author | wenzelm |
Sat, 13 Nov 2010 19:47:23 +0100 | |
changeset 40525 | 14a2e686bdac |
parent 40523 | 1050315f6ee2 |
child 40531 | 8ede48c93c72 |
permissions | -rw-r--r-- |
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1 |
(* Title: Pure/Isar/token.ML |
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Author: Markus Wenzel, TU Muenchen |
3 |
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4 |
Outer token syntax for Isabelle/Isar. |
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*) |
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7 |
signature TOKEN = |
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sig |
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datatype kind = |
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Command | Keyword | Ident | LongIdent | SymIdent | Var | TypeIdent | TypeVar | |
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Nat | Float | String | AltString | Verbatim | Space | Comment | InternalValue | |
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Malformed | Error of string | Sync | EOF |
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datatype value = |
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14 |
Text of string | Typ of typ | Term of term | Fact of thm list | |
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Attribute of morphism -> attribute |
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type T |
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val str_of_kind: kind -> string |
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val position_of: T -> Position.T |
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val end_position_of: T -> Position.T |
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val pos_of: T -> string |
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val eof: T |
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val is_eof: T -> bool |
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val not_eof: T -> bool |
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val not_sync: T -> bool |
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val stopper: T Scan.stopper |
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val kind_of: T -> kind |
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val is_kind: kind -> T -> bool |
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val keyword_with: (string -> bool) -> T -> bool |
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val ident_with: (string -> bool) -> T -> bool |
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val is_proper: T -> bool |
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val is_semicolon: T -> bool |
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val is_comment: T -> bool |
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val is_begin_ignore: T -> bool |
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val is_end_ignore: T -> bool |
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val is_blank: T -> bool |
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val is_newline: T -> bool |
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val source_of: T -> string |
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val source_position_of: T -> Symbol_Pos.text * Position.T |
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val content_of: T -> string |
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val unparse: T -> string |
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val text_of: T -> string * string |
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val get_value: T -> value option |
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val map_value: (value -> value) -> T -> T |
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val mk_text: string -> T |
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val mk_typ: typ -> T |
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val mk_term: term -> T |
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val mk_fact: thm list -> T |
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val mk_attribute: (morphism -> attribute) -> T |
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val assignable: T -> T |
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val assign: value option -> T -> unit |
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val closure: T -> T |
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val ident_or_symbolic: string -> bool |
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val !!! : string -> (Symbol_Pos.T list -> 'a) -> Symbol_Pos.T list -> 'a |
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val source_proper: (T, 'a) Source.source -> (T, (T, 'a) Source.source) Source.source |
