b05e148dc9
This allows read_option to be used with a custom option type instead of just core::Option.
587 lines
14 KiB
Rust
587 lines
14 KiB
Rust
// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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//! Support code for encoding and decoding types.
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/*
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Core encoding and decoding interfaces.
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*/
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#[forbid(non_camel_case_types)];
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use core::at_vec;
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use core::prelude::*;
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use core::vec;
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pub trait Encoder {
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// Primitive types:
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fn emit_nil(&self);
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fn emit_uint(&self, v: uint);
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fn emit_u64(&self, v: u64);
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fn emit_u32(&self, v: u32);
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fn emit_u16(&self, v: u16);
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fn emit_u8(&self, v: u8);
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fn emit_int(&self, v: int);
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fn emit_i64(&self, v: i64);
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fn emit_i32(&self, v: i32);
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fn emit_i16(&self, v: i16);
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fn emit_i8(&self, v: i8);
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fn emit_bool(&self, v: bool);
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fn emit_float(&self, v: float);
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fn emit_f64(&self, v: f64);
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fn emit_f32(&self, v: f32);
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fn emit_char(&self, v: char);
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fn emit_borrowed_str(&self, v: &str);
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fn emit_owned_str(&self, v: &str);
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fn emit_managed_str(&self, v: &str);
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// Compound types:
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fn emit_borrowed(&self, f: &fn());
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fn emit_owned(&self, f: &fn());
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fn emit_managed(&self, f: &fn());
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fn emit_enum(&self, name: &str, f: &fn());
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fn emit_enum_variant(&self, v_name: &str, v_id: uint, sz: uint, f: &fn());
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fn emit_enum_variant_arg(&self, idx: uint, f: &fn());
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fn emit_borrowed_vec(&self, len: uint, f: &fn());
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fn emit_owned_vec(&self, len: uint, f: &fn());
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fn emit_managed_vec(&self, len: uint, f: &fn());
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fn emit_vec_elt(&self, idx: uint, f: &fn());
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fn emit_rec(&self, f: &fn());
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fn emit_struct(&self, name: &str, _len: uint, f: &fn());
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fn emit_field(&self, f_name: &str, f_idx: uint, f: &fn());
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fn emit_tup(&self, len: uint, f: &fn());
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fn emit_tup_elt(&self, idx: uint, f: &fn());
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// Specialized types:
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fn emit_option(&self, f: &fn());
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fn emit_option_none(&self);
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fn emit_option_some(&self, f: &fn());
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}
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pub trait Decoder {
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// Primitive types:
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fn read_nil(&self) -> ();
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fn read_uint(&self) -> uint;
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fn read_u64(&self) -> u64;
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fn read_u32(&self) -> u32;
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fn read_u16(&self) -> u16;
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fn read_u8(&self) -> u8;
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fn read_int(&self) -> int;
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fn read_i64(&self) -> i64;
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fn read_i32(&self) -> i32;
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fn read_i16(&self) -> i16;
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fn read_i8(&self) -> i8;
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fn read_bool(&self) -> bool;
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fn read_f64(&self) -> f64;
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fn read_f32(&self) -> f32;
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fn read_float(&self) -> float;
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fn read_char(&self) -> char;
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fn read_owned_str(&self) -> ~str;
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fn read_managed_str(&self) -> @str;
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// Compound types:
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fn read_enum<T>(&self, name: &str, f: &fn() -> T) -> T;
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#[cfg(stage0)]
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fn read_enum_variant<T>(&self, f: &fn(uint) -> T) -> T;
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#[cfg(stage1)]
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#[cfg(stage2)]
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#[cfg(stage3)]
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fn read_enum_variant<T>(&self, names: &[&str], f: &fn(uint) -> T) -> T;
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fn read_enum_variant_arg<T>(&self, idx: uint, f: &fn() -> T) -> T;
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fn read_owned<T>(&self, f: &fn() -> T) -> T;
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fn read_managed<T>(&self, f: &fn() -> T) -> T;
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fn read_owned_vec<T>(&self, f: &fn(uint) -> T) -> T;
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fn read_managed_vec<T>(&self, f: &fn(uint) -> T) -> T;
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fn read_vec_elt<T>(&self, idx: uint, f: &fn() -> T) -> T;
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fn read_rec<T>(&self, f: &fn() -> T) -> T;
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fn read_struct<T>(&self, name: &str, _len: uint, f: &fn() -> T) -> T;
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fn read_field<T>(&self, name: &str, idx: uint, f: &fn() -> T) -> T;
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fn read_tup<T>(&self, sz: uint, f: &fn() -> T) -> T;
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fn read_tup_elt<T>(&self, idx: uint, f: &fn() -> T) -> T;
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// Specialized types:
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fn read_option<T>(&self, f: &fn(bool) -> T) -> T;
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}
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pub trait Encodable<S:Encoder> {
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fn encode(&self, s: &S);
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}
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pub trait Decodable<D:Decoder> {
