refactor(preg): replace Preg::split*() with shim preg_split*()

preg_split2()'s limit was always -1 and its flags were always either 0 or
PREG_SPLIT_DELIM_CAPTURE alone, so both arguments are gone: the shim now
exposes preg_split() and preg_split_delim_capture() over a shared
preg_split_impl(). That leaves Preg::split()/split4() as bare
pass-throughs, so callers use the shim functions directly and the wrappers
are dropped along with the now-unreferenced PREG_SPLIT_* constants.

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

1 files changed, 2 insertions, 7 deletions

diff --git a/crates/shirabe/tests/installer_test.rs b/crates/shirabe/tests/installer_test.rs
index a4c04c00..7b86be89 100644
--- a/crates/shirabe/tests/installer_test.rs
+++ b/crates/shirabe/tests/installer_test.rs
@@ -43,7 +43,7 @@ use shirabe::util::platform::Platform;
 use shirabe::util::process_executor::ProcessExecutor;
 use shirabe_class_map_generator::class_map::ClassMap;
 use shirabe_pcre::preg::Preg;
-use shirabe_php_shim::{PREG_SPLIT_DELIM_CAPTURE, PhpMixed, php_regex};
+use shirabe_php_shim::{PhpMixed, php_regex, preg_split_delim_capture};
 use shirabe_semver::VersionParser;
 use shirabe_semver::constraint::AnyConstraint;
 use shirabe_symfony_console::command::Command as SymfonyCommand;
@@ -580,12 +580,7 @@ fn read_test_file(
     fixtures_dir: &std::path::Path,
 ) -> IndexMap<String, String> {
     let contents = std::fs::read_to_string(file).unwrap();
-    let tokens = Preg::split4(
-        php_regex!(r"#(?:^|\n*)--([A-Z-]+)--\n#"),
-        &contents,
-        -1,
-        PREG_SPLIT_DELIM_CAPTURE,
-    );
+    let tokens = preg_split_delim_capture(php_regex!(r"#(?:^|\n*)--([A-Z-]+)--\n#"), &contents);
 
     let section_info: [(&str, bool); 13] = [
         ("TEST", true),