(function (Prism) {

	var comment_inside = {
		'function': /\b(?:BUGS?|FIX(?:MES?)?|NOTES?|TODOS?|XX+|HACKS?|WARN(?:ING)?|\?{2,}|!{2,})\b/
	};
	var string_inside = {
		'number': /\\[^\s']|%\w/
	};

	var factor = {
		'comment': [
			{
				// ! single-line exclamation point comments with whitespace after/around the !
				pattern: /(^|\s)(?:! .*|!$)/,
				lookbehind: true,
				inside: comment_inside
			},

			/* from basis/multiline: */
			{
				// /* comment */, /* comment*/
				pattern: /(^|\s)\/\*\s[\s\S]*?\*\/(?=\s|$)/,
				lookbehind: true,
				greedy: true,
				inside: comment_inside
			},
			{
				// ![[ comment ]] , ![===[ comment]===]
				pattern: /(^|\s)!\[(={0,6})\[\s[\s\S]*?\]\2\](?=\s|$)/,
				lookbehind: true,
				greedy: true,
				inside: comment_inside
			}
		],

		'number': [
			{
				// basic base 10 integers 9, -9
				pattern: /(^|\s)[+-]?\d+(?=\s|$)/,
				lookbehind: true
			},
			{
				// base prefix integers 0b010 0o70 0xad 0d10 0XAD -0xa9
				pattern: /(^|\s)[+-]?0(?:b[01]+|o[0-7]+|d\d+|x[\dA-F]+)(?=\s|$)/i,
				lookbehind: true
			},
			{
				// fractional ratios 1/5 -1/5 and the literal float approximations 1/5. -1/5.
				pattern: /(^|\s)[+-]?\d+\/\d+\.?(?=\s|$)/,
				lookbehind: true
			},
			{
				// positive mixed numbers 23+1/5 +23+1/5
				pattern: /(^|\s)\+?\d+\+\d+\/\d+(?=\s|$)/,
				lookbehind: true
			},
			{
				// negative mixed numbers -23-1/5
				pattern: /(^|\s)-\d+-\d+\/\d+(?=\s|$)/,
				lookbehind: true
			},
			{
				// basic decimal floats -0.01 0. .0 .1 -.1 -1. -12.13 +12.13
				// and scientific notation with base 10 exponents 3e4 3e-4 .3e-4
				pattern: /(^|\s)[+-]?(?:\d*\.\d+|\d+\.\d*|\d+)(?:e[+-]?\d+)?(?=\s|$)/i,
				lookbehind: true
			},
			{
				// NAN literal syntax NAN: 80000deadbeef, NAN: a
				pattern: /(^|\s)NAN:\s+[\da-fA-F]+(?=\s|$)/,
				lookbehind: true
			},
			{
				/*
					base prefix floats 0x1.0p3 (8.0) 0b1.010p2 (5.0) 0x1.p1 0b1.11111111p11111...
					"The normalized hex form ±0x1.MMMMMMMMMMMMM[pP]±EEEE allows any floating-point number to be specified precisely.
					The values of MMMMMMMMMMMMM and EEEE map directly to the mantissa and exponent fields of the binary IEEE 754 representation."
					<https://docs.factorcode.org/content/article-syntax-floats.html>
				*/
				pattern: /(^|\s)[+-]?0(?:b1\.[01]*|o1\.[0-7]*|d1\.\d*|x1\.[\dA-F]*)p\d+(?=\s|$)/i,
				lookbehind: true
			}
		],

		// R/ regexp?\/\\/
		'regexp': {
			pattern: /(^|\s)R\/\s(?:\\\S|[^\\/])*\/(?:[idmsr]*|[idmsr]+-[idmsr]+)(?=\s|$)/,
			lookbehind: true,
			alias: 'number',
			inside: {
				'variable': /\\\S/,
				'keyword': /[+?*\[\]^$(){}.|]/,
				'operator': {
					pattern: /(\/)[idmsr]+(?:-[idmsr]+)?/,
					lookbehind: true
				}
			}
		},

		'boolean': {
			pattern: /(^|\s)[tf](?=\s|$)/,
			lookbehind: true
		},

		// SBUF" asd", URL" ://...", P" /etc/"
		'custom-string': {
			pattern: /(^|\s)[A-Z0-9\-]+"\s(?:\\\S|[^"\\])*"/,
			lookbehind: true,
			greedy: true,
			alias: 'string',
			inside: {
				'number': /\\\S|%\w|\//
			}
		},

