866 lines
23 KiB
Rust
866 lines
23 KiB
Rust
#![feature(custom_derive, plugin, test)]
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#![plugin(serde_macros)]
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extern crate test;
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extern crate serde;
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use std::collections::{BTreeMap, BTreeSet, HashMap, HashSet};
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use std::iter;
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use std::vec;
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use serde::de::{self, Deserialize, Deserializer, Visitor};
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#[derive(Debug)]
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enum Token {
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Bool(bool),
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Isize(isize),
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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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Usize(usize),
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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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Name(&'static str),
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Unit,
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SeqStart(usize),
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SeqSep,
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SeqEnd,
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MapStart(usize),
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MapSep,
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MapEnd,
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EnumStart(&'static str),
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EnumEnd,
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}
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struct TokenDeserializer {
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tokens: iter::Peekable<vec::IntoIter<Token>>,
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}
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impl<'a> TokenDeserializer {
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fn new(tokens: Vec<Token>) -> TokenDeserializer {
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TokenDeserializer {
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tokens: tokens.into_iter().peekable(),
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}
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}
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}
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#[derive(Clone, PartialEq, Debug)]
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enum Error {
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SyntaxError,
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EndOfStreamError,
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UnknownFieldError(String),
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MissingFieldError(&'static str),
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InvalidName(&'static str),
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}
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impl de::Error for Error {
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fn syntax_error() -> Error { Error::SyntaxError }
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fn end_of_stream_error() -> Error { Error::EndOfStreamError }
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fn unknown_field_error(field: &str) -> Error {
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Error::UnknownFieldError(field.to_string())
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}
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fn missing_field_error(field: &'static str) -> Error {
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Error::MissingFieldError(field)
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}
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}
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impl Deserializer for TokenDeserializer {
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type Error = Error;
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fn visit<V>(&mut self, mut visitor: V) -> Result<V::Value, Error>
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where V: Visitor,
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{
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match self.tokens.next() {
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Some(Token::Bool(v)) => visitor.visit_bool(v),
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Some(Token::Isize(v)) => visitor.visit_isize(v),
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Some(Token::I8(v)) => visitor.visit_i8(v),
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Some(Token::I16(v)) => visitor.visit_i16(v),
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Some(Token::I32(v)) => visitor.visit_i32(v),
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Some(Token::I64(v)) => visitor.visit_i64(v),
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Some(Token::Usize(v)) => visitor.visit_usize(v),
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Some(Token::U8(v)) => visitor.visit_u8(v),
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Some(Token::U16(v)) => visitor.visit_u16(v),
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Some(Token::U32(v)) => visitor.visit_u32(v),
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Some(Token::U64(v)) => visitor.visit_u64(v),
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Some(Token::F32(v)) => visitor.visit_f32(v),
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Some(Token::F64(v)) => visitor.visit_f64(v),
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Some(Token::Char(v)) => visitor.visit_char(v),
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Some(Token::Str(v)) => visitor.visit_str(v),
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Some(Token::String(v)) => visitor.visit_string(v),
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Some(Token::Option(false)) => visitor.visit_none(),
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Some(Token::Option(true)) => visitor.visit_some(self),
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Some(Token::Unit) => visitor.visit_unit(),
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Some(Token::SeqStart(len)) => {
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visitor.visit_seq(TokenDeserializerSeqVisitor {
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de: self,
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len: len,
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})
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}
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Some(Token::MapStart(len)) => {
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visitor.visit_map(TokenDeserializerMapVisitor {
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de: self,
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len: len,
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})
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}
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Some(Token::Name(_)) => self.visit(visitor),
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Some(_) => Err(Error::SyntaxError),
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None => Err(Error::EndOfStreamError),
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}
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}
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/// Hook into `Option` deserializing so we can treat `Unit` as a
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/// `None`, or a regular value as `Some(value)`.