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val source': {do_recover: bool Option.option} -> (unit -> Scan.lexicon * Scan.lexicon) -> |
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(Symbol_Pos.T, 'a) Source.source -> (T, (Symbol_Pos.T, 'a) Source.source) Source.source |
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val source: {do_recover: bool Option.option} -> (unit -> Scan.lexicon * Scan.lexicon) -> |
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Position.T -> (Symbol.symbol, 'a) Source.source -> (T, |
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(Symbol_Pos.T, Position.T * (Symbol.symbol, 'a) Source.source) Source.source) Source.source |
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val read_antiq: Scan.lexicon -> (T list -> 'a * T list) -> Symbol_Pos.T list * Position.T -> 'a |
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end; |
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structure Token: TOKEN = |
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struct |
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(** tokens **) |
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(* token values *) |
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(*The value slot assigns an (optional) internal value to a token, |
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usually as a side-effect of special scanner setup (see also |
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args.ML). Note that an assignable ref designates an intermediate |
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state of internalization -- it is NOT meant to persist.*) |
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datatype value = |
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Text of string | |
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Typ of typ | |
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Term of term | |
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Fact of thm list | |
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Attribute of morphism -> attribute; |
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datatype slot = |
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Slot | |
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Value of value option | |
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Assignable of value option Unsynchronized.ref; |
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(* datatype token *) |
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datatype kind = |
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Command | Keyword | Ident | LongIdent | SymIdent | Var | TypeIdent | TypeVar | |
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Nat | Float | String | AltString | Verbatim | Space | Comment | InternalValue | |
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Malformed | Error of string | Sync | EOF; |
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datatype T = Token of (Symbol_Pos.text * Position.range) * (kind * string) * slot; |
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val str_of_kind = |
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fn Command => "command" |
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| Keyword => "keyword" |
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| Ident => "identifier" |
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| LongIdent => "long identifier" |
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| SymIdent => "symbolic identifier" |
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| Var => "schematic variable" |
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| TypeIdent => "type variable" |
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| TypeVar => "schematic type variable" |
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| Nat => "natural number" |
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| Float => "floating-point number" |
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| String => "string" |
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| AltString => "back-quoted string" |
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| Verbatim => "verbatim text" |
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| Space => "white space" |
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| Comment => "comment text" |
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| InternalValue => "internal value" |
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| Malformed => "malformed symbolic character" |
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| Error _ => "bad input" |
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| Sync => "sync marker" |
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| EOF => "end-of-file"; |
