gleam.js

// Up to date as of Gleam v1.6.3
Prism.languages.gleam = {
	comment: {
		pattern: /\/\/\/?.*/,
		greedy: true,
	},

	tag: /@(deprecated|external|internal)/,

	target: {
		pattern: /\b(erlang|javascript)\b/,
		alias: "symbol",
	},

	function: /\b(?<!@)([a-z_][a-z0-9_]+)(?=\()/,

	// Keyword list taken from https://github.com/gleam-lang/gleam/blob/v1.6.3/compiler-core/src/parse/lexer.rs#L23
	keyword:
		/\b(as|assert|auto|case|const|delegate|derive|echo|else|fn|if|implement|import|let|macro|opaque|panic|pub|test|todo|type|use)\b/,

	number:
		/\b(?:\d[\d_]*(\\.[\d_]*(e-?[\d_]+)?)?|0[bB][01_]+|0[oO][0-7_]+|0[xX][\da-fA-F_]+)\b/,

	type: {
		pattern: /(?:[A-Z][A-Za-z0-9_]+)/,
		greedy: true,
		alias: "symbol",
	},

	namespace: {
		pattern: /(?:[a-z][a-z0-9_]*)\.(?!{)/,
		inside: {
			punctuation: /\./,
		},
	},

	punctuation: /[:!,{}()\[\]]/,

	operator: {
		pattern:
			/(<<|>>|<-|->|\|>|<>|\.\.|<=\.?|>=\.?|==\.?|!=\.?|<\.?|>\.?|&&|\|\||\+\.?|-\.?|\/\.?|\*\.?|%|=|\|)/,
		greedy: true,
	},

	boolean: /\b(?:True|False|Ok|Error|Nil)\b/,

	string: {
		pattern: /"[\s\S]*?(?<!\\)"/,
		inside: {
			punctuation: /\\./,
		},
		greedy: true,
	},
};