From 9835e2ae736235810b4ea1c162ca5e65c547e770 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sat, 18 May 2024 04:49:50 +0200
Subject: Merging upstream version 1.71.1+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 vendor/gix-ignore/src/parse.rs | 63 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 63 insertions(+)
 create mode 100644 vendor/gix-ignore/src/parse.rs

(limited to 'vendor/gix-ignore/src/parse.rs')

diff --git a/vendor/gix-ignore/src/parse.rs b/vendor/gix-ignore/src/parse.rs
new file mode 100644
index 000000000..11ceaabaf
--- /dev/null
+++ b/vendor/gix-ignore/src/parse.rs
@@ -0,0 +1,63 @@
+use bstr::ByteSlice;
+
+/// An iterator over line-wise ignore patterns parsed from a buffer.
+pub struct Lines<'a> {
+    lines: bstr::Lines<'a>,
+    line_no: usize,
+}
+
+impl<'a> Lines<'a> {
+    /// Create a new instance from `buf` to parse ignore patterns from.
+    pub fn new(buf: &'a [u8]) -> Self {
+        let bom = unicode_bom::Bom::from(buf);
+        Lines {
+            lines: buf[bom.len()..].lines(),
+            line_no: 0,
+        }
+    }
+}
+
+impl<'a> Iterator for Lines<'a> {
+    type Item = (gix_glob::Pattern, usize);
+
+    fn next(&mut self) -> Option<Self::Item> {
+        for line in self.lines.by_ref() {
+            self.line_no += 1;
+            if line.first() == Some(&b'#') {
+                continue;
+            }
+            match gix_glob::Pattern::from_bytes(truncate_non_escaped_trailing_spaces(line)) {
+                None => continue,
+                Some(pattern) => return Some((pattern, self.line_no)),
+            }
+        }
+        None
+    }
+}
+
+/// We always copy just because that's ultimately needed anyway, not because we always have to.
+fn truncate_non_escaped_trailing_spaces(buf: &[u8]) -> &[u8] {
+    let mut last_space_pos = None;
+    let mut bytes = buf.iter().enumerate();
+    while let Some((pos, b)) = bytes.next() {
+        match *b {
+            b' ' => {
+                last_space_pos.get_or_insert(pos);
+                continue;
+            }
+            b'\\' => {
+                if bytes.next().is_none() {
+                    return buf;
+                }
+            }
+            _ => {}
+        }
+        last_space_pos = None;
+    }
+
+    if let Some(pos) = last_space_pos {
+        &buf[..pos]
+    } else {
+        buf
+    }
+}
-- 
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