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(* position *) |
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fun position_of (Token ((_, (pos, _)), _, _)) = pos; |
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fun end_position_of (Token ((_, (_, pos)), _, _)) = pos; |
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val pos_of = Position.str_of o position_of; |
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abstract type Scan.stopper, position taken from last input token;
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(* control tokens *) |
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fun mk_eof pos = Token (("", (pos, Position.none)), (EOF, ""), Slot); |
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val eof = mk_eof Position.none; |
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132 |
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fun is_eof (Token (_, (EOF, _), _)) = true |
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| is_eof _ = false; |
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val not_eof = not o is_eof; |
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fun not_sync (Token (_, (Sync, _), _)) = false |
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| not_sync _ = true; |
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val stopper = |
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Scan.stopper (fn [] => eof | toks => mk_eof (end_position_of (List.last toks))) is_eof; |
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|
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144 |
|
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(* kind of token *) |
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fun kind_of (Token (_, (k, _), _)) = k; |
148 |
fun is_kind k (Token (_, (k', _), _)) = k = k'; |
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fun keyword_with pred (Token (_, (Keyword, x), _)) = pred x |
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| keyword_with _ _ = false; |
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|
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fun ident_with pred (Token (_, (Ident, x), _)) = pred x |
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| ident_with _ _ = false; |
155 |
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fun is_proper (Token (_, (Space, _), _)) = false |
157 |
| is_proper (Token (_, (Comment, _), _)) = false |
|
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| is_proper _ = true; |
159 |
||
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fun is_semicolon (Token (_, (Keyword, ";"), _)) = true |
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| is_semicolon _ = false; |
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fun is_comment (Token (_, (Comment, _), _)) = true |
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| is_comment _ = false; |
165 |
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fun is_begin_ignore (Token (_, (Comment, "<"), _)) = true |
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| is_begin_ignore _ = false; |
168 |
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fun is_end_ignore (Token (_, (Comment, ">"), _)) = true |
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| is_end_ignore _ = false; |
171 |
||
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|
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(* blanks and newlines -- space tokens obey lines *) |
8651 | 174 |
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fun is_blank (Token (_, (Space, x), _)) = not (String.isSuffix "\n" x) |
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| is_blank _ = false; |
177 |
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fun is_newline (Token (_, (Space, x), _)) = String.isSuffix "\n" x |
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| is_newline _ = false; |
180 |
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5825 | 181 |
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(* token content *) |
9155 | 183 |
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fun source_of (Token ((source, (pos, _)), _, _)) = |
38229 | 185 |
YXML.string_of (XML.Elem (Markup.token (Position.properties_of pos), [XML.Text source])); |
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text_of: made even more robust against recurrent errors;
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186 |
|
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fun source_position_of (Token ((source, (pos, _)), _, _)) = (source, pos); |
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fun content_of (Token (_, (_, x), _)) = x; |
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token: maintain of source, which retains original position information;
