING
		]
		assert TYPE_OF(word) = TYPE_WORD

		_context/set word actions/pick series 1
		result: loop? series
		series/head: series/head + 1
		result
	]

	forall-loop: func [									;@@ inline?
		return: [logic!]
		/local
			series [red-series!]
			word   [red-word!]
	][
		word: as red-word! stack/arguments - 1
		assert TYPE_OF(word) = TYPE_WORD

		series: as red-series! _context/get word
		loop? series
	]

	forall-next: func [									;@@ inline?
		/local
			series [red-series!]
	][
		series: as red-series! _context/get as red-word! stack/arguments - 1
		series/head: series/head + 1
	]

	forall-end: func [									;@@ inline?
		/local
			series [red-series!]
			word   [red-word!]
	][
		word: 	as red-word!   stack/arguments - 1
		series: as red-series! stack/arguments - 2

		assert any [									;@@ replace with any-block?/any-string? check
			TYPE_OF(series) = TYPE_BLOCK
			TYPE_OF(series) = TYPE_STRING
		]
		assert TYPE_OF(word) = TYPE_WORD

		_context/set word as red-value! series			;-- reset series to its initial offset
	]

	register [
		:if*
		:unless*
		:either*
		:any*
		:all*
		:while*
		:until*
		:loop*
		:repeat*
		:foreach*
		:forall*
		:func*
		:function*
		:does*
		:has*
		:exit*
		:return*
		:switch*
		:case*
		:do*
		:get*
		:set*
		:print*
		:prin*
		:equal?*
		:not-equal?*
		:strict-equal?*
		:lesser?*
		:greater?*
		:lesser-or-equal?*
		:greater-or-equal?*
		:same?*
		:not*
		:halt*
		:type?*
		:load*
		:reduce*
		:compose*
	]

]


FEAT: collation table access from SYSTEM object removed temporary.

This is done to avoid users relying on that feature until we figure out if it is safe or not to use once multitasking will be added.

Red [
	Title:   "Red system object definition"
	Author:  "Nenad Rakocevic"
	File: 	 %system.red
	Tabs:	 4
	Rights:  "Copyright (C) 2011-2015 Nenad Rakocevic. All rights reserved."
	License: {
		Distributed under the Boost Software License, Version 1.0.
		See https://github.com/red/red/blob/master/BSL-License.txt
	}
]

system: context [
	version: #version
	build:	 #build-date

	words: #system [
		obj: as red-object! stack/push*
		obj/header: TYPE_OBJECT
		obj/ctx:	global-ctx
		obj/class:	-1
		obj/on-set:	null
	]

	platform: func ["Return a word identifying the operating system"][
		#system [
			#switch OS [
				Windows  [SET_RETURN(words/_windows)]
				Syllable [SET_RETURN(words/_syllable)]
				MacOSX	 [SET_RETURN(words/_macosx)]
				#default [SET_RETURN(words/_linux)]
			]
		]
	]

