Regular-Expresso Changeset

Changeset - e93b264ec5cc

Parent rev.

Child rev.

[Not reviewed]

default

0 1 4

Laman - 10 months ago 2024-06-16 17:20:43

reorganized the code

5 files changed with 30 insertions and 674 deletions:

src/lib.rs

src/main.rs

321

src/regexp.rs

196

src/regexp/token.rs

157

tests/test_regexp.rs

0 comments (0 inline, 0 general)

src/lib.rs

➞

Show inline comments

		new file 100644
		mod regexp;
		pub use regexp::Regexp;

src/main.rs

➞

Show inline comments

 use std::collections::{HashMap, HashSet};
 const START: usize = usize::MAX;
 trait Token {
 	fn is_skippable(&self) -> bool {false}
 	fn list_first(&self) -> Vec<usize>;
 	fn list_last(&self) -> Vec<usize>;
 	fn list_neighbours(&self) -> Vec<(usize, usize)>;
+}
 struct Symbol {
 	position: usize,
 	value: char
+}
 struct Asterisk {
 	content: Box<dyn Token>
+}
 struct Plus {
 	content: Box<dyn Token>
+}
 struct Chain {
 	content: Vec<Box<dyn Token>>
+}
 impl Token for Symbol {
 	fn list_first(&self) -> Vec<usize> {
 		return vec![self.position];
+	}
 	fn list_last(&self) -> Vec<usize> {
 		return vec![self.position];
+	}
 	fn list_neighbours(&self) -> Vec<(usize, usize)> {
 		return vec![];
+	}
+}
 impl Token for Asterisk {
 	fn is_skippable(&self) -> bool {true}
 	fn list_first(&self) -> Vec<usize> {
 		return self.content.list_first();
+	}
 	fn list_last(&self) -> Vec<usize> {
 		return self.content.list_last();
+	}
 	fn list_neighbours(&self) -> Vec<(usize, usize)> {
 		let mut res = self.content.list_neighbours();
 		for x in self.list_last() {
 			for y in self.list_first() {
 				res.push((x, y));
+			}
+		}
 		return res;
+	}
+}
 impl Token for Plus {
 	fn list_first(&self) -> Vec<usize> {
 		return self.content.list_first();
+	}
 	fn list_last(&self) -> Vec<usize> {
 		return self.content.list_last();
+	}
 	fn list_neighbours(&self) -> Vec<(usize, usize)> {
 		let mut res = self.content.list_neighbours();
 		for x in self.list_last() {
 			for y in self.list_first() {
 				res.push((x, y));
+			}
+		}
 		return res;
+	}
+}
 impl Token for Chain {
 	fn is_skippable(&self) -> bool {
 		return self.content.iter().all(|x| x.is_skippable());
+	}
 	fn list_first(&self) -> Vec<usize> {
 		let mut res = Vec::new();
 		for token in self.content.iter() {
 			res.append(&mut token.list_first());
 			if !token.is_skippable() {break;}
+		}
 		return res;
+	}
 	fn list_last(&self) -> Vec<usize> {
 		let mut res = Vec::new();
 		for token in self.content.iter().rev() {
 			res.append(&mut token.list_last());
 			if !token.is_skippable() {break;}
+		}
 		return res;
+	}
 	fn list_neighbours(&self) -> Vec<(usize, usize)> {
 		let mut res = Vec::new();
 		let mut previous: Vec<&Box<dyn Token>> = Vec::new();
 		for token in self.content.iter() {
 			for t in previous.iter() {
 				for x in t.list_last() {
 					for y in token.list_first() {
 						res.push((x, y));
+					}
+				}
+			}
 			res.append(&mut token.list_neighbours());
 			if token.is_skippable() {
 				previous.push(token);
 			} else {
 				previous = vec![token];
+			}
+		}
 		return res;
+	}
+}
 fn find_closing_parenthesis(s: &String) -> Option<usize> {
 	let chars: Vec<char> = s.chars().collect();
 	let mut counter = 0;
 	for (i, c) in chars.iter().enumerate() {
 		if *c == '(' {counter += 1;}
 		else if *c == ')' {counter -= 1;}
 		if counter == 0 {return Some(i);}
+	}
 	return None;
+}
 fn parse(pattern: &String, offset: usize) -> Chain {
 	let chars: Vec<char> = pattern.chars().collect();
 	let mut res: Vec<Box<dyn Token>> = Vec::new();
 	let mut i = 0;
 	while i < pattern.len() {
 		let c = chars[i];
 		match c {
 			'(' => {
 				let j = find_closing_parenthesis(&pattern[i..].to_string()).unwrap() + i;
 				let inner_content = parse(&pattern[i+1..j].to_string(), offset+i+1);
 				res.push(Box::new(inner_content));
 				i = j+1;
+			}
 			'*' => {
 				let token = res.pop().unwrap();
