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use {
core::{
convert::TryFrom,
iter::FromIterator,
},
crate::{Array, Error, Result, Value},
};
macro_rules! at_or_mut_at { ($self: ident, $indexes: ident, $code: tt) => {{
let mut value = Some($self);
for (nth, idx) in $indexes.iter().enumerate() {
match value {
Some(Value::Array(array)) => {
value = array.$code(*idx);
if nth + 1 == $indexes.len() {
return value.ok_or_else(|| err!("Indexes are invalid: {:?}", $indexes));
}
},
Some(_) => return Err(Error::from(match nth {
0 => err!("Value is not an Array"),
_ => err!("Value at {:?} is not an Array", &$indexes[..nth]),
})),
None => return Err(err!("There is no value at {:?}", &$indexes[..nth])),
};
}
Err(err!("Indexes must not be empty"))
}}}
impl Value {
pub fn push<T>(&mut self, value: T) -> Result<()> where T: Into<Self> {
match self {
Value::Array(array) => Ok(crate::push(array, value)),
_ => Err(err!("Value is not an Array")),
}
}
pub fn at(&self, indexes: &[usize]) -> Result<&Self> {
at_or_mut_at!(self, indexes, get)
}
pub fn mut_at(&mut self, indexes: &[usize]) -> Result<&mut Self> {
at_or_mut_at!(self, indexes, get_mut)
}
pub fn take_at(&mut self, indexes: &[usize]) -> Result<Self> {
let mut value = Some(self);
for (nth, idx) in indexes.iter().enumerate() {
match value {
Some(Value::Array(array)) => match nth + 1 == indexes.len() {
true => return match idx >= &0 && idx < &array.len() {
true => Ok(array.remove(*idx)),
false => Err(err!("Invalid indexes: {:?}", indexes)),
},
false => value = array.get_mut(*idx),
},
Some(_) => return Err(Error::from(match nth {
0 => err!("Value is not an Array"),
_ => err!("Value at {:?} is not an Array", &indexes[..nth]),
})),
None => return Err(err!("There is no value at {:?}", &indexes[..nth])),
};
}
Err(err!("Indexes must not be empty"))
}
pub fn as_array(&self) -> Result<&Array> {
match self {
Value::Array(array) => Ok(array),
_ => Err(err!("Value is not an Array")),
}
}
pub fn as_mut_array(&mut self) -> Result<&mut Array> {
match self {
Value::Array(array) => Ok(array),
_ => Err(err!("Value is not an Array")),
}
}
}
impl From<Array> for Value {
fn from(values: Array) -> Self {
Value::Array(values)
}
}
impl FromIterator<Value> for Value {
fn from_iter<T>(iter: T) -> Self where T: IntoIterator<Item=Self> {
Value::Array(iter.into_iter().collect())
}
}
impl TryFrom<Value> for Array {
type Error = Error;
fn try_from(value: Value) -> core::result::Result<Self, Self::Error> {
match value {
Value::Array(array) => Ok(array),
_ => Err(err!("Value is not an Array")),
}
}
}