1191 lines
32 KiB
Rust
1191 lines
32 KiB
Rust
// Copyright 2012-2014 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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use std::collections::{HashMap, TreeMap};
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use std::gc::{GC, Gc};
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use std::hash::Hash;
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use std::num;
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use std::rc::Rc;
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use std::sync::Arc;
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#[deriving(Clone, PartialEq, Show)]
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pub enum Token {
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Null,
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Bool(bool),
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Int(int),
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I8(i8),
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I16(i16),
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I32(i32),
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I64(i64),
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Uint(uint),
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U8(u8),
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U16(u16),
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U32(u32),
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U64(u64),
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F32(f32),
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F64(f64),
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Char(char),
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Str(&'static str),
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String(String),
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Option(bool),
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TupleStart(uint),
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StructStart(&'static str, uint),
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EnumStart(&'static str, &'static str, uint),
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SeqStart(uint),
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MapStart(uint),
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End,
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}
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macro_rules! to_result {
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($expr:expr, $err:expr) => {
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match $expr {
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Some(value) => Ok(value),
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None => $err,
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}
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}
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}
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pub trait Deserializer<E>: Iterator<Result<Token, E>> {
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fn end_of_stream_error<T>(&self) -> Result<T, E>;
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fn syntax_error<T>(&self, token: Token) -> Result<T, E>;
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fn missing_field_error<T>(&self, field: &'static str) -> Result<T, E>;
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#[inline]
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fn expect_token(&mut self) -> Result<Token, E> {
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match self.next() {
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Some(Ok(token)) => Ok(token),
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Some(Err(err)) => Err(err),
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None => self.end_of_stream_error(),
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}
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}
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#[inline]
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fn expect_null(&mut self, token: Token) -> Result<(), E> {
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match token {
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Null => Ok(()),
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TupleStart(_) => {
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match try!(self.expect_token()) {
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End => Ok(()),
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token => self.syntax_error(token),
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}
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}
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token => self.syntax_error(token),
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}
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}
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#[inline]
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fn expect_bool(&mut self, token: Token) -> Result<bool, E> {
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match token {
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Bool(value) => Ok(value),
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token => self.syntax_error(token),
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}
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}
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#[inline]
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fn expect_num<T: NumCast>(&mut self, token: Token) -> Result<T, E> {
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match token {
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Int(x) => to_result!(num::cast(x), self.syntax_error(Int(x))),
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I8(x) => to_result!(num::cast(x), self.syntax_error(I8(x))),
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I16(x) => to_result!(num::cast(x), self.syntax_error(I16(x))),
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I32(x) => to_result!(num::cast(x), self.syntax_error(I32(x))),
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I64(x) => to_result!(num::cast(x), self.syntax_error(I64(x))),
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Uint(x) => to_result!(num::cast(x), self.syntax_error(Uint(x))),
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U8(x) => to_result!(num::cast(x), self.syntax_error(U8(x))),
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U16(x) => to_result!(num::cast(x), self.syntax_error(U16(x))),
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U32(x) => to_result!(num::cast(x), self.syntax_error(U32(x))),
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U64(x) => to_result!(num::cast(x), self.syntax_error(U64(x))),
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F32(x) => to_result!(num::cast(x), self.syntax_error(F32(x))),
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F64(x) => to_result!(num::cast(x), self.syntax_error(F64(x))),
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token => self.syntax_error(token),
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}
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}
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#[inline]
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fn expect_from_primitive<T: FromPrimitive>(&mut self, token: Token) -> Result<T, E> {
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match token {
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Int(x) => to_result!(num::from_int(x), self.syntax_error(Int(x))),
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I8(x) => to_result!(num::from_i8(x), self.syntax_error(I8(x))),
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I16(x) => to_result!(num::from_i16(x), self.syntax_error(I16(x))),
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I32(x) => to_result!(num::from_i32(x), self.syntax_error(I32(x))),
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I64(x) => to_result!(num::from_i64(x), self.syntax_error(I64(x))),
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Uint(x) => to_result!(num::from_uint(x), self.syntax_error(Uint(x))),
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U8(x) => to_result!(num::from_u8(x), self.syntax_error(U8(x))),
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U16(x) => to_result!(num::from_u16(x), self.syntax_error(U16(x))),
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U32(x) => to_result!(num::from_u32(x), self.syntax_error(U32(x))),
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U64(x) => to_result!(num::from_u64(x), self.syntax_error(U64(x))),
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F32(x) => to_result!(num::from_f32(x), self.syntax_error(F32(x))),
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F64(x) => to_result!(num::from_f64(x), self.syntax_error(F64(x))),
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token => self.syntax_error(token),
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}
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}
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#[inline]
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fn expect_char(&mut self, token: Token) -> Result<char, E> {
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match token {
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Char(value) => Ok(value),
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token => self.syntax_error(token),
