Initial commit: ml-yacc support for Isabelle.
This commit is contained in:
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01d66798d3
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(******************************************************************************
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* STANDARD ML OF NEW JERSEY COPYRIGHT NOTICE, LICENSE AND DISCLAIMER.
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*
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* Copyright (c) 1989-2002 by Lucent Technologies
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*
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* Permission to use, copy, modify, and distribute this software and its
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|
* documentation for any purpose and without fee is hereby granted,
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* provided that the above copyright notice appear in all copies and that
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|
* both the copyright notice and this permission notice and warranty
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||||||
|
* disclaimer appear in supporting documentation, and that the name of
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|
* Lucent Technologies, Bell Labs or any Lucent entity not be used in
|
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|
* advertising or publicity pertaining to distribution of the software
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|
* without specific, written prior permission.
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||||||
|
*
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* Lucent disclaims all warranties with regard to this software,
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|
* including all implied warranties of merchantability and fitness. In no
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* event shall Lucent be liable for any special, indirect or
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|
* consequential damages or any damages whatsoever resulting from loss of
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* use, data or profits, whether in an action of contract, negligence or
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|
* other tortious action, arising out of or in connection with the use
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* or performance of this software.
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******************************************************************************)
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(* $Id$ *)
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(* ML-Yacc Parser Generator (c) 1989 Andrew W. Appel, David R. Tarditi *)
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(* base.sig: Base signature file for SML-Yacc. This file contains signatures
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that must be loaded before any of the files produced by ML-Yacc are loaded
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*)
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(* STREAM: signature for a lazy stream.*)
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signature STREAM =
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sig type 'xa stream
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val streamify : (unit -> '_a) -> '_a stream
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val cons : '_a * '_a stream -> '_a stream
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val get : '_a stream -> '_a * '_a stream
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end
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(* LR_TABLE: signature for an LR Table.
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The list of actions and gotos passed to mkLrTable must be ordered by state
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number. The values for state 0 are the first in the list, the values for
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state 1 are next, etc.
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*)
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signature LR_TABLE =
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sig
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datatype ('a,'b) pairlist = EMPTY | PAIR of 'a * 'b * ('a,'b) pairlist
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datatype state = STATE of int
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datatype term = T of int
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datatype nonterm = NT of int
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datatype action = SHIFT of state
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| REDUCE of int
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| ACCEPT
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| ERROR
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type table
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val numStates : table -> int
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val numRules : table -> int
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val describeActions : table -> state ->
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(term,action) pairlist * action
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val describeGoto : table -> state -> (nonterm,state) pairlist
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val action : table -> state * term -> action
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val goto : table -> state * nonterm -> state
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val initialState : table -> state
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exception Goto of state * nonterm
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val mkLrTable : {actions : ((term,action) pairlist * action) array,
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gotos : (nonterm,state) pairlist array,
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numStates : int, numRules : int,
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initialState : state} -> table
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end
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(* TOKEN: signature revealing the internal structure of a token. This signature
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TOKEN distinct from the signature {parser name}_TOKENS produced by ML-Yacc.
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The {parser name}_TOKENS structures contain some types and functions to
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construct tokens from values and positions.
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The representation of token was very carefully chosen here to allow the
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polymorphic parser to work without knowing the types of semantic values
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or line numbers.
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This has had an impact on the TOKENS structure produced by SML-Yacc, which
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is a structure parameter to lexer functors. We would like to have some
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type 'a token which functions to construct tokens would create. A
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constructor function for a integer token might be
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INT: int * 'a * 'a -> 'a token.
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This is not possible because we need to have tokens with the representation
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given below for the polymorphic parser.
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Thus our constructur functions for tokens have the form:
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INT: int * 'a * 'a -> (svalue,'a) token
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This in turn has had an impact on the signature that lexers for SML-Yacc
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must match and the types that a user must declare in the user declarations
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section of lexers.