 				res.push(Box::new(Asterisk{content: token}));
 				i += 1;
+			}
 			'+' => {
 				let token = res.pop().unwrap();
 				res.push(Box::new(Plus{content: token}));
 				i += 1;
+			}
 			c => {
 				res.push(Box::new(Symbol{position: i+offset, value: c}));
 				i += 1;
+			}
+		}
+	}
 	return Chain{content: res};
+}
 fn encode_set(set: &HashSet<usize>) -> u64 {
 	let mut res = 0;
 	for x in set.iter() {
 		res ^= 1<<x;
+	}
 	return res;
+}
 fn decode_set(x: u64) ->HashSet<usize> {
 	if x == START as u64 {return HashSet::from([START]);}
 	let mut x = x;
 	let mut res: HashSet<usize> = HashSet::new();
 	while x > 0 {
 		let y = x.trailing_zeros();
 		res.insert(y as usize);
 		x ^= 1 << y;
+	}
 	return res;
+}
 struct Regexp {
 	rules: HashMap<(usize, char), HashSet<usize>>,
 	end_states: HashSet<usize>
+}
 impl Regexp {
 	fn new(pattern: &String) -> Regexp {
 		let r = parse(pattern, 0);
 		let pattern_chars = Vec::from_iter(pattern.chars());
 		let mut rules: HashMap<(usize, char), HashSet<usize>> = HashMap::new();
 		for i in r.list_first() {
 			let c = pattern_chars[i];
 			let key = (START, c);
 			match rules.get_mut(&key) {
 				Some(set) => {set.insert(i);},
 				None => {rules.insert(key, HashSet::from([i]));}
 			};
+		}
 		for (i, j) in r.list_neighbours() {
 			let c = pattern_chars[j];
 			let key = (i, c);
 			match rules.get_mut(&key) {
 				Some(set) => {set.insert(j);},
 				None => {rules.insert(key, HashSet::from([j]));}
 			};
+		}
 		let mut end_states = HashSet::from_iter(r.list_last().into_iter());
 		if r.is_skippable() {
 			end_states.insert(START);
+		}
 		return Regexp{rules, end_states};
+	}
 	pub fn eval(&self, s: String) -> bool {
 		let mut multistate = HashSet::from([START]);
 		for c in s.chars() {
 			let mut new_multistate = HashSet::new();
 			for state in multistate {
 				if let Some(x) = self.rules.get(&(state, c)) {
 					new_multistate = new_multistate.union(&x).map(|&y| y).collect();
 				} else if let Some(x) = self.rules.get(&(state, '.')) {
 					new_multistate = new_multistate.union(&x).map(|&y| y).collect();
+				}
+			}
 			multistate = new_multistate;
+		}
 		return multistate.iter().any(|x| self.end_states.contains(x));
+	}
 	fn determinize(&self) -> RegexpDFA {
 		let mut rules: HashMap<(u64, char), u64> = HashMap::new();
 		let mut end_states: HashSet<u64> = HashSet::new();
 		if self.end_states.contains(&START) {end_states.insert(START as u64);}
 		let mut stack = Vec::from([START as u64]);
 		let mut processed_states = HashSet::new();
 		while !stack.is_empty() {
 			let state = stack.pop().unwrap();
 			let multistate = decode_set(state);
 			let mut new_rules: HashMap<char, HashSet<usize>> = HashMap::new();
 			for key in self.rules.keys().filter(|key| multistate.contains(&key.0)) {
 				let (_st, c) = key;
 				if !new_rules.contains_key(c) {
 					new_rules.insert(*c, HashSet::new());
+				}
 				for target in &self.rules[key] {
 					new_rules.get_mut(c).unwrap().insert(*target);
+				}
+			}
 			for (c, target_set) in new_rules.into_iter() {
 				let encoded_target = encode_set(&target_set);
 				rules.insert((state, c), encoded_target);
 				if target_set.iter().any(|st| self.end_states.contains(st)) {
 					end_states.insert(encoded_target);
+				}
 				if !processed_states.contains(&encoded_target) {
 					stack.push(encoded_target);
 					processed_states.insert(encoded_target);
+				}
+			}
+		}
 		return RegexpDFA{rules, end_states};
+	}
+}
 struct RegexpDFA {
 	rules: HashMap<(u64, char), u64>,
 	end_states: HashSet<u64>
+}
 impl RegexpDFA {
 	fn eval(&self, s: String) -> bool {
 		let mut state = START as u64;
 		for c in s.chars() {
 			if let Some(x) = self.rules.get(&(state, c)) {
 				state = *x;
 			} else {
 				return false;
+			}
+		}
 		return self.end_states.contains(&state);
+	}
+}
 use regexp::Regexp;
 fn main() {
 	let tests = ["", "a", "ab", "aabb", "abab", "abcd", "abcbcdbcd"];

