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using unmemoized relational implementation
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186 changes: 186 additions & 0 deletions
186
razor-chase/src/chase/impl/relational/equation_rewrite.rs
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Original file line number | Diff line number | Diff line change |
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use std::{collections::HashMap, hash::Hash}; | ||
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pub(super) struct Rewrite<T> | ||
where | ||
T: PartialEq + Eq + Clone + Hash, | ||
{ | ||
rules: HashMap<T, T>, | ||
} | ||
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impl<T> Rewrite<T> | ||
where | ||
T: PartialEq + Eq + Clone + Hash, | ||
{ | ||
pub fn new() -> Self { | ||
Self { | ||
rules: HashMap::new(), | ||
} | ||
} | ||
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pub fn add(&mut self, left: &T, right: &T) { | ||
if self.equals(left, right) == Some(true) { | ||
return; | ||
} | ||
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let left = self | ||
.rules | ||
.entry(left.clone()) | ||
.or_insert(right.clone()) | ||
.clone(); | ||
let right = self | ||
.rules | ||
.entry(right.clone()) | ||
.or_insert(right.clone()) | ||
.clone(); | ||
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self.rules.iter_mut().for_each(|(_, v)| { | ||
if *v == left { | ||
*v = right.clone() | ||
} | ||
}); | ||
} | ||
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pub fn equals(&self, left: &T, right: &T) -> Option<bool> { | ||
let left = self.rules.get(left)?; | ||
let right = self.rules.get(right)?; | ||
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Some(left == right) | ||
} | ||
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pub fn canonical(&self, item: &T) -> Option<&T> { | ||
self.rules.get(item) | ||
} | ||
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pub fn canonicals(&self) -> Vec<&T> { | ||
use itertools::Itertools; | ||
self.rules.values().unique().collect() | ||
} | ||
} | ||
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#[cfg(test)] | ||
mod tests { | ||
use super::*; | ||
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#[test] | ||
fn test_basic() { | ||
let mut rewrite = Rewrite::new(); | ||
rewrite.add(&1, &11); | ||
rewrite.add(&2, &22); | ||
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assert_eq!(Some(true), rewrite.equals(&1, &11)); | ||
assert_eq!(Some(false), rewrite.equals(&2, &11)); | ||
assert_eq!(None, rewrite.equals(&2, &3)); | ||
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assert_eq!(Some(&11), rewrite.canonical(&1)); | ||
assert_eq!(Some(&22), rewrite.canonical(&22)); | ||
assert_eq!(None, rewrite.canonical(&3)); | ||
} | ||
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#[test] | ||
fn test_merge_classes() { | ||
{ | ||
let mut rewrite = Rewrite::new(); | ||
rewrite.add(&1, &11); | ||
rewrite.add(&1, &111); | ||
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assert_eq!(Some(true), rewrite.equals(&1, &11)); | ||
assert_eq!(Some(true), rewrite.equals(&1, &111)); | ||
assert_eq!(Some(true), rewrite.equals(&11, &111)); | ||
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assert_eq!(Some(&111), rewrite.canonical(&1)); | ||
assert_eq!(Some(&111), rewrite.canonical(&11)); | ||
assert_eq!(Some(&111), rewrite.canonical(&111)); | ||
} | ||
{ | ||
let mut rewrite = Rewrite::new(); | ||
rewrite.add(&1, &11); | ||
rewrite.add(&11, &111); | ||
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assert_eq!(Some(true), rewrite.equals(&1, &11)); | ||
assert_eq!(Some(true), rewrite.equals(&1, &111)); | ||
assert_eq!(Some(true), rewrite.equals(&11, &111)); | ||
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assert_eq!(Some(&111), rewrite.canonical(&1)); | ||
assert_eq!(Some(&111), rewrite.canonical(&11)); | ||
assert_eq!(Some(&111), rewrite.canonical(&111)); | ||
} | ||
{ | ||
let mut rewrite = Rewrite::new(); | ||
rewrite.add(&1, &11); | ||
rewrite.add(&2, &22); | ||
rewrite.add(&11, &111); | ||
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assert_eq!(Some(false), rewrite.equals(&1, &22)); | ||
assert_eq!(Some(false), rewrite.equals(&11, &22)); | ||
assert_eq!(Some(false), rewrite.equals(&11, &22)); | ||
} | ||
} | ||
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#[test] | ||
fn test_merge_multiple_classes() { | ||
{ | ||
let mut rewrite = Rewrite::new(); | ||
rewrite.add(&1, &11); | ||
rewrite.add(&2, &22); | ||
rewrite.add(&1, &2); | ||
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assert_eq!(Some(true), rewrite.equals(&1, &11)); | ||
assert_eq!(Some(true), rewrite.equals(&1, &22)); | ||
assert_eq!(Some(true), rewrite.equals(&2, &11)); | ||
assert_eq!(Some(true), rewrite.equals(&2, &22)); | ||
assert_eq!(Some(true), rewrite.equals(&1, &2)); | ||
assert_eq!(Some(true), rewrite.equals(&11, &22)); | ||
} | ||
{ | ||
let mut rewrite = Rewrite::new(); | ||
rewrite.add(&1, &11); | ||
rewrite.add(&2, &22); | ||
rewrite.add(&1, &22); | ||
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assert_eq!(Some(true), rewrite.equals(&1, &11)); | ||
assert_eq!(Some(true), rewrite.equals(&1, &22)); | ||
assert_eq!(Some(true), rewrite.equals(&2, &11)); | ||
assert_eq!(Some(true), rewrite.equals(&2, &22)); | ||
assert_eq!(Some(true), rewrite.equals(&1, &2)); | ||
assert_eq!(Some(true), rewrite.equals(&11, &22)); | ||
} | ||
{ | ||
let mut rewrite = Rewrite::new(); | ||
rewrite.add(&1, &11); | ||
rewrite.add(&2, &22); | ||
rewrite.add(&2, &1); | ||
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assert_eq!(Some(true), rewrite.equals(&1, &11)); | ||
assert_eq!(Some(true), rewrite.equals(&1, &22)); | ||
assert_eq!(Some(true), rewrite.equals(&2, &11)); | ||
assert_eq!(Some(true), rewrite.equals(&2, &22)); | ||
assert_eq!(Some(true), rewrite.equals(&1, &2)); | ||
assert_eq!(Some(true), rewrite.equals(&11, &22)); | ||
} | ||
{ | ||
let mut rewrite = Rewrite::new(); | ||
rewrite.add(&1, &11); | ||
rewrite.add(&2, &22); | ||
rewrite.add(&2, &11); | ||
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assert_eq!(Some(true), rewrite.equals(&1, &11)); | ||
assert_eq!(Some(true), rewrite.equals(&1, &22)); | ||
assert_eq!(Some(true), rewrite.equals(&2, &11)); | ||
assert_eq!(Some(true), rewrite.equals(&2, &22)); | ||
assert_eq!(Some(true), rewrite.equals(&1, &2)); | ||
assert_eq!(Some(true), rewrite.equals(&11, &22)); | ||
} | ||
{ | ||
let mut rewrite = Rewrite::new(); | ||
rewrite.add(&1, &11); | ||
rewrite.add(&2, &22); | ||
rewrite.add(&11, &111); | ||
rewrite.add(&2, &222); | ||
rewrite.add(&1, &2); | ||
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assert_eq!(Some(true), rewrite.equals(&1, &2)); | ||
assert_eq!(Some(true), rewrite.equals(&11, &22)); | ||
assert_eq!(Some(true), rewrite.equals(&111, &222)); | ||
} | ||
} | ||
} |
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