refactor(preg): drop unused flags and offset of preg_match_all2()

Every caller reached preg_match_all2() through Preg::match_all5(), which
always passed flags = PREG_UNMATCHED_AS_NULL and offset = 0. Inline those
constants and make match_all5() private, since the two public wrappers are
its only callers.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

2 files changed, 7 insertions, 25 deletions

diff --git a/crates/shirabe-pcre/src/preg.rs b/crates/shirabe-pcre/src/preg.rs
index e197c874..95697e83 100644
--- a/crates/shirabe-pcre/src/preg.rs
+++ b/crates/shirabe-pcre/src/preg.rs
@@ -57,7 +57,7 @@ impl Preg {
     }
 
     pub fn match_all(pattern: impl PregPattern, subject: &str) -> usize {
-        Self::match_all5(pattern, subject, None, 0, 0)
+        Self::match_all5(pattern, subject, None)
     }
 
     pub fn match_all3(
@@ -65,27 +65,16 @@ impl Preg {
         subject: &str,
         matches: Option<&mut IndexMap<CaptureKey, Vec<String>>>,
     ) -> usize {
-        Self::match_all5(pattern, subject, matches, 0, 0)
+        Self::match_all5(pattern, subject, matches)
     }
 
-    pub fn match_all5(
+    fn match_all5(
         pattern: impl PregPattern,
         subject: &str,
         matches: Option<&mut IndexMap<CaptureKey, Vec<String>>>,
-        flags: i64,
-        offset: usize,
     ) -> usize {
-        Self::check_offset_capture(flags, "matchAllWithOffsets");
-        Self::check_set_order(flags);
-
         let mut internal: IndexMap<CaptureKey, Vec<Option<String>>> = IndexMap::new();
-        let result = preg_match_all2(
-            pattern,
-            subject,
-            &mut internal,
-            flags | PREG_UNMATCHED_AS_NULL,
-            offset,
-        );
+        let result = preg_match_all2(pattern, subject, &mut internal);
 
         if let Some(out) = matches {
             *out = null_to_empty_match_all(internal);
@@ -266,7 +255,7 @@ impl Preg {
         subject: &str,
         matches: Option<&mut IndexMap<CaptureKey, Vec<String>>>,
     ) -> bool {
-        Self::match_all5(pattern, subject, matches, 0, 0) > 0
+        Self::match_all5(pattern, subject, matches) > 0
     }
 
     pub fn is_match_all_with_offsets3(
diff --git a/crates/shirabe-php-shim/src/preg.rs b/crates/shirabe-php-shim/src/preg.rs
index 727fc149..42a3ecec 100644
--- a/crates/shirabe-php-shim/src/preg.rs
+++ b/crates/shirabe-php-shim/src/preg.rs
@@ -122,27 +122,20 @@ pub fn preg_match_all2(
     pattern: impl PregPattern,
     subject: &str,
     matches: &mut indexmap::IndexMap<CaptureKey, Vec<Option<String>>>,
-    flags: i64,
-    offset: usize,
 ) -> usize {
     let __resolved = pattern.resolve();
     let (re, _anchored) = __resolved.parts();
-    let unmatched_as_null = flags & PREG_UNMATCHED_AS_NULL != 0;
     let group_count = re.captures_len();
     let names: Vec<Option<&str>> = re.capture_names().collect();
 
     // PREG_PATTERN_ORDER: one column per group, one row per match occurrence.
     let mut groups: Vec<Vec<Option<String>>> = vec![Vec::new(); group_count];
     let mut count = 0;
-    for caps in re.captures_iter(&subject[offset..]) {
+    for caps in re.captures_iter(subject) {
         count += 1;
         for (g, column) in groups.iter_mut().enumerate() {
             let value = caps.get(g).map(|m| m.as_str().to_string());
-            column.push(if unmatched_as_null {
-                value
-            } else {
-                Some(value.unwrap_or_default())
-            });
+            column.push(value);
         }
     }