If cond
is true, wraps the syntax produced by d
in a type ascription.
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Wraps the identifier (or identifier with explicit universe levels) with @
if pp.analysis.blockImplicit
is set to true.
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Delaborator for const
expressions.
This is not registered as a delaborator, as const
is not an expression kind
(see [delab] description and Lean.PrettyPrinter.Delaborator.getExprKind
).
Rather, it is called through the app
delaborator.
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A structure that records details of a function parameter.
- name : Lean.Name
Binder name for the parameter.
- bInfo : Lean.BinderInfo
Binder info for the parameter.
The default value for the parameter, if the parameter has a default value.
- isAutoParam : Bool
Whether the parameter is an autoparam (i.e., whether it uses a tactic for the default value).
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- Lean.PrettyPrinter.Delaborator.instInhabitedParamKind = { default := { name := default, bInfo := default, defVal := default, isAutoParam := default } }
Returns true if the parameter is an explicit parameter that has neither a default value nor a tactic.
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Given a function f
supplied with arguments args
, returns an array whose n-th element
is set to the kind of the n-th argument's associated parameter.
We do not assume the expression mkAppN f args
is sensical,
and this function captures errors (except for panics) and returns the empty array in that case.
The returned array might be longer than the number of arguments.
It gives parameter kinds for the fully-applied function.
Note: the defVal
expressions are only guaranteed to be valid for parameters associated to the supplied arguments;
after this, they might refer to temporary fvars.
This function properly handles "overapplied" functions.
For example, while id
takes one explicit argument, it can take more than one explicit
argument when its arguments are specialized to function types, like in id id 2
.
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Takes application syntax and converts it into structure instance notation, if possible. Assumes that the application is pretty printed in implicit mode.
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If e
is an application that is a candidate for using field notation,
returns the parameter index and the field name to use.
Checks that there are enough arguments.
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In explicit mode, decides whether or not the applied function needs @
,
where numArgs
is the number of arguments actually supplied to f
.
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Delaborates a function application in explicit mode.
- If
insertExplicit
is true, then ensures the head syntax is wrapped with@
. - If
fieldNotation
is true, then allows the application to be pretty printed using field notation. Field notation will not be used wheninsertExplicit
is true.
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Records how a particular argument to a function is delaborated, in non-explicit mode.
- skip: Lean.PrettyPrinter.Delaborator.AppImplicitArg
An argument to skip, like an implicit argument.
- regular: Lean.Term → Lean.PrettyPrinter.Delaborator.AppImplicitArg
A regular argument.
- optional: Lean.Name → Lean.Term → Lean.PrettyPrinter.Delaborator.AppImplicitArg
A regular argument that, if it comes as the last argument, may be omitted.
- named: Lean.TSyntax `Lean.Parser.Term.namedArgument → Lean.PrettyPrinter.Delaborator.AppImplicitArg
It's a named argument. Named arguments inhibit applying unexpanders.
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Whether unexpanding is allowed with this argument.
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- (Lean.PrettyPrinter.Delaborator.AppImplicitArg.regular s).canUnexpand = true
- (Lean.PrettyPrinter.Delaborator.AppImplicitArg.optional name s).canUnexpand = true
- Lean.PrettyPrinter.Delaborator.AppImplicitArg.skip.canUnexpand = true
- (Lean.PrettyPrinter.Delaborator.AppImplicitArg.named s).canUnexpand = false
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If the argument has associated syntax, returns it.
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- Lean.PrettyPrinter.Delaborator.AppImplicitArg.skip.syntax? = none
- (Lean.PrettyPrinter.Delaborator.AppImplicitArg.regular s).syntax? = some s.raw
- (Lean.PrettyPrinter.Delaborator.AppImplicitArg.optional name s).syntax? = some s.raw
- (Lean.PrettyPrinter.Delaborator.AppImplicitArg.named s).syntax? = some s.raw
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Delaborates a function application in the standard mode, where implicit arguments are generally not
included, unless pp.analysis.namedArg
is set at that argument.
This delaborator is where app_unexpander
s and the structure instance unexpander are applied, if unexpand
is true.
When unexpand
is true, also considers opportunities for field notation, which takes priority over other unexpanders.
Assumes numArgs ≤ paramKinds.size
.
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Delaborates the current argument.
The argument remainingArgs
is the number of arguments in the application after this one.
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Runs the given unexpanders, returning the resulting syntax if any are applicable, and otherwise fails.
