fix formatting for arrays after #156

phf_codegen/test/build.rs

@@ -3,75 +3,88 @@ extern crate unicase;
 
 use std::env;
 use std::fs::File;
-use std::io::{BufWriter, Write};
+use std::io::{self, BufWriter, Write};
 use std::path::Path;
 
 use unicase::UniCase;
 
-fn main() {
+fn main() -> io::Result<()> {
     let file = Path::new(&env::var("OUT_DIR").unwrap()).join("codegen.rs");
-    let mut file = BufWriter::new(File::create(&file).unwrap());
+    let mut file = BufWriter::new(File::create(&file)?);
 
-    write!(&mut file, "static MAP: ::phf::Map<u32, &'static str> = ").unwrap();
+    write!(&mut file, "static MAP: ::phf::Map<u32, &'static str> = ")?;
     phf_codegen::Map::new()
         .entry(1u32, "\"a\"")
         .entry(2u32, "\"b\"")
         .entry(3u32, "\"c\"")
-        .build(&mut file)
-        .unwrap();
-    write!(&mut file, ";\n").unwrap();
+        .build(&mut file)?;
+    write!(&mut file, ";\n")?;
 
-    write!(&mut file, "static SET: ::phf::Set<u32> = ").unwrap();
+    write!(&mut file, "static SET: ::phf::Set<u32> = ")?;
     phf_codegen::Set::new()
         .entry(1u32)
         .entry(2u32)
         .entry(3u32)
-        .build(&mut file)
-        .unwrap();
-    write!(&mut file, ";\n").unwrap();
+        .build(&mut file)?;
+    write!(&mut file, ";\n")?;
 
-    write!(&mut file, "static ORDERED_MAP: ::phf::OrderedMap<u32, &'static str> = ").unwrap();
+    write!(&mut file, "static ORDERED_MAP: ::phf::OrderedMap<u32, &'static str> = ")?;
     phf_codegen::OrderedMap::new()
         .entry(1u32, "\"a\"")
         .entry(2u32, "\"b\"")
         .entry(3u32, "\"c\"")
-        .build(&mut file)
-        .unwrap();
-    write!(&mut file, ";\n").unwrap();
+        .build(&mut file)?;
+    write!(&mut file, ";\n")?;
 
-    write!(&mut file, "static ORDERED_SET: ::phf::OrderedSet<u32> = ").unwrap();
+    write!(&mut file, "static ORDERED_SET: ::phf::OrderedSet<u32> = ")?;
     phf_codegen::OrderedSet::new()
         .entry(1u32)
         .entry(2u32)
         .entry(3u32)
-        .build(&mut file)
-        .unwrap();
-    write!(&mut file, ";\n").unwrap();
+        .build(&mut file)?;
+    write!(&mut file, ";\n")?;
 
-    write!(&mut file, "static STR_KEYS: ::phf::Map<&'static str, u32> = ").unwrap();
+    write!(&mut file, "static STR_KEYS: ::phf::Map<&'static str, u32> = ")?;
     phf_codegen::Map::new()
         .entry("a", "1")
         .entry("b", "2")
         .entry("c", "3")
-        .build(&mut file)
-        .unwrap();
-    write!(&mut file, ";\n").unwrap();
+        .build(&mut file)?;
+    write!(&mut file, ";\n")?;
 
     write!(&mut file, "static UNICASE_MAP: ::phf::Map<::unicase::UniCase<&'static str>, \
-                                                      &'static str> = ").unwrap();
+                                                      &'static str> = ")?;
     phf_codegen::Map::new()
         .entry(UniCase::new("abc"), "\"a\"")
         .entry(UniCase::new("DEF"), "\"b\"")
-        .build(&mut file)
-        .unwrap();
-    write!(&mut file, ";\n").unwrap();
+        .build(&mut file)?;
+    write!(&mut file, ";\n")?;
 