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token: maintain of source, which retains original position information;
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token: maintain of source, which retains original position information;
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192 |
(* unparse *) |
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193 |
|
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fun escape q = |
195 |
implode o map (fn s => if s = q orelse s = "\\" then "\\" ^ s else s) o Symbol.explode; |
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196 |
||
27814 | 197 |
fun unparse (Token (_, (kind, x), _)) = |
14991 | 198 |
(case kind of |
18547 | 199 |
String => x |> quote o escape "\"" |
200 |
| AltString => x |> enclose "`" "`" o escape "`" |
|
14991 | 201 |
| Verbatim => x |> enclose "{*" "*}" |
202 |
| Comment => x |> enclose "(*" "*)" |
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text_of Malformed: explode with spaces -- Output.output/escape ineffective by default;
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203 |
| Malformed => space_implode " " (explode x) |
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separated Malformed (symbolic char) from Error (bad input);
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|
204 |
| Sync => "" |
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changeset
|
205 |
| EOF => "" |
14991 | 206 |
| _ => x); |
207 |
||
23788
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Symbol.not_eof/sync is superceded by Symbol.is_regular (rules out further control symbols);
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|
208 |
fun text_of tok = |
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|
209 |
if is_semicolon tok then ("terminator", "") |
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210 |
else |
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Symbol.not_eof/sync is superceded by Symbol.is_regular (rules out further control symbols);
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|
211 |
let |
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Symbol.not_eof/sync is superceded by Symbol.is_regular (rules out further control symbols);
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changeset
|
212 |
val k = str_of_kind (kind_of tok); |
40523
1050315f6ee2
simplified/robustified treatment of malformed symbols, which are now fully internalized (total Symbol.explode etc.);
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|
213 |
val s = unparse tok; |
23788
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Symbol.not_eof/sync is superceded by Symbol.is_regular (rules out further control symbols);
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|
214 |
in |
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Symbol.not_eof/sync is superceded by Symbol.is_regular (rules out further control symbols);
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|
215 |
if s = "" then (k, "") |
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|
216 |
else if size s < 40 andalso not (exists_string (fn c => c = "\n") s) then (k ^ " " ^ s, "") |
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|
217 |
else (k, s) |
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|
218 |
end; |
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|
219 |
|
5825 | 220 |
|
221 |
||
27814 | 222 |
(** associated values **) |
223 |
||
224 |
(* access values *) |
|
225 |
||
226 |
fun get_value (Token (_, _, Value v)) = v |
|
227 |
| get_value _ = NONE; |
|
228 |
||
229 |
fun map_value f (Token (x, y, Value (SOME v))) = Token (x, y, Value (SOME (f v))) |
|
230 |
| map_value _ tok = tok; |
|
231 |
||
232 |
||
233 |
(* make values *) |
|
234 |
||
235 |
fun mk_value k v = Token ((k, Position.no_range), (InternalValue, k), Value (SOME v)); |
|
236 |
||
237 |
val mk_text = mk_value "<text>" o Text; |
|
238 |
val mk_typ = mk_value "<typ>" o Typ; |
|
239 |
val mk_term = mk_value "<term>" o Term; |
|
240 |
val mk_fact = mk_value "<fact>" o Fact; |
|
241 |
val mk_attribute = mk_value "<attribute>" o Attribute; |
|
242 |
||
243 |
||
244 |
(* static binding *) |
|
245 |
||
246 |
(*1st stage: make empty slots assignable*) |
|
32738 | 247 |
fun assignable (Token (x, y, Slot)) = Token (x, y, Assignable (Unsynchronized.ref NONE)) |
27814 | 248 |
| assignable tok = tok; |
249 |
||
250 |
(*2nd stage: assign values as side-effect of scanning*) |
|
251 |
fun assign v (Token (_, _, Assignable r)) = r := v |
|
252 |
| assign _ _ = (); |
|
253 |
||
254 |
(*3rd stage: static closure of final values*) |
|
32738 | 255 |
fun closure (Token (x, y, Assignable (Unsynchronized.ref v))) = Token (x, y, Value v) |
27814 | 256 |
| closure tok = tok; |
257 |
||
258 |
||
259 |
||
5825 | 260 |
(** scanners **) |
