author | wenzelm |
Thu, 07 May 1998 18:05:46 +0200 | |
changeset 4902 | 8fbccead3695 |
parent 4703 | a50ab39756db |
child 4921 | 74bc10921f7d |
permissions | -rw-r--r-- |
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(* Title: Pure/Syntax/lexicon.ML |
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ID: $Id$ |
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Author: Tobias Nipkow and Markus Wenzel, TU Muenchen |
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|
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Lexer for the inner Isabelle syntax (terms and types). |
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*) |
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|
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signature LEXICON0 = |
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sig |
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val is_identifier: string -> bool |
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val implode_xstr: string list -> string |
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val explode_xstr: string -> string list |
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val scan_id: string list -> string * string list |
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val scan_longid: string list -> string * string list |
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val scan_var: string list -> string * string list |
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val scan_tid: string list -> string * string list |
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val scan_tvar: string list -> string * string list |
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val scan_nat: string list -> string * string list |
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val scan_int: string list -> string * string list |
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val string_of_vname: indexname -> string |
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val string_of_vname': indexname -> string |
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val indexname: string list -> indexname |
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val read_var: string -> term |
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val const: string -> term |
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val free: string -> term |
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val var: indexname -> term |
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end; |
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signature LEXICON = |
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sig |
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include LEXICON0 |
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val is_xid: string -> bool |
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val is_tid: string -> bool |
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datatype token = |
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Token of string | |
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IdentSy of string | |
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LongIdentSy of string | |
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VarSy of string | |
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TFreeSy of string | |
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TVarSy of string | |
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NumSy of string | |
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StrSy of string | |
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EndToken |
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val idT: typ |
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val longidT: typ |
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val varT: typ |
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val tidT: typ |
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val tvarT: typ |
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val terminals: string list |
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val is_terminal: string -> bool |
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val str_of_token: token -> string |
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val display_token: token -> string |
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val matching_tokens: token * token -> bool |
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val token_assoc: (token option * 'a list) list * token -> 'a list |
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val valued_token: token -> bool |
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val predef_term: string -> token option |
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val tokenize: Scan.lexicon -> bool -> string list -> token list |
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end; |
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structure Lexicon : LEXICON = |
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struct |
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||
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(** is_identifier etc. **) |
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||
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fun is_ident [] = false |
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| is_ident (c :: cs) = Symbol.is_letter c andalso forall Symbol.is_letdig cs; |
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val is_identifier = is_ident o Symbol.explode; |
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fun is_xid s = |
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(case Symbol.explode s of |
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"_" :: cs => is_ident cs |
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| cs => is_ident cs); |
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||
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fun is_tid s = |
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(case Symbol.explode s of |
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"'" :: cs => is_ident cs |
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| _ => false); |
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||
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(** basic scanners **) |
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val scan_letter_letdigs = Scan.one Symbol.is_letter -- Scan.any Symbol.is_letdig >> op ::; |
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val scan_digits1 = Scan.any1 Symbol.is_digit; |
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val scan_id = scan_letter_letdigs >> implode; |
