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use serde::de;
use value::{Value, ValueKind};
use error::*;
use std::borrow::Cow;
use std::iter::Peekable;
use std::collections::HashMap;
use std::collections::hash_map::Drain;
impl de::Deserializer for Value {
type Error = ConfigError;
#[inline]
fn deserialize<V: de::Visitor>(self, visitor: V) -> Result<V::Value> {
// Deserialize based on the underlying type
match self.kind {
ValueKind::Integer(i) => visitor.visit_i64(i),
ValueKind::Boolean(b) => visitor.visit_bool(b),
ValueKind::Float(f) => visitor.visit_f64(f),
// ValueKind::String(Cow::Borrowed(s)) => visitor.visit_str(s),
// ValueKind::String(Cow::Owned(s)) => visitor.visit_string(s),
ValueKind::Table(map) => visitor.visit_map(MapVisitor::new(map)),
_ => { unimplemented!(); }
}
}
forward_to_deserialize! {
bool u8 u16 u32 u64 i8 i16 i32 i64 f32 f64 char str string seq
seq_fixed_size bytes byte_buf map struct unit enum newtype_struct
struct_field ignored_any unit_struct tuple_struct tuple option
}
}
struct StrDeserializer<'a>(&'a str);
impl<'a> de::Deserializer for StrDeserializer<'a> {
type Error = ConfigError;
#[inline]
fn deserialize<V: de::Visitor>(self, visitor: V) -> Result<V::Value> {
visitor.visit_str(self.0)
}
forward_to_deserialize! {
bool
u8
u16
u32
u64
i8
i16
i32
i64
f32
f64
char
str
string
bytes
byte_buf
option
unit
unit_struct
newtype_struct
seq
seq_fixed_size
tuple
tuple_struct
map
struct
struct_field
enum
ignored_any
}
}
struct MapVisitor {
elements: Vec<(String, Value)>,
index: usize,
}
impl MapVisitor {
fn new(mut table: HashMap<String, Value>) -> MapVisitor {
MapVisitor { elements: table.drain().collect(), index: 0 }
}
}
impl de::MapVisitor for MapVisitor {
type Error = ConfigError;
fn visit_key_seed<K>(&mut self, seed: K) -> Result<Option<K::Value>>
where K: de::DeserializeSeed,
{
if self.index >= self.elements.len() {
return Ok(None);
}
let ref key_s = self.elements[0].0;
let key_de = StrDeserializer(&key_s);
let key = de::DeserializeSeed::deserialize(seed, key_de)?;
Ok(Some(key))
}
fn visit_value_seed<V>(&mut self, seed: V) -> Result<V::Value>
where V: de::DeserializeSeed,
{
de::DeserializeSeed::deserialize(seed, self.elements.remove(0).1)
}
}
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