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}
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}
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#[inline]
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fn expect_str(&mut self, token: Token) -> Result<&'static str, E> {
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match token {
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Str(value) => Ok(value),
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token => self.syntax_error(token),
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}
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}
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#[inline]
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fn expect_string(&mut self, token: Token) -> Result<String, E> {
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match token {
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Str(value) => Ok(value.to_string()),
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String(value) => Ok(value),
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token => self.syntax_error(token),
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}
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}
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#[inline]
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fn expect_option<
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T: Deserializable
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>(&mut self, token: Token) -> Result<Option<T>, E> {
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match token {
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Option(false) => Ok(None),
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Option(true) => {
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let value: T = try!(Deserializable::deserialize(self));
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Ok(Some(value))
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}
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token => self.syntax_error(token),
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}
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}
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#[inline]
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fn expect_tuple_start(&mut self, token: Token) -> Result<uint, E> {
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match token {
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TupleStart(len) => Ok(len),
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token => self.syntax_error(token),
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}
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}
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#[inline]
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fn expect_tuple_elt<
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T: Deserializable
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>(&mut self) -> Result<T, E> {
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Deserializable::deserialize(self)
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}
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#[inline]
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fn expect_tuple_end(&mut self) -> Result<(), E> {
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match try!(self.expect_token()) {
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End => Ok(()),
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token => self.syntax_error(token),
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}
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}
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#[inline]
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fn expect_struct_start(&mut self, token: Token, name: &str) -> Result<(), E> {
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match token {
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StructStart(n, _) => {
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if name == n {
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Ok(())
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} else {
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self.syntax_error(token)
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}
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}
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_ => self.syntax_error(token),
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}
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}
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#[inline]
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fn expect_struct_field<
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T: Deserializable
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>(&mut self, name: &str) -> Result<T, E> {
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match try!(self.expect_token()) {
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Str(n) => {
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if name != n {
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return self.syntax_error(Str(n));
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}
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}
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String(n) => {
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if name != n.as_slice() {
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return self.syntax_error(String(n));
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}
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}
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token => { return self.syntax_error(token); }
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}
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Deserializable::deserialize(self)
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}
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#[inline]
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fn expect_struct_end(&mut self) -> Result<(), E> {
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match try!(self.expect_token()) {
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End => Ok(()),
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token => self.syntax_error(token),
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}
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}
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#[inline]
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fn expect_enum_start(&mut self, token: Token, name: &str, variants: &[&str]) -> Result<uint, E> {
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match token {
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EnumStart(n, v, _) => {
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if name == n {
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match variants.iter().position(|variant| *variant == v) {
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Some(position) => Ok(position),
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None => self.syntax_error(token),
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}
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} else {
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self.syntax_error(token)
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}
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}
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_ => self.syntax_error(token),
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}
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}
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#[inline]
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fn expect_enum_elt<
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T: Deserializable
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>(&mut self) -> Result<T, E> {
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Deserializable::deserialize(self)
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}
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#[inline]
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fn expect_enum_end(&mut self) -> Result<(), E> {
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match try!(self.expect_token()) {
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End => Ok(()),
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token => self.syntax_error(token),
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}
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}
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#[inline]
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fn expect_seq_start(&mut self, token: Token) -> Result<uint, E> {
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match token {
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TupleStart(len) => Ok(len),
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SeqStart(len) => Ok(len),
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token => self.syntax_error(token),
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}
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}
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#[inline]
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fn expect_seq_elt_or_end<
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T: Deserializable
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>(&mut self) -> Result<Option<T>, E> {
