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splitup record decoder
This commit is contained in:
faldor20
parent
17599ec911
commit
46122262ff
4 changed files with 1104 additions and 1020 deletions
File diff suppressed because it is too large
Load diff
126
crates/compiler/derive/src/decoding/record/decodeWith.rs
Normal file
126
crates/compiler/derive/src/decoding/record/decodeWith.rs
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@ -0,0 +1,126 @@
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use roc_can::expr::{
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AnnotatedMark, ClosureData, Expr, Field, Recursive, WhenBranch, WhenBranchPattern,
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};
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use roc_can::pattern::Pattern;
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use roc_collections::SendMap;
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use roc_module::called_via::CalledVia;
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use roc_module::ident::Lowercase;
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use roc_module::symbol::Symbol;
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use roc_region::all::{Loc, Region};
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use roc_types::subs::{
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Content, ExhaustiveMark, FlatType, LambdaSet, OptVariable, RecordFields, RedundantMark,
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SubsSlice, TagExt, UnionLambdas, UnionTags, Variable,
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};
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use roc_types::types::RecordField;
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use crate::synth_var;
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use crate::util::{empty_list, ok_to_ok_branch, Env, ExtensionKind};
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use super::wrap_in_decode_custom_decode_with;
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/// Makes the vars for decoding this particular field and decode format
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fn make_decode_with_vars(
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env: &mut Env<'_>,
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field_var: Variable,
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bytes_arg_var: Variable,
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fmt_arg_var: Variable,
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decode_err_var: Variable,
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) -> (Variable, Variable, Variable, Variable, Variable) {
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// rec.result : [Ok field_var, Err DecodeError]
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let rec_dot_result = {
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let tag_union = FlatType::TagUnion(
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UnionTags::for_result(env.subs, field_var, decode_err_var),
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TagExt::Any(Variable::EMPTY_TAG_UNION),
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);
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synth_var(env.subs, Content::Structure(tag_union))
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};
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// rec : { rest: List U8, result: (typeof rec.result) }
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let rec_var = {
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let fields = RecordFields::insert_into_subs(
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env.subs,
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[
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("rest".into(), RecordField::Required(Variable::LIST_U8)),
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("result".into(), RecordField::Required(rec_dot_result)),
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],
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);
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let record = FlatType::Record(fields, Variable::EMPTY_RECORD);
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synth_var(env.subs, Content::Structure(record))
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};
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// `Decode.decoder` for the field's value
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let decoder_var = env.import_builtin_symbol_var(Symbol::DECODE_DECODER);
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let decode_with_var = env.import_builtin_symbol_var(Symbol::DECODE_DECODE_WITH);
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let lambda_set_var = env.subs.fresh_unnamed_flex_var();
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let this_decode_with_var = {
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let subs_slice =
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SubsSlice::insert_into_subs(env.subs, [bytes_arg_var, decoder_var, fmt_arg_var]);
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let this_decode_with_var = synth_var(
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env.subs,
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Content::Structure(FlatType::Func(subs_slice, lambda_set_var, rec_var)),
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);
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env.unify(decode_with_var, this_decode_with_var);
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this_decode_with_var
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};
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(
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rec_var,
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rec_dot_result,
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decoder_var,
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lambda_set_var,
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this_decode_with_var,
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)
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}
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/// `Decode.decodeWith bytes Decode.decoder fmt`
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///
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/// Generates a call to decodeWith, returns that expression,
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/// the variable of the return value `{ rest: List U8, result: (typeof rec.result) }`,
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/// and the variable of the result field of the return value `[Ok field_var, Err DecodeError]`
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pub(super) fn decode_with(
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env: &mut Env<'_>,
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field_var: Variable,
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bytes_arg_expr: Expr,
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fmt_arg_var: Variable,
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fmt_arg_symbol: Symbol,
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decode_err_var: Variable,
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) -> (Expr, Variable, Variable) {
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// Creates all the vars we need to call decode_with for the specific field and fmt we are going to call it with
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let (decode_rec_var, decode_rec_dot_result, decoder_var, lambda_set_var, this_decode_with_var) =
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make_decode_with_vars(
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env,
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field_var,
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Variable::LIST_U8,
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fmt_arg_var,
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decode_err_var,
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);
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let decode_expr = Expr::Call(
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Box::new((
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this_decode_with_var,
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Loc::at_zero(Expr::Var(Symbol::DECODE_DECODE_WITH, this_decode_with_var)),
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lambda_set_var,
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decode_rec_var,
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)),
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vec![
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(Variable::LIST_U8, Loc::at_zero(bytes_arg_expr)),
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(
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decoder_var,
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Loc::at_zero(Expr::AbilityMember(
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Symbol::DECODE_DECODER,
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None,
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decoder_var,
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)),
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),
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(
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fmt_arg_var,
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Loc::at_zero(Expr::Var(fmt_arg_symbol, fmt_arg_var)),
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),
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],
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CalledVia::Space,
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);
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(decode_expr, decode_rec_var, decode_rec_dot_result)
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}
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320
crates/compiler/derive/src/decoding/record/finalizer.rs
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320
crates/compiler/derive/src/decoding/record/finalizer.rs
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@ -0,0 +1,320 @@
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use roc_can::expr::{
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AnnotatedMark, ClosureData, Expr, Field, Recursive, WhenBranch, WhenBranchPattern,
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};
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use roc_can::pattern::Pattern;
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use roc_collections::SendMap;
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use roc_module::called_via::CalledVia;
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use roc_module::ident::Lowercase;
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use roc_module::symbol::Symbol;
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use roc_region::all::{Loc, Region};
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use roc_types::subs::{
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Content, ExhaustiveMark, FlatType, LambdaSet, OptVariable, RecordFields, RedundantMark,
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SubsSlice, TagExt, UnionLambdas, UnionTags, Variable,
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};
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use roc_types::types::RecordField;
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use crate::synth_var;
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use crate::util::{empty_list, ok_to_ok_branch, Env, ExtensionKind};
