def Lean.NameMapExtension (α : Type) : Type

Maps declaration names to α.

instance Lean.instInhabitedNameMapExtension {α : Type} : Inhabited (NameMapExtension α)

def Lean.NameMapExtension.find? {α : Type} (ext : NameMapExtension α) (env : Environment) : Name → Option α

Look up a value in the given extension in the environment.

def Lean.NameMapExtension.add {M : Type → Type} {α : Type} [Monad M] [MonadEnv M] [MonadError M] (ext : NameMapExtension α) (k : Name) (v : α) : M Unit

Add the given k,v pair to the NameMapExtension.

def Lean.registerNameMapExtension (α : Type) (name : Name := by exact decl_name%) : IO (NameMapExtension α)

Registers a new extension with the given name and type.

structure Lean.NameMapAttributeImpl (α : Type) : Type

The inputs to registerNameMapAttribute.

• name : Name

  The name of the attribute

• ref : Name

  The declaration which creates the attribute

• descr : String

  The description of the attribute

• add (src : Name) (stx : Syntax) : AttrM α

  This function is called when the attribute is applied. It should produce a value of type α from the given attribute syntax.

instance Lean.instInhabitedNameMapAttributeImpl {a✝ : Type} : Inhabited (NameMapAttributeImpl a✝)

def Lean.registerNameMapAttribute {α : Type} (impl : NameMapAttributeImpl α) : IO (NameMapExtension α)

Similar to registerParametricAttribute except that attributes do not have to be assigned in the same file as the declaration.