94 lines
2.7 KiB
Java
94 lines
2.7 KiB
Java
package net.minecraft.util.parsing.packrat;
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import java.util.IdentityHashMap;
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import java.util.List;
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import java.util.Map;
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import java.util.Objects;
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import java.util.function.Supplier;
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import org.jetbrains.annotations.Nullable;
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public class Dictionary<S> {
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private final Map<Atom<?>, Dictionary.Entry<S, ?>> terms = new IdentityHashMap();
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public <T> NamedRule<S, T> put(Atom<T> name, Rule<S, T> rule) {
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Dictionary.Entry<S, T> entry = (Dictionary.Entry<S, T>)this.terms.computeIfAbsent(name, Dictionary.Entry::new);
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if (entry.value != null) {
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throw new IllegalArgumentException("Trying to override rule: " + name);
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} else {
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entry.value = rule;
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return entry;
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}
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}
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public <T> NamedRule<S, T> putComplex(Atom<T> name, Term<S> term, Rule.RuleAction<S, T> ruleAction) {
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return this.put(name, Rule.fromTerm(term, ruleAction));
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}
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public <T> NamedRule<S, T> put(Atom<T> name, Term<S> term, Rule.SimpleRuleAction<S, T> ruleAction) {
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return this.put(name, Rule.fromTerm(term, ruleAction));
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}
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public void checkAllBound() {
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List<? extends Atom<?>> list = this.terms.entrySet().stream().filter(entry -> entry.getValue() == null).map(java.util.Map.Entry::getKey).toList();
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if (!list.isEmpty()) {
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throw new IllegalStateException("Unbound names: " + list);
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}
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}
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public <T> NamedRule<S, T> getOrThrow(Atom<T> name) {
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return (NamedRule<S, T>)Objects.requireNonNull((Dictionary.Entry)this.terms.get(name), () -> "No rule called " + name);
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}
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public <T> NamedRule<S, T> forward(Atom<T> name) {
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return this.getOrCreateEntry(name);
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}
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private <T> Dictionary.Entry<S, T> getOrCreateEntry(Atom<T> name) {
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return (Dictionary.Entry<S, T>)this.terms.computeIfAbsent(name, Dictionary.Entry::new);
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}
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public <T> Term<S> named(Atom<T> name) {
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return new Dictionary.Reference<>(this.getOrCreateEntry(name), name);
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}
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public <T> Term<S> namedWithAlias(Atom<T> name, Atom<T> alias) {
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return new Dictionary.Reference<>(this.getOrCreateEntry(name), alias);
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}
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static class Entry<S, T> implements NamedRule<S, T>, Supplier<String> {
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private final Atom<T> name;
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@Nullable
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Rule<S, T> value;
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private Entry(Atom<T> name) {
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this.name = name;
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}
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@Override
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public Atom<T> name() {
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return this.name;
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}
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@Override
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public Rule<S, T> value() {
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return (Rule<S, T>)Objects.requireNonNull(this.value, this);
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}
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public String get() {
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return "Unbound rule " + this.name;
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}
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}
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record Reference<S, T>(Dictionary.Entry<S, T> ruleToParse, Atom<T> nameToStore) implements Term<S> {
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@Override
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public boolean parse(ParseState<S> parseState, Scope scope, Control control) {
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T object = parseState.parse(this.ruleToParse);
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if (object == null) {
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return false;
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} else {
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scope.put(this.nameToStore, object);
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return true;
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}
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}
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}
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}
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