use super::{call_args, custom, function, list, panic_expr, tuple};
use crate::plan::execution::lowering::graph::{DraftCursor, DraftFlow, DraftGraph, DraftNil};
use crate::plan::execution::lowering::specialization::{Representability, StoredValueShape};
use crate::plan::{execution, module};
pub(in crate::plan::execution::lowering) fn nil_expr(
expression: &module::NilExpr,
cursor: DraftCursor,
graph: &mut DraftGraph,
context: &mut super::super::LoweringContext,
) -> Representability<DraftFlow<DraftNil>> {
use super::super::instruction::DraftNilInstruction as I;
use module::NilExprKind as E;
match expression.kind() {
E::Value => {
let mut cursor = cursor;
let value = graph.nil_instruction(&mut cursor, I::Value);
Representability::Inhabited(DraftFlow::value(cursor, value))
}
E::Constant(reference) => context.nil_constant(reference).map(|id| {
let mut cursor = cursor;
let value = graph.nil_instruction(
&mut cursor,
I::Constant(execution::constant::ConstantId::new(id.index())),
);
DraftFlow::value(cursor, value)
}),
E::LocalGet { local, name: _ } => {
let value = cursor.scope().nil(super::super::local::LocalKey::new(
super::super::local::LocalKind::Nil,
local.0,
));
Representability::Inhabited(DraftFlow::value(cursor, value))
}
E::Call {
function,
args,
site,
} => call_args(args, cursor, graph, context).and_then(|flow| match flow {
DraftFlow::Diverged => Representability::Inhabited(DraftFlow::Diverged),
DraftFlow::Value {
mut cursor,
value: args,
} => context.nil_function_id(function).map(|function| {
let value = graph.nil_instruction(
&mut cursor,
I::Call {
function,
args,
site: site.clone(),
},
);
DraftFlow::value(cursor, value)
}),
}),
E::FunctionCall {
function: value,
args,
site,
} => {
function::nil_function_expr(value, cursor, graph, context).and_then(|flow| match flow {
DraftFlow::Diverged => Representability::Inhabited(DraftFlow::Diverged),
DraftFlow::Value {
cursor,
value: function,
} => call_args(args, cursor, graph, context).map(|flow| match flow {
DraftFlow::Diverged => DraftFlow::Diverged,
DraftFlow::Value {
mut cursor,
value: args,
} => {
let value = graph.nil_instruction(
&mut cursor,
I::FunctionCall {
function: function.value().clone(),
args,
site: site.clone(),
},
);
DraftFlow::value(cursor, value)
}
}),
})
}
E::TupleIndex {
tuple: value,
index,
} => tuple::tuple_expr(value, cursor, graph, context).map(|flow| match flow {
DraftFlow::Diverged => DraftFlow::Diverged,
DraftFlow::Value {
mut cursor,
value: tuple,
} => {
let value = graph.nil_instruction(
&mut cursor,
I::TupleIndex {
tuple,
index: *index,
},
);
DraftFlow::value(cursor, value)
}
}),
E::CustomField(access) => {
custom::custom_expr(access.source(), cursor, graph, context).map(|flow| match flow {
DraftFlow::Diverged => DraftFlow::Diverged,
DraftFlow::Value {
mut cursor,
value: source,
} => {
let value = graph.nil_instruction(
&mut cursor,
I::CustomField {
source,
index: access.index(),
},
);
DraftFlow::value(cursor, value)
}
})
}
E::ListIndex { list: value, index } => list::nil_list_expr(value, cursor, graph, context)
.map(|flow| match flow {
DraftFlow::Diverged => DraftFlow::Diverged,
DraftFlow::Value {
mut cursor,
value: list,
} => {
let value = graph.nil_instruction(
&mut cursor,
I::ListIndex {
list: list.value().clone(),
index: *index,
},
);
DraftFlow::value(cursor, value)
}
}),
E::Panic(value) => panic_expr(value, cursor, graph, context).map(|_| DraftFlow::Diverged),
E::BoolCase {
subject,
true_,
false_,
} => super::bool_case(
subject,
cursor,
super::case_lowering(graph, context, StoredValueShape::Nil),
|cursor, graph, context| nil_expr(true_, cursor, graph, context),
|cursor, graph, context| nil_expr(false_, cursor, graph, context),
DraftNil::from_ref,
),
E::IntCase {
subject,
clauses,
fallback,
} => super::int_case(
subject,
clauses,
fallback,
cursor,
super::case_lowering(graph, context, StoredValueShape::Nil),
nil_expr,
DraftNil::from_ref,
),
E::StringCase {
subject,
clauses,
fallback,
} => super::string_case(
subject,
clauses,
fallback,
cursor,
super::case_lowering(graph, context, StoredValueShape::Nil),
nil_expr,
DraftNil::from_ref,
),
E::FloatCase {
subject,
clauses,
fallback,
} => super::float_case(
subject,
clauses,
fallback,
cursor,
super::case_lowering(graph, context, StoredValueShape::Nil),
nil_expr,
DraftNil::from_ref,
),
E::Block { steps, return_ } => super::super::step::steps(steps, cursor, graph, context)
.and_then(|flow| match flow {
DraftFlow::Diverged => Representability::Inhabited(DraftFlow::Diverged),
DraftFlow::Value { cursor, value: () } => nil_expr(return_, cursor, graph, context),
}),
}
}