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|
use std::collections::HashMap;
use std::fmt::Display;
use error::*;
/// Underlying kind of the configuration value.
#[derive(Debug, Clone)]
pub enum ValueKind {
Nil,
Boolean(bool),
Integer(i64),
Float(f64),
String(String),
Table(Table),
Array(Array),
}
pub type Array = Vec<Value>;
pub type Table = HashMap<String, Value>;
impl Default for ValueKind {
fn default() -> Self {
ValueKind::Nil
}
}
impl<T> From<Option<T>> for ValueKind
where T: Into<ValueKind>
{
fn from(value: Option<T>) -> Self {
match value {
Some(value) => value.into(),
None => ValueKind::Nil,
}
}
}
impl From<String> for ValueKind {
fn from(value: String) -> Self {
ValueKind::String(value.into())
}
}
impl<'a> From<&'a str> for ValueKind {
fn from(value: &'a str) -> Self {
ValueKind::String(value.into())
}
}
impl From<i64> for ValueKind {
fn from(value: i64) -> Self {
ValueKind::Integer(value)
}
}
impl From<f64> for ValueKind {
fn from(value: f64) -> Self {
ValueKind::Float(value)
}
}
impl From<bool> for ValueKind {
fn from(value: bool) -> Self {
ValueKind::Boolean(value)
}
}
impl<T> From<HashMap<String, T>> for ValueKind
where T: Into<Value>
{
fn from(values: HashMap<String, T>) -> Self {
let mut r = HashMap::new();
for (k, v) in values {
r.insert(k.clone(), v.into());
}
ValueKind::Table(r)
}
}
impl<T> From<Vec<T>> for ValueKind
where T: Into<Value>
{
fn from(values: Vec<T>) -> Self {
let mut l = Vec::new();
for v in values {
l.push(v.into());
}
ValueKind::Array(l)
}
}
/// A configuration value.
#[derive(Default, Debug, Clone)]
pub struct Value {
/// A description of the original location of the value.
///
/// A Value originating from a File might contain:
/// ```
/// Settings.toml at line 1 column 2
/// ```
///
/// A Value originating from the environment would contain:
/// ```
/// the envrionment
/// ```
///
/// A Value originating from a remote source might contain:
/// ```
/// etcd+http://127.0.0.1:2379
/// ```
origin: Option<String>,
/// Underlying kind of the configuration value.
pub kind: ValueKind,
}
impl Value {
pub fn new<V>(origin: Option<&String>, kind: V) -> Self
where V: Into<ValueKind>
{
Value {
origin: origin.cloned(),
kind: kind.into(),
}
}
/// Returns `self` as a bool, if possible.
pub fn into_bool(self) -> Result<bool> {
match self.kind {
ValueKind::Boolean(value) => Ok(value),
ValueKind::Integer(value) => Ok(value != 0),
ValueKind::Float(value) => Ok(value != 0.0),
ValueKind::String(ref value) => {
match value.to_lowercase().as_ref() {
"1" | "true" | "on" | "yes" => Ok(true),
"0" | "false" | "off" | "no" => Ok(false),
// Unexpected string value
s @ _ => Err(ConfigError::invalid_type(self.origin.clone(), Unexpected::Str(s.into()), "a boolean")),
}
}
// Unexpected type
ValueKind::Nil => Err(ConfigError::invalid_type(self.origin.clone(), Unexpected::Unit, "a boolean")),
ValueKind::Table(_) => Err(ConfigError::invalid_type(self.origin.clone(), Unexpected::Map, "a boolean")),
ValueKind::Array(_) => Err(ConfigError::invalid_type(self.origin.clone(), Unexpected::Seq, "a boolean")),
}
}
/// Returns `self` into an i64, if possible.
pub fn into_int(self) -> Result<i64> {
match self.kind {
ValueKind::Integer(value) => Ok(value),
ValueKind::String(ref s) => s.parse().map_err(|_| {
// Unexpected string
ConfigError::invalid_type(self.origin.clone(), Unexpected::Str(s.clone()), "an integer")
}),
ValueKind::Boolean(value) => Ok(if value { 1 } else { 0 }),
ValueKind::Float(value) => Ok(value.round() as i64),
// Unexpected type
ValueKind::Nil => Err(ConfigError::invalid_type(self.origin.clone(), Unexpected::Unit, "an integer")),
ValueKind::Table(_) => Err(ConfigError::invalid_type(self.origin.clone(), Unexpected::Map, "an integer")),
ValueKind::Array(_) => Err(ConfigError::invalid_type(self.origin.clone(), Unexpected::Seq, "an integer")),
}
}
/// Returns `self` into a f64, if possible.
pub fn into_float(self) -> Result<f64> {
match self.kind {
ValueKind::Float(value) => Ok(value),
ValueKind::String(ref s) => s.parse().map_err(|_| {
// Unexpected string
ConfigError::invalid_type(self.origin.clone(), Unexpected::Str(s.clone()), "a floating point")
}),
ValueKind::Integer(value) => Ok(value as f64),
ValueKind::Boolean(value) => Ok(if value { 1.0 } else { 0.0 }),
// Unexpected type
ValueKind::Nil => Err(ConfigError::invalid_type(self.origin.clone(), Unexpected::Unit, "a floating point")),
ValueKind::Table(_) => Err(ConfigError::invalid_type(self.origin.clone(), Unexpected::Map, "a floating point")),
ValueKind::Array(_) => Err(ConfigError::invalid_type(self.origin.clone(), Unexpected::Seq, "a floating point")),
}
}
/// Returns `self` into a str, if possible.
pub fn into_str(self) -> Result<String> {
match self.kind {
ValueKind::String(value) => Ok(value),
// Cannot convert
ValueKind::Float(value) => Err(ConfigError::invalid_type(self.origin, Unexpected::Float(value), "a string")),
ValueKind::Integer(value) => Err(ConfigError::invalid_type(self.origin, Unexpected::Integer(value), "a string")),
ValueKind::Boolean(value) => Err(ConfigError::invalid_type(self.origin, Unexpected::Bool(value), "a string")),
ValueKind::Nil => Err(ConfigError::invalid_type(self.origin, Unexpected::Unit, "a string")),
ValueKind::Table(_) => Err(ConfigError::invalid_type(self.origin, Unexpected::Map, "a string")),
ValueKind::Array(_) => Err(ConfigError::invalid_type(self.origin, Unexpected::Seq, "a string")),
}
}
/// Returns `self` into an array, if possible
pub fn into_array(self) -> Result<Vec<Value>> {
match self.kind {
ValueKind::Array(value) => Ok(value),
// Cannot convert
ValueKind::Float(value) => Err(ConfigError::invalid_type(self.origin, Unexpected::Float(value), "an array")),
ValueKind::String(value) => Err(ConfigError::invalid_type(self.origin, Unexpected::Str(value), "an array")),
ValueKind::Integer(value) => Err(ConfigError::invalid_type(self.origin, Unexpected::Integer(value), "an array")),
ValueKind::Boolean(value) => Err(ConfigError::invalid_type(self.origin, Unexpected::Bool(value), "an array")),
ValueKind::Nil => Err(ConfigError::invalid_type(self.origin, Unexpected::Unit, "an array")),
ValueKind::Table(_) => Err(ConfigError::invalid_type(self.origin, Unexpected::Map, "an array")),
}
}
/// If the `Value` is a Table, returns the associated Map.
pub fn into_table
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