src/regexp.rs

➞

Show inline comments

@@ file copied from src/main.rs to src/regexp.rs @@
 use std::collections::{HashMap, HashSet};
 mod token;
 use token::{Token, parse};
 const START: usize = usize::MAX;
 trait Token {
 	fn is_skippable(&self) -> bool {false}
 	fn list_first(&self) -> Vec<usize>;
 	fn list_last(&self) -> Vec<usize>;
 	fn list_neighbours(&self) -> Vec<(usize, usize)>;
+}
 struct Symbol {
 	position: usize,
 	value: char
+}
 struct Asterisk {
 	content: Box<dyn Token>
+}
 struct Plus {
 	content: Box<dyn Token>
+}
 struct Chain {
 	content: Vec<Box<dyn Token>>
+}
 impl Token for Symbol {
 	fn list_first(&self) -> Vec<usize> {
 		return vec![self.position];
+	}
 	fn list_last(&self) -> Vec<usize> {
 		return vec![self.position];
+	}
 	fn list_neighbours(&self) -> Vec<(usize, usize)> {
 		return vec![];
+	}
+}
 impl Token for Asterisk {
 	fn is_skippable(&self) -> bool {true}
 	fn list_first(&self) -> Vec<usize> {
 		return self.content.list_first();
+	}
 	fn list_last(&self) -> Vec<usize> {
 		return self.content.list_last();
+	}
 	fn list_neighbours(&self) -> Vec<(usize, usize)> {
 		let mut res = self.content.list_neighbours();
 		for x in self.list_last() {
 			for y in self.list_first() {
 				res.push((x, y));
+			}
+		}
 		return res;
+	}
+}
 impl Token for Plus {
 	fn list_first(&self) -> Vec<usize> {
 		return self.content.list_first();
+	}
 	fn list_last(&self) -> Vec<usize> {
 		return self.content.list_last();
+	}
 	fn list_neighbours(&self) -> Vec<(usize, usize)> {
 		let mut res = self.content.list_neighbours();
 		for x in self.list_last() {
 			for y in self.list_first() {
 				res.push((x, y));
+			}
+		}
 		return res;
+	}
+}
 impl Token for Chain {
 	fn is_skippable(&self) -> bool {
 		return self.content.iter().all(|x| x.is_skippable());
+	}
 	fn list_first(&self) -> Vec<usize> {
 		let mut res = Vec::new();
 		for token in self.content.iter() {
 			res.append(&mut token.list_first());
 			if !token.is_skippable() {break;}
+		}
 		return res;
+	}
 	fn list_last(&self) -> Vec<usize> {
 		let mut res = Vec::new();
 		for token in self.content.iter().rev() {
 			res.append(&mut token.list_last());
 			if !token.is_skippable() {break;}
+		}
 		return res;
+	}
 	fn list_neighbours(&self) -> Vec<(usize, usize)> {
 		let mut res = Vec::new();
 		let mut previous: Vec<&Box<dyn Token>> = Vec::new();
 		for token in self.content.iter() {
 			for t in previous.iter() {
 				for x in t.list_last() {
 					for y in token.list_first() {
 						res.push((x, y));
+					}
+				}
+			}
 			res.append(&mut token.list_neighbours());
 			if token.is_skippable() {
 				previous.push(token);
 			} else {
 				previous = vec![token];
+			}
+		}
 		return res;
+	}
+}
 fn find_closing_parenthesis(s: &String) -> Option<usize> {