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use super::decodeWith::decode_with;
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use super::wrap_in_decode_custom_decode_with;
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// Example:
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// finalizer = \rec ->
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// when rec.first is
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// Ok first ->
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// when rec.second is
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// Ok second -> Ok {first, second}
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// Err NoField -> Err TooShort
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// Err NoField -> Err TooShort
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//THis is my new one
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pub(super) fn finalizer(
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env: &mut Env,
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state_record_var: Variable,
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fields: &[Lowercase],
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field_vars: &[Variable],
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result_field_vars: &[Variable],
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) -> (Expr, Variable, Variable) {
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let state_arg_symbol = env.new_symbol("stateRecord");
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let mut fields_map = SendMap::default();
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let mut pattern_symbols = Vec::with_capacity(fields.len());
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let decode_err_var = {
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let flat_type = FlatType::TagUnion(
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UnionTags::tag_without_arguments(env.subs, "TooShort".into()),
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TagExt::Any(Variable::EMPTY_TAG_UNION),
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);
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synth_var(env.subs, Content::Structure(flat_type))
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};
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for (field_name, &field_var) in fields.iter().zip(field_vars.iter()) {
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let symbol = env.new_symbol(field_name.as_str());
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pattern_symbols.push(symbol);
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let field_expr = Expr::Var(symbol, field_var);
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let field = Field {
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var: field_var,
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region: Region::zero(),
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loc_expr: Box::new(Loc::at_zero(field_expr)),
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};
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fields_map.insert(field_name.clone(), field);
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}
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// The bottom of the happy path - return the decoded record {first: a, second: b} wrapped with
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// "Ok".
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let return_type_var;
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let mut body = {
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let subs = &mut env.subs;
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let record_field_iter = fields
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.iter()
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.zip(field_vars.iter())
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.map(|(field_name, &field_var)| (field_name.clone(), RecordField::Required(field_var)));
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let flat_type = FlatType::Record(
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RecordFields::insert_into_subs(subs, record_field_iter),
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Variable::EMPTY_RECORD,
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);
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let done_record_var = synth_var(subs, Content::Structure(flat_type));
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let done_record = Expr::Record {
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record_var: done_record_var,
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fields: fields_map,
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};
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return_type_var = {
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let flat_type = FlatType::TagUnion(
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UnionTags::for_result(subs, done_record_var, decode_err_var),
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TagExt::Any(Variable::EMPTY_TAG_UNION),
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);
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synth_var(subs, Content::Structure(flat_type))
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};
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Expr::Tag {
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tag_union_var: return_type_var,
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ext_var: env.new_ext_var(ExtensionKind::TagUnion),
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name: "Ok".into(),
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arguments: vec![(done_record_var, Loc::at_zero(done_record))],
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}
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};
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let fmt_arg_symbol = env.new_symbol("fmt");
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let fmt_arg_var = env.subs.fresh_unnamed_flex_var();
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// Unwrap each result in the decoded state
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//
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// when rec.first is
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// Ok first -> ...happy path...
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// Err NoField -> Err TooShort
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for (((symbol, field_name), &field_var), &result_field_var) in pattern_symbols
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.iter()
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.rev()
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.zip(fields.iter().rev())
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.zip(field_vars.iter().rev())
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.zip(result_field_vars.iter().rev())
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{
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let cond_expr = attempt_empty_decode_if_missing(
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state_record_var,
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env,
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field_var,
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result_field_var,
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state_arg_symbol,
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field_name,
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fmt_arg_var,
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fmt_arg_symbol,
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decode_err_var,
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symbol,
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);
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// Example: `Ok x -> expr`
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let ok_branch = WhenBranch {
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patterns: vec![WhenBranchPattern {
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pattern: Loc::at_zero(Pattern::AppliedTag {
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whole_var: result_field_var,
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ext_var: Variable::EMPTY_TAG_UNION,
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tag_name: "Ok".into(),
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arguments: vec![(field_var, Loc::at_zero(Pattern::Identifier(*symbol)))],
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}),
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degenerate: false,
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}],
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value: Loc::at_zero(body),
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guard: None,
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redundant: RedundantMark::known_non_redundant(),
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};
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// Example: `_ -> Err TooShort`
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let err_branch = WhenBranch {
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patterns: vec![WhenBranchPattern {
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pattern: Loc::at_zero(Pattern::Underscore),
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degenerate: false,
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}],
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value: Loc::at_zero(Expr::Tag {
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tag_union_var: return_type_var,
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ext_var: env.new_ext_var(ExtensionKind::TagUnion),
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name: "Err".into(),
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arguments: vec![(
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decode_err_var,
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Loc::at_zero(Expr::Tag {
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tag_union_var: decode_err_var,
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ext_var: Variable::EMPTY_TAG_UNION,
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name: "TooShort".into(),
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arguments: Vec::new(),
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}),
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)],
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}),
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guard: None,
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redundant: RedundantMark::known_non_redundant(),
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};
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body = Expr::When {
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loc_cond: Box::new(Loc::at_zero(cond_expr)),
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cond_var: result_field_var,
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expr_var: return_type_var,
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region: Region::zero(),
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branches: vec![ok_branch, err_branch],
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branches_cond_var: result_field_var,
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exhaustive: ExhaustiveMark::known_exhaustive(),
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};
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}
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let function_var = synth_var(env.subs, Content::Error); // We'll fix this up in subs later.