		'multiline-string': [
			{
				// STRING: name \n content \n ; -> CONSTANT: name "content" (symbol)
				pattern: /(^|\s)STRING:\s+\S+(?:\n|\r\n).*(?:\n|\r\n)\s*;(?=\s|$)/,
				lookbehind: true,
				greedy: true,
				alias: 'string',
				inside: {
					'number': string_inside.number,
					// trailing semicolon on its own line
					'semicolon-or-setlocal': {
						pattern: /([\r\n][ \t]*);(?=\s|$)/,
						lookbehind: true,
						alias: 'function'
					}
				}
			},
			{
				// HEREDOC: marker \n content \n marker ; -> "content" (immediate)
				pattern: /(^|\s)HEREDOC:\s+\S+(?:\n|\r\n).*(?:\n|\r\n)\s*\S+(?=\s|$)/,
				lookbehind: true,
				greedy: true,
				alias: 'string',
				inside: string_inside
			},
			{
				// [[ string ]], [==[ string]==]
				pattern: /(^|\s)\[(={0,6})\[\s[\s\S]*?\]\2\](?=\s|$)/,
				lookbehind: true,
				greedy: true,
				alias: 'string',
				inside: string_inside
			}
		],

		'special-using': {
			pattern: /(^|\s)USING:(?:\s\S+)*(?=\s+;(?:\s|$))/,
			lookbehind: true,
			alias: 'function',
			inside: {
				// this is essentially a regex for vocab names, which i don't want to specify
				// but the USING: gets picked up as a vocab name
				'string': {
					pattern: /(\s)[^:\s]+/,
					lookbehind: true
				}
			}
		},

		/* this description of stack effect literal syntax is not complete and not as specific as theoretically possible
			trying to do better is more work and regex-computation-time than it's worth though.
			- we'd like to have the "delimiter" parts of the stack effect [ (, --, and ) ] be a different (less-important or comment-like) colour to the stack effect contents
			- we'd like if nested stack effects were treated as such rather than just appearing flat (with `inside`)
			- we'd like if the following variable name conventions were recognised specifically:
				special row variables = ..a b..
				type and stack effect annotations end with a colon = ( quot: ( a: ( -- ) -- b ) -- x ), ( x: number -- )
				word throws unconditional error = *
				any other word-like variable name = a ? q' etc

			https://docs.factorcode.org/content/article-effects.html

			these are pretty complicated to highlight properly without a real parser, and therefore out of scope
			the old pattern, which may be later useful, was: (^|\s)(?:call|execute|eval)?\((?:\s+[^"\r\n\t ]\S*)*?\s+--(?:\s+[^"\n\t ]\S*)*?\s+\)(?=\s|$)
		*/

		// current solution is not great
		'stack-effect-delimiter': [
			{
				// opening parenthesis
				pattern: /(^|\s)(?:call|eval|execute)?\((?=\s)/,
				lookbehind: true,
				alias: 'operator'
			},
			{
				// middle --
				pattern: /(\s)--(?=\s)/,
				lookbehind: true,
				alias: 'operator'
			},
			{
				// closing parenthesis
				pattern: /(\s)\)(?=\s|$)/,
				lookbehind: true,
				alias: 'operator'
			}
		],

		'combinators': {
			pattern: null,
			lookbehind: true,
			alias: 'keyword'
		},

		'kernel-builtin': {
			pattern: null,
			lookbehind: true,
			alias: 'variable'
		},

		'sequences-builtin': {
			pattern: null,
			lookbehind: true,
			alias: 'variable'
		},

		'math-builtin': {
			pattern: null,
			lookbehind: true,
			alias: 'variable'
		},

		'constructor-word': {
			// <array> but not <=>
			pattern: /(^|\s)<(?!=+>|-+>)\S+>(?=\s|$)/,
			lookbehind: true,
			alias: 'keyword'
		},

		'other-builtin-syntax': {
			pattern: null,
			lookbehind: true,
			alias: 'operator'
		},

		/*
			full list of supported word naming conventions: (the convention appears outside of the [brackets])
				set-[x]
				change-[x]
				with-[x]
				new-[x]
				>[string]
				[base]>
				[string]>[number]
				+[symbol]+
				[boolean-word]?
				?[of]
				[slot-reader]>>
				>>[slot-setter]
				[slot-writer]<<
				([implementation-detail])
				[mutater]!
				[variant]*
				[prettyprint].
				$[help-markup]

			<constructors>, SYNTAX:, etc are supported by their own patterns.