 	let chars: Vec<char> = s.chars().collect();
 	let mut counter = 0;
 	for (i, c) in chars.iter().enumerate() {
 		if *c == '(' {counter += 1;}
 		else if *c == ')' {counter -= 1;}
 		if counter == 0 {return Some(i);}
+	}
 	return None;
+}
 fn parse(pattern: &String, offset: usize) -> Chain {
 	let chars: Vec<char> = pattern.chars().collect();
 	let mut res: Vec<Box<dyn Token>> = Vec::new();
 	let mut i = 0;
 	while i < pattern.len() {
 		let c = chars[i];
 		match c {
 			'(' => {
 				let j = find_closing_parenthesis(&pattern[i..].to_string()).unwrap() + i;
 				let inner_content = parse(&pattern[i+1..j].to_string(), offset+i+1);
 				res.push(Box::new(inner_content));
 				i = j+1;
+			}
 			'*' => {
 				let token = res.pop().unwrap();
 				res.push(Box::new(Asterisk{content: token}));
 				i += 1;
+			}
 			'+' => {
 				let token = res.pop().unwrap();
 				res.push(Box::new(Plus{content: token}));
 				i += 1;
+			}
 			c => {
 				res.push(Box::new(Symbol{position: i+offset, value: c}));
 				i += 1;
+			}
+		}
+	}
 	return Chain{content: res};
+}
 fn encode_set(set: &HashSet<usize>) -> u64 {
 	let mut res = 0;
 	for x in set.iter() {
@@ @@ -204,13 +28,13 @@ fn decode_set(x: u64) ->HashSet<usize> { @@
 	return res;
+}
 struct Regexp {
+pub struct Regexp {
 	rules: HashMap<(usize, char), HashSet<usize>>,
 	end_states: HashSet<usize>
+}
 impl Regexp {
 	fn new(pattern: &String) -> Regexp {
+	pub fn new(pattern: &String) -> Regexp {
 		let r = parse(pattern, 0);
 		let pattern_chars = Vec::from_iter(pattern.chars());
 		let mut rules: HashMap<(usize, char), HashSet<usize>> = HashMap::new();
@@ @@ -260,7 +84,7 @@ impl Regexp { @@
 		return multistate.iter().any(|x| self.end_states.contains(x));
+	}
 	fn determinize(&self) -> RegexpDFA {
+	pub fn determinize(&self) -> RegexpDFA {
 		let mut rules: HashMap<(u64, char), u64> = HashMap::new();
 		let mut end_states: HashSet<u64> = HashSet::new();
 		if self.end_states.contains(&START) {end_states.insert(START as u64);}
@@ @@ -299,13 +123,13 @@ impl Regexp { @@
+	}
+}
 struct RegexpDFA {
+pub struct RegexpDFA {
 	rules: HashMap<(u64, char), u64>,
 	end_states: HashSet<u64>
+}
 impl RegexpDFA {
 	fn eval(&self, s: String) -> bool {
+	pub fn eval(&self, s: String) -> bool {
 		let mut state = START as u64;
 		for c in s.chars() {
@@ @@ -319,15 +143,3 @@ impl RegexpDFA { @@
 		return self.end_states.contains(&state);
+	}
+}
 fn main() {
 	let tests = ["", "a", "ab", "aabb", "abab", "abcd", "abcbcdbcd"];
 	for pattern in ["a*b*", "a+b+", "(ab)*", "(ab)+", "a((bc)*d)*"] {
 		println!("# {pattern}");
 		let r = Regexp::new(&pattern.to_string()).determinize();
 		for &t in tests.iter() {
 			println!("{t} {}", r.eval(t.to_string()));
+		}
 		println!();
+	}
+}

