From 01b4560a4d6d3f3e126a78e9322939ee213fe39d Mon Sep 17 00:00:00 2001
From: "google-labs-jules[bot]"
 <161369871+google-labs-jules[bot]@users.noreply.github.com>
Date: Wed, 7 Jan 2026 13:12:51 +0000
Subject: [PATCH] =?UTF-8?q?=E2=9A=A1=20Bolt:=20Optimize=20SVG=20number=20p?=
 =?UTF-8?q?arsing?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Reduces memory allocation during SVG path parsing by creating Substrings directly from the original input string instead of allocating new Strings from UTF8View slices. This leverages `Double.init<S: StringProtocol>(_ text: S)`.
---
 Sources/SVGKit/SVGPathParser.swift | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/Sources/SVGKit/SVGPathParser.swift b/Sources/SVGKit/SVGPathParser.swift
index bb00eb2e..e8b5cc53 100644
--- a/Sources/SVGKit/SVGPathParser.swift
+++ b/Sources/SVGKit/SVGPathParser.swift
@@ -166,8 +166,9 @@ public enum SVGParseError: Error, LocalizedError {
 // MARK: - Internal Scanner
 
 private final class PathScanner: @unchecked Sendable {
+    private let originalInput: String
     private let input: String.UTF8View
-    private var index: String.UTF8View.Index
+    private var index: String.Index
 
     // Lookup table for whitespace characters
     // 0x09: tab, 0x0A: line feed, 0x0C: form feed, 0x0D: carriage return, 0x20: space
@@ -183,6 +184,7 @@ private final class PathScanner: @unchecked Sendable {
     }
 
     init(_ input: String) {
+        originalInput = input
         self.input = input.utf8
         index = self.input.startIndex
     }
@@ -260,7 +262,10 @@ private final class PathScanner: @unchecked Sendable {
         }
 
         let slice = input[startIndex ..< index]
-        guard !slice.isEmpty, let string = String(slice), let value = Double(string) else {
+        // OPTIMIZATION: Use Substring from original string to avoid String allocation from UTF8View slice.
+        // Swift's Double.init<S>(_ text: S) where S : StringProtocol handles Substring efficiently.
+        let substring = originalInput[startIndex ..< index]
+        guard !slice.isEmpty, let value = Double(substring) else {
             if slice.isEmpty { return nil }
             // Using Array(slice) to create [UInt8] for String decoding
             let bytes = Array(slice)