From 210d59e416dacf339b4d6d3e380f451bbc63dc94 Mon Sep 17 00:00:00 2001
From: Coen ten Thije Boonkkamp <coen@coenttb.com>
Date: Sat, 26 Jul 2025 16:09:04 +0200
Subject: [PATCH] Add Parse extension for conversion initializer

This adds a convenience initializer to Parse that accepts a conversion and applies it to the rest of the input. This extension was originally in the URLRouting library but is better placed here as it's not specific to URL routing.
---
 Sources/Parsing/Conversion.swift | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/Sources/Parsing/Conversion.swift b/Sources/Parsing/Conversion.swift
index 6bc6500a4f..aac7c73773 100644
--- a/Sources/Parsing/Conversion.swift
+++ b/Sources/Parsing/Conversion.swift
@@ -26,3 +26,12 @@
   /// - Returns: An "un"-transformed input value.
   func unapply(_ output: Output) throws -> Input
 }
+
+extension Parse {
+  @inlinable
+  public init<Downstream>(
+    _ conversion: Downstream
+  ) where Parsers == Parsing.Parsers.MapConversion<Rest<Downstream.Input>, Downstream> {
+    self.init { Rest().map(conversion) }
+  }
+}