Private name support.

Suppose the user marks as declaration n as private. Then, we create the name: _private.<module_name>.0 ++ n. We say _private.<module_name>.0 is the "private prefix"

We assume that n is a valid user name and does not contain Name.num constructors. Thus, we can easily convert from private internal name to the user given name.

def Lean.privateHeader : Name

Equations

• Lean.privateHeader = `_private

def Lean.mkPrivateNameCore (mainModule n : Name) : Name

Equations

• Lean.mkPrivateNameCore mainModule n = (Lean.privateHeader ++ mainModule).mkNum 0 ++ n

def Lean.isPrivateName : Name → Bool

Equations

• Lean.isPrivateName (p.str str) = (p.str str == Lean.privateHeader || Lean.isPrivateName p)
• Lean.isPrivateName (p.num i) = Lean.isPrivateName p
• Lean.isPrivateName x✝ = false

def Lean.isPrivatePrefix (n : Name) : Bool

Return true if n is of the form _private.<module_name>.0 See comment above.

Equations

• Lean.isPrivatePrefix (p.num 0) = Lean.isPrivatePrefix.go✝ p
• Lean.isPrivatePrefix n = false

def Lean.privateToUserName? (n : Name) : Option Name

Equations

• Lean.privateToUserName? n = if Lean.isPrivateName n = true then some (Lean.privateToUserNameAux✝ n) else none

def Lean.privateToUserName (n : Name) : Name

Equations

• Lean.privateToUserName n = if Lean.isPrivateName n = true then Lean.privateToUserNameAux✝ n else n

def Lean.privatePrefix? (n : Name) : Option Name

Equations

• Lean.privatePrefix? n = if Lean.isPrivateName n = true then some (Lean.privatePrefixAux✝ n) else none