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use rustc_serialize as serialize;
use {ByteString, Result, Error};
pub struct Encoded {
record: Vec<ByteString>,
}
impl Encoded {
pub fn new() -> Encoded { Encoded { record: vec![] } }
pub fn unwrap(self) -> Vec<ByteString> { self.record }
fn push_bytes<'a, S>(&mut self, s: S) -> Result<()>
where S: Into<Vec<u8>> {
self.record.push(s.into());
Ok(())
}
fn push_string<'a, S>(&mut self, s: S) -> Result<()>
where S: Into<String> {
self.push_bytes(s.into().into_bytes())
}
fn push_to_string<T: ToString>(&mut self, t: T) -> Result<()> {
self.push_string(t.to_string())
}
}
impl serialize::Encoder for Encoded {
type Error = Error;
fn emit_nil(&mut self) -> Result<()> { unimplemented!() }
fn emit_usize(&mut self, v: usize) -> Result<()> {
self.push_to_string(v)
}
fn emit_u64(&mut self, v: u64) -> Result<()> { self.push_to_string(v) }
fn emit_u32(&mut self, v: u32) -> Result<()> { self.push_to_string(v) }
fn emit_u16(&mut self, v: u16) -> Result<()> { self.push_to_string(v) }
fn emit_u8(&mut self, v: u8) -> Result<()> { self.push_to_string(v) }
fn emit_isize(&mut self, v: isize) -> Result<()> {
self.push_to_string(v)
}
fn emit_i64(&mut self, v: i64) -> Result<()> { self.push_to_string(v) }
fn emit_i32(&mut self, v: i32) -> Result<()> { self.push_to_string(v) }
fn emit_i16(&mut self, v: i16) -> Result<()> { self.push_to_string(v) }
fn emit_i8(&mut self, v: i8) -> Result<()> { self.push_to_string(v) }
fn emit_bool(&mut self, v: bool) -> Result<()> {
self.push_to_string(v)
}
fn emit_f64(&mut self, v: f64) -> Result<()> {
self.push_string(float_to_string(v))
}
fn emit_f32(&mut self, v: f32) -> Result<()> {
self.push_string(float_to_string(v as f64))
}
fn emit_char(&mut self, v: char) -> Result<()> {
self.push_string(format!("{}", v))
}
fn emit_str(&mut self, v: &str) -> Result<()> {
self.push_string(v)
}
fn emit_enum<F>(&mut self, _: &str, f: F) -> Result<()>
where F: FnOnce(&mut Encoded) -> Result<()> {
f(self)
}
fn emit_enum_variant<F>(&mut self, v_name: &str, _: usize,
len: usize, f: F) -> Result<()>
where F: FnOnce(&mut Encoded) -> Result<()> {
match len {
0 => self.push_string(v_name),
1 => f(self),
_ => Err(
Error::Encode("Cannot encode enum variants \
with more than one argument.".to_string())),
}
}
fn emit_enum_variant_arg<F>(&mut self, _: usize, f: F) -> Result<()>
where F: FnOnce(&mut Encoded) -> Result<()> {
f(self)
}
fn emit_enum_struct_variant<F>(&mut self, v_name: &str, v_id: usize,
len: usize, f: F)
-> Result<()>
where F: FnOnce(&mut Encoded) -> Result<()> {
self.emit_enum_variant(v_name, v_id, len, f)
}
fn emit_enum_struct_variant_field<F>(&mut self, _: &str, _: usize, _: F)
-> Result<()>
where F: FnOnce(&mut Encoded) -> Result<()> {
Err(Error::Encode("Cannot encode enum \
variants with arguments.".to_string()))
}
fn emit_struct<F>(&mut self, _: &str, len: usize, f: F) -> Result<()>
where F: FnOnce(&mut Encoded) -> Result<()> {
self.emit_seq(len, f)
}
fn emit_struct_field<F>(&mut self, _: &str, f_idx: usize, f: F)
-> Result<()>
where F: FnOnce(&mut Encoded) -> Result<()> {
self.emit_seq_elt(f_idx, f)
}
fn emit_tuple<F>(&mut self, len: usize, f: F) -> Result<()>
where F: FnOnce(&mut Encoded) -> Result<()> {
self.emit_seq(len, f)
}
fn emit_tuple_arg<F>(&mut self, idx: usize, f: F) -> Result<()>
where F: FnOnce(&mut Encoded) -> Result<()> {
self.emit_seq_elt(idx, f)
}
fn emit_tuple_struct<F>(&mut self, _: &str, _: usize, _: F)
-> Result<()>
where F: FnOnce(&mut Encoded) -> Result<()> {
unimplemented!()
}
fn emit_tuple_struct_arg<F>(&mut self, _: usize, _: F) -> Result<()>
where F: FnOnce(&mut Encoded) -> Result<()> {
unimplemented!()
}
fn emit_option<F>(&mut self, f: F) -> Result<()>
where F: FnOnce(&mut Encoded) -> Result<()> {
f(self)
}
fn emit_option_none(&mut self) -> Result<()> {
self.push_bytes::<&[u8]>(&[])
}
fn emit_option_some<F>(&mut self, f: F) -> Result<()>
where F: FnOnce(&mut Encoded) -> Result<()> {
f(self)
}
fn emit_seq<F>(&mut self, _: usize, f: F) -> Result<()>
where F: FnOnce(&mut Encoded) -> Result<()> {
f(self)
}
fn emit_seq_elt<F>(&mut self, _: usize, f: F) -> Result<()>
where F: FnOnce(&mut Encoded) -> Result<()> {
f(self)
}
fn emit_map<F>(&mut self, _: usize, _: F) -> Result<()>
where F: FnOnce(&mut Encoded) -> Result<()> {
unimplemented!()
}
fn emit_map_elt_key<F>(&mut self, _: usize, _: F) -> Result<()>
where F: FnOnce(&mut Encoded) -> Result<()> {
unimplemented!()
}
fn emit_map_elt_val<F>(&mut self, _: usize, _: F) -> Result<()>
where F: FnOnce(&mut Encoded) -> Result<()> {
unimplemented!()
}
}
fn float_to_string(v: f64) -> String {
let s: String = format!("{:.10}", v).trim_right_matches('0').into();
if s.ends_with('.') { s + "0" } else { s }
}