vmui: fix auto-completion triggers (#6566)

### Describe Your Changes

- Fixes auto-complete triggers according to [these
comments](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/5866#issuecomment-2065273421).
- Fixes loading and displaying suggestions when there is no metric in
the expression.
   Related issue: #6153
- Adds quotes when inserting label values. 
   Related issue: #6260

- [x] My change adheres [VictoriaMetrics contributing
guidelines](https://docs.victoriametrics.com/contributing/).

app/vmui/packages/vmui/src/components/Configurators/QueryEditor/QueryEditorAutocomplete.tsx

@@ -34,14 +34,25 @@ const QueryEditorAutocomplete: FC<QueryEditorAutocompleteProps> = ({
   }, [value, caretPosition]);
 
   const exprLastPart = useMemo(() => {
-    const parts = values.beforeCursor.split("}");
+    const regexpSplit = /\s(or|and|unless|default|ifnot|if|group_left|group_right)\s|}|\+|\|-|\*|\/|\^/i;
+    const parts = values.beforeCursor.split(regexpSplit);
     return parts[parts.length - 1];
   }, [values]);
 
   const metric = useMemo(() => {
-    const regexp = /\b[^{}(),\s]+(?={|$)/g;
-    const match = exprLastPart.match(regexp);
-    return match ? match[0] : "";
+    const regex1 = /\w+\((?<metricName>[^)]+)\)\s+(by|without|on|ignoring)\s*\(\w*/gi;
+    const matchAlt = [...exprLastPart.matchAll(regex1)];
+    if (matchAlt.length > 0 && matchAlt[0].groups && matchAlt[0].groups.metricName) {
+      return matchAlt[0].groups.metricName;
+    }
+
+    const regex2 = /^\s*\b(?<metricName>[^{}(),\s]+)(?={|$)/g;
+    const match = [...exprLastPart.matchAll(regex2)];
+    if (match.length > 0 && match[0].groups && match[0].groups.metricName) {
+      return match[0].groups.metricName;
+    }
+
+    return "";
   }, [exprLastPart]);
 
   const label = useMemo(() => {
@@ -51,7 +62,7 @@ const QueryEditorAutocomplete: FC<QueryEditorAutocompleteProps> = ({
   }, [exprLastPart]);
 
   const shouldSuppressAutoSuggestion = (value: string) => {
-    const pattern = /([{(),+\-*/^]|\b(?:or|and|unless|default|ifnot|if|group_left|group_right)\b)/;
+    const pattern = /([{(),+\-*/^]|\b(?:or|and|unless|default|ifnot|if|group_left|group_right|by|without|on|ignoring)\b)/i;
     const parts = value.split(/\s+/);
     const partsCount = parts.length;
     const lastPart = parts[partsCount - 1];
@@ -63,12 +74,16 @@ const QueryEditorAutocomplete: FC<QueryEditorAutocompleteProps> = ({
   };
 
   const context = useMemo(() => {
-    if (!values.beforeCursor || values.beforeCursor.endsWith("}") || shouldSuppressAutoSuggestion(values.beforeCursor)) {
+    const valueBeforeCursor = values.beforeCursor.trim();
+    const endOfClosedBrackets = ["}", ")"].some(char => valueBeforeCursor.endsWith(char));
+    const endOfClosedQuotes = !hasUnclosedQuotes(valueBeforeCursor) && ["`", "'", "\""].some(char => valueBeforeCursor.endsWith(char));
+    if (!values.beforeCursor || endOfClosedBrackets || endOfClosedQuotes || shouldSuppressAutoSuggestion(values.beforeCursor)) {
       return QueryContextType.empty;
     }
 
-    const labelRegexp = /\{[^}]*$/;
-    const labelValueRegexp = new RegExp(`(${escapeRegexp(metric)})?{?.+${escapeRegexp(label)}(=|!=|=~|!~)"?([^"]*)$`, "g");
+    const labelRegexp = /(?:by|without|on|ignoring)\s*\(\s*[^)]*$|\{[^}]*$/i;
+    const patternLabelValue = `(${escapeRegexp(metric)})?{?.+${escapeRegexp(label)}(=|!=|=~|!~)"?([^"]*)$`;
+    const labelValueRegexp = new RegExp(patternLabelValue, "g");
 
     switch (true) {
       case labelValueRegexp.test(values.beforeCursor):
@@ -81,7 +96,7 @@ const QueryEditorAutocomplete: FC<QueryEditorAutocompleteProps> = ({
   }, [values, metric, label]);
 
   const valueByContext = useMemo(() => {
-    const wordMatch = values.beforeCursor.match(/([\w_\-.:/]+(?![},]))$/);
+    const wordMatch = values.beforeCursor.match(/([\w_.:]+(?![},]))$/);
     return wordMatch ? wordMatch[0] : "";
   }, [values.beforeCursor]);
 