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fn visit_option<V>(&mut self, mut visitor: V) -> Result<V::Value, Error>
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where V: Visitor,
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{
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match self.tokens.peek() {
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Some(&Token::Option(false)) => {
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self.tokens.next();
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visitor.visit_none()
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}
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Some(&Token::Option(true)) => {
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self.tokens.next();
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visitor.visit_some(self)
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}
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Some(&Token::Unit) => {
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self.tokens.next();
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visitor.visit_none()
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}
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Some(_) => visitor.visit_some(self),
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None => Err(Error::EndOfStreamError),
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}
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}
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fn visit_enum<V>(&mut self, name: &str, mut visitor: V) -> Result<V::Value, Error>
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where V: de::EnumVisitor,
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{
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match self.tokens.next() {
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Some(Token::EnumStart(n)) => {
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if name == n {
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visitor.visit(TokenDeserializerVariantVisitor {
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de: self,
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})
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} else {
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Err(Error::SyntaxError)
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}
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}
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Some(_) => Err(Error::SyntaxError),
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None => Err(Error::EndOfStreamError),
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}
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}
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fn visit_named_unit<V>(&mut self, name: &str, visitor: V) -> Result<V::Value, Error>
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where V: de::Visitor,
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{
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match self.tokens.peek() {
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Some(&Token::Name(n)) => {
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if name == n {
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self.tokens.next();
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self.visit_seq(visitor)
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} else {
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Err(Error::InvalidName(n))
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}
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}
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Some(_) => self.visit(visitor),
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None => Err(Error::EndOfStreamError),
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}
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}
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fn visit_named_seq<V>(&mut self, name: &str, visitor: V) -> Result<V::Value, Error>
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where V: de::Visitor,
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{
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match self.tokens.peek() {
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Some(&Token::Name(n)) => {
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if name == n {
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self.tokens.next();
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self.visit_seq(visitor)
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} else {
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Err(Error::InvalidName(n))
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}
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}
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Some(_) => self.visit_seq(visitor),
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None => Err(Error::EndOfStreamError),
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}
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}
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fn visit_named_map<V>(&mut self, name: &str, visitor: V) -> Result<V::Value, Error>
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where V: de::Visitor,
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{
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match self.tokens.peek() {
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Some(&Token::Name(n)) => {
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if name == n {
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self.tokens.next();
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self.visit_map(visitor)
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} else {
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Err(Error::InvalidName(n))
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}
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}
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Some(_) => self.visit_map(visitor),
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None => Err(Error::EndOfStreamError),
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}
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}
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}
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//////////////////////////////////////////////////////////////////////////
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struct TokenDeserializerSeqVisitor<'a> {
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de: &'a mut TokenDeserializer,
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len: usize,
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}
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impl<'a> de::SeqVisitor for TokenDeserializerSeqVisitor<'a> {
