1 files changed, 39 insertions, 0 deletions
diff --git a/crates/shirabe-php-shim/src/filter.rs b/crates/shirabe-php-shim/src/filter.rs
new file mode 100644
index 0000000..a23752b
--- /dev/null
+++ b/crates/shirabe-php-shim/src/filter.rs
@@ -0,0 +1,39 @@
+use crate::PhpMixed;
+use indexmap::IndexMap;
+
+pub const FILTER_VALIDATE_EMAIL: i64 = 274;
+
+pub const FILTER_VALIDATE_BOOLEAN: i64 = 258;
+pub const FILTER_VALIDATE_URL: i64 = 273;
+pub const FILTER_VALIDATE_IP: i64 = 275;
+pub const FILTER_VALIDATE_INT: i64 = 257;
+
+pub fn filter_var(value: &str, filter: i64) -> bool {
+    match filter {
+        // Without FILTER_NULL_ON_FAILURE, php_filter_boolean trims surrounding
+        // whitespace, lowercases, and yields true only for "1"/"true"/"on"/"yes";
+        // every other input (including the "0"/"false"/"off"/"no"/"" set) yields
+        // false.
+        FILTER_VALIDATE_BOOLEAN => {
+            let trimmed = value.trim_matches([' ', '\t', '\n', '\r', '\0', '\x0B']);
+            matches!(
+                trimmed.to_ascii_lowercase().as_str(),
+                "1" | "true" | "on" | "yes"
+            )
+        }
+        // TODO(phase-c): PHP's FILTER_VALIDATE_URL parses with php_url_parse_ex and
+        // additionally validates the host as a domain/IPv6 literal. reqwest::Url
+        // (WHATWG/RFC 3986) is stricter on some inputs and more lenient on others,
+        // so this is not a byte-for-byte compatible validator.
+        FILTER_VALIDATE_URL => reqwest::Url::parse(value).is_ok(),
+        _ => todo!(),
+    }
+}
+
+pub fn filter_var_with_options(
+    _value: &str,
+    _filter: i64,
+    _options: &IndexMap<String, PhpMixed>,
+) -> PhpMixed {
+    todo!()
+}