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use crate::{build::Arg, util::Id, INTERNAL_ERROR_MSG};
use std::{ffi::OsStr, ffi::OsString, iter::Iterator, ops::Index};
#[derive(PartialEq, Eq, Debug, Clone)]
pub(crate) struct Key {
key: KeyType,
index: usize,
}
#[derive(Default, PartialEq, Eq, Debug, Clone)]
pub(crate) struct MKeyMap<'help> {
/// All of the arguments.
args: Vec<Arg<'help>>,
// Cache part:
/// Will be set after `_build()`.
keys: Vec<Key>,
}
#[derive(Debug, PartialEq, Eq, Hash, Clone)]
pub(crate) enum KeyType {
Short(char),
Long(OsString),
Position(usize),
}
impl KeyType {
pub(crate) fn is_position(&self) -> bool {
matches!(self, KeyType::Position(_))
}
}
impl PartialEq<usize> for KeyType {
fn eq(&self, rhs: &usize) -> bool {
match self {
KeyType::Position(x) => x == rhs,
_ => false,
}
}
}
impl PartialEq<&str> for KeyType {
fn eq(&self, rhs: &&str) -> bool {
match self {
KeyType::Long(l) => l == rhs,
_ => false,
}
}
}
impl PartialEq<str> for KeyType {
fn eq(&self, rhs: &str) -> bool {
match self {
KeyType::Long(l) => l == rhs,
_ => false,
}
}
}
impl PartialEq<OsStr> for KeyType {
fn eq(&self, rhs: &OsStr) -> bool {
match self {
KeyType::Long(l) => l == rhs,
_ => false,
}
}
}
impl PartialEq<char> for KeyType {
fn eq(&self, rhs: &char) -> bool {
match self {
KeyType::Short(c) => c == rhs,
_ => false,
}
}
}
impl<'help> MKeyMap<'help> {
/// If any arg has corresponding key in this map, we can search the key with
/// u64(for positional argument), char(for short flag), &str and OsString
/// (for long flag)
pub(crate) fn contains<K>(&self, key: K) -> bool
where
KeyType: PartialEq<K>,
{
self.keys.iter().any(|x| x.key == key)
}
/// Reserves capacity for at least additional more elements to be inserted
pub(crate) fn reserve(&mut self, additional: usize) {
self.args.reserve(additional);
}
/// Push an argument in the map.
pub(crate) fn push(&mut self, new_arg: Arg<'help>) {
self.args.push(new_arg);
}
/// Find the arg have corresponding key in this map, we can search the key
/// with u64(for positional argument), char(for short flag), &str and
/// OsString (for long flag)
pub(crate) fn get<K: ?Sized>(&self, key: &K) -> Option<&Arg<'help>>
where
KeyType: PartialEq<K>,
{
self.keys
.iter()
.find(|k| &k.key == key)
.map(|k| &self.args[k.index])
}
/// Find out if the map have no arg.
pub(crate) fn is_empty(&self) -> bool {
self.args.is_empty()
}
/// Return iterators of all keys.
pub(crate) fn keys(&self) -> impl Iterator<Item = &KeyType> {
self.keys.iter().map(|x| &x.key)
}
/// Return iterators of all args.
pub(crate) fn args(&self) -> impl Iterator<Item = &Arg<'help>> {
self.args.iter()
}
/// Return mutable iterators of all args.
pub(crate) fn args_mut<'map>(&'map mut self) -> impl Iterator<Item = &'map mut Arg<'help>> {
self.args.iter_mut()
}
/// We need a lazy build here since some we may change args after creating
/// the map, you can checkout who uses `args_mut`.
pub(crate) fn _build(&mut self) {
for (i, arg) in self.args.iter().enumerate() {
append_keys(&mut self.keys, arg, i);
}
}
/// Remove an arg in the graph by Id, usually used by `mut_arg`. Return
/// `Some(arg)` if removed.
pub(crate) fn remove_by_name(&mut self, name: &Id) -> Option<Arg<'help>> {
self.args
.iter()
.position(|arg| &arg.id == name)
// since it's a cold function, using this wouldn't hurt much
.map(|i| self.args.remove(i))
}
/// Remove an arg based on index
pub(crate) fn remove(&mut self, index: usize) -> Arg<'help> {
self.args.remove(index)
}
}
impl<'help> Index<&'_ KeyType> for MKeyMap<'help> {
type Output = Arg<'help>;
fn index(&self, key: &KeyType) -> &Self::Output {
self.get(key).expect(INTERNAL_ERROR_MSG)
}
}
/// Generate key types for an specific Arg.
fn append_keys(keys: &mut Vec<Key>, arg: &Arg, index: usize) {
if let Some(pos_index) = arg.index {
let key = KeyType::Position(pos_index);
keys.push(Key { key, index });
} else {
if let Some(short) = arg.short {
let key = KeyType::Short(short);
keys.push(Key { key, index });
}
if let Some(long) = arg.long {
let key = KeyType::Long(OsString::from(long));
keys.push(Key { key, index });
}
for (short, _) in arg.short_aliases.iter() {
let key = KeyType::Short(*short);
keys.push(Key { key, index });
}
for (long, _) in arg.aliases.iter() {
let key = KeyType::Long(OsString::from(long));
keys.push(Key { key, index });
}
}
}
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