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match try!(self.expect_token()) {
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End => Ok(None),
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token => {
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let value = try!(Deserializable::deserialize_token(self, token));
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Ok(Some(value))
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}
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}
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}
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#[inline]
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fn expect_seq<
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'a,
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T: Deserializable,
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C: FromIterator<T>
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>(&'a mut self, token: Token) -> Result<C, E> {
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let len = try!(self.expect_seq_start(token));
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let mut d: SeqDeserializer<'a, Self, E> = SeqDeserializer {
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d: self,
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len: len,
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err: None,
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};
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let collection: C = d.collect();
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match d.err {
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Some(err) => Err(err),
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None => Ok(collection),
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}
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}
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#[inline]
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fn expect_map_start(&mut self, token: Token) -> Result<uint, E> {
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match token {
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MapStart(len) => Ok(len),
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_ => self.syntax_error(token),
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}
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}
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#[inline]
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fn expect_map_elt_or_end<
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K: Deserializable,
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V: Deserializable
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>(&mut self) -> Result<Option<(K, V)>, E> {
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match try!(self.expect_token()) {
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End => Ok(None),
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token => {
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let key = try!(Deserializable::deserialize_token(self, token));
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let value = try!(Deserializable::deserialize(self));
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Ok(Some((key, value)))
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}
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}
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}
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#[inline]
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fn expect_map<
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'a,
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K: Deserializable,
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V: Deserializable,
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C: FromIterator<(K, V)>
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>(&'a mut self, token: Token) -> Result<C, E> {
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let len = try!(self.expect_map_start(token));
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let mut d: MapDeserializer<'a, Self, E> = MapDeserializer {
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d: self,
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len: len,
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err: None,
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};
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let collection: C = d.collect();
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match d.err {
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Some(err) => Err(err),
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None => Ok(collection),
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}
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}
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}
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//////////////////////////////////////////////////////////////////////////////
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struct SeqDeserializer<'a, D, E> {
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d: &'a mut D,
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len: uint,
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err: Option<E>,
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}
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impl<
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'a,
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T: Deserializable,
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D: Deserializer<E>,
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E
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> Iterator<T> for SeqDeserializer<'a, D, E> {
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#[inline]
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fn next(&mut self) -> Option<T> {
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match self.d.expect_seq_elt_or_end() {
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Ok(next) => next,
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Err(err) => {
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self.err = Some(err);
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None
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}
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}
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}
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#[inline]
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fn size_hint(&self) -> (uint, Option<uint>) {
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(self.len, Some(self.len))
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}
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}
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//////////////////////////////////////////////////////////////////////////////
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struct MapDeserializer<'a, D, E> {
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d: &'a mut D,
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len: uint,
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err: Option<E>,
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}
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impl<
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'a,
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K: Deserializable,
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V: Deserializable,
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D: Deserializer<E>,
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E
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> Iterator<(K, V)> for MapDeserializer<'a, D, E> {
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#[inline]
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fn next(&mut self) -> Option<(K, V)> {
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match self.d.expect_map_elt_or_end() {
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Ok(next) => next,
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Err(err) => {
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self.err = Some(err);
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None
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}
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}
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}
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#[inline]
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fn size_hint(&self) -> (uint, Option<uint>) {
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(self.len, Some(self.len))
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}
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}
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//////////////////////////////////////////////////////////////////////////////
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pub trait Deserializable {
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#[inline]
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fn deserialize<
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D: Deserializer<E>,
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E
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>(d: &mut D) -> Result<Self, E> {
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let token = try!(d.expect_token());
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Deserializable::deserialize_token(d, token)