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val scan_longid = scan_id ^^ (Scan.repeat1 ($$ "." ^^ scan_id) >> implode); |
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val scan_tid = $$ "'" ^^ scan_id; |
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||
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val scan_nat = scan_digits1 >> implode; |
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val scan_int = $$ "~" ^^ scan_nat || scan_nat; |
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val scan_id_nat = scan_id ^^ Scan.optional ($$ "." ^^ scan_nat) ""; |
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val scan_var = $$ "?" ^^ scan_id_nat; |
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val scan_tvar = $$ "?" ^^ $$ "'" ^^ scan_id_nat; |
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(** string_of_vname **) |
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fun string_of_vname (x, i) = |
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let |
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val si = string_of_int i; |
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val dot = Symbol.is_digit (last_elem (Symbol.explode x)) handle _ => true; |
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in |
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if dot then "?" ^ x ^ "." ^ si |
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else if i = 0 then "?" ^ x |
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else "?" ^ x ^ si |
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end; |
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fun string_of_vname' (x, ~1) = x |
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| string_of_vname' xi = string_of_vname xi; |
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(** datatype token **) |
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datatype token = |
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Token of string | |
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IdentSy of string | |
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LongIdentSy of string | |
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VarSy of string | |
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TFreeSy of string | |
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TVarSy of string | |
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NumSy of string | |
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StrSy of string | |
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EndToken; |
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(* terminal arguments *) |
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val idT = Type ("id", []); |
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val longidT = Type ("longid", []); |
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val varT = Type ("var", []); |
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val tidT = Type ("tid", []); |
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val tvarT = Type ("tvar", []); |
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val terminals = ["id", "longid", "var", "tid", "tvar", "xnum", "xstr"]; |
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fun is_terminal s = s mem terminals; |
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(* str_of_token *) |
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fun str_of_token (Token s) = s |
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| str_of_token (IdentSy s) = s |
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| str_of_token (LongIdentSy s) = s |
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| str_of_token (VarSy s) = s |
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| str_of_token (TFreeSy s) = s |
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| str_of_token (TVarSy s) = s |
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| str_of_token (NumSy s) = s |
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| str_of_token (StrSy s) = s |
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| str_of_token EndToken = "EOF"; |
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(* display_token *) |
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fun display_token (Token s) = quote s |
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| display_token (IdentSy s) = "id(" ^ s ^ ")" |
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| display_token (LongIdentSy s) = "longid(" ^ s ^ ")" |
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| display_token (VarSy s) = "var(" ^ s ^ ")" |
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| display_token (TFreeSy s) = "tid(" ^ s ^ ")" |
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| display_token (TVarSy s) = "tvar(" ^ s ^ ")" |
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| display_token (NumSy s) = "xnum(" ^ s ^ ")" |
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| display_token (StrSy s) = "xstr(" ^ s ^ ")" |
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| display_token EndToken = ""; |
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(* matching_tokens *) |
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fun matching_tokens (Token x, Token y) = (x = y) |
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| matching_tokens (IdentSy _, IdentSy _) = true |
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| matching_tokens (LongIdentSy _, LongIdentSy _) = true |
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| matching_tokens (VarSy _, VarSy _) = true |
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| matching_tokens (TFreeSy _, TFreeSy _) = true |
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| matching_tokens (TVarSy _, TVarSy _) = true |
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| matching_tokens (NumSy _, NumSy _) = true |
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| matching_tokens (StrSy _, StrSy _) = true |
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| matching_tokens (EndToken, EndToken) = true |
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| matching_tokens _ = false; |
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(* token_assoc *) |
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fun token_assoc (list, key) = |
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let |
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fun assoc [] = [] |
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| assoc ((keyi, xi) :: pairs) = |
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if is_none keyi orelse matching_tokens (the keyi, key) then |