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*)
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signature TOKEN =
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sig
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structure LrTable : LR_TABLE
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datatype ('a,'b) token = TOKEN of LrTable.term * ('a * 'b * 'b)
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val sameToken : ('a,'b) token * ('a,'b) token -> bool
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end
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(* LR_PARSER: signature for a polymorphic LR parser *)
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signature LR_PARSER =
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sig
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structure Stream: STREAM
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structure LrTable : LR_TABLE
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structure Token : TOKEN
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sharing LrTable = Token.LrTable
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exception ParseError
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val parse : {table : LrTable.table,
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lexer : ('_b,'_c) Token.token Stream.stream,
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arg: 'arg,
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saction : int *
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'_c *
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(LrTable.state * ('_b * '_c * '_c)) list *
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'arg ->
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LrTable.nonterm *
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('_b * '_c * '_c) *
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((LrTable.state *('_b * '_c * '_c)) list),
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void : '_b,
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ec : { is_keyword : LrTable.term -> bool,
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noShift : LrTable.term -> bool,
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preferred_change : (LrTable.term list * LrTable.term list) list,
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errtermvalue : LrTable.term -> '_b,
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showTerminal : LrTable.term -> string,
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terms: LrTable.term list,
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error : string * '_c * '_c -> unit
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},
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lookahead : int (* max amount of lookahead used in *)
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(* error correction *)
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} -> '_b *
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(('_b,'_c) Token.token Stream.stream)
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end
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(* LEXER: a signature that most lexers produced for use with SML-Yacc's
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output will match. The user is responsible for declaring type token,
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type pos, and type svalue in the UserDeclarations section of a lexer.
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Note that type token is abstract in the lexer. This allows SML-Yacc to
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create a TOKENS signature for use with lexers produced by ML-Lex that
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treats the type token abstractly. Lexers that are functors parametrized by
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a Tokens structure matching a TOKENS signature cannot examine the structure
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of tokens.
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*)
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signature LEXER =
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sig
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structure UserDeclarations :
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sig
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type ('a,'b) token
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type pos
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type svalue
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end
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val makeLexer : (int -> string) -> unit ->
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(UserDeclarations.svalue,UserDeclarations.pos) UserDeclarations.token
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end
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(* ARG_LEXER: the %arg option of ML-Lex allows users to produce lexers which
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also take an argument before yielding a function from unit to a token
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*)
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signature ARG_LEXER =
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sig
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structure UserDeclarations :
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sig
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type ('a,'b) token
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type pos
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type svalue
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type arg
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end
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val makeLexer : (int -> string) -> UserDeclarations.arg -> unit ->
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(UserDeclarations.svalue,UserDeclarations.pos) UserDeclarations.token
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end
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(* PARSER_DATA: the signature of ParserData structures in {parser name}LrValsFun
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produced by SML-Yacc. All such structures match this signature.
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The {parser name}LrValsFun produces a structure which contains all the values
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except for the lexer needed to call the polymorphic parser mentioned
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before.
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*)
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signature PARSER_DATA =
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sig
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(* the type of line numbers *)
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type pos
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(* the type of semantic values *)
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type svalue
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(* the type of the user-supplied argument to the parser *)
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type arg
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(* the intended type of the result of the parser. This value is
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produced by applying extract from the structure Actions to the
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final semantic value resultiing from a parse.
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*)
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type result
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structure LrTable : LR_TABLE
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structure Token : TOKEN
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sharing Token.LrTable = LrTable
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(* structure Actions contains the functions which mantain the
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semantic values stack in the parser. Void is used to provide
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a default value for the semantic stack.
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*)
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structure Actions :
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sig
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val actions : int * pos *
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(LrTable.state * (svalue * pos * pos)) list * arg->
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LrTable.nonterm * (svalue * pos * pos) *
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((LrTable.state *(svalue * pos * pos)) list)
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val void : svalue
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val extract : svalue -> result
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end
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(* structure EC contains information used to improve error
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recovery in an error-correcting parser *)
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structure EC :
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sig
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val is_keyword : LrTable.term -> bool
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val noShift : LrTable.term -> bool
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val preferred_change : (LrTable.term list * LrTable.term list) list
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val errtermvalue : LrTable.term -> svalue
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val showTerminal : LrTable.term -> string
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val terms: LrTable.term list
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end
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(* table is the LR table for the parser *)
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val table : LrTable.table
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end
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(* signature PARSER is the signature that most user parsers created by
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SML-Yacc will match.