	catalog: context [
		datatypes:
		actions:
		natives: none

		errors: context [
			throw: object [
				code:				0
				type:				"Throw error"
				break:				"no loop to break"
				return:				"return or exit not in function"
				throw:				["no catch for throw:" :arg1]
				continue:			"no loop to continue"
			]
			note: object [
				code:				100
				type:				"note"
				no-load:			["cannot load: " :arg1]
			]
			syntax: object [
				code:				200
				type:				"Syntax error"
				invalid:			["invalid" :arg1 "at" :arg2]
				missing:			["missing" :arg2 "at" :arg1]
				no-header:			["script is missing a Red header:" :arg1]
				no-rs-header:		["script is missing a Red/System header:" :arg1]
				bad-header:			["script header is not valid:" :arg1]
				malconstruct:		["invalid construction spec:" :arg1]
				bad-char:			["invalid character in:" :arg1]
			]
			script: object [
				code:				300
				type:				"Script error"
				no-value:			[:arg1 "has no value"]
				need-value:			[:arg1 "needs a value"]
				not-defined:		[:arg1 "word is not bound to a context"]
				not-in-context:		[:arg1 "is not in the specified context"]
				no-arg:				[:arg1 "is missing its" :arg2 "argument"]
				expect-arg:			[:arg1 "does not allow" :arg2 "for its" :arg3 "argument"]
				expect-val:			["expected" :arg1 "not" :arg2]
				expect-type:		[:arg1 :arg2 "field must be of type" :arg3]
				cannot-use:			["cannot use" :arg1 "on" :arg2 "value"]
				invalid-arg:		["invalid argument:" :arg1]
				invalid-type:		[:arg1 "type is not allowed here"]
				invalid-op:			["invalid operator:" :arg1]
				no-op-arg:			[:arg1 "operator is missing an argument"]
				invalid-data:		["data not in correct format:" :arg1]
				invalid-part:		["invalid /part count:" :arg1]
				not-same-type:		"values must be of the same type"
				not-related:		["incompatible argument for" :arg1 "of" :arg2]
				bad-func-def:		["invalid function definition:" :arg1]
				bad-func-arg:		["function argument" :arg1 "is not valid"]
				bad-func-extern:	["invalid /extern value" :arg1]
				no-refine:			[:arg1 "has no refinement called" :arg2]
				bad-refines:		"incompatible or invalid refinements"
				bad-refine:			["incompatible refinement:" :arg1]
				invalid-path:		["cannot access" :arg2 "in path" :arg1]
				invalid-path-set:	["unsupported type in" :arg1 "set-path"]
				invalid-path-get:	["unsupported type in" :arg1 "get-path"]
				bad-path-type:		["path" :arg1 "is not valid for" :arg2 "type"]
				bad-path-set:		["cannot set" :arg2 "in path" :arg1]
				bad-field-set:		["cannot set" :arg1 "field to" :arg2 "datatype"]
				dup-vars:			["duplicate variable specified:" :arg1]
				past-end:			"out of range or past end"
				missing-arg:		"missing a required argument or refinement"
				out-of-range:		["value out of range:" :arg1]
				invalid-chars:		"contains invalid characters"
				invalid-compare:	["cannot compare" :arg1 "with" :arg2]
				wrong-type:			["datatype assertion failed for:" :arg1]
				invalid-refine-arg: ["invalid" :arg1 "argument:" :arg2]
				type-limit:			[:arg1 "overflow/underflow"]
				size-limit:			["maximum limit reached:" :arg1]
				no-return:			"block did not return a value"
				throw-usage:		"invalid use of a thrown error value"
				;locked-word:		["protected variable - cannot modify:" :arg1]
				;protected:			"protected value or series - cannot modify"
				;self-protected:	"cannot set/unset self - it is protected"
				bad-bad:			[:arg1 "error:" :arg2]
				bad-make-arg:		["cannot MAKE/TO" :arg1 "from:" :arg2]
				invalid-spec-field: ["invalid" :arg1 "field in spec block"]
				missing-spec-field: [:arg1 "not found in spec block"]
				;bad-decode:		"missing or unsupported encoding marker"
				;already-used:		["alias word is already in use:" :arg1]
				;wrong-denom:		[:arg1 "not same denomination as" :arg2]
				;bad-press:			["invalid compressed data - problem:" :arg1]
				;dialect:			["incorrect" :arg1 "dialect usage at:" :arg2]
				parse-rule:			["PARSE - invalid rule or usage of rule:" :arg1]
				parse-end:			["PARSE - unexpected end of rule after:" :arg1]
				;parse-variable:	["PARSE - expected a variable, not:" :arg1]
				;parse-command:		"PARSE - command cannot be used as variable:" :arg1]
				parse-invalid-ref:	["PARSE - get-word refers to a different series!" :arg1]
				parse-series:		["PARSE - input must be a series:" :arg1]
				parse-unsupported:	"PARSE - matching by datatype not supported for any-string! input"
			]
			math: object [
				code:				400
				type:				"Math error"
				zero-divide:		"attempt to divide by zero"
				overflow:			"math or number overflow"
				positive:			"positive number required"
			]
			access: object [
				code:				500
				type:				"Access error"
				;cannot-open:		["cannot open:" :arg1 "reason:" :arg2]
				;not-open:			["port is not open:" :arg1]
				;already-open:		["port is already open:" :arg1]
				;no-connect:		["cannot connect:" :arg1 "reason:" :arg2]
				;not-connected:		["port is not connected:" :arg1]
				;no-script:			["script not found:" :arg1]
				;no-scheme-name:	["new scheme must have a name:" :arg1]
				;no-scheme:			["missing port scheme:" :arg1]
				;invalid-spec:		["invalid spec or options:" :arg1]
				;invalid-port:		["invalid port object (invalid field values)"]
				;invalid-actor:		["invalid port actor (must be native or object)"]
				;invalid-port-arg:	["invalid port argument:" arg1]
				;no-port-action:	["this port does not support:" :arg1]
				;protocol:			["protocol error:" :arg1]
				;invalid-check:		["invalid checksum (tampered file):" :arg1]
				;write-error:		["write failed:" :arg1 "reason:" :arg2]
				;read-error:		["read failed:" :arg1 "reason:" :arg2]
				;read-only:			["read-only - write not allowed:" :arg1]
				;no-buffer:			["port has no data buffer:" :arg1]
				;timeout:			["port action timed out:" :arg1]
				;no-create:			["cannot create:" :arg1]
				;no-delete:			["cannot delete:" :arg1]
				;no-rename:			["cannot rename:" :arg1]
				;bad-file-path:		["bad file path:" :arg1]
				;bad-file-mode:		["bad file mode:" :arg1]
				;security:			["security violation:" :arg1 " (refer to SECURE function)"]
				;security-level:	["attempt to lower security to" :arg1]
				;security-error:	["invalid" :arg1 "security policy:" :arg2]
				;no-codec:			["cannot decode or encode (no codec):" :arg1]
				;bad-media:			["bad media data (corrupt image, sound, video)"]
				;no-extension:		["cannot open extension:" :arg1]
				;bad-extension:		["invalid extension format:" :arg1]
				;extension-init:	["extension cannot be initialized (check version):" :arg1]
				;call-fail:			["external process failed:" :arg1]
			]
			user: object [
				code:				800
				type:				"User error"
				message:			[:arg1]
			]
			internal: object [
				code:				900
				type:				"Internal error"
				bad-path:			["bad path:" arg1]
				not-here:			[arg1 "not supported on your system"]
				no-memory:			"not enough memory"
				stack-overflow:		"stack overflow"
				;bad-series:		"invalid series"
				;limit-hit:			["internal limit reached:" :arg1]
				;bad-sys-func:		["invalid or missing system function:" :arg1]
				feature-na:			"feature not available"
				not-done:			"reserved for future use (or not yet implemented)"
				invalid-error:		"error object or fields were not valid"
			]
		]