			`with` and `new` from `kernel` are their own builtins.

			see <https://docs.factorcode.org/content/article-conventions.html>
		*/
		'conventionally-named-word': {
			pattern: /(^|\s)(?!")(?:(?:change|new|set|with)-\S+|\$\S+|>[^>\s]+|[^:>\s]+>|[^>\s]+>[^>\s]+|\+[^+\s]+\+|[^?\s]+\?|\?[^?\s]+|[^>\s]+>>|>>[^>\s]+|[^<\s]+<<|\([^()\s]+\)|[^!\s]+!|[^*\s]\S*\*|[^.\s]\S*\.)(?=\s|$)/,
			lookbehind: true,
			alias: 'keyword'
		},

		'colon-syntax': {
			pattern: /(^|\s)(?:[A-Z0-9\-]+#?)?:{1,2}\s+(?:;\S+|(?!;)\S+)(?=\s|$)/,
			lookbehind: true,
			greedy: true,
			alias: 'function'
		},

		'semicolon-or-setlocal': {
			pattern: /(\s)(?:;|:>)(?=\s|$)/,
			lookbehind: true,
			alias: 'function'
		},

		// do not highlight leading } or trailing X{ at the begin/end of the file as it's invalid syntax
		'curly-brace-literal-delimiter': [
			{
				// opening
				pattern: /(^|\s)[a-z]*\{(?=\s)/i,
				lookbehind: true,
				alias: 'operator'
			},
			{
				// closing
				pattern: /(\s)\}(?=\s|$)/,
				lookbehind: true,
				alias: 'operator'
			},

		],

		// do not highlight leading ] or trailing [ at the begin/end of the file as it's invalid syntax
		'quotation-delimiter': [
			{
				// opening
				pattern: /(^|\s)\[(?=\s)/,
				lookbehind: true,
				alias: 'operator'
			},
			{
				// closing
				pattern: /(\s)\](?=\s|$)/,
				lookbehind: true,
				alias: 'operator'
			},
		],

		'normal-word': {
			pattern: /(^|\s)[^"\s]\S*(?=\s|$)/,
			lookbehind: true
		},

		/*
			basic first-class string "a"
				with escaped double-quote "a\""
				escaped backslash "\\"
				and general escapes since Factor has so many "\N"

			syntax that works in the reference implementation that isn't fully
			supported because it's an implementation detail:
				"string 1""string 2" -> 2 strings (works anyway)
				"string"5 -> string, 5
				"string"[ ] -> string, quotation
				{ "a"} -> array<string>

			the rest of those examples all properly recognise the string, but not
				the other object (number, quotation, etc)
			this is fine for a regex-only implementation.
		*/
		'string': {
			pattern: /"(?:\\\S|[^"\\])*"/,
			greedy: true,
			inside: string_inside
		}
	};

	var escape = function (str) {
		return (str + '').replace(/([.?*+\^$\[\]\\(){}|\-])/g, '\\$1');
	};

	var arrToWordsRegExp = function (arr) {
		return new RegExp(
			'(^|\\s)(?:' + arr.map(escape).join('|') + ')(?=\\s|$)'
		);
	};

