src/Pure/Isar/isar_syn.ML

support for "if prems" in local goal statements;

(*  Title:      Pure/Isar/isar_syn.ML
    Author:     Makarius

Outer syntax for Isabelle/Pure.
*)

structure Isar_Syn: sig end =
struct

(** theory commands **)

(* sorts *)

val _ =
  Outer_Syntax.local_theory @{command_keyword default_sort}
    "declare default sort for explicit type variables"
    (Parse.sort >> (fn s => fn lthy => Local_Theory.set_defsort (Syntax.read_sort lthy s) lthy));


(* types *)

val _ =
  Outer_Syntax.local_theory @{command_keyword typedecl} "type declaration"
    (Parse.type_args -- Parse.binding -- Parse.opt_mixfix
      >> (fn ((args, a), mx) => Typedecl.typedecl (a, map (rpair dummyS) args, mx) #> snd));

val _ =
  Outer_Syntax.local_theory @{command_keyword type_synonym} "declare type abbreviation"
    (Parse.type_args -- Parse.binding --
      (@{keyword "="} |-- Parse.!!! (Parse.typ -- Parse.opt_mixfix'))
      >> (fn ((args, a), (rhs, mx)) => snd o Typedecl.abbrev_cmd (a, args, mx) rhs));

val _ =
  Outer_Syntax.command @{command_keyword nonterminal}
    "declare syntactic type constructors (grammar nonterminal symbols)"
    (Parse.and_list1 Parse.binding >> (Toplevel.theory o Sign.add_nonterminals_global));


(* consts and syntax *)

val _ =
  Outer_Syntax.command @{command_keyword judgment} "declare object-logic judgment"
    (Parse.const_binding >> (Toplevel.theory o Object_Logic.add_judgment_cmd));

val _ =
  Outer_Syntax.command @{command_keyword consts} "declare constants"
    (Scan.repeat1 Parse.const_binding >> (Toplevel.theory o Sign.add_consts_cmd));

val mode_spec =
  (@{keyword "output"} >> K ("", false)) ||
    Parse.name -- Scan.optional (@{keyword "output"} >> K false) true;

val opt_mode =
  Scan.optional (@{keyword "("} |-- Parse.!!! (mode_spec --| @{keyword ")"})) Syntax.mode_default;

val _ =
  Outer_Syntax.command @{command_keyword syntax} "add raw syntax clauses"
    (opt_mode -- Scan.repeat1 Parse.const_decl
      >> (Toplevel.theory o uncurry Sign.add_syntax_cmd));

val _ =
  Outer_Syntax.command @{command_keyword no_syntax} "delete raw syntax clauses"
    (opt_mode -- Scan.repeat1 Parse.const_decl
      >> (Toplevel.theory o uncurry Sign.del_syntax_cmd));


(* translations *)

val trans_pat =
  Scan.optional
    (@{keyword "("} |-- Parse.!!! (Parse.inner_syntax Parse.xname --| @{keyword ")"})) "logic"
    -- Parse.inner_syntax Parse.string;

fun trans_arrow toks =
  ((@{keyword "\<rightharpoonup>"} || @{keyword "=>"}) >> K Syntax.Parse_Rule ||
    (@{keyword "\<leftharpoondown>"} || @{keyword "<="}) >> K Syntax.Print_Rule ||
    (@{keyword "\<rightleftharpoons>"} || @{keyword "=="}) >> K Syntax.Parse_Print_Rule) toks;

val trans_line =
  trans_pat -- Parse.!!! (trans_arrow -- trans_pat)
    >> (fn (left, (arr, right)) => arr (left, right));

val _ =
  Outer_Syntax.command @{command_keyword translations} "add syntax translation rules"
    (Scan.repeat1 trans_line >> (Toplevel.theory o Isar_Cmd.translations));

val _ =
  Outer_Syntax.command @{command_keyword no_translations} "delete syntax translation rules"
    (Scan.repeat1 trans_line >> (Toplevel.theory o Isar_Cmd.no_translations));


(* axioms and definitions *)

val opt_unchecked_overloaded =
  Scan.optional (@{keyword "("} |-- Parse.!!!
    (((@{keyword "unchecked"} >> K true) --
        Scan.optional (@{keyword "overloaded"} >> K true) false ||
      @{keyword "overloaded"} >> K (false, true)) --| @{keyword ")"})) (false, false);

val _ =
  Outer_Syntax.command @{command_keyword defs} "define constants"
    (opt_unchecked_overloaded --
      Scan.repeat1 (Parse_Spec.thm_name ":" -- Parse.prop >> (fn ((x, y), z) => ((x, z), y)))
      >> (Toplevel.theory o Isar_Cmd.add_defs));