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assoc pairs @ xi |
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else assoc pairs; |
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in assoc list end; |
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|
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(* valued_token *) |
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fun valued_token (Token _) = false |
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| valued_token (IdentSy _) = true |
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| valued_token (LongIdentSy _) = true |
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| valued_token (VarSy _) = true |
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| valued_token (TFreeSy _) = true |
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| valued_token (TVarSy _) = true |
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| valued_token (NumSy _) = true |
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| valued_token (StrSy _) = true |
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| valued_token EndToken = false; |
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||
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(* predef_term *) |
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fun predef_term "id" = Some (IdentSy "id") |
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| predef_term "longid" = Some (LongIdentSy "longid") |
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| predef_term "var" = Some (VarSy "var") |
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| predef_term "tid" = Some (TFreeSy "tid") |
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| predef_term "tvar" = Some (TVarSy "tvar") |
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| predef_term "xnum" = Some (NumSy "xnum") |
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| predef_term "xstr" = Some (StrSy "xstr") |
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| predef_term _ = None; |
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|
221 |
||
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(* xstr tokens *) |
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|
4703 | 224 |
val scan_chr = |
225 |
$$ "\\" |-- Scan.one Symbol.not_eof || |
|
226 |
Scan.one (not_equal "'" andf Symbol.not_eof) || |
|
227 |
$$ "'" --| Scan.ahead (Scan.one (not_equal "'")); |
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|
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val scan_str = |
230 |
$$ "'" |-- $$ "'" |-- |
|
231 |
!! (fn cs => "Inner lexical error: malformed literal string at " ^ quote ("''" ^ beginning cs)) |
|
232 |
(Scan.repeat scan_chr --| $$ "'" --| $$ "'"); |
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fun implode_xstr cs = enclose "''" "''" (implode (map (fn "'" => "\\'" | c => c) cs)); |
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|
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fun explode_xstr str = |
238 |
#1 (Scan.error (Scan.finite Symbol.eof scan_str) (Symbol.explode str)); |
|
18 | 239 |
|
240 |
||
241 |
||
242 |
(** tokenize **) |
|
243 |
||
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fun tokenize lex xids chs = |
18 | 245 |
let |
246 |
val scan_xid = |
|
247 |
if xids then $$ "_" ^^ scan_id || scan_id |
|
248 |
else scan_id; |
|
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||
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250 |
val scan_val = |
4902 | 251 |
scan_tvar >> pair TVarSy || |
4703 | 252 |
scan_var >> pair VarSy || |
253 |
scan_tid >> pair TFreeSy || |
|
254 |
$$ "#" ^^ scan_int >> pair NumSy || (* FIXME remove "#" *) |
|
3828 | 255 |
scan_longid >> pair LongIdentSy || |
18 | 256 |
scan_xid >> pair IdentSy; |
257 |
||
4703 | 258 |
val scan_lit = Scan.literal lex >> (pair Token o implode); |
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259 |
|
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val scan_token = |
261 |
Scan.max (op <= o pairself snd) scan_lit scan_val >> (fn (tk, s) => Some (tk s)) || |
|
262 |
scan_str >> (Some o StrSy o implode_xstr) || |
|
263 |
Scan.one Symbol.is_blank >> K None; |
|
18 | 264 |
in |
4703 | 265 |
(case Scan.error (Scan.finite Symbol.eof (Scan.repeat scan_token)) chs of |
266 |
(toks, []) => mapfilter I toks @ [EndToken] |
|
267 |
| (_, cs) => error ("Inner lexical error at: " ^ quote (implode cs))) |
|
18 | 268 |
end; |
269 |
||
270 |
||
271 |
||
272 |
(** scan variables **) |
|
273 |
||
274 |
(* scan_vname *) |
|
275 |
||
276 |
fun scan_vname chrs = |
|
277 |
let |
|
278 |
fun nat_of_chs n [] = n |
|
279 |
| nat_of_chs n (c :: cs) = nat_of_chs (n * 10 + (ord c - ord "0")) cs; |
|
280 |
||
4703 | 281 |
val nat = nat_of_chs 0; |
18 | 282 |
|
283 |
fun split_vname chs = |
|
4703 | 284 |
let val (cs, ds) = take_suffix Symbol.is_digit chs |
285 |
in (implode cs, nat ds) end |
|
18 | 286 |
|
287 |
val scan = |
|
4703 | 288 |
scan_letter_letdigs -- Scan.optional ($$ "." |-- scan_digits1 >> nat) ~1; |
18 | 289 |
in |
290 |
(case scan chrs of |
|
291 |
((cs, ~1), cs') => (split_vname cs, cs') |
|
292 |
| ((cs, i), cs') => ((implode cs, i), cs')) |
|
293 |
end; |
|
294 |
||
295 |
||
4703 | 296 |
(* indexname *) |
18 | 297 |
|
4703 | 298 |
fun indexname cs = |
299 |
(case Scan.error (Scan.finite Symbol.eof (Scan.option scan_vname)) cs of |
|
300 |
(Some xi, []) => xi |
|
301 |
| _ => error ("Lexical error in variable name: " ^ quote (implode cs))); |
|
18 | 302 |
|
303 |
||
4703 | 304 |
(* read_var *) |
18 | 305 |
|
550
353eea6ec232
replaced id, var, tid, tvar by idT, varT, tidT, tvarT;
wenzelm
parents:
376
diff
changeset
|
306 |
fun const c = Const (c, dummyT); |
353eea6ec232
replaced id, var, tid, tvar by idT, varT, tidT, tvarT;
wenzelm
parents:
376
diff
changeset
|
307 |
fun free x = Free (x, dummyT); |
353eea6ec232
replaced id, var, tid, tvar by idT, varT, tidT, tvarT;
wenzelm
parents:
376
diff
changeset
|
308 |
fun var xi = Var (xi, dummyT); |
353eea6ec232
replaced id, var, tid, tvar by idT, varT, tidT, tvarT;
wenzelm
parents:
376
diff
changeset
|
309 |
|
4703 | 310 |
fun read_var str = |
18 | 311 |
let |
550
353eea6ec232
replaced id, var, tid, tvar by idT, varT, tidT, tvarT;
wenzelm
parents:
376
diff
changeset
|
312 |
fun tvar (x, i) = var ("'" ^ x, i); |
18 | 313 |
|
314 |
val scan = |
|
4703 | 315 |
$$ "?" |-- $$ "'" |-- scan_vname >> tvar || |
316 |
$$ "?" |-- scan_vname >> var || |
|
317 |
Scan.any Symbol.not_eof >> (free o implode); |
|
18 | 318 |
in |
4703 | 319 |
#1 (Scan.error (Scan.finite Symbol.eof scan) (Symbol.explode str)) |
4587 | 320 |
end; |
321 |
||
322 |
||
0 | 323 |
end; |