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use std::rc::Rc;
use std::sync::Arc;
use mago_codex::ttype::TType;
use mago_codex::ttype::atomic::TAtomic;
use mago_codex::ttype::atomic::array::TArray;
use mago_codex::ttype::atomic::array::key::ArrayKey;
use mago_codex::ttype::atomic::array::keyed::TKeyedArray;
use mago_codex::ttype::atomic::array::list::TList;
use mago_codex::ttype::get_int;
use mago_codex::ttype::union::TUnion;
use mago_reporting::Annotation;
use mago_reporting::Issue;
use mago_span::HasSpan;
use mago_syntax::ast::Expression;
use mago_syntax::ast::Unset;
use crate::analyzable::Analyzable;
use crate::artifacts::AnalysisArtifacts;
use crate::code::IssueCode;
use crate::context::Context;
use crate::context::block::BlockContext;
use crate::error::AnalysisError;
use crate::utils::expression::get_expression_id;
impl<'ast, 'arena> Analyzable<'ast, 'arena> for Unset<'arena> {
fn analyze<'ctx>(
&'ast self,
context: &mut Context<'ctx, 'arena>,
block_context: &mut BlockContext<'ctx>,
artifacts: &mut AnalysisArtifacts,
) -> Result<(), AnalysisError> {
let was_inside_unset = block_context.flags.inside_unset();
block_context.flags.set_inside_unset(true);
for value in &self.values {
let was_inside_general_use = block_context.flags.inside_general_use();
block_context.flags.set_inside_general_use(true);
value.analyze(context, block_context, artifacts)?;
block_context.flags.set_inside_general_use(was_inside_general_use);
let value_id = get_expression_id(
value,
block_context.scope.get_class_like_name(),
context.resolved_names,
Some(context.codebase),
);
if let Some(value_id) = &value_id {
block_context.remove_variable(value_id, true, context);
block_context.references_possibly_from_confusing_scope.remove(value_id);
}
'array_access: {
let Expression::ArrayAccess(array_access) = value else {
break 'array_access;
};
let Some(array_id) = get_expression_id(
array_access.array,
block_context.scope.get_class_like_name(),
context.resolved_names,
Some(context.codebase),
) else {
break 'array_access;
};
let Some(key_type) = artifacts.get_expression_type(array_access.index) else {
break 'array_access;
};
let Some(array_variable) = block_context.locals.remove(&array_id) else {
break 'array_access;
};
let mut atomics = vec![];
let array_key = key_type.get_single_array_key();
for atomic in Rc::unwrap_or_clone(array_variable).types.into_owned() {
if let TAtomic::Scalar(scalar) = &atomic {
let scalar_str = scalar.get_id();
context.collector.report_with_code(
IssueCode::InvalidUnset,
Issue::error(format!(
"Cannot apply `unset` to an offset of non-array type `{scalar_str}`."
))
.with_annotation(
Annotation::primary(array_access.array.span())
.with_message(format!("This has type `{scalar_str}`, not an array."))
)
.with_annotation(
Annotation::secondary(self.unset.span)
.with_message("`unset` used here on a non-array type.")
)
.with_note(
"`unset` on an array offset requires the base variable to be an array or an object that implements `ArrayAccess`."
)
.with_note(
format!("Using `unset` on an offset of type `{scalar_str}` will cause a runtime error.")
)
.with_help(
"Ensure the variable is an array before attempting to unset an element."
),
);
atomics.push(atomic);
continue;
}
let TAtomic::Array(array) = atomic else {
atomics.push(atomic);
continue;
};
match array {
TArray::List(array) => {
let TList { element_type, known_elements, known_count, non_empty } = array;
let Some(mut known_elements) = known_elements else {
atomics.push(TAtomic::Array(TArray::Keyed(TKeyedArray {
known_items: None,
parameters: Some((Arc::new(get_int()), element_type)),
non_empty: if let Some(known_count) = known_count {
known_count > 1 // we removed 1, so we are non-empty if we had more than 1
} else {
false
},
})));
continue;
};
let Some(ArrayKey::Integer(target_index)) = &array_key else {
if array_key.is_none() {
atomics.push(TAtomic::Array(TArray::List(TList {
known_elements: Some(
// We don't know the key value, so we can't unset it.