261 |
||
30573 | 262 |
open Basic_Symbol_Pos; |
5825 | 263 |
|
30573 | 264 |
fun !!! msg = Symbol_Pos.!!! ("Outer lexical error: " ^ msg); |
5825 | 265 |
|
266 |
||
267 |
(* scan symbolic idents *) |
|
268 |
||
20664 | 269 |
val is_sym_char = member (op =) (explode "!#$%&*+-/<=>?@^_|~"); |
5825 | 270 |
|
8231 | 271 |
val scan_symid = |
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changeset
|
272 |
Scan.many1 (is_sym_char o Symbol_Pos.symbol) || |
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changeset
|
273 |
Scan.one (Symbol.is_symbolic o Symbol_Pos.symbol) >> single; |
5825 | 274 |
|
8231 | 275 |
fun is_symid str = |
276 |
(case try Symbol.explode str of |
|
15531 | 277 |
SOME [s] => Symbol.is_symbolic s orelse is_sym_char s |
278 |
| SOME ss => forall is_sym_char ss |
|
8231 | 279 |
| _ => false); |
280 |
||
27814 | 281 |
fun ident_or_symbolic "begin" = false |
282 |
| ident_or_symbolic ":" = true |
|
283 |
| ident_or_symbolic "::" = true |
|
284 |
| ident_or_symbolic s = Syntax.is_identifier s orelse is_symid s; |
|
5825 | 285 |
|
286 |
||
287 |
(* scan verbatim text *) |
|
288 |
||
289 |
val scan_verb = |
|
27769 | 290 |
$$$ "*" --| Scan.ahead (~$$$ "}") || |
291 |
Scan.one (fn (s, _) => s <> "*" andalso Symbol.is_regular s) >> single; |
|
5825 | 292 |
|
293 |
val scan_verbatim = |
|
30573 | 294 |
(Symbol_Pos.scan_pos --| $$$ "{" --| $$$ "*") -- !!! "missing end of verbatim text" |
30586
9674f64a0702
moved basic change_prompt, scan_string, scan_alt_string, scan_quoted to symbol_pos.ML;
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parents:
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diff
changeset
|
295 |
(Symbol_Pos.change_prompt |
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diff
changeset
|
296 |
((Scan.repeat scan_verb >> flat) -- ($$$ "*" |-- $$$ "}" |-- Symbol_Pos.scan_pos))); |
5825 | 297 |
|
298 |
||
299 |
(* scan space *) |
|
300 |
||
19305 | 301 |
fun is_space s = Symbol.is_blank s andalso s <> "\n"; |
5825 | 302 |
|
303 |
val scan_space = |
|
40525
14a2e686bdac
eliminated slightly odd pervasive Symbol_Pos.symbol;
wenzelm
parents:
40523
diff
changeset
|
304 |
Scan.many1 (is_space o Symbol_Pos.symbol) @@@ Scan.optional ($$$ "\n") [] || |
14a2e686bdac
eliminated slightly odd pervasive Symbol_Pos.symbol;
wenzelm
parents:
40523
diff
changeset
|
305 |
Scan.many (is_space o Symbol_Pos.symbol) @@@ $$$ "\n"; |
5825 | 306 |
|
307 |
||
27780
7d0910f662f7
more precise positions due to SymbolsPos.implode_delim;
wenzelm
parents:
27769
diff
changeset
|
308 |
(* scan comment *) |
5825 | 309 |
|
310 |
val scan_comment = |
|
30573 | 311 |
Symbol_Pos.scan_pos -- (Symbol_Pos.scan_comment_body !!! -- Symbol_Pos.scan_pos); |
5825 | 312 |
|
313 |
||
27663 | 314 |
|
27769 | 315 |
(** token sources **) |
5825 | 316 |
|
27769 | 317 |
fun source_proper src = src |> Source.filter is_proper; |
5825 | 318 |
|
23678 | 319 |
local |
320 |
||
27769 | 321 |
fun token_leq ((_, syms1), (_, syms2)) = length syms1 <= length syms2; |
27780
7d0910f662f7
more precise positions due to SymbolsPos.implode_delim;
wenzelm
parents:
27769
diff
changeset
|
322 |
|
27799 | 323 |
fun token k ss = |
30573 | 324 |
Token ((Symbol_Pos.implode ss, Symbol_Pos.range ss), (k, Symbol_Pos.untabify_content ss), Slot); |
27799 | 325 |
|
326 |
fun token_range k (pos1, (ss, pos2)) = |
|
30573 | 327 |
Token (Symbol_Pos.implode_range pos1 pos2 ss, (k, Symbol_Pos.untabify_content ss), Slot); |
23678 | 328 |
|
27769 | 329 |
fun scan (lex1, lex2) = !!! "bad input" |
30586
9674f64a0702
moved basic change_prompt, scan_string, scan_alt_string, scan_quoted to symbol_pos.ML;
wenzelm
parents:
30573
diff
changeset
|
330 |
(Symbol_Pos.scan_string >> token_range String || |
9674f64a0702
moved basic change_prompt, scan_string, scan_alt_string, scan_quoted to symbol_pos.ML;
wenzelm
parents:
30573
diff
changeset
|
331 |
Symbol_Pos.scan_alt_string >> token_range AltString || |
27799 | 332 |
scan_verbatim >> token_range Verbatim || |
333 |
scan_comment >> token_range Comment || |
|
27780
7d0910f662f7
more precise positions due to SymbolsPos.implode_delim;
wenzelm
parents:
27769
diff
changeset
|
334 |
scan_space >> token Space || |
40525
14a2e686bdac
eliminated slightly odd pervasive Symbol_Pos.symbol;
wenzelm
parents:
40523
diff
changeset
|
335 |
Scan.one (Symbol.is_malformed o Symbol_Pos.symbol) >> (token Malformed o single) || |
14a2e686bdac
eliminated slightly odd pervasive Symbol_Pos.symbol;
wenzelm
parents:
40523
diff
changeset
|
336 |
Scan.one (Symbol.is_sync o Symbol_Pos.symbol) >> (token Sync o single) || |
27780
7d0910f662f7
more precise positions due to SymbolsPos.implode_delim;
wenzelm
parents:
27769
diff
changeset
|
337 |
(Scan.max token_leq |
27769 | 338 |
(Scan.max token_leq |
339 |
(Scan.literal lex2 >> pair Command) |
|
340 |
