class Lean.ToExpr (α : Type u) : Type u

We use the ToExpr type class to convert values of type α into expressions that denote these values in Lean.

Examples:

toExpr true = .const ``Bool.true []

toTypeExpr Bool = .const ``Bool []

See also ToLevel for representing universe levels as Level expressions.

• toExpr : α → Expr

  Convert a value a : α into an expression that denotes a

• toTypeExpr : Expr

  Expression representing the type α

instance Lean.instToExprNat : ToExpr Nat

Equations

• Lean.instToExprNat = { toExpr := Lean.mkNatLit, toTypeExpr := Lean.mkConst `Nat }

instance Lean.instToExprInt : ToExpr Int

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def Lean.instToExprInt.mkNat (n : Nat) : Expr

Equations

• Lean.instToExprInt.mkNat n = Lean.mkApp3 (Lean.Expr.const `OfNat.ofNat [0]) (Lean.Expr.const `Int []) (Lean.mkRawNatLit n) ((Lean.Expr.const `instOfNat []).app (Lean.mkRawNatLit n))

instance Lean.instToExprFin {n : Nat} : ToExpr (Fin n)

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instance Lean.instToExprBitVec {n : Nat} : ToExpr (BitVec n)

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instance Lean.instToExprUInt8 : ToExpr UInt8

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instance Lean.instToExprUInt16 : ToExpr UInt16

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instance Lean.instToExprUInt32 : ToExpr UInt32

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instance Lean.instToExprUInt64 : ToExpr UInt64

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instance Lean.instToExprUSize : ToExpr USize

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instance Lean.instToExprBool : ToExpr Bool

Equations

• Lean.instToExprBool = { toExpr := fun (b : Bool) => if b = true then Lean.mkConst `Bool.true else Lean.mkConst `Bool.false, toTypeExpr := Lean.mkConst `Bool }

instance Lean.instToExprChar : ToExpr Char

Equations

• Lean.instToExprChar = { toExpr := fun (c : Char) => Lean.mkApp (Lean.mkConst `Char.ofNat) (Lean.mkRawNatLit c.toNat), toTypeExpr := Lean.mkConst `Char }

instance Lean.instToExprString : ToExpr String

Equations

• Lean.instToExprString = { toExpr := Lean.mkStrLit, toTypeExpr := Lean.mkConst `String }

instance Lean.instToExprUnit : ToExpr Unit

Equations

• Lean.instToExprUnit = { toExpr := fun (x : Unit) => Lean.mkConst `Unit.unit, toTypeExpr := Lean.mkConst `Unit }

instance Lean.instToExprFilePath : ToExpr System.FilePath

Equations

• Lean.instToExprFilePath = { toExpr := fun (p : System.FilePath) => Lean.mkApp (Lean.mkConst `System.FilePath.mk) (Lean.toExpr p.toString), toTypeExpr := Lean.mkConst `System.FilePath }

instance Lean.instToExprName : ToExpr Name

Equations

• Lean.instToExprName = { toExpr := Lean.Name.toExprAux✝, toTypeExpr := Lean.mkConst `Lean.Name }

instance Lean.instToExprOptionOfToLevel {α : Type u} [ToLevel] [ToExpr α] : ToExpr (Option α)

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instance Lean.instToExprListOfToLevel {α : Type u} [ToLevel] [ToExpr α] : ToExpr (List α)

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instance Lean.instToExprArrayOfToLevel {α : Type u} [ToLevel] [ToExpr α] : ToExpr (Array α)

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instance Lean.instToExprProdOfToLevel {α : Type u} {β : Type v} [ToLevel] [ToLevel] [ToExpr α] [ToExpr β] : ToExpr (α × β)

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instance Lean.instToExprLiteral : ToExpr Literal

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instance Lean.instToExprFVarId : ToExpr FVarId

Equations

• Lean.instToExprFVarId = { toExpr := fun (fvarId : Lean.FVarId) => Lean.mkApp (Lean.mkConst `Lean.FVarId.mk) (Lean.toExpr fvarId.name), toTypeExpr := Lean.mkConst `Lean.FVarId }

instance Lean.instToExprPreresolved : ToExpr Syntax.Preresolved

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def Lean.Expr.toCtorIfLit : Expr → Expr

Equations

• (Lean.Expr.lit (Lean.Literal.natVal v)).toCtorIfLit = if (v == 0) = true then Lean.mkConst `Nat.zero else Lean.mkApp (Lean.mkConst `Nat.succ) (Lean.mkRawNatLit (v - 1))
• (Lean.Expr.lit (Lean.Literal.strVal v)).toCtorIfLit = Lean.mkApp (Lean.mkConst `String.mk) (Lean.toExpr v.toList)
• x✝.toCtorIfLit = x✝