(* constant definitions and abbreviations *)

val _ =
  Outer_Syntax.local_theory' @{command_keyword definition} "constant definition"
    (Parse_Spec.constdef >> (fn args => #2 oo Specification.definition_cmd args));

val _ =
  Outer_Syntax.local_theory' @{command_keyword abbreviation} "constant abbreviation"
    (opt_mode -- (Scan.option Parse_Spec.constdecl -- Parse.prop)
      >> (fn (mode, args) => Specification.abbreviation_cmd mode args));

val _ =
  Outer_Syntax.local_theory @{command_keyword type_notation}
    "add concrete syntax for type constructors"
    (opt_mode -- Parse.and_list1 (Parse.type_const -- Parse.mixfix)
      >> (fn (mode, args) => Specification.type_notation_cmd true mode args));

val _ =
  Outer_Syntax.local_theory @{command_keyword no_type_notation}
    "delete concrete syntax for type constructors"
    (opt_mode -- Parse.and_list1 (Parse.type_const -- Parse.mixfix)
      >> (fn (mode, args) => Specification.type_notation_cmd false mode args));

val _ =
  Outer_Syntax.local_theory @{command_keyword notation}
    "add concrete syntax for constants / fixed variables"
    (opt_mode -- Parse.and_list1 (Parse.const -- Parse.mixfix)
      >> (fn (mode, args) => Specification.notation_cmd true mode args));

val _ =
  Outer_Syntax.local_theory @{command_keyword no_notation}
    "delete concrete syntax for constants / fixed variables"
    (opt_mode -- Parse.and_list1 (Parse.const -- Parse.mixfix)
      >> (fn (mode, args) => Specification.notation_cmd false mode args));


(* constant specifications *)

val _ =
  Outer_Syntax.command @{command_keyword axiomatization} "axiomatic constant specification"
    (Scan.optional Parse.fixes [] --
      Scan.optional (Parse.where_ |-- Parse.!!! (Parse.and_list1 Parse_Spec.specs)) []
      >> (fn (x, y) => Toplevel.theory (#2 o Specification.axiomatization_cmd x y)));


(* theorems *)

fun theorems kind =
  Parse_Spec.name_facts -- Parse.for_fixes
    >> (fn (facts, fixes) => #2 oo Specification.theorems_cmd kind facts fixes);

val _ =
  Outer_Syntax.local_theory' @{command_keyword theorems} "define theorems"
    (theorems Thm.theoremK);

val _ =
  Outer_Syntax.local_theory' @{command_keyword lemmas} "define lemmas" (theorems Thm.lemmaK);

val _ =
  Outer_Syntax.local_theory' @{command_keyword declare} "declare theorems"
    (Parse.and_list1 Parse.xthms1 -- Parse.for_fixes
      >> (fn (facts, fixes) =>
          #2 oo Specification.theorems_cmd "" [(Attrib.empty_binding, flat facts)] fixes));


(* hide names *)

local

fun hide_names command_keyword what hide parse prep =
  Outer_Syntax.command command_keyword ("hide " ^ what ^ " from name space")
    ((Parse.opt_keyword "open" >> not) -- Scan.repeat1 parse >> (fn (fully, args) =>
      (Toplevel.theory (fn thy =>
        let val ctxt = Proof_Context.init_global thy
        in fold (hide fully o prep ctxt) args thy end))));

in

val _ =
  hide_names @{command_keyword hide_class} "classes" Sign.hide_class Parse.class
    Proof_Context.read_class;

val _ =
  hide_names @{command_keyword hide_type} "types" Sign.hide_type Parse.type_const
    ((#1 o dest_Type) oo Proof_Context.read_type_name {proper = true, strict = false});

val _ =
  hide_names @{command_keyword hide_const} "constants" Sign.hide_const Parse.const
    ((#1 o dest_Const) oo Proof_Context.read_const {proper = true, strict = false});

val _ =
  hide_names @{command_keyword hide_fact} "facts" Global_Theory.hide_fact
    (Parse.position Parse.xname) (Global_Theory.check_fact o Proof_Context.theory_of);

end;


(* use ML text *)

val _ =
  Outer_Syntax.command @{command_keyword SML_file} "read and evaluate Standard ML file"
    (Resources.provide_parse_files "SML_file" >> (fn files => Toplevel.theory (fn thy =>
        let
          val ([{lines, pos, ...}], thy') = files thy;
          val source = Input.source true (cat_lines lines) (pos, pos);
          val flags = {SML = true, exchange = false, redirect = true, verbose = true};
        in
          thy' |> Context.theory_map
            (ML_Context.exec (fn () => ML_Context.eval_source flags source))
        end)));

val _ =
  Outer_Syntax.command @{command_keyword SML_export} "evaluate SML within Isabelle/ML environment"
    (Parse.ML_source >> (fn source =>
      let val flags = {SML = true, exchange = true, redirect = false, verbose = true} in
        Toplevel.theory
          (Context.theory_map (ML_Context.exec (fn () => ML_Context.eval_source flags source)))
      end));

val _ =
  Outer_Syntax.command @{command_keyword SML_import} "evaluate Isabelle/ML within SML environment"
    (Parse.ML_source >> (fn source =>
      let val flags = {SML = false, exchange = true, redirect = false, verbose = true} in
        Toplevel.generic_theory
          (ML_Context.exec (fn () => ML_Context.eval_source flags source) #>
            Local_Theory.propagate_ml_env)
      end));

