Improve dollar (#20672)

* Improve dollar for uri

* Refactor

* .

* .

* verde

* optimize

* https://github.com/nim-lang/Nim/pull/20672#issuecomment-1295440246 [skip ci]

* https://github.com/nim-lang/Nim/pull/20670#issuecomment-1295937393

* ci

* Update lib/pure/uri.nim

Co-authored-by: Andreas Rumpf <rumpf_a@web.de>

changelog.md

@@ -113,6 +113,8 @@
 - `random.rand` now works with `Ordinal`s.
 - Undeprecated `os.isvalidfilename`.
 - `std/oids` now uses `int64` to store time internally (before it was int32).
+- `std/uri.Uri` dollar `$` improved, precalculates the `string` result length from the `Uri`.
+
 
 [//]: # "Additions:"
 - Added ISO 8601 week date utilities in `times`:

lib/pure/uri.nim

@@ -494,42 +494,61 @@ func `$`*(u: Uri): string =
   ## Returns the string representation of the specified URI object.
   runnableExamples:
     assert $parseUri("https://nim-lang.org") == "https://nim-lang.org"
-  result = ""
+  # Get the len of all the parts.
-  if u.scheme.len > 0:
+  let schemeLen = u.scheme.len
-    result.add(u.scheme)
+  let usernameLen = u.username.len
-    if u.opaque:
+  let passwordLen = u.password.len
-      result.add(":")
+  let hostnameLen = u.hostname.len
-    else:
+  let portLen = u.port.len
-      result.add("://")
+  let pathLen = u.path.len
-  if u.username.len > 0:
+  let queryLen = u.query.len
-    result.add(u.username)
+  let anchorLen = u.anchor.len
-    if u.password.len > 0:
+  # Prepare a string that fits all the parts and all punctuation chars.
-      result.add(":")
+  # 12 is the max len required by all possible punctuation chars.
-      result.add(u.password)
+  result = newStringOfCap(
-    result.add("@")
+    schemeLen + usernameLen + passwordLen + hostnameLen + portLen + pathLen + queryLen + anchorLen + 12
+  )
+  # Insert to result.
+  if schemeLen > 0:
+    result.add u.scheme
+    result.add ':'
+    if not u.opaque:
+      result.add '/'
+      result.add '/'
+  if usernameLen > 0:
+    result.add u.username
+    if passwordLen > 0:
+      result.add ':'
+      result.add u.password
+    result.add '@'
   if u.hostname.endsWith('/'):
     if u.isIpv6:
-      result.add("[" & u.hostname[0 .. ^2] & "]")
+      result.add '['
+      result.add u.hostname[0 .. ^2]
+      result.add ']'
     else:
-      result.add(u.hostname[0 .. ^2])
+      result.add u.hostname[0 .. ^2]
   else:
     if u.isIpv6:
-      result.add("[" & u.hostname & "]")
+      result.add '['
+      result.add u.hostname
+      result.add ']'
     else:
-      result.add(u.hostname)
+      result.add u.hostname
-  if u.port.len > 0:
+  if portLen > 0:
-    result.add(":")
+    result.add ':'
-    result.add(u.port)
+    result.add u.port
-  if u.path.len > 0:
+  if pathLen > 0:
-    if u.hostname.len > 0 and u.path[0] != '/':
+    if hostnameLen > 0 and u.path[0] != '/':
-      result.add('/')
+      result.add '/'
-    result.add(u.path)
+    result.add u.path
-  if u.query.len > 0:
+  if queryLen > 0:
-    result.add("?")
+    result.add '?'
-    result.add(u.query)
+    result.add u.query
-  if u.anchor.len > 0:
+  if anchorLen > 0:
-    result.add("#")
+    result.add '#'
-    result.add(u.anchor)
+    result.add u.anchor
+
 
 proc getDataUri*(data, mime: string, encoding = "utf-8"): string {.since: (1, 3).} =
   ## Convenience proc for `base64.encode` returns a standard Base64 Data URI (RFC-2397)