	]

	state: context [
		interpreted?: func ["Return TRUE if called from the interpreter"][
			#system [logic/box stack/eval? null]
		]

		last-error: none
	]

	modules: make block! 8
	codecs:  context []
	schemes: context []
	ports:	 context []

	locale: context [
		language:
		language*:										;-- in locale language
		locale:
		locale*: none									;-- in locale language

		;collation: context [
		;	lower-to-upper: #system [stack/set-last as cell! case-folding/lower-to-upper]
		;	upper-to-lower: #system [stack/set-last as cell! case-folding/upper-to-lower]
		;]

		months: [
		  "January" "February" "March" "April" "May" "June"
		  "July" "August" "September" "October" "November" "December"
		]

		days: [
		  "Monday" "Tuesday" "Wednesday" "Thursday" "Friday" "Saturday" "Sunday"
		]
	]

	options: context [
		boot: 			none
		home: 			none
		path: 			none
		script: 		none
		args: 			none
		do-arg: 		none
		debug: 			none
		secure: 		none
		quiet: 			false
		binary-base: 	16
		decimal-digits: 15
		module-paths: 	make block! 1
		file-types: 	none

		;-- change the way float numbers are processed
		float: context [
			pretty?: false
			full?: 	 false

			on-change*: func [word old new][
				switch word [
					pretty? [
						either new [
							#system [float/pretty-print?: yes]
						][
							#system [float/pretty-print?: no]
						]
					]
					full? [
						either new [
							#system [float/full-support?: yes]
						][
							#system [float/full-support?: no]
						]
					]
				]
			]
		]
	]

	script: context [
		title: header: parent: path: args: none
	]

	standard: context [
		header: context [
			title: name: type: version: date: file: author: needs: none
		]
		error: context [
			code: type: id: arg1: arg2: arg3: near: where: stack: none
		]
	]

	view: context [
		screen: 	none
		event-port: none

		metrics: context [
			screen-size: 	none
			dpi:			none
			;scaling:		1x1
		]
	]

	lexer: none
	console: none
]

Red [
	Title:   "Red system object definition"
	Author:  "Nenad Rakocevic"
	File: 	 %system.red
	Tabs:	 4
	Rights:  "Copyright (C) 2011-2015 Nenad Rakocevic. All rights reserved."
	License: {
		Distributed under the Boost Software License, Version 1.0.
		See https://github.com/red/red/blob/master/BSL-License.txt
	}
]

system: context [
	version: #version
	build:	 #build-date

	words: #system [
		obj: as red-object! stack/push*
		obj/header: TYPE_OBJECT
		obj/ctx:	global-ctx
		obj/class:	-1
		obj/on-set:	null
	]

	platform: func ["Return a word identifying the operating system"][
		#system [
			#switch OS [
				Windows  [SET_RETURN(words/_windows)]
				Syllable [SET_RETURN(words/_syllable)]
				MacOSX	 [SET_RETURN(words/_macosx)]
				#default [SET_RETURN(words/_linux)]
			]
		]
	]