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fn decode(d: &D) -> Self;
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}
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impl<S:Encoder> Encodable<S> for uint {
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fn encode(&self, s: &S) { s.emit_uint(*self) }
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}
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impl<D:Decoder> Decodable<D> for uint {
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fn decode(d: &D) -> uint {
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d.read_uint()
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}
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}
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impl<S:Encoder> Encodable<S> for u8 {
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fn encode(&self, s: &S) { s.emit_u8(*self) }
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}
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impl<D:Decoder> Decodable<D> for u8 {
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fn decode(d: &D) -> u8 {
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d.read_u8()
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}
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}
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impl<S:Encoder> Encodable<S> for u16 {
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fn encode(&self, s: &S) { s.emit_u16(*self) }
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}
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impl<D:Decoder> Decodable<D> for u16 {
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fn decode(d: &D) -> u16 {
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d.read_u16()
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}
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}
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impl<S:Encoder> Encodable<S> for u32 {
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fn encode(&self, s: &S) { s.emit_u32(*self) }
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}
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impl<D:Decoder> Decodable<D> for u32 {
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fn decode(d: &D) -> u32 {
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d.read_u32()
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}
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}
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impl<S:Encoder> Encodable<S> for u64 {
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fn encode(&self, s: &S) { s.emit_u64(*self) }
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}
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impl<D:Decoder> Decodable<D> for u64 {
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fn decode(d: &D) -> u64 {
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d.read_u64()
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}
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}
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impl<S:Encoder> Encodable<S> for int {
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fn encode(&self, s: &S) { s.emit_int(*self) }
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}
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impl<D:Decoder> Decodable<D> for int {
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fn decode(d: &D) -> int {
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d.read_int()
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}
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}
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impl<S:Encoder> Encodable<S> for i8 {
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fn encode(&self, s: &S) { s.emit_i8(*self) }
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}
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impl<D:Decoder> Decodable<D> for i8 {
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fn decode(d: &D) -> i8 {
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d.read_i8()
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}
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}
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impl<S:Encoder> Encodable<S> for i16 {
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fn encode(&self, s: &S) { s.emit_i16(*self) }
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}
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impl<D:Decoder> Decodable<D> for i16 {
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fn decode(d: &D) -> i16 {
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d.read_i16()
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}
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}
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impl<S:Encoder> Encodable<S> for i32 {
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fn encode(&self, s: &S) { s.emit_i32(*self) }
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}
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impl<D:Decoder> Decodable<D> for i32 {
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fn decode(d: &D) -> i32 {
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d.read_i32()
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}
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}
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impl<S:Encoder> Encodable<S> for i64 {
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fn encode(&self, s: &S) { s.emit_i64(*self) }
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}
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impl<D:Decoder> Decodable<D> for i64 {
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fn decode(d: &D) -> i64 {
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d.read_i64()
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}
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}
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impl<'self, S:Encoder> Encodable<S> for &'self str {
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fn encode(&self, s: &S) { s.emit_borrowed_str(*self) }
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}
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impl<S:Encoder> Encodable<S> for ~str {
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fn encode(&self, s: &S) { s.emit_owned_str(*self) }
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}
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impl<D:Decoder> Decodable<D> for ~str {
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fn decode(d: &D) -> ~str {
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d.read_owned_str()
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}
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}
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impl<S:Encoder> Encodable<S> for @str {
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fn encode(&self, s: &S) { s.emit_managed_str(*self) }
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}
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impl<D:Decoder> Decodable<D> for @str {
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fn decode(d: &D) -> @str {
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d.read_managed_str()
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}
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}
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impl<S:Encoder> Encodable<S> for float {
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fn encode(&self, s: &S) { s.emit_float(*self) }
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}
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impl<D:Decoder> Decodable<D> for float {
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fn decode(d: &D) -> float {
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d.read_float()
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}
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}
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impl<S:Encoder> Encodable<S> for f32 {
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fn encode(&self, s: &S) { s.emit_f32(*self) }
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}
