planning

node_modules/micromark/lib/util/safe-from-int.js

@@ -0,0 +1,32 @@
+'use strict'
+
+var codes = require('../character/codes.js')
+var values = require('../character/values.js')
+var fromCharCode = require('../constant/from-char-code.js')
+
+function safeFromInt(value, base) {
+  var code = parseInt(value, base)
+
+  if (
+    // C0 except for HT, LF, FF, CR, space
+    code < codes.ht ||
+    code === codes.vt ||
+    (code > codes.cr && code < codes.space) ||
+    // Control character (DEL) of the basic block and C1 controls.
+    (code > codes.tilde && code < 160) ||
+    // Lone high surrogates and low surrogates.
+    (code > 55295 && code < 57344) ||
+    // Noncharacters.
+    (code > 64975 && code < 65008) ||
+    (code & 65535) === 65535 ||
+    (code & 65535) === 65534 ||
+    // Out of range
+    code > 1114111
+  ) {
+    return values.replacementCharacter
+  }
+
+  return fromCharCode(code)
+}
+
+module.exports = safeFromInt