Add PromQL language support

components.json

@@ -875,6 +875,10 @@
 			"title": "Prolog",
 			"owner": "Golmote"
 		},
+		"promql": {
+			"title": "PromQL",
+			"owner": "arendjr"
+		},
 		"properties": {
 			"title": ".properties",
 			"owner": "Golmote"

components/prism-promql.js

@@ -0,0 +1,99 @@
+// Thanks to: https://github.com/prometheus-community/monaco-promql/blob/master/src/promql/promql.ts
+// As well as: https://kausal.co/blog/slate-prism-add-new-syntax-promql/
+
+(function (Prism) {
+	// PromQL Aggregation Operators
+	// (https://prometheus.io/docs/prometheus/latest/querying/operators/#aggregation-operators)
+	var aggregations = [
+		'sum',
+		'min',
+		'max',
+		'avg',
+		'group',
+		'stddev',
+		'stdvar',
+		'count',
+		'count_values',
+		'bottomk',
+		'topk',
+		'quantile'
+	];
+
+	// PromQL vector matching + the by and without clauses
+	// (https://prometheus.io/docs/prometheus/latest/querying/operators/#vector-matching)
+	var vectorMatching = [
+		'on',
+		'ignoring',
+		'group_right',
+		'group_left',
+		'by',
+		'without',
+	];
+
+	// PromQL offset modifier
+	// (https://prometheus.io/docs/prometheus/latest/querying/basics/#offset-modifier)
+	var offsetModifier = ['offset'];
+
+	var keywords = aggregations.concat(vectorMatching, offsetModifier);
+
+	Prism.languages.promql = {
+		'comment': {
+			pattern: /(^[ \t]*)#.*/m,
+			lookbehind: true
+		},
+		'vector-match': {
+			// Match the comma-separated label lists inside vector matching:
+			pattern: new RegExp('((?:' + vectorMatching.join('|') + ')\\s*)\\([^)]*\\)'),
+			lookbehind: true,
+			inside: {
+				'label-key': {
+					pattern: /\b[^,]*\b/,
+					alias: 'attr-name',
+				},
+				'punctuation': /[(),]/
+			},
+		},
+		'context-labels': {
+			pattern: /\{[^{}]*\}/,
+			inside: {
+				'label-key': {
+					pattern: /\b[a-z_]\w*(?=\s*(?:=~?|![=~]))/,
+					alias: 'attr-name',
+				},
+				'label-value': {
+					pattern: /(["'`])(?:\\[\s\S]|(?!\1)[^\\])*\1/,
+					greedy: true,
+					alias: 'attr-value',
+				},
+				'punctuation': /\{|\}|=~?|![=~]|,/,
+			},
+		},
+		'context-range': [
+			{
+				pattern: /\[[\w\s:]+\]/, // [1m]
+				inside: {
+					'punctuation': /\[|\]|:/,
+					'range-duration': {
+						pattern: /\b(?:\d+(?:[smhdwy]|ms))+\b/i,
+						alias: 'number',
+					},
+				},
+			},
+			{
+				pattern: /(\boffset\s+)\w+/, // offset 1m
+				lookbehind: true,
+				inside: {
+					'range-duration': {
+						pattern: /\b(?:\d+(?:[smhdwy]|ms))+\b/i,
+						alias: 'number',
+					},
+				},
+			},
+		],
+		'keyword': new RegExp('\\b(?:' + keywords.join('|') + ')\\b', 'i'),
+		'function': /\b[a-zA-Z_]\w*(?=\s*\()/i,
+		'number': /[-+]?(?:(?:\b\d+(?:\.\d+)?|\B\.\d+)(?:e[-+]?\d+)?\b|\b(?:0x[0-9a-f]+|nan|inf)\b)/i,
+		'operator': /[\^*/%+-]|==|!=|<=|<|>=|>|\b(?:and|unless|or)\b/i,
+		'punctuation': /[{};()`,.[\]]/,
+	};
+})(Prism);

examples/prism-promql.html

@@ -0,0 +1,17 @@
+<h2>Examples</h2>
+<pre><code># These examples are taken from: https://prometheus.io/docs/prometheus/latest/querying/examples/
+
+http_requests_total{job="apiserver", handler="/api/comments"}[5m]
+
+http_requests_total{job=~".*server"}
+
+max_over_time(deriv(rate(distance_covered_total[5s])[30s:5s])[10m:])
+
+sum by (job) (
+  rate(http_requests_total[5m])
+)
+
+sum by (app, proc) (
+  instance_memory_limit_bytes - instance_memory_usage_bytes
+) / 1024 / 1024
+</code></pre>

