| use std::fmt::Display; |
| use std::io::Write; |
| |
| use serde::ser::{self, Impossible, Serialize}; |
| |
| use self::var::{Map, Struct}; |
| use crate::error::{Error, Result}; |
| |
| mod var; |
| |
| /// A convenience method for serializing some object to a buffer. |
| /// |
| /// # Examples |
| /// |
| /// ```rust |
| /// # #[macro_use] |
| /// # extern crate serde_derive; |
| /// # extern crate serde; |
| /// # extern crate serde_xml_rs; |
| /// # use serde_xml_rs::to_writer; |
| /// #[derive(Serialize)] |
| /// struct Person { |
| /// name: String, |
| /// age: u32, |
| /// } |
| /// |
| /// # fn main() { |
| /// let mut buffer = Vec::new(); |
| /// let joe = Person {name: "Joe".to_string(), age: 42}; |
| /// |
| /// to_writer(&mut buffer, &joe).unwrap(); |
| /// |
| /// let serialized = String::from_utf8(buffer).unwrap(); |
| /// println!("{}", serialized); |
| /// # } |
| /// ``` |
| pub fn to_writer<W: Write, S: Serialize>(writer: W, value: &S) -> Result<()> { |
| let mut ser = Serializer::new(writer); |
| value.serialize(&mut ser) |
| } |
| |
| /// A convenience method for serializing some object to a string. |
| /// |
| /// # Examples |
| /// |
| /// ```rust |
| /// # #[macro_use] |
| /// # extern crate serde_derive; |
| /// # extern crate serde; |
| /// # extern crate serde_xml_rs; |
| /// # use serde_xml_rs::to_string; |
| /// #[derive(Serialize)] |
| /// struct Person { |
| /// name: String, |
| /// age: u32, |
| /// } |
| /// |
| /// # fn main() { |
| /// |
| /// let joe = Person {name: "Joe".to_string(), age: 42}; |
| /// let serialized = to_string(&joe).unwrap(); |
| /// println!("{}", serialized); |
| /// # } |
| /// ``` |
| pub fn to_string<S: Serialize>(value: &S) -> Result<String> { |
| // Create a buffer and serialize our nodes into it |
| let mut writer = Vec::with_capacity(128); |
| to_writer(&mut writer, value)?; |
| |
| // We then check that the serialized string is the same as what we expect |
| let string = String::from_utf8(writer)?; |
| Ok(string) |
| } |
| |
| /// An XML `Serializer`. |
| pub struct Serializer<W> |
| where |
| W: Write, |
| { |
| writer: W, |
| } |
| |
| impl<W> Serializer<W> |
| where |
| W: Write, |
| { |
| pub fn new(writer: W) -> Self { |
| Self { writer: writer } |
| } |
| |
| fn write_primitive<P: Display>(&mut self, primitive: P) -> Result<()> { |
| write!(self.writer, "{}", primitive)?; |
| Ok(()) |
| } |
| |
| fn write_wrapped<S: Serialize>(&mut self, tag: &str, value: S) -> Result<()> { |
| write!(self.writer, "<{}>", tag)?; |
| value.serialize(&mut *self)?; |
| write!(self.writer, "</{}>", tag)?; |
| Ok(()) |
| } |
| } |
| |
| #[allow(unused_variables)] |
| impl<'w, W> ser::Serializer for &'w mut Serializer<W> |
| where |
| W: Write, |
| { |
| type Ok = (); |
| type Error = Error; |
| |
| type SerializeSeq = Impossible<Self::Ok, Self::Error>; |
| type SerializeTuple = Impossible<Self::Ok, Self::Error>; |
| type SerializeTupleStruct = Impossible<Self::Ok, Self::Error>; |
| type SerializeTupleVariant = Impossible<Self::Ok, Self::Error>; |
| type SerializeMap = Map<'w, W>; |
| type SerializeStruct = Struct<'w, W>; |
| type SerializeStructVariant = Impossible<Self::Ok, Self::Error>; |
| |
| fn serialize_bool(self, v: bool) -> Result<Self::Ok> { |
| if v { |
| write!(self.writer, "true")?; |
| } else { |
| write!(self.writer, "false")?; |
| } |
| |
| Ok(()) |
| } |
| |
| fn serialize_i8(self, v: i8) -> Result<Self::Ok> { |
| self.write_primitive(v) |
| } |
| |
