Added support for CUE

components.json

@@ -330,6 +330,10 @@
 			"title": "CSV",
 			"owner": "RunDevelopment"
 		},
+		"cue": {
+			"title": "CUE",
+			"owner": "RunDevelopment"
+		},
 		"cypher": {
 			"title": "Cypher",
 			"owner": "RunDevelopment"

components/prism-cue.js

@@ -0,0 +1,84 @@
+(function (Prism) {
+
+	// https://cuelang.org/docs/references/spec/
+
+	// eslint-disable-next-line regexp/strict
+	var stringEscape = /\\(?:(?!\2)|\2(?:[^()\r\n]|\([^()]*\)))/.source;
+	// eslint-disable-next-line regexp/strict
+	var stringTypes = /"""(?:[^\\"]|"(?!""\2)|<esc>)*"""/.source +
+		// eslint-disable-next-line regexp/strict
+		'|' + /'''(?:[^\\']|'(?!''\2)|<esc>)*'''/.source +
+		// eslint-disable-next-line regexp/strict
+		'|' + /"(?:[^\\\r\n"]|"(?!\2)|<esc>)*"/.source +
+		// eslint-disable-next-line regexp/strict
+		'|' + /'(?:[^\\\r\n']|'(?!\2)|<esc>)*'/.source;
+	var stringLiteral = '(?:' + stringTypes.replace(/<esc>/g, stringEscape) + ')';
+
+	Prism.languages.cue = {
+		'comment': {
+			pattern: /\/\/.*/,
+			greedy: true
+		},
+		'string-literal': {
+			// eslint-disable-next-line regexp/strict
+			pattern: RegExp(/(^|[^#"'\\])(#*)/.source + stringLiteral + /(?!["'])\2/.source),
+			lookbehind: true,
+			greedy: true,
+			inside: {
+				// I'm using dirty hack here. We have to know the number hashes at the start of the string somehow,
+				// but we can't look back. So instead, we will use a lookahead, go to the end of the string, and
+				// capture the hashes at the end of the string.
+				'escape': {
+					pattern: /(?=[\s\S]*["'](#*)$)\\\1(?:U[a-fA-F0-9]{1,8}|u[a-fA-F0-9]{1,4}|x[a-fA-F0-9]{1,2}|\d{2,3}|[^(])/,
+					greedy: true,
+					alias: 'string'
+				},
+				'interpolation': {
+					pattern: /(?=[\s\S]*["'](#*)$)\\\1\([^()]*\)/,
+					greedy: true,
+					inside: {
+						'punctuation': /^\\#*\(|\)$/,
+						'expression': {
+							pattern: /[\s\S]+/,
+							inside: null
+						}
+					}
+				},
+				'string': /[\s\S]+/
+			}
+		},
+
+		'keyword': {
+			pattern: /(^|[^\w$])(?:for|if|import|in|let|null|package)(?![\w$])/,
+			lookbehind: true
+		},
+		'boolean': {
+			pattern: /(^|[^\w$])(?:false|true)(?![\w$])/,
+			lookbehind: true
+		},
+		'builtin': {
+			pattern: /(^|[^\w$])(?:bool|bytes|float|float(?:32|64)|u?int(?:8|16|32|64|128)?|number|rune|string)(?![\w$])/,
+			lookbehind: true
+		},
+
+		'attribute': {
+			pattern: /@[\w$]+(?=\s*\()/,
+			alias: 'function'
+		},
+		'function': {
+			pattern: /(^|[^\w$])[a-z_$][\w$]*(?=\s*\()/i,
+			lookbehind: true
+		},
+
+		'number': {
+			pattern: /(^|[^\w$.])(?:0b[01]+(?:_[01]+)*|0o[0-7]+(?:_[0-7]+)*|0[xX][0-9A-Fa-f]+(?:_[0-9A-Fa-f]+)*|(?:\d+(?:_\d+)*(?:\.(?:\d+(?:_\d+)*)?)?|\.\d+(?:_\d+)*)(?:[eE][+-]?\d+(?:_\d+)*)?(?:[KMGTP]i?)?)(?![\w$])/,
+			lookbehind: true
+		},
+
+		'operator': /\.{3}|_\|_|&&?|\|\|?|[=!]~|[<>=!]=?|[+\-*/?]/,
+		'punctuation': /[()[\]{},.:]/
+	};
+
+	Prism.languages.cue['string-literal'].inside.interpolation.inside.expression.inside = Prism.languages.cue;
+
+}(Prism));

examples/prism-cue.html

@@ -0,0 +1,23 @@
+<h2>Full example</h2>
+<pre><code>#Spec: {
+	kind: string
+
+	name: {
+		first:   !=""  // must be specified and non-empty
+		middle?: !=""  // optional, but must be non-empty when specified
+		last:    !=""
+	}
+
+	// The minimum must be strictly smaller than the maximum and vice versa.
+	minimum?: int & &lt;maximum
+	maximum?: int & >minimum
+}
+
+// A spec is of type #Spec
+spec: #Spec
+spec: {
+	knid: "Homo Sapiens" // error, misspelled field
+
+	name: first: "Jane"
+	name: last:  "Doe"
+}</code></pre>