// Mark all items as potentially undefined.
known_elements
.into_iter()
.map(|(index, mut element)| {
// Mark the item as potentially undefined.
element.0 = true;
(index, element)
})
.collect(),
),
element_type,
known_count,
// Mark the list as potentially undefined.
non_empty: true,
})));
} else {
// Keep everything as is, attempting to remove a string key from a list
// makes no sense.
// An error will be emitted when we are analyzing the expression above, so ignore it here.
atomics.push(TAtomic::Array(TArray::List(TList {
known_elements: Some(known_elements),
element_type,
known_count,
non_empty,
})));
}
continue;
};
let is_fixed_list = element_type.is_never();
let maintain_list = is_fixed_list && {
let elements_count = known_elements.len();
let last_index = elements_count - 1;
*target_index == (last_index as i64)
};
let mut element_removed = false;
known_elements.retain(|index, _| {
if *target_index < 0 {
// this is a negative index, which means we can't remove it
// from the list
true
} else {
let index = *index as i64;
if index == *target_index {
element_removed = true;
false
} else {
true
}
}
});
if !element_removed {
atomics.push(TAtomic::Array(TArray::List(TList {
known_elements: Some(known_elements),
element_type,
known_count,
non_empty,
})));
continue;
}
let non_empty = !known_elements.is_empty();
let known_count = Some(known_elements.len());
let known_elements = if known_elements.is_empty() {
// Completely empty now.
None
} else {
Some(known_elements)
};
if maintain_list {
atomics.push(TAtomic::Array(TArray::List(TList {
known_count,
non_empty,
known_elements,
element_type,
})));
} else {
// we removed an integer index from a list such as:
// `list{1, 2, 3, ...<int>}`, which means the keys are no longer sequential.
// this makes the list no longer a list array, but rather a keyed array.
// we need to convert the list into a keyed array.
atomics.push(TAtomic::Array(TArray::Keyed(TKeyedArray {
known_items: known_elements.map(|known_elements| {
known_elements
.into_iter()
.map(|(index, element)| (ArrayKey::Integer(index as i64), element))
.collect()
}),
parameters: if element_type.is_never() {
None
} else {
Some((Arc::new(get_int()), element_type))
},
non_empty,
})));
}
}
TArray::Keyed(array) => {
let TKeyedArray { known_items, parameters, non_empty } = array;
let Some(mut known_items) = known_items else {
atomics.push(TAtomic::Array(TArray::Keyed(TKeyedArray {
known_items: None,
parameters,
// We don't have any known items, so we can't unset anything.
// Mark the keyed array as potentially empty.
non_empty: false,
})));
continue;
};
let Some(array_key) = &array_key else {
atomics.push(TAtomic::Array(TArray::Keyed(TKeyedArray {
known_items: Some(
// We don't know the key value, so we can't unset it.
// Mark all items as potentially undefined.
known_items
.into_iter()
.map(|(key, mut item)| {
// Mark the item as potentially undefined.
item.0 = true;
(key, item)
})
.collect(),
),
parameters,
non_empty,
})));
continue;
};
let Some(_) = known_items.remove(array_key) else {
atomics.push(TAtomic::Array(TArray::Keyed(TKeyedArray {
known_items: Some(known_items),
parameters,
non_empty,
})));
continue;
};
let (known_items, non_empty) = if known_items.is_empty() {
// Completely empty now.
(None, false)
} else {
(Some(known_items), true)
};
atomics.push(TAtomic::Array(TArray::Keyed(TKeyedArray {
known_items,
parameters,
non_empty,
})));
}
}
}
let rc = Rc::new(TUnion::from_vec(atomics));
block_context.locals.insert(array_id, Rc::clone(&rc));
block_context.remove_variable_from_conflicting_clauses(context, array_id, Some(rc.as_ref()));
};
}
block_context.flags.set_inside_unset(was_inside_unset);
Ok(())
}
}