prismjs/components/prism-rust.js

(function (Prism) {

	var multilineComment = /\/\*(?:[^*/]|\*(?!\/)|\/(?!\*)|<self>)*\*\//.source;
	for (var i = 0; i < 2; i++) {
		// support 4 levels of nested comments
		multilineComment = multilineComment.replace(/<self>/g, function () { return multilineComment; });
	}
	multilineComment = multilineComment.replace(/<self>/g, function () { return /[^\s\S]/.source; });


	Prism.languages.rust = {
		'comment': [
			{
				pattern: RegExp(/(^|[^\\])/.source + multilineComment),
				lookbehind: true,
				greedy: true
			},
			{
				pattern: /(^|[^\\:])\/\/.*/,
				lookbehind: true,
				greedy: true
			}
		],
		'string': {
			pattern: /b?"(?:\\[\s\S]|[^\\"])*"|b?r(#*)"(?:[^"]|"(?!\1))*"\1/,
			greedy: true
		},
		'char': {
			pattern: /b?'(?:\\(?:x[0-7][\da-fA-F]|u\{(?:[\da-fA-F]_*){1,6}\}|.)|[^\\\r\n\t'])'/,
			greedy: true,
			alias: 'string'
		},
		'attribute': {
			pattern: /#!?\[(?:[^\[\]"]|"(?:\\[\s\S]|[^\\"])*")*\]/,
			greedy: true,
			alias: 'attr-name',
			inside: {
				'string': null // see below
			}
		},

		// Closure params should not be confused with bitwise OR |
		'closure-params': {
			pattern: /([=(,:]\s*|\bmove\s*)\|[^|]*\||\|[^|]*\|(?=\s*(?:\{|->))/,
			lookbehind: true,
			greedy: true,
			inside: {
				'closure-punctuation': {
					pattern: /^\||\|$/,
					alias: 'punctuation'
				},
				rest: null // see below
			}
		},

		'lifetime-annotation': {
			pattern: /'\w+/,
			alias: 'symbol'
		},

		'fragment-specifier': {
			pattern: /(\$\w+:)[a-z]+/,
			lookbehind: true,
			alias: 'punctuation'
		},
		'variable': /\$\w+/,

		'function-definition': {
			pattern: /(\bfn\s+)\w+/,
			lookbehind: true,
			alias: 'function'
		},
		'type-definition': {
			pattern: /(\b(?:enum|struct|union)\s+)\w+/,
			lookbehind: true,
			alias: 'class-name'
		},
		'module-declaration': [
			{
				pattern: /(\b(?:crate|mod)\s+)[a-z][a-z_\d]*/,
				lookbehind: true,
				alias: 'namespace'
			},
			{
				pattern: /(\b(?:crate|self|super)\s*)::\s*[a-z][a-z_\d]*\b(?:\s*::(?:\s*[a-z][a-z_\d]*\s*::)*)?/,
				lookbehind: true,
				alias: 'namespace',
				inside: {
					'punctuation': /::/
				}
			}
		],
		'keyword': [
			// https://github.com/rust-lang/reference/blob/master/src/keywords.md
			/\b(?:abstract|as|async|await|become|box|break|const|continue|crate|do|dyn|else|enum|extern|final|fn|for|if|impl|in|let|loop|macro|match|mod|move|mut|override|priv|pub|ref|return|self|Self|static|struct|super|trait|try|type|typeof|union|unsafe|unsized|use|virtual|where|while|yield)\b/,
			// primitives and str
			// https://doc.rust-lang.org/stable/rust-by-example/primitives.html
			/\b(?:[ui](?:8|16|32|64|128|size)|f(?:32|64)|bool|char|str)\b/
		],

		// functions can technically start with an upper-case letter, but this will introduce a lot of false positives
		// and Rust's naming conventions recommend snake_case anyway.
		// https://doc.rust-lang.org/1.0.0/style/style/naming/README.html
		'function': /\b[a-z_]\w*(?=\s*(?:::\s*<|\())/,
		'macro': {
			pattern: /\b\w+!/,
			alias: 'property'
		},
		'constant': /\b[A-Z_][A-Z_\d]+\b/,
		'class-name': /\b[A-Z]\w*\b/,

		'namespace': {
			pattern: /(?:\b[a-z][a-z_\d]*\s*::\s*)*\b[a-z][a-z_\d]*\s*::(?!\s*<)/,
			inside: {
				'punctuation': /::/
			}
		},

		// Hex, oct, bin, dec numbers with visual separators and type suffix
		'number': /\b(?:0x[\dA-Fa-f](?:_?[\dA-Fa-f])*|0o[0-7](?:_?[0-7])*|0b[01](?:_?[01])*|(?:(?:\d(?:_?\d)*)?\.)?\d(?:_?\d)*(?:[Ee][+-]?\d+)?)(?:_?(?:[iu](?:8|16|32|64|size)?|f32|f64))?\b/,
		'boolean': /\b(?:false|true)\b/,
		'punctuation': /->|\.\.=|\.{1,3}|::|[{}[\];(),:]/,
		'operator': /[-+*\/%!^]=?|=[=>]?|&[&=]?|\|[|=]?|<<?=?|>>?=?|[@?]/
	};

	Prism.languages.rust['closure-params'].inside.rest = Prism.languages.rust;
	Prism.languages.rust['attribute'].inside['string'] = Prism.languages.rust['string'];

}(Prism));