Merge pull request #15 from blackbeam/xml

Implement MARC XML

.github/workflows/test_and_check.yml

@@ -16,7 +16,7 @@ jobs:
       uses: actions-rs/cargo@v1
       with:
         command: test
-        args: --workspace --verbose
+        args: --features default,xml --verbose
   format_check:
     runs-on: ubuntu-latest
     steps:

Cargo.toml

@@ -18,3 +18,12 @@ path = "src/lib.rs"
 [features]
 default = []
 nightly = []
+xml = ["dep:xml-rs"]
+
+[dependencies]
+xml-rs = { version = "0.8", optional = true }
+
+[package.metadata.docs.rs]
+rustdoc-args = ["--cfg", "docsrs"]
+no-default-features = true
+features = ["default", "xml"]

src/errors.rs

@@ -29,6 +29,9 @@ pub enum Error {
     UnexpectedSubfieldEnd,
     NonUnicodeSequence(Pointer),
     UnknownCharacterCodingScheme(u8),
+    Utf8Error(std::str::Utf8Error),
+    #[cfg(feature = "xml")]
+    XmlError(xml::writer::Error),
     Io(io::ErrorKind),
 }
 
@@ -65,14 +68,43 @@ impl fmt::Display for Error {
                 }
             },
             Error::Io(err) => write!(f, "IO error: {:?}", err),
+            Error::Utf8Error(err) => write!(f, "UTF8 error: {}", err),
+            #[cfg(feature = "xml")]
+            Error::XmlError(err) => write!(f, "XML error: {}", err),
         }
     }
 }
 
-impl ::std::error::Error for Error {}
+impl ::std::error::Error for Error {
+    fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
+        match self {
+            Error::UnexpectedByteInDecNum(_)
+            | Error::FieldTooLarge(_)
+            | Error::RecordTooLarge(_)
+            | Error::RecordTooShort(_)
+            | Error::UnexpectedEofInDecNum
+            | Error::UnexpectedEof
+            | Error::UnexpectedEofInDirectory
+            | Error::NoRecordTerminator
+            | Error::UnexpectedSubfieldEnd
+            | Error::NonUnicodeSequence(_)
+            | Error::UnknownCharacterCodingScheme(_)
+            | Error::Io(_) => None,
+            Error::Utf8Error(ref e) => Some(e as &_),
+            #[cfg(feature = "xml")]
+            Error::XmlError(ref e) => Some(e as &_),
+        }
+    }
+}
 
 impl From<io::Error> for Error {
     fn from(err: io::Error) -> Error {
         Error::Io(err.kind())
     }
 }
+
+impl From<std::str::Utf8Error> for Error {
+    fn from(err: std::str::Utf8Error) -> Error {
+        Error::Utf8Error(err)
+    }
+}

src/lib.rs

@@ -112,9 +112,14 @@ mod identifier;
 mod indicator;
 mod misc;
 mod tag;
+#[cfg(feature = "xml")]
+mod xml;
 
 pub use errors::*;
 
+#[cfg(feature = "xml")]
+#[doc(inline)]
+pub use crate::xml::MarcXml;
 #[doc(inline)]
 pub use field::fields::Fields;
 #[doc(inline)]