1 files changed, 122 insertions, 0 deletions
diff --git a/third_party/rust/textwrap/benches/linear.rs b/third_party/rust/textwrap/benches/linear.rs
new file mode 100644
index 0000000000..cc805474d8
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+++ b/third_party/rust/textwrap/benches/linear.rs
@@ -0,0 +1,122 @@
+#![feature(test)]
+
+// The benchmarks here verify that the complexity grows as O(*n*)
+// where *n* is the number of characters in the text to be wrapped.
+
+extern crate test;
+extern crate rand;
+extern crate lipsum;
+extern crate textwrap;
+#[cfg(feature = "hyphenation")]
+extern crate hyphenation;
+
+use test::Bencher;
+#[cfg(feature = "hyphenation")]
+use hyphenation::Language;
+#[cfg(feature = "hyphenation")]
+use textwrap::Wrapper;
+use rand::XorShiftRng;
+use lipsum::MarkovChain;
+
+const LINE_LENGTH: usize = 60;
+
+/// Generate a lorem ipsum text with the given number of characters.
+fn lorem_ipsum(length: usize) -> String {
+    // The average word length in the lorem ipsum text is somewhere
+    // between 6 and 7. So we conservatively divide by 5 to have a
+    // long enough text that we can truncate below.
+    let rng = XorShiftRng::new_unseeded();
+    let mut chain = MarkovChain::new_with_rng(rng);
+    chain.learn(lipsum::LOREM_IPSUM);
+    chain.learn(lipsum::LIBER_PRIMUS);
+
+    let mut text = chain.generate_from(length / 5, ("Lorem", "ipsum"));
+    text.truncate(length);
+    text
+}
+
+#[bench]
+fn fill_100(b: &mut Bencher) {
+    let text = &lorem_ipsum(100);
+    b.iter(|| textwrap::fill(text, LINE_LENGTH))
+}
+
+#[bench]
+fn fill_200(b: &mut Bencher) {
+    let text = &lorem_ipsum(200);
+    b.iter(|| textwrap::fill(text, LINE_LENGTH))
+}
+
+#[bench]
+fn fill_400(b: &mut Bencher) {
+    let text = &lorem_ipsum(400);
+    b.iter(|| textwrap::fill(text, LINE_LENGTH))
+}
+
+#[bench]
+fn fill_800(b: &mut Bencher) {
+    let text = &lorem_ipsum(800);
+    b.iter(|| textwrap::fill(text, LINE_LENGTH))
+}
+
+
+#[bench]
+fn wrap_100(b: &mut Bencher) {
+    let text = &lorem_ipsum(100);
+    b.iter(|| textwrap::wrap(text, LINE_LENGTH))
+}
+
+#[bench]
+fn wrap_200(b: &mut Bencher) {
+    let text = &lorem_ipsum(200);
+    b.iter(|| textwrap::wrap(text, LINE_LENGTH))
+}
+
+#[bench]
+fn wrap_400(b: &mut Bencher) {
+    let text = &lorem_ipsum(400);
+    b.iter(|| textwrap::wrap(text, LINE_LENGTH))
+}
+
+#[bench]
+fn wrap_800(b: &mut Bencher) {
+    let text = &lorem_ipsum(800);
+    b.iter(|| textwrap::wrap(text, LINE_LENGTH))
+}
+
+
+#[bench]
+#[cfg(feature = "hyphenation")]
+fn hyphenation_fill_100(b: &mut Bencher) {
+    let text = &lorem_ipsum(100);
+    let corpus = hyphenation::load(Language::Latin).unwrap();
+    let wrapper = Wrapper::with_splitter(LINE_LENGTH, corpus);
+    b.iter(|| wrapper.fill(text))
+}
+
+#[bench]
+#[cfg(feature = "hyphenation")]
+fn hyphenation_fill_200(b: &mut Bencher) {
+    let text = &lorem_ipsum(200);
+    let corpus = hyphenation::load(Language::Latin).unwrap();
+    let wrapper = Wrapper::with_splitter(LINE_LENGTH, corpus);
+    b.iter(|| wrapper.fill(text))
+}
+
+#[bench]
+#[cfg(feature = "hyphenation")]
+fn hyphenation_fill_400(b: &mut Bencher) {
+    let text = &lorem_ipsum(400);
+    let corpus = hyphenation::load(Language::Latin).unwrap();
+    let wrapper = Wrapper::with_splitter(LINE_LENGTH, corpus);
+    b.iter(|| wrapper.fill(text))
+}
+
+#[bench]
+#[cfg(feature = "hyphenation")]
+fn hyphenation_fill_800(b: &mut Bencher) {
+    let text = &lorem_ipsum(800);
+    let corpus = hyphenation::load(Language::Latin).unwrap();
+    let wrapper = Wrapper::with_splitter(LINE_LENGTH, corpus);
+    b.iter(|| wrapper.fill(text))
+}