GitFOSS

(function (Prism) {
	// We don't allow for pipes inside parentheses
	// to not break table pattern |(. foo |). bar |
	var modifierRegex = /\([^|()\n]+\)|\[[^\]\n]+\]|\{[^}\n]+\}/.source;
	// Opening and closing parentheses which are not a modifier
	// This pattern is necessary to prevent exponential backtracking
	var parenthesesRegex = /\)|\((?![^|()\n]+\))/.source;
	/**
	 * @param {string} source
	 * @param {string} [flags]
	 */
	function withModifier(source, flags) {
		return RegExp(
			source
				.replace(/<MOD>/g, function () { return '(?:' + modifierRegex + ')'; })
				.replace(/<PAR>/g, function () { return '(?:' + parenthesesRegex + ')'; }),
			flags || '');
	}

	var modifierTokens = {
		'css': {
			pattern: /\{[^{}]+\}/,
			inside: {
				rest: Prism.languages.css
			}
		},
		'class-id': {
			pattern: /(\()[^()]+(?=\))/,
			lookbehind: true,
			alias: 'attr-value'
		},
		'lang': {
			pattern: /(\[)[^\[\]]+(?=\])/,
			lookbehind: true,
			alias: 'attr-value'
		},
		// Anything else is punctuation (the first pattern is for row/col spans inside tables)
		'punctuation': /[\\\/]\d+|\S/
	};


	var textile = Prism.languages.textile = Prism.languages.extend('markup', {
		'phrase': {
			pattern: /(^|\r|\n)\S[\s\S]*?(?=$|\r?\n\r?\n|\r\r)/,
			lookbehind: true,
			inside: {

				// h1. Header 1
				'block-tag': {
					pattern: withModifier(/^[a-z]\w*(?:<MOD>|<PAR>|[<>=])*\./.source),
					inside: {
						'modifier': {
							pattern: withModifier(/(^[a-z]\w*)(?:<MOD>|<PAR>|[<>=])+(?=\.)/.source),
							lookbehind: true,
							inside: modifierTokens
						},
						'tag': /^[a-z]\w*/,
						'punctuation': /\.$/
					}
				},

				// # List item
				// * List item
				'list': {
					pattern: withModifier(/^[*#]+<MOD>*\s+\S.*/.source, 'm'),
					inside: {
						'modifier': {
							pattern: withModifier(/(^[*#]+)<MOD>+/.source),
							lookbehind: true,
							inside: modifierTokens
						},
						'punctuation': /^[*#]+/
					}
				},

				// | cell | cell | cell |
				'table': {
					// Modifiers can be applied to the row: {color:red}.|1|2|3|
					// or the cell: |{color:red}.1|2|3|
					pattern: withModifier(/^(?:(?:<MOD>|<PAR>|[<>=^~])+\.\s*)?(?:\|(?:(?:<MOD>|<PAR>|[<>=^~_]|[\\/]\d+)+\.|(?!(?:<MOD>|<PAR>|[<>=^~_]|[\\/]\d+)+\.))[^|]*)+\|/.source, 'm'),
					inside: {
						'modifier': {
							// Modifiers for rows after the first one are
							// preceded by a pipe and a line feed
							pattern: withModifier(/(^|\|(?:\r?\n|\r)?)(?:<MOD>|<PAR>|[<>=^~_]|[\\/]\d+)+(?=\.)/.source),
							lookbehind: true,
							inside: modifierTokens
						},
						'punctuation': /\||^\./
					}
				},

				'inline': {
					// eslint-disable-next-line regexp/no-super-linear-backtracking
					pattern: withModifier(/(^|[^a-zA-Z\d])(\*\*|__|\?\?|[*_%@+\-^~])<MOD>*.+?\2(?![a-zA-Z\d])/.source),
					lookbehind: true,
					inside: {
						// Note: superscripts and subscripts are not handled specifically

						// *bold*, **bold**
						'bold': {
							// eslint-disable-next-line regexp/no-super-linear-backtracking
							pattern: withModifier(/(^(\*\*?)<MOD>*).+?(?=\2)/.source),
							lookbehind: true
						},

						// _italic_, __italic__
						'italic': {
							// eslint-disable-next-line regexp/no-super-linear-backtracking
							pattern: withModifier(/(^(__?)<MOD>*).+?(?=\2)/.source),
							lookbehind: true
						},

						// ??cite??
						'cite': {
							// eslint-disable-next-line regexp/no-super-linear-backtracking
							pattern: withModifier(/(^\?\?<MOD>*).+?(?=\?\?)/.source),
							lookbehind: true,
							alias: 'string'
						},

						// @code@
						'code': {
							// eslint-disable-next-line regexp/no-super-linear-backtracking
							pattern: withModifier(/(^@<MOD>*).+?(?=@)/.source),
							lookbehind: true,
							alias: 'keyword'
						},

						// +inserted+
						'inserted': {
							// eslint-disable-next-line regexp/no-super-linear-backtracking
							pattern: withModifier(/(^\+<MOD>*).+?(?=\+)/.source),
							lookbehind: true
						},