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type Error = Error;
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fn visit<T>(&mut self) -> Result<Option<T>, Error>
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where T: Deserialize,
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{
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match self.de.tokens.peek() {
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Some(&Token::SeqSep) => {
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self.len -= 1;
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self.de.tokens.next();
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Ok(Some(try!(Deserialize::deserialize(self.de))))
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}
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Some(&Token::SeqEnd) => Ok(None),
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Some(_) => {
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Err(Error::SyntaxError)
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}
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None => Err(Error::EndOfStreamError),
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}
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}
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fn end(&mut self) -> Result<(), Error> {
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assert_eq!(self.len, 0);
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match self.de.tokens.next() {
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Some(Token::SeqEnd) => Ok(()),
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Some(_) => Err(Error::SyntaxError),
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None => Err(Error::EndOfStreamError),
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}
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}
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fn size_hint(&self) -> (usize, Option<usize>) {
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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 TokenDeserializerMapVisitor<'a> {
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de: &'a mut TokenDeserializer,
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len: usize,
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}
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impl<'a> de::MapVisitor for TokenDeserializerMapVisitor<'a> {
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type Error = Error;
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fn visit_key<K>(&mut self) -> Result<Option<K>, Error>
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where K: Deserialize,
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{
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match self.de.tokens.peek() {
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Some(&Token::MapSep) => {
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self.de.tokens.next();
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self.len -= 1;
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Ok(Some(try!(Deserialize::deserialize(self.de))))
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}
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Some(&Token::MapEnd) => Ok(None),
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Some(_) => Err(Error::SyntaxError),
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None => Err(Error::EndOfStreamError),
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}
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}
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fn visit_value<V>(&mut self) -> Result<V, Error>
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where V: Deserialize,
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{
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Ok(try!(Deserialize::deserialize(self.de)))
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}
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fn end(&mut self) -> Result<(), Error> {
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assert_eq!(self.len, 0);
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match self.de.tokens.next() {
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Some(Token::MapEnd) => Ok(()),
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Some(_) => Err(Error::SyntaxError),
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None => Err(Error::EndOfStreamError),
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}
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}
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fn size_hint(&self) -> (usize, Option<usize>) {
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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 TokenDeserializerVariantVisitor<'a> {
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de: &'a mut TokenDeserializer,
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}
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impl<'a> de::VariantVisitor for TokenDeserializerVariantVisitor<'a> {
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type Error = Error;
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fn visit_variant<V>(&mut self) -> Result<V, Error>
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where V: de::Deserialize,
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{
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de::Deserialize::deserialize(self.de)
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}
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fn visit_unit(&mut self) -> Result<(), Error> {
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de::Deserialize::deserialize(self.de)
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}
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fn visit_seq<V>(&mut self, visitor: V) -> Result<V::Value, Error>
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where V: de::Visitor,
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{
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de::Deserializer::visit(self.de, visitor)
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}
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fn visit_map<V>(&mut self, visitor: V) -> Result<V::Value, Error>
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where V: de::Visitor,
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{
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de::Deserializer::visit(self.de, visitor)
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}
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}
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//////////////////////////////////////////////////////////////////////////
