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use crate::debugger::variable::value::Value;
use std::collections::VecDeque;
#[derive(PartialEq, Debug)]
pub(super) enum FieldOrIndex<'a> {
Field(Option<&'a str>),
Index(i64),
Root,
}
/// Iterator for visits underline values in BFS order.
pub(super) struct BfsIterator<'a> {
pub(super) queue: VecDeque<(FieldOrIndex<'a>, &'a Value)>,
}
impl<'a> Iterator for BfsIterator<'a> {
type Item = (FieldOrIndex<'a>, &'a Value);
fn next(&mut self) -> Option<Self::Item> {
let (field_or_idx, next_value) = self.queue.pop_front()?;
match next_value {
Value::Struct(r#struct) => {
r#struct.members.iter().for_each(|member| {
let item = (
FieldOrIndex::Field(member.field_name.as_deref()),
&member.value,
);
self.queue.push_back(item)
});
}
Value::Array(array) => {
if let Some(items) = array.items.as_ref() {
items.iter().for_each(|item| {
let item = (FieldOrIndex::Index(item.index), &item.value);
self.queue.push_back(item)
})
}
}
Value::RustEnum(r#enum) => {
if let Some(enumerator) = r#enum.value.as_ref() {
let item = (
FieldOrIndex::Field(enumerator.field_name.as_deref()),
&enumerator.value,
);
self.queue.push_back(item)
}
}
Value::Pointer(_) => {}
Value::Specialized {
original: origin, ..
} => origin.members.iter().for_each(|member| {
let item = (
FieldOrIndex::Field(member.field_name.as_deref()),
&member.value,
);
self.queue.push_back(item)
}),
_ => {}
}
Some((field_or_idx, next_value))
}
}
#[cfg(test)]
mod test {
use super::*;
use crate::debugger::debugee::dwarf::r#type::TypeIdentity;
use crate::debugger::variable::value::{
ArrayItem, ArrayValue, Member, PointerValue, RustEnumValue, ScalarValue, StructValue,
};
#[test]
fn test_bfs_iterator() {
struct TestCase {
variable: Value,
expected_order: Vec<FieldOrIndex<'static>>,
}
let test_cases = vec![
TestCase {
variable: Value::Struct(StructValue {
type_ident: TypeIdentity::unknown(),
type_id: None,
members: vec![
Member {
field_name: Some("array_1".to_owned()),
value: Value::Array(ArrayValue {
type_id: None,
type_ident: TypeIdentity::unknown(),
items: Some(vec![
ArrayItem {
index: 1,
value: Value::Scalar(ScalarValue {
type_ident: TypeIdentity::unknown(),
value: None,
raw_address: None,
type_id: None,
}),
},
ArrayItem {
index: 2,
value: Value::Scalar(ScalarValue {
type_ident: TypeIdentity::unknown(),
value: None,
raw_address: None,
type_id: None,
}),
},
]),
raw_address: None,
}),
},
Member {
field_name: Some("array_2".to_owned()),
value: Value::Array(ArrayValue {
type_ident: TypeIdentity::unknown(),
type_id: None,
items: Some(vec![
ArrayItem {
index: 3,
value: Value::Scalar(ScalarValue {
type_ident: TypeIdentity::unknown(),
value: None,
raw_address: None,
type_id: None,
}),
},
ArrayItem {
index: 4,
value: Value::Scalar(ScalarValue {
type_ident: TypeIdentity::unknown(),
value: None,
raw_address: None,
type_id: None,
}),
},
]),
raw_address: None,
}),
},
],
type_params: Default::default(),
raw_address: None,
}),
expected_order: vec![
FieldOrIndex::Root,
FieldOrIndex::Field(Some("array_1")),
FieldOrIndex::Field(Some("array_2")),
FieldOrIndex::Index(1),
FieldOrIndex::Index(2),
FieldOrIndex::Index(3),
FieldOrIndex::Index(4),
],
},
TestCase {
variable: Value::Struct(StructValue {
type_id: None,
type_ident: TypeIdentity::unknown(),
members: vec![
Member {
field_name: Some("struct_2".to_owned()),
value: Value::Struct(StructValue {
type_id: None,
type_ident: TypeIdentity::unknown(),
members: vec![
Member {
field_name: Some("scalar_1".to_owned()),
value: Value::Scalar(ScalarValue {
type_id: None,
type_ident: TypeIdentity::unknown(),
value: None,
raw_address: None,
}),
},
Member {
field_name: Some("enum_1".to_owned()),
value: Value::RustEnum(RustEnumValue {
type_id: None,
type_ident: TypeIdentity::unknown(),
value: Some(Box::new(Member {
field_name: Some("scalar_2".to_owned()),
value: Value::Scalar(ScalarValue {
type_id: None,
type_ident: TypeIdentity::unknown(),
value: None,
raw_address: None,
}),
})),
raw_address: None,
}),
},
Member {
field_name: Some("scalar_3".to_owned()),
value: Value::Scalar(ScalarValue {
type_id: None,
type_ident: TypeIdentity::unknown(),
value: None,
raw_address: None,
}),
},
],
type_params: Default::default(),
raw_address: None,
}),
},
Member {
field_name: Some("pointer_1".to_owned()),
value: Value::Pointer(PointerValue {
type_id: None,
type_ident: TypeIdentity::unknown(),
value: None,
target_type: None,
target_type_size: None,
raw_address: None,
}),
},
],
type_params: Default::default(),
raw_address: None,
}),
expected_order: vec![
FieldOrIndex::Root,
FieldOrIndex::Field(Some("struct_2")),
FieldOrIndex::Field(Some("pointer_1")),
FieldOrIndex::Field(Some("scalar_1")),
FieldOrIndex::Field(Some("enum_1")),
FieldOrIndex::Field(Some("scalar_3")),
FieldOrIndex::Field(Some("scalar_2")),
],
},
];
for tc in test_cases {
let iter = tc.variable.bfs_iterator();
let names: Vec<_> = iter.map(|(field_or_idx, _)| field_or_idx).collect();
assert_eq!(tc.expected_order, names);
}
}
}