						// -deleted-
						'deleted': {
							// eslint-disable-next-line regexp/no-super-linear-backtracking
							pattern: withModifier(/(^-<MOD>*).+?(?=-)/.source),
							lookbehind: true
						},

						// %span%
						'span': {
							// eslint-disable-next-line regexp/no-super-linear-backtracking
							pattern: withModifier(/(^%<MOD>*).+?(?=%)/.source),
							lookbehind: true
						},

						'modifier': {
							pattern: withModifier(/(^\*\*|__|\?\?|[*_%@+\-^~])<MOD>+/.source),
							lookbehind: true,
							inside: modifierTokens
						},
						'punctuation': /[*_%?@+\-^~]+/
					}
				},

				// [alias]http://example.com
				'link-ref': {
					pattern: /^\[[^\]]+\]\S+$/m,
					inside: {
						'string': {
							pattern: /(^\[)[^\]]+(?=\])/,
							lookbehind: true
						},
						'url': {
							pattern: /(^\])\S+$/,
							lookbehind: true
						},
						'punctuation': /[\[\]]/
					}
				},

				// "text":http://example.com
				// "text":link-ref
				'link': {
					// eslint-disable-next-line regexp/no-super-linear-backtracking
					pattern: withModifier(/"<MOD>*[^"]+":.+?(?=[^\w/]?(?:\s|$))/.source),
					inside: {
						'text': {
							// eslint-disable-next-line regexp/no-super-linear-backtracking
							pattern: withModifier(/(^"<MOD>*)[^"]+(?=")/.source),
							lookbehind: true
						},
						'modifier': {
							pattern: withModifier(/(^")<MOD>+/.source),
							lookbehind: true,
							inside: modifierTokens
						},
						'url': {
							pattern: /(:).+/,
							lookbehind: true
						},
						'punctuation': /[":]/
					}
				},

				// !image.jpg!
				// !image.jpg(Title)!:http://example.com
				'image': {
					pattern: withModifier(/!(?:<MOD>|<PAR>|[<>=])*(?![<>=])[^!\s()]+(?:\([^)]+\))?!(?::.+?(?=[^\w/]?(?:\s|$)))?/.source),
					inside: {
						'source': {
							pattern: withModifier(/(^!(?:<MOD>|<PAR>|[<>=])*)(?![<>=])[^!\s()]+(?:\([^)]+\))?(?=!)/.source),
							lookbehind: true,
							alias: 'url'
						},
						'modifier': {
							pattern: withModifier(/(^!)(?:<MOD>|<PAR>|[<>=])+/.source),
							lookbehind: true,
							inside: modifierTokens
						},
						'url': {
							pattern: /(:).+/,
							lookbehind: true
						},
						'punctuation': /[!:]/
					}
				},

				// Footnote[1]
				'footnote': {
					pattern: /\b\[\d+\]/,
					alias: 'comment',
					inside: {
						'punctuation': /\[|\]/
					}
				},

				// CSS(Cascading Style Sheet)
				'acronym': {
					pattern: /\b[A-Z\d]+\([^)]+\)/,
					inside: {
						'comment': {
							pattern: /(\()[^()]+(?=\))/,
							lookbehind: true
						},
						'punctuation': /[()]/
					}
				},

				// Prism(C)
				'mark': {
					pattern: /\b\((?:C|R|TM)\)/,
					alias: 'comment',
					inside: {
						'punctuation': /[()]/
					}
				}
			}
		}
	});

	var phraseInside = textile['phrase'].inside;
	var nestedPatterns = {
		'inline': phraseInside['inline'],
		'link': phraseInside['link'],
		'image': phraseInside['image'],
		'footnote': phraseInside['footnote'],
		'acronym': phraseInside['acronym'],
		'mark': phraseInside['mark']
	};

	// Only allow alpha-numeric HTML tags, not XML tags
	textile.tag.pattern = /<\/?(?!\d)[a-z0-9]+(?:\s+[^\s>\/=]+(?:=(?:("|')(?:\\[\s\S]|(?!\1)[^\\])*\1|[^\s'">=]+))?)*\s*\/?>/i;

	// Allow some nesting
	var phraseInlineInside = phraseInside['inline'].inside;
	phraseInlineInside['bold'].inside = nestedPatterns;
	phraseInlineInside['italic'].inside = nestedPatterns;
	phraseInlineInside['inserted'].inside = nestedPatterns;
	phraseInlineInside['deleted'].inside = nestedPatterns;
	phraseInlineInside['span'].inside = nestedPatterns;

	// Allow some styles inside table cells
	var phraseTableInside = phraseInside['table'].inside;
	phraseTableInside['inline'] = nestedPatterns['inline'];
	phraseTableInside['link'] = nestedPatterns['link'];
	phraseTableInside['image'] = nestedPatterns['image'];
	phraseTableInside['footnote'] = nestedPatterns['footnote'];
	phraseTableInside['acronym'] = nestedPatterns['acronym'];
	phraseTableInside['mark'] = nestedPatterns['mark'];

}(Prism));