	catalog: context [
		datatypes:
		actions:
		natives: none

		errors: context [
			throw: object [
				code:				0
				type:				"Throw error"
				break:				"no loop to break"
				return:				"return or exit not in function"
				throw:				["no catch for throw:" :arg1]
				continue:			"no loop to continue"
			]
			note: object [
				code:				100
				type:				"note"
				no-load:			["cannot load: " :arg1]
			]
			syntax: object [
				code:				200
				type:				"Syntax error"
				invalid:			["invalid" :arg1 "at" :arg2]
				missing:			["missing" :arg2 "at" :arg1]
				no-header:			["script is missing a Red header:" :arg1]
				no-rs-header:		["script is missing a Red/System header:" :arg1]
				bad-header:			["script header is not valid:" :arg1]
				malconstruct:		["invalid construction spec:" :arg1]
				bad-char:			["invalid character in:" :arg1]
			]
			script: object [
				code:				300
				type:				"Script error"
				no-value:			[:arg1 "has no value"]
				need-value:			[:arg1 "needs a value"]
				not-defined:		[:arg1 "word is not bound to a context"]
				not-in-context:		[:arg1 "is not in the specified context"]
				no-arg:				[:arg1 "is missing its" :arg2 "argument"]
				expect-arg:			[:arg1 "does not allow" :arg2 "for its" :arg3 "argument"]
				expect-val:			["expected" :arg1 "not" :arg2]
				expect-type:		[:arg1 :arg2 "field must be of type" :arg3]
				cannot-use:			["cannot use" :arg1 "on" :arg2 "value"]
				invalid-arg:		["invalid argument:" :arg1]
				invalid-type:		[:arg1 "type is not allowed here"]
				invalid-op:			["invalid operator:" :arg1]
				no-op-arg:			[:arg1 "operator is missing an argument"]
				invalid-data:		["data not in correct format:" :arg1]
				invalid-part:		["invalid /part count:" :arg1]
				not-same-type:		"values must be of the same type"
				not-related:		["incompatible argument for" :arg1 "of" :arg2]
				bad-func-def:		["invalid function definition:" :arg1]
				bad-func-arg:		["function argument" :arg1 "is not valid"]
				bad-func-extern:	["invalid /extern value" :arg1]
				no-refine:			[:arg1 "has no refinement called" :arg2]
				bad-refines:		"incompatible or invalid refinements"
				bad-refine:			["incompatible refinement:" :arg1]
				invalid-path:		["cannot access" :arg2 "in path" :arg1]
				invalid-path-set:	["unsupported type in" :arg1 "set-path"]
				invalid-path-get:	["unsupported type in" :arg1 "get-path"]
				bad-path-type:		["path" :arg1 "is not valid for" :arg2 "type"]
				bad-path-set:		["cannot set" :arg2 "in path" :arg1]
				bad-field-set:		["cannot set" :arg1 "field to" :arg2 "datatype"]
				dup-vars:			["duplicate variable specified:" :arg1]
				past-end:			"out of range or past end"
				missing-arg:		"missing a required argument or refinement"
				out-of-range:		["value out of range:" :arg1]
				invalid-chars:		"contains invalid characters"
				invalid-compare:	["cannot compare" :arg1 "with" :arg2]
				wrong-type:			["datatype assertion failed for:" :arg1]
				invalid-refine-arg: ["invalid" :arg1 "argument:" :arg2]
				type-limit:			[:arg1 "overflow/underflow"]
				size-limit:			["maximum limit reached:" :arg1]
				no-return:			"block did not return a value"
				throw-usage:		"invalid use of a thrown error value"
				;locked-word:		["protected variable - cannot modify:" :arg1]
				;protected:			"protected value or series - cannot modify"
				;self-protected:	"cannot set/unset self - it is protected"
				bad-bad:			[:arg1 "error:" :arg2]
				bad-make-arg:		["cannot MAKE/TO" :arg1 "from:" :arg2]
				invalid-spec-field: ["invalid" :arg1 "field in spec block"]
				missing-spec-field: [:arg1 "not found in spec block"]
