planning

node_modules/micromark/lib/util/classify-character.mjs

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+export default classifyCharacter
+
+import codes from '../character/codes.mjs'
+import markdownLineEndingOrSpace from '../character/markdown-line-ending-or-space.mjs'
+import unicodePunctuation from '../character/unicode-punctuation.mjs'
+import unicodeWhitespace from '../character/unicode-whitespace.mjs'
+import constants from '../constant/constants.mjs'
+
+// Classify whether a character is unicode whitespace, unicode punctuation, or
+// anything else.
+// Used for attention (emphasis, strong), whose sequences can open or close
+// based on the class of surrounding characters.
+function classifyCharacter(code) {
+  if (
+    code === codes.eof ||
+    markdownLineEndingOrSpace(code) ||
+    unicodeWhitespace(code)
+  ) {
+    return constants.characterGroupWhitespace
+  }
+
+  if (unicodePunctuation(code)) {
+    return constants.characterGroupPunctuation
+  }
+}