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let function_symbol = env.new_symbol("finalizer");
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let lambda_set = LambdaSet {
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solved: UnionLambdas::tag_without_arguments(env.subs, function_symbol),
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recursion_var: OptVariable::NONE,
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unspecialized: Default::default(),
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ambient_function: function_var,
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};
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let closure_type = synth_var(env.subs, Content::LambdaSet(lambda_set));
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let flat_type = FlatType::Func(
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SubsSlice::insert_into_subs(env.subs, [state_record_var, fmt_arg_var]),
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closure_type,
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return_type_var,
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);
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// Fix up function_var so it's not Content::Error anymore
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env.subs
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.set_content(function_var, Content::Structure(flat_type));
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let finalizer = Expr::Closure(ClosureData {
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function_type: function_var,
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closure_type,
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return_type: return_type_var,
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name: function_symbol,
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captured_symbols: Vec::new(),
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recursive: Recursive::NotRecursive,
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arguments: vec![
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(
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state_record_var,
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AnnotatedMark::known_exhaustive(),
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Loc::at_zero(Pattern::Identifier(state_arg_symbol)),
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),
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(
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fmt_arg_var,
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AnnotatedMark::known_exhaustive(),
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Loc::at_zero(Pattern::Identifier(fmt_arg_symbol)),
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),
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],
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loc_body: Box::new(Loc::at_zero(body)),
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});
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(finalizer, function_var, decode_err_var)
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}
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/// ```roc
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/// when rec.f0 is
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/// Err _ ->
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/// when Decode.decodeWith [] Decode.decoder fmt is
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/// rec2 -> rec2.result
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/// Ok a -> Ok a
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/// ```
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/// Tries to decode the field with a zero byte input if it missing,
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/// this allows the decoder to decode types that have a state for "missing", such as
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/// an "Option" type.
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///
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/// field_var: The variable of the field in the state record: `Result var NoField`
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/// result_field_var: The variable of the actual field
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fn attempt_empty_decode_if_missing(
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state_record_var: Variable,
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env: &mut Env<'_>,
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field_var: Variable,
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result_field_var: Variable,
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state_arg_symbol: Symbol,
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field_name: &Lowercase,
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fmt_arg_var: Variable,
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fmt_arg_symbol: Symbol,
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decode_err_var: Variable,
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symbol: &Symbol,
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) -> Expr {
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let decode_when = {
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let (decode_expr, rec_result, rec_dot_result) = decode_with(
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env,
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field_var,
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empty_list(Variable::U8),
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fmt_arg_var,
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fmt_arg_symbol,
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decode_err_var,
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);
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let decoder_rec_symb = env.new_symbol("decRec");
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let branch = WhenBranch {
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patterns: vec![WhenBranchPattern {
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pattern: Loc::at_zero(Pattern::Identifier(decoder_rec_symb)),
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degenerate: false,
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}],
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value: Loc::at_zero(Expr::RecordAccess {
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record_var: rec_result,
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ext_var: env.new_ext_var(ExtensionKind::Record),
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field_var: rec_dot_result,
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loc_expr: Box::new(Loc::at_zero(Expr::Var(decoder_rec_symb, rec_result))),
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field: "result".into(),
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}),
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guard: None,
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redundant: RedundantMark::known_non_redundant(),
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};
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// when Decode.decodeWith bytes Decode.decoder fmt is
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Expr::When {
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loc_cond: Box::new(Loc::at_zero(decode_expr)),
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cond_var: rec_result,
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expr_var: rec_dot_result,
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region: Region::zero(),
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branches: vec![branch],
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branches_cond_var: rec_result,
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exhaustive: ExhaustiveMark::known_exhaustive(),
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}
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};
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// when rec.first is
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let cond_expr = Expr::RecordAccess {
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record_var: state_record_var,
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ext_var: env.new_ext_var(ExtensionKind::Record),
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field_var: result_field_var,
|
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loc_expr: Box::new(Loc::at_zero(Expr::Var(state_arg_symbol, state_record_var))),
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field: field_name.clone(),
|
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};
|
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|
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// Example: `Ok x -> Ok x`
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let ok_branch = ok_to_ok_branch(result_field_var, result_field_var, field_var, symbol, env);
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|
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// Example: `_ -> Decode.partial [] Decode.decoder fmt `
|
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let err_branch = WhenBranch {
|
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patterns: vec![WhenBranchPattern {
|
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pattern: Loc::at_zero(Pattern::Underscore),
|
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degenerate: false,
|
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}],
|
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value: Loc::at_zero(decode_when),
|
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guard: None,
|
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redundant: RedundantMark::known_non_redundant(),
|
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};
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|
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Expr::When {
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loc_cond: Box::new(Loc::at_zero(cond_expr)),
|
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cond_var: result_field_var,
|
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expr_var: result_field_var,
|
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region: Region::zero(),
|
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branches: vec![ok_branch, err_branch],
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branches_cond_var: result_field_var,
|
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exhaustive: ExhaustiveMark::known_exhaustive(),
|
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}
|
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}
|
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651
crates/compiler/derive/src/decoding/record/stepField.rs
Normal file
651
crates/compiler/derive/src/decoding/record/stepField.rs
Normal file
|
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@ -0,0 +1,651 @@
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use roc_can::expr::{
|
||||
AnnotatedMark, ClosureData, Expr, Field, Recursive, WhenBranch, WhenBranchPattern,
|
||||
};
|
||||
use roc_can::pattern::Pattern;
|
||||
use roc_collections::SendMap;
|
||||
use roc_module::called_via::CalledVia;
|
||||
use roc_module::ident::Lowercase;
|
||||
use roc_module::symbol::Symbol;
|
||||
use roc_region::all::{Loc, Region};
|
||||
use roc_types::subs::{
|
||||
Content, ExhaustiveMark, FlatType, LambdaSet, OptVariable, RecordFields, RedundantMark,
|
||||
SubsSlice, TagExt, UnionLambdas, UnionTags, Variable,
|
||||
};
|
||||
use roc_types::types::RecordField;
|
||||
|
||||
use crate::synth_var;
|
||||
use crate::util::{empty_list, ok_to_ok_branch, Env, ExtensionKind};
|
||||
|
||||
use super::decodeWith::decode_with;
|
||||
use super::wrap_in_decode_custom_decode_with;
|
||||
// Example:
|
||||
// stepField = \state, field ->
|
||||
// when field is
|
||||
// "first" ->
|
||||
// Keep (Decode.custom \bytes, fmt ->
|
||||
// # Uses a single-branch `when` because `let` is more expensive to monomorphize
|
||||
// # due to checks for polymorphic expressions, and `rec` would be polymorphic.
