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use std::{io, fmt};
use std::collections::HashMap;
use std::collections::hash_map::Values;
use serde::{Deserialize, Deserializer};
use serde::de::{Visitor, SeqAccess};
use serde_json;
use operation::Operation;
use {errors, ErrorKind, Event, Constructor, Function};
#[derive(Clone, Debug, PartialEq)]
pub struct Contract {
pub constructor: Option<Constructor>,
pub functions: HashMap<String, Function>,
pub events: HashMap<String, Event>,
pub fallback: bool,
}
impl<'a> Deserialize<'a> for Contract {
fn deserialize<D>(deserializer: D) -> Result<Contract, D::Error> where D: Deserializer<'a> {
deserializer.deserialize_any(ContractVisitor)
}
}
struct ContractVisitor;
impl<'a> Visitor<'a> for ContractVisitor {
type Value = Contract;
fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
formatter.write_str("valid abi spec file")
}
fn visit_seq<A>(self, mut seq: A) -> Result<Self::Value, A::Error> where A: SeqAccess<'a> {
let mut result = Contract {
constructor: None,
functions: HashMap::default(),
events: HashMap::default(),
fallback: false,
};
while let Some(operation) = seq.next_element()? {
match operation {
Operation::Constructor(constructor) => {
result.constructor = Some(constructor);
},
Operation::Function(func) => {
result.functions.insert(func.name.clone(), func);
},
Operation::Event(event) => {
result.events.insert(event.name.clone(), event);
},
Operation::Fallback => {
result.fallback = true;
},
}
}
Ok(result)
}
}
impl Contract {
pub fn load<T: io::Read>(reader: T) -> errors::Result<Self> {
serde_json::from_reader(reader).map_err(From::from)
}
pub fn constructor(&self) -> Option<&Constructor> {
self.constructor.as_ref()
}
pub fn function(&self, name: &str) -> errors::Result<&Function> {
self.functions.get(name).ok_or_else(|| ErrorKind::InvalidName(name.to_owned()).into())
}
pub fn event(&self, name: &str) -> errors::Result<&Event> {
self.events.get(name).ok_or_else(|| ErrorKind::InvalidName(name.to_owned()).into())
}
pub fn functions(&self) -> Functions {
Functions(self.functions.values())
}
pub fn events(&self) -> Events {
Events(self.events.values())
}
pub fn fallback(&self) -> bool {
self.fallback
}
}
pub struct Functions<'a>(Values<'a, String, Function>);
impl<'a> Iterator for Functions<'a> {
type Item = &'a Function;
fn next(&mut self) -> Option<Self::Item> {
self.0.next()
}
}
pub struct Events<'a>(Values<'a, String, Event>);
impl<'a> Iterator for Events<'a> {
type Item = &'a Event;
fn next(&mut self) -> Option<Self::Item> {
self.0.next()
}
}