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impl<D:Decoder> Decodable<D> for f32 {
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fn decode(d: &D) -> f32 {
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d.read_f32() }
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}
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impl<S:Encoder> Encodable<S> for f64 {
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fn encode(&self, s: &S) { s.emit_f64(*self) }
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}
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impl<D:Decoder> Decodable<D> for f64 {
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fn decode(d: &D) -> f64 {
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d.read_f64()
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}
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}
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impl<S:Encoder> Encodable<S> for bool {
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fn encode(&self, s: &S) { s.emit_bool(*self) }
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}
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impl<D:Decoder> Decodable<D> for bool {
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fn decode(d: &D) -> bool {
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d.read_bool()
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}
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}
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impl<S:Encoder> Encodable<S> for () {
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fn encode(&self, s: &S) { s.emit_nil() }
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}
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impl<D:Decoder> Decodable<D> for () {
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fn decode(d: &D) -> () {
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d.read_nil()
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}
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}
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impl<'self, S:Encoder,T:Encodable<S>> Encodable<S> for &'self T {
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fn encode(&self, s: &S) {
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s.emit_borrowed(|| (**self).encode(s))
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}
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}
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impl<S:Encoder,T:Encodable<S>> Encodable<S> for ~T {
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fn encode(&self, s: &S) {
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s.emit_owned(|| (**self).encode(s))
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}
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}
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impl<D:Decoder,T:Decodable<D>> Decodable<D> for ~T {
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fn decode(d: &D) -> ~T {
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d.read_owned(|| ~Decodable::decode(d))
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}
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}
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impl<S:Encoder,T:Encodable<S>> Encodable<S> for @T {
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fn encode(&self, s: &S) {
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s.emit_managed(|| (**self).encode(s))
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}
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}
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impl<D:Decoder,T:Decodable<D>> Decodable<D> for @T {
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fn decode(d: &D) -> @T {
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d.read_managed(|| @Decodable::decode(d))
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}
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}
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impl<'self, S:Encoder,T:Encodable<S>> Encodable<S> for &'self [T] {
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fn encode(&self, s: &S) {
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do s.emit_borrowed_vec(self.len()) {
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for self.eachi |i, e| {
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s.emit_vec_elt(i, || e.encode(s))
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}
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}
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}
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}
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impl<S:Encoder,T:Encodable<S>> Encodable<S> for ~[T] {
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fn encode(&self, s: &S) {
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do s.emit_owned_vec(self.len()) {
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for self.eachi |i, e| {
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s.emit_vec_elt(i, || e.encode(s))
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}
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}
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}
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}
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impl<D:Decoder,T:Decodable<D>> Decodable<D> for ~[T] {
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fn decode(d: &D) -> ~[T] {
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do d.read_owned_vec |len| {
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do vec::from_fn(len) |i| {
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d.read_vec_elt(i, || Decodable::decode(d))
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}
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}
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}
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}
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impl<S:Encoder,T:Encodable<S>> Encodable<S> for @[T] {
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fn encode(&self, s: &S) {
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do s.emit_managed_vec(self.len()) {
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for self.eachi |i, e| {
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s.emit_vec_elt(i, || e.encode(s))
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}
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}
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}
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}
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impl<D:Decoder,T:Decodable<D>> Decodable<D> for @[T] {
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fn decode(d: &D) -> @[T] {
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do d.read_managed_vec |len| {
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do at_vec::from_fn(len) |i| {
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d.read_vec_elt(i, || Decodable::decode(d))
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}
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}
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}
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}
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impl<S:Encoder,T:Encodable<S>> Encodable<S> for Option<T> {
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fn encode(&self, s: &S) {
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do s.emit_option {
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match *self {
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None => s.emit_option_none(),
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Some(ref v) => s.emit_option_some(|| v.encode(s)),
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}
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}
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}
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}
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impl<D:Decoder,T:Decodable<D>> Decodable<D> for Option<T> {
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fn decode(d: &D) -> Option<T> {
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do d.read_option |b| {
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if b {
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Some(Decodable::decode(d))