| fn serialize_i16(self, v: i16) -> Result<Self::Ok> { |
| self.write_primitive(v) |
| } |
| |
| fn serialize_i32(self, v: i32) -> Result<Self::Ok> { |
| self.write_primitive(v) |
| } |
| |
| fn serialize_i64(self, v: i64) -> Result<Self::Ok> { |
| self.write_primitive(v) |
| } |
| |
| fn serialize_u8(self, v: u8) -> Result<Self::Ok> { |
| self.write_primitive(v) |
| } |
| |
| fn serialize_u16(self, v: u16) -> Result<Self::Ok> { |
| self.write_primitive(v) |
| } |
| |
| fn serialize_u32(self, v: u32) -> Result<Self::Ok> { |
| self.write_primitive(v) |
| } |
| |
| fn serialize_u64(self, v: u64) -> Result<Self::Ok> { |
| self.write_primitive(v) |
| } |
| |
| fn serialize_f32(self, v: f32) -> Result<Self::Ok> { |
| self.write_primitive(v) |
| } |
| |
| fn serialize_f64(self, v: f64) -> Result<Self::Ok> { |
| self.write_primitive(v) |
| } |
| |
| fn serialize_char(self, v: char) -> Result<Self::Ok> { |
| self.write_primitive(v) |
| } |
| |
| fn serialize_str(self, value: &str) -> Result<Self::Ok> { |
| self.write_primitive(value) |
| } |
| |
| fn serialize_bytes(self, value: &[u8]) -> Result<Self::Ok> { |
| // TODO: I imagine you'd want to use base64 here. |
| // Not sure how to roundtrip effectively though... |
| Err(Error::UnsupportedOperation { |
| operation: "serialize_bytes".to_string(), |
| }) |
| } |
| |
| fn serialize_none(self) -> Result<Self::Ok> { |
| Ok(()) |
| } |
| |
| fn serialize_some<T: ?Sized + Serialize>(self, value: &T) -> Result<Self::Ok> { |
| value.serialize(self) |
| } |
| |
| fn serialize_unit(self) -> Result<Self::Ok> { |
| self.serialize_none() |
| } |
| |
| fn serialize_unit_struct(self, name: &'static str) -> Result<Self::Ok> { |
| self.write_wrapped(name, ()) |
| } |
| |
| fn serialize_unit_variant( |
| self, |
| name: &'static str, |
| variant_index: u32, |
| variant: &'static str, |
| ) -> Result<Self::Ok> { |
| Err(Error::UnsupportedOperation { |
| operation: "serialize_unit_variant".to_string(), |
| }) |
| } |
| |
| fn serialize_newtype_struct<T: ?Sized + Serialize>( |
| self, |
| name: &'static str, |
| value: &T, |
| ) -> Result<Self::Ok> { |
| Err(Error::UnsupportedOperation { |
| operation: "serialize_newtype_struct".to_string(), |
| }) |
| } |
| |
| fn serialize_newtype_variant<T: ?Sized + Serialize>( |
| self, |
| name: &'static str, |
| variant_index: u32, |
| variant: &'static str, |
| value: &T, |
| ) -> Result<Self::Ok> { |
| self.write_wrapped(variant, value) |
| } |
| |
| fn serialize_seq(self, len: Option<usize>) -> Result<Self::SerializeSeq> { |
| // TODO: Figure out how to constrain the things written to only be composites |
| Err(Error::UnsupportedOperation { |
| operation: "serialize_seq".to_string(), |
| }) |
| } |
| |
| fn serialize_tuple(self, len: usize) -> Result<Self::SerializeTuple> { |
| Err(Error::UnsupportedOperation { |
| operation: "serialize_tuple".to_string(), |
| }) |
| } |
| |
| fn serialize_tuple_struct( |
| self, |
| name: &'static str, |
| len: usize, |
| ) -> Result<Self::SerializeTupleStruct> { |
| Err(Error::UnsupportedOperation { |
| operation: "serialize_tuple_struct".to_string(), |
| }) |
| } |
| |
| fn serialize_tuple_variant( |
| self, |
| name: &'static str, |
| variant_index: u32, |
| variant: &'static str, |
| len: usize, |
| ) -> Result<Self::SerializeTupleVariant> { |
| Err(Error::UnsupportedOperation { |
| operation: "serialize_tuple_variant".to_string(), |
| }) |
| } |
| |
| fn serialize_map(self, len: Option<usize>) -> Result<Self::SerializeMap> { |