val _ =
  Outer_Syntax.command @{command_keyword ML} "ML text within theory or local theory"
    (Parse.ML_source >> (fn source =>
      Toplevel.generic_theory
        (ML_Context.exec (fn () =>
            ML_Context.eval_source (ML_Compiler.verbose true ML_Compiler.flags) source) #>
          Local_Theory.propagate_ml_env)));

val _ =
  Outer_Syntax.command @{command_keyword ML_prf} "ML text within proof"
    (Parse.ML_source >> (fn source =>
      Toplevel.proof (Proof.map_context (Context.proof_map
        (ML_Context.exec (fn () =>
            ML_Context.eval_source (ML_Compiler.verbose true ML_Compiler.flags) source))) #>
          Proof.propagate_ml_env)));

val _ =
  Outer_Syntax.command @{command_keyword ML_val} "diagnostic ML text"
    (Parse.ML_source >> Isar_Cmd.ml_diag true);

val _ =
  Outer_Syntax.command @{command_keyword ML_command} "diagnostic ML text (silent)"
    (Parse.ML_source >> Isar_Cmd.ml_diag false);

val _ =
  Outer_Syntax.command @{command_keyword setup} "ML setup for global theory"
    (Parse.ML_source >> (Toplevel.theory o Isar_Cmd.setup));

val _ =
  Outer_Syntax.local_theory @{command_keyword local_setup} "ML setup for local theory"
    (Parse.ML_source >> Isar_Cmd.local_setup);

val _ =
  Outer_Syntax.local_theory @{command_keyword attribute_setup} "define attribute in ML"
    (Parse.position Parse.name --
        Parse.!!! (@{keyword "="} |-- Parse.ML_source -- Scan.optional Parse.text "")
      >> (fn (name, (txt, cmt)) => Attrib.attribute_setup name txt cmt));

val _ =
  Outer_Syntax.local_theory @{command_keyword method_setup} "define proof method in ML"
    (Parse.position Parse.name --
        Parse.!!! (@{keyword "="} |-- Parse.ML_source -- Scan.optional Parse.text "")
      >> (fn (name, (txt, cmt)) => Method.method_setup name txt cmt));

val _ =
  Outer_Syntax.local_theory @{command_keyword declaration} "generic ML declaration"
    (Parse.opt_keyword "pervasive" -- Parse.ML_source
      >> (fn (pervasive, txt) => Isar_Cmd.declaration {syntax = false, pervasive = pervasive} txt));

val _ =
  Outer_Syntax.local_theory @{command_keyword syntax_declaration} "generic ML syntax declaration"
    (Parse.opt_keyword "pervasive" -- Parse.ML_source
      >> (fn (pervasive, txt) => Isar_Cmd.declaration {syntax = true, pervasive = pervasive} txt));

val _ =
  Outer_Syntax.local_theory @{command_keyword simproc_setup} "define simproc in ML"
    (Parse.position Parse.name --
      (@{keyword "("} |-- Parse.enum1 "|" Parse.term --| @{keyword ")"} --| @{keyword "="}) --
      Parse.ML_source -- Scan.optional (@{keyword "identifier"} |-- Scan.repeat1 Parse.xname) []
    >> (fn (((a, b), c), d) => Isar_Cmd.simproc_setup a b c d));


(* translation functions *)

val _ =
  Outer_Syntax.command @{command_keyword parse_ast_translation}
    "install parse ast translation functions"
    (Parse.ML_source >> (Toplevel.theory o Isar_Cmd.parse_ast_translation));

val _ =
  Outer_Syntax.command @{command_keyword parse_translation}
    "install parse translation functions"
    (Parse.ML_source >> (Toplevel.theory o Isar_Cmd.parse_translation));

val _ =
  Outer_Syntax.command @{command_keyword print_translation}
    "install print translation functions"
    (Parse.ML_source >> (Toplevel.theory o Isar_Cmd.print_translation));

val _ =
  Outer_Syntax.command @{command_keyword typed_print_translation}
    "install typed print translation functions"
    (Parse.ML_source >> (Toplevel.theory o Isar_Cmd.typed_print_translation));

val _ =
  Outer_Syntax.command @{command_keyword print_ast_translation}
    "install print ast translation functions"
    (Parse.ML_source >> (Toplevel.theory o Isar_Cmd.print_ast_translation));


(* oracles *)

val _ =
  Outer_Syntax.command @{command_keyword oracle} "declare oracle"
    (Parse.range Parse.name -- (@{keyword "="} |-- Parse.ML_source) >>
      (fn (x, y) => Toplevel.theory (Isar_Cmd.oracle x y)));


(* bundled declarations *)

val _ =
  Outer_Syntax.local_theory @{command_keyword bundle} "define bundle of declarations"
    ((Parse.binding --| @{keyword "="}) -- Parse.xthms1 -- Parse.for_fixes
      >> (uncurry Bundle.bundle_cmd));

val _ =
  Outer_Syntax.command @{command_keyword include}
    "include declarations from bundle in proof body"
    (Scan.repeat1 (Parse.position Parse.xname) >> (Toplevel.proof o Bundle.include_cmd));

val _ =
  Outer_Syntax.command @{command_keyword including}
    "include declarations from bundle in goal refinement"
    (Scan.repeat1 (Parse.position Parse.xname) >> (Toplevel.proof o Bundle.including_cmd));

val _ =
  Outer_Syntax.command @{command_keyword print_bundles}
    "print bundles of declarations"
    (Parse.opt_bang >> (fn b => Toplevel.keep (Bundle.print_bundles b o Toplevel.context_of)));