|
||||
// when Decode.decodeWith bytes Decode.decoder fmt is
|
||||
// rec ->
|
||||
// {
|
||||
// rest: rec.rest,
|
||||
// result: when rec.result is
|
||||
// Ok val -> Ok {state & first: Ok val},
|
||||
// Err err -> Err err
|
||||
// })
|
||||
//
|
||||
// "second" ->
|
||||
// Keep (Decode.custom \bytes, fmt ->
|
||||
// when Decode.decodeWith bytes Decode.decoder fmt is
|
||||
// rec ->
|
||||
// {
|
||||
// rest: rec.rest,
|
||||
// result: when rec.result is
|
||||
// Ok val -> Ok {state & second: Ok val},
|
||||
// Err err -> Err err
|
||||
// })
|
||||
//
|
||||
// _ -> Skip
|
||||
pub(super) fn step_field(
|
||||
env: &mut Env,
|
||||
fields: Vec<Lowercase>,
|
||||
field_vars: &[Variable],
|
||||
result_field_vars: &[Variable],
|
||||
state_record_var: Variable,
|
||||
decode_err_var: Variable,
|
||||
) -> (Expr, Variable) {
|
||||
let state_arg_symbol = env.new_symbol("stateRecord");
|
||||
let field_arg_symbol = env.new_symbol("field");
|
||||
|
||||
// +1 because of the default branch.
|
||||
let mut branches = Vec::with_capacity(fields.len() + 1);
|
||||
let keep_payload_var = env.subs.fresh_unnamed_flex_var();
|
||||
let keep_or_skip_var = {
|
||||
let keep_payload_subs_slice = SubsSlice::insert_into_subs(env.subs, [keep_payload_var]);
|
||||
let flat_type = FlatType::TagUnion(
|
||||
UnionTags::insert_slices_into_subs(
|
||||
env.subs,
|
||||
[
|
||||
("Keep".into(), keep_payload_subs_slice),
|
||||
("Skip".into(), Default::default()),
|
||||
],
|
||||
),
|
||||
TagExt::Any(Variable::EMPTY_TAG_UNION),
|
||||
);
|
||||
|
||||
synth_var(env.subs, Content::Structure(flat_type))
|
||||
};
|
||||
|
||||
for ((field_name, &field_var), &result_field_var) in fields
|
||||
.into_iter()
|
||||
.zip(field_vars.iter())
|
||||
.zip(result_field_vars.iter())
|
||||
{
|
||||
// Example:
|
||||
// "first" ->
|
||||
// Keep (Decode.custom \bytes, fmt ->
|
||||
// # Uses a single-branch `when` because `let` is more expensive to monomorphize
|
||||
// # due to checks for polymorphic expressions, and `rec` would be polymorphic.
