feat(pcre): implement Preg class

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

1 files changed, 36 insertions, 0 deletions

diff --git a/crates/shirabe-external-packages/src/composer/pcre/pcre_exception.rs b/crates/shirabe-external-packages/src/composer/pcre/pcre_exception.rs
new file mode 100644
index 0000000..4ebe2c3
--- /dev/null
+++ b/crates/shirabe-external-packages/src/composer/pcre/pcre_exception.rs
@@ -0,0 +1,36 @@
+//! ref: composer/vendor/composer/pcre/src/PcreException.php
+
+use super::preg::{preg_last_error, preg_last_error_msg};
+
+#[derive(Debug)]
+pub struct PcreException(pub shirabe_php_shim::RuntimeException);
+
+impl PcreException {
+    pub fn from_function(function: &str, pattern: &str) -> PcreException {
+        let code = preg_last_error();
+
+        PcreException(shirabe_php_shim::RuntimeException {
+            message: format!(
+                "{}(): failed executing \"{}\": {}",
+                function,
+                pattern,
+                Self::pcre_last_error_message(code)
+            ),
+            code,
+        })
+    }
+
+    // Modern PHP always provides preg_last_error_msg(), so the legacy fallbacks
+    // that scanned the pcre constants are not reproduced.
+    fn pcre_last_error_message(_code: i64) -> String {
+        preg_last_error_msg()
+    }
+}
+
+impl std::fmt::Display for PcreException {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "{}", self.0)
+    }
+}
+
+impl std::error::Error for PcreException {}