archlinux-repo-parser 0.1.6

use serde::{ser, Serialize};

use crate::error::{Error, Result};

pub struct Serializer {
    output: String,
}

pub fn to_string<T>(value: &T) -> Result<String>
where
    T: Serialize,
{
    let mut serializer = Serializer {
        output: String::new(),
    };
    value.serialize(&mut serializer)?;
    Ok(serializer.output)
}

impl<'a> ser::Serializer for &'a mut Serializer {
    type Ok = ();
    type Error = Error;

    type SerializeSeq = Self;
    type SerializeTuple = Self;
    type SerializeTupleStruct = Self;
    type SerializeTupleVariant = Self;
    type SerializeMap = Self;
    type SerializeStruct = Self;
    type SerializeStructVariant = Self;

    fn serialize_bool(self, _: bool) -> Result<()> {
        Err(Error::NotSupported)
    }

    fn serialize_i8(self, v: i8) -> Result<()> {
        self.serialize_i64(i64::from(v))
    }

    fn serialize_i16(self, v: i16) -> Result<()> {
        self.serialize_i64(i64::from(v))
    }

    fn serialize_i32(self, v: i32) -> Result<()> {
        self.serialize_i64(i64::from(v))
    }

    fn serialize_i64(self, v: i64) -> Result<()> {
        self.output += &v.to_string();
        Ok(())
    }

    fn serialize_u8(self, v: u8) -> Result<()> {
        self.serialize_u64(u64::from(v))
    }

    fn serialize_u16(self, v: u16) -> Result<()> {
        self.serialize_u64(u64::from(v))
    }

    fn serialize_u32(self, v: u32) -> Result<()> {
        self.serialize_u64(u64::from(v))
    }

    fn serialize_u64(self, v: u64) -> Result<()> {
        self.output += &v.to_string();
        Ok(())
    }

    fn serialize_f32(self, v: f32) -> Result<()> {
        self.serialize_f64(f64::from(v))
    }

    fn serialize_f64(self, _v: f64) -> Result<()> {
        Err(Error::NotSupported)
    }

    fn serialize_char(self, v: char) -> Result<()> {
        self.serialize_str(&v.to_string())
    }

    fn serialize_str(self, v: &str) -> Result<()> {
        self.output += v;
        Ok(())
    }

    fn serialize_bytes(self, _v: &[u8]) -> Result<()> {
        Err(Error::NotSupported)
    }

    fn serialize_none(self) -> Result<()> {
        self.serialize_unit()
    }

    fn serialize_some<T>(self, value: &T) -> Result<()>
    where
        T: ?Sized + Serialize,
    {
        value.serialize(self)
    }

    fn serialize_unit(self) -> Result<()> {
        self.output += "\n";
        Ok(())
    }

    fn serialize_unit_struct(self, _name: &'static str) -> Result<()> {
        self.serialize_unit()
    }

    fn serialize_unit_variant(
        self,
        _name: &'static str,
        _variant_index: u32,
        variant: &'static str,
    ) -> Result<()> {
        self.serialize_str(variant)
    }

    fn serialize_newtype_struct<T>(self, _name: &'static str, value: &T) -> Result<()>
    where
        T: ?Sized + Serialize,
    {
        value.serialize(self)
    }

    fn serialize_newtype_variant<T>(
        self,
        _name: &'static str,
        _variant_index: u32,
        variant: &'static str,
        value: &T,
    ) -> Result<()>
    where
        T: ?Sized + Serialize,
    {
        self.output += "%";
        variant.serialize(&mut *self)?;
        self.output += "%";
        value.serialize(&mut *self)?;
        self.output += "\n";
        Ok(())
    }

    fn serialize_seq(self, _len: Option<usize>) -> Result<Self::SerializeSeq> {
        Ok(self)
    }

    fn serialize_tuple(self, len: usize) -> Result<Self::SerializeTuple> {
        self.serialize_seq(Some(len))
    }

    fn serialize_tuple_struct(
        self,
        _name: &'static str,
        len: usize,
    ) -> Result<Self::SerializeTupleStruct> {
        self.serialize_seq(Some(len))
    }

    fn serialize_tuple_variant(
        self,
        _name: &'static str,
        _variant_index: u32,
        _variant: &'static str,
        _len: usize,
    ) -> Result<Self::SerializeTupleVariant> {
        Err(Error::NotSupported)
    }

    fn serialize_map(self, _len: Option<usize>) -> Result<Self::SerializeMap> {
        Ok(self)
    }

    fn serialize_struct(self, _name: &'static str, len: usize) -> Result<Self::SerializeStruct> {
        self.serialize_map(Some(len))
    }

    fn serialize_struct_variant(
        self,
        _name: &'static str,
        _variant_index: u32,
        _variant: &'static str,
        _len: usize,
    ) -> Result<Self::SerializeStructVariant> {
        Err(Error::NotSupported)
    }
}