(* local theories *)

val _ =
  Outer_Syntax.command @{command_keyword context} "begin local theory context"
    ((Parse.position Parse.xname >> (fn name =>
        Toplevel.begin_local_theory true (Named_Target.begin name)) ||
      Scan.optional Parse_Spec.includes [] -- Scan.repeat Parse_Spec.context_element
        >> (fn (incls, elems) => Toplevel.open_target (#2 o Bundle.context_cmd incls elems)))
      --| Parse.begin);


(* locales *)

val locale_val =
  Parse_Spec.locale_expression false --
    Scan.optional (@{keyword "+"} |-- Parse.!!! (Scan.repeat1 Parse_Spec.context_element)) [] ||
  Scan.repeat1 Parse_Spec.context_element >> pair ([], []);

val _ =
  Outer_Syntax.command @{command_keyword locale} "define named specification context"
    (Parse.binding --
      Scan.optional (@{keyword "="} |-- Parse.!!! locale_val) (([], []), []) -- Parse.opt_begin
      >> (fn ((name, (expr, elems)), begin) =>
          Toplevel.begin_local_theory begin
            (Expression.add_locale_cmd name Binding.empty expr elems #> snd)));

val _ =
  Outer_Syntax.command @{command_keyword experiment} "open private specification context"
    (Scan.repeat Parse_Spec.context_element --| Parse.begin
      >> (fn elems =>
          Toplevel.begin_local_theory true (Experiment.experiment_cmd elems #> snd)));

fun interpretation_args mandatory =
  Parse.!!! (Parse_Spec.locale_expression mandatory) --
    Scan.optional
      (Parse.where_ |-- Parse.and_list1 (Parse_Spec.opt_thm_name ":" -- Parse.prop)) [];

val _ =
  Outer_Syntax.command @{command_keyword sublocale}
    "prove sublocale relation between a locale and a locale expression"
    ((Parse.position Parse.xname --| (@{keyword "\<subseteq>"} || @{keyword "<"}) --
      interpretation_args false >> (fn (loc, (expr, equations)) =>
        Toplevel.theory_to_proof (Expression.sublocale_global_cmd loc expr equations)))
    || interpretation_args false >> (fn (expr, equations) =>
        Toplevel.local_theory_to_proof NONE NONE (Expression.sublocale_cmd expr equations)));

val _ =
  Outer_Syntax.command @{command_keyword interpretation}
    "prove interpretation of locale expression in local theory"
    (interpretation_args true >> (fn (expr, equations) =>
      Toplevel.local_theory_to_proof NONE NONE (Expression.interpretation_cmd expr equations)));

val _ =
  Outer_Syntax.command @{command_keyword interpret}
    "prove interpretation of locale expression in proof context"
    (interpretation_args true >> (fn (expr, equations) =>
      Toplevel.proof' (Expression.interpret_cmd expr equations)));


(* classes *)

val class_val =
  Parse_Spec.class_expression --
    Scan.optional (@{keyword "+"} |-- Parse.!!! (Scan.repeat1 Parse_Spec.context_element)) [] ||
  Scan.repeat1 Parse_Spec.context_element >> pair [];

val _ =
  Outer_Syntax.command @{command_keyword class} "define type class"
   (Parse.binding -- Scan.optional (@{keyword "="} |-- class_val) ([], []) -- Parse.opt_begin
    >> (fn ((name, (supclasses, elems)), begin) =>
        Toplevel.begin_local_theory begin
          (Class_Declaration.class_cmd name supclasses elems #> snd)));

val _ =
  Outer_Syntax.local_theory_to_proof @{command_keyword subclass} "prove a subclass relation"
    (Parse.class >> Class_Declaration.subclass_cmd);

val _ =
  Outer_Syntax.command @{command_keyword instantiation} "instantiate and prove type arity"
   (Parse.multi_arity --| Parse.begin
     >> (fn arities => Toplevel.begin_local_theory true (Class.instantiation_cmd arities)));

val _ =
  Outer_Syntax.command @{command_keyword instance} "prove type arity or subclass relation"
  ((Parse.class --
    ((@{keyword "\<subseteq>"} || @{keyword "<"}) |-- Parse.!!! Parse.class) >> Class.classrel_cmd ||
    Parse.multi_arity >> Class.instance_arity_cmd) >> Toplevel.theory_to_proof ||
    Scan.succeed (Toplevel.local_theory_to_proof NONE NONE (Class.instantiation_instance I)));


(* arbitrary overloading *)

val _ =
  Outer_Syntax.command @{command_keyword overloading} "overloaded definitions"
   (Scan.repeat1 (Parse.name --| (@{keyword "\<equiv>"} || @{keyword "=="}) -- Parse.term --
      Scan.optional (@{keyword "("} |-- (@{keyword "unchecked"} >> K false) --| @{keyword ")"}) true
      >> Parse.triple1) --| Parse.begin
   >> (fn operations => Toplevel.begin_local_theory true (Overloading.overloading_cmd operations)));