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}
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fn deserialize_token<
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D: Deserializer<E>,
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E
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>(d: &mut D, token: Token) -> Result<Self, E>;
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}
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//////////////////////////////////////////////////////////////////////////////
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macro_rules! impl_deserializable {
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($ty:ty, $method:ident) => {
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impl Deserializable for $ty {
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#[inline]
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fn deserialize_token<
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D: Deserializer<E>,
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E
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>(d: &mut D, token: Token) -> Result<$ty, E> {
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d.$method(token)
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}
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}
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}
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}
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impl_deserializable!(bool, expect_bool)
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impl_deserializable!(int, expect_num)
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impl_deserializable!(i8, expect_num)
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impl_deserializable!(i16, expect_num)
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impl_deserializable!(i32, expect_num)
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impl_deserializable!(i64, expect_num)
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impl_deserializable!(uint, expect_num)
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impl_deserializable!(u8, expect_num)
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impl_deserializable!(u16, expect_num)
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impl_deserializable!(u32, expect_num)
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impl_deserializable!(u64, expect_num)
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impl_deserializable!(f32, expect_num)
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impl_deserializable!(f64, expect_num)
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impl_deserializable!(char, expect_char)
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impl_deserializable!(&'static str, expect_str)
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impl_deserializable!(String, expect_string)
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|
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|
//////////////////////////////////////////////////////////////////////////////
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impl<T: Deserializable> Deserializable for Box<T> {
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#[inline]
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fn deserialize_token<
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D: Deserializer<E>,
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E
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>(d: &mut D, token: Token) -> Result<Box<T>, E> {
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Ok(box try!(Deserializable::deserialize_token(d, token)))
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}
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}
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impl<T: Deserializable + 'static> Deserializable for Gc<T> {
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#[inline]
|
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fn deserialize_token<
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D: Deserializer<E>,
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E
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>(d: &mut D, token: Token) -> Result<Gc<T>, E> {
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Ok(box (GC) try!(Deserializable::deserialize_token(d, token)))
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}
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}
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impl<T: Deserializable> Deserializable for Rc<T> {
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#[inline]
|
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fn deserialize_token<
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D: Deserializer<E>,
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E
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>(d: &mut D, token: Token) -> Result<Rc<T>, E> {
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Ok(Rc::new(try!(Deserializable::deserialize_token(d, token))))
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}
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}
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impl<T: Deserializable + Send + Share> Deserializable for Arc<T> {
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#[inline]
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fn deserialize_token<
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D: Deserializer<E>,
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E
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>(d: &mut D, token: Token) -> Result<Arc<T>, E> {
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Ok(Arc::new(try!(Deserializable::deserialize_token(d, token))))
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}
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}
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//////////////////////////////////////////////////////////////////////////////
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impl<T: Deserializable> Deserializable for Option<T> {
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#[inline]
|
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fn deserialize_token<
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D: Deserializer<E>,
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E
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>(d: &mut D, token: Token) -> Result<Option<T>, E> {
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d.expect_option(token)
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}
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}
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//////////////////////////////////////////////////////////////////////////////
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macro_rules! deserialize_seq {
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($seq:expr) => {
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{
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loop {
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match d.next() {
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Some(Ok(End)) => { break; }
|
|
Some(Ok(token)) => {
|
|
let v = try!(Deserializable::deserialize_token(d, token));
|
|
$seq.push(v)
|
|
}
|
|
Some(Err(err)) => { return Err(err); }
|
|
None => { return d.end_of_stream_error(); }
|
|
}
|
|
}
|
|
|
|
Ok($seq)
|
|
}
|
|
}
|
|
}
|
|
|
|
impl<T: Deserializable> Deserializable for Vec<T> {
|
|
#[inline]
|
|
fn deserialize_token<
|
|
D: Deserializer<E>,
|
|
E
|
|
>(d: &mut D, token: Token) -> Result<Vec<T>, E> {
|
|
d.expect_seq(token)
|
|
}
|
|
}
|
|
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
|
|
impl<
|
|
K: Deserializable + Eq + Hash,
|
|
V: Deserializable
|
|
> Deserializable for HashMap<K, V> {
|
|
#[inline]
|
|
fn deserialize_token<
|
|
D: Deserializer<E>,
|
|
E
|
|
>(d: &mut D, token: Token) -> Result<HashMap<K, V>, E> {
|
|
d.expect_map(token)
|
|
}
|
|
}
|
|
|
|
impl<
|
|
K: Deserializable + Ord,
|
|
V: Deserializable
|
|
> Deserializable for TreeMap<K, V> {
|
|
#[inline]
|
|
fn deserialize_token<
|
|
D: Deserializer<E>,
|
|
E
|
|
>(d: &mut D, token: Token) -> Result<TreeMap<K, V>, E> {
|
|
d.expect_map(token)
|
|
}
|
|
}
|
|
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
|
|
macro_rules! peel {
|
|
($name:ident, $($other:ident,)*) => (impl_deserialize_tuple!($($other,)*))
|
|
}
|
|
|
|
macro_rules! impl_deserialize_tuple {
|
|
() => {
|
|
impl Deserializable for () {
|
|
#[inline]
|
|
fn deserialize_token<
|
|
D: Deserializer<E>,
|
|
E
|
|
>(d: &mut D, token: Token) -> Result<(), E> {
|
|
d.expect_null(token)
|
|
}
|
|
}
|
|
};
|
|
( $($name:ident,)+ ) => {
|
|
impl<
|
|
$($name: Deserializable),*
|
|
> Deserializable for ($($name,)*) {
|
|
#[inline]
|
|
#[allow(uppercase_variables)]
|
|
fn deserialize_token<
|
|
D: Deserializer<E>,
|
|
E
|
|
>(d: &mut D, token: Token) -> Result<($($name,)*), E> {
|
|
try!(d.expect_tuple_start(token));
|
|
|
|
let result = ($({
|
|
let $name = try!(d.expect_tuple_elt());
|
|
$name
|
|
},)*);
|
|
|
|
try!(d.expect_tuple_end());
|
|
|
|
Ok(result)
|
|
}
|
|
}
|
|
peel!($($name,)*)
|
|
}
|
|
}
|
|
|
|
impl_deserialize_tuple! { T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, }
|
|
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
|
|
/// Helper struct that will ignore tokens while taking in consideration
|
|
/// recursive structures.