impl<'a> ser::SerializeSeq for &'a mut Serializer {
    type Ok = ();
    type Error = Error;

    fn serialize_element<T>(&mut self, value: &T) -> Result<()>
    where
        T: ?Sized + Serialize,
    {
        value.serialize(&mut **self)?;
        self.output += "\n";
        Ok(())
    }

    fn end(self) -> Result<()> {
        self.output = self.output[..self.output.len() - 1].to_owned(); // Cut last \n
        Ok(())
    }
}

impl<'a> ser::SerializeTuple for &'a mut Serializer {
    type Ok = ();
    type Error = Error;

    fn serialize_element<T>(&mut self, value: &T) -> Result<()>
    where
        T: ?Sized + Serialize,
    {
        value.serialize(&mut **self)?;
        self.output += "\n";
        Ok(())
    }

    fn end(self) -> Result<()> {
        self.output = self.output[..self.output.len() - 1].to_owned(); // Cut last \n
        Ok(())
    }
}

impl<'a> ser::SerializeTupleStruct for &'a mut Serializer {
    type Ok = ();
    type Error = Error;

    fn serialize_field<T>(&mut self, value: &T) -> Result<()>
    where
        T: ?Sized + Serialize,
    {
        value.serialize(&mut **self)?;
        self.output += "\n";
        Ok(())
    }

    fn end(self) -> Result<()> {
        self.output = self.output[..self.output.len() - 1].to_owned(); // Cut last \n
        Ok(())
    }
}

impl<'a> ser::SerializeTupleVariant for &'a mut Serializer {
    type Ok = ();
    type Error = Error;

    fn serialize_field<T>(&mut self, _: &T) -> Result<()>
    where
        T: ?Sized + Serialize,
    {
        Err(Error::NotSupported)
    }

    fn end(self) -> Result<()> {
        Err(Error::NotSupported)
    }
}

impl<'a> ser::SerializeMap for &'a mut Serializer {
    type Ok = ();
    type Error = Error;

    fn serialize_key<T>(&mut self, key: &T) -> Result<()>
    where
        T: ?Sized + Serialize,
    {
        self.output += "%";
        key.serialize(&mut **self)?;
        self.output += "%";
        Ok(())
    }

    fn serialize_value<T>(&mut self, value: &T) -> Result<()>
    where
        T: ?Sized + Serialize,
    {
        self.output += "\n";
        value.serialize(&mut **self)?;
        self.output += "\n";
        self.output += "\n";
        Ok(())
    }

    fn end(self) -> Result<()> {
        Ok(())
    }
}

impl<'a> ser::SerializeStruct for &'a mut Serializer {
    type Ok = ();
    type Error = Error;

    fn serialize_field<T>(&mut self, key: &'static str, value: &T) -> Result<()>
    where
        T: ?Sized + Serialize,
    {
        self.output += "%";
        key.serialize(&mut **self)?;
        self.output += "%";
        self.output += "\n";
        value.serialize(&mut **self)?;
        self.output += "\n";
        self.output += "\n";
        Ok(())
    }

    fn end(self) -> Result<()> {
        Ok(())
    }
}

// Similar to `SerializeTupleVariant`, here the `end` method is responsible for
// closing both of the curly braces opened by `serialize_struct_variant`.
impl<'a> ser::SerializeStructVariant for &'a mut Serializer {
    type Ok = ();
    type Error = Error;

    fn serialize_field<T>(&mut self, _key: &'static str, _value: &T) -> Result<()>
    where
        T: ?Sized + Serialize,
    {
        Err(Error::NotSupported)
    }

    fn end(self) -> Result<()> {
        Err(Error::NotSupported)
    }
}

#[cfg(test)]
mod test {
    use serde::Serialize;

    #[test]
    fn test_struct() {
        #[derive(Serialize, PartialEq, Debug)]
        struct Test {
            #[serde(rename = "NAME")]
            name: String,
            #[serde(rename = "BUILDDATE")]
            build_date: u32,
            #[serde(rename = "DEPENDS")]
            depends: Vec<String>,
        }

        let j = r#"%NAME%
mingw-w64-x86_64-vcdimager

%BUILDDATE%
1592300880

%DEPENDS%
mingw-w64-x86_64-libcdio
mingw-w64-x86_64-libxml2
mingw-w64-x86_64-popt

"#;
        let val = Test {
            build_date: 1592300880,
            depends: vec![
                "mingw-w64-x86_64-libcdio".to_owned(),
                "mingw-w64-x86_64-libxml2".to_owned(),
                "mingw-w64-x86_64-popt".to_owned(),
            ],
            name: "mingw-w64-x86_64-vcdimager".to_owned(),
        };
        assert_eq!(crate::to_string(&val).unwrap(), j);
    }
}