Haskell: Regexp simplification + don't use captures if not needed

Author: Golmote

components/prism-haskell.js

@@ -1,35 +1,36 @@
 Prism.languages.haskell= {
 	'comment': {
-		pattern: /(^|[^-!#$%*+=?&@|~.:<>^\\\/])(--[^-!#$%*+=?&@|~.:<>^\\\/].*|{-[\s\S]*?-})/m,
+		pattern: /(^|[^-!#$%*+=?&@|~.:<>^\\\/])(?:--[^-!#$%*+=?&@|~.:<>^\\\/].*|{-[\s\S]*?-})/m,
 		lookbehind: true
 	},
-	'char': /'([^\\']|\\([abfnrtv\\"'&]|\^[A-Z@[\]\^_]|NUL|SOH|STX|ETX|EOT|ENQ|ACK|BEL|BS|HT|LF|VT|FF|CR|SO|SI|DLE|DC1|DC2|DC3|DC4|NAK|SYN|ETB|CAN|EM|SUB|ESC|FS|GS|RS|US|SP|DEL|\d+|o[0-7]+|x[0-9a-fA-F]+))'/,
+	'char': /'(?:[^\\']|\\(?:[abfnrtv\\"'&]|\^[A-Z@[\]^_]|NUL|SOH|STX|ETX|EOT|ENQ|ACK|BEL|BS|HT|LF|VT|FF|CR|SO|SI|DLE|DC1|DC2|DC3|DC4|NAK|SYN|ETB|CAN|EM|SUB|ESC|FS|GS|RS|US|SP|DEL|\d+|o[0-7]+|x[0-9a-fA-F]+))'/,
 	'string': {
-		pattern: /"([^\\"]|\\([abfnrtv\\"'&]|\^[A-Z@[\]\^_]|NUL|SOH|STX|ETX|EOT|ENQ|ACK|BEL|BS|HT|LF|VT|FF|CR|SO|SI|DLE|DC1|DC2|DC3|DC4|NAK|SYN|ETB|CAN|EM|SUB|ESC|FS|GS|RS|US|SP|DEL|\d+|o[0-7]+|x[0-9a-fA-F]+)|\\\s+\\)*"/,
+		pattern: /"(?:[^\\"]|\\(?:[abfnrtv\\"'&]|\^[A-Z@[\]^_]|NUL|SOH|STX|ETX|EOT|ENQ|ACK|BEL|BS|HT|LF|VT|FF|CR|SO|SI|DLE|DC1|DC2|DC3|DC4|NAK|SYN|ETB|CAN|EM|SUB|ESC|FS|GS|RS|US|SP|DEL|\d+|o[0-7]+|x[0-9a-fA-F]+)|\\\s+\\)*"/,
 		greedy: true
 	},
-	'keyword' : /\b(case|class|data|deriving|do|else|if|in|infixl|infixr|instance|let|module|newtype|of|primitive|then|type|where)\b/,
+	'keyword' : /\b(?:case|class|data|deriving|do|else|if|in|infixl|infixr|instance|let|module|newtype|of|primitive|then|type|where)\b/,
 	'import_statement' : {
 		// The imported or hidden names are not included in this import
 		// statement. This is because we want to highlight those exactly like
 		// we do for the names in the program.
-		pattern: /(\r?\n|\r|^)\s*import\s+(qualified\s+)?([A-Z][_a-zA-Z0-9']*)(\.[A-Z][_a-zA-Z0-9']*)*(\s+as\s+([A-Z][_a-zA-Z0-9']*)(\.[A-Z][_a-zA-Z0-9']*)*)?(\s+hiding\b)?/m,
+		pattern: /((?:\r?\n|\r|^)\s*)import\s+(?:qualified\s+)?(?:[A-Z][\w']*)(?:\.[A-Z][\w']*)*(?:\s+as\s+(?:[A-Z][_a-zA-Z0-9']*)(?:\.[A-Z][\w']*)*)?(?:\s+hiding\b)?/m,
+		lookbehind: true,
 		inside: {
-			'keyword': /\b(import|qualified|as|hiding)\b/
+			'keyword': /\b(?:import|qualified|as|hiding)\b/
 		}
 	},
 	// These are builtin variables only. Constructors are highlighted later as a constant.
-	'builtin': /\b(abs|acos|acosh|all|and|any|appendFile|approxRational|asTypeOf|asin|asinh|atan|atan2|atanh|basicIORun|break|catch|ceiling|chr|compare|concat|concatMap|const|cos|cosh|curry|cycle|decodeFloat|denominator|digitToInt|div|divMod|drop|dropWhile|either|elem|encodeFloat|enumFrom|enumFromThen|enumFromThenTo|enumFromTo|error|even|exp|exponent|fail|filter|flip|floatDigits|floatRadix|floatRange|floor|fmap|foldl|foldl1|foldr|foldr1|fromDouble|fromEnum|fromInt|fromInteger|fromIntegral|fromRational|fst|gcd|getChar|getContents|getLine|group|head|id|inRange|index|init|intToDigit|interact|ioError|isAlpha|isAlphaNum|isAscii|isControl|isDenormalized|isDigit|isHexDigit|isIEEE|isInfinite|isLower|isNaN|isNegativeZero|isOctDigit|isPrint|isSpace|isUpper|iterate|last|lcm|length|lex|lexDigits|lexLitChar|lines|log|logBase|lookup|map|mapM|mapM_|max|maxBound|maximum|maybe|min|minBound|minimum|mod|negate|not|notElem|null|numerator|odd|or|ord|otherwise|pack|pi|pred|primExitWith|print|product|properFraction|putChar|putStr|putStrLn|quot|quotRem|range|rangeSize|read|readDec|readFile|readFloat|readHex|readIO|readInt|readList|readLitChar|readLn|readOct|readParen|readSigned|reads|readsPrec|realToFrac|recip|rem|repeat|replicate|return|reverse|round|scaleFloat|scanl|scanl1|scanr|scanr1|seq|sequence|sequence_|show|showChar|showInt|showList|showLitChar|showParen|showSigned|showString|shows|showsPrec|significand|signum|sin|sinh|snd|sort|span|splitAt|sqrt|subtract|succ|sum|tail|take|takeWhile|tan|tanh|threadToIOResult|toEnum|toInt|toInteger|toLower|toRational|toUpper|truncate|uncurry|undefined|unlines|until|unwords|unzip|unzip3|userError|words|writeFile|zip|zip3|zipWith|zipWith3)\b/,
