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#![crate_name = "stal"]
#![crate_type = "lib"]
#[derive(Clone)]
pub enum Set {
Key(Vec<u8>),
Union(Vec<Set>),
Inter(Vec<Set>),
Diff(Vec<Set>),
}
use Set::*;
impl Set {
pub fn into_ids(self) -> Stal {
let (op, sets) = match self {
Key(_) => return Stal::from_template(vec![b"SMEMBERS".to_vec(), vec![]], vec![(self, 1)]),
Union(sets) => ("SUNION", sets),
Inter(sets) => ("SINTER", sets),
Diff(sets) => ("SDIFF", sets),
};
let mut command = vec![op.as_bytes().to_vec()];
command.extend(sets.iter().map(|_| vec![]).collect::<Vec<_>>());
let mut setv = vec![];
let mut i = 1;
for set in sets.into_iter() {
setv.push((set, i));
i += 1;
}
Stal::from_template(command, setv)
}
pub fn ids(&self) -> Stal {
let (op, sets) = match *self {
Key(_) => return Stal::from_template(vec![b"SMEMBERS".to_vec(), vec![]], vec![(self.clone(), 1)]),
Union(ref sets) => ("SUNION", sets),
Inter(ref sets) => ("SINTER", sets),
Diff(ref sets) => ("SDIFF", sets),
};
let mut command = vec![op.as_bytes().to_vec()];
command.extend(sets.iter().map(|_| vec![]).collect::<Vec<_>>());
let mut setv = vec![];
for i in 0..sets.len() {
setv.push((sets[i].clone(), i + 1));
}
Stal::from_template(command, setv)
}
fn command(&self) -> &'static str {
match *self {
Key(_) => unreachable!(),
Union(_) => "SUNIONSTORE",
Inter(_) => "SINTERSTORE",
Diff(_) => "SDIFFSTORE",
}
}
pub fn convert(&self, ids: &mut Vec<String>, ops: &mut Vec<Vec<Vec<u8>>>) -> Vec<u8> {
let sets = match *self {
Key(ref k) => return k.clone(),
Union(ref sets) => sets,
Inter(ref sets) => sets,
Diff(ref sets) => sets,
};
let mut op = Vec::with_capacity(2 + sets.len());
let id = format!("stal:{}", ids.len());
let r = id.as_bytes().to_vec();
ids.push(id);
op.push(self.command().as_bytes().to_vec());
op.push(r.clone());
op.extend(sets.into_iter().map(|s| s.convert(ids, ops)));
ops.push(op);
r
}
}
pub struct Stal {
command: Vec<Vec<u8>>,
sets: Vec<(Set, usize)>,
}
impl Stal {
pub fn new(operation: String, set: Set) -> Self {
Stal {
command: vec![operation.as_bytes().to_vec(), vec![]],
sets: vec![(set, 1)],
}
}
pub fn from_template(command: Vec<Vec<u8>>, sets: Vec<(Set, usize)>) -> Self {
Stal {
command: command,
sets: sets,
}
}
fn add_ops(&self, ids: &mut Vec<String>, ops: &mut Vec<Vec<Vec<u8>>>) {
let mut command = self.command.clone();
for args in self.sets.iter() {
command.push(args.0.convert(ids, ops));
command.swap_remove(args.1);
}
ops.push(command);
}
pub fn explain(&self) -> Vec<Vec<Vec<u8>>> {
let mut ids = vec![];
let mut ops = vec![];
self.add_ops(&mut ids, &mut ops);
ops
}
pub fn solve(&self) -> (Vec<Vec<Vec<u8>>>, usize) {
let mut ids = vec![];
let mut ops = vec![vec![b"MULTI".to_vec()]];
self.add_ops(&mut ids, &mut ops);
let pos = ops.len() - 1;
if ids.len() > 0 {
let mut del = vec![b"DEL".to_vec()];
del.extend(ids.into_iter().map(|x| x.as_bytes().to_vec()));
ops.push(del);
}
ops.push(vec![b"EXEC".to_vec()]);
(ops, pos)
}
}