(* code generation *)

val _ =
  Outer_Syntax.command @{command_keyword code_datatype}
    "define set of code datatype constructors"
    (Scan.repeat1 Parse.term >> (Toplevel.theory o Code.add_datatype_cmd));



(** proof commands **)

val _ =
  Outer_Syntax.local_theory_to_proof @{command_keyword notepad} "begin proof context"
    (Parse.begin >> K Proof.begin_notepad);


(* statements *)

fun theorem spec schematic kind =
  Outer_Syntax.local_theory_to_proof' spec
    ("state " ^ (if schematic then "schematic " ^ kind else kind))
    (Scan.optional (Parse_Spec.opt_thm_name ":" --|
      Scan.ahead (Parse_Spec.includes >> K "" ||
        Parse_Spec.locale_keyword || Parse_Spec.statement_keyword)) Attrib.empty_binding --
      Scan.optional Parse_Spec.includes [] --
      Parse_Spec.general_statement >> (fn ((a, includes), (elems, concl)) =>
        ((if schematic then Specification.schematic_theorem_cmd else Specification.theorem_cmd)
          kind NONE (K I) a includes elems concl)));

val _ = theorem @{command_keyword theorem} false Thm.theoremK;
val _ = theorem @{command_keyword lemma} false Thm.lemmaK;
val _ = theorem @{command_keyword corollary} false Thm.corollaryK;
val _ = theorem @{command_keyword schematic_theorem} true Thm.theoremK;
val _ = theorem @{command_keyword schematic_lemma} true Thm.lemmaK;
val _ = theorem @{command_keyword schematic_corollary} true Thm.corollaryK;


val structured_statement =
  Parse_Spec.statement -- Parse_Spec.if_prems -- Parse.for_fixes >> (fn ((a, b), c) => (c, b, a));

val _ =
  Outer_Syntax.command @{command_keyword have} "state local goal"
    (structured_statement >> (fn (fixes, assumes, shows) =>
      Toplevel.proof' (fn int => Proof.have_cmd NONE (K I) fixes assumes shows int)));

val _ =
  Outer_Syntax.command @{command_keyword show} "state local goal, to refine pending subgoals"
    (structured_statement >> (fn (fixes, assumes, shows) =>
      Toplevel.proof' (fn int => Proof.show_cmd NONE (K I) fixes assumes shows int)));

val _ =
  Outer_Syntax.command @{command_keyword hence} "old-style alias of \"then have\""
    (structured_statement >> (fn (fixes, assumes, shows) =>
      Toplevel.proof' (fn int => Proof.chain #> Proof.have_cmd NONE (K I) fixes assumes shows int)));

val _ =
  Outer_Syntax.command @{command_keyword thus} "old-style alias of  \"then show\""
    (structured_statement >> (fn (fixes, assumes, shows) =>
      Toplevel.proof' (fn int => Proof.chain #> Proof.show_cmd NONE (K I) fixes assumes shows int)));


(* facts *)

val facts = Parse.and_list1 Parse.xthms1;

val _ =
  Outer_Syntax.command @{command_keyword then} "forward chaining"
    (Scan.succeed (Toplevel.proof Proof.chain));

val _ =
  Outer_Syntax.command @{command_keyword from} "forward chaining from given facts"
    (facts >> (Toplevel.proof o Proof.from_thmss_cmd));

val _ =
  Outer_Syntax.command @{command_keyword with} "forward chaining from given and current facts"
    (facts >> (Toplevel.proof o Proof.with_thmss_cmd));

val _ =
  Outer_Syntax.command @{command_keyword note} "define facts"
    (Parse_Spec.name_facts >> (Toplevel.proof o Proof.note_thmss_cmd));

val _ =
  Outer_Syntax.command @{command_keyword supply} "define facts during goal refinement (unstructured)"
    (Parse_Spec.name_facts >> (Toplevel.proof o Proof.supply_cmd));

val _ =
  Outer_Syntax.command @{command_keyword using} "augment goal facts"
    (facts >> (Toplevel.proof o Proof.using_cmd));

val _ =
  Outer_Syntax.command @{command_keyword unfolding} "unfold definitions in goal and facts"
    (facts >> (Toplevel.proof o Proof.unfolding_cmd));


(* proof context *)

val _ =
  Outer_Syntax.command @{command_keyword fix} "fix local variables (Skolem constants)"
    (Parse.fixes >> (Toplevel.proof o Proof.fix_cmd));

val _ =
  Outer_Syntax.command @{command_keyword assume} "assume propositions"
    (Parse_Spec.statement >> (Toplevel.proof o Proof.assume_cmd));

val _ =
  Outer_Syntax.command @{command_keyword presume} "assume propositions, to be established later"
    (Parse_Spec.statement >> (Toplevel.proof o Proof.presume_cmd));

