author | wenzelm |
Tue, 17 Nov 1998 14:10:40 +0100 | |
changeset 5911 | 7da8033264fa |
parent 5878 | 769abc29bb8e |
child 5934 | ecc224b81f7f |
permissions | -rw-r--r-- |
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Concrete argument syntax (for attributes, methods etc.).
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(* Title: Pure/Isar/args.ML |
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Concrete argument syntax (for attributes, methods etc.).
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ID: $Id$ |
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Concrete argument syntax (for attributes, methods etc.).
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Author: Markus Wenzel, TU Muenchen |
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5878 | 5 |
Concrete argument syntax (of attributes and methods). |
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*) |
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signature ARGS = |
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sig |
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type T |
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val val_of: T -> string |
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val pos_of: T -> Position.T |
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val str_of: T -> string |
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val ident: string * Position.T -> T |
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val string: string * Position.T -> T |
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val keyword: string * Position.T -> T |
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val stopper: T * (T -> bool) |
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val not_eof: T -> bool |
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val position: (T list -> 'a * 'b) -> T list -> ('a * Position.T) * 'b |
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val !!! : (T list -> 'a) -> T list -> 'a |
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val $$$ : string -> T list -> string * T list |
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val name: T list -> string * T list |
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val nat: T list -> int * T list |
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val var: T list -> indexname * T list |
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val enum1: string -> (T list -> 'a * T list) -> T list -> 'a list * T list |
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val enum: string -> (T list -> 'a * T list) -> T list -> 'a list * T list |
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val list1: (T list -> 'a * T list) -> T list -> 'a list * T list |
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val list: (T list -> 'a * T list) -> T list -> 'a list * T list |
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val global_typ: theory * T list -> typ * (theory * T list) |
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val global_term: theory * T list -> term * (theory * T list) |
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val global_prop: theory * T list -> term * (theory * T list) |
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val global_pat: theory * T list -> term * (theory * T list) |
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val local_typ: Proof.context * T list -> typ * (Proof.context * T list) |
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val local_term: Proof.context * T list -> term * (Proof.context * T list) |
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val local_prop: Proof.context * T list -> term * (Proof.context * T list) |
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val local_pat: Proof.context * T list -> term * (Proof.context * T list) |
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type src |
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val src: (string * T list) * Position.T -> src |
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val dest_src: src -> (string * T list) * Position.T |
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val attribs: T list -> src list * T list |
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val opt_attribs: T list -> src list * T list |
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val syntax: string -> ('a * T list -> 'b * ('a * T list)) -> 'a -> src -> 'a * 'b |
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end; |
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structure Args: ARGS = |
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struct |
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(** datatype T **) |
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datatype kind = Ident | String | Keyword | EOF; |
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datatype T = Arg of kind * (string * Position.T); |
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fun val_of (Arg (_, (x, _))) = x; |
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fun pos_of (Arg (_, (_, pos))) = pos; |
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fun str_of (Arg (Ident, (x, _))) = enclose "'" "'" x |
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| str_of (Arg (String, (x, _))) = quote x |
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| str_of (Arg (Keyword, (x, _))) = x |
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| str_of (Arg (EOF, _)) = "end-of-text"; |
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fun arg kind x_pos = Arg (kind, x_pos); |
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val ident = arg Ident; |
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val string = arg String; |
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val keyword = arg Keyword; |
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(* eof *) |
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val eof = arg EOF ("", Position.none); |
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fun is_eof (Arg (EOF, _)) = true |
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| is_eof _ = false; |
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val stopper = (eof, is_eof); |
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val not_eof = not o is_eof; |
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(** scanners **) |
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(* position *) |
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fun position scan = (Scan.ahead (Scan.one not_eof) >> pos_of) -- scan >> Library.swap; |
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(* cut *) |
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fun !!! scan = |
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let |
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fun get_pos [] = " (past end-of-text!)" |
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| get_pos (Arg (_, (_, pos)) :: _) = Position.str_of pos; |
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fun err (args, None) = "Argument syntax error" ^ get_pos args |
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| err (args, Some msg) = "Argument syntax error" ^ get_pos args ^ ": " ^ msg; |
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in Scan.!! err scan end; |
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(* basic *) |
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fun $$$$ x = Scan.one (fn Arg (k, (y, _)) => (k = Ident orelse k = Keyword) andalso x = y); |
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fun $$$ x = $$$$ x >> val_of; |
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val name = Scan.one (fn Arg (k, (x, _)) => k = Ident orelse k = String) >> val_of; |
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fun kind f = Scan.one (K true) :-- |
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(fn Arg (Ident, (x, _)) => |
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(case f x of Some y => Scan.succeed y | _ => Scan.fail) |
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| _ => Scan.fail) >> #2; |
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val nat = kind Syntax.read_nat; |
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val var = kind (apsome #1 o try Term.dest_Var o Syntax.read_var); |
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(* enumerations *) |
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fun enum1 sep scan = scan -- Scan.repeat ($$$ sep |-- scan) >> op ::; |
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fun enum sep scan = enum1 sep scan || Scan.succeed []; |
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fun list1 scan = enum1 "," scan; |
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fun list scan = enum "," scan; |
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(* terms and types *) |
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fun gen_item read = Scan.depend (fn st => name >> (pair st o read st)); |
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val global_typ = gen_item (ProofContext.read_typ o ProofContext.init); |
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val global_term = gen_item (ProofContext.read_term o ProofContext.init); |
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val global_prop = gen_item (ProofContext.read_prop o ProofContext.init); |
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val global_pat = gen_item (ProofContext.read_pat o ProofContext.init); |
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val local_typ = gen_item ProofContext.read_typ; |
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val local_term = gen_item ProofContext.read_term; |
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val local_prop = gen_item ProofContext.read_prop; |
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val local_pat = gen_item ProofContext.read_pat; |
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(* args *) |
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val exclude = explode "(){}[],"; |
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fun atom_arg blk = Scan.one (fn Arg (k, (x, _)) => |
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k <> Keyword orelse not (x mem exclude) orelse blk andalso x = ","); |
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fun paren_args l r scan = $$$$ l -- !!! (scan true -- $$$$ r) |
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>> (fn (x, (ys, z)) => x :: ys @ [z]); |
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fun args blk x = Scan.optional (args1 blk) [] x |
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and args1 blk x = |
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((Scan.repeat1 |
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(Scan.repeat1 (atom_arg blk) || |
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paren_args "(" ")" args || |
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paren_args "{" "}" args || |
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paren_args "[" "]" args)) >> flat) x; |
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(** type src **) |
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datatype src = Src of (string * T list) * Position.T; |
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val src = Src; |
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fun dest_src (Src src) = src; |
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fun err_in_src kind msg (Src ((s, args), pos)) = |
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error (kind ^ " " ^ s ^ Position.str_of pos ^ ": " ^ msg ^ "\n " ^ |
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space_implode " " (map str_of args)); |
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(* argument syntax *) |
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fun syntax kind scan st (src as Src ((s, args), pos)) = |
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(case handle_error (Scan.error (Scan.finite' stopper (Scan.option scan))) (st, args) of |
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OK (Some x, (st', [])) => (st', x) |
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| OK (_, (_, args')) => err_in_src kind "bad arguments" (Src ((s, args'), pos)) |
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| Error msg => err_in_src kind ("\n" ^ msg) src); |
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(* attribs *) |
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val attrib = position (name -- !!! (args false)) >> src; |
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val attribs = $$$ "[" |-- !!! (list attrib --| $$$ "]"); |
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val opt_attribs = Scan.optional attribs []; |
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end; |