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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>(self, visitor: V) -> Result<V::Value>
where V: de::Visitor
{
// 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(s) => visitor.visit_string(s),
ValueKind::Array(values) => unimplemented!(),
ValueKind::Table(map) => visitor.visit_map(MapVisitor::new(map)),
_ => {
unimplemented!();
}
}
}
#[inline]
fn deserialize_bool<V: de::Visitor>(self, visitor: V) -> Result<V::Value> {
visitor.visit_bool(self.into_bool()?)
}
#[inline]
fn deserialize_i8<V: de::Visitor>(self, visitor: V) -> Result<V::Value> {
// FIXME: This should *fail* if the value does not fit in the requets integer type
visitor.visit_i8(self.into_int()? as i8)
}
#[inline]
fn deserialize_i16<V: de::Visitor>(self, visitor: V) -> Result<V::Value> {
// FIXME: This should *fail* if the value does not fit in the requets integer type
visitor.visit_i16(self.into_int()? as i16)
}
#[inline]
fn deserialize_i32<V: de::Visitor>(self, visitor: V) -> Result<V::Value> {
// FIXME: This should *fail* if the value does not fit in the requets integer type
visitor.visit_i32(self.into_int()? as i32)
}
#[inline]
fn deserialize_i64<V: de::Visitor>(self, visitor: V) -> Result<V::Value> {
visitor.visit_i64(self.into_int()?)
}
#[inline]
fn deserialize_u8<V: de::Visitor>(self, visitor: V) -> Result<V::Value> {
// FIXME: This should *fail* if the value does not fit in the requets integer type
visitor.visit_u8(self.into_int()? as u8)
}
#[inline]
fn deserialize_u16<V: de::Visitor>(self, visitor: V) -> Result<V::Value> {
// FIXME: This should *fail* if the value does not fit in the requets integer type
visitor.visit_u16(self.into_int()? as u16)
}
#[inline]
fn deserialize_u32<V: de::Visitor>(self, visitor: V) -> Result<V::Value> {
// FIXME: This should *fail* if the value does not fit in the requets integer type
visitor.visit_u32(self.into_int()? as u32)
}
#[inline]
fn deserialize_u64<V: de::Visitor>(self, visitor: V) -> Result<V::Value> {
// FIXME: This should *fail* if the value does not fit in the requets integer type
visitor.visit_u64(self.into_int()? as u64)
}
#[inline]
fn deserialize_f32<V: de::Visitor>(self, visitor: V) -> Result<V::Value> {
visitor.visit_f32(self.into_float()? as f32)
}
#[inline]
fn deserialize_f64<V: de::Visitor>(self, visitor: V) -> Result<V::Value> {
visitor.visit_f64(self.into_float()?)
}
#[inline]
fn deserialize_str<V: de::Visitor>(self, visitor: V) -> Result<V::Value> {
visitor.visit_string(self.into_str()?)
}
#[inline]
fn deserialize_string<V: de::Visitor>(self, visitor: V) -> Result<V::Value> {
visitor.visit_string(self.into_str()?)
}
#[inline]
fn deserialize_option<V>(self, visitor: V) -> Result<V::Value>
where V: de::Visitor
{
// Match an explicit nil as None and everything else as Some
match self.kind {
ValueKind::Nil => visitor.visit_none(),
_ => visitor.visit_some(self),
}
}
forward_to_deserialize! {
char seq
seq_fixed_size bytes byte_buf map struct unit enum newtype_struct
struct_field ignored_any unit_struct tuple_struct tuple
}
}
struct StrDeserializer<'a>(&'a str);
impl<'a> StrDeserializer<'a> {
fn new(key: &'a str) -> Self {
StrDeserializer(key)
}
}
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 seq
seq_fixed_size bytes byte_buf map struct unit enum newtype_struct
struct_field ignored_any unit_struct tuple_struct tuple option
}
}
struct MapVisitor {
elements: Vec<(String, Value)>,
index: usize,
}
impl MapVisitor {
fn new(mut table: HashMap<String, Value>) -> Self {
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 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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