|
|
pub struct IgnoreTokens;
|
|
|
|
impl Deserializable for IgnoreTokens {
|
|
#[inline]
|
|
fn deserialize_token<
|
|
D: Deserializer<E>,
|
|
E
|
|
>(d: &mut D, token: Token) -> Result<IgnoreTokens, E> {
|
|
match token {
|
|
Option(true) => {
|
|
Deserializable::deserialize(d)
|
|
}
|
|
|
|
EnumStart(_, _, _) => {
|
|
loop {
|
|
match try!(d.expect_token()) {
|
|
End => { return Ok(IgnoreTokens); }
|
|
token => {
|
|
let _: IgnoreTokens = try!(Deserializable::deserialize_token(d, token));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
StructStart(_, _) => {
|
|
loop {
|
|
match try!(d.expect_token()) {
|
|
End => { return Ok(IgnoreTokens); }
|
|
Str(_) | String(_) => {
|
|
let _: IgnoreTokens = try!(Deserializable::deserialize(d));
|
|
}
|
|
_token => { return d.syntax_error(token); }
|
|
}
|
|
}
|
|
}
|
|
|
|
TupleStart(_) => {
|
|
loop {
|
|
match try!(d.expect_token()) {
|
|
End => { return Ok(IgnoreTokens); }
|
|
token => {
|
|
let _: IgnoreTokens = try!(Deserializable::deserialize_token(d, token));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
SeqStart(_) => {
|
|
loop {
|
|
match try!(d.expect_token()) {
|
|
End => { return Ok(IgnoreTokens); }
|
|
token => {
|
|
let _: IgnoreTokens = try!(Deserializable::deserialize_token(d, token));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
MapStart(_) => {
|
|
loop {
|
|
match try!(d.expect_token()) {
|
|
End => { return Ok(IgnoreTokens); }
|
|
token => {
|
|
let _: IgnoreTokens = try!(Deserializable::deserialize_token(d, token));
|
|
let _: IgnoreTokens = try!(Deserializable::deserialize(d));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
End => d.syntax_error(token),
|
|
|
|
_ => Ok(IgnoreTokens),
|
|
}
|
|
}
|
|
}
|
|
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
|
|
/// Helper struct that will gather tokens while taking in consideration
|
|
/// recursive structures.
|
|
pub struct GatherTokens {
|
|
tokens: Vec<Token>,
|
|
}
|
|
|
|
impl GatherTokens {
|
|
#[inline]
|
|
pub fn unwrap(self) -> Vec<Token> {
|
|
self.tokens
|
|
}
|
|
|
|
#[inline]
|
|
fn gather<D: Deserializer<E>, E>(&mut self, d: &mut D) -> Result<(), E> {
|
|
let token = try!(d.expect_token());
|
|
self.gather_token(d, token)
|
|
}
|
|
|
|
#[inline]
|
|
fn gather_token<D: Deserializer<E>, E>(&mut self, d: &mut D, token: Token) -> Result<(), E> {
|
|
match token {
|
|
token @ Option(true) => {
|
|
self.tokens.push(token);
|
|
self.gather(d)
|
|
}
|
|
EnumStart(name, variant, len) => {
|
|
self.tokens.reserve_additional(len + 1);
|
|
self.tokens.push(EnumStart(name, variant, len));
|
|
self.gather_seq(d)
|
|
}
|
|
StructStart(name, len) => {
|
|
self.tokens.reserve_additional(len + 1);
|
|
self.tokens.push(StructStart(name, len));
|
|
self.gather_struct(d)
|
|
}
|
|
TupleStart(len) => {
|
|
self.tokens.reserve_additional(len + 1);
|
|
self.tokens.push(TupleStart(len));
|
|
self.gather_seq(d)