src/regexp/token.rs

➞

Show inline comments

@@ file copied from src/main.rs to src/regexp/token.rs @@
 use std::collections::{HashMap, HashSet};
 const START: usize = usize::MAX;
 trait Token {
 pub trait Token {
 	fn is_skippable(&self) -> bool {false}
 	fn list_first(&self) -> Vec<usize>;
 	fn list_last(&self) -> Vec<usize>;
 	fn list_neighbours(&self) -> Vec<(usize, usize)>;
+}
 struct Symbol {
+pub struct Symbol {
 	position: usize,
 	value: char
+}
 struct Asterisk {
+pub struct Asterisk {
 	content: Box<dyn Token>
+}
 struct Plus {
+pub struct Plus {
 	content: Box<dyn Token>
+}
 struct Chain {
+pub struct Chain {
 	content: Vec<Box<dyn Token>>
+}
@@ @@ -148,7 +144,7 @@ fn find_closing_parenthesis(s: &String) @@
 	return None;
+}
 fn parse(pattern: &String, offset: usize) -> Chain {
+pub fn parse(pattern: &String, offset: usize) -> Chain {
 	let chars: Vec<char> = pattern.chars().collect();
 	let mut res: Vec<Box<dyn Token>> = Vec::new();
 	let mut i = 0;
@@ @@ -181,153 +177,12 @@ fn parse(pattern: &String, offset: usize @@
 	return Chain{content: res};
+}
 fn encode_set(set: &HashSet<usize>) -> u64 {
 	let mut res = 0;
 	for x in set.iter() {
 		res ^= 1<<x;
+	}
 	return res;
+}
 fn decode_set(x: u64) ->HashSet<usize> {
 	if x == START as u64 {return HashSet::from([START]);}
 	let mut x = x;
 	let mut res: HashSet<usize> = HashSet::new();
 	while x > 0 {
 		let y = x.trailing_zeros();
 		res.insert(y as usize);
 		x ^= 1 << y;
+	}
 	return res;
+}
 struct Regexp {
 	rules: HashMap<(usize, char), HashSet<usize>>,
 	end_states: HashSet<usize>
+}
 impl Regexp {
 	fn new(pattern: &String) -> Regexp {
 		let r = parse(pattern, 0);
 		let pattern_chars = Vec::from_iter(pattern.chars());
 		let mut rules: HashMap<(usize, char), HashSet<usize>> = HashMap::new();
 		for i in r.list_first() {
 			let c = pattern_chars[i];
 			let key = (START, c);
 			match rules.get_mut(&key) {
 				Some(set) => {set.insert(i);},
 				None => {rules.insert(key, HashSet::from([i]));}
 			};
+		}
 		for (i, j) in r.list_neighbours() {
 			let c = pattern_chars[j];
 			let key = (i, c);
 			match rules.get_mut(&key) {
 				Some(set) => {set.insert(j);},
 				None => {rules.insert(key, HashSet::from([j]));}
 			};
+		}
 		let mut end_states = HashSet::from_iter(r.list_last().into_iter());
 		if r.is_skippable() {
 			end_states.insert(START);
+		}
 mod test {
 	use super::*;
 		return Regexp{rules, end_states};
+	}
 	pub fn eval(&self, s: String) -> bool {
 		let mut multistate = HashSet::from([START]);
 		for c in s.chars() {
 			let mut new_multistate = HashSet::new();
 			for state in multistate {
 				if let Some(x) = self.rules.get(&(state, c)) {