plugins/show-language/prism-show-language.js

@@ -71,6 +71,7 @@
 		"csp": "Content-Security-Policy",
 		"css-extras": "CSS Extras",
 		"csv": "CSV",
+		"cue": "CUE",
 		"dataweave": "DataWeave",
 		"dax": "DAX",
 		"django": "Django/Jinja2",

tests/languages/cue/attribute_feature.test

@@ -0,0 +1,20 @@
+@protobuf(proto3)
+@jsonschema(id="https://example.org/mystruct1.json")
+
+----------------------------------------------------
+
+[
+	["attribute", "@protobuf"],
+	["punctuation", "("],
+	"proto3",
+	["punctuation", ")"],
+
+	["attribute", "@jsonschema"],
+	["punctuation", "("],
+	"id",
+	["operator", "="],
+	["string-literal", [
+		["string", "\"https://example.org/mystruct1.json\""]
+	]],
+	["punctuation", ")"]
+]

tests/languages/cue/boolean_feature.test

@@ -0,0 +1,9 @@
+true
+false
+
+----------------------------------------------------
+
+[
+	["boolean", "true"],
+	["boolean", "false"]
+]

tests/languages/cue/builtin_feature.test

@@ -0,0 +1,74 @@
+// Types
+null      // The null type and value
+bool      // All boolean values
+int       // All integral numbers
+float     // All decimal floating-point numbers
+string    // Any valid UTF-8 sequence
+bytes     // Any valid byte sequence
+
+// Derived   Value
+number    // int | float
+uint      // >=0
+uint8     // >=0 & <=255
+int8      // >=-128 & <=127
+uint16    // >=0 & <=65536
+int16     // >=-32_768 & <=32_767
+rune      // >=0 & <=0x10FFFF
+uint32    // >=0 & <=4_294_967_296
+int32     // >=-2_147_483_648 & <=2_147_483_647
+uint64    // >=0 & <=18_446_744_073_709_551_615
+int64     // >=-9_223_372_036_854_775_808 & <=9_223_372_036_854_775_807
+uint128   // >=0 & <=340_282_366_920_938_463_463_374_607_431_768_211_455
+int128    // >=-170_141_183_460_469_231_731_687_303_715_884_105_728 &
+          //  <=170_141_183_460_469_231_731_687_303_715_884_105_727
+float32   // >=-3.40282346638528859811704183484516925440e+38 &
+          // <=3.40282346638528859811704183484516925440e+38
+float64   // >=-1.797693134862315708145274237317043567981e+308 &
+          // <=1.797693134862315708145274237317043567981e+308
+
+----------------------------------------------------
+
+[
+	["comment", "// Types"],
+	["keyword", "null"], ["comment", "// The null type and value"],
+	["builtin", "bool"], ["comment", "// All boolean values"],
+	["builtin", "int"], ["comment", "// All integral numbers"],
+	["builtin", "float"], ["comment", "// All decimal floating-point numbers"],
+	["builtin", "string"], ["comment", "// Any valid UTF-8 sequence"],
+	["builtin", "bytes"], ["comment", "// Any valid byte sequence"],
+
+	["comment", "// Derived   Value"],
+	["builtin", "number"],
+	["comment", "// int | float"],
+	["builtin", "uint"],
+	["comment", "// >=0"],
+	["builtin", "uint8"],
+	["comment", "// >=0 & <=255"],
+	["builtin", "int8"],
+	["comment", "// >=-128 & <=127"],
+	["builtin", "uint16"],
+	["comment", "// >=0 & <=65536"],
+	["builtin", "int16"],
+	["comment", "// >=-32_768 & <=32_767"],
+	["builtin", "rune"],
+	["comment", "// >=0 & <=0x10FFFF"],
+	["builtin", "uint32"],
+	["comment", "// >=0 & <=4_294_967_296"],
+	["builtin", "int32"],
+	["comment", "// >=-2_147_483_648 & <=2_147_483_647"],
+	["builtin", "uint64"],
+	["comment", "// >=0 & <=18_446_744_073_709_551_615"],
+	["builtin", "int64"],
+	["comment", "// >=-9_223_372_036_854_775_808 & <=9_223_372_036_854_775_807"],
+	["builtin", "uint128"],
+	["comment", "// >=0 & <=340_282_366_920_938_463_463_374_607_431_768_211_455"],
+	["builtin", "int128"],
+	["comment", "// >=-170_141_183_460_469_231_731_687_303_715_884_105_728 &"],
+	["comment", "//  <=170_141_183_460_469_231_731_687_303_715_884_105_727"],
+	["builtin", "float32"],
+	["comment", "// >=-3.40282346638528859811704183484516925440e+38 &"],
+	["comment", "// <=3.40282346638528859811704183484516925440e+38"],
+	["builtin", "float64"],
+	["comment", "// >=-1.797693134862315708145274237317043567981e+308 &"],
+	["comment", "// <=1.797693134862315708145274237317043567981e+308"]
+]

tests/languages/cue/comment_feature.test

@@ -0,0 +1,7 @@
+// comment
+
+----------------------------------------------------
+
+[
+	["comment", "// comment"]
+]

tests/languages/cue/function_feature.test

@@ -0,0 +1,12 @@
+math.Sin(x)
+
+----------------------------------------------------
+
+[
+	"math",
+	["punctuation", "."],
+	["function", "Sin"],
+	["punctuation", "("],
+	"x",
+	["punctuation", ")"]
+]