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#![cfg_attr(not(feature = "std"), no_std)]
extern crate alloc;
#[cfg(not(feature = "std"))]
use alloc::collections::BTreeMap as Map;
use alloc::sync::Arc;
#[cfg(feature = "std")]
use std::collections::HashMap as Map;
/// File and line information
#[derive(Clone, Debug)]
pub struct Location {
file: Arc<str>,
line: u64,
}
impl core::fmt::Display for Location {
fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
write!(f, "{}:{}", self.file, self.line)
}
}
/// A string value, together with location information about where it is defined.
#[derive(Clone, Debug)]
struct Value {
value: Box<str>,
defined_at: Location,
}
#[derive(Clone, Debug, Default)]
pub struct Configuration {
// wrap in an Arc for cheap cloning
children: Arc<Map<Box<str>, Configuration>>,
values: Arc<Map<Box<str>, Value>>,
}
#[non_exhaustive]
pub enum Error {
#[cfg(feature = "std")]
IO(std::io::Error),
BadInt(Location, Box<str>),
BadUInt(Location, Box<str>),
BadFloat(Location, Box<str>),
BadBool(Location, Box<str>),
}
#[cfg(feature = "std")]
impl From<std::io::Error> for Error {
fn from(value: std::io::Error) -> Self {
Self::IO(value)
}
}
pub type Result<T> = std::result::Result<T, Error>;
fn parse_int(location: &Location, string: &str) -> Result<i64> {
let bad_int = || Error::BadInt(location.clone(), string.into());
if !string
.bytes()
.all(|c| c.is_ascii_hexdigit() || c == b'x' || c == b'X' || c == b'-' || c == b'+')
{
return Err(bad_int());
}
let signless = string.strip_prefix(['-', '+']).unwrap_or(string);
let mut base = 10;
let baseless = signless
.strip_prefix("0x")
.or_else(|| signless.strip_prefix("0X"))
.unwrap_or_else(|| {
base = 16;
signless
});
for digit in baseless.bytes() {
if base == 10 && !digit.is_ascii_digit() {
return Err(bad_int());
}
}
string.parse().map_err(|_| bad_int())
}
fn parse_uint(location: &Location, string: &str) -> Result<u64> {
let bad_uint = || Error::BadUInt(location.clone(), string.into());
if !string
.bytes()
.all(|c| c.is_ascii_hexdigit() || c == b'x' || c == b'X' || c == b'+')
{
return Err(bad_uint());
}
let signless = string.strip_prefix('+').unwrap_or(string);
let mut base = 10;
let baseless = signless
.strip_prefix("0x")
.or_else(|| signless.strip_prefix("0X"))
.unwrap_or_else(|| {
base = 16;
signless
});
for digit in baseless.bytes() {
if base == 10 && !digit.is_ascii_digit() {
return Err(bad_uint());
}
}
let val = signless.parse().map_err(|_| bad_uint())?;
if val > i64::MAX as u64 {
return Err(bad_uint());
}
Ok(val)
}
fn parse_float(location: &Location, string: &str) -> Result<f64> {
let bad_float = || Error::BadFloat(location.clone(), string.into());
if !string.bytes().all(|c| {
c.is_ascii_digit() || c == b'.' || c == b'+' || c == b'-' || c == b'e' || c == b'E'
}) {
return Err(bad_float());
}
string.parse().map_err(|_| bad_float())
}
fn parse_bool(location: &Location, string: &str) -> Result<bool> {
match string {
"yes" | "on" | "true" => Ok(true),
"no" | "off" | "false" => Ok(false),
_ => Err(Error::BadBool(location.clone(), string.into())),
}
}
fn parse_list(_location: &Location, _string: &str) -> Vec<String> {
todo!()
}
impl Configuration {
#[cfg(feature = "std")]
pub fn load<R: std::io::BufRead>(_reader: R) -> Result<Configuration> {
todo!()
}
pub fn load_str(_s: &str) -> Result<Configuration> {
todo!()
}
pub fn section(&self, key: &str) -> Configuration {
let mut node = self;
for component in key.split('.') {
node = match self.children.get(component) {
Some(x) => x,
None => return Configuration::default(),
};
}
node.clone()
}
fn get_val(&self, key: &str) -> Option<&Value> {
let Some(last_dot) = key.rfind('.') else {
return self.values.get(key);
};
let (path, last_component) = key.split_at(last_dot);
let mut node = self;
for component in path.split('.') {
node = self.children.get(component)?;
}
node.values.get(last_component)
}
pub fn get(&self, key: &str) -> Option<&str> {
Some(self.get_val(key)?.value.as_ref())
}
pub fn location(&self, key: &str) -> Option<Location> {
Some(self.get_val(key)?.defined_at.clone())
}
pub fn has(&self, key: &str) -> bool {
self.get(key).is_some()
}
pub fn get_or_default<'a>(&'a self, key: &str, default: &'a str) -> &'a str {
self.get(key).unwrap_or(default)
}
pub fn get_int(&self, key: &str) -> Option<Result<i64>> {
let Value { value, defined_at } = self.get_val(key)?;
Some(parse_int(defined_at, value.as_ref()))
}
pub fn get_int_or_default(&self, key: &str, default: i64) -> Result<i64> {
self.get_int(key).unwrap_or(Ok(default))
}
pub fn get_uint(&self, key: &str) -> Option<Result<u64>> {
let Value { value, defined_at } = self.get_val(key)?;
Some(parse_uint(defined_at, value.as_ref()))
}
pub fn get_uint_or_default(&self, key: &str, default: u64) -> Result<u64> {
self.get_uint(key).unwrap_or(Ok(default))
}
pub fn get_float(&self, key: &str) -> Option<Result<f64>> {
let Value { value, defined_at } = self.get_val(key)?;
Some(parse_float(defined_at, value.as_ref()))
}
pub fn get_float_or_default(&self, key: &str, default: f64) -> Result<f64> {
self.get_float(key).unwrap_or(Ok(default))
}
pub fn get_bool(&self, key: &str) -> Option<Result<bool>> {
let Value { value, defined_at } = self.get_val(key)?;
Some(parse_bool(defined_at, value.as_ref()))
}
pub fn get_bool_or_default(&self, key: &str, default: bool) -> Result<bool> {
self.get_bool(key).unwrap_or(Ok(default))
}
pub fn get_list(&self, key: &str) -> Option<Vec<String>> {
let Value { value, defined_at } = self.get_val(key)?;
Some(parse_list(defined_at, value.as_ref()))
}
pub fn get_list_or_default(
&self,
key: &str,
default: impl FnOnce() -> Vec<String>,
) -> Vec<String> {
self.get_list(key).unwrap_or_else(default)
}
/// Merge `conf` into `self`, preferring values in `conf`.
pub fn merge(&mut self, conf: &Configuration) {
let new_values = Arc::make_mut(&mut self.values);
// merge conf.values into self.values
for (key, val) in conf.values.iter() {
new_values.insert(key.clone(), val.clone());
}
// merge conf.children into self.children
let new_children = Arc::make_mut(&mut self.children);
for (key, child) in conf.children.iter() {
new_children.entry(key.clone()).or_default().merge(child)
}
}
}
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