diff options
Diffstat (limited to '')
| -rw-r--r-- | dhall/src/phase/mod.rs | 3 | ||||
| -rw-r--r-- | dhall/src/phase/normalize.rs | 131 |
2 files changed, 113 insertions, 21 deletions
diff --git a/dhall/src/phase/mod.rs b/dhall/src/phase/mod.rs index d658638..ca50727 100644 --- a/dhall/src/phase/mod.rs +++ b/dhall/src/phase/mod.rs @@ -180,6 +180,9 @@ impl Type { pub(crate) fn to_value(&self) -> Value { self.0.to_value() } + pub(crate) fn to_thunk(&self) -> Thunk { + self.0.to_thunk() + } pub(crate) fn as_const(&self) -> Option<Const> { // TODO: avoid clone match &self.to_value() { diff --git a/dhall/src/phase/normalize.rs b/dhall/src/phase/normalize.rs index 81abb9c..d9e4331 100644 --- a/dhall/src/phase/normalize.rs +++ b/dhall/src/phase/normalize.rs @@ -344,6 +344,31 @@ pub(crate) fn squash_textlit( ret } +fn merge_maps<K, V>( + map1: &BTreeMap<K, V>, + map2: &BTreeMap<K, V>, + mut f: impl FnMut(&V, &V) -> V, +) -> BTreeMap<K, V> +where + K: Ord + Clone, + V: Clone, +{ + let mut kvs = BTreeMap::new(); + for (x, v2) in map2 { + let newv = if let Some(v1) = map1.get(x) { + f(v1, v2) + } else { + v2.clone() + }; + kvs.insert(x.clone(), newv); + } + for (x, v1) in map1 { + // Insert only if key not already present + kvs.entry(x.clone()).or_insert_with(|| v1.clone()); + } + kvs +} + /// Reduces the imput expression to a Value. Evaluates as little as possible. pub(crate) fn normalize_whnf( ctx: NormalizationContext, @@ -470,7 +495,8 @@ pub(crate) fn normalize_one_layer(expr: ExprF<Thunk, Label, X>) -> Value { ExprF::BinOp(o, ref x, ref y) => { use BinOp::{ BoolAnd, BoolEQ, BoolNE, BoolOr, ListAppend, NaturalPlus, - NaturalTimes, TextAppend, + NaturalTimes, RecursiveRecordMerge, RecursiveRecordTypeMerge, + RightBiasedRecordMerge, TextAppend, }; let x_borrow = x.as_value(); let y_borrow = y.as_value(); @@ -533,6 +559,69 @@ pub(crate) fn normalize_one_layer(expr: ExprF<Thunk, Label, X>) -> Value { ))) } + (RightBiasedRecordMerge, _, RecordLit(kvs)) + if kvs.is_empty() => + { + RetThunkRef(x) + } + (RightBiasedRecordMerge, RecordLit(kvs), _) + if kvs.is_empty() => + { + RetThunkRef(y) + } + (RightBiasedRecordMerge, RecordLit(kvs1), RecordLit(kvs2)) => { + let mut kvs = kvs2.clone(); + for (x, v) in kvs1 { + // Insert only if key not already present + kvs.entry(x.clone()).or_insert_with(|| v.clone()); + } + RetValue(RecordLit(kvs)) + } + + (RecursiveRecordMerge, _, RecordLit(kvs)) if kvs.is_empty() => { + RetThunkRef(x) + } + (RecursiveRecordMerge, RecordLit(kvs), _) if kvs.is_empty() => { + RetThunkRef(y) + } + (RecursiveRecordMerge, RecordLit(kvs1), RecordLit(kvs2)) => { + let kvs = merge_maps(kvs1, kvs2, |v1, v2| { + Thunk::from_partial_expr(ExprF::BinOp( + RecursiveRecordMerge, + v1.clone(), + v2.clone(), + )) + }); + RetValue(RecordLit(kvs)) + } + + (RecursiveRecordTypeMerge, _, RecordType(kvs)) + if kvs.is_empty() => + { + RetThunkRef(x) + } + (RecursiveRecordTypeMerge, RecordType(kvs), _) + if kvs.is_empty() => + { + RetThunkRef(y) + } + ( + RecursiveRecordTypeMerge, + RecordType(kvs1), + RecordType(kvs2), + ) => { + let kvs = merge_maps(kvs1, kvs2, |v1, v2| { + TypeThunk::from_thunk(Thunk::from_partial_expr( + ExprF::BinOp( + RecursiveRecordTypeMerge, + v1.to_thunk(), + v2.to_thunk(), + ), + )) + }); + RetValue(RecordType(kvs)) + } + _ => { drop(x_borrow); drop(y_borrow); @@ -635,9 +724,9 @@ mod spec_tests { norm!(success_haskell_tutorial_access_0, "haskell-tutorial/access/0"); norm!(success_haskell_tutorial_access_1, "haskell-tutorial/access/1"); - // norm!(success_haskell_tutorial_combineTypes_0, "haskell-tutorial/combineTypes/0"); - // norm!(success_haskell_tutorial_combineTypes_1, "haskell-tutorial/combineTypes/1"); - // norm!(success_haskell_tutorial_prefer_0, "haskell-tutorial/prefer/0"); + norm!(success_haskell_tutorial_combineTypes_0, "haskell-tutorial/combineTypes/0"); + norm!(success_haskell_tutorial_combineTypes_1, "haskell-tutorial/combineTypes/1"); + norm!(success_haskell_tutorial_prefer_0, "haskell-tutorial/prefer/0"); norm!(success_haskell_tutorial_projection_0, "haskell-tutorial/projection/0"); norm!