planning

node_modules/micromark/lib/util/normalize-uri.mjs

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+export default normalizeUri
+
+import asciiAlphanumeric from '../character/ascii-alphanumeric.mjs'
+import codes from '../character/codes.mjs'
+import values from '../character/values.mjs'
+import fromCharCode from '../constant/from-char-code.mjs'
+
+// Encode unsafe characters with percent-encoding, skipping already
+// encoded sequences.
+function normalizeUri(value) {
+  var index = -1
+  var result = []
+  var start = 0
+  var skip = 0
+  var code
+  var next
+  var replace
+
+  while (++index < value.length) {
+    code = value.charCodeAt(index)
+
+    // A correct percent encoded value.
+    if (
+      code === codes.percentSign &&
+      asciiAlphanumeric(value.charCodeAt(index + 1)) &&
+      asciiAlphanumeric(value.charCodeAt(index + 2))
+    ) {
+      skip = 2
+    }
+    // ASCII.
+    else if (code < 128) {
+      if (!/[!#$&-;=?-Z_a-z~]/.test(fromCharCode(code))) {
+        replace = fromCharCode(code)
+      }
+    }
+    // Astral.
+    else if (code > 55295 && code < 57344) {
+      next = value.charCodeAt(index + 1)
+
+      // A correct surrogate pair.
+      if (code < 56320 && next > 56319 && next < 57344) {
+        replace = fromCharCode(code, next)
+        skip = 1
+      }
+      // Lone surrogate.
+      else {
+        replace = values.replacementCharacter
+      }
+    }
+    // Unicode.
+    else {
+      replace = fromCharCode(code)
+    }
+
+    if (replace) {
+      result.push(value.slice(start, index), encodeURIComponent(replace))
+      start = index + skip + 1
+      replace = undefined
+    }
+
+    if (skip) {
+      index += skip
+      skip = 0
+    }
+  }
+
+  return result.join('') + value.slice(start)
+}