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#[derive(Copy, Clone, PartialEq, Debug, Deserialize)]
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struct NamedUnit;
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#[derive(PartialEq, Debug, Deserialize)]
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struct NamedSeq(i32, i32, i32);
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#[derive(PartialEq, Debug, Deserialize)]
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struct NamedMap {
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a: i32,
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b: i32,
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c: i32,
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}
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#[derive(PartialEq, Debug, Deserialize)]
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enum Enum {
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Unit,
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Seq(i32, i32, i32),
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Map { a: i32, b: i32, c: i32 }
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}
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//////////////////////////////////////////////////////////////////////////
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macro_rules! btreeset {
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() => {
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BTreeSet::new()
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};
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($($value:expr),+) => {
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{
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let mut set = BTreeSet::new();
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$(set.insert($value);)+
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set
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}
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}
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}
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macro_rules! btreemap {
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() => {
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BTreeMap::new()
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};
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($($key:expr => $value:expr),+) => {
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{
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let mut map = BTreeMap::new();
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$(map.insert($key, $value);)+
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map
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}
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}
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}
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macro_rules! hashset {
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() => {
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HashSet::new()
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};
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($($value:expr),+) => {
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{
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let mut set = HashSet::new();
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$(set.insert($value);)+
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set
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}
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}
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}
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macro_rules! hashmap {
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() => {
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HashMap::new()
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};
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($($key:expr => $value:expr),+) => {
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{
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let mut map = HashMap::new();
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$(map.insert($key, $value);)+
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map
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}
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}
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}
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macro_rules! declare_test {
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($name:ident { $($value:expr => $tokens:expr,)+ }) => {
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#[test]
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fn $name() {
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$(
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let mut de = TokenDeserializer::new($tokens);
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let value: Result<_, Error> = Deserialize::deserialize(&mut de);
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assert_eq!(value, Ok($value));
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)+
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}
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}
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}
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macro_rules! declare_tests {
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($($name:ident { $($value:expr => $tokens:expr,)+ })+) => {
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$(
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declare_test!($name { $($value => $tokens,)+ });
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)+
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}
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}
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//////////////////////////////////////////////////////////////////////////
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declare_tests! {
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test_bool {
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true => vec![Token::Bool(true)],
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false => vec![Token::Bool(false)],
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}
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test_isize {
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0isize => vec![Token::Isize(0)],
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0isize => vec![Token::I8(0)],
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0isize => vec![Token::I16(0)],
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0isize => vec![Token::I32(0)],
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0isize => vec![Token::I64(0)],
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0isize => vec![Token::Usize(0)],