|
|
}
|
|
SeqStart(len) => {
|
|
self.tokens.reserve_additional(len + 1);
|
|
self.tokens.push(SeqStart(len));
|
|
self.gather_seq(d)
|
|
}
|
|
MapStart(len) => {
|
|
self.tokens.reserve_additional(len + 1);
|
|
self.tokens.push(MapStart(len));
|
|
self.gather_map(d)
|
|
}
|
|
End => {
|
|
d.syntax_error(token)
|
|
}
|
|
token => {
|
|
self.tokens.push(token);
|
|
Ok(())
|
|
}
|
|
}
|
|
}
|
|
|
|
#[inline]
|
|
fn gather_seq<D: Deserializer<E>, E>(&mut self, d: &mut D) -> Result<(), E> {
|
|
loop {
|
|
match try!(d.expect_token()) {
|
|
token @ End => {
|
|
self.tokens.push(token);
|
|
return Ok(());
|
|
}
|
|
token => {
|
|
try!(self.gather_token(d, token));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
#[inline]
|
|
fn gather_struct<D: Deserializer<E>, E>(&mut self, d: &mut D) -> Result<(), E> {
|
|
loop {
|
|
match try!(d.expect_token()) {
|
|
token @ End => {
|
|
self.tokens.push(token);
|
|
return Ok(());
|
|
}
|
|
token @ Str(_) | token @ String(_) => {
|
|
self.tokens.push(token);
|
|
try!(self.gather(d))
|
|
}
|
|
token => { return d.syntax_error(token); }
|
|
}
|
|
}
|
|
}
|
|
|
|
#[inline]
|
|
fn gather_map<D: Deserializer<E>, E>(&mut self, d: &mut D) -> Result<(), E> {
|
|
loop {
|
|
match try!(d.expect_token()) {
|
|
End => {
|
|
self.tokens.push(End);
|
|
return Ok(());
|
|
}
|
|
token => {
|
|
try!(self.gather_token(d, token));
|
|
try!(self.gather(d))
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
impl Deserializable for GatherTokens {
|
|
#[inline]
|
|
fn deserialize_token<
|
|
D: Deserializer<E>,
|
|
E
|
|
>(d: &mut D, token: Token) -> Result<GatherTokens, E> {
|
|
let mut tokens = GatherTokens {
|
|
tokens: vec!(),
|
|
};
|
|
try!(tokens.gather_token(d, token));
|
|
Ok(tokens)
|
|
}
|
|
}
|
|
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
|
|
#[cfg(test)]
|
|
mod tests {
|
|
use std::collections::TreeMap;
|
|
use serialize::Decoder;
|
|
|
|
use super::{Deserializer, Deserializable, Token};
|
|
use super::{
|
|
Null,
|
|
Bool,
|
|
Int,
|
|
I8,
|
|
I16,
|
|
I32,
|
|
I64,
|
|
Uint,
|
|
U8,
|
|
U16,
|
|
U32,
|
|
U64,
|
|
F32,
|
|
F64,
|
|
Char,
|
|
Str,
|
|
String,
|
|
Option,
|
|
TupleStart,
|
|
StructStart,
|
|
EnumStart,
|
|
SeqStart,
|
|
MapStart,
|
|
End,
|
|
};
|
|
|
|
macro_rules! treemap {
|
|
($($k:expr => $v:expr),*) => ({
|
|
let mut _m = ::std::collections::TreeMap::new();
|
|
$(_m.insert($k, $v);)*
|
|
_m
|
|
})
|
|
}
|
|
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
|
|
#[deriving(Clone, PartialEq, Show, Decodable)]
|
|
struct Inner {
|
|
a: (),
|
|
b: uint,
|
|
c: TreeMap<String, Option<char>>,
|
|
}
|
|
|
|
impl Deserializable for Inner {
|
|
#[inline]
|
|
fn deserialize_token<
|
|
D: Deserializer<E>, E
|
|
>(d: &mut D, token: Token) -> Result<Inner, E> {
|
|
try!(d.expect_struct_start(token, "Inner"));
|
|
let a = try!(d.expect_struct_field("a"));
|
|
let b = try!(d.expect_struct_field("b"));