|
||||
// when Decode.decodeWith bytes Decode.decoder fmt is
|
||||
// rec ->
|
||||
// {
|
||||
// rest: rec.rest,
|
||||
// result: when rec.result is
|
||||
// Ok val -> Ok {state & first: Ok val},
|
||||
// Err err -> Err err
|
||||
// }
|
||||
// )
|
||||
|
||||
let (decode_custom_ret_var, decode_custom) = custom_decoder(
|
||||
env,
|
||||
field_var,
|
||||
decode_err_var,
|
||||
state_record_var,
|
||||
&field_name,
|
||||
result_field_var,
|
||||
state_arg_symbol,
|
||||
);
|
||||
|
||||
env.unify(keep_payload_var, decode_custom_ret_var);
|
||||
|
||||
let keep = {
|
||||
// Keep (Decode.custom \bytes, fmt ->
|
||||
// when Decode.decodeWith bytes Decode.decoder fmt is
|
||||
// rec ->
|
||||
// {
|
||||
// rest: rec.rest,
|
||||
// result: when rec.result is
|
||||
// Ok val -> Ok {state & first: Ok val},
|
||||
// Err err -> Err err
|
||||
// }
|
||||
// )
|
||||
Expr::Tag {
|
||||
tag_union_var: keep_or_skip_var,
|
||||
ext_var: env.new_ext_var(ExtensionKind::TagUnion),
|
||||
name: "Keep".into(),
|
||||
arguments: vec![(decode_custom_ret_var, Loc::at_zero(decode_custom))],
|
||||
}
|
||||
};
|
||||
|
||||
let branch = {
|
||||
// "first" ->
|
||||
// Keep (Decode.custom \bytes, fmt ->
|
||||
// when Decode.decodeWith bytes Decode.decoder fmt is
|
||||
// rec ->
|
||||
// {
|
||||
// rest: rec.rest,
|
||||
// result: when rec.result is
|
||||
// Ok val -> Ok {state & first: Ok val},
|
||||
// Err err -> Err err
|
||||
// }
|
||||
// )
|
||||
WhenBranch {
|
||||
patterns: vec![WhenBranchPattern {
|
||||
pattern: Loc::at_zero(Pattern::StrLiteral(field_name.into())),
|
||||
degenerate: false,
|
||||
}],
|
||||
value: Loc::at_zero(keep),
|
||||
guard: None,
|
||||
redundant: RedundantMark::known_non_redundant(),
|
||||
}
|
||||
};
|
||||
|
||||
branches.push(branch);
|
||||
}
|
||||
|
||||
// Example: `_ -> Skip`
|
||||
let default_branch = WhenBranch {
|
||||
patterns: vec![WhenBranchPattern {
|
||||
pattern: Loc::at_zero(Pattern::Underscore),
|
||||
degenerate: false,
|
||||
}],
|
||||
value: Loc::at_zero(Expr::Tag {
|
||||
tag_union_var: keep_or_skip_var,
|
||||
ext_var: env.new_ext_var(ExtensionKind::TagUnion),
|
||||
name: "Skip".into(),
|
||||
arguments: Vec::new(),
|
||||
}),
|
||||
guard: None,
|
||||
redundant: RedundantMark::known_non_redundant(),
|
||||
};
|
||||
|
||||
branches.push(default_branch);
|
||||
|
||||
// when field is
|
||||
let body = Expr::When {
|
||||
loc_cond: Box::new(Loc::at_zero(Expr::Var(field_arg_symbol, Variable::STR))),
|
||||
cond_var: Variable::STR,
|
||||
expr_var: keep_or_skip_var,
|
||||
region: Region::zero(),
|
||||
branches,
|
||||
branches_cond_var: Variable::STR,
|
||||
exhaustive: ExhaustiveMark::known_exhaustive(),
|
||||
};
|
||||
|
||||
let step_field_closure = env.new_symbol("stepField");
|
||||
let function_type = env.subs.fresh_unnamed_flex_var();
|
||||
let closure_type = {
|
||||
let lambda_set = LambdaSet {
|
||||
solved: UnionLambdas::tag_without_arguments(env.subs, step_field_closure),
|
||||
recursion_var: OptVariable::NONE,
|
||||
unspecialized: Default::default(),
|
||||
ambient_function: function_type,
|
||||
};
|
||||
|
||||
synth_var(env.subs, Content::LambdaSet(lambda_set))
|
||||
};
|
||||
|
||||
{
|
||||
let args_slice = SubsSlice::insert_into_subs(env.subs, [state_record_var, Variable::STR]);
|
||||
|
||||
env.subs.set_content(
|
||||
function_type,
|
||||
Content::Structure(FlatType::Func(args_slice, closure_type, keep_or_skip_var)),
|
||||
)
|
||||
};
|
||||
|
||||
let expr = Expr::Closure(ClosureData {
|
||||
function_type,
|
||||
closure_type,
|
||||
return_type: keep_or_skip_var,
|
||||
name: step_field_closure,
|
||||
captured_symbols: Vec::new(),
|
||||
recursive: Recursive::NotRecursive,
|
||||
arguments: vec![
|
||||
(
|
||||
state_record_var,
|
||||
AnnotatedMark::known_exhaustive(),
|
||||
Loc::at_zero(Pattern::Identifier(state_arg_symbol)),
|
||||
),
|
||||
(
|
||||
Variable::STR,
|
||||
AnnotatedMark::known_exhaustive(),
|
||||
Loc::at_zero(Pattern::Identifier(field_arg_symbol)),
|
||||
),
|
||||
],
|
||||
loc_body: Box::new(Loc::at_zero(body)),
|
||||
});
|
||||
|
||||
(expr, function_type)
|
||||
}
|
||||
/// ```roc
|
||||
/// Decode.custom \bytes, fmt ->
|
||||
/// # Uses a single-branch `when` because `let` is more expensive to monomorphize
|
||||
/// # due to checks for polymorphic expressions, and `rec` would be polymorphic.