(success_prelude_Bool_and_0, "prelude/Bool/and/0"); @@ -783,7 +872,7 @@ mod spec_tests { norm!(success_simple_optionalBuild, "simple/optionalBuild"); norm!(success_simple_optionalBuildFold, "simple/optionalBuildFold"); norm!(success_simple_optionalFold, "simple/optionalFold"); - // norm!(success_simple_sortOperator, "simple/sortOperator"); + norm!(success_simple_sortOperator, "simple/sortOperator"); norm!(success_simplifications_and, "simplifications/and"); norm!(success_simplifications_eq, "simplifications/eq"); norm!(success_simplifications_ifThenElse, "simplifications/ifThenElse"); @@ -924,22 +1013,22 @@ mod spec_tests { norm!(success_unit_RecordSelectionNormalizeArguments, "unit/RecordSelectionNormalizeArguments"); norm!(success_unit_RecordType, "unit/RecordType"); norm!(success_unit_RecordTypeEmpty, "unit/RecordTypeEmpty"); - // norm!(success_unit_RecursiveRecordMergeCollision, "unit/RecursiveRecordMergeCollision"); - // norm!(success_unit_RecursiveRecordMergeLhsEmpty, "unit/RecursiveRecordMergeLhsEmpty"); - // norm!(success_unit_RecursiveRecordMergeNoCollision, "unit/RecursiveRecordMergeNoCollision"); - // norm!(success_unit_RecursiveRecordMergeNormalizeArguments, "unit/RecursiveRecordMergeNormalizeArguments"); - // norm!(success_unit_RecursiveRecordMergeRhsEmpty, "unit/RecursiveRecordMergeRhsEmpty"); - // norm!(success_unit_RecursiveRecordTypeMergeCollision, "unit/RecursiveRecordTypeMergeCollision"); - // norm!(success_unit_RecursiveRecordTypeMergeLhsEmpty, "unit/RecursiveRecordTypeMergeLhsEmpty"); - // norm!(success_unit_RecursiveRecordTypeMergeNoCollision, "unit/RecursiveRecordTypeMergeNoCollision"); - // norm!(success_unit_RecursiveRecordTypeMergeNormalizeArguments, "unit/RecursiveRecordTypeMergeNormalizeArguments"); - // norm!(success_unit_RecursiveRecordTypeMergeRhsEmpty, "unit/RecursiveRecordTypeMergeRhsEmpty"); - // norm!(success_unit_RecursiveRecordTypeMergeSorts, "unit/RecursiveRecordTypeMergeSorts"); - // norm!(success_unit_RightBiasedRecordMergeCollision, "unit/RightBiasedRecordMergeCollision"); - // norm!(success_unit_RightBiasedRecordMergeLhsEmpty, "unit/RightBiasedRecordMergeLhsEmpty"); - // norm!(success_unit_RightBiasedRecordMergeNoCollision, "unit/RightBiasedRecordMergeNoCollision"); - // norm!(success_unit_RightBiasedRecordMergeNormalizeArguments, "unit/RightBiasedRecordMergeNormalizeArguments"); - // norm!(success_unit_RightBiasedRecordMergeRhsEmpty, "unit/RightBiasedRecordMergeRhsEmpty"); + norm!(success_unit_RecursiveRecordMergeCollision, "unit/RecursiveRecordMergeCollision"); + norm!(success_unit_RecursiveRecordMergeLhsEmpty, "unit/RecursiveRecordMergeLhsEmpty"); + norm!(success_unit_RecursiveRecordMergeNoCollision, "unit/RecursiveRecordMergeNoCollision"); + norm!(success_unit_RecursiveRecordMergeNormalizeArguments, "unit/RecursiveRecordMergeNormalizeArguments"); + norm!(success_unit_RecursiveRecordMergeRhsEmpty, "unit/RecursiveRecordMergeRhsEmpty"); + norm!(success_unit_RecursiveRecordTypeMergeCollision, "unit/RecursiveRecordTypeMergeCollision"); + norm!(success_unit_RecursiveRecordTypeMergeLhsEmpty, "unit/RecursiveRecordTypeMergeLhsEmpty"); + norm!(success_unit_RecursiveRecordTypeMergeNoCollision, "unit/RecursiveRecordTypeMergeNoCollision"); + norm!(success_unit_RecursiveRecordTypeMergeNormalizeArguments, "unit/RecursiveRecordTypeMergeNormalizeArguments"); + norm!(success_unit_RecursiveRecordTypeMergeRhsEmpty, "unit/RecursiveRecordTypeMergeRhsEmpty"); + norm!(success_unit_RecursiveRecordTypeMergeSorts, "unit/RecursiveRecordTypeMergeSorts"); + norm!(success_unit_RightBiasedRecordMergeCollision, "unit/RightBiasedRecordMergeCollision"); + norm!(success_unit_RightBiasedRecordMergeLhsEmpty, "unit/RightBiasedRecordMergeLhsEmpty"); + norm!(success_unit_RightBiasedRecordMergeNoCollision, "unit/RightBiasedRecordMergeNoCollision"); + norm!(success_unit_RightBiasedRecordMergeNormalizeArguments, "unit/RightBiasedRecordMergeNormalizeArguments"); + norm!(success_unit_RightBiasedRecordMergeRhsEmpty, "unit/RightBiasedRecordMergeRhsEmpty"); norm!(success_unit_SomeNormalizeArguments, "unit/SomeNormalizeArguments"); norm!(success_unit_Sort, "unit/Sort"); norm!(success_unit_Text, "unit/Text"); |