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*)
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signature PARSER =
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sig
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structure Token : TOKEN
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structure Stream : STREAM
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exception ParseError
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(* type pos is the type of line numbers *)
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type pos
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(* type result is the type of the result from the parser *)
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type result
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(* the type of the user-supplied argument to the parser *)
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type arg
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(* type svalue is the type of semantic values for the semantic value
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stack
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*)
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type svalue
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(* val makeLexer is used to create a stream of tokens for the parser *)
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val makeLexer : (int -> string) ->
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(svalue,pos) Token.token Stream.stream
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(* val parse takes a stream of tokens and a function to print
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errors and returns a value of type result and a stream containing
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the unused tokens
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*)
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val parse : int * ((svalue,pos) Token.token Stream.stream) *
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(string * pos * pos -> unit) * arg ->
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result * (svalue,pos) Token.token Stream.stream
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val sameToken : (svalue,pos) Token.token * (svalue,pos) Token.token ->
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bool
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end
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(* signature ARG_PARSER is the signature that will be matched by parsers whose
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lexer takes an additional argument.
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*)
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signature ARG_PARSER =
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sig
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structure Token : TOKEN
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structure Stream : STREAM
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exception ParseError
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type arg
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type lexarg
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type pos
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type result
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type svalue
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val makeLexer : (int -> string) -> lexarg ->
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(svalue,pos) Token.token Stream.stream
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val parse : int * ((svalue,pos) Token.token Stream.stream) *
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(string * pos * pos -> unit) * arg ->
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result * (svalue,pos) Token.token Stream.stream
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val sameToken : (svalue,pos) Token.token * (svalue,pos) Token.token ->
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bool
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end
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@ -0,0 +1,40 @@
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This package was debianized by Aaron Matthew Read <amread@nyx.net> on
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Fri, 25 Oct 2002 16:54:10 -0800.
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It was downloaded from http://smlnj.cs.uchicago.edu/dist/working
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Upstream Authors: The SML/NJ Team <smlnj-dev-list@lists.sourceforge.net>
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Copyright: 2003-2008 The SML/NJ Fellowship
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1989-2002 Lucent Technologies
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1991-2003 John Reppy
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1996-1998,2000 YALE FLINT PROJECT
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1992 Vrije Universiteit, The Netherlands
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1989-1992 Andrew W. Appel, James S. Mattson, David R. Tarditi
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1988 Evans & Sutherland Computer Corporation, Salt Lake City, Utah
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STANDARD ML OF NEW JERSEY COPYRIGHT NOTICE, LICENSE AND DISCLAIMER.
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|
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|
Copyright (c) 1989-2002 by Lucent Technologies
|
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|
|
||||||
|
Permission to use, copy, modify, and distribute this software and its
|
||||||
|
documentation for any purpose and without fee is hereby granted,
|
||||||
|
provided that the above copyright notice appear in all copies and that
|
||||||
|
both the copyright notice and this permission notice and warranty
|
||||||
|
disclaimer appear in supporting documentation, and that the name of
|
||||||
|
Lucent Technologies, Bell Labs or any Lucent entity not be used in
|
||||||
|
advertising or publicity pertaining to distribution of the software
|
||||||
|
without specific, written prior permission.
|
||||||
|
|
||||||
|
Lucent disclaims all warranties with regard to this software,
|
||||||
|
including all implied warranties of merchantability and fitness. In no
|
||||||
|
event shall Lucent be liable for any special, indirect or
|
||||||
|
consequential damages or any damages whatsoever resulting from loss of
|
||||||
|
use, data or profits, whether in an action of contract, negligence or
|
||||||
|
other tortious action, arising out of or in connection with the use
|
||||||
|
or performance of this software.
|
||||||
|
|
||||||
|
|
||||||
|
The SML/NJ distribution also includes code licensed under the same
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|
terms as above, but with "David R. Tarditi Jr. and Andrew W. Appel",
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|
"Vrije Universiteit" or "Evans & Sutherland" instead of "Lucent".