|
||||
/// when Decode.decodeWith bytes Decode.decoder fmt is
|
||||
/// rec ->
|
||||
/// {
|
||||
/// rest: rec.rest,
|
||||
/// result: when rec.result is
|
||||
/// Ok val -> Ok {state & first: Ok val},
|
||||
/// Err err -> Err err
|
||||
/// }
|
||||
/// )
|
||||
/// ```
|
||||
///Expression for custom decoder
|
||||
fn custom_decoder(
|
||||
env: &mut Env<'_>,
|
||||
field_var: Variable,
|
||||
decode_err_var: Variable,
|
||||
state_record_var: Variable,
|
||||
field_name: &Lowercase,
|
||||
result_field_var: Variable,
|
||||
state_arg_symbol: Symbol,
|
||||
) -> (Variable, Expr) {
|
||||
let (this_custom_callback_var, custom_callback) = custom_decoder_lambda(
|
||||
env,
|
||||
field_name,
|
||||
field_var,
|
||||
state_arg_symbol,
|
||||
state_record_var,
|
||||
result_field_var,
|
||||
decode_err_var,
|
||||
);
|
||||
|
||||
let decode_custom_ret_var = env.subs.fresh_unnamed_flex_var();
|
||||
let decode_custom = {
|
||||
let decode_custom_var = env.import_builtin_symbol_var(Symbol::DECODE_CUSTOM);
|
||||
let decode_custom_closure_var = env.subs.fresh_unnamed_flex_var();
|
||||
let this_decode_custom_var = {
|
||||
let subs_slice = SubsSlice::insert_into_subs(env.subs, [this_custom_callback_var]);
|
||||
let flat_type =
|
||||
FlatType::Func(subs_slice, decode_custom_closure_var, decode_custom_ret_var);
|
||||
|
||||
synth_var(env.subs, Content::Structure(flat_type))
|
||||
};
|
||||
|
||||
env.unify(decode_custom_var, this_decode_custom_var);
|
||||
|
||||
// Decode.custom \bytes, fmt -> …
|
||||
Expr::Call(
|
||||
Box::new((
|
||||
this_decode_custom_var,
|
||||
Loc::at_zero(Expr::Var(Symbol::DECODE_CUSTOM, this_decode_custom_var)),
|
||||
decode_custom_closure_var,
|
||||
decode_custom_ret_var,
|
||||
)),
|
||||
vec![(this_custom_callback_var, Loc::at_zero(custom_callback))],
|
||||
CalledVia::Space,
|
||||
)
|
||||
};
|
||||
(decode_custom_ret_var, decode_custom)
|
||||
}
|
||||
/// ```roc
|
||||
/// \bytes, fmt ->
|
||||
/// when Decode.decodeWith bytes Decode.decoder fmt is
|
||||
/// rec ->
|
||||
/// {
|
||||
/// rest: rec.rest,
|
||||
/// result: when rec.result is
|
||||
/// Ok val -> Ok {state & first: Ok val},
|
||||
/// Err err -> Err err
|
||||
/// }
|
||||
///
|
||||
/// ```
|
||||
|
||||
fn custom_decoder_lambda(
|
||||
env: &mut Env<'_>,
|
||||
field_name: &Lowercase,
|
||||
field_var: Variable,
|
||||
state_arg_symbol: Symbol,
|
||||
state_record_var: Variable,
|
||||
result_field_var: Variable,
|
||||
decode_err_var: Variable,
|
||||
) -> (Variable, Expr) {
|
||||
let this_custom_callback_var;
|
||||
let custom_callback_ret_var;
|
||||
|
||||
// \bytes, fmt ->
|
||||
// when Decode.decodeWith bytes Decode.decoder fmt is
|
||||
// rec ->
|
||||
// {
|
||||
// rest: rec.rest,
|
||||
// result: when rec.result is
|
||||
// Ok val -> Ok {state & first: Ok val},
|
||||
// Err err -> Err err
|
||||
// }
|
||||
let custom_callback = {
|
||||
let bytes_arg_symbol = env.new_symbol("bytes");
|
||||
let fmt_arg_symbol = env.new_symbol("fmt");
|
||||
let bytes_arg_var = env.subs.fresh_unnamed_flex_var();
|
||||
let fmt_arg_var = env.subs.fresh_unnamed_flex_var();
|
||||
// The result of decoding this field's value - either the updated state, or a decoding error.
|
||||
let when_expr_var = {
|
||||
let flat_type = FlatType::TagUnion(
|
||||
UnionTags::for_result(env.subs, state_record_var, decode_err_var),
|
||||
TagExt::Any(Variable::EMPTY_TAG_UNION),
|
||||
);
|
||||
|
||||
synth_var(env.subs, Content::Structure(flat_type))
|
||||
};
|
||||
|
||||
// What our decoder passed to `Decode.custom` returns - the result of decoding the
|
||||
// field's value, and the remaining bytes.
|
||||
custom_callback_ret_var = {
|
||||
let rest_field = RecordField::Required(Variable::LIST_U8);
|
||||
let result_field = RecordField::Required(when_expr_var);
|
||||
let flat_type = FlatType::Record(
|
||||
RecordFields::insert_into_subs(
|
||||
env.subs,
|
||||
[("rest".into(), rest_field), ("result".into(), result_field)],
|
||||
),
|
||||
Variable::EMPTY_RECORD,
|
||||
);
|
||||
|
||||
synth_var(env.subs, Content::Structure(flat_type))
|
||||
};
|
||||
|
||||
// Decode.decodeWith bytes Decode.decoder fmt
|
||||
let (condition_expr, rec_var, rec_dot_result) = decode_with(
|
||||
env,
|
||||
field_var,
|
||||
Expr::Var(bytes_arg_symbol, bytes_arg_var),
|
||||
fmt_arg_var,
|
||||
fmt_arg_symbol,
|
||||
decode_err_var,
|
||||
);
|
||||
|
||||
// # Uses a single-branch `when` because `let` is more expensive to monomorphize
|
||||
// # due to checks for polymorphic expressions, and `rec` would be polymorphic.
