planning

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

@@ -0,0 +1,27 @@
+'use strict'
+
+var codes = require('../character/codes.js')
+var markdownLineEndingOrSpace = require('../character/markdown-line-ending-or-space.js')
+var unicodePunctuation = require('../character/unicode-punctuation.js')
+var unicodeWhitespace = require('../character/unicode-whitespace.js')
+var constants = require('../constant/constants.js')
+
+// 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
+  }
+}
+
+module.exports = classifyCharacter