pinapod 0.4.2

Zero-copy pod types with derive macros. Alignment-1 representations for zero-overhead data access.
Documentation 
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//! Container storage remains initialized when copied into account bytes.
#![forbid(unsafe_code)]
#![allow(
	missing_docs,
	reason = "these are test fixtures rather than a published surface, so their schemas stay \
	          undocumented"
)]

use pinapod::PinaPod;
use pinapod::PinaPodError;
use pinapod::pod::PodOption;
use pinapod::pod::PodString;
use pinapod::pod::PodU16;
use pinapod::pod::PodVec;

#[allow(dead_code)]
#[derive(PinaPod)]
struct FixedContainers {
	pub text: PodString<8>,
	pub values: PodVec<PodU16, 3>,
	pub optional_text: PodOption<PodString<4>>,
}

#[allow(dead_code)]
#[derive(PinaPod)]
#[pinapod(compact)]
struct CompactContainers {
	pub values: pinapod::Vec<pinapod::String<4>, 2>,
}

#[allow(dead_code)]
#[derive(PinaPod)]
struct OptionalText {
	pub value: PodOption<PodString<4>>,
}

#[allow(dead_code)]
#[derive(PinaPod)]
struct VectorBytes {
	pub values: PodVec<u16, 4>,
}

#[allow(dead_code)]
#[derive(PinaPod)]
struct StringBytes {
	pub value: PodString<8>,
}

#[test]
fn assigning_default_containers_keeps_every_account_byte_initialized() {
	let mut bytes = [0; FixedContainers::SIZE];

	{
		let view = FixedContainers::read_exact_mut(&mut bytes).unwrap();
		view.text = PodString::default();
		view.values = PodVec::<u16, 3>::default();
		view.optional_text = PodOption::some(PodString::default());
	}

	let mut expected = [0; FixedContainers::SIZE];
	expected[17] = 1;

	// Reading the complete byte slice also checks inactive capacity under Miri.
	assert_eq!(bytes, expected);
}

#[test]
fn compact_copy_initializes_inactive_capacity_in_nested_containers() {
	let mut bytes = [0; 7];
	let mut text = PodString::<4>::default();
	text.try_set("hi").unwrap();
	let values = [text];

	let patch = CompactContainersPatch::new().replace_values(&values);
	assert_eq!(
		CompactContainers::initialize(&mut bytes, &patch).unwrap(),
		bytes.len()
	);

	assert_eq!(bytes, [1, 0, 2, b'h', b'i', 0, 0]);
	let view = CompactContainers::read_prefix(&bytes).unwrap();
	assert_eq!(view.values()[0].as_str(), "hi");
}

#[test]
fn absent_options_do_not_expose_or_validate_inactive_payloads() {
	let bytes = [0, 255, 255, 255, 255, 255];
	let view = OptionalText::read_exact(&bytes).unwrap();

	assert!(view.value.get().is_none());
	assert!(view.value.get_ref().is_none());
	assert_eq!(format!("{:?}", view.value), "None");
}

#[test]
fn replacing_an_absent_payload_restores_a_valid_active_value() {
	let mut bytes = [0, 255, 255, 255, 255, 255];
	let mut text = PodString::<4>::default();
	text.try_set("ok").unwrap();

	{
		let view = OptionalText::read_exact_mut(&mut bytes).unwrap();
		view.value.set(Some(text));
		assert_eq!(view.value.get_ref().unwrap().as_str(), "ok");
	}

	assert_eq!(bytes, [1, 2, b'o', b'k', 0, 0]);
	let view = OptionalText::read_exact(&bytes).unwrap();
	assert_eq!(view.value.get_ref().unwrap().as_str(), "ok");
}

#[test]
fn active_options_still_reject_invalid_payloads() {
	let invalid_length = [1, 255, 255, 255, 255, 255];
	let invalid_utf8 = [1, 1, 255, 0, 0, 0];

	assert!(matches!(
		OptionalText::read_exact(&invalid_length),
		Err(PinaPodError::InvalidLength)
	));
	assert!(matches!(
		OptionalText::read_exact(&invalid_utf8),
		Err(PinaPodError::InvalidUtf8)
	));
}

#[test]
fn shortening_or_clearing_a_vector_zeroes_removed_values() {
	let mut bytes = [0; VectorBytes::SIZE];
	let values = &mut VectorBytes::read_exact_mut(&mut bytes).unwrap().values;
	values
		.try_set_from_slice(&[1u16.into(), 2u16.into(), 3u16.into(), 4u16.into()])
		.unwrap();
	values
		.try_set_from_slice(&[9u16.into(), 8u16.into()])
		.unwrap();
	assert_eq!(bytes, [2, 0, 9, 0, 8, 0, 0, 0, 0, 0]);

	let values = &mut VectorBytes::read_exact_mut(&mut bytes).unwrap().values;
	values.clear();
	assert_eq!(bytes, [0; 10]);
}

#[test]
fn shortening_or_clearing_a_string_zeroes_removed_bytes() {
	let mut bytes = [0; StringBytes::SIZE];
	let value = &mut StringBytes::read_exact_mut(&mut bytes).unwrap().value;
	value.try_set("private!").unwrap();
	value.try_set("ok").unwrap();
	assert_eq!(bytes, [2, b'o', b'k', 0, 0, 0, 0, 0, 0]);

	let value = &mut StringBytes::read_exact_mut(&mut bytes).unwrap().value;
	value.clear();
	assert_eq!(bytes, [0; 9]);
}