smallish 0.1.0

Lightweight, no-std syntax for configuration and scripting.
Documentation 
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use serde::de;

use crate::de::deserialize::{forward_to_inner_deserialize, Access, Error, SmallishDe};
use crate::syntax::Event;

#[derive(Debug)]
#[cfg_attr(feature = "defmt", derive(defmt::Format))]
pub(crate) struct InlineHandler<'a, De> {
    de: &'a mut De,
}

impl<'a, De> InlineHandler<'a, De> {
    pub(crate) fn new(de: &'a mut De) -> Self {
        Self { de }
    }
}

impl<'a, 'de, De> SmallishDe<'de> for &mut InlineHandler<'a, De>
where
    for<'b> &'b mut De: SmallishDe<'de>,
{
    #[inline]
    fn base(self) -> impl SmallishDe<'de> {
        self.de.base()
    }
}

impl<'a, 'de, De> de::Deserializer<'de> for &mut InlineHandler<'a, De>
where
    for<'b> &'b mut De: SmallishDe<'de>,
{
    type Error = Error;

    forward_to_inner_deserialize! {
        bool i8 i16 i32 i64 i128 u8 u16 u32 u64 u128 f32 f64 char str string
        bytes byte_buf option unit unit_struct
        enum identifier ignored_any
    }

    fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Self::Error>
    where
        V: de::Visitor<'de>,
    {
        // Best effort: keys mean maps, EnumClose means empty map,
        // everything else is seq.
        // This breaks empty seq variants. There is no way to get them
        // all to work, and empty seq variants seem more unlikely
        // than unit variants.
        match self.de.peek()? {
            Event::Key(_) | Event::EnumClose => self.deserialize_map(visitor),
            _ => self.deserialize_seq(visitor),
        }
    }

    fn deserialize_newtype_struct<V>(
        self,
        name: &'static str,
        visitor: V,
    ) -> Result<V::Value, Self::Error>
    where
        V: de::Visitor<'de>,
    {
        self.hook_special(name, visitor, |de, visitor| {
            visitor.visit_newtype_struct(de)
        })
    }

    fn deserialize_seq<V>(self, visitor: V) -> Result<V::Value, Self::Error>
    where
        V: de::Visitor<'de>,
    {
        visitor.visit_seq(Access::new(&mut *self.de))
    }

    fn deserialize_tuple<V>(self, _len: usize, visitor: V) -> Result<V::Value, Self::Error>
    where
        V: de::Visitor<'de>,
    {
        self.deserialize_seq(visitor)
    }

    fn deserialize_tuple_struct<V>(
        self,
        _name: &'static str,
        _len: usize,
        visitor: V,
    ) -> Result<V::Value, Self::Error>
    where
        V: de::Visitor<'de>,
    {
        self.deserialize_seq(visitor)
    }

    fn deserialize_map<V>(self, visitor: V) -> Result<V::Value, Self::Error>
    where
        V: de::Visitor<'de>,
    {
        visitor.visit_map(Access::new(&mut *self.de))
    }

    fn deserialize_struct<V>(
        self,
        name: &'static str,
        _fields: &'static [&'static str],
        visitor: V,
    ) -> Result<V::Value, Self::Error>
    where
        V: de::Visitor<'de>,
    {
        self.hook_special(name, visitor, |de, visitor| de.deserialize_map(visitor))
    }
}