|
|
let c = try!(d.expect_struct_field("c"));
|
|
try!(d.expect_struct_end());
|
|
Ok(Inner { a: a, b: b, c: c })
|
|
}
|
|
}
|
|
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
|
|
#[deriving(Clone, PartialEq, Show, Decodable)]
|
|
struct Outer {
|
|
inner: Vec<Inner>,
|
|
}
|
|
|
|
impl Deserializable for Outer {
|
|
#[inline]
|
|
fn deserialize_token<
|
|
D: Deserializer<E>, E
|
|
>(d: &mut D, token: Token) -> Result<Outer, E> {
|
|
try!(d.expect_struct_start(token, "Outer"));
|
|
let inner = try!(d.expect_struct_field("inner"));
|
|
try!(d.expect_struct_end());
|
|
Ok(Outer { inner: inner })
|
|
}
|
|
}
|
|
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
|
|
#[deriving(Clone, PartialEq, Show, Decodable)]
|
|
enum Animal {
|
|
Dog,
|
|
Frog(String, int)
|
|
}
|
|
|
|
impl Deserializable for Animal {
|
|
#[inline]
|
|
fn deserialize_token<
|
|
D: Deserializer<E>, E
|
|
>(d: &mut D, token: Token) -> Result<Animal, E> {
|
|
match try!(d.expect_enum_start(token, "Animal", ["Dog", "Frog"])) {
|
|
0 => {
|
|
try!(d.expect_enum_end());
|
|
Ok(Dog)
|
|
}
|
|
1 => {
|
|
let x0 = try!(Deserializable::deserialize(d));
|
|
let x1 = try!(Deserializable::deserialize(d));
|
|
try!(d.expect_enum_end());
|
|
Ok(Frog(x0, x1))
|
|
}
|
|
_ => unreachable!(),
|
|
}
|
|
}
|
|
}
|
|
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
|
|
#[deriving(Show)]
|
|
enum Error {
|
|
EndOfStream,
|
|
SyntaxError,
|
|
IncompleteValue,
|
|
}
|
|
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
|
|
struct TokenDeserializer<Iter> {
|
|
tokens: Iter,
|
|
}
|
|
|
|
impl<Iter: Iterator<Token>> TokenDeserializer<Iter> {
|
|
#[inline]
|
|
fn new(tokens: Iter) -> TokenDeserializer<Iter> {
|
|
TokenDeserializer {
|
|
tokens: tokens,
|
|
}
|
|
}
|
|
}
|
|
|
|
impl<Iter: Iterator<Token>> Iterator<Result<Token, Error>> for TokenDeserializer<Iter> {
|
|
#[inline]
|
|
fn next(&mut self) -> Option<Result<Token, Error>> {
|
|
match self.tokens.next() {
|
|
None => None,
|
|
Some(token) => Some(Ok(token)),
|
|
}
|
|
}
|
|
}
|
|
|
|
impl<Iter: Iterator<Token>> Deserializer<Error> for TokenDeserializer<Iter> {
|
|
fn end_of_stream_error<T>(&self) -> Result<T, Error> {
|
|
Err(EndOfStream)
|
|
}
|
|
|
|
fn syntax_error<T>(&self, _token: Token) -> Result<T, Error> {
|
|
Err(SyntaxError)
|
|
}
|
|
|
|
fn missing_field_error<T>(&self, _field: &'static str) -> Result<T, Error> {
|
|
Err(IncompleteValue)
|
|
}
|
|
}
|
|
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
|
|
macro_rules! test_value {
|
|
($name:ident, [$($tokens:expr => $value:expr: $ty:ty),*]) => {
|
|
#[test]
|
|
fn $name() {
|
|
$(
|
|
let mut deserializer = TokenDeserializer::new($tokens.move_iter());
|
|
let value: $ty = Deserializable::deserialize(&mut deserializer).unwrap();
|
|
|
|
assert_eq!(value, $value);
|
|
)+
|
|
}
|
|
}
|
|
}
|
|
|
|
test_value!(test_primitives, [
|
|
