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use crate::{Mapping, Value};
// Implement a bunch of conversion to make it easier to create YAML values
// on the fly.
macro_rules! from_number {
($($ty:ident)*) => {
$(
impl From<$ty> for Value {
fn from(n: $ty) -> Self {
Value::Number(n.into())
}
}
)*
};
}
from_number! {
i8 i16 i32 i64 isize
u8 u16 u32 u64 usize
f32 f64
}
impl From<bool> for Value {
/// Convert boolean to `Value`
///
/// # Examples
///
/// ```
/// use serde_yaml::Value;
///
/// let b = false;
/// let x: Value = b.into();
/// ```
fn from(f: bool) -> Self {
Value::Bool(f)
}
}
impl From<String> for Value {
/// Convert `String` to `Value`
///
/// # Examples
///
/// ```
/// use serde_yaml::Value;
///
/// let s: String = "lorem".to_string();
/// let x: Value = s.into();
/// ```
fn from(f: String) -> Self {
Value::String(f)
}
}
impl<'a> From<&'a str> for Value {
/// Convert string slice to `Value`
///
/// # Examples
///
/// ```
/// use serde_yaml::Value;
///
/// let s: &str = "lorem";
/// let x: Value = s.into();
/// ```
fn from(f: &str) -> Self {
Value::String(f.to_string())
}
}
use std::borrow::Cow;
impl<'a> From<Cow<'a, str>> for Value {
/// Convert copy-on-write string to `Value`
///
/// # Examples
///
/// ```
/// use serde_yaml::Value;
/// use std::borrow::Cow;
///
/// let s: Cow<str> = Cow::Borrowed("lorem");
/// let x: Value = s.into();
/// ```
///
/// ```
/// use serde_yaml::Value;
/// use std::borrow::Cow;
///
/// let s: Cow<str> = Cow::Owned("lorem".to_string());
/// let x: Value = s.into();
/// ```
fn from(f: Cow<'a, str>) -> Self {
Value::String(f.to_string())
}
}
impl From<Mapping> for Value {
/// Convert map (with string keys) to `Value`
///
/// # Examples
///
/// ```
/// use serde_yaml::{Mapping, Value};
///
/// let mut m = Mapping::new();
/// m.insert("Lorem".into(), "ipsum".into());
/// let x: Value = m.into();
/// ```
fn from(f: Mapping) -> Self {
Value::Mapping(f)
}
}
impl<T: Into<Value>> From<Vec<T>> for Value {
/// Convert a `Vec` to `Value`
///
/// # Examples
///
/// ```
/// use serde_yaml::Value;
///
/// let v = vec!["lorem", "ipsum", "dolor"];
/// let x: Value = v.into();
/// ```
fn from(f: Vec<T>) -> Self {
Value::Sequence(f.into_iter().map(Into::into).collect())
}
}
impl<'a, T: Clone + Into<Value>> From<&'a [T]> for Value {
/// Convert a slice to `Value`
///
/// # Examples
///
/// ```
/// use serde_yaml::Value;
///
/// let v: &[&str] = &["lorem", "ipsum", "dolor"];
/// let x: Value = v.into();
/// ```
fn from(f: &'a [T]) -> Self {
Value::Sequence(f.iter().cloned().map(Into::into).collect())
}
}
use std::iter::FromIterator;
impl<T: Into<Value>> FromIterator<T> for Value {
/// Convert an iteratable type to a YAML sequence
///
/// # Examples
///
/// ```
/// use serde_yaml::Value;
///
/// let v = std::iter::repeat(42).take(5);
/// let x: Value = v.collect();
/// ```
///
/// ```
/// use serde_yaml::Value;
///
/// let v: Vec<_> = vec!["lorem", "ipsum", "dolor"];
/// let x: Value = v.into_iter().collect();
/// ```
///
/// ```
/// use std::iter::FromIterator;
/// use serde_yaml::Value;
///
/// let x: Value = Value::from_iter(vec!["lorem", "ipsum", "dolor"]);
/// ```
fn from_iter<I: IntoIterator<Item = T>>(iter: I) -> Self {
let vec = iter.into_iter().map(T::into).collect();
Value::Sequence(vec)
}
}