arcade.js
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	/*
	Language: ArcGIS Arcade
	Category: scripting
	Author: John Foster <jfoster@esri.com>
	Website: https://developers.arcgis.com/arcade/
	Description: ArcGIS Arcade is an expression language used in many Esri ArcGIS products such as Pro, Online, Server, Runtime, JavaScript, and Python
	*/

	/** @type LanguageFn */
	function arcade(hljs) {
	const IDENT_RE = '[A-Za-z_][0-9A-Za-z_]*';
	const KEYWORDS = {
	keyword: [
	"if",
	"for",
	"while",
	"var",
	"new",
	"function",
	"do",
	"return",
	"void",
	"else",
	"break"
	],
	literal: [
	"BackSlash",
	"DoubleQuote",
	"false",
	"ForwardSlash",
	"Infinity",
	"NaN",
	"NewLine",
	"null",
	"PI",
	"SingleQuote",
	"Tab",
	"TextFormatting",
	"true",
	"undefined"
	],
	built_in: [
	"Abs",
	"Acos",
	"All",
	"Angle",
	"Any",
	"Area",
	"AreaGeodetic",
	"Array",
	"Asin",
	"Atan",
	"Atan2",
	"Attachments",
	"Average",
	"Back",
	"Bearing",
	"Boolean",
	"Buffer",
	"BufferGeodetic",
	"Ceil",
	"Centroid",
	"Clip",
	"Concatenate",
	"Console",
	"Constrain",
	"Contains",
	"ConvertDirection",
	"Cos",
	"Count",
	"Crosses",
	"Cut",
	"Date",
	"DateAdd",
	"DateDiff",
	"Day",
	"Decode",
	"DefaultValue",
	"Densify",
	"DensifyGeodetic",
	"Dictionary",
	"Difference",
	"Disjoint",
	"Distance",
	"DistanceGeodetic",
	"Distinct",
	"Domain",
	"DomainCode",
	"DomainName",
	"EnvelopeIntersects",
	"Equals",
	"Erase",
	"Exp",
	"Expects",
	"Extent",
	"Feature",
	"FeatureSet",
	"FeatureSetByAssociation",
	"FeatureSetById",
	"FeatureSetByName",
	"FeatureSetByPortalItem",
	"FeatureSetByRelationshipName",
	"Filter",
	"Find",
	"First",
	"Floor",
	"FromCharCode",
	"FromCodePoint",
	"FromJSON",
	"GdbVersion",
	"Generalize",
	"Geometry",
	"GetFeatureSet",
	"GetUser",
	"GroupBy",
	"Guid",
	"Hash",
	"HasKey",
	"Hour",
	"IIf",
	"Includes",
	"IndexOf",
	"Insert",
	"Intersection",
	"Intersects",
	"IsEmpty",
	"IsNan",
	"ISOMonth",
	"ISOWeek",
	"ISOWeekday",
	"ISOYear",
	"IsSelfIntersecting",
	"IsSimple",
	"Left\|0",
	"Length",
	"Length3D",
	"LengthGeodetic",
	"Log",
	"Lower",
	"Map",
	"Max",
	"Mean",
	"Mid",
	"Millisecond",
	"Min",
	"Minute",
	"Month",
	"MultiPartToSinglePart",
	"Multipoint",
	"NextSequenceValue",
	"None",
	"Now",
	"Number",
	"Offset\|0",
	"OrderBy",
	"Overlaps",
	"Point",
	"Polygon",
	"Polyline",
	"Pop",
	"Portal",
	"Pow",
	"Proper",
	"Push",
	"Random",
	"Reduce",
	"Relate",
	"Replace",
	"Resize",
	"Reverse",
	"Right\|0",
	"RingIsClockwise",
	"Rotate",
	"Round",
	"Schema",
	"Second",
	"SetGeometry",
	"Simplify",
	"Sin",
	"Slice",
	"Sort",
	"Splice",
	"Split",
	"Sqrt",
	"Stdev",
	"SubtypeCode",
	"SubtypeName",
	"Subtypes",
	"Sum",
	"SymmetricDifference",
	"Tan",
	"Text",
	"Timestamp",
	"ToCharCode",
	"ToCodePoint",
	"Today",
	"ToHex",
	"ToLocal",
	"Top\|0",
	"Touches",
	"ToUTC",
	"TrackAccelerationAt",
	"TrackAccelerationWindow",
	"TrackCurrentAcceleration",
	"TrackCurrentDistance",
	"TrackCurrentSpeed",
	"TrackCurrentTime",
	"TrackDistanceAt",
	"TrackDistanceWindow",
	"TrackDuration",
	"TrackFieldWindow",
	"TrackGeometryWindow",
	"TrackIndex",
	"TrackSpeedAt",
	"TrackSpeedWindow",
	"TrackStartTime",
	"TrackWindow",
	"Trim",
	"TypeOf",
	"Union",
	"Upper",
	"UrlEncode",
	"Variance",
	"Week",
	"Weekday",
	"When",
	"Within",
	"Year"
	]
	};
	const SYMBOL = {
	className: 'symbol',
	begin: '\\$[datastore\|feature\|layer\|map\|measure\|sourcefeature\|sourcelayer\|targetfeature\|targetlayer\|value\|view]+'
	};
	const NUMBER = {
	className: 'number',
	variants: [
	{ begin: '\\b(0[bB][01]+)' },
	{ begin: '\\b(0[oO][0-7]+)' },
	{ begin: hljs.C_NUMBER_RE }
	],
	relevance: 0
	};
	const SUBST = {
	className: 'subst',
	begin: '\\$\\{',
	end: '\\}',
	keywords: KEYWORDS,
	contains: [] // defined later
	};
	const TEMPLATE_STRING = {
	className: 'string',
	begin: '`',
	end: '`',
	contains: [
	hljs.BACKSLASH_ESCAPE,
	SUBST
	]
	};
	SUBST.contains = [
	hljs.APOS_STRING_MODE,
	hljs.QUOTE_STRING_MODE,
	TEMPLATE_STRING,
	NUMBER,
	hljs.REGEXP_MODE
	];
	const PARAMS_CONTAINS = SUBST.contains.concat([
	hljs.C_BLOCK_COMMENT_MODE,
	hljs.C_LINE_COMMENT_MODE
	]);

