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package au.id.zancanaro.javacheck;
import java.util.List;
import java.util.Random;
import java.util.function.Function;
public interface Generator<T> {
RoseTree<T> generate(Random random, int size);
static <T> Generator<T> pure(T value) {
return (random, size) -> RoseTree.pure(value);
}
@SafeVarargs
static <T> Generator<List<T>> tuple(Generator<T>... generators) {
return (random, size) -> {
@SuppressWarnings("unchecked")
RoseTree<T>[] result = (RoseTree<T>[]) new RoseTree[generators.length];
int index = 0;
for (Generator<T> generator : generators) {
result[index++] = generator.generate(random, size);
}
return RoseTree.zip(Function.identity(), result);
};
}
static <T> Generator<List<T>> list(int count, Generator<T> gen) {
return (random, size) -> {
@SuppressWarnings("unchecked")
RoseTree<T>[] result = (RoseTree<T>[]) new RoseTree[count];
for (int i = 0; i < count; ++i) {
result[i] = gen.generate(random, size);
}
return RoseTree.shrink(Function.identity(), result);
};
}
default <R> Generator<R> map(Function<T, R> f) {
return (random, size) -> this.generate(random, size).map(f);
}
default <R> Generator<R> flatMap(Function<T, Generator<R>> action) {
return (random, size) -> RoseTree.join(this.generate(random, size).map(action).map(g -> g.generate(random, size)));
}
}
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