val _ =
  Outer_Syntax.command @{command_keyword def} "local definition (non-polymorphic)"
    (Parse.and_list1
      (Parse_Spec.opt_thm_name ":" --
        ((Parse.binding -- Parse.opt_mixfix) --
          ((@{keyword "\<equiv>"} || @{keyword "=="}) |-- Parse.!!! Parse.termp)))
    >> (Toplevel.proof o Proof.def_cmd));

val _ =
  Outer_Syntax.command @{command_keyword obtain} "generalized elimination"
    (Parse.parname -- Scan.optional (Parse.fixes --| Parse.where_) [] -- Parse_Spec.statement
      >> (fn ((x, y), z) => Toplevel.proof' (Obtain.obtain_cmd x y z)));

val _ =
  Outer_Syntax.command @{command_keyword guess} "wild guessing (unstructured)"
    (Scan.optional Parse.fixes [] >> (Toplevel.proof' o Obtain.guess_cmd));

val _ =
  Outer_Syntax.command @{command_keyword let} "bind text variables"
    (Parse.and_list1 (Parse.and_list1 Parse.term -- (@{keyword "="} |-- Parse.term))
      >> (Toplevel.proof o Proof.let_bind_cmd));

val _ =
  Outer_Syntax.command @{command_keyword write} "add concrete syntax for constants / fixed variables"
    (opt_mode -- Parse.and_list1 (Parse.const -- Parse.mixfix)
    >> (fn (mode, args) => Toplevel.proof (Proof.write_cmd mode args)));

val _ =
  Outer_Syntax.command @{command_keyword case} "invoke local context"
    ((@{keyword "("} |--
      Parse.!!! (Parse.position Parse.xname -- Scan.repeat (Parse.maybe Parse.binding)
        --| @{keyword ")"}) ||
      Parse.position Parse.xname >> rpair []) -- Parse.opt_attribs >> (fn ((c, xs), atts) =>
        Toplevel.proof (Proof.invoke_case_cmd (c, xs, atts))));


(* proof structure *)

val _ =
  Outer_Syntax.command @{command_keyword "{"} "begin explicit proof block"
    (Scan.succeed (Toplevel.proof Proof.begin_block));

val _ =
  Outer_Syntax.command @{command_keyword "}"} "end explicit proof block"
    (Scan.succeed (Toplevel.proof Proof.end_block));

val _ =
  Outer_Syntax.command @{command_keyword next} "enter next proof block"
    (Scan.succeed (Toplevel.proof Proof.next_block));


(* end proof *)

val _ =
  Outer_Syntax.command @{command_keyword qed} "conclude proof"
    (Scan.option Method.parse >> (fn m =>
     (Option.map Method.report m;
      Isar_Cmd.qed m)));

val _ =
  Outer_Syntax.command @{command_keyword by} "terminal backward proof"
    (Method.parse -- Scan.option Method.parse >> (fn (m1, m2) =>
     (Method.report m1;
      Option.map Method.report m2;
      Isar_Cmd.terminal_proof (m1, m2))));

val _ =
  Outer_Syntax.command @{command_keyword ".."} "default proof"
    (Scan.succeed Isar_Cmd.default_proof);

val _ =
  Outer_Syntax.command @{command_keyword "."} "immediate proof"
    (Scan.succeed Isar_Cmd.immediate_proof);

val _ =
  Outer_Syntax.command @{command_keyword done} "done proof"
    (Scan.succeed Isar_Cmd.done_proof);

val _ =
  Outer_Syntax.command @{command_keyword sorry} "skip proof (quick-and-dirty mode only!)"
    (Scan.succeed Isar_Cmd.skip_proof);

val _ =
  Outer_Syntax.command @{command_keyword oops} "forget proof"
    (Scan.succeed (Toplevel.forget_proof true));


(* proof steps *)

val _ =
  Outer_Syntax.command @{command_keyword defer} "shuffle internal proof state"
    (Scan.optional Parse.nat 1 >> (Toplevel.proof o Proof.defer));

val _ =
  Outer_Syntax.command @{command_keyword prefer} "shuffle internal proof state"
    (Parse.nat >> (Toplevel.proof o Proof.prefer));

val _ =
  Outer_Syntax.command @{command_keyword apply} "initial goal refinement step (unstructured)"
    (Method.parse >> (fn m => (Method.report m; Toplevel.proofs (Proof.apply_results m))));

val _ =
  Outer_Syntax.command @{command_keyword apply_end} "terminal goal refinement step (unstructured)"
    (Method.parse >> (fn m => (Method.report m; Toplevel.proofs (Proof.apply_end_results m))));

val _ =
  Outer_Syntax.command @{command_keyword proof} "backward proof step"
    (Scan.option Method.parse >> (fn m =>
      (Option.map Method.report m;
        Toplevel.actual_proof (Proof_Node.applys (Proof.proof_results m)) o
        Toplevel.skip_proof (fn i => i + 1))));


(* proof navigation *)

fun report_back () =
  Output.report [Markup.markup Markup.bad "Explicit backtracking"];

val _ =
  Outer_Syntax.command @{command_keyword back} "explicit backtracking of proof command"
    (Scan.succeed
     (Toplevel.actual_proof (fn prf => (report_back (); Proof_Node.back prf)) o
      Toplevel.skip_proof (fn h => (report_back (); h))));