| Ok(Map::new(self)) |
| } |
| |
| fn serialize_struct(self, name: &'static str, len: usize) -> Result<Self::SerializeStruct> { |
| write!(self.writer, "<{}>", name)?; |
| Ok(Struct::new(self, name)) |
| } |
| |
| fn serialize_struct_variant( |
| self, |
| name: &'static str, |
| variant_index: u32, |
| variant: &'static str, |
| len: usize, |
| ) -> Result<Self::SerializeStructVariant> { |
| Err(Error::UnsupportedOperation { |
| operation: "Result".to_string(), |
| }) |
| } |
| } |
| |
| #[cfg(test)] |
| mod tests { |
| use super::*; |
| use serde::ser::{SerializeMap, SerializeStruct}; |
| use serde::Serializer as SerSerializer; |
| use serde_derive::Serialize; |
| |
| #[test] |
| fn test_serialize_bool() { |
| let inputs = vec![(true, "true"), (false, "false")]; |
| |
| for (src, should_be) in inputs { |
| let mut buffer = Vec::new(); |
| |
| { |
| let mut ser = Serializer::new(&mut buffer); |
| ser.serialize_bool(src).unwrap(); |
| } |
| |
| let got = String::from_utf8(buffer).unwrap(); |
| assert_eq!(got, should_be); |
| } |
| } |
| |
| #[test] |
| fn test_start_serialize_struct() { |
| let mut buffer = Vec::new(); |
| |
| { |
| let mut ser = Serializer::new(&mut buffer); |
| let _ = ser.serialize_struct("foo", 0).unwrap(); |
| } |
| |
| let got = String::from_utf8(buffer).unwrap(); |
| assert_eq!(got, "<foo>"); |
| } |
| |
| #[test] |
| fn test_serialize_struct_field() { |
| let mut buffer = Vec::new(); |
| |
| { |
| let mut ser = Serializer::new(&mut buffer); |
| let mut struct_ser = Struct::new(&mut ser, "baz"); |
| struct_ser.serialize_field("foo", "bar").unwrap(); |
| } |
| |
| let got = String::from_utf8(buffer).unwrap(); |
| assert_eq!(got, "<foo>bar</foo>"); |
| } |
| |
| #[test] |
| fn test_serialize_struct() { |
| #[derive(Serialize)] |
| struct Person { |
| name: String, |
| age: u32, |
| } |
| |
| let bob = Person { |
| name: "Bob".to_string(), |
| age: 42, |
| }; |
| let should_be = "<Person><name>Bob</name><age>42</age></Person>"; |
| let mut buffer = Vec::new(); |
| |
| { |
| let mut ser = Serializer::new(&mut buffer); |
| bob.serialize(&mut ser).unwrap(); |
| } |
| |
| let got = String::from_utf8(buffer).unwrap(); |
| assert_eq!(got, should_be); |
| } |
| |
| #[test] |
| fn test_serialize_map_entries() { |
| let should_be = "<name>Bob</name><age>5</age>"; |
| let mut buffer = Vec::new(); |
| |
| { |
| let mut ser = Serializer::new(&mut buffer); |
| let mut map = Map::new(&mut ser); |
| map.serialize_entry("name", "Bob").unwrap(); |
| map.serialize_entry("age", "5").unwrap(); |
| } |
| |
| let got = String::from_utf8(buffer).unwrap(); |
| assert_eq!(got, should_be); |
| } |
| |
| #[test] |
| fn test_serialize_enum() { |
| #[derive(Serialize)] |
| #[allow(dead_code)] |
| enum Node { |
| Boolean(bool), |
| Number(f64), |
| String(String), |
| } |
| |
| let mut buffer = Vec::new(); |
| let should_be = "<Boolean>true</Boolean>"; |
| |
| { |
| let mut ser = Serializer::new(&mut buffer); |
| let node = Node::Boolean(true); |
| node.serialize(&mut ser).unwrap(); |
| } |
| |
| let got = String::from_utf8(buffer).unwrap(); |
| assert_eq!(got, should_be); |
| } |
| |
| #[test] |
| #[ignore] |
| fn serialize_a_list() { |
| let inputs = vec![1, 2, 3, 4]; |
| |
| let mut buffer = Vec::new(); |
| |
| { |
| let mut ser = Serializer::new(&mut buffer); |
| inputs.serialize(&mut ser).unwrap(); |
| } |
| |
| let got = String::from_utf8(buffer).unwrap(); |
| println!("{}", got); |
| panic!(); |
| } |
| } |