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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
use resource_files::resources_dir_path;
use rustc_serialize::json::{Json, ToJson};
use std::borrow::ToOwned;
use std::collections::HashMap;
use std::fs::File;
use std::sync::{Arc, Mutex};
lazy_static! {
static ref PREFS: Arc<Mutex<HashMap<String, Pref>>> = {
let prefs = read_prefs().unwrap_or(HashMap::new());
Arc::new(Mutex::new(prefs))
};
}
#[derive(PartialEq, Clone, Debug)]
pub enum PrefValue {
Boolean(bool),
String(String),
Missing
}
impl PrefValue {
pub fn from_json(data: Json) -> Result<PrefValue, ()> {
let value = match data {
Json::Boolean(x) => PrefValue::Boolean(x),
Json::String(x) => PrefValue::String(x),
_ => return Err(())
};
Ok(value)
}
pub fn as_boolean(&self) -> Option<bool> {
match *self {
PrefValue::Boolean(value) => {
Some(value)
},
_ => None
}
}
pub fn as_string(&self) -> Option<&str> {
match *self {
PrefValue::String(ref value) => {
Some(&value)
},
_ => None
}
}
}
impl ToJson for PrefValue {
fn to_json(&self) -> Json {
match *self {
PrefValue::Boolean(x) => {
Json::Boolean(x)
},
PrefValue::String(ref x) => {
Json::String(x.clone())
}
PrefValue::Missing => Json::Null
}
}
}
enum Pref {
NoDefault(Arc<PrefValue>),
WithDefault(Arc<PrefValue>, Option<Arc<PrefValue>>)
}
impl Pref {
pub fn new(value: PrefValue) -> Pref {
Pref::NoDefault(Arc::new(value))
}
fn new_default(value: PrefValue) -> Pref {
Pref::WithDefault(Arc::new(value), None)
}
fn from_json(data: Json) -> Result<Pref, ()> {
let value = try!(PrefValue::from_json(data));
Ok(Pref::new_default(value))
}
pub fn value(&self) -> &Arc<PrefValue> {
match *self {
Pref::NoDefault(ref x) => x,
Pref::WithDefault(ref default, ref override_value) => {
match *override_value {
Some(ref x) => x,
None => default
}
}
}
}
fn set(&mut self, value: PrefValue) {
// TODO - this should error if we try to override a pref of one type
// with a value of a different type
match *self {
Pref::NoDefault(ref mut pref_value) => {
*pref_value = Arc::new(value)
},
Pref::WithDefault(_, ref mut override_value) => {
*override_value = Some(Arc::new(value))
}
}
}
}
impl ToJson for Pref {
fn to_json(&self) -> Json {
self.value().to_json()
}
}
fn read_prefs() -> Result<HashMap<String, Pref>, ()> {
let mut path = resources_dir_path();
path.push("prefs.json");
let mut file = try!(File::open(path).or_else(|e| {
println!("Error opening preferences: {:?}.", e);
Err(())
}));
let json = try!(Json::from_reader(&mut file).or_else(|e| {
println!("Ignoring invalid JSON in preferences: {:?}.", e);
Err(())
}));
let mut prefs = HashMap::new();
if let Json::Object(obj) = json {
for (name, value) in obj.into_iter() {
match Pref::from_json(value) {
Ok(x) => {
prefs.insert(name, x);
},
Err(_) => println!("Ignoring non-boolean/string preference value for {:?}", name)
}
}
}
Ok(prefs)
}
pub fn get_pref(name: &str) -> Arc<PrefValue> {
PREFS.lock().unwrap().get(name).map_or(Arc::new(PrefValue::Missing), |x| x.value().clone())
}
pub fn set_pref(name: &str, value: PrefValue) {
let mut prefs = PREFS.lock().unwrap();
if let Some(pref) = prefs.get_mut(name) {
pref.set(value);
return;
}
prefs.insert(name.to_owned(), Pref::new(value));
}
pub fn reset_pref(name: &str) -> Arc<PrefValue> {
let mut prefs = PREFS.lock().unwrap();
let result = match prefs.get_mut(name) {
None => return Arc::new(PrefValue::Missing),
Some(&mut Pref::NoDefault(_)) => Arc::new(PrefValue::Missing),
Some(&mut Pref::WithDefault(ref default, ref mut set_value)) => {
*set_value = None;
default.clone()
},
};
if *result == PrefValue::Missing {
prefs.remove(name);
}
result
}
pub fn reset_all_prefs() {
let names = {
PREFS.lock().unwrap().keys().cloned().collect::<Vec<String>>()
};
for name in names.iter() {
reset_pref(name);
}
}
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