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use std::fmt;
use crate::model::KStringCow;
use crate::model::value::DisplayCow;
use crate::model::State;
use crate::model::Value;
use crate::model::ValueView;
pub trait ArrayView: ValueView {
fn as_value(&self) -> &dyn ValueView;
fn size(&self) -> i64;
fn values<'k>(&'k self) -> Box<dyn Iterator<Item = &'k dyn ValueView> + 'k>;
fn contains_key(&self, index: i64) -> bool;
fn get(&self, index: i64) -> Option<&dyn ValueView>;
fn first(&self) -> Option<&dyn ValueView> {
self.get(0)
}
fn last(&self) -> Option<&dyn ValueView> {
self.get(-1)
}
}
pub type Array = Vec<Value>;
impl<T: ValueView> ValueView for Vec<T> {
fn as_debug(&self) -> &dyn fmt::Debug {
self
}
fn render(&self) -> DisplayCow<'_> {
DisplayCow::Owned(Box::new(ArrayRender { s: self }))
}
fn source(&self) -> DisplayCow<'_> {
DisplayCow::Owned(Box::new(ArraySource { s: self }))
}
fn type_name(&self) -> &'static str {
"array"
}
fn query_state(&self, state: State) -> bool {
match state {
State::Truthy => true,
State::DefaultValue | State::Empty | State::Blank => self.is_empty(),
}
}
fn to_kstr(&self) -> KStringCow<'_> {
let s = ArrayRender { s: self }.to_string();
KStringCow::from_string(s)
}
fn to_value(&self) -> Value {
let a = self.iter().map(|v| v.to_value()).collect();
Value::Array(a)
}
fn as_array(&self) -> Option<&dyn ArrayView> {
Some(self)
}
}
impl<T: ValueView> ArrayView for Vec<T> {
fn as_value(&self) -> &dyn ValueView {
self
}
fn size(&self) -> i64 {
self.len() as i64
}
fn values<'k>(&'k self) -> Box<dyn Iterator<Item = &'k dyn ValueView> + 'k> {
let i = self.as_slice().iter().map(|v| convert_value(v));
Box::new(i)
}
fn contains_key(&self, index: i64) -> bool {
let index = convert_index(index, self.size());
index < self.size()
}
fn get(&self, index: i64) -> Option<&dyn ValueView> {
let index = convert_index(index, self.size());
let value = self.as_slice().get(index as usize);
value.map(|v| convert_value(v))
}
}
impl<'a, A: ArrayView + ?Sized> ArrayView for &'a A {
fn as_value(&self) -> &dyn ValueView {
<A as ArrayView>::as_value(self)
}
fn size(&self) -> i64 {
<A as ArrayView>::size(self)
}
fn values<'k>(&'k self) -> Box<dyn Iterator<Item = &'k dyn ValueView> + 'k> {
<A as ArrayView>::values(self)
}
fn contains_key(&self, index: i64) -> bool {
<A as ArrayView>::contains_key(self, index)
}
fn get(&self, index: i64) -> Option<&dyn ValueView> {
<A as ArrayView>::get(self, index)
}
}
fn convert_value(s: &dyn ValueView) -> &dyn ValueView {
s
}
fn convert_index(index: i64, max_size: i64) -> i64 {
if 0 <= index {
index
} else {
max_size + index
}
}
struct ArraySource<'s, T: ValueView> {
s: &'s Vec<T>,
}
impl<'s, T: ValueView> fmt::Display for ArraySource<'s, T> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "[")?;
for item in self.s {
write!(f, "{}, ", item.render())?;
}
write!(f, "]")?;
Ok(())
}
}
struct ArrayRender<'s, T: ValueView> {
s: &'s Vec<T>,
}
impl<'s, T: ValueView> fmt::Display for ArrayRender<'s, T> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
for item in self.s {
write!(f, "{}", item.render())?;
}
Ok(())
}
}
#[cfg(test)]
mod test {
use super::*;
#[test]
fn test_array() {
let arr = Array::new();
println!("{}", arr.source());
let array: &dyn ArrayView = &arr;
println!("{}", array.source());
let view: &dyn ValueView = array.as_value();
println!("{}", view.source());
}
}