(** diagnostic commands (for interactive mode only) **)

val opt_modes =
  Scan.optional (@{keyword "("} |-- Parse.!!! (Scan.repeat1 Parse.xname --| @{keyword ")"})) [];

val _ =
  Outer_Syntax.command @{command_keyword help}
    "retrieve outer syntax commands according to name patterns"
    (Scan.repeat Parse.name >>
      (fn pats => Toplevel.keep (fn st => Outer_Syntax.help (Toplevel.theory_of st) pats)));

val _ =
  Outer_Syntax.command @{command_keyword print_commands} "print outer syntax commands"
    (Scan.succeed (Toplevel.keep (Outer_Syntax.print_commands o Toplevel.theory_of)));

val _ =
  Outer_Syntax.command @{command_keyword print_options} "print configuration options"
    (Parse.opt_bang >> (fn b => Toplevel.keep (Attrib.print_options b o Toplevel.context_of)));

val _ =
  Outer_Syntax.command @{command_keyword print_context}
    "print context of local theory target"
    (Scan.succeed (Toplevel.keep (Pretty.writeln_chunks o Toplevel.pretty_context)));

val _ =
  Outer_Syntax.command @{command_keyword print_theory}
    "print logical theory contents"
    (Parse.opt_bang >> (fn b =>
      Toplevel.keep (Pretty.writeln o Proof_Display.pretty_full_theory b o Toplevel.theory_of)));

val _ =
  Outer_Syntax.command @{command_keyword print_syntax}
    "print inner syntax of context"
    (Scan.succeed (Toplevel.keep (Proof_Context.print_syntax o Toplevel.context_of)));

val _ =
  Outer_Syntax.command @{command_keyword print_defn_rules}
    "print definitional rewrite rules of context"
    (Scan.succeed (Toplevel.keep (Local_Defs.print_rules o Toplevel.context_of)));

val _ =
  Outer_Syntax.command @{command_keyword print_abbrevs}
    "print constant abbreviations of context"
    (Parse.opt_bang >> (fn b =>
      Toplevel.keep (Proof_Context.print_abbrevs b o Toplevel.context_of)));

val _ =
  Outer_Syntax.command @{command_keyword print_theorems}
    "print theorems of local theory or proof context"
    (Parse.opt_bang >> (fn b =>
      Toplevel.keep (Pretty.writeln o Pretty.chunks o Isar_Cmd.pretty_theorems b)));

val _ =
  Outer_Syntax.command @{command_keyword print_locales}
    "print locales of this theory"
    (Parse.opt_bang >> (fn b =>
      Toplevel.keep (Locale.print_locales b o Toplevel.theory_of)));

val _ =
  Outer_Syntax.command @{command_keyword print_classes}
    "print classes of this theory"
    (Scan.succeed (Toplevel.keep (Class.print_classes o Toplevel.context_of)));

val _ =
  Outer_Syntax.command @{command_keyword print_locale}
    "print locale of this theory"
    (Parse.opt_bang -- Parse.position Parse.xname >> (fn (b, name) =>
      Toplevel.keep (fn state => Locale.print_locale (Toplevel.theory_of state) b name)));

val _ =
  Outer_Syntax.command @{command_keyword print_interps}
    "print interpretations of locale for this theory or proof context"
    (Parse.position Parse.xname >> (fn name =>
      Toplevel.keep (fn state => Locale.print_registrations (Toplevel.context_of state) name)));

val _ =
  Outer_Syntax.command @{command_keyword print_dependencies}
    "print dependencies of locale expression"
    (Parse.opt_bang -- Parse_Spec.locale_expression true >> (fn (b, expr) =>
      Toplevel.keep (fn state => Expression.print_dependencies (Toplevel.context_of state) b expr)));

val _ =
  Outer_Syntax.command @{command_keyword print_attributes}
    "print attributes of this theory"
    (Parse.opt_bang >> (fn b => Toplevel.keep (Attrib.print_attributes b o Toplevel.context_of)));

val _ =
  Outer_Syntax.command @{command_keyword print_simpset}
    "print context of Simplifier"
    (Parse.opt_bang >> (fn b =>
      Toplevel.keep (Pretty.writeln o Simplifier.pretty_simpset b o Toplevel.context_of)));

val _ =
  Outer_Syntax.command @{command_keyword print_rules} "print intro/elim rules"
    (Scan.succeed (Toplevel.keep (Context_Rules.print_rules o Toplevel.context_of)));

val _ =
  Outer_Syntax.command @{command_keyword print_methods} "print methods of this theory"
    (Parse.opt_bang >> (fn b => Toplevel.keep (Method.print_methods b o Toplevel.context_of)));

val _ =
  Outer_Syntax.command @{command_keyword print_antiquotations}
    "print document antiquotations"
    (Parse.opt_bang >> (fn b =>
      Toplevel.keep (Thy_Output.print_antiquotations b o Toplevel.context_of)));

val _ =
  Outer_Syntax.command @{command_keyword print_ML_antiquotations}
    "print ML antiquotations"
    (Parse.opt_bang >> (fn b =>
      Toplevel.keep (ML_Context.print_antiquotations b o Toplevel.context_of)));