	return {
	name: 'ArcGIS Arcade',
	case_insensitive: true,
	keywords: KEYWORDS,
	contains: [
	hljs.APOS_STRING_MODE,
	hljs.QUOTE_STRING_MODE,
	TEMPLATE_STRING,
	hljs.C_LINE_COMMENT_MODE,
	hljs.C_BLOCK_COMMENT_MODE,
	SYMBOL,
	NUMBER,
	{ // object attr container
	begin: /[{,]\s*/,
	relevance: 0,
	contains: [
	{
	begin: IDENT_RE + '\\s*:',
	returnBegin: true,
	relevance: 0,
	contains: [
	{
	className: 'attr',
	begin: IDENT_RE,
	relevance: 0
	}
	]
	}
	]
	},
	{ // "value" container
	begin: '(' + hljs.RE_STARTERS_RE + '\|\\b(return)\\b)\\s*',
	keywords: 'return',
	contains: [
	hljs.C_LINE_COMMENT_MODE,
	hljs.C_BLOCK_COMMENT_MODE,
	hljs.REGEXP_MODE,
	{
	className: 'function',
	begin: '(\$.?\$\|' + IDENT_RE + ')\\s=>',
	returnBegin: true,
	end: '\\s*=>',
	contains: [
	{
	className: 'params',
	variants: [
	{ begin: IDENT_RE },
	{ begin: /$\s*$/ },
	{
	begin: /\(/,
	end: /\)/,
	excludeBegin: true,
	excludeEnd: true,
	keywords: KEYWORDS,
	contains: PARAMS_CONTAINS
	}
	]
	}
	]
	}
	],
	relevance: 0
	},
	{
	beginKeywords: 'function',
	end: /\{/,
	excludeEnd: true,
	contains: [
	hljs.inherit(hljs.TITLE_MODE, {
	className: "title.function",
	begin: IDENT_RE
	}),
	{
	className: 'params',
	begin: /\(/,
	end: /\)/,
	excludeBegin: true,
	excludeEnd: true,
	contains: PARAMS_CONTAINS
	}
	],
	illegal: /\[\|%/
	},
	{ begin: /\$[(.]/ }
	],
	illegal: /#(?!!)/
	};
	}

	module.exports = arcade;

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