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use crate::{CombineOperation, Operation, WireValue};
/**
Defines iterators for getting the inputs and outputs of a gate. Works for both CombineOperation and Operation
*/
pub struct InputIterator<'a, T> {
op: &'a T,
index: usize,
}
impl<'a, T> InputIterator<'a, T> {
pub(crate) fn new(op: &'a T) -> Self {
InputIterator { op, index: 0 }
}
}
pub struct OutputIterator<'a, T> {
op: &'a T,
index: usize,
}
impl<'a, T> OutputIterator<'a, T> {
pub(crate) fn new(op: &'a T) -> Self {
OutputIterator { op, index: 0 }
}
}
impl<'a, T: WireValue> Iterator for InputIterator<'a, Operation<T>> {
type Item = usize;
fn next(&mut self) -> Option<Self::Item> {
let res = match *self.op {
Operation::Input(_) => None,
Operation::Random(_) => None,
Operation::Sub(_, a, b) => {
if self.index == 0 {
Some(a)
} else if self.index == 1 {
Some(b)
} else {
None
}
}
Operation::SubConst(_, a, _) => {
if self.index == 0 {
Some(a)
} else {
None
}
}
Operation::Add(_, a, b) => {
if self.index == 0 {
Some(a)
} else if self.index == 1 {
Some(b)
} else {
None
}
}
Operation::AddConst(_, a, _) => {
if self.index == 0 {
Some(a)
} else {
None
}
}
Operation::Mul(_, a, b) => {
if self.index == 0 {
Some(a)
} else if self.index == 1 {
Some(b)
} else {
None
}
}
Operation::MulConst(_, a, _) => {
if self.index == 0 {
Some(a)
} else {
None
}
}
Operation::AssertZero(a) => {
if self.index == 0 {
Some(a)
} else {
None
}
}
Operation::Const(_, _) => None,
};
self.index += 1;
res
}
}
impl<'a, T: WireValue> Iterator for OutputIterator<'a, Operation<T>> {
type Item = usize;
fn next(&mut self) -> Option<Self::Item> {
let res = match *self.op {
Operation::Input(a) => {
if self.index == 0 {
Some(a)
} else {
None
}
}
Operation::Random(a) => {
if self.index == 0 {
Some(a)
} else {
None
}
}
Operation::Sub(a, _, _) => {
if self.index == 0 {
Some(a)
} else {
None
}
}
Operation::SubConst(a, _, _) => {
if self.index == 0 {
Some(a)
} else {
None
}
}
Operation::Add(a, _, _) => {
if self.index == 0 {
Some(a)
} else {
None
}
}
Operation::AddConst(a, _, _) => {
if self.index == 0 {
Some(a)
} else {
None
}
}
Operation::Mul(a, _, _) => {
if self.index == 0 {
Some(a)
} else {
None
}
}
Operation::MulConst(a, _, _) => {
if self.index == 0 {
Some(a)
} else {
None
}
}
Operation::AssertZero(_) => None,
Operation::Const(a, _) => {
if self.index == 0 {
Some(a)
} else {
None
}
}
};
self.index += 1;
res
}
}
impl<'a> Iterator for InputIterator<'a, CombineOperation> {
type Item = usize;
fn next(&mut self) -> Option<Self::Item> {
let res = match self.op {
CombineOperation::GF2(op) => InputIterator::new(op).nth(self.index),
CombineOperation::Z64(op) => InputIterator::new(op).nth(self.index),
CombineOperation::B2A(_, base) => {
if self.index < 64 {
Some(base + self.index)
} else {
None
}
}
CombineOperation::SizeHint(_, _) => None,
};
self.index += 1;
res
}
}
impl<'a> Iterator for OutputIterator<'a, CombineOperation> {
type Item = usize;
fn next(&mut self) -> Option<Self::Item> {
let res = match self.op {
CombineOperation::GF2(op) => OutputIterator::new(op).nth(self.index),
CombineOperation::Z64(op) => OutputIterator::new(op).nth(self.index),
CombineOperation::B2A(a, _) => {
if self.index == 0 {
Some(*a)
} else {
None
}
}
CombineOperation::SizeHint(_, _) => None,
};
self.index += 1;
res
}
}