val _ =
  Outer_Syntax.command @{command_keyword locale_deps} "visualize locale dependencies"
    (Scan.succeed
      (Toplevel.keep (Toplevel.theory_of #> (fn thy =>
        Locale.pretty_locale_deps thy
        |> map (fn {name, parents, body} =>
          ((name, Graph_Display.content_node (Locale.extern thy name) [body]), parents))
        |> Graph_Display.display_graph_old))));

val _ =
  Outer_Syntax.command @{command_keyword print_term_bindings}
    "print term bindings of proof context"
    (Scan.succeed
      (Toplevel.keep
        (Pretty.writeln_chunks o Proof_Context.pretty_term_bindings o Toplevel.context_of)));

val _ =
  Outer_Syntax.command @{command_keyword print_facts} "print facts of proof context"
    (Parse.opt_bang >> (fn b =>
      Toplevel.keep (Proof_Context.print_local_facts b o Toplevel.context_of)));

val _ =
  Outer_Syntax.command @{command_keyword print_cases} "print cases of proof context"
    (Scan.succeed
      (Toplevel.keep (Pretty.writeln_chunks o Proof_Context.pretty_cases o Toplevel.context_of)));

val _ =
  Outer_Syntax.command @{command_keyword print_statement}
    "print theorems as long statements"
    (opt_modes -- Parse.xthms1 >> Isar_Cmd.print_stmts);

val _ =
  Outer_Syntax.command @{command_keyword thm} "print theorems"
    (opt_modes -- Parse.xthms1 >> Isar_Cmd.print_thms);

val _ =
  Outer_Syntax.command @{command_keyword prf} "print proof terms of theorems"
    (opt_modes -- Scan.option Parse.xthms1 >> Isar_Cmd.print_prfs false);

val _ =
  Outer_Syntax.command @{command_keyword full_prf} "print full proof terms of theorems"
    (opt_modes -- Scan.option Parse.xthms1 >> Isar_Cmd.print_prfs true);

val _ =
  Outer_Syntax.command @{command_keyword prop} "read and print proposition"
    (opt_modes -- Parse.term >> Isar_Cmd.print_prop);

val _ =
  Outer_Syntax.command @{command_keyword term} "read and print term"
    (opt_modes -- Parse.term >> Isar_Cmd.print_term);

val _ =
  Outer_Syntax.command @{command_keyword typ} "read and print type"
    (opt_modes -- (Parse.typ -- Scan.option (@{keyword "::"} |-- Parse.!!! Parse.sort))
      >> Isar_Cmd.print_type);

val _ =
  Outer_Syntax.command @{command_keyword print_codesetup} "print code generator setup"
    (Scan.succeed (Toplevel.keep (Code.print_codesetup o Toplevel.theory_of)));

val _ =
  Outer_Syntax.command @{command_keyword print_state}
    "print current proof state (if present)"
    (opt_modes >> (fn modes => Toplevel.keep (Print_Mode.with_modes modes Toplevel.print_state)));

val _ =
  Outer_Syntax.command @{command_keyword welcome} "print welcome message"
    (Scan.succeed (Toplevel.keep (fn _ => writeln (Session.welcome ()))));

val _ =
  Outer_Syntax.command @{command_keyword display_drafts}
    "display raw source files with symbols"
    (Scan.repeat1 Parse.path >> (fn names =>
      Toplevel.keep (fn _ => ignore (Present.display_drafts (map Path.explode names)))));



(** extraction of programs from proofs **)

val parse_vars = Scan.optional (Parse.$$$ "(" |-- Parse.list1 Parse.name --| Parse.$$$ ")") [];

val _ =
  Outer_Syntax.command @{command_keyword realizers}
    "specify realizers for primitive axioms / theorems, together with correctness proof"
    (Scan.repeat1 (Parse.xname -- parse_vars --| Parse.$$$ ":" -- Parse.string -- Parse.string) >>
     (fn xs => Toplevel.theory (fn thy => Extraction.add_realizers
       (map (fn (((a, vs), s1), s2) => (Global_Theory.get_thm thy a, (vs, s1, s2))) xs) thy)));

val _ =
  Outer_Syntax.command @{command_keyword realizability}
    "add equations characterizing realizability"
    (Scan.repeat1 Parse.string >> (Toplevel.theory o Extraction.add_realizes_eqns));

val _ =
  Outer_Syntax.command @{command_keyword extract_type}
    "add equations characterizing type of extracted program"
    (Scan.repeat1 Parse.string >> (Toplevel.theory o Extraction.add_typeof_eqns));

val _ =
  Outer_Syntax.command @{command_keyword extract} "extract terms from proofs"
    (Scan.repeat1 (Parse.xname -- parse_vars) >> (fn xs => Toplevel.theory (fn thy =>
      Extraction.extract (map (apfst (Global_Theory.get_thm thy)) xs) thy)));



(** end **)

val _ =
  Outer_Syntax.command @{command_keyword end} "end context"
    (Scan.succeed
      (Toplevel.exit o Toplevel.end_local_theory o Toplevel.close_target o
        Toplevel.end_proof (K Proof.end_notepad)));

end;