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use serde::de;
use Value;
use super::{Decoder, DecodeError, DecodeErrorKind};
struct DecodeValue(Value);
struct MapVisitor<I>(I, Option<Value>);
struct SubDecoder(Decoder);
fn se2toml(err: de::value::Error, ty: &'static str) -> DecodeError {
match err {
de::value::Error::SyntaxError => de::Error::syntax_error(),
de::value::Error::EndOfStreamError => de::Error::end_of_stream_error(),
de::value::Error::MissingFieldError(s) => {
DecodeError {
field: Some(s.to_string()),
kind: DecodeErrorKind::ExpectedField(Some(ty)),
}
},
de::value::Error::UnknownFieldError(s) => {
DecodeError {
field: Some(s.to_string()),
kind: DecodeErrorKind::UnknownField,
}
},
}
}
impl de::Deserializer for Decoder {
type Error = DecodeError;
fn visit<V>(&mut self, mut visitor: V) -> Result<V::Value, DecodeError>
where V: de::Visitor
{
match self.toml.take() {
Some(Value::String(s)) => {
visitor.visit_string(s).map_err(|e| se2toml(e, "string"))
}
Some(Value::Integer(i)) => {
visitor.visit_i64(i).map_err(|e| se2toml(e, "integer"))
}
Some(Value::Float(f)) => {
visitor.visit_f64(f).map_err(|e| se2toml(e, "float"))
}
Some(Value::Boolean(b)) => {
visitor.visit_bool(b).map_err(|e| se2toml(e, "bool"))
}
Some(Value::Datetime(s)) => {
visitor.visit_string(s).map_err(|e| se2toml(e, "date"))
}
Some(Value::Array(a)) => {
let len = a.len();
let iter = a.into_iter().map(DecodeValue);
let e = visitor.visit_seq(de::value::SeqDeserializer::new(iter,
len));
e.map_err(|e| se2toml(e, "array"))
}
Some(Value::Table(t)) => {
visitor.visit_map(MapVisitor(t.into_iter(), None))
}
None => Err(de::Error::end_of_stream_error()),
}
}
fn visit_option<V>(&mut self, mut visitor: V) -> Result<V::Value, DecodeError>
where V: de::Visitor
{
if self.toml.is_none() {
visitor.visit_none()
} else {
visitor.visit_some(self)
}
}
fn visit_seq<V>(&mut self, mut visitor: V) -> Result<V::Value, DecodeError>
where V: de::Visitor,
{
if self.toml.is_none() {
let iter = None::<i32>.into_iter();
let e = visitor.visit_seq(de::value::SeqDeserializer::new(iter, 0));
e.map_err(|e| se2toml(e, "array"))
} else {
self.visit(visitor)
}
}
}
impl de::Error for DecodeError {
fn syntax_error() -> DecodeError {
DecodeError { field: None, kind: DecodeErrorKind::SyntaxError }
}
fn end_of_stream_error() -> DecodeError {
DecodeError { field: None, kind: DecodeErrorKind::EndOfStream }
}
fn missing_field_error(name: &'static str) -> DecodeError {
DecodeError {
field: Some(name.to_string()),
kind: DecodeErrorKind::ExpectedField(None),
}
}
fn unknown_field_error(name: &str) -> DecodeError {
DecodeError {
field: Some(name.to_string()),
kind: DecodeErrorKind::UnknownField,
}
}
}
impl de::Deserializer for SubDecoder {
type Error = de::value::Error;
fn visit<V>(&mut self, visitor: V) -> Result<V::Value, de::value::Error>
where V: de::Visitor
{
self.0.visit(visitor).map_err(|e| {
match e.kind {
DecodeErrorKind::SyntaxError => de::value::Error::SyntaxError,
DecodeErrorKind::EndOfStream => de::value::Error::EndOfStreamError,
_ => de::value::Error::SyntaxError,
}
})
}
}
impl de::value::ValueDeserializer for DecodeValue {
type Deserializer = SubDecoder;
fn into_deserializer(self) -> SubDecoder {
SubDecoder(Decoder::new(self.0))
}
}
impl<I> de::MapVisitor for MapVisitor<I>
where I: Iterator<Item=(String, Value)>
{
type Error = DecodeError;
fn visit_key<K>(&mut self) -> Result<Option<K>, DecodeError>
where K: de::Deserialize
{
match self.0.next() {
Some((k, v)) => {
self.1 = Some(v);
de::Deserialize::deserialize(&mut Decoder::new(Value::String(k)))
.map(|v| Some(v))
}
None => Ok(None),
}
}
fn visit_value<V>(&mut self) -> Result<V, DecodeError>
where V: de::Deserialize
{
match self.1.take() {
Some(t) => de::Deserialize::deserialize(&mut Decoder::new(t)),
None => Err(de::Error::end_of_stream_error())
}
}
fn end(&mut self) -> Result<(), DecodeError> {
Ok(())
}
}
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