Add Perl syntax highlighting

assets/javascripts/vendor/prism.js

@@ -1,4 +1,4 @@
-/* http://prismjs.com/download.html?themes=prism&languages=markup+css+clike+javascript+c+cpp+coffeescript+ruby+elixir+go+lua+nginx+php+python+rust+typescript */
+/* http://prismjs.com/download.html?themes=prism&languages=markup+css+clike+javascript+c+cpp+coffeescript+ruby+elixir+go+lua+nginx+perl+php+python+rust+typescript */
 var _self = (typeof window !== 'undefined')
 	? window   // if in browser
 	: (
@@ -1034,6 +1034,147 @@ Prism.languages.nginx = Prism.languages.extend('clike', {
 Prism.languages.insertBefore('nginx', 'keyword', {
         'variable': /\$[a-z_]+/i
 });
+Prism.languages.perl = {
+	'comment': [
+		{
+			// POD
+			pattern: /(^\s*)=\w+[\s\S]*?=cut.*/m,
+			lookbehind: true
+		},
+		{
+			pattern: /(^|[^\\$])#.*/,
+			lookbehind: true
+		}
+	],
+	// TODO Could be nice to handle Heredoc too.
+	'string': [
+		// q/.../
+		/\b(?:q|qq|qx|qw)\s*([^a-zA-Z0-9\s\{\(\[<])(?:[^\\]|\\[\s\S])*?\1/,
+
+		// q a...a
+		/\b(?:q|qq|qx|qw)\s+([a-zA-Z0-9])(?:[^\\]|\\[\s\S])*?\1/,
+
+		// q(...)
+		/\b(?:q|qq|qx|qw)\s*\((?:[^()\\]|\\[\s\S])*\)/,
+
+		// q{...}
+		/\b(?:q|qq|qx|qw)\s*\{(?:[^{}\\]|\\[\s\S])*\}/,
+
+		// q[...]
+		/\b(?:q|qq|qx|qw)\s*\[(?:[^[\]\\]|\\[\s\S])*\]/,
+
+		// q<...>
+		/\b(?:q|qq|qx|qw)\s*<(?:[^<>\\]|\\[\s\S])*>/,
+
+		// "...", `...`
+		/("|`)(?:[^\\]|\\[\s\S])*?\1/,
+
+		// '...'
+		// FIXME Multi-line single-quoted strings are not supported as they would break variables containing '
+		/'(?:[^'\\\r\n]|\\.)*'/
+	],
+	'regex': [
+		// m/.../
+		/\b(?:m|qr)\s*([^a-zA-Z0-9\s\{\(\[<])(?:[^\\]|\\[\s\S])*?\1[msixpodualngc]*/,
+
+		// m a...a
+		/\b(?:m|qr)\s+([a-zA-Z0-9])(?:[^\\]|\\.)*?\1[msixpodualngc]*/,
+
+		// m(...)
+		/\b(?:m|qr)\s*\((?:[^()\\]|\\[\s\S])*\)[msixpodualngc]*/,
+
+		// m{...}
+		/\b(?:m|qr)\s*\{(?:[^{}\\]|\\[\s\S])*\}[msixpodualngc]*/,
+
+		// m[...]
+		/\b(?:m|qr)\s*\[(?:[^[\]\\]|\\[\s\S])*\][msixpodualngc]*/,
+
+		// m<...>
+		/\b(?:m|qr)\s*<(?:[^<>\\]|\\[\s\S])*>[msixpodualngc]*/,
+
+		// The lookbehinds prevent -s from breaking
+		// FIXME We don't handle change of separator like s(...)[...]
+		// s/.../.../
+		{
+			pattern: /(^|[^-]\b)(?:s|tr|y)\s*([^a-zA-Z0-9\s\{\(\[<])(?:[^\\]|\\[\s\S])*?\2(?:[^\\]|\\[\s\S])*?\2[msixpodualngcer]*/,
+			lookbehind: true
+		},
+
+		// s a...a...a
+		{
+			pattern: /(^|[^-]\b)(?:s|tr|y)\s+([a-zA-Z0-9])(?:[^\\]|\\[\s\S])*?\2(?:[^\\]|\\[\s\S])*?\2[msixpodualngcer]*/,
+			lookbehind: true
+		},
+
+		// s(...)(...)
