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61 lines
1.7 KiB
61 lines
1.7 KiB
//! The available formats to convert
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use super::*;
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use std::io;
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use object::Object;
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/// `Format` impl for JSON.
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mod json;
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/// `Format` impl for S expressions.
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mod sexpr;
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/// `Format` impl for CBOR.
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mod cbor;
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pub mod error;
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use error::*;
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pub mod config;
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use config::*;
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/// A directive for a format on how to encode and decode objects.
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#[derive(Clone, Copy)]
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pub struct FormatDirective
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{
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encode: fn (&Config, &mut dyn io::Write, &Object) -> Result<usize, Error>,
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decode: fn (&Config, &mut dyn io::Read) -> Result<(Object, usize), Error>,
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}
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/// Trait for statically implementing formatters to/from `Object`.
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pub trait Format
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{
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fn encode<W: io::Write>(cfg: &Config, to: W, obj: &Object) -> Result<usize, ErrorKind>;
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fn decode<R: io::Read>(cfg: &Config, from: R) -> Result<Object, ErrorKind>;
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}
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macro_rules! directive {
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($($name:literal),+ => $encode:expr, $decode:expr) => {
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(&[$($name),+], FormatDirective {
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encode: $encode,
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decode: $decode,
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})
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};
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(for $fmt:path => $($name:literal),+) => {
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directive!($($name),+ => |c, w, o| {
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<$fmt as Format>::encode(c, w, o).map_err(Error::encode)
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}, |c, r| {
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let mut r = r.with_counter();
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let obj = <$fmt as Format>::decode(c, &mut r).map_err(Error::decode)?;
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Ok((obj, r.count()))
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})
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}
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}
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/// All format directives and their name(s)
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pub static FORMATS: &[(&'static [&'static str], FormatDirective)] = &[
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directive!(for json::JsonFormatter => "json", "js", "javascript"),
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directive!(for sexpr::SExpressionFormatter => "s-expression", "sexpr", "lisp", "lexpr"),
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directive!(for cbor::CborFormatter => "cbor"),
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];
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//const _: &[u8; 0] = &[0u8; std::mem::size_of::<Error>()]; // Size of error type check (unboxed 56 -> boxed 16)
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