From 9161a1a8ef9962ac7dd8f73d59ad2768160fa00e Mon Sep 17 00:00:00 2001
From: Gary Talent <gary@drinkingtea.net>
Date: Wed, 23 Mar 2022 03:08:04 -0500
Subject: [PATCH] [ox/std] Add BasicString::beginsWith

---
 deps/ox/src/ox/std/string.hpp     | 18 ++++++++++++++++++
 deps/ox/src/ox/std/test/tests.cpp |  5 +++++
 2 files changed, 23 insertions(+)

diff --git a/deps/ox/src/ox/std/string.hpp b/deps/ox/src/ox/std/string.hpp
index 04a1266b..6714eec4 100644
--- a/deps/ox/src/ox/std/string.hpp
+++ b/deps/ox/src/ox/std/string.hpp
@@ -166,6 +166,12 @@ class BasicString {
 		[[nodiscard]]
 		constexpr BasicString substr(std::size_t begin, std::size_t end) const noexcept;
 
+		[[nodiscard]]
+		constexpr bool beginsWith(const char *ending) const noexcept;
+
+		[[nodiscard]]
+		constexpr bool beginsWith(const BasicString &ending) const noexcept;
+
 		[[nodiscard]]
 		constexpr bool endsWith(const char *ending) const noexcept;
 
@@ -454,6 +460,18 @@ constexpr BasicString<SmallStringSize> BasicString<SmallStringSize>::substr(std:
 	return out;
 }
 
+template<std::size_t SmallStringSize>
+constexpr bool BasicString<SmallStringSize>::beginsWith(const char *beginning) const noexcept {
+	const auto beginningLen = ox::min(ox_strlen(beginning), len());
+	return ox_strncmp(data(), beginning, beginningLen) == 0;
+}
+
+template<std::size_t SmallStringSize>
+constexpr bool BasicString<SmallStringSize>::beginsWith(const BasicString &beginning) const noexcept {
+	const auto sz = ox::min(beginning.len(), len());;
+	return ox_strncmp(data(), beginning.c_str(), sz) == 0;
+}
+
 template<std::size_t SmallStringSize>
 constexpr bool BasicString<SmallStringSize>::endsWith(const char *ending) const noexcept {
 	const auto endingLen = ox_strlen(ending);
diff --git a/deps/ox/src/ox/std/test/tests.cpp b/deps/ox/src/ox/std/test/tests.cpp
index d5a6e7bb..a2a4a96c 100644
--- a/deps/ox/src/ox/std/test/tests.cpp
+++ b/deps/ox/src/ox/std/test/tests.cpp
@@ -78,6 +78,11 @@ std::map<std::string, std::function<ox::Error()>> tests = {
 			s += "aoeu";
 			oxAssert(s == "asdfaoeu", "String append broken");
 			ox::String ending = "asdf";
+			oxAssert(ending.beginsWith("as"), "String::beginsWith is broken");
+			oxAssert(!ending.beginsWith("aa"), "String::beginsWith is broken");
+			oxAssert(!ending.beginsWith("aaaaaaa"), "String::beginsWith is broken");
+			oxAssert(!ending.beginsWith("li"), "String::beginsWith is broken");
+			oxAssert(!ending.beginsWith("afoif"), "String::beginsWith is broken");
 			oxAssert(ending.endsWith("df"), "String::endsWith is broken");
 			oxAssert(!ending.endsWith("awefawe"), "String::endsWith is broken");
 			oxAssert(!ending.endsWith("eu"), "String::endsWith is broken");