     //u32 is used here purely for a type that impls `Hash+PhfHash+Eq+fmt::Debug`, but is not required for the empty test itself
-    write!(&mut file, "static EMPTY: ::phf::Map<u32, u32> = ").unwrap();
-    phf_codegen::Map::<u32>::new().build(&mut file).unwrap();
-    write!(&mut file, ";\n").unwrap();
+    write!(&mut file, "static EMPTY: ::phf::Map<u32, u32> = ")?;
+    phf_codegen::Map::<u32>::new().build(&mut file)?;
+    write!(&mut file, ";\n")?;
 
-    write!(&mut file, "static EMPTY_ORDERED: ::phf::OrderedMap<u32, u32> = ").unwrap();
-    phf_codegen::OrderedMap::<u32>::new().build(&mut file).unwrap();
-    write!(&mut file, ";\n").unwrap();
+    write!(&mut file, "static EMPTY_ORDERED: ::phf::OrderedMap<u32, u32> = ")?;
+    phf_codegen::OrderedMap::<u32>::new().build(&mut file)?;
+    write!(&mut file, ";\n")?;
+
+    write!(&mut file, "static ARRAY_KEYS: ::phf::Map<[u8; 3], u32> = ")?;
+    phf_codegen::Map::<[u8; 3]>::new()
+        .entry(*b"foo", "0")
+        .entry(*b"bar", "1")
+        .entry(*b"baz", "2")
+        .build(&mut file)?;
+
+    writeln!(&mut file, ";")?;
+
+    write!(&mut file, "static BYTE_STR_KEYS: ::phf::Map<&[u8], u32> = ")?;
+    // key type required here as it will infer `&'static [u8; 3]` instead
+    phf_codegen::Map::<&[u8]>::new()
+        .entry(b"foo", "0")
+        .entry(b"bar", "1")
+        .entry(b"baz", "2")
+        .entry(b"quux", "3")
+        .build(&mut file)?;
+    writeln!(&mut file, ";")
 }

phf_codegen/test/src/lib.rs

@@ -53,6 +53,22 @@ mod test {
         assert!(!UNICASE_MAP.contains_key(&UniCase::new("XyZ")));
     }
 
+    #[test]
+    fn array_keys() {
+        assert_eq!(0, ARRAY_KEYS[b"foo"]);
+        assert_eq!(1, ARRAY_KEYS[b"bar"]);
+        assert_eq!(2, ARRAY_KEYS[b"baz"]);
+    }
+
+    #[test]
+    fn byte_str_keys() {
+        // slicing is required unless the key type is fixed-size
+        assert_eq!(0, BYTE_STR_KEYS[&b"foo"[..]]);
+        assert_eq!(1, BYTE_STR_KEYS[&b"bar"[..]]);
+        assert_eq!(2, BYTE_STR_KEYS[&b"baz"[..]]);
+        assert_eq!(3, BYTE_STR_KEYS[&b"quux"[..]]);
+    }
+
      #[test]
     fn empty_map() {
         assert_eq!(None, EMPTY.get(&1));
@@ -63,4 +79,5 @@ mod test {
         assert_eq!(None, EMPTY_ORDERED.get(&1));
     }
 
+
 }

phf_shared/src/lib.rs

@@ -212,6 +212,11 @@ impl PhfHash for char {
     }
 }
 
+// minimize duplicated code since formatting drags in quite a bit
+fn fmt_array(array: &[u8], f: &mut fmt::Formatter) -> fmt::Result {
+    write!(f, "{:?}", array)
+}
+
 macro_rules! array_impl(
     ($t:ty, $n:expr) => (
         impl PhfHash for [$t; $n] {
@@ -223,8 +228,7 @@ macro_rules! array_impl(
 
         impl FmtConst for [$t; $n] {
             fn fmt_const(&self, f: &mut fmt::Formatter) -> fmt::Result {
-                // delegate to the slice impl to minimize duplicated code
-                self[..].fmt_const(f)
+                fmt_array(self, f)
             }
         }
     )