planning

node_modules/micromark/lib/tokenize/thematic-break.mjs

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+var thematicBreak = {
+  name: 'thematicBreak',
+  tokenize: tokenizeThematicBreak
+}
+export default thematicBreak
+
+import assert from 'assert'
+import codes from '../character/codes.mjs'
+import markdownLineEnding from '../character/markdown-line-ending.mjs'
+import markdownSpace from '../character/markdown-space.mjs'
+import constants from '../constant/constants.mjs'
+import types from '../constant/types.mjs'
+import spaceFactory from './factory-space.mjs'
+
+function tokenizeThematicBreak(effects, ok, nok) {
+  var size = 0
+  var marker
+
+  return start
+
+  function start(code) {
+    assert(
+      code === codes.asterisk ||
+        code === codes.dash ||
+        code === codes.underscore,
+      'expected `*`, `-`, or `_`'
+    )
+
+    effects.enter(types.thematicBreak)
+    marker = code
+    return atBreak(code)
+  }
+
+  function atBreak(code) {
+    if (code === marker) {
+      effects.enter(types.thematicBreakSequence)
+      return sequence(code)
+    }
+
+    if (markdownSpace(code)) {
+      return spaceFactory(effects, atBreak, types.whitespace)(code)
+    }
+
+    if (
+      size < constants.thematicBreakMarkerCountMin ||
+      (code !== codes.eof && !markdownLineEnding(code))
+    ) {
+      return nok(code)
+    }
+
+    effects.exit(types.thematicBreak)
+    return ok(code)
+  }
+
+  function sequence(code) {
+    if (code === marker) {
+      effects.consume(code)
+      size++
+      return sequence
+    }
+
+    effects.exit(types.thematicBreakSequence)
+    return atBreak(code)
+  }
+}