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use crate::{NamedField, UnnamedField};
use bevy_utils::HashMap;
use std::slice::Iter;
#[derive(Debug, Copy, Clone, Eq, PartialEq, Hash)]
pub enum VariantType {
Struct,
Tuple,
Unit,
}
#[derive(Clone, Debug)]
pub enum VariantInfo {
Struct(StructVariantInfo),
Tuple(TupleVariantInfo),
Unit(UnitVariantInfo),
}
impl VariantInfo {
pub fn name(&self) -> &'static str {
match self {
Self::Struct(info) => info.name(),
Self::Tuple(info) => info.name(),
Self::Unit(info) => info.name(),
}
}
#[cfg(feature = "documentation")]
pub fn docs(&self) -> Option<&str> {
match self {
Self::Struct(info) => info.docs(),
Self::Tuple(info) => info.docs(),
Self::Unit(info) => info.docs(),
}
}
}
#[derive(Clone, Debug)]
pub struct StructVariantInfo {
name: &'static str,
fields: Box<[NamedField]>,
field_names: Box<[&'static str]>,
field_indices: HashMap<&'static str, usize>,
#[cfg(feature = "documentation")]
docs: Option<&'static str>,
}
impl StructVariantInfo {
pub fn new(name: &'static str, fields: &[NamedField]) -> Self {
let field_indices = Self::collect_field_indices(fields);
let field_names = fields.iter().map(|field| field.name()).collect();
Self {
name,
fields: fields.to_vec().into_boxed_slice(),
field_names,
field_indices,
#[cfg(feature = "documentation")]
docs: None,
}
}
#[cfg(feature = "documentation")]
pub fn with_docs(self, docs: Option<&'static str>) -> Self {
Self { docs, ..self }
}
pub fn name(&self) -> &'static str {
self.name
}
pub fn field_names(&self) -> &[&'static str] {
&self.field_names
}
pub fn field(&self, name: &str) -> Option<&NamedField> {
self.field_indices
.get(name)
.map(|index| &self.fields[*index])
}
pub fn field_at(&self, index: usize) -> Option<&NamedField> {
self.fields.get(index)
}
pub fn index_of(&self, name: &str) -> Option<usize> {
self.field_indices.get(name).copied()
}
pub fn iter(&self) -> Iter<'_, NamedField> {
self.fields.iter()
}
pub fn field_len(&self) -> usize {
self.fields.len()
}
fn collect_field_indices(fields: &[NamedField]) -> HashMap<&'static str, usize> {
fields
.iter()
.enumerate()
.map(|(index, field)| (field.name(), index))
.collect()
}
#[cfg(feature = "documentation")]
pub fn docs(&self) -> Option<&'static str> {
self.docs
}
}
#[derive(Clone, Debug)]
pub struct TupleVariantInfo {
name: &'static str,
fields: Box<[UnnamedField]>,
#[cfg(feature = "documentation")]
docs: Option<&'static str>,
}
impl TupleVariantInfo {
pub fn new(name: &'static str, fields: &[UnnamedField]) -> Self {
Self {
name,
fields: fields.to_vec().into_boxed_slice(),
#[cfg(feature = "documentation")]
docs: None,
}
}
#[cfg(feature = "documentation")]
pub fn with_docs(self, docs: Option<&'static str>) -> Self {
Self { docs, ..self }
}
pub fn name(&self) -> &'static str {
self.name
}
pub fn field_at(&self, index: usize) -> Option<&UnnamedField> {
self.fields.get(index)
}
pub fn iter(&self) -> Iter<'_, UnnamedField> {
self.fields.iter()
}
pub fn field_len(&self) -> usize {
self.fields.len()
}
#[cfg(feature = "documentation")]
pub fn docs(&self) -> Option<&'static str> {
self.docs
}
}
#[derive(Clone, Debug)]
pub struct UnitVariantInfo {
name: &'static str,
#[cfg(feature = "documentation")]
docs: Option<&'static str>,
}
impl UnitVariantInfo {
pub fn new(name: &'static str) -> Self {
Self {
name,
#[cfg(feature = "documentation")]
docs: None,
}
}
#[cfg(feature = "documentation")]
pub fn with_docs(self, docs: Option<&'static str>) -> Self {
Self { docs, ..self }
}
pub fn name(&self) -> &'static str {
self.name
}
#[cfg(feature = "documentation")]
pub fn docs(&self) -> Option<&'static str> {
self.docs
}
}