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0isize => vec![Token::U8(0)],
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0isize => vec![Token::U16(0)],
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0isize => vec![Token::U32(0)],
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0isize => vec![Token::U64(0)],
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0isize => vec![Token::F32(0.)],
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0isize => vec![Token::F64(0.)],
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}
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test_ints {
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0isize => vec![Token::Isize(0)],
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0i8 => vec![Token::I8(0)],
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0i16 => vec![Token::I16(0)],
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0i32 => vec![Token::I32(0)],
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0i64 => vec![Token::I64(0)],
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}
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test_uints {
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0usize => vec![Token::Usize(0)],
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0u8 => vec![Token::U8(0)],
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0u16 => vec![Token::U16(0)],
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0u32 => vec![Token::U32(0)],
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0u64 => vec![Token::U64(0)],
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}
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test_floats {
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0f32 => vec![Token::F32(0.)],
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0f64 => vec![Token::F64(0.)],
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}
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test_char {
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'a' => vec![Token::Char('a')],
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'a' => vec![Token::Str("a")],
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'a' => vec![Token::String("a".to_string())],
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}
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test_string {
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"abc".to_string() => vec![Token::Str("abc")],
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"abc".to_string() => vec![Token::String("abc".to_string())],
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"a".to_string() => vec![Token::Char('a')],
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}
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test_option {
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None::<i32> => vec![Token::Unit],
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None::<i32> => vec![Token::Option(false)],
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Some(1) => vec![Token::I32(1)],
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Some(1) => vec![
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Token::Option(true),
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Token::I32(1),
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],
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}
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test_unit {
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() => vec![Token::Unit],
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() => vec![
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Token::SeqStart(0),
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Token::SeqEnd,
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],
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() => vec![
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Token::Name("Anything"),
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Token::SeqStart(0),
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Token::SeqEnd,
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],
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}
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test_named_unit {
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NamedUnit => vec![Token::Unit],
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NamedUnit => vec![
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Token::Name("NamedUnit"),
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Token::Unit,
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],
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NamedUnit => vec![
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Token::SeqStart(0),
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Token::SeqEnd,
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],
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}
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test_named_seq {
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NamedSeq(1, 2, 3) => vec![
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Token::SeqStart(3),
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Token::SeqSep,
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Token::I32(1),
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Token::SeqSep,
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Token::I32(2),
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Token::SeqSep,
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Token::I32(3),
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Token::SeqEnd,
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],
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NamedSeq(1, 2, 3) => vec![
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Token::Name("NamedSeq"),
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Token::SeqStart(3),
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Token::SeqSep,
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Token::I32(1),
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Token::SeqSep,
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Token::I32(2),
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Token::SeqSep,
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Token::I32(3),
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Token::SeqEnd,
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],
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}
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test_btreeset {
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BTreeSet::<isize>::new() => vec![
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Token::Unit,
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],
