planning

node_modules/remark-stringify/lib/visitors/emphasis.js

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+'use strict'
+
+module.exports = emphasis
+
+var underscore = '_'
+var asterisk = '*'
+
+// Stringify an `emphasis`.
+//
+// The marker used is configurable through `emphasis`, which defaults to an
+// underscore (`'_'`) but also accepts an asterisk (`'*'`):
+//
+// ```markdown
+// *foo*
+// ```
+//
+// In `pedantic` mode, text which itself contains an underscore will cause the
+// marker to default to an asterisk instead:
+//
+// ```markdown
+// *foo_bar*
+// ```
+function emphasis(node) {
+  var marker = this.options.emphasis
+  var content = this.all(node).join('')
+
+  // When in pedantic mode, prevent using underscore as the marker when there
+  // are underscores in the content.
+  if (
+    this.options.pedantic &&
+    marker === underscore &&
+    content.indexOf(marker) !== -1
+  ) {
+    marker = asterisk
+  }
+
+  return marker + content + marker
+}