				;bad-decode:		"missing or unsupported encoding marker"
				;already-used:		["alias word is already in use:" :arg1]
				;wrong-denom:		[:arg1 "not same denomination as" :arg2]
				;bad-press:			["invalid compressed data - problem:" :arg1]
				;dialect:			["incorrect" :arg1 "dialect usage at:" :arg2]
				parse-rule:			["PARSE - invalid rule or usage of rule:" :arg1]
				parse-end:			["PARSE - unexpected end of rule after:" :arg1]
				;parse-variable:	["PARSE - expected a variable, not:" :arg1]
				;parse-command:		"PARSE - command cannot be used as variable:" :arg1]
				parse-invalid-ref:	["PARSE - get-word refers to a different series!" :arg1]
				parse-series:		["PARSE - input must be a series:" :arg1]
				parse-unsupported:	"PARSE - matching by datatype not supported for any-string! input"
			]
			math: object [
				code:				400
				type:				"Math error"
				zero-divide:		"attempt to divide by zero"
				overflow:			"math or number overflow"
				positive:			"positive number required"
			]
			access: object [
				code:				500
				type:				"Access error"
				;cannot-open:		["cannot open:" :arg1 "reason:" :arg2]
				;not-open:			["port is not open:" :arg1]
				;already-open:		["port is already open:" :arg1]
				;no-connect:		["cannot connect:" :arg1 "reason:" :arg2]
				;not-connected:		["port is not connected:" :arg1]
				;no-script:			["script not found:" :arg1]
				;no-scheme-name:	["new scheme must have a name:" :arg1]
				;no-scheme:			["missing port scheme:" :arg1]
				;invalid-spec:		["invalid spec or options:" :arg1]
				;invalid-port:		["invalid port object (invalid field values)"]
				;invalid-actor:		["invalid port actor (must be native or object)"]
				;invalid-port-arg:	["invalid port argument:" arg1]
				;no-port-action:	["this port does not support:" :arg1]
				;protocol:			["protocol error:" :arg1]
				;invalid-check:		["invalid checksum (tampered file):" :arg1]
				;write-error:		["write failed:" :arg1 "reason:" :arg2]
				;read-error:		["read failed:" :arg1 "reason:" :arg2]
				;read-only:			["read-only - write not allowed:" :arg1]
				;no-buffer:			["port has no data buffer:" :arg1]
				;timeout:			["port action timed out:" :arg1]
				;no-create:			["cannot create:" :arg1]
				;no-delete:			["cannot delete:" :arg1]
				;no-rename:			["cannot rename:" :arg1]
				;bad-file-path:		["bad file path:" :arg1]
				;bad-file-mode:		["bad file mode:" :arg1]
				;security:			["security violation:" :arg1 " (refer to SECURE function)"]
				;security-level:	["attempt to lower security to" :arg1]
				;security-error:	["invalid" :arg1 "security policy:" :arg2]
				;no-codec:			["cannot decode or encode (no codec):" :arg1]
				;bad-media:			["bad media data (corrupt image, sound, video)"]
				;no-extension:		["cannot open extension:" :arg1]
				;bad-extension:		["invalid extension format:" :arg1]
				;extension-init:	["extension cannot be initialized (check version):" :arg1]
				;call-fail:			["external process failed:" :arg1]
			]
			user: object [
				code:				800
				type:				"User error"
				message:			[:arg1]
			]
			internal: object [
				code:				900
				type:				"Internal error"
				bad-path:			["bad path:" arg1]
				not-here:			[arg1 "not supported on your system"]
				no-memory:			"not enough memory"
				stack-overflow:		"stack overflow"
				;bad-series:		"invalid series"
				;limit-hit:			["internal limit reached:" :arg1]
				;bad-sys-func:		["invalid or missing system function:" :arg1]
				feature-na:			"feature not available"
				not-done:			"reserved for future use (or not yet implemented)"
				invalid-error:		"error object or fields were not valid"
			]
		]