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BTreeSet::<isize>::new() => vec![
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Token::SeqStart(0),
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Token::SeqEnd,
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],
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btreeset![btreeset![], btreeset![1], btreeset![2, 3]] => vec![
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Token::SeqStart(3),
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Token::SeqSep,
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Token::SeqStart(0),
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Token::SeqEnd,
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Token::SeqSep,
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Token::SeqStart(1),
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Token::SeqSep,
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Token::I32(1),
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Token::SeqEnd,
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|
|
Token::SeqSep,
|
|
Token::SeqStart(2),
|
|
Token::SeqSep,
|
|
Token::I32(2),
|
|
|
|
Token::SeqSep,
|
|
Token::I32(3),
|
|
Token::SeqEnd,
|
|
Token::SeqEnd,
|
|
],
|
|
BTreeSet::<isize>::new() => vec![
|
|
Token::Name("Anything"),
|
|
Token::Unit,
|
|
],
|
|
BTreeSet::<isize>::new() => vec![
|
|
Token::Name("Anything"),
|
|
Token::SeqStart(0),
|
|
Token::SeqEnd,
|
|
],
|
|
}
|
|
test_hashset {
|
|
HashSet::<isize>::new() => vec![
|
|
Token::Unit,
|
|
],
|
|
HashSet::<isize>::new() => vec![
|
|
Token::SeqStart(0),
|
|
Token::SeqEnd,
|
|
],
|
|
hashset![1, 2, 3] => vec![
|
|
Token::SeqStart(3),
|
|
Token::SeqSep,
|
|
Token::I32(1),
|
|
|
|
Token::SeqSep,
|
|
Token::I32(2),
|
|
|
|
Token::SeqSep,
|
|
Token::I32(3),
|
|
Token::SeqEnd,
|
|
],
|
|
HashSet::<isize>::new() => vec![
|
|
Token::Name("Anything"),
|
|
Token::Unit,
|
|
],
|
|
HashSet::<isize>::new() => vec![
|
|
Token::Name("Anything"),
|
|
Token::SeqStart(0),
|
|
Token::SeqEnd,
|
|
],
|
|
}
|
|
test_vec {
|
|
Vec::<isize>::new() => vec![
|
|
Token::Unit,
|
|
],
|
|
Vec::<isize>::new() => vec![
|
|
Token::SeqStart(0),
|
|
Token::SeqEnd,
|
|
],
|
|
vec![vec![], vec![1], vec![2, 3]] => vec![
|
|
Token::SeqStart(3),
|
|
Token::SeqSep,
|
|
Token::SeqStart(0),
|
|
Token::SeqEnd,
|
|
|
|
Token::SeqSep,
|
|
Token::SeqStart(1),
|
|
Token::SeqSep,
|
|
Token::I32(1),
|
|
Token::SeqEnd,
|
|
|
|
Token::SeqSep,
|
|
Token::SeqStart(2),
|
|
Token::SeqSep,
|
|
Token::I32(2),
|
|
|
|
Token::SeqSep,
|
|
Token::I32(3),
|
|
Token::SeqEnd,
|
|
Token::SeqEnd,
|
|
],
|
|
Vec::<isize>::new() => vec![
|
|
Token::Name("Anything"),
|
|
Token::Unit,
|
|
],
|
|
Vec::<isize>::new() => vec![
|
|
Token::Name("Anything"),
|
|
Token::SeqStart(0),
|
|
Token::SeqEnd,
|
|
],
|
|
}
|
|
test_tuple {
|
|
(1,) => vec![
|
|
Token::SeqStart(1),
|
|
Token::SeqSep,
|
|
Token::I32(1),
|
|
Token::SeqEnd,
|
|
],
|
|
(1, 2, 3) => vec![
|
|
Token::SeqStart(3),
|
|
Token::SeqSep,
|
|
Token::I32(1),
|
|
|
|
Token::SeqSep,
|
|
Token::I32(2),
|
|
|
|
Token::SeqSep,
|
|
Token::I32(3),
|
|
Token::SeqEnd,
|
|
],
|
|
}
|
|
test_btreemap {
|
|
BTreeMap::<isize, isize>::new() => vec![
|
|
Token::Unit,
|
|
],
|
|
BTreeMap::<isize, isize>::new() => vec![
|
|
Token::MapStart(0),
|
|
Token::MapEnd,
|
|
],
|
|
btreemap![1 => 2] => vec![
|
|
Token::MapStart(1),
|
|
Token::MapSep,
|
|
Token::I32(1),
|
|
Token::I32(2),
|
|
Token::MapEnd,
|
|
],
|
|
btreemap![1 => 2, 3 => 4] => vec![
|
|
Token::MapStart(2),
|
|
Token::MapSep,
|
|
Token::I32(1),
|
|
Token::I32(2),
|
|
|
|
Token::MapSep,
|
|
Token::I32(3),
|
|
Token::I32(4),
|
|
Token::MapEnd,
|
|
],
|
|
btreemap![1 => btreemap![], 2 => btreemap![3 => 4, 5 => 6]] => vec![
|
|
Token::MapStart(2),
|
|
Token::MapSep,
|
|
Token::I32(1),
|
|
Token::MapStart(0),
|
|
Token::MapEnd,
|
|
|
|
Token::MapSep,
|
|
Token::I32(2),
|
|
Token::MapStart(2),
|
|
Token::MapSep,
|
|
Token::I32(3),
|
|
Token::I32(4),
|
|
|
|
Token::MapSep,
|
|
Token::I32(5),
|
|
Token::I32(6),
|
|
Token::MapEnd,
|
|
Token::MapEnd,
|
|
],
|
|
BTreeMap::<isize, isize>::new() => vec![
|
|
Token::Name("Anything"),
|
|
Token::Unit,
|
|
],
|
|
BTreeMap::<isize, isize>::new() => vec![
|
|
Token::Name("Anything"),
|
|
Token::MapStart(0),
|
|
Token::MapEnd,
|
|
],
|
|
}
|
|
test_hashmap {
|
|
HashMap::<isize, isize>::new() => vec![
|
|
Token::Unit,
|
|
],
|
|
HashMap::<isize, isize>::new() => vec![
|
|
Token::MapStart(0),
|
|
Token::MapEnd,
|
|
],
|
|
hashmap![1 => 2] => vec![
|
|
Token::MapStart(1),
|
|
Token::MapSep,
|
|
Token::I32(1),
|
|
Token::I32(2),
|
|
Token::MapEnd,
|
|
],
|
|
hashmap![1 => 2, 3 => 4] => vec![
|
|
Token::MapStart(2),
|
|
Token::MapSep,
|
|
Token::I32(1),
|
|
Token::I32(2),
|
|
|
|
Token::MapSep,
|
|
Token::I32(3),
|
|
Token::I32(4),
|
|
Token::MapEnd,
|
|
],
|
|
hashmap![1 => hashmap![], 2 => hashmap![3 => 4, 5 => 6]] => vec![
|
|
Token::MapStart(2),
|
|
Token::MapSep,
|
|
Token::I32(1),
|
|
Token::MapStart(0),
|
|
Token::MapEnd,
|
|
|
|
Token::MapSep,
|
|
Token::I32(2),
|
|
Token::MapStart(2),
|
|
Token::MapSep,
|
|
Token::I32(3),
|
|
Token::I32(4),
|
|
|
|
Token::MapSep,
|
|
Token::I32(5),
|
|
Token::I32(6),
|
|
Token::MapEnd,
|
|
Token::MapEnd,
|
|
],
|
|
HashMap::<isize, isize>::new() => vec![
|
|
Token::Name("Anything"),
|
|
Token::Unit,
|
|
],
|
|
HashMap::<isize, isize>::new() => vec![
|
|
Token::Name("Anything"),
|
|
Token::MapStart(0),
|
|
Token::MapEnd,
|
|
],
|
|
}
|
|
test_named_map {
|
|
NamedMap { a: 1, b: 2, c: 3 } => vec![
|
|
Token::MapStart(3),
|
|
Token::MapSep,
|
|
Token::Str("a"),
|
|
Token::I32(1),
|
|
|
|
Token::MapSep,
|
|
Token::Str("b"),
|
|
Token::I32(2),
|
|
|
|
Token::MapSep,
|
|
Token::Str("c"),
|
|
Token::I32(3),
|
|
Token::MapEnd,
|
|
],
|
|
NamedMap { a: 1, b: 2, c: 3 } => vec![
|
|
Token::Name("NamedMap"),
|
|
Token::MapStart(3),
|
|
Token::MapSep,
|
|
Token::Str("a"),
|
|
Token::I32(1),
|
|
|
|
Token::MapSep,
|
|
Token::Str("b"),
|
|
Token::I32(2),
|
|
|
|
Token::MapSep,
|
|
Token::Str("c"),
|
|
Token::I32(3),
|
|
Token::MapEnd,
|
|
],
|
|
}
|
|
test_enum_unit {
|
|
Enum::Unit => vec![
|
|
Token::EnumStart("Enum"),
|
|
Token::Str("Unit"),
|
|
Token::Unit,
|
|
Token::EnumEnd,
|
|
],
|
|
}
|
|
test_enum_seq {
|
|
Enum::Seq(1, 2, 3) => vec![
|
|
Token::EnumStart("Enum"),
|
|
Token::Str("Seq"),
|
|
Token::SeqStart(3),
|
|
Token::SeqSep,
|
|
Token::I32(1),
|
|
|
|
Token::SeqSep,
|
|
Token::I32(2),
|
|
|
|
Token::SeqSep,
|
|
Token::I32(3),
|
|
Token::SeqEnd,
|
|
Token::EnumEnd,
|
|
],
|
|
}
|
|
test_enum_map {
|
|
Enum::Map { a: 1, b: 2, c: 3 } => vec![
|
|
Token::EnumStart("Enum"),
|
|
Token::Str("Map"),
|
|
Token::MapStart(3),
|
|
Token::MapSep,
|
|
Token::Str("a"),
|
|
Token::I32(1),
|
|
|
|
Token::MapSep,
|
|
Token::Str("b"),
|
|
Token::I32(2),
|
|
|
|
Token::MapSep,
|
|
Token::Str("c"),
|
|
Token::I32(3),
|
|
Token::MapEnd,
|
|
Token::EnumEnd,
|
|
],
|
|
}
|
|
}
|