diff options
author | Nadrieril Feneanar | 2019-12-20 19:39:16 +0000 |
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committer | GitHub | 2019-12-20 19:39:16 +0000 |
commit | de0dd59204e979e29445d634a0739394110261ef (patch) | |
tree | a75ce010c7ea771a03cb51cc2b828dad6ea1a9f7 /dhall/src/semantics/core/valuef.rs | |
parent | 91ef0cf697d56c91a8d15937aa4669dc221cd6c1 (diff) | |
parent | 64cca1837cc97b7679c4e2ffd54a22ad50f05cfd (diff) |
Merge pull request #118 from Nadrieril/clarify-types
Clarify naming and file organization
Diffstat (limited to '')
-rw-r--r-- | dhall/src/semantics/core/valuef.rs | 323 |
1 files changed, 0 insertions, 323 deletions
diff --git a/dhall/src/semantics/core/valuef.rs b/dhall/src/semantics/core/valuef.rs deleted file mode 100644 index 73c715a..0000000 --- a/dhall/src/semantics/core/valuef.rs +++ /dev/null @@ -1,323 +0,0 @@ -use std::collections::HashMap; - -use crate::semantics::core::value::{ToExprOptions, Value}; -use crate::semantics::core::var::{AlphaLabel, AlphaVar, Shift, Subst}; -use crate::semantics::phase::typecheck::rc; -use crate::semantics::phase::{Normalized, NormalizedExpr}; -use crate::syntax; -use crate::syntax::{ - Builtin, Const, ExprF, Integer, InterpolatedTextContents, Label, - NaiveDouble, Natural, -}; - -/// A semantic value. Subexpressions are Values, which are partially evaluated expressions that are -/// normalized on-demand. -/// If you compare for equality two `ValueF`s in WHNF, then equality will be up to -/// alpha-equivalence (renaming of bound variables) and beta-equivalence (normalization). It will -/// recursively normalize as needed. -#[derive(Debug, Clone, PartialEq, Eq)] -pub(crate) enum ValueF { - /// Closures - Lam(AlphaLabel, Value, Value), - Pi(AlphaLabel, Value, Value), - // Invariant: in whnf, the evaluation must not be able to progress further. - AppliedBuiltin(Builtin, Vec<Value>), - - Var(AlphaVar), - Const(Const), - BoolLit(bool), - NaturalLit(Natural), - IntegerLit(Integer), - DoubleLit(NaiveDouble), - EmptyOptionalLit(Value), - NEOptionalLit(Value), - // EmptyListLit(t) means `[] : List t`, not `[] : t` - EmptyListLit(Value), - NEListLit(Vec<Value>), - RecordType(HashMap<Label, Value>), - RecordLit(HashMap<Label, Value>), - UnionType(HashMap<Label, Option<Value>>), - UnionConstructor(Label, HashMap<Label, Option<Value>>), - UnionLit(Label, Value, HashMap<Label, Option<Value>>), - // Invariant: in whnf, this must not contain interpolations that are themselves TextLits, and - // contiguous text values must be merged. - TextLit(Vec<InterpolatedTextContents<Value>>), - Equivalence(Value, Value), - // Invariant: in whnf, this must not contain a value captured by one of the variants above. - PartialExpr(ExprF<Value, Normalized>), -} - -impl ValueF { - pub(crate) fn into_value_with_type(self, t: Value) -> Value { - Value::from_valuef_and_type(self, t) - } - - pub(crate) fn to_expr(&self, opts: ToExprOptions) -> NormalizedExpr { - match self { - ValueF::Lam(x, t, e) => rc(ExprF::Lam( - x.to_label_maybe_alpha(opts.alpha), - t.to_expr(opts), - e.to_expr(opts), - )), - ValueF::AppliedBuiltin(b, args) => args - .iter() - .map(|v| v.to_expr(opts)) - .fold(rc(ExprF::Builtin(*b)), |acc, v| rc(ExprF::App(acc, v))), - ValueF::Pi(x, t, e) => rc(ExprF::Pi( - x.to_label_maybe_alpha(opts.alpha), - t.to_expr(opts), - e.to_expr(opts), - )), - ValueF::Var(v) => rc(ExprF::Var(v.to_var(opts.alpha))), - ValueF::Const(c) => rc(ExprF::Const(*c)), - ValueF::BoolLit(b) => rc(ExprF::BoolLit(*b)), - ValueF::NaturalLit(n) => rc(ExprF::NaturalLit(*n)), - ValueF::IntegerLit(n) => rc(ExprF::IntegerLit(*n)), - ValueF::DoubleLit(n) => rc(ExprF::DoubleLit(*n)), - ValueF::EmptyOptionalLit(n) => rc(ExprF::App( - rc(ExprF::Builtin(Builtin::OptionalNone)), - n.to_expr(opts), - )), - ValueF::NEOptionalLit(n) => rc(ExprF::SomeLit(n.to_expr(opts))), - ValueF::EmptyListLit(n) => rc(ExprF::EmptyListLit(rc(ExprF::App( - rc(ExprF::Builtin(Builtin::List)), - n.to_expr(opts), - )))), - ValueF::NEListLit(elts) => rc(ExprF::NEListLit( - elts.iter().map(|n| n.to_expr(opts)).collect(), - )), - ValueF::RecordLit(kvs) => rc(ExprF::RecordLit( - kvs.iter() - .map(|(k, v)| (k.clone(), v.to_expr(opts))) - .collect(), - )), - ValueF::RecordType(kts) => rc(ExprF::RecordType( - kts.iter() - .map(|(k, v)| (k.clone(), v.to_expr(opts))) - .collect(), - )), - ValueF::UnionType(kts) => rc(ExprF::UnionType( - kts.iter() - .map(|(k, v)| { - (k.clone(), v.as_ref().map(|v| v.to_expr(opts))) - }) - .collect(), - )), - ValueF::UnionConstructor(l, kts) => rc(ExprF::Field( - ValueF::UnionType(kts.clone()).to_expr(opts), - l.clone(), - )), - ValueF::UnionLit(l, v, kts) => rc(ExprF::App( - ValueF::UnionConstructor(l.clone(), kts.clone()).to_expr(opts), - v.to_expr(opts), - )), - ValueF::TextLit(elts) => rc(ExprF::TextLit( - elts.iter() - .map(|contents| contents.map_ref(|e| e.to_expr(opts))) - .collect(), - )), - ValueF::Equivalence(x, y) => rc(ExprF::BinOp( - syntax::BinOp::Equivalence, - x.to_expr(opts), - y.to_expr(opts), - )), - ValueF::PartialExpr(e) => rc(e.map_ref(|v| v.to_expr(opts))), - } - } - - pub(crate) fn normalize_mut(&mut self) { - match self { - ValueF::Var(_) - | ValueF::Const(_) - | ValueF::BoolLit(_) - | ValueF::NaturalLit(_) - | ValueF::IntegerLit(_) - | ValueF::DoubleLit(_) => {} - - ValueF::EmptyOptionalLit(tth) | ValueF::EmptyListLit(tth) => { - tth.normalize_mut(); - } - - ValueF::NEOptionalLit(th) => { - th.normalize_mut(); - } - ValueF::Lam(_, t, e) => { - t.normalize_mut(); - e.normalize_mut(); - } - ValueF::Pi(_, t, e) => { - t.normalize_mut(); - e.normalize_mut(); - } - ValueF::AppliedBuiltin(_, args) => { - for x in args.iter_mut() { - x.normalize_mut(); - } - } - ValueF::NEListLit(elts) => { - for x in elts.iter_mut() { - x.normalize_mut(); - } - } - ValueF::RecordLit(kvs) => { - for x in kvs.values_mut() { - x.normalize_mut(); - } - } - ValueF::RecordType(kvs) => { - for x in kvs.values_mut() { - x.normalize_mut(); - } - } - ValueF::UnionType(kts) | ValueF::UnionConstructor(_, kts) => { - for x in kts.values_mut().flat_map(|opt| opt) { - x.normalize_mut(); - } - } - ValueF::UnionLit(_, v, kts) => { - v.normalize_mut(); - for x in kts.values_mut().flat_map(|opt| opt) { - x.normalize_mut(); - } - } - ValueF::TextLit(elts) => { - for x in elts.iter_mut() { - x.map_mut(Value::normalize_mut); - } - } - ValueF::Equivalence(x, y) => { - x.normalize_mut(); - y.normalize_mut(); - } - ValueF::PartialExpr(e) => { - e.map_mut(Value::normalize_mut); - } - } - } - - pub(crate) fn from_builtin(b: Builtin) -> ValueF { - ValueF::AppliedBuiltin(b, vec![]) - } -} - -impl Shift for ValueF { - fn shift(&self, delta: isize, var: &AlphaVar) -> Option<Self> { - Some(match self { - ValueF::Lam(x, t, e) => ValueF::Lam( - x.clone(), - t.shift(delta, var)?, - e.shift(delta, &var.under_binder(x))?, - ), - ValueF::AppliedBuiltin(b, args) => { - ValueF::AppliedBuiltin(*b, args.shift(delta, var)?) - } - ValueF::Pi(x, t, e) => ValueF::Pi( - x.clone(), - t.shift(delta, var)?, - e.shift(delta, &var.under_binder(x))?, - ), - ValueF::Var(v) => ValueF::Var(v.shift(delta, var)?), - ValueF::Const(c) => ValueF::Const(*c), - ValueF::BoolLit(b) => ValueF::BoolLit(*b), - ValueF::NaturalLit(n) => ValueF::NaturalLit(*n), - ValueF::IntegerLit(n) => ValueF::IntegerLit(*n), - ValueF::DoubleLit(n) => ValueF::DoubleLit(*n), - ValueF::EmptyOptionalLit(tth) => { - ValueF::EmptyOptionalLit(tth.shift(delta, var)?) - } - ValueF::NEOptionalLit(th) => { - ValueF::NEOptionalLit(th.shift(delta, var)?) - } - ValueF::EmptyListLit(tth) => { - ValueF::EmptyListLit(tth.shift(delta, var)?) - } - ValueF::NEListLit(elts) => { - ValueF::NEListLit(elts.shift(delta, var)?) - } - ValueF::RecordLit(kvs) => ValueF::RecordLit(kvs.shift(delta, var)?), - ValueF::RecordType(kvs) => { - ValueF::RecordType(kvs.shift(delta, var)?) - } - ValueF::UnionType(kts) => ValueF::UnionType(kts.shift(delta, var)?), - ValueF::UnionConstructor(x, kts) => { - ValueF::UnionConstructor(x.clone(), kts.shift(delta, var)?) - } - ValueF::UnionLit(x, v, kts) => ValueF::UnionLit( - x.clone(), - v.shift(delta, var)?, - kts.shift(delta, var)?, - ), - ValueF::TextLit(elts) => ValueF::TextLit(elts.shift(delta, var)?), - ValueF::Equivalence(x, y) => { - ValueF::Equivalence(x.shift(delta, var)?, y.shift(delta, var)?) - } - ValueF::PartialExpr(e) => ValueF::PartialExpr(e.shift(delta, var)?), - }) - } -} - -impl Subst<Value> for ValueF { - fn subst_shift(&self, var: &AlphaVar, val: &Value) -> Self { - match self { - ValueF::AppliedBuiltin(b, args) => { - ValueF::AppliedBuiltin(*b, args.subst_shift(var, val)) - } - ValueF::PartialExpr(e) => { - ValueF::PartialExpr(e.subst_shift(var, val)) - } - ValueF::TextLit(elts) => { - ValueF::TextLit(elts.subst_shift(var, val)) - } - ValueF::Lam(x, t, e) => ValueF::Lam( - x.clone(), - t.subst_shift(var, val), - e.subst_shift(&var.under_binder(x), &val.under_binder(x)), - ), - ValueF::Pi(x, t, e) => ValueF::Pi( - x.clone(), - t.subst_shift(var, val), - e.subst_shift(&var.under_binder(x), &val.under_binder(x)), - ), - ValueF::Var(v) if v == var => val.to_whnf_ignore_type(), - ValueF::Var(v) => ValueF::Var(v.shift(-1, var).unwrap()), - ValueF::Const(c) => ValueF::Const(*c), - ValueF::BoolLit(b) => ValueF::BoolLit(*b), - ValueF::NaturalLit(n) => ValueF::NaturalLit(*n), - ValueF::IntegerLit(n) => ValueF::IntegerLit(*n), - ValueF::DoubleLit(n) => ValueF::DoubleLit(*n), - ValueF::EmptyOptionalLit(tth) => { - ValueF::EmptyOptionalLit(tth.subst_shift(var, val)) - } - ValueF::NEOptionalLit(th) => { - ValueF::NEOptionalLit(th.subst_shift(var, val)) - } - ValueF::EmptyListLit(tth) => { - ValueF::EmptyListLit(tth.subst_shift(var, val)) - } - ValueF::NEListLit(elts) => { - ValueF::NEListLit(elts.subst_shift(var, val)) - } - ValueF::RecordLit(kvs) => { - ValueF::RecordLit(kvs.subst_shift(var, val)) - } - ValueF::RecordType(kvs) => { - ValueF::RecordType(kvs.subst_shift(var, val)) - } - ValueF::UnionType(kts) => { - ValueF::UnionType(kts.subst_shift(var, val)) - } - ValueF::UnionConstructor(x, kts) => { - ValueF::UnionConstructor(x.clone(), kts.subst_shift(var, val)) - } - ValueF::UnionLit(x, v, kts) => ValueF::UnionLit( - x.clone(), - v.subst_shift(var, val), - kts.subst_shift(var, val), - ), - ValueF::Equivalence(x, y) => ValueF::Equivalence( - x.subst_shift(var, val), - y.subst_shift(var, val), - ), - } - } -} |