(Scan.literal lex1 >> pair Keyword)) |
|
341 |
(Syntax.scan_longid >> pair LongIdent || |
|
342 |
Syntax.scan_id >> pair Ident || |
|
343 |
Syntax.scan_var >> pair Var || |
|
344 |
Syntax.scan_tid >> pair TypeIdent || |
|
345 |
Syntax.scan_tvar >> pair TypeVar || |
|
40290
47f572aff50a
support for floating-point tokens in outer syntax (coinciding with inner syntax version);
wenzelm
parents:
38229
diff
changeset
|
346 |
Syntax.scan_float >> pair Float || |
27769 | 347 |
Syntax.scan_nat >> pair Nat || |
27780
7d0910f662f7
more precise positions due to SymbolsPos.implode_delim;
wenzelm
parents:
27769
diff
changeset
|
348 |
scan_symid >> pair SymIdent) >> uncurry token)); |
27769 | 349 |
|
350 |
fun recover msg = |
|
40525
14a2e686bdac
eliminated slightly odd pervasive Symbol_Pos.symbol;
wenzelm
parents:
40523
diff
changeset
|
351 |
Scan.many ((Symbol.is_regular andf (not o Symbol.is_blank)) o Symbol_Pos.symbol) |
27780
7d0910f662f7
more precise positions due to SymbolsPos.implode_delim;
wenzelm
parents:
27769
diff
changeset
|
352 |
>> (single o token (Error msg)); |
23678 | 353 |
|
354 |
in |
|
5825 | 355 |
|
27835
ff8b8513965a
Symbol.source/OuterLex.source: more explicit do_recover argument;
wenzelm
parents:
27814
diff
changeset
|
356 |
fun source' {do_recover} get_lex = |
30573 | 357 |
Source.source Symbol_Pos.stopper (Scan.bulk (fn xs => scan (get_lex ()) xs)) |
27780
7d0910f662f7
more precise positions due to SymbolsPos.implode_delim;
wenzelm
parents:
27769
diff
changeset
|
358 |
(Option.map (rpair recover) do_recover); |
7d0910f662f7
more precise positions due to SymbolsPos.implode_delim;
wenzelm
parents:
27769
diff
changeset
|
359 |
|
5825 | 360 |
fun source do_recover get_lex pos src = |
30573 | 361 |
Symbol_Pos.source pos src |
27780
7d0910f662f7
more precise positions due to SymbolsPos.implode_delim;
wenzelm
parents:
27769
diff
changeset
|
362 |
|> source' do_recover get_lex; |
23678 | 363 |
|
364 |
end; |
|
5825 | 365 |
|
30586
9674f64a0702
moved basic change_prompt, scan_string, scan_alt_string, scan_quoted to symbol_pos.ML;
wenzelm
parents:
30573
diff
changeset
|
366 |
|
9674f64a0702
moved basic change_prompt, scan_string, scan_alt_string, scan_quoted to symbol_pos.ML;
wenzelm
parents:
30573
diff
changeset
|
367 |
(* read_antiq *) |
9674f64a0702
moved basic change_prompt, scan_string, scan_alt_string, scan_quoted to symbol_pos.ML;
wenzelm
parents:
30573
diff
changeset
|
368 |
|
9674f64a0702
moved basic change_prompt, scan_string, scan_alt_string, scan_quoted to symbol_pos.ML;
wenzelm
parents:
30573
diff
changeset
|
369 |
fun read_antiq lex scan (syms, pos) = |
9674f64a0702
moved basic change_prompt, scan_string, scan_alt_string, scan_quoted to symbol_pos.ML;
wenzelm
parents:
30573
diff
changeset
|
370 |
let |
9674f64a0702
moved basic change_prompt, scan_string, scan_alt_string, scan_quoted to symbol_pos.ML;
wenzelm
parents:
30573
diff
changeset
|
371 |
fun err msg = cat_error msg ("Malformed antiquotation" ^ Position.str_of pos ^ ":\n" ^ |
9674f64a0702
moved basic change_prompt, scan_string, scan_alt_string, scan_quoted to symbol_pos.ML;
wenzelm
parents:
30573
diff
changeset
|
372 |
"@{" ^ Symbol_Pos.content syms ^ "}"); |
9674f64a0702
moved basic change_prompt, scan_string, scan_alt_string, scan_quoted to symbol_pos.ML;
wenzelm
parents:
30573
diff
changeset
|
373 |
|
9674f64a0702
moved basic change_prompt, scan_string, scan_alt_string, scan_quoted to symbol_pos.ML;
wenzelm
parents:
30573
diff
changeset
|
374 |
val res = |
9674f64a0702
moved basic change_prompt, scan_string, scan_alt_string, scan_quoted to symbol_pos.ML;
wenzelm
parents:
30573
diff
changeset
|
375 |
Source.of_list syms |
9674f64a0702
moved basic change_prompt, scan_string, scan_alt_string, scan_quoted to symbol_pos.ML;
wenzelm
parents:
30573
diff
changeset
|
376 |
|> source' {do_recover = NONE} (K (lex, Scan.empty_lexicon)) |
9674f64a0702
moved basic change_prompt, scan_string, scan_alt_string, scan_quoted to symbol_pos.ML;
wenzelm
parents:
30573
diff
changeset
|
377 |
|> source_proper |
9674f64a0702
moved basic change_prompt, scan_string, scan_alt_string, scan_quoted to symbol_pos.ML;
wenzelm
parents:
30573
diff
changeset
|
378 |
|> Source.source stopper (Scan.error (Scan.bulk scan)) NONE |
9674f64a0702
moved basic change_prompt, scan_string, scan_alt_string, scan_quoted to symbol_pos.ML;
wenzelm
parents:
30573
diff
changeset
|
379 |
|> Source.exhaust; |
9674f64a0702
moved basic change_prompt, scan_string, scan_alt_string, scan_quoted to symbol_pos.ML;
wenzelm
parents:
30573
diff
changeset
|
380 |
in (case res of [x] => x | _ => err "") handle ERROR msg => err msg end; |
9674f64a0702
moved basic change_prompt, scan_string, scan_alt_string, scan_quoted to symbol_pos.ML;
wenzelm
parents:
30573
diff
changeset
|
381 |
|
5825 | 382 |
end; |