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Clause.cs
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Clause.cs
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using System;
using System.Collections;
using System.Collections.Generic;
using System.Text;
using System.Linq;
namespace SAT_Solver {
public class Clause : IEnumerable<Literal> {
public List<Literal> Literals { get; }
public int Count => Literals.Count;
public Clause Reverse => new Clause(Literals.Select(x => x.Reverse).ToList());
public Literal this[int key] {
get => Literals[key];
set => Literals[key] = value;
}
public Clause() {
Literals = new List<Literal>();
}
public Clause(Clause clause) {
Literals = new List<Literal>(clause.Literals);
}
public Clause(List<Literal> literals) {
Literals = literals;
}
public void Add(Literal literal) {
for (int i = 0; i < Count; i++) {
if (Literals[i] == literal) {
if (Literals[i].value != literal.value)
Literals.RemoveAt(i);
return;
}
}
Literals.Add(literal);
}
public bool Contains(Literal literal) => Literals.Contains(literal);
public bool ContainsExact(Literal literal) {
foreach (var lit in Literals) {
if (lit.raw == literal.raw) {
return true;
}
}
return false;
}
public void Resolution(Clause other) {
int old = Count;
foreach (var literal in other) {
Add(literal);
}
if (old + other.Count == Count)
throw new Exception("Resolution not possible for given clauses");
}
public bool Match(Clause clause) {
if (Count != clause.Count)
return false;
foreach (var literal in clause) {
if (!ContainsExact(literal)) {
return false;
}
}
return true;
}
public override string ToString() => string.Join(" ", Literals.Select(x => x.ToString()));
public IEnumerator<Literal> GetEnumerator() => Literals.GetEnumerator();
IEnumerator IEnumerable.GetEnumerator() => GetEnumerator();
}
}