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} else {
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None
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}
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}
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}
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}
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impl<S:Encoder,T0:Encodable<S>,T1:Encodable<S>> Encodable<S> for (T0, T1) {
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fn encode(&self, s: &S) {
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match *self {
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(ref t0, ref t1) => {
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do s.emit_tup(2) {
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s.emit_tup_elt(0, || t0.encode(s));
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s.emit_tup_elt(1, || t1.encode(s));
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}
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}
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}
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}
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}
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impl<D:Decoder,T0:Decodable<D>,T1:Decodable<D>> Decodable<D> for (T0, T1) {
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fn decode(d: &D) -> (T0, T1) {
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do d.read_tup(2) {
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(
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d.read_tup_elt(0, || Decodable::decode(d)),
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d.read_tup_elt(1, || Decodable::decode(d))
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)
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}
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}
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}
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impl<
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S: Encoder,
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T0: Encodable<S>,
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T1: Encodable<S>,
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T2: Encodable<S>
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> Encodable<S> for (T0, T1, T2) {
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fn encode(&self, s: &S) {
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match *self {
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(ref t0, ref t1, ref t2) => {
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do s.emit_tup(3) {
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s.emit_tup_elt(0, || t0.encode(s));
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s.emit_tup_elt(1, || t1.encode(s));
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s.emit_tup_elt(2, || t2.encode(s));
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}
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}
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}
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}
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}
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impl<
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D: Decoder,
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T0: Decodable<D>,
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T1: Decodable<D>,
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T2: Decodable<D>
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> Decodable<D> for (T0, T1, T2) {
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fn decode(d: &D) -> (T0, T1, T2) {
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do d.read_tup(3) {
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(
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d.read_tup_elt(0, || Decodable::decode(d)),
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d.read_tup_elt(1, || Decodable::decode(d)),
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d.read_tup_elt(2, || Decodable::decode(d))
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)
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}
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}
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}
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impl<
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S: Encoder,
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T0: Encodable<S>,
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T1: Encodable<S>,
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T2: Encodable<S>,
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T3: Encodable<S>
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> Encodable<S> for (T0, T1, T2, T3) {
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fn encode(&self, s: &S) {
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match *self {
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(ref t0, ref t1, ref t2, ref t3) => {
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do s.emit_tup(4) {
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s.emit_tup_elt(0, || t0.encode(s));
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s.emit_tup_elt(1, || t1.encode(s));
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s.emit_tup_elt(2, || t2.encode(s));
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s.emit_tup_elt(3, || t3.encode(s));
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}
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}
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}
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}
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}
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impl<
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D: Decoder,
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T0: Decodable<D>,
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T1: Decodable<D>,
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T2: Decodable<D>,
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T3: Decodable<D>
|
|
> Decodable<D> for (T0, T1, T2, T3) {
|
|
fn decode(d: &D) -> (T0, T1, T2, T3) {
|
|
do d.read_tup(4) {
|
|
(
|
|
d.read_tup_elt(0, || Decodable::decode(d)),
|
|
d.read_tup_elt(1, || Decodable::decode(d)),
|
|
d.read_tup_elt(2, || Decodable::decode(d)),
|
|
d.read_tup_elt(3, || Decodable::decode(d))
|
|
)
|
|
}
|
|
}
|
|
}
|
|
|
|
impl<
|
|
S: Encoder,
|
|
T0: Encodable<S>,
|
|
T1: Encodable<S>,
|
|
T2: Encodable<S>,
|
|
T3: Encodable<S>,
|
|
T4: Encodable<S>
|
|
> Encodable<S> for (T0, T1, T2, T3, T4) {
|
|
fn encode(&self, s: &S) {
|
|
match *self {
|
|
(ref t0, ref t1, ref t2, ref t3, ref t4) => {
|
|
do s.emit_tup(5) {
|
|
s.emit_tup_elt(0, || t0.encode(s));
|
|
s.emit_tup_elt(1, || t1.encode(s));
|
|
s.emit_tup_elt(2, || t2.encode(s));
|
|
s.emit_tup_elt(3, || t3.encode(s));
|
|
s.emit_tup_elt(4, || t4.encode(s));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
impl<
|
|
D: Decoder,
|
|
T0: Decodable<D>,
|
|
T1: Decodable<D>,
|
|
T2: Decodable<D>,
|
|
T3: Decodable<D>,
|
|
T4: Decodable<D>
|
|
> Decodable<D> for (T0, T1, T2, T3, T4) {
|
|
fn decode(d: &D)
|
|
-> (T0, T1, T2, T3, T4) {
|
|
do d.read_tup(5) {
|
|
(
|
|
d.read_tup_elt(0, || Decodable::decode(d)),
|
|
d.read_tup_elt(1, || Decodable::decode(d)),
|
|
d.read_tup_elt(2, || Decodable::decode(d)),
|
|
d.read_tup_elt(3, || Decodable::decode(d)),
|
|
d.read_tup_elt(4, || Decodable::decode(d))
|
|
)
|
|
}
|
|
}
|
|
}
|
|
|
|
// ___________________________________________________________________________
|
|
// Helper routines
|
|
//
|
|
// In some cases, these should eventually be coded as traits.
|
|
|
|
pub trait EncoderHelpers {
|
|
fn emit_from_vec<T>(&self, v: &[T], f: &fn(v: &T));
|
|
}
|
|
|
|
impl<S:Encoder> EncoderHelpers for S {
|
|
fn emit_from_vec<T>(&self, v: &[T], f: &fn(v: &T)) {
|
|
do self.emit_owned_vec(v.len()) {
|
|
for v.eachi |i, e| {
|
|
do self.emit_vec_elt(i) {
|
|
f(e)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
pub trait DecoderHelpers {
|
|
fn read_to_vec<T>(&self, f: &fn() -> T) -> ~[T];
|
|
}
|
|
|
|
impl<D:Decoder> DecoderHelpers for D {
|
|
fn read_to_vec<T>(&self, f: &fn() -> T) -> ~[T] {
|
|
do self.read_owned_vec |len| {
|
|
do vec::from_fn(len) |i| {
|
|
self.read_vec_elt(i, || f())
|
|
}
|
|
}
|
|
}
|
|
}
|