|
||||
// when Decode.decodeWith bytes Decode.decoder fmt is
|
||||
// rec ->
|
||||
// {
|
||||
// rest: rec.rest,
|
||||
// result: when rec.result is
|
||||
// Ok val -> Ok {state & first: Ok val},
|
||||
// Err err -> Err err
|
||||
// }
|
||||
let custom_callback_body = {
|
||||
let rec_symbol = env.new_symbol("rec");
|
||||
|
||||
// {
|
||||
// rest: rec.rest,
|
||||
// result: when rec.result is
|
||||
// Ok val -> Ok {state & first: Ok val},
|
||||
// Err err -> Err err
|
||||
// }
|
||||
let branch_body = state_record_update(
|
||||
env,
|
||||
field_name,
|
||||
field_var,
|
||||
state_arg_symbol,
|
||||
state_record_var,
|
||||
rec_symbol,
|
||||
rec_var,
|
||||
rec_dot_result,
|
||||
when_expr_var,
|
||||
custom_callback_ret_var,
|
||||
decode_err_var,
|
||||
result_field_var,
|
||||
);
|
||||
|
||||
let branch = WhenBranch {
|
||||
patterns: vec![WhenBranchPattern {
|
||||
pattern: Loc::at_zero(Pattern::Identifier(rec_symbol)),
|
||||
degenerate: false,
|
||||
}],
|
||||
value: Loc::at_zero(branch_body),
|
||||
guard: None,
|
||||
redundant: RedundantMark::known_non_redundant(),
|
||||
};
|
||||
|
||||
// when Decode.decodeWith bytes Decode.decoder fmt is
|
||||
// ...
|
||||
Expr::When {
|
||||
loc_cond: Box::new(Loc::at_zero(condition_expr)),
|
||||
cond_var: rec_var,
|
||||
expr_var: custom_callback_ret_var,
|
||||
region: Region::zero(),
|
||||
branches: vec![branch],
|
||||
branches_cond_var: rec_var,
|
||||
exhaustive: ExhaustiveMark::known_exhaustive(),
|
||||
}
|
||||
};
|
||||
let custom_closure_symbol = env.new_symbol("customCallback");
|
||||
this_custom_callback_var = env.subs.fresh_unnamed_flex_var();
|
||||
let custom_callback_lambda_set_var = {
|
||||
let content = Content::LambdaSet(LambdaSet {
|
||||
solved: UnionLambdas::insert_into_subs(
|
||||
env.subs,
|
||||
[(custom_closure_symbol, [state_record_var])],
|
||||
),
|
||||
recursion_var: OptVariable::NONE,
|
||||
unspecialized: Default::default(),
|
||||
ambient_function: this_custom_callback_var,
|
||||
});
|
||||
let custom_callback_lambda_set_var = synth_var(env.subs, content);
|
||||
let subs_slice = SubsSlice::insert_into_subs(env.subs, [bytes_arg_var, fmt_arg_var]);
|
||||
|
||||
env.subs.set_content(
|
||||
this_custom_callback_var,
|
||||
Content::Structure(FlatType::Func(
|
||||
subs_slice,
|
||||
custom_callback_lambda_set_var,
|
||||
custom_callback_ret_var,
|
||||
)),
|
||||
);
|
||||
|
||||
custom_callback_lambda_set_var
|
||||
};
|
||||
|
||||
// \bytes, fmt -> …
|
||||
Expr::Closure(ClosureData {
|
||||
function_type: this_custom_callback_var,
|
||||
closure_type: custom_callback_lambda_set_var,
|
||||
return_type: custom_callback_ret_var,
|
||||
name: custom_closure_symbol,
|
||||
captured_symbols: vec![(state_arg_symbol, state_record_var)],
|
||||
recursive: Recursive::NotRecursive,
|
||||
arguments: vec![
|
||||
(
|
||||
bytes_arg_var,
|
||||
AnnotatedMark::known_exhaustive(),
|
||||
Loc::at_zero(Pattern::Identifier(bytes_arg_symbol)),
|
||||
),
|
||||
(
|
||||
fmt_arg_var,
|
||||
AnnotatedMark::known_exhaustive(),
|
||||
Loc::at_zero(Pattern::Identifier(fmt_arg_symbol)),
|
||||
),
|
||||
],
|
||||
loc_body: Box::new(Loc::at_zero(custom_callback_body)),
|
||||
})
|
||||
};
|
||||
(this_custom_callback_var, custom_callback)
|
||||
}
|
||||
|
||||
/// ```roc
|
||||
/// {
|
||||
/// rest: rec.rest,
|
||||
/// result: when rec.result is
|
||||
/// Ok val -> Ok {state & first: Ok val},
|
||||
/// Err err -> Err err
|
||||
/// }
|
||||
/// ```
|
||||
fn state_record_update(
|
||||
env: &mut Env<'_>,
|
||||
field_name: &Lowercase,
|
||||
field_var: Variable,
|
||||
state_arg_symbol: Symbol,
|
||||
state_record_var: Variable,
|
||||
rec_symbol: Symbol,
|
||||
rec_var: Variable,
|
||||
rec_dot_result: Variable,
|
||||
when_expr_var: Variable,
|
||||
custom_callback_ret_var: Variable,
|
||||
decode_err_var: Variable,
|
||||
result_field_var: Variable,
|
||||
) -> Expr {
|
||||
let branch_body = {
|
||||
// result: when rec.result is
|
||||
// Ok val -> Ok {state & first: Ok val},
|
||||
// Err err -> Err err
|
||||
let result_val = {
|
||||
let ok_val_symbol = env.new_symbol("val");
|
||||
let err_val_symbol = env.new_symbol("err");
|
||||
|
||||
// Ok {state & first: Ok val},