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

@@ -147,6 +147,7 @@
 		"pq": "PowerQuery",
 		"mscript": "PowerQuery",
 		"powershell": "PowerShell",
+		"promql": "PromQL",
 		"properties": ".properties",
 		"protobuf": "Protocol Buffers",
 		"purebasic": "PureBasic",

tests/languages/promql/aggregate_selection.test

@@ -0,0 +1,30 @@
+sum by (job) (
+	rate(http_requests_total[5m])
+)
+
+----------------------------------------------------
+
+[
+	["keyword", "sum"],
+	["keyword", "by"],
+	["vector-match", [
+        ["punctuation", "("],
+        ["label-key", "job"],
+        ["punctuation", ")"]
+    ]],
+	["punctuation", "("],
+	["function", "rate"],
+	["punctuation", "("],
+	"http_requests_total",
+	["context-range", [
+		["punctuation", "["],
+		["range-duration", "5m"],
+		["punctuation", "]"]
+	]],
+	["punctuation", ")"],
+	["punctuation", ")"]
+]
+
+----------------------------------------------------
+
+Checks aggregate query.

tests/languages/promql/comment_feature.test

@@ -0,0 +1,11 @@
+# These examples are taken from ...
+
+----------------------------------------------------
+
+[
+	["comment", "# These examples are taken from ..."]
+]
+
+----------------------------------------------------
+
+Checks for comments.

tests/languages/promql/subquery_selection.test

@@ -0,0 +1,38 @@
+max_over_time(deriv(rate(distance_covered_total[5s])[30s:5s])[10m:])
+
+----------------------------------------------------
+
+[
+	["function", "max_over_time"],
+	["punctuation", "("],
+	["function", "deriv"],
+	["punctuation", "("],
+	["function", "rate"],
+	["punctuation", "("],
+	"distance_covered_total",
+	["context-range", [
+		["punctuation", "["],
+		["range-duration", "5s"],
+		["punctuation", "]"]
+	]],
+	["punctuation", ")"],
+	["context-range", [
+		["punctuation", "["],
+		["range-duration", "30s"],
+		["punctuation", ":"],
+		["range-duration", "5s"],
+		["punctuation", "]"]
+	]],
+	["punctuation", ")"],
+	["context-range", [
+		["punctuation", "["],
+		["range-duration", "10m"],
+		["punctuation", ":"],
+		["punctuation", "]"]
+	]],
+	["punctuation", ")"]
+]
+
+----------------------------------------------------
+
+Checks subquery.

tests/languages/promql/time_series_selection.test

@@ -0,0 +1,38 @@
+http_requests_total{job="apiserver", handler="/api/comments"}[5m]
+
+http_requests_total{job=~".*server"}
+
+----------------------------------------------------
+
+[
+	"http_requests_total",
+	["context-labels", [
+		["punctuation", "{"],
+		["label-key", "job"],
+		["punctuation", "="],
+		["label-value", "\"apiserver\""],
+		["punctuation", ","],
+		["label-key", "handler"],
+		["punctuation", "="],
+		["label-value", "\"/api/comments\""],
+		["punctuation", "}"]
+	]],
+	["context-range", [
+		["punctuation", "["],
+		["range-duration", "5m"],
+		["punctuation", "]"]
+	]],
+
+	"\r\n\r\nhttp_requests_total",
+	["context-labels", [
+		["punctuation", "{"],
+		["label-key", "job"],
+		["punctuation", "=~"],
+		["label-value", "\".*server\""],
+		["punctuation", "}"]
+	]]
+]
+
+----------------------------------------------------
+
+Checks simple time series queries.