1 files changed, 320 insertions, 0 deletions
diff --git a/src/de.rs b/src/de.rs
new file mode 100644
index 0000000..6487f8b
--- /dev/null
+++ b/src/de.rs
@@ -0,0 +1,320 @@
+use serde::de;
+use value::{Value, ValueWithKey, ValueKind};
+use error::*;
+use std::borrow::Cow;
+use std::iter::Peekable;
+use std::collections::HashMap;
+use std::collections::hash_map::Drain;
+
+// TODO: Use a macro or some other magic to reduce the code duplication here
+
+impl<'de> de::Deserializer<'de> for ValueWithKey<'de> {
+    type Error = ConfigError;
+
+    #[inline]
+    fn deserialize_any<V>(self, visitor: V) -> Result<V::Value>
+        where V: de::Visitor<'de>
+    {
+        // Deserialize based on the underlying type
+        match self.0.kind {
+            ValueKind::Nil => visitor.visit_unit(),
+            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) => visitor.visit_seq(SeqAccess::new(values)),
+            ValueKind::Table(map) => visitor.visit_map(MapAccess::new(map)),
+        }
+    }
+
+    #[inline]
+    fn deserialize_bool<V: de::Visitor<'de>>(self, visitor: V) -> Result<V::Value> {
+        visitor.visit_bool(self.into_bool()?)
+    }
+
+    #[inline]
+    fn deserialize_i8<V: de::Visitor<'de>>(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<'de>>(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<'de>>(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<'de>>(self, visitor: V) -> Result<V::Value> {
+        visitor.visit_i64(self.into_int()?)
+    }
+
+    #[inline]
+    fn deserialize_u8<V: de::Visitor<'de>>(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<'de>>(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<'de>>(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<'de>>(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<'de>>(self, visitor: V) -> Result<V::Value> {
+        visitor.visit_f32(self.into_float()? as f32)
+    }
+
+    #[inline]
+    fn deserialize_f64<V: de::Visitor<'de>>(self, visitor: V) -> Result<V::Value> {
+        visitor.visit_f64(self.into_float()?)
+    }
+
+    #[inline]
+    fn deserialize_str<V: de::Visitor<'de>>(self, visitor: V) -> Result<V::Value> {
+        visitor.visit_string(self.into_str()?)
+    }
+
+    #[inline]
+    fn deserialize_string<V: de::Visitor<'de>>(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<'de>
+    {
+        // Match an explicit nil as None and everything else as Some
+        match self.0.kind {
+            ValueKind::Nil => visitor.visit_none(),
+            _ => visitor.visit_some(self),
+        }
+    }
+
+    forward_to_deserialize_any! {
+        char seq
+        bytes byte_buf map struct unit enum newtype_struct
+        identifier ignored_any unit_struct tuple_struct tuple
+    }
+}
+
+impl<'de> de::Deserializer<'de> for Value {
+    type Error = ConfigError;
+
+    #[inline]
+    fn deserialize_any<V>(self, visitor: V) -> Result<V::Value>
+        where V: de::Visitor<'de>
+    {
+        // Deserialize based on the underlying type
+        match self.kind {
+            ValueKind::Nil => visitor.visit_unit(),
+            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) => visitor.visit_seq(SeqAccess::new(values)),
+            ValueKind::Table(map) => visitor.visit_map(MapAccess::new(map)),
+        }
+    }
+
+    #[inline]
+    fn deserialize_bool<V: de::Visitor<'de>>(self, visitor: V) -> Result<V::Value> {
+        visitor.visit_bool(self.into_bool()?)
+    }
+
+    #[inline]
+    fn deserialize_i8<V: de::Visitor<'de>>(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<'de>>(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<'de>>(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<'de>>(self, visitor: V) -> Result<V::Value> {
+        visitor.visit_i64(self.into_int()?)
+    }
+
+    #[inline]
+    fn deserialize_u8<V: de::Visitor<'de>>(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<'de>>(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<'de>>(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<'de>>(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<'de>>(self, visitor: V) -> Result<V::Value> {
+        visitor.visit_f32(self.into_float()? as f32)
+    }
+
+    #[inline]
+    fn deserialize_f64<V: de::Visitor<'de>>(self, visitor: V) -> Result<V::Value> {
+        visitor.visit_f64(self.into_float()?)
+    }
+
+    #[inline]
+    fn deserialize_str<V: de::Visitor<'de>>(self, visitor: V) -> Result<V::Value> {
+        visitor.visit_string(self.into_str()?)
+    }
+
+    #[inline]
+    fn deserialize_string<V: de::Visitor<'de>>(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<'de>
+    {
+        // 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_any! {
+        char seq
+        bytes byte_buf map struct unit enum newtype_struct
+        identifier 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<'de, 'a> de::Deserializer<'de> for StrDeserializer<'a> {
+    type Error = ConfigError;
+
+    #[inline]
+    fn deserialize_any<V: de::Visitor<'de>>(self, visitor: V) -> Result<V::Value> {
+        visitor.visit_str(self.0)
+    }
+
+    forward_to_deserialize_any! {
+        bool u8 u16 u32 u64 i8 i16 i32 i64 f32 f64 char str string seq
+        bytes byte_buf map struct unit enum newtype_struct
+        identifier ignored_any unit_struct tuple_struct tuple option
+    }
+}
+
+struct SeqAccess {
+    elements: ::std::vec::IntoIter<Value>,
+}
+
+impl SeqAccess {
+    fn new(elements: Vec<Value>) -> Self {
+        SeqAccess {
+            elements: elements.into_iter(),
+        }
+    }
+}
+
+impl<'de> de::SeqAccess<'de> for SeqAccess {
+    type Error = ConfigError;
+
+    fn next_element_seed<T>(&mut self, seed: T) -> Result<Option<T::Value>>
+        where T: de::DeserializeSeed<'de>
+    {
+        match self.elements.next() {
+            Some(value) => seed.deserialize(value).map(Some),
+            None => Ok(None),
+        }
+    }
+
+    fn size_hint(&self) -> Option<usize> {
+        match self.elements.size_hint() {
+            (lower, Some(upper)) if lower == upper => Some(upper),
+            _ => None,
+        }
+    }
+}
+
+struct MapAccess {
+    elements: Vec<(String, Value)>,
+    index: usize,
+}
+
+impl MapAccess {
+    fn new(mut table: HashMap<String, Value>) -> Self {
+        MapAccess {
+            elements: table.drain().collect(),
+            index: 0,
+        }
+    }
+}
+
+impl<'de> de::MapAccess<'de> for MapAccess {
+    type Error = ConfigError;
+
+    fn next_key_seed<K>(&mut self, seed: K) -> Result<Option<K::Value>>
+        where K: de::DeserializeSeed<'de>
+    {
+        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 next_value_seed<V>(&mut self, seed: V) -> Result<V::Value>
+        where V: de::DeserializeSeed<'de>
+    {
+        de::DeserializeSeed::deserialize(seed, self.elements.remove(0).1)
+    }
+}