	var builtins = {
		'kernel-builtin': [
			'or', '2nipd', '4drop', 'tuck', 'wrapper', 'nip', 'wrapper?', 'callstack>array', 'die', 'dupd', 'callstack', 'callstack?', '3dup', 'hashcode', 'pick', '4nip', 'build', '>boolean', 'nipd', 'clone', '5nip', 'eq?', '?', '=', 'swapd', '2over', 'clear', '2dup', 'get-retainstack', 'not', 'tuple?', 'dup', '3nipd', 'call', '-rotd', 'object', 'drop', 'assert=', 'assert?', '-rot', 'execute', 'boa', 'get-callstack', 'curried?', '3drop', 'pickd', 'overd', 'over', 'roll', '3nip', 'swap', 'and', '2nip', 'rotd', 'throw', '(clone)', 'hashcode*', 'spin', 'reach', '4dup', 'equal?', 'get-datastack', 'assert', '2drop', '<wrapper>', 'boolean?', 'identity-hashcode', 'identity-tuple?', 'null', 'composed?', 'new', '5drop', 'rot', '-roll', 'xor', 'identity-tuple', 'boolean'
		],
		'other-builtin-syntax': [
			// syntax
			'=======', 'recursive', 'flushable', '>>', '<<<<<<', 'M\\', 'B', 'PRIVATE>', '\\', '======', 'final', 'inline', 'delimiter', 'deprecated', '<PRIVATE', '>>>>>>', '<<<<<<<', 'parse-complex', 'malformed-complex', 'read-only', '>>>>>>>', 'call-next-method', '<<', 'foldable',
			// literals
			'$', '$[', '${'
		],
		'sequences-builtin': [
			'member-eq?', 'mismatch', 'append', 'assert-sequence=', 'longer', 'repetition', 'clone-like', '3sequence', 'assert-sequence?', 'last-index-from', 'reversed', 'index-from', 'cut*', 'pad-tail', 'join-as', 'remove-eq!', 'concat-as', 'but-last', 'snip', 'nths', 'nth', 'sequence', 'longest', 'slice?', '<slice>', 'remove-nth', 'tail-slice', 'empty?', 'tail*', 'member?', 'virtual-sequence?', 'set-length', 'drop-prefix', 'iota', 'unclip', 'bounds-error?', 'unclip-last-slice', 'non-negative-integer-expected', 'non-negative-integer-expected?', 'midpoint@', 'longer?', '?set-nth', '?first', 'rest-slice', 'prepend-as', 'prepend', 'fourth', 'sift', 'subseq-start', 'new-sequence', '?last', 'like', 'first4', '1sequence', 'reverse', 'slice', 'virtual@', 'repetition?', 'set-last', 'index', '4sequence', 'max-length', 'set-second', 'immutable-sequence', 'first2', 'first3', 'supremum', 'unclip-slice', 'suffix!', 'insert-nth', 'tail', '3append', 'short', 'suffix', 'concat', 'flip', 'immutable?', 'reverse!', '2sequence', 'sum', 'delete-all', 'indices', 'snip-slice', '<iota>', 'check-slice', 'sequence?', 'head', 'append-as', 'halves', 'sequence=', 'collapse-slice', '?second', 'slice-error?', 'product', 'bounds-check?', 'bounds-check', 'immutable', 'virtual-exemplar', 'harvest', 'remove', 'pad-head', 'last', 'set-fourth', 'cartesian-product', 'remove-eq', 'shorten', 'shorter', 'reversed?', 'shorter?', 'shortest', 'head-slice', 'pop*', 'tail-slice*', 'but-last-slice', 'iota?', 'append!', 'cut-slice', 'new-resizable', 'head-slice*', 'sequence-hashcode', 'pop', 'set-nth', '?nth', 'second', 'join', 'immutable-sequence?', '<reversed>', '3append-as', 'virtual-sequence', 'subseq?', 'remove-nth!', 'length', 'last-index', 'lengthen', 'assert-sequence', 'copy', 'move', 'third', 'first', 'tail?', 'set-first', 'prefix', 'bounds-error', '<repetition>', 'exchange', 'surround', 'cut', 'min-length', 'set-third', 'push-all', 'head?', 'subseq-start-from', 'delete-slice', 'rest', 'sum-lengths', 'head*', 'infimum', 'remove!', 'glue', 'slice-error', 'subseq', 'push', 'replace-slice', 'subseq-as', 'unclip-last'
		],
		'math-builtin': [
			'number=', 'next-power-of-2', '?1+', 'fp-special?', 'imaginary-part', 'float>bits', 'number?', 'fp-infinity?', 'bignum?', 'fp-snan?', 'denominator', 'gcd', '*', '+', 'fp-bitwise=', '-', 'u>=', '/', '>=', 'bitand', 'power-of-2?', 'log2-expects-positive', 'neg?', '<', 'log2', '>', 'integer?', 'number', 'bits>double', '2/', 'zero?', 'bits>float', 'float?', 'shift', 'ratio?', 'rect>', 'even?', 'ratio', 'fp-sign', 'bitnot', '>fixnum', 'complex?', '/i', 'integer>fixnum', '/f', 'sgn', '>bignum', 'next-float', 'u<', 'u>', 'mod', 'recip', 'rational', '>float', '2^', 'integer', 'fixnum?', 'neg', 'fixnum', 'sq', 'bignum', '>rect', 'bit?', 'fp-qnan?', 'simple-gcd', 'complex', '<fp-nan>', 'real', '>fraction', 'double>bits', 'bitor', 'rem', 'fp-nan-payload', 'real-part', 'log2-expects-positive?', 'prev-float', 'align', 'unordered?', 'float', 'fp-nan?', 'abs', 'bitxor', 'integer>fixnum-strict', 'u<=', 'odd?', '<=', '/mod', '>integer', 'real?', 'rational?', 'numerator'
		]
		// that's all for now
	};