+		{
+			pattern: /(^|[^-]\b)(?:s|tr|y)\s*\((?:[^()\\]|\\[\s\S])*\)\s*\((?:[^()\\]|\\[\s\S])*\)[msixpodualngcer]*/,
+			lookbehind: true
+		},
+
+		// s{...}{...}
+		{
+			pattern: /(^|[^-]\b)(?:s|tr|y)\s*\{(?:[^{}\\]|\\[\s\S])*\}\s*\{(?:[^{}\\]|\\[\s\S])*\}[msixpodualngcer]*/,
+			lookbehind: true
+		},
+
+		// s[...][...]
+		{
+			pattern: /(^|[^-]\b)(?:s|tr|y)\s*\[(?:[^[\]\\]|\\[\s\S])*\]\s*\[(?:[^[\]\\]|\\[\s\S])*\][msixpodualngcer]*/,
+			lookbehind: true
+		},
+
+		// s<...><...>
+		{
+			pattern: /(^|[^-]\b)(?:s|tr|y)\s*<(?:[^<>\\]|\\[\s\S])*>\s*<(?:[^<>\\]|\\[\s\S])*>[msixpodualngcer]*/,
+			lookbehind: true
+		},
+
+		// /.../
+		// The look-ahead tries to prevent two divisions on
+		// the same line from being highlighted as regex.
+		// This does not support multi-line regex.
+		/\/(?:[^\/\\\r\n]|\\.)*\/[msixpodualngc]*(?=\s*(?:$|[\r\n,.;})&|\-+*~<>!?^]|(lt|gt|le|ge|eq|ne|cmp|not|and|or|xor|x)\b))/
+	],
+
+	// FIXME Not sure about the handling of ::, ', and #
+	'variable': [
+		// ${^POSTMATCH}
+		/[&*$@%]\{\^[A-Z]+\}/,
+		// $^V
+		/[&*$@%]\^[A-Z_]/,
+		// ${...}
+		/[&*$@%]#?(?=\{)/,
+		// $foo
+		/[&*$@%]#?((::)*'?(?!\d)[\w$]+)+(::)*/i,
+		// $1
+		/[&*$@%]\d+/,
+		// $_, @_, %!
+		// The negative lookahead prevents from breaking the %= operator
+		/(?!%=)[$@%][!"#$%&'()*+,\-.\/:;<=>?@[\\\]^_`{|}~]/
+	],
+	'filehandle': {
+		// <>, <FOO>, _
+		pattern: /<(?![<=])\S*>|\b_\b/,
+		alias: 'symbol'
+	},
+	'vstring': {
+		// v1.2, 1.2.3
+		pattern: /v\d+(\.\d+)*|\d+(\.\d+){2,}/,
+		alias: 'string'
+	},
+	'function': {
+		pattern: /sub [a-z0-9_]+/i,
+		inside: {
+			keyword: /sub/
+		}
+	},
+	'keyword': /\b(any|break|continue|default|delete|die|do|else|elsif|eval|for|foreach|given|goto|if|last|local|my|next|our|package|print|redo|require|say|state|sub|switch|undef|unless|until|use|when|while)\b/,
+	'number': /\b-?(0x[\dA-Fa-f](_?[\dA-Fa-f])*|0b[01](_?[01])*|(\d(_?\d)*)?\.?\d(_?\d)*([Ee][+-]?\d+)?)\b/,
+	'operator': /-[rwxoRWXOezsfdlpSbctugkTBMAC]\b|\+[+=]?|-[-=>]?|\*\*?=?|\/\/?=?|=[=~>]?|~[~=]?|\|\|?=?|&&?=?|<(?:=>?|<=?)?|>>?=?|![~=]?|[%^]=?|\.(?:=|\.\.?)?|[\\?]|\bx(?:=|\b)|\b(lt|gt|le|ge|eq|ne|cmp|not|and|or|xor)\b/,
+	'punctuation': /[{}[\];(),:]/
+};
+
 /**
  * Original by Aaron Harun: http://aahacreative.com/2012/07/31/php-syntax-highlighting-prism/
  * Modified by Miles Johnson: http://milesj.me