parse-zoneinfo: replace rule parser with simple state machine

parse-zoneinfo/Cargo.toml

@@ -13,3 +13,6 @@ keywords = ["date", "time", "timezone", "zone", "calendar"]
 version = "1.3.1"
 default-features = false
 features = ["std", "unicode-perl"]
+
+[dev-dependencies]
+insta = "1.38"

parse-zoneinfo/tests/snapshot.rs

@@ -0,0 +1,30 @@
+use std::error::Error;
+
+use insta::assert_debug_snapshot;
+
+use parse_zoneinfo::line::{Line, LineParser};
+use parse_zoneinfo::FILES;
+
+#[ignore]
+#[test]
+fn test_parse() -> Result<(), Box<dyn Error + Send + Sync + 'static>> {
+    let mut files = vec![];
+    let parser = LineParser::default();
+    for file in FILES {
+        let path = format!("../chrono-tz/tz/{}", file);
+        let text = std::fs::read_to_string(&path)?;
+        let mut lines = vec![];
+        for ln in text.lines() {
+            dbg!(ln);
+            match parser.parse_str(ln)? {
+                Line::Space => continue,
+                ln => lines.push(format!("{:?}", ln)),
+            }
+        }
+
+        files.push((file, lines));
+    }
+
+    assert_debug_snapshot!(files);
+    Ok(())
+}