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If the expression is a candidate for app unexpanders, try applying an app unexpander using some prefix of the arguments, longest prefix first. This function makes sure that the unexpanded syntax is annotated and given TermInfo so that it is hoverable in the InfoView.
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Returns true if an application should use explicit mode when delaborating. Explicit mode turns off unexpanders
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Delaborates applications. Removes up to maxArgs
arguments to form the "head" of the application.
delabHead
is a delaborator to use for the head of the expression. It is passed whether the result needs to have@
inserted.- If
unexpand
is true, then allow unexpanders and field notation. This should likely be set tofalse
except in the maindelabApp
delaborator.
Propagates pp.tagAppFns
into the head for delabHead
.
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Default delaborator for applications.
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The withOverApp
combinator allows delaborators to handle "over-application" by using the core
application delaborator to handle additional arguments.
For example, suppose f : {A : Type} → Foo A → A
and we want to implement a delaborator for
applications f x
to pretty print as F[x]
. Because A
is a type variable we might encounter
a term of the form @f (A → B) x y
, which has an additional argument y
.
With this combinator one can use an arity-2 delaborator to pretty print this as F[x] y
.
arity
: the expected number of arguments tof
. The combinator will fail if fewer than this number of arguments are passed, and if more than this number of arguments are passed the arguments are handled using the standard application delaborator.x
: delaborates the head application of the expected arity (f x
in the example). The value ofpp.tagAppFns
for the whole application is propagated to the expression thatx
sees.
In the event of overapplication, the delaborator x
is wrapped in
Lean.PrettyPrinter.Delaborator.withAnnotateTermInfo
to register TermInfo
for the resulting term.
The effect of this is that the term is hoverable in the Infoview.
If the application would require inserting @
around the result of x
, the delaborator fails
since we cannot be sure that this insertion will be well-formed.
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State for delabAppMatch
and helpers.
- info : Lean.Meta.MatcherInfo
- matcherTy : Lean.SubExpr
The
matcherTy
instantiated with universe levels and the matcher parameters, with a position at the type of this application prefix. The motive, with the pi type version delaborated and the original expression version. Once
AppMatchState
is complete, this is notnone
.- motiveNamed : Bool
Whether
pp.analysis.namedArg
was set for the motive argument. The delaborated discriminants, without
h :
annotations.The collection of names used for the
h :
discriminant annotations, in order. Uniquified names are constructed after the first phase.- alts : Array Lean.SubExpr
Lambda subexpressions for each alternate.
For each match alternative, the names to use for the pattern variables. Each ends with
hNames?.filterMap id
exactly.The delaborated right-hand sides for each match alternative.
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Adds hNames to the local context to reserve their names and runs m
in that context.
Delaborates applications of the form letFun v (fun x => b)
as let_fun x := v; b
.
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Core function that delaborates a natural number (an OfNat.ofNat
literal).
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Core function that delaborates a negative integer literal (a Neg.neg
applied to OfNat.ofNat
).
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Core function that delaborates a rational literal that is the division of an integer literal by a natural number literal. The division must be homogeneous for it to count as a rational literal.
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Delaborates an OfNat.ofNat
literal.
@OfNat.ofNat _ n _
~> n
.
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Delaborates the negative of an OfNat.ofNat
literal.
-@OfNat.ofNat _ n _
~> -n
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Delaborates a rational number literal.
@OfNat.ofNat _ n _ / @OfNat.ofNat _ m
~> n / m
and -@OfNat.ofNat _ n _ / @OfNat.ofNat _ m
~> -n / m
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Delaborate a projection primitive. These do not usually occur in
user code, but are pretty-printed when e.g. #print
ing a projection
function.
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This delaborator tries to elide functions which are known coercions.
For example, Int.ofNat
is a coercion, so instead of printing ofNat n
we just print ↑n
,
and when re-parsing this we can (usually) recover the specific coercion being used.
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Delaborates a function application of the form f ... x (fun _ : Unit => y)
.
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Pretty-prints a constant c
as c.{<levels>} <params> : <type>
.
If universes
is false
, then the universe level parameters are omitted.
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For types in the signature, we want to be sure pi binder types are pretty printed.
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Inner loop for delabParams
, collecting binders.
Invariants:
- The current expression is a forall.
- It has a name that's not inaccessible.
- It has a name that hasn't been used yet.
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Go through rest of type, alpha renaming and setting options along the spine.