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@ -0,0 +1,118 @@
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(******************************************************************************
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||||||
|
* STANDARD ML OF NEW JERSEY COPYRIGHT NOTICE, LICENSE AND DISCLAIMER.
|
||||||
|
*
|
||||||
|
* Copyright (c) 1989-2002 by Lucent Technologies
|
||||||
|
*
|
||||||
|
* Permission to use, copy, modify, and distribute this software and its
|
||||||
|
* documentation for any purpose and without fee is hereby granted,
|
||||||
|
* provided that the above copyright notice appear in all copies and that
|
||||||
|
* both the copyright notice and this permission notice and warranty
|
||||||
|
* disclaimer appear in supporting documentation, and that the name of
|
||||||
|
* Lucent Technologies, Bell Labs or any Lucent entity not be used in
|
||||||
|
* advertising or publicity pertaining to distribution of the software
|
||||||
|
* without specific, written prior permission.
|
||||||
|
*
|
||||||
|
* Lucent disclaims all warranties with regard to this software,
|
||||||
|
* including all implied warranties of merchantability and fitness. In no
|
||||||
|
* event shall Lucent be liable for any special, indirect or
|
||||||
|
* consequential damages or any damages whatsoever resulting from loss of
|
||||||
|
* use, data or profits, whether in an action of contract, negligence or
|
||||||
|
* other tortious action, arising out of or in connection with the use
|
||||||
|
* or performance of this software.
|
||||||
|
******************************************************************************)
|
||||||
|
(* $Id$ *)
|
||||||
|
|
||||||
|
(* ML-Yacc Parser Generator (c) 1989 Andrew W. Appel, David R. Tarditi *)
|
||||||
|
|
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|
(* functor Join creates a user parser by putting together a Lexer structure,
|
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|
an LrValues structure, and a polymorphic parser structure. Note that
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||||||
|
the Lexer and LrValues structure must share the type pos (i.e. the type
|
||||||
|
of line numbers), the type svalues for semantic values, and the type
|
||||||
|
of tokens.
|
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|
*)
|
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|
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|
functor Join(structure Lex : LEXER
|
||||||
|
structure ParserData: PARSER_DATA
|
||||||
|
structure LrParser : LR_PARSER
|
||||||
|
sharing ParserData.LrTable = LrParser.LrTable
|
||||||
|
sharing ParserData.Token = LrParser.Token
|
||||||
|
sharing type Lex.UserDeclarations.svalue = ParserData.svalue
|
||||||
|
sharing type Lex.UserDeclarations.pos = ParserData.pos
|
||||||
|
sharing type Lex.UserDeclarations.token = ParserData.Token.token)
|
||||||
|
: PARSER =
|
||||||
|
struct
|
||||||
|
structure Token = ParserData.Token
|
||||||
|
structure Stream = LrParser.Stream
|
||||||
|
|
||||||
|
exception ParseError = LrParser.ParseError
|
||||||
|
|
||||||
|
type arg = ParserData.arg
|
||||||
|
type pos = ParserData.pos
|
||||||
|
type result = ParserData.result
|
||||||
|
type svalue = ParserData.svalue
|
||||||
|
val makeLexer = LrParser.Stream.streamify o Lex.makeLexer
|
||||||
|
val parse = fn (lookahead,lexer,error,arg) =>
|
||||||
|
(fn (a,b) => (ParserData.Actions.extract a,b))
|
||||||
|
(LrParser.parse {table = ParserData.table,
|
||||||
|
lexer=lexer,
|
||||||
|
lookahead=lookahead,
|
||||||
|
saction = ParserData.Actions.actions,
|
||||||
|
arg=arg,
|
||||||
|
void= ParserData.Actions.void,
|
||||||
|
ec = {is_keyword = ParserData.EC.is_keyword,
|
||||||
|
noShift = ParserData.EC.noShift,