+	'builtin': /\b(?:abs|acos|acosh|all|and|any|appendFile|approxRational|asTypeOf|asin|asinh|atan|atan2|atanh|basicIORun|break|catch|ceiling|chr|compare|concat|concatMap|const|cos|cosh|curry|cycle|decodeFloat|denominator|digitToInt|div|divMod|drop|dropWhile|either|elem|encodeFloat|enumFrom|enumFromThen|enumFromThenTo|enumFromTo|error|even|exp|exponent|fail|filter|flip|floatDigits|floatRadix|floatRange|floor|fmap|foldl|foldl1|foldr|foldr1|fromDouble|fromEnum|fromInt|fromInteger|fromIntegral|fromRational|fst|gcd|getChar|getContents|getLine|group|head|id|inRange|index|init|intToDigit|interact|ioError|isAlpha|isAlphaNum|isAscii|isControl|isDenormalized|isDigit|isHexDigit|isIEEE|isInfinite|isLower|isNaN|isNegativeZero|isOctDigit|isPrint|isSpace|isUpper|iterate|last|lcm|length|lex|lexDigits|lexLitChar|lines|log|logBase|lookup|map|mapM|mapM_|max|maxBound|maximum|maybe|min|minBound|minimum|mod|negate|not|notElem|null|numerator|odd|or|ord|otherwise|pack|pi|pred|primExitWith|print|product|properFraction|putChar|putStr|putStrLn|quot|quotRem|range|rangeSize|read|readDec|readFile|readFloat|readHex|readIO|readInt|readList|readLitChar|readLn|readOct|readParen|readSigned|reads|readsPrec|realToFrac|recip|rem|repeat|replicate|return|reverse|round|scaleFloat|scanl|scanl1|scanr|scanr1|seq|sequence|sequence_|show|showChar|showInt|showList|showLitChar|showParen|showSigned|showString|shows|showsPrec|significand|signum|sin|sinh|snd|sort|span|splitAt|sqrt|subtract|succ|sum|tail|take|takeWhile|tan|tanh|threadToIOResult|toEnum|toInt|toInteger|toLower|toRational|toUpper|truncate|uncurry|undefined|unlines|until|unwords|unzip|unzip3|userError|words|writeFile|zip|zip3|zipWith|zipWith3)\b/,
 	// decimal integers and floating point numbers | octal integers | hexadecimal integers
-	'number' : /\b(\d+(\.\d+)?(e[+-]?\d+)?|0o[0-7]+|0x[0-9a-f]+)\b/i,
+	'number' : /\b(?:\d+(?:\.\d+)?(?:e[+-]?\d+)?|0o[0-7]+|0x[0-9a-f]+)\b/i,
 	// Most of this is needed because of the meaning of a single '.'.
 	// If it stands alone freely, it is the function composition.
 	// It may also be a separator between a module name and an identifier => no
 	// operator. If it comes together with other special characters it is an
 	// operator too.
-	'operator' : /\s\.\s|[-!#$%*+=?&@|~.:<>^\\\/]*\.[-!#$%*+=?&@|~.:<>^\\\/]+|[-!#$%*+=?&@|~.:<>^\\\/]+\.[-!#$%*+=?&@|~.:<>^\\\/]*|[-!#$%*+=?&@|~:<>^\\\/]+|`([A-Z][_a-zA-Z0-9']*\.)*[_a-z][_a-zA-Z0-9']*`/,
+	'operator' : /\s\.\s|[-!#$%*+=?&@|~.:<>^\\\/]*\.[-!#$%*+=?&@|~.:<>^\\\/]+|[-!#$%*+=?&@|~.:<>^\\\/]+\.[-!#$%*+=?&@|~.:<>^\\\/]*|[-!#$%*+=?&@|~:<>^\\\/]+|`([A-Z][\w']*\.)*[_a-z][\w']*`/,
 	// In Haskell, nearly everything is a variable, do not highlight these.
-	'hvariable': /\b([A-Z][_a-zA-Z0-9']*\.)*[_a-z][_a-zA-Z0-9']*\b/,
-	'constant': /\b([A-Z][_a-zA-Z0-9']*\.)*[A-Z][_a-zA-Z0-9']*\b/,
+	'hvariable': /\b(?:[A-Z][\w']*\.)*[_a-z][\w']*\b/,
+	'constant': /\b(?:[A-Z][\w']*\.)*[A-Z][\w']*\b/,
 	'punctuation' : /[{}[\];(),.:]/
 };