Code/net/minecraft/util/parsing/packrat/Dictionary.java

package net.minecraft.util.parsing.packrat;

import java.util.IdentityHashMap;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.function.Supplier;
import javax.annotation.Nullable;

public class Dictionary<S> {
    private final Map<Atom<?>, Dictionary.Entry<S, ?>> terms = new IdentityHashMap<>();

    public <T> NamedRule<S, T> put(Atom<T> p_333993_, Rule<S, T> p_397298_) {
        Dictionary.Entry<S, T> entry = (Dictionary.Entry<S, T>)this.terms.computeIfAbsent(p_333993_, Dictionary.Entry::new);
        if (entry.value != null) {
            throw new IllegalArgumentException("Trying to override rule: " + p_333993_);
        } else {
            entry.value = p_397298_;
            return entry;
        }
    }

    public <T> NamedRule<S, T> putComplex(Atom<T> p_393852_, Term<S> p_391921_, Rule.RuleAction<S, T> p_393539_) {
        return this.put(p_393852_, Rule.fromTerm(p_391921_, p_393539_));
    }

    public <T> NamedRule<S, T> put(Atom<T> p_329080_, Term<S> p_392956_, Rule.SimpleRuleAction<S, T> p_396305_) {
        return this.put(p_329080_, Rule.fromTerm(p_392956_, p_396305_));
    }

    public void checkAllBound() {
        List<? extends Atom<?>> list = this.terms.entrySet().stream().filter(p_396134_ -> p_396134_.getValue() == null).map(Map.Entry::getKey).toList();
        if (!list.isEmpty()) {
            throw new IllegalStateException("Unbound names: " + list);
        }
    }

    public <T> NamedRule<S, T> getOrThrow(Atom<T> p_397598_) {
        return (NamedRule<S, T>)Objects.requireNonNull(this.terms.get(p_397598_), () -> "No rule called " + p_397598_);
    }

    public <T> NamedRule<S, T> forward(Atom<T> p_392500_) {
        return this.getOrCreateEntry(p_392500_);
    }

    private <T> Dictionary.Entry<S, T> getOrCreateEntry(Atom<T> p_395883_) {
        return (Dictionary.Entry<S, T>)this.terms.computeIfAbsent(p_395883_, Dictionary.Entry::new);
    }

    public <T> Term<S> named(Atom<T> p_392444_) {
        return new Dictionary.Reference<>(this.getOrCreateEntry(p_392444_), p_392444_);
    }

    public <T> Term<S> namedWithAlias(Atom<T> p_396057_, Atom<T> p_391365_) {
        return new Dictionary.Reference<>(this.getOrCreateEntry(p_396057_), p_391365_);
    }

    static class Entry<S, T> implements NamedRule<S, T>, Supplier<String> {
        private final Atom<T> name;
        @Nullable
        Rule<S, T> value;

        private Entry(Atom<T> p_396611_) {
            this.name = p_396611_;
        }

        @Override
        public Atom<T> name() {
            return this.name;
        }

        @Override
        public Rule<S, T> value() {
            return Objects.requireNonNull(this.value, this);
        }

        public String get() {
            return "Unbound rule " + this.name;
        }
    }

    record Reference<S, T>(Dictionary.Entry<S, T> ruleToParse, Atom<T> nameToStore) implements Term<S> {
        @Override
        public boolean parse(ParseState<S> p_397182_, Scope p_391380_, Control p_391695_) {
            T t = p_397182_.parse(this.ruleToParse);
            if (t == null) {
                return false;
            } else {
                p_391380_.put(this.nameToStore, t);
                return true;
            }
        }
    }
}