|
||||||
|
preferred_change = ParserData.EC.preferred_change,
|
||||||
|
errtermvalue = ParserData.EC.errtermvalue,
|
||||||
|
error=error,
|
||||||
|
showTerminal = ParserData.EC.showTerminal,
|
||||||
|
terms = ParserData.EC.terms}}
|
||||||
|
)
|
||||||
|
val sameToken = Token.sameToken
|
||||||
|
end
|
||||||
|
|
||||||
|
(* functor JoinWithArg creates a variant of the parser structure produced
|
||||||
|
above. In this case, the makeLexer take an additional argument before
|
||||||
|
yielding a value of type unit -> (svalue,pos) token
|
||||||
|
*)
|
||||||
|
|
||||||
|
functor JoinWithArg(structure Lex : ARG_LEXER
|
||||||
|
structure ParserData: PARSER_DATA
|
||||||
|
structure LrParser : LR_PARSER
|
||||||
|
sharing ParserData.LrTable = LrParser.LrTable
|
||||||
|
sharing ParserData.Token = LrParser.Token
|
||||||
|
sharing type Lex.UserDeclarations.svalue = ParserData.svalue
|
||||||
|
sharing type Lex.UserDeclarations.pos = ParserData.pos
|
||||||
|
sharing type Lex.UserDeclarations.token = ParserData.Token.token)
|
||||||
|
: ARG_PARSER =
|
||||||
|
struct
|
||||||
|
structure Token = ParserData.Token
|
||||||
|
structure Stream = LrParser.Stream
|
||||||
|
|
||||||
|
exception ParseError = LrParser.ParseError
|
||||||
|
|
||||||
|
type arg = ParserData.arg
|
||||||
|
type lexarg = Lex.UserDeclarations.arg
|
||||||
|
type pos = ParserData.pos
|
||||||
|
type result = ParserData.result
|
||||||
|
type svalue = ParserData.svalue
|
||||||
|
|
||||||
|
val makeLexer = fn s => fn arg =>
|
||||||
|
LrParser.Stream.streamify (Lex.makeLexer s arg)
|
||||||
|
val parse = fn (lookahead,lexer,error,arg) =>
|
||||||
|
(fn (a,b) => (ParserData.Actions.extract a,b))
|
||||||
|
(LrParser.parse {table = ParserData.table,
|
||||||
|
lexer=lexer,
|
||||||
|
lookahead=lookahead,
|
||||||
|
saction = ParserData.Actions.actions,
|
||||||
|
arg=arg,
|
||||||
|
void= ParserData.Actions.void,
|
||||||
|
ec = {is_keyword = ParserData.EC.is_keyword,
|
||||||
|
noShift = ParserData.EC.noShift,
|
||||||
|
preferred_change = ParserData.EC.preferred_change,
|
||||||
|
errtermvalue = ParserData.EC.errtermvalue,
|
||||||
|
error=error,
|
||||||
|
showTerminal = ParserData.EC.showTerminal,
|
||||||
|
terms = ParserData.EC.terms}}
|
||||||
|
)
|
||||||
|
val sameToken = Token.sameToken
|
||||||
|
end;
|
|
@ -0,0 +1,83 @@
|
||||||
|
(******************************************************************************
|
||||||
|
* STANDARD ML OF NEW JERSEY COPYRIGHT NOTICE, LICENSE AND DISCLAIMER.
|
||||||
|
*
|
||||||
|
* Copyright (c) 1989-2002 by Lucent Technologies
|
||||||
|
*
|
||||||
|
* Permission to use, copy, modify, and distribute this software and its
|
||||||
|
* documentation for any purpose and without fee is hereby granted,
|
||||||
|
* provided that the above copyright notice appear in all copies and that
|
||||||
|
* both the copyright notice and this permission notice and warranty
|
||||||
|
* disclaimer appear in supporting documentation, and that the name of
|
||||||
|
* Lucent Technologies, Bell Labs or any Lucent entity not be used in
|
||||||
|
* advertising or publicity pertaining to distribution of the software
|
||||||
|
* without specific, written prior permission.
|
||||||
|
*
|
||||||
|
* Lucent disclaims all warranties with regard to this software,
|
||||||
|
* including all implied warranties of merchantability and fitness. In no
|
||||||
|
* event shall Lucent be liable for any special, indirect or
|
||||||
|
* consequential damages or any damages whatsoever resulting from loss of
|
||||||
|
* use, data or profits, whether in an action of contract, negligence or
|
||||||
|
* other tortious action, arising out of or in connection with the use
|
||||||
|
* or performance of this software.
