Merge pull request #6 from StripedCats/features/complete-error-display

Fill unimplemented error enum fields (trait Display)

src/error.rs

@@ -55,16 +55,50 @@ impl de::Error for Error {
 
 impl Display for Error {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        use Error::*;
+
         match self {
-            Error::Syntax(msg) => write!(
+            Syntax(msg) => write!(
                 f,
                 "Input text does not have a valid Gura format. Parsing failed with error \"{}\"",
                 msg
             ),
-            Error::Message(msg) => write!(f, "{}", msg),
-            Error::Eof => f.write_str("Unexpected end of input"),
-            Error::UnitNotSupported => f.write_str("Unit values are not supported in Gura"),
-            _ => unimplemented!(),
+            Message(msg) => write!(f, "{}", msg),
+            Eof => f.write_str("Unexpected end of input"),
+            UnitNotSupported => f.write_str("Unit values are not supported in Gura"),
+
+            ExpectedBytes   => f.write_str("Expected byte sequence"),
+            ExpectedBoolean => f.write_str("Expected boolean"),
+            ExpectedInteger => f.write_str("Expected integer"),
+            ExpectedFloat   => f.write_str(
+                concat!(
+                    "Expected float: perhaps you forgot decimal fractional part",
+                    " (No implicit coversion between int and float, ",
+                    "see https://gura.netlify.app/docs/spec#float)"
+                )
+            ),
+            ExpectedChar     => f.write_str("Expected char"),
+            ExpectedString   => f.write_str("Expected string"),
+            ExpectedNull     => f.write_str("Expected null value"),
+            ExpectedArray    => f.write_str("Expected array"),
+            ExpectedArrayEnd => f.write_str("Expected array end"),
+
+            ExpectedMap      => f.write_str("Expected map"),
+            ExpectedMapColon => f.write_str("Expected colon at map"),
+            ExpectedMapComma => f.write_str("Expected comma at map"),
+            ExpectedMapEnd   => f.write_str("Expected map end"),
+
+            ExpectedEnum     => f.write_str("Expected enum value"),
+
+            ExpectedObjectValue => f.write_str("Expected not empty object block"),
+            TrailingCharacters  => f.write_str("Invalid trailing characters"),
+
+            ExpectedUnitVariant => f.write_str("Expected unit variant at enum"),
+
+            ExpectedArrayComma  => f.write_str("Expected comma at array"),
+
+            InvalidType => f.write_str("Invalid type"),
+            ExpectedIdentifier => f.write_str("Expected identifier")
         }
     }
 }