|
||||
let ok_branch_expr = {
|
||||
let mut updates = SendMap::default();
|
||||
|
||||
updates.insert(
|
||||
field_name.clone(),
|
||||
Field {
|
||||
var: result_field_var,
|
||||
region: Region::zero(),
|
||||
loc_expr: Box::new(Loc::at_zero(Expr::Tag {
|
||||
tag_union_var: result_field_var,
|
||||
ext_var: env.new_ext_var(ExtensionKind::TagUnion),
|
||||
name: "Ok".into(),
|
||||
arguments: vec![(
|
||||
field_var,
|
||||
Loc::at_zero(Expr::Var(ok_val_symbol, field_var)),
|
||||
)],
|
||||
})),
|
||||
},
|
||||
);
|
||||
|
||||
let updated_record = Expr::RecordUpdate {
|
||||
record_var: state_record_var,
|
||||
ext_var: env.new_ext_var(ExtensionKind::Record),
|
||||
symbol: state_arg_symbol,
|
||||
updates,
|
||||
};
|
||||
|
||||
Expr::Tag {
|
||||
tag_union_var: when_expr_var,
|
||||
ext_var: env.new_ext_var(ExtensionKind::TagUnion),
|
||||
name: "Ok".into(),
|
||||
arguments: vec![(state_record_var, Loc::at_zero(updated_record))],
|
||||
}
|
||||
};
|
||||
|
||||
let branches = vec![
|
||||
// Ok val -> Ok {state & first: Ok val},
|
||||
WhenBranch {
|
||||
patterns: vec![WhenBranchPattern {
|
||||
pattern: Loc::at_zero(Pattern::AppliedTag {
|
||||
whole_var: rec_dot_result,
|
||||
ext_var: Variable::EMPTY_TAG_UNION,
|
||||
tag_name: "Ok".into(),
|
||||
arguments: vec![(
|
||||
field_var,
|
||||
Loc::at_zero(Pattern::Identifier(ok_val_symbol)),
|
||||
)],
|
||||
}),
|
||||
degenerate: false,
|
||||
}],
|
||||
value: Loc::at_zero(ok_branch_expr),
|
||||
guard: None,
|
||||
redundant: RedundantMark::known_non_redundant(),
|
||||
},
|
||||
// Err err -> Err err
|
||||
WhenBranch {
|
||||
patterns: vec![WhenBranchPattern {
|
||||
pattern: Loc::at_zero(Pattern::AppliedTag {
|
||||
whole_var: rec_dot_result,
|
||||
ext_var: Variable::EMPTY_TAG_UNION,
|
||||
tag_name: "Err".into(),
|
||||
arguments: vec![(
|
||||
decode_err_var,
|
||||
Loc::at_zero(Pattern::Identifier(err_val_symbol)),
|
||||
)],
|
||||
}),
|
||||
degenerate: false,
|
||||
}],
|
||||
value: Loc::at_zero(Expr::Tag {
|
||||
tag_union_var: when_expr_var,
|
||||
ext_var: env.new_ext_var(ExtensionKind::TagUnion),
|
||||
name: "Err".into(),
|
||||
arguments: vec![(
|
||||
decode_err_var,
|
||||
Loc::at_zero(Expr::Var(err_val_symbol, decode_err_var)),
|
||||
)],
|
||||
}),
|
||||
guard: None,
|
||||
redundant: RedundantMark::known_non_redundant(),
|
||||
},
|
||||
];
|
||||
|
||||
// when rec.result is
|
||||
// Ok val -> Ok {state & first: Ok val},
|
||||
// Err err -> Err err
|
||||
Expr::When {
|
||||
loc_cond: Box::new(Loc::at_zero(Expr::RecordAccess {
|
||||
record_var: rec_var,
|
||||
ext_var: env.new_ext_var(ExtensionKind::Record),
|
||||
field_var: rec_dot_result,
|
||||
loc_expr: Box::new(Loc::at_zero(Expr::Var(rec_symbol, rec_var))),
|
||||
field: "result".into(),
|
||||
})),
|
||||
cond_var: rec_dot_result,
|
||||
expr_var: when_expr_var,
|
||||
region: Region::zero(),
|
||||
branches,
|
||||
branches_cond_var: rec_dot_result,
|
||||
exhaustive: ExhaustiveMark::known_exhaustive(),
|
||||
}
|
||||
};
|
||||
|
||||
// {
|
||||
// rest: rec.rest,
|
||||
// result: when rec.result is
|
||||
// Ok val -> Ok {state & first: Ok val},
|
||||
// Err err -> Err err
|
||||
// }
|
||||
let mut fields_map = SendMap::default();
|
||||
|
||||
fields_map.insert(
|
||||
"rest".into(),
|
||||
Field {
|
||||
var: Variable::LIST_U8,
|
||||
region: Region::zero(),
|
||||
loc_expr: Box::new(Loc::at_zero(Expr::RecordAccess {
|
||||
record_var: rec_var,
|
||||
ext_var: env.new_ext_var(ExtensionKind::Record),
|
||||
field_var: Variable::LIST_U8,
|
||||
loc_expr: Box::new(Loc::at_zero(Expr::Var(rec_symbol, rec_var))),
|
||||
field: "rest".into(),
|
||||
})),
|
||||
},
|
||||
);
|
||||
|
||||
// result: when rec.result is
|
||||
// Ok val -> Ok {state & first: Ok val},
|
||||
// Err err -> Err err
|
||||
fields_map.insert(
|
||||
"result".into(),
|
||||
Field {
|
||||
var: when_expr_var,
|
||||
region: Region::zero(),
|
||||
loc_expr: Box::new(Loc::at_zero(result_val)),
|
||||
},
|
||||
);
|
||||
|
||||
Expr::Record {
|
||||
record_var: custom_callback_ret_var,
|
||||
fields: fields_map,
|
||||
}
|
||||
};
|
||||
branch_body
|
||||
}
|
||||
Loading…
Add table
Add a link
Reference in a new issue