|
||||||
|
******************************************************************************)
|
||||||
|
(* $Id$ *)
|
||||||
|
|
||||||
|
(* ML-Yacc Parser Generator (c) 1989 Andrew W. Appel, David R. Tarditi *)
|
||||||
|
structure LrTable : LR_TABLE =
|
||||||
|
struct
|
||||||
|
open Array List
|
||||||
|
infix 9 sub
|
||||||
|
datatype ('a,'b) pairlist = EMPTY
|
||||||
|
| PAIR of 'a * 'b * ('a,'b) pairlist
|
||||||
|
datatype term = T of int
|
||||||
|
datatype nonterm = NT of int
|
||||||
|
datatype state = STATE of int
|
||||||
|
datatype action = SHIFT of state
|
||||||
|
| REDUCE of int (* rulenum from grammar *)
|
||||||
|
| ACCEPT
|
||||||
|
| ERROR
|
||||||
|
exception Goto of state * nonterm
|
||||||
|
type table = {states: int, rules : int,initialState: state,
|
||||||
|
action: ((term,action) pairlist * action) array,
|
||||||
|
goto : (nonterm,state) pairlist array}
|
||||||
|
val numStates = fn ({states,...} : table) => states
|
||||||
|
val numRules = fn ({rules,...} : table) => rules
|
||||||
|
val describeActions =
|
||||||
|
fn ({action,...} : table) =>
|
||||||
|
fn (STATE s) => action sub s
|
||||||
|
val describeGoto =
|
||||||
|
fn ({goto,...} : table) =>
|
||||||
|
fn (STATE s) => goto sub s
|
||||||
|
fun findTerm (T term,row,default) =
|
||||||
|
let fun find (PAIR (T key,data,r)) =
|
||||||
|
if key < term then find r
|
||||||
|
else if key=term then data
|
||||||
|
else default
|
||||||
|
| find EMPTY = default
|
||||||
|
in find row
|
||||||
|
end
|
||||||
|
fun findNonterm (NT nt,row) =
|
||||||
|
let fun find (PAIR (NT key,data,r)) =
|
||||||
|
if key < nt then find r
|
||||||
|
else if key=nt then SOME data
|
||||||
|
else NONE
|
||||||
|
| find EMPTY = NONE
|
||||||
|
in find row
|
||||||
|
end
|
||||||
|
val action = fn ({action,...} : table) =>
|
||||||
|
fn (STATE state,term) =>
|
||||||
|
let val (row,default) = action sub state
|
||||||
|
in findTerm(term,row,default)
|
||||||
|
end
|
||||||
|
val goto = fn ({goto,...} : table) =>
|
||||||
|
fn (a as (STATE state,nonterm)) =>
|
||||||
|
case findNonterm(nonterm,goto sub state)
|
||||||
|
of SOME state => state
|
||||||
|
| NONE => raise (Goto a)
|
||||||
|
val initialState = fn ({initialState,...} : table) => initialState
|
||||||
|
val mkLrTable = fn {actions,gotos,initialState,numStates,numRules} =>
|
||||||
|
({action=actions,goto=gotos,
|
||||||
|
states=numStates,
|
||||||
|
rules=numRules,
|
||||||
|
initialState=initialState} : table)
|
||||||
|
end;
|
|
@ -0,0 +1,567 @@
|
||||||
|
(******************************************************************************
|
||||||
|
* STANDARD ML OF NEW JERSEY COPYRIGHT NOTICE, LICENSE AND DISCLAIMER.
|
||||||
|
*
|
||||||
|
* Copyright (c) 1989-2002 by Lucent Technologies
|
||||||
|
*
|
||||||
|
* Permission to use, copy, modify, and distribute this software and its
|
||||||
|
* documentation for any purpose and without fee is hereby granted,
|
||||||
|
* provided that the above copyright notice appear in all copies and that
|
||||||
|
* both the copyright notice and this permission notice and warranty
|
||||||
|
* disclaimer appear in supporting documentation, and that the name of
|
||||||
|
* Lucent Technologies, Bell Labs or any Lucent entity not be used in
|
||||||
|
* advertising or publicity pertaining to distribution of the software
|
||||||
|
* without specific, written prior permission.
|
||||||
|
*
|
||||||
|
* Lucent disclaims all warranties with regard to this software,
|
||||||
|
* including all implied warranties of merchantability and fitness. In no
|
||||||
|
* event shall Lucent be liable for any special, indirect or
|
||||||
|
* consequential damages or any damages whatsoever resulting from loss of
|
||||||
|
* use, data or profits, whether in an action of contract, negligence or
|
||||||
|
* other tortious action, arising out of or in connection with the use
|
||||||
|
* or performance of this software.
