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Basic.lean
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Basic.lean
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/-
Copyright (c) 2021 Jannis Limperg. All rights reserved.
Released under Apache 2.0 license as described in the file LICENSE.
Authors: Jannis Limperg
-/
import Aesop.ElabM
import Aesop.Rule.Name
import Aesop.RuleSet.Member
import Aesop.RuleTac.ElabRuleTerm
open Lean Lean.Meta Lean.Elab.Term
namespace Aesop
/--
Options for the builders. Most options are only relevant for certain builders.
-/
structure RuleBuilderOptions where
immediatePremises? : Option (Array Name)
indexingMode? : Option IndexingMode
casesPatterns? : Option (Array CasesPattern)
pattern? : Option Term
/-- The transparency used by the rule tactic. -/
transparency? : Option TransparencyMode
/-- The transparency used for indexing the rule. Currently, the rule is not
indexed unless this is `.reducible`. -/
indexTransparency? : Option TransparencyMode
deriving Inhabited
namespace RuleBuilderOptions
protected def default : RuleBuilderOptions :=
⟨none, none, none, none, none, none⟩
instance : EmptyCollection RuleBuilderOptions :=
⟨.default⟩
end RuleBuilderOptions
structure CoreRuleBuilderOutput where
ruleExprName : Name
builderName : BuilderName
scopeName : ScopeName
tac : RuleTacDescr
indexingMode : IndexingMode
pattern? : Option RulePattern
inductive PhaseSpec
| safe (info : SafeRuleInfo)
| norm (info : NormRuleInfo)
| «unsafe» (info : UnsafeRuleInfo)
deriving Inhabited
namespace PhaseSpec
def phase : PhaseSpec → PhaseName
| safe .. => .safe
| «unsafe» .. => .unsafe
| norm .. => .norm
def toRule (phase : PhaseSpec) (ruleExprName : Name) (builder : BuilderName)
(scope : ScopeName) (tac : RuleTacDescr) (indexingMode : IndexingMode)
(pattern? : Option RulePattern) : BaseRuleSetMember :=
let name := {
name := ruleExprName
phase := phase.phase
builder, scope
}
match phase with
| .safe info => .safeRule {
extra := info
name, indexingMode, pattern?, tac
}
| .unsafe info => .unsafeRule {
extra := info
name, indexingMode, pattern?, tac
}
| .norm info => .normRule {
extra := info
name, indexingMode, pattern?, tac
}
end PhaseSpec
structure RuleBuilderInput where
term : Term
options : RuleBuilderOptions
phase : PhaseSpec
deriving Inhabited
namespace RuleBuilderInput
def phaseName (input : RuleBuilderInput) : PhaseName :=
input.phase.phase
end RuleBuilderInput
abbrev RuleBuilder := RuleBuilderInput → ElabM LocalRuleSetMember
def elabGlobalRuleIdent (builderName : BuilderName) (term : Term) :
TermElabM Name := do
if let some decl ← elabGlobalRuleIdent? term then
return decl
else
throwError "aesop: {builderName} builder: expected '{term}' to be an unambiguous global constant"
def elabInductiveRuleIdent (builderName : BuilderName) (term : Term) :
TermElabM InductiveVal := do
if let some info ← elabInductiveRuleIdent? term then
return info
else
throwError "aesop: {builderName} builder: expected '{term}' to be an inductive type or structure"
inductive ElabRuleTerm
| const (decl : Name)
| term (term : Term) (expr : Expr)
namespace ElabRuleTerm
def expr : ElabRuleTerm → MetaM Expr
| const decl => mkConstWithFreshMVarLevels decl
| term _ e => return e
def scope : ElabRuleTerm → ScopeName
| const .. => .global
| term .. => .local
def name : ElabRuleTerm → MetaM Name
| const decl => return decl
| term _ e => getRuleNameForExpr e
def toRuleTerm : ElabRuleTerm → RuleTerm
| const decl => .const decl
| term t _ => .term t
def ofElaboratedTerm (tm : Term) (expr : Expr) : ElabRuleTerm :=
if let some decl := expr.constName? then
.const decl
else
.term tm expr
end Aesop.ElabRuleTerm