Feature/prism fhirpath formatting

content/assets/css/prism-fhirpath.css

@@ -0,0 +1,38 @@
+/* Custom formatting for the code blocks */
+pre.language-fhirpath {
+    background-color: #eee;
+    text-shadow: unset;
+}
+
+pre.language-fhirpath code.language-fhirpath {
+    white-space: pre-wrap;
+    text-shadow: unset;
+}
+
+.token.operator,
+.token.entity,
+.token.url,
+.language-css .token.string,
+.style .token.string {
+    background: unset;
+}
+
+
+pre.language-fhirpath.stu {
+    margin-left: 20px;
+    overflow: unset;
+}
+pre.language-fhirpath.stu:after {
+    left: -16px;
+}
+
+/* inline fhirpath code blocks used in examples */
+:not(pre) > code.fhirpath {
+    background-color: #eee;
+    padding: 1px 4px;
+    border: 1px solid #cccccc;
+    font-size: 1em;
+    display: inline-block;
+    margin: 2px 0;
+    text-shadow: unset;
+}

content/assets/js/prism-fhirpath.js

@@ -0,0 +1,67 @@
+/* eslint-disable regexp/prefer-d */
+// https://hl7.org/fhirpath
+Prism.languages.fhirpath = {
+	'comment': {
+		pattern: /\/\/.*|\/\*[\s\S]*?(?:\*\/|$)/,
+		greedy: true
+	},
+	'constant': [
+		// This is where I'm going to put in the literals for datetime/date/time/quantity
+		/@[0-9][0-9][0-9][0-9]-[0-9][0-9]-[0-9][0-9]T[0-9][0-9]:[0-9][0-9](:[0-9][0-9])?(\.[0-9]+)?(Z|[+\-][0-9][0-9]:[0-9][0-9])?/,
+		/@[0-9][0-9][0-9][0-9](-[0-9][0-9](-[0-9][0-9])?)?/,
+		/@T[0-9][0-9]:[0-9][0-9](:[0-9][0-9])?(\.[0-9]+)?/,
+		/\b\d+(?:(?:\.\d*)?(?:[eE][+-]?\d+)?)?\b\s+(years|months|weeks|days|hours|minutes|seconds|milliseconds|year|month|week|day|hour|minute|second|millisecond)\b/
+	],
+	'number': [
+		/\b\d+(?:\.\d+)?(?:e[+-]?\d+)?\b/i,
+		/\b\d+(?:\.\d+)?L\b/i
+	],
+	'string': {
+		pattern: /(^|[^\\])'(?:\\.|[^\\'\r\n])*'(?!\s*:)/,
+		lookbehind: true,
+		greedy: true
+	},
+	'punctuation': /[()[\],.]/,
+	'operator': /(>=|<=|!=|!~|[|\\+\-=<>~/*&])/,
+	'keyword': [
+		/\b(and|as|contains|day|days|div|hour|hours|implies|in|\$index|is|millisecond|milliseconds|minute|minutes|mod|month|months|or|second|seconds|\$this|\$total|week|weeks|xor|year|years)\b/,
+		/\{\s*\}/
+	],
+	'boolean': /\b(?:false|true)\b/,
+	'builtin': [
+		// section 5.1 http://hl7.org/fhirpath/#existence
+		/\b(empty|exists|all|allTrue|anyTrue|allFalse|anyFalse|subsetOf|supersetOf|count|distinct|isDistinct)\b/,
+		// section 5.2 http://hl7.org/fhirpath/#filtering-and-projection
+		/\b(where|select|repeat|ofType)\b/,
+		// section 5.3 http://hl7.org/fhirpath/#subsetting
+		/\b(single|first|last|tail|skip|take|intersect|exclude)\b/,
+		// section 5.4
+		/\b(union|combine)\b/,
+		// section 5.5
+		/\b(iif|toBoolean|convertsToBoolean|toInteger|convertsToInteger|toDate|convertsToDate|toDateTime|convertsToDateTime|toDecimal|convertsToDecimal|toQuantity|convertsToQuantity|toString|convertsToString|toTime|convertsToTime)\b/,
+		// section 5.6
+		/\b(indexOf|substring|startsWith|endsWith|contains|upper|lower|replace|matches|replaceMatches|length|toChars|split|join|encode|decode)\b/,
+		// section 5.7
+		/\b(abs|ceiling|exp|floor|ln|log|power|round|sqrt|truncate)\b/,
+		// section 5.8
+		/\b(children|descendants)\b/,
+		// section 5.9 (not is in section 6.5)
+		/\b(trace|now|timeOfDay|today|not)\b/,
+		// section 6.3
+		/\b(as|is)\b/,
+		// section 7
+		/\b(aggregate)\b/
+	],
+	'variable': [
+		/(%\w+)\b/,
+		/(%`(?:\w|x[0-9a-fA-F]{2}|u[0-9a-fA-F]{4}|[ \-\."\\\/fnrt])+`)/ // this isn;t quite right, but it's a start
+	],
+	'identifier': [
+		{
+			pattern: /`(?:\w|x[0-9a-fA-F]{2}|u[0-9a-fA-F]{4}|[ \-\."\\\/fnrt])+`/,
+			// lookbehind: true,
+			greedy: true
+		},
+		/\b([A-Za-z]|_)([A-Za-z0-9]|_)*\b/,
+	]
+};