	Object.keys(builtins).forEach(function (k) {
		factor[k].pattern = arrToWordsRegExp(builtins[k]);
	});

	var combinators = [
		// kernel
		'2bi', 'while', '2tri', 'bi*', '4dip', 'both?', 'same?', 'tri@', 'curry', 'prepose', '3bi', '?if', 'tri*', '2keep', '3keep', 'curried', '2keepd', 'when', '2bi*', '2tri*', '4keep', 'bi@', 'keepdd', 'do', 'unless*', 'tri-curry', 'if*', 'loop', 'bi-curry*', 'when*', '2bi@', '2tri@', 'with', '2with', 'either?', 'bi', 'until', '3dip', '3curry', 'tri-curry*', 'tri-curry@', 'bi-curry', 'keepd', 'compose', '2dip', 'if', '3tri', 'unless', 'tuple', 'keep', '2curry', 'tri', 'most', 'while*', 'dip', 'composed', 'bi-curry@',
		// sequences
		'find-last-from', 'trim-head-slice', 'map-as', 'each-from', 'none?', 'trim-tail', 'partition', 'if-empty', 'accumulate*', 'reject!', 'find-from', 'accumulate-as', 'collector-for-as', 'reject', 'map', 'map-sum', 'accumulate!', '2each-from', 'follow', 'supremum-by', 'map!', 'unless-empty', 'collector', 'padding', 'reduce-index', 'replicate-as', 'infimum-by', 'trim-tail-slice', 'count', 'find-index', 'filter', 'accumulate*!', 'reject-as', 'map-integers', 'map-find', 'reduce', 'selector', 'interleave', '2map', 'filter-as', 'binary-reduce', 'map-index-as', 'find', 'produce', 'filter!', 'replicate', 'cartesian-map', 'cartesian-each', 'find-index-from', 'map-find-last', '3map-as', '3map', 'find-last', 'selector-as', '2map-as', '2map-reduce', 'accumulate', 'each', 'each-index', 'accumulate*-as', 'when-empty', 'all?', 'collector-as', 'push-either', 'new-like', 'collector-for', '2selector', 'push-if', '2all?', 'map-reduce', '3each', 'any?', 'trim-slice', '2reduce', 'change-nth', 'produce-as', '2each', 'trim', 'trim-head', 'cartesian-find', 'map-index',
		// math
		'if-zero', 'each-integer', 'unless-zero', '(find-integer)', 'when-zero', 'find-last-integer', '(all-integers?)', 'times', '(each-integer)', 'find-integer', 'all-integers?',
		// math.combinators
		'unless-negative', 'if-positive', 'when-positive', 'when-negative', 'unless-positive', 'if-negative',
		// combinators
		'case', '2cleave', 'cond>quot', 'case>quot', '3cleave', 'wrong-values', 'to-fixed-point', 'alist>quot', 'cond', 'cleave', 'call-effect', 'recursive-hashcode', 'spread', 'deep-spread>quot',
		// combinators.short-circuit
		'2||', '0||', 'n||', '0&&', '2&&', '3||', '1||', '1&&', 'n&&', '3&&',
		// combinators.smart
		'smart-unless*', 'keep-inputs', 'reduce-outputs', 'smart-when*', 'cleave>array', 'smart-with', 'smart-apply', 'smart-if', 'inputs/outputs', 'output>sequence-n', 'map-outputs', 'map-reduce-outputs', 'dropping', 'output>array', 'smart-map-reduce', 'smart-2map-reduce', 'output>array-n', 'nullary', 'input<sequence', 'append-outputs', 'drop-inputs', 'inputs', 'smart-2reduce', 'drop-outputs', 'smart-reduce', 'preserving', 'smart-when', 'outputs', 'append-outputs-as', 'smart-unless', 'smart-if*', 'sum-outputs', 'input<sequence-unsafe', 'output>sequence',
		// tafn
	];

	factor.combinators.pattern = arrToWordsRegExp(combinators);

	Prism.languages.factor = factor;

}(Prism));