Initial vendor packages

Signed-off-by: Valentin Popov <valentin@popov.link>

vendor/anstyle-parse/benches/parse.rs

@@ -0,0 +1,169 @@
+use criterion::{black_box, Criterion};
+
+use anstyle_parse::*;
+
+struct BenchDispatcher;
+impl Perform for BenchDispatcher {
+    fn print(&mut self, c: char) {
+        black_box(c);
+    }
+
+    fn execute(&mut self, byte: u8) {
+        black_box(byte);
+    }
+
+    fn hook(&mut self, params: &Params, intermediates: &[u8], ignore: bool, c: u8) {
+        black_box((params, intermediates, ignore, c));
+    }
+
+    fn put(&mut self, byte: u8) {
+        black_box(byte);
+    }
+
+    fn osc_dispatch(&mut self, params: &[&[u8]], bell_terminated: bool) {
+        black_box((params, bell_terminated));
+    }
+
+    fn csi_dispatch(&mut self, params: &Params, intermediates: &[u8], ignore: bool, c: u8) {
+        black_box((params, intermediates, ignore, c));
+    }
+
+    fn esc_dispatch(&mut self, intermediates: &[u8], ignore: bool, byte: u8) {
+        black_box((intermediates, ignore, byte));
+    }
+}
+
+#[derive(Default)]
+struct Strip(String);
+impl Strip {
+    fn with_capacity(capacity: usize) -> Self {
+        Self(String::with_capacity(capacity))
+    }
+}
+impl Perform for Strip {
+    fn print(&mut self, c: char) {
+        self.0.push(c);
+    }
+
+    fn execute(&mut self, byte: u8) {
+        if byte.is_ascii_whitespace() {
+            self.0.push(byte as char);
+        }
+    }
+}
+
+fn strip_str(content: &str) -> String {
+    use anstyle_parse::state::state_change;
+    use anstyle_parse::state::Action;
+    use anstyle_parse::state::State;
+
+    #[inline]
+    fn is_utf8_continuation(b: u8) -> bool {
+        matches!(b, 0x80..=0xbf)
+    }
+
+    #[inline]
+    fn is_printable(action: Action, byte: u8) -> bool {
+        action == Action::Print
+                    || action == Action::BeginUtf8
+                    // since we know the input is valid UTF-8, the only thing  we can do with
+                    // continuations is to print them
+                    || is_utf8_continuation(byte)
+                    || (action == Action::Execute && byte.is_ascii_whitespace())
+    }
+
+    let mut stripped = Vec::with_capacity(content.len());
+
+    let mut bytes = content.as_bytes();
+    while !bytes.is_empty() {
+        let offset = bytes.iter().copied().position(|b| {
+            let (_next_state, action) = state_change(State::Ground, b);
+            !is_printable(action, b)
+        });
+        let (printable, next) = bytes.split_at(offset.unwrap_or(bytes.len()));
+        stripped.extend(printable);
+        bytes = next;
+
+        let mut state = State::Ground;
+        let offset = bytes.iter().copied().position(|b| {
+            let (next_state, action) = state_change(state, b);
+            if next_state != State::Anywhere {
+                state = next_state;
+            }
+            is_printable(action, b)
+        });
+        let (_, next) = bytes.split_at(offset.unwrap_or(bytes.len()));
+        bytes = next;
+    }
+
+    String::from_utf8(stripped).unwrap()
+}
+
+fn parse(c: &mut Criterion) {
+    for (name, content) in [
+        #[cfg(feature = "utf8")]
+        ("demo.vte", &include_bytes!("../tests/demo.vte")[..]),
+        ("rg_help.vte", &include_bytes!("../tests/rg_help.vte")[..]),
+        ("rg_linus.vte", &include_bytes!("../tests/rg_linus.vte")[..]),
+        (
+            "state_changes",
+            &b"\x1b]2;X\x1b\\ \x1b[0m \x1bP0@\x1b\\"[..],
+        ),
+    ] {
+        // Make sure the comparison is fair
+        if let Ok(content) = std::str::from_utf8(content) {
+            let mut stripped = Strip::with_capacity(content.len());
+            let mut parser = Parser::<DefaultCharAccumulator>::new();
+            for byte in content.as_bytes() {
+                parser.advance(&mut stripped, *byte);
+            }
+            assert_eq!(stripped.0, strip_str(content));
+        }
+
+        let mut group = c.benchmark_group(name);
+        group.bench_function("advance", |b| {
+            b.iter(|| {
+                let mut dispatcher = BenchDispatcher;
+                let mut parser = Parser::<DefaultCharAccumulator>::new();
+
+                for byte in content {
+                    parser.advance(&mut dispatcher, *byte);
+                }
+            })
+        });
+        group.bench_function("advance_strip", |b| {
+            b.iter(|| {
+                let mut stripped = Strip::with_capacity(content.len());
+                let mut parser = Parser::<DefaultCharAccumulator>::new();
+
+                for byte in content {
+                    parser.advance(&mut stripped, *byte);
+                }
+
+                black_box(stripped.0)
+            })
+        });
+        group.bench_function("state_change", |b| {
+            b.iter(|| {
+                let mut state = anstyle_parse::state::State::default();
+                for byte in content {
+                    let (next_state, action) = anstyle_parse::state::state_change(state, *byte);
+                    state = next_state;
+                    black_box(action);
+                }
+            })
+        });
+        if let Ok(content) = std::str::from_utf8(content) {
+            group.bench_function("state_change_strip_str", |b| {
+                b.iter(|| {
+                    let stripped = strip_str(content);
+
+                    black_box(stripped)
+                })
+            });
+        }
+    }
+}
+
+criterion::criterion_group!(benches, parse);
+criterion::criterion_main!(benches);