[Init] Initial commit - NetMesh terminal manager

components/terminal/keywordHighlightRegex.ts

@@ -0,0 +1,48 @@
+import { RE2JS } from 're2js';
+
+export type NonEmptyRangeVisitor = (start: number, length: number) => boolean | void;
+
+export function compileRe2RangeMatcher(pattern: string): (text: string, onMatch: NonEmptyRangeVisitor) => void {
+  const compiled = RE2JS.compile(pattern, RE2JS.CASE_INSENSITIVE);
+  return (text, onMatch) => {
+    const matcher = compiled.matcher(text);
+    while (matcher.find()) {
+      const start = matcher.start();
+      const end = matcher.end();
+      if (end > start && onMatch(start, end - start) === false) break;
+    }
+  };
+}
+
+export function forEachNonEmptyRe2Match(
+  pattern: string,
+  text: string,
+  onMatch: NonEmptyRangeVisitor,
+): void {
+  compileRe2RangeMatcher(pattern)(text, onMatch);
+}
+
+export function forEachNonEmptyRegexMatch(
+  regex: RegExp,
+  text: string,
+  onMatch: (match: RegExpExecArray) => void,
+) {
+  regex.lastIndex = 0;
+
+  let match: RegExpExecArray | null;
+  while ((match = regex.exec(text)) !== null) {
+    if (match[0].length === 0) {
+      if (regex.lastIndex <= match.index) {
+        // Advance past the full code point to avoid landing inside a surrogate pair
+        const code = text.charCodeAt(match.index);
+        regex.lastIndex = match.index + (code >= 0xD800 && code <= 0xDBFF ? 2 : 1);
+      }
+      if (regex.lastIndex > text.length) {
+        break;
+      }
+      continue;
+    }
+
+    onMatch(match);
+  }
+}