make timezone parsing case insensitive

Signed-off-by: Petros Angelatos <petrosagg@gmail.com>

Cargo.toml

@@ -13,7 +13,8 @@ license = "MIT/Apache-2.0"
 [dependencies]
 chrono = { version = "0.4", default-features = false }
 serde = { version = "1", optional = true, default-features = false }
-phf = { version = "0.10", default-features = false }
+phf = { version = "0.10", default-features = false, features = ["uncased"] }
+uncased = { version = "0.9", default-features = false }
 
 [features]
 default = ["std"]

chrono-tz-build/Cargo.toml

@@ -16,5 +16,6 @@ filter-by-regex = ["regex"]
 [dependencies]
 parse-zoneinfo = { version = "0.3" }
 regex = { default-features = false, version = "1", optional = true }
-phf_codegen = "0.10"
-phf = "0.10"
+phf_codegen = { version = "0.10", default-features = false }
+phf = { version = "0.10", features = ["uncased"] }
+uncased = "0.9"

chrono-tz-build/src/lib.rs

@@ -14,6 +14,8 @@ use parse_zoneinfo::table::{Table, TableBuilder};
 use parse_zoneinfo::transitions::FixedTimespan;
 use parse_zoneinfo::transitions::TableTransitions;
 
+use uncased::UncasedStr;
+
 /// The name of the environment variable which possibly holds the filter regex.
 const FILTER_ENV_VAR_NAME: &str = "CHRONO_TZ_TIMEZONE_FILTER";
 
@@ -70,6 +72,7 @@ fn write_timezone_file(timezone_file: &mut File, table: &Table) -> io::Result<()
     let zones = table.zonesets.keys().chain(table.links.keys()).collect::<BTreeSet<_>>();
     writeln!(timezone_file, "use core::fmt::{{self, Debug, Display, Formatter}};",)?;
     writeln!(timezone_file, "use core::str::FromStr;\n",)?;
+    writeln!(timezone_file, "use uncased::UncasedStr;\n",)?;
     writeln!(
         timezone_file,
         "use ::timezone_impl::{{TimeSpans, FixedTimespanSet, FixedTimespan}};\n",
@@ -96,9 +99,14 @@ fn write_timezone_file(timezone_file: &mut File, table: &Table) -> io::Result<()
 
     let mut map = phf_codegen::Map::new();
     for zone in &zones {
-        map.entry(zone, &format!("Tz::{}", convert_bad_chars(zone)));
+        map.entry(UncasedStr::new(zone), &format!("Tz::{}", convert_bad_chars(zone)));
     }
-    writeln!(timezone_file, "static TIMEZONES: ::phf::Map<&'static str, Tz> = \n{};", map.build())?;
+    writeln!(
+        timezone_file,
+        "static TIMEZONES: ::phf::Map<&'static UncasedStr, Tz> = \n{};",
+        // FIXME(petrosagg): remove this once rust-phf/rust-phf#232 is released
+        map.build().to_string().replace("::std::mem::transmute", "::core::mem::transmute")
+    )?;
 
     writeln!(
         timezone_file,
@@ -109,9 +117,9 @@ fn write_timezone_file(timezone_file: &mut File, table: &Table) -> io::Result<()
     type Err = &'static str;
     fn from_str(s: &str) -> Result<Self, Self::Err> {{
         #[cfg(feature = \"std\")]
-        return TIMEZONES.get(s).cloned().ok_or_else(|| format!(\"'{{}}' is not a valid timezone\", s));
+        return TIMEZONES.get(s.into()).cloned().ok_or_else(|| format!(\"'{{}}' is not a valid timezone\", s));
         #[cfg(not(feature = \"std\"))]
-        return TIMEZONES.get(s).cloned().ok_or(\"received invalid timezone\");
+        return TIMEZONES.get(s.into()).cloned().ok_or(\"received invalid timezone\");
     }}
 }}\n"
     )?;

src/lib.rs

@@ -158,6 +158,7 @@ extern crate std as core;
 
 extern crate chrono;
 extern crate phf;
+extern crate uncased;
 
 #[cfg(feature = "serde")]
 mod serde;