	]

	state: context [
		interpreted?: func ["Return TRUE if called from the interpreter"][
			#system [logic/box stack/eval? null]
		]

		last-error: none
	]

	modules: make block! 8
	codecs:  context []
	schemes: context []
	ports:	 context []

	locale: context [
		language:
		language*:										;-- in locale language
		locale:
		locale*: none									;-- in locale language

		collation: context [
			lower-to-upper: #system [stack/set-last as cell! case-folding/lower-to-upper]
			upper-to-lower: #system [stack/set-last as cell! case-folding/upper-to-lower]
		]

		months: [
		  "January" "February" "March" "April" "May" "June"
		  "July" "August" "September" "October" "November" "December"
		]

		days: [
		  "Monday" "Tuesday" "Wednesday" "Thursday" "Friday" "Saturday" "Sunday"
		]
	]

	options: context [
		boot: 			none
		home: 			none
		path: 			none
		script: 		none
		args: 			none
		do-arg: 		none
		debug: 			none
		secure: 		none
		quiet: 			false
		binary-base: 	16
		decimal-digits: 15
		module-paths: 	make block! 1
		file-types: 	none

		;-- change the way float numbers are processed
		float: context [
			pretty?: false
			full?: 	 false

			on-change*: func [word old new][
				switch word [
					pretty? [
						either new [
							#system [float/pretty-print?: yes]
						][
							#system [float/pretty-print?: no]
						]
					]
					full? [
						either new [
							#system [float/full-support?: yes]
						][
							#system [float/full-support?: no]
						]
					]
				]
			]
		]
	]

	script: context [
		title: header: parent: path: args: none
	]

	standard: context [
		header: context [
			title: name: type: version: date: file: author: needs: none
		]
		error: context [
			code: type: id: arg1: arg2: arg3: near: where: stack: none
		]
	]

	view: context [
		screen: 	none
		event-port: none

		metrics: context [
			screen-size: 	none
			dpi:			none
			;scaling:		1x1
		]
	]

	lexer: none
	console: none
]