Revamping to matrix style

node_modules/micromark-util-classify-character/index.js

@@ -0,0 +1,27 @@
+/**
+ * @import {Code} from 'micromark-util-types'
+ */
+
+import { markdownLineEndingOrSpace, unicodePunctuation, unicodeWhitespace } from 'micromark-util-character';
+/**
+ * Classify whether a code represents whitespace, punctuation, or something
+ * else.
+ *
+ * Used for attention (emphasis, strong), whose sequences can open or close
+ * based on the class of surrounding characters.
+ *
+ * > 👉 **Note**: eof (`null`) is seen as whitespace.
+ *
+ * @param {Code} code
+ *   Code.
+ * @returns {typeof constants.characterGroupWhitespace | typeof constants.characterGroupPunctuation | undefined}
+ *   Group.
+ */
+export function classifyCharacter(code) {
+  if (code === null || markdownLineEndingOrSpace(code) || unicodeWhitespace(code)) {
+    return 1;
+  }
+  if (unicodePunctuation(code)) {
+    return 2;
+  }
+}