From 01959b16a21b22b5df5f16569c2a8e8f92beecef Mon Sep 17 00:00:00 2001
From: mo khan <mo@mokhan.ca>
Date: Thu, 10 Jul 2025 13:11:11 -0600
Subject: chore: vendor dependencies

---
 vendor/writeable/src/testing.rs | 78 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 78 insertions(+)
 create mode 100644 vendor/writeable/src/testing.rs

(limited to 'vendor/writeable/src/testing.rs')

diff --git a/vendor/writeable/src/testing.rs b/vendor/writeable/src/testing.rs
new file mode 100644
index 00000000..078ea9e2
--- /dev/null
+++ b/vendor/writeable/src/testing.rs
@@ -0,0 +1,78 @@
+// This file is part of ICU4X. For terms of use, please see the file
+// called LICENSE at the top level of the ICU4X source tree
+// (online at: https://github.com/unicode-org/icu4x/blob/main/LICENSE ).
+
+use crate::*;
+use alloc::string::String;
+use alloc::vec::Vec;
+
+pub(crate) struct TestWriter {
+    pub(crate) string: String,
+    pub(crate) parts: Vec<(usize, usize, Part)>,
+}
+
+impl TestWriter {
+    pub(crate) fn finish(mut self) -> (String, Vec<(usize, usize, Part)>) {
+        // Sort by first open and last closed
+        self.parts
+            .sort_unstable_by_key(|(begin, end, _)| (*begin, end.wrapping_neg()));
+        (self.string, self.parts)
+    }
+}
+
+impl fmt::Write for TestWriter {
+    fn write_str(&mut self, s: &str) -> fmt::Result {
+        self.string.write_str(s)
+    }
+    fn write_char(&mut self, c: char) -> fmt::Result {
+        self.string.write_char(c)
+    }
+}
+
+impl PartsWrite for TestWriter {
+    type SubPartsWrite = Self;
+    fn with_part(
+        &mut self,
+        part: Part,
+        mut f: impl FnMut(&mut Self::SubPartsWrite) -> fmt::Result,
+    ) -> fmt::Result {
+        let start = self.string.len();
+        f(self)?;
+        let end = self.string.len();
+        if start < end {
+            self.parts.push((start, end, part));
+        }
+        Ok(())
+    }
+}
+
+#[allow(clippy::type_complexity)]
+pub fn writeable_to_parts_for_test<W: Writeable>(
+    writeable: &W,
+) -> (String, Vec<(usize, usize, Part)>) {
+    let mut writer = TestWriter {
+        string: alloc::string::String::new(),
+        parts: Vec::new(),
+    };
+    #[allow(clippy::expect_used)] // for test code
+    writeable
+        .write_to_parts(&mut writer)
+        .expect("String writer infallible");
+    writer.finish()
+}
+
+#[allow(clippy::type_complexity)]
+pub fn try_writeable_to_parts_for_test<W: TryWriteable>(
+    writeable: &W,
+) -> (String, Vec<(usize, usize, Part)>, Option<W::Error>) {
+    let mut writer = TestWriter {
+        string: alloc::string::String::new(),
+        parts: Vec::new(),
+    };
+    #[allow(clippy::expect_used)] // for test code
+    let result = writeable
+        .try_write_to_parts(&mut writer)
+        .expect("String writer infallible");
+    let (actual_str, actual_parts) = writer.finish();
+    (actual_str, actual_parts, result.err())
+}
-- 
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