@@ -119,9 +134,10 @@ const QueryEditorAutocomplete: FC<QueryEditorAutocompleteProps> = ({
     // Add quotes around the value if the context is labelValue
     if (context === QueryContextType.labelValue) {
       const quote = "\"";
-      const needsQuote = /(?:=|!=|=~|!~)$/.test(beforeValueByContext);
       valueAfterCursor = valueAfterCursor.replace(/^[^\s"|},]*/, "");
-      insert = `${needsQuote ? quote : ""}${insert}`;
+      const needsOpenQuote = /(?:=|!=|=~|!~)$/.test(beforeValueByContext);
+      const needsCloseQuote = valueAfterCursor.trim()[0] !== "\"";
+      insert = `${needsOpenQuote ? quote : ""}${insert}${needsCloseQuote ? quote : ""}`;
     }
 
     if (context === QueryContextType.label) {

app/vmui/packages/vmui/src/hooks/useFetchQueryOptions.tsx

@@ -137,7 +137,7 @@ export const useFetchQueryOptions = ({ valueByContext, metric, label, context }:
 
   // fetch labels
   useEffect(() => {
-    if (!serverUrl || !metric || context !== QueryContextType.label) {
+    if (!serverUrl || context !== QueryContextType.label) {
       return;
     }
     setLabels([]);
@@ -149,7 +149,7 @@ export const useFetchQueryOptions = ({ valueByContext, metric, label, context }:
       urlSuffix: "labels",
       setter: setLabels,
       type: TypeData.label,
-      params: getQueryParams({ "match[]": `{__name__="${metricEscaped}"}` })
+      params: getQueryParams(metric ? { "match[]": `{__name__="${metricEscaped}"}` } : undefined)
     });
 
     return () => abortControllerRef.current?.abort();
@@ -157,20 +157,23 @@ export const useFetchQueryOptions = ({ valueByContext, metric, label, context }:
 
   // fetch labelValues
   useEffect(() => {
-    if (!serverUrl || !metric || !label || context !== QueryContextType.labelValue) {
+    if (!serverUrl || !label || context !== QueryContextType.labelValue) {
       return;
     }
     setLabelValues([]);
 
     const metricEscaped = escapeDoubleQuotes(metric);
     const valueReEscaped = escapeDoubleQuotes(escapeRegexp(value));
+    const matchMetric = metric ? `__name__="${metricEscaped}"` : "";
+    const matchLabel = `${label}=~".*${valueReEscaped}.*"`;
+    const matchValue = [matchMetric, matchLabel].filter(Boolean).join(",");
 
     fetchData({
       value,
       urlSuffix: `label/${label}/values`,
       setter: setLabelValues,
       type: TypeData.labelValue,
-      params: getQueryParams({ "match[]": `{__name__="${metricEscaped}", ${label}=~".*${valueReEscaped}.*"}` })
+      params: getQueryParams({ "match[]": `{${matchValue}}` })
     });
 
     return () => abortControllerRef.current?.abort();

app/vmui/packages/vmui/src/utils/regexp.ts

@@ -8,6 +8,6 @@ export const escapeDoubleQuotes = (s: string) => {
 };
 
 export const hasUnclosedQuotes = (str: string) => {
-  const matches = str.match(/"/g);
+  const matches = str.match(/["`']/g);
   return matches ? matches.length % 2 !== 0 : false;
 };

docs/CHANGELOG.md

@@ -40,6 +40,8 @@ See also [LTS releases](https://docs.victoriametrics.com/lts-releases/).
 * BUGFIX: all VictoriaMetrics components: validate files specified via `-tlsKeyFile` and `-tlsCertFile` cmd-line flags on the process start-up. Previously, validation happened on the first connection accepted by HTTP server. See [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/6608) for the details. Thanks to @yincongcyincong for the [pull request](https://github.com/VictoriaMetrics/VictoriaMetrics/pull/6621).
 * BUGFIX: [vmauth](https://docs.victoriametrics.com/vmauth/): properly proxy requests to backend urls ending with `/` if the original request path equals to `/`. Previously the trailing `/` at the backend path was incorrectly removed. For example, if the request to `http://vmauth/` is configured to be proxied to `url_prefix=http://backend/foo/`, then it was proxied to `http://backend/foo`, while it should go to `http://backend/foo/`.
 * BUGFIX: [vmauth](https://docs.victoriametrics.com/vmauth/): fix `cannot read data after closing the reader` error when proxying HTTP requests without body (aka `GET` requests). The issue has been introduced in [v1.102.0](https://github.com/VictoriaMetrics/VictoriaMetrics/releases/tag/v1.102.0) in [this commit](https://github.com/VictoriaMetrics/VictoriaMetrics/commit/7ee57974935a662896f2de40fdf613156630617d).
+* BUGFIX: [vmui](https://docs.victoriametrics.com/#vmui): fix auto-completion triggers for metric and label names, and disable it after specific characters. See [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/6153) and [these comments](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/5866#issuecomment-2065273421).
+* BUGFIX: [vmui](https://docs.victoriametrics.com/#vmui): fix automatic addition of quotes when inserting label values from autocomplete suggestions. See [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/6260).
 
 ## [v1.102.0](https://github.com/VictoriaMetrics/VictoriaMetrics/releases/tag/v1.102.0)