vec!(Null) => (): (),
|
|
vec!(Bool(true)) => true: bool,
|
|
vec!(Bool(false)) => false: bool,
|
|
vec!(Int(5)) => 5: int,
|
|
vec!(I8(5)) => 5: i8,
|
|
vec!(I16(5)) => 5: i16,
|
|
vec!(I32(5)) => 5: i32,
|
|
vec!(I64(5)) => 5: i64,
|
|
vec!(Uint(5)) => 5: uint,
|
|
vec!(U8(5)) => 5: u8,
|
|
vec!(U16(5)) => 5: u16,
|
|
vec!(U32(5)) => 5: u32,
|
|
vec!(U64(5)) => 5: u64,
|
|
vec!(F32(5.0)) => 5.0: f32,
|
|
vec!(F64(5.0)) => 5.0: f64,
|
|
vec!(Char('c')) => 'c': char,
|
|
vec!(Str("abc")) => "abc": &str,
|
|
vec!(String("abc".to_string())) => "abc".to_string(): String
|
|
])
|
|
|
|
test_value!(test_tuples, [
|
|
vec!(
|
|
TupleStart(0),
|
|
End,
|
|
) => (): (),
|
|
|
|
vec!(
|
|
TupleStart(2),
|
|
Int(5),
|
|
|
|
Str("a"),
|
|
End,
|
|
) => (5, "a"): (int, &'static str),
|
|
|
|
vec!(
|
|
TupleStart(3),
|
|
Null,
|
|
|
|
TupleStart(0),
|
|
End,
|
|
|
|
TupleStart(2),
|
|
Int(5),
|
|
|
|
Str("a"),
|
|
End,
|
|
End,
|
|
) => ((), (), (5, "a")): ((), (), (int, &'static str))
|
|
])
|
|
|
|
test_value!(test_options, [
|
|
vec!(Option(false)) => None: Option<int>,
|
|
|
|
vec!(
|
|
Option(true),
|
|
Int(5),
|
|
) => Some(5): Option<int>
|
|
])
|
|
|
|
test_value!(test_structs, [
|
|
vec!(
|
|
StructStart("Outer", 1),
|
|
Str("inner"),
|
|
SeqStart(0),
|
|
End,
|
|
End,
|
|
) => Outer { inner: vec!() }: Outer,
|
|
|
|
vec!(
|
|
StructStart("Outer", 1),
|
|
Str("inner"),
|
|
SeqStart(1),
|
|
StructStart("Inner", 3),
|
|
Str("a"),
|
|
Null,
|
|
|
|
Str("b"),
|
|
Uint(5),
|
|
|
|
Str("c"),
|
|
MapStart(1),
|
|
String("abc".to_string()),
|
|
|
|
Option(true),
|
|
Char('c'),
|
|
End,
|
|
End,
|
|
End,
|
|
End,
|
|
) => Outer {
|
|
inner: vec!(
|
|
Inner {
|
|
a: (),
|
|
b: 5,
|
|
c: treemap!("abc".to_string() => Some('c')),
|
|
},
|
|
),
|
|
}: Outer
|
|
])
|
|
|
|
test_value!(test_enums, [
|
|
vec!(
|
|
EnumStart("Animal", "Dog", 0),
|
|
End,
|
|
) => Dog: Animal,
|
|
|
|
vec!(
|
|
EnumStart("Animal", "Frog", 2),
|
|
String("Henry".to_string()),
|
|
Int(349),
|
|
End,
|
|
) => Frog("Henry".to_string(), 349): Animal
|
|
])
|
|
|
|
test_value!(test_vecs, [
|
|
vec!(
|
|
SeqStart(0),
|
|
End,
|
|
) => vec!(): Vec<int>,
|
|
|
|
vec!(
|
|
SeqStart(3),
|
|
Int(5),
|
|
|
|
Int(6),
|
|
|
|
Int(7),
|
|
End,
|
|
) => vec!(5, 6, 7): Vec<int>,
|
|
|
|
|
|
vec!(
|
|
SeqStart(3),
|
|
SeqStart(1),
|
|
Int(1),
|
|
End,
|
|
|
|
SeqStart(2),
|
|
Int(2),
|
|
|
|
Int(3),
|
|
End,
|
|
|
|
SeqStart(3),
|
|
Int(4),
|
|
|
|
Int(5),
|
|
|
|
Int(6),
|
|
End,
|
|
End,
|
|
) => vec!(vec!(1), vec!(2, 3), vec!(4, 5, 6)): Vec<Vec<int>>
|
|
])
|
|
|
|
test_value!(test_treemaps, [
|
|
vec!(
|
|
MapStart(0),
|
|
End,
|
|
) => treemap!(): TreeMap<int, String>,
|
|
|
|
vec!(
|
|
MapStart(2),
|
|
Int(5),
|
|
String("a".to_string()),
|
|
|
|
Int(6),
|
|
String("b".to_string()),
|
|
End,
|
|
) => treemap!(5i => "a".to_string(), 6i => "b".to_string()): TreeMap<int, String>
|
|
])
|
|
}
|