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use std::borrow::Cow;
use std::collections::HashMap;
use std::collections::hash_map::{Entry, Iter};
use std::iter::FromIterator;
use std::fmt;
use std::mem;
use std::path::Path;
use std::io::Read;
use std::fs::File;
use unicase::UniCase;
use rustc_serialize::json::Json;
use field::{Field, FieldRef, FieldMut, RawValue};
use item::ConfigItem;
use result::Result;
use error::Error;
use cowstr::CowStr;
type Key = UniCase<CowStr>;
#[inline]
fn key<T: Field>() -> &'static str { <T as Field>::key() }
pub struct Config {
data: HashMap<Key, ConfigItem>,
}
impl Default for Config {
fn default() -> Self { Config::new() }
}
impl Config {
pub fn new() -> Self { Config { data: HashMap::new() } }
#[doc(hidden)]
pub fn from_raw_pairs(raw: &[(&str, RawValue)]) -> Result<Self> {
let mut config = Config::new();
for kv in raw {
trace!("raw value: {}={}", kv.0, kv.1);
let key = UniCase(CowStr::new(Cow::Owned(kv.0.to_owned())));
match config.data.entry(key) {
Entry::Vacant(entry) => entry.insert(ConfigItem::new_raw(kv.1.clone())),
Entry::Occupied(_) => return Err(Error::DuplicateKeys),
};
}
Ok(config)
}
pub fn from_str<'a>(s: &'a str) -> Result<Self> {
match try!(Json::from_str(s)) {
Json::Object(ref obj) => {
let mut config = Config::new();
for kv in obj {
trace!("raw value: {}={}", kv.0, kv.1);
let key = UniCase(CowStr::new(Cow::Owned(kv.0.to_owned())));
match config.data.entry(key) {
Entry::Vacant(entry) => entry.insert(ConfigItem::new_raw(kv.1.clone())),
Entry::Occupied(_) => return Err(Error::DuplicateKeys),
};
}
Ok(config)
}
_ => Err(Error::ExpectedJsonObject),
}
}
pub fn load<P: AsRef<Path>>(path: P) -> Result<Self> {
let mut f = try!(File::open(path));
let mut j = String::new();
f.read_to_string(&mut j).unwrap();
let config = try!(Config::from_str(j.as_ref()));
Ok(config)
}
pub fn set<V: Field>(&mut self, value: V) {
trace!("Config.set({}, {})", key::<V>(), &value);
self.data.insert(UniCase(CowStr::new(Cow::Borrowed(key::<V>()))), ConfigItem::new_typed(value));
}
pub fn get_raw(&self, name: &str) -> Option<RawValue> {
self.data
.get(&UniCase(CowStr::new(Cow::Borrowed(unsafe { mem::transmute::<&str, &str>(name) }))))
.map(ConfigItem::raw)
}
pub fn set_raw<K: Into<Cow<'static, str>>>(&mut self, name: K, value: RawValue) {
let name = name.into();
trace!("Config.set_raw({}, {:?})", name, value);
self.data.insert(UniCase(CowStr::new(name)), ConfigItem::new_raw(value));
}
pub fn remove_raw(&mut self, name: &str) {
trace!("Config.remove_raw({})", name);
self.data.remove(&UniCase(CowStr::new(Cow::Borrowed(unsafe { mem::transmute::<&str, &str>(name) }))));
}
pub fn get<V: Field>(&self) -> Option<&V> {
self.data
.get(&UniCase(CowStr::new(Cow::Borrowed(key::<V>()))))
.and_then(ConfigItem::typed::<V>)
}
pub fn get_mut<V: Field>(&mut self) -> Option<&mut V> {
self.data
.get_mut(&UniCase(CowStr::new(Cow::Borrowed(key::<V>()))))
.and_then(ConfigItem::typed_mut::<V>)
}
pub fn has<V: Field>(&self) -> bool {
self.data.contains_key(&UniCase(CowStr::new(Cow::Borrowed(key::<V>()))))
}
pub fn remove<V: Field>(&mut self) -> bool {
trace!("Config.remove({})", key::<V>());
self.data.remove(&UniCase(CowStr::new(Cow::Borrowed(key::<V>())))).is_some()
}
pub fn iter(&self) -> ConfigItems { ConfigItems { inner: self.data.iter() } }
pub fn len(&self) -> usize { self.data.len() }
pub fn clear(&mut self) { self.data.clear() }
}
impl FieldRef for Config {
fn get<V: Field>(&self) -> Option<&V> { Config::get::<V>(self) }
fn get_raw(&self, name: &str) -> Option<RawValue> { Config::get_raw(self, name) }
}
impl FieldMut for Config {
fn set<V: Field>(&mut self, value: V) { Config::set(self, value) }
fn set_raw<K>(&mut self, name: K, value: RawValue)
where K: Into<Cow<'static, str>>
{
Config::set_raw(self, name, value)
}
}
pub struct ConfigItems<'a> {
inner: Iter<'a, Key, ConfigItem>,
}
impl<'a> Iterator for ConfigItems<'a> {
type Item = FieldView<'a>;
fn next(&mut self) -> Option<FieldView<'a>> { self.inner.next().map(|(k, v)| FieldView(k, v)) }
}
pub struct FieldView<'a>(&'a Key, &'a ConfigItem);
impl<'a> FieldView<'a> {
#[inline]
pub fn is<V: Field>(&self) -> bool { UniCase(CowStr::new(Cow::Borrowed(key::<V>()))) == *self.0 }
#[inline]
pub fn key(&self) -> &'a str { self.0.as_ref() }
#[inline]
pub fn value<V: Field>(&self) -> Option<&'a V> { self.1.typed::<V>() }
#[inline]
pub fn value_string(&self) -> String { (*self.1).to_string() }
}
impl<'a> fmt::Display for FieldView<'a> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { write!(f, "{}: {}", self.0, *self.1) }
}
impl<'a> fmt::Debug for FieldView<'a> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { fmt::Display::fmt(self, f) }
}
impl<'a> Extend<FieldView<'a>> for Config {
fn extend<I: IntoIterator<Item = FieldView<'a>>>(&mut self, iter: I) {
for kv in iter {
self.data.insert((*kv.0).clone(), (*kv.1).clone());
}
}
}
impl<'a> FromIterator<FieldView<'a>> for Config {
fn from_iter<I: IntoIterator<Item = FieldView<'a>>>(iter: I) -> Config {
let mut config = Config::new();
config.extend(iter);
config
}
}