 					new_multistate = new_multistate.union(&x).map(|&y| y).collect();
 				} else if let Some(x) = self.rules.get(&(state, '.')) {
 					new_multistate = new_multistate.union(&x).map(|&y| y).collect();
+				}
+			}
 			multistate = new_multistate;
+		}
 		return multistate.iter().any(|x| self.end_states.contains(x));
+	}
 	fn determinize(&self) -> RegexpDFA {
 		let mut rules: HashMap<(u64, char), u64> = HashMap::new();
 		let mut end_states: HashSet<u64> = HashSet::new();
 		if self.end_states.contains(&START) {end_states.insert(START as u64);}
 		let mut stack = Vec::from([START as u64]);
 		let mut processed_states = HashSet::new();
 		while !stack.is_empty() {
 			let state = stack.pop().unwrap();
 			let multistate = decode_set(state);
 			let mut new_rules: HashMap<char, HashSet<usize>> = HashMap::new();
 			for key in self.rules.keys().filter(|key| multistate.contains(&key.0)) {
 				let (_st, c) = key;
 				if !new_rules.contains_key(c) {
 					new_rules.insert(*c, HashSet::new());
+				}
 				for target in &self.rules[key] {
 					new_rules.get_mut(c).unwrap().insert(*target);
+				}
+			}
 			for (c, target_set) in new_rules.into_iter() {
 				let encoded_target = encode_set(&target_set);
 				rules.insert((state, c), encoded_target);
 				if target_set.iter().any(|st| self.end_states.contains(st)) {
 					end_states.insert(encoded_target);
+				}
 				if !processed_states.contains(&encoded_target) {
 					stack.push(encoded_target);
 					processed_states.insert(encoded_target);
+				}
+			}
+		}
 		return RegexpDFA{rules, end_states};
 	#[test]
 	fn test_closing_parenthesis() {
 		let s = "()";
 		assert_eq!(find_closing_parenthesis(&s.to_string()), Some(1));
+	}
+}
 struct RegexpDFA {
 	rules: HashMap<(u64, char), u64>,
 	end_states: HashSet<u64>
+}
 impl RegexpDFA {
 	fn eval(&self, s: String) -> bool {
 		let mut state = START as u64;
 		for c in s.chars() {
 			if let Some(x) = self.rules.get(&(state, c)) {
 				state = *x;
 			} else {
 				return false;
+			}
+		}
 		return self.end_states.contains(&state);
+	}
+}
 fn main() {
 	let tests = ["", "a", "ab", "aabb", "abab", "abcd", "abcbcdbcd"];
 	for pattern in ["a*b*", "a+b+", "(ab)*", "(ab)+", "a((bc)*d)*"] {
 		println!("# {pattern}");
 		let r = Regexp::new(&pattern.to_string()).determinize();
 		for &t in tests.iter() {
 			println!("{t} {}", r.eval(t.to_string()));
+		}
 		println!();
+	}
+}

tests/test_regexp.rs

➞

Show inline comments

@@ new file 100644 @@
 use regexp::Regexp;
 #[test]
 fn test_eval() {
 	let r = Regexp::new(&String::from("(ab)*"));
 	assert!(r.eval(String::from("ab")));
+}

0 comments (0 inline, 0 general)