|
||||||
|
******************************************************************************)
|
||||||
|
(* $Id$ *)
|
||||||
|
|
||||||
|
(* ML-Yacc Parser Generator (c) 1989 Andrew W. Appel, David R. Tarditi *)
|
||||||
|
|
||||||
|
(* parser.sml: This is a parser driver for LR tables with an error-recovery
|
||||||
|
routine added to it. The routine used is described in detail in this
|
||||||
|
article:
|
||||||
|
|
||||||
|
'A Practical Method for LR and LL Syntactic Error Diagnosis and
|
||||||
|
Recovery', by M. Burke and G. Fisher, ACM Transactions on
|
||||||
|
Programming Langauges and Systems, Vol. 9, No. 2, April 1987,
|
||||||
|
pp. 164-197.
|
||||||
|
|
||||||
|
This program is an implementation is the partial, deferred method discussed
|
||||||
|
in the article. The algorithm and data structures used in the program
|
||||||
|
are described below.
|
||||||
|
|
||||||
|
This program assumes that all semantic actions are delayed. A semantic
|
||||||
|
action should produce a function from unit -> value instead of producing the
|
||||||
|
normal value. The parser returns the semantic value on the top of the
|
||||||
|
stack when accept is encountered. The user can deconstruct this value
|
||||||
|
and apply the unit -> value function in it to get the answer.
|
||||||
|
|
||||||
|
It also assumes that the lexer is a lazy stream.
|
||||||
|
|
||||||
|
Data Structures:
|
||||||
|
----------------
|
||||||
|
|
||||||
|
* The parser:
|
||||||
|
|
||||||
|
The state stack has the type
|
||||||
|
|
||||||
|
(state * (semantic value * line # * line #)) list
|
||||||
|
|
||||||
|
The parser keeps a queue of (state stack * lexer pair). A lexer pair
|
||||||
|
consists of a terminal * value pair and a lexer. This allows the
|
||||||
|
parser to reconstruct the states for terminals to the left of a
|
||||||
|
syntax error, and attempt to make error corrections there.
|
||||||
|
|
||||||
|
The queue consists of a pair of lists (x,y). New additions to
|
||||||
|
the queue are cons'ed onto y. The first element of x is the top
|
||||||
|
of the queue. If x is nil, then y is reversed and used
|
||||||
|
in place of x.
|
||||||
|
|
||||||
|
Algorithm:
|
||||||
|
----------
|
||||||
|
|
||||||
|
* The steady-state parser:
|
||||||
|
|
||||||
|
This parser keeps the length of the queue of state stacks at
|
||||||
|
a steady state by always removing an element from the front when
|
||||||
|
another element is placed on the end.
|
||||||
|
|
||||||
|
It has these arguments:
|
||||||
|
|
||||||
|
stack: current stack
|
||||||
|
queue: value of the queue
|
||||||
|
lexPair ((terminal,value),lex stream)
|
||||||
|
|
||||||
|
When SHIFT is encountered, the state to shift to and the value are
|
||||||
|
are pushed onto the state stack. The state stack and lexPair are
|
||||||
|
placed on the queue. The front element of the queue is removed.
|
||||||
|
|
||||||
|
When REDUCTION is encountered, the rule is applied to the current
|
||||||
|
stack to yield a triple (nonterm,value,new stack). A new
|
||||||
|
stack is formed by adding (goto(top state of stack,nonterm),value)
|
||||||
|
to the stack.
|
||||||
|
|
||||||
|
When ACCEPT is encountered, the top value from the stack and the
|
||||||
|
lexer are returned.
|
||||||
|
|
||||||
|
When an ERROR is encountered, fixError is called. FixError
|
||||||
|
takes the arguments to the parser, fixes the error if possible and
|
||||||
|
returns a new set of arguments.
|
||||||
|
|
||||||
|
* The distance-parser:
|
||||||
|
|
||||||
|
This parser includes an additional argument distance. It pushes
|
||||||
|
elements on the queue until it has parsed distance tokens, or an
|
||||||
|
ACCEPT or ERROR occurs. It returns a stack, lexer, the number of
|
||||||
|
tokens left unparsed, a queue, and an action option.
|
||||||
|
*)
|
||||||
|
|
||||||
|
signature FIFO =
|
||||||
|
sig type 'a queue
|
||||||
|
val empty : 'a queue
|
||||||
|
exception Empty
|
||||||
|
val get : 'a queue -> 'a * 'a queue
|
||||||
|
val put : 'a * 'a queue -> 'a queue
|
||||||
|
end
|
||||||
|
|
||||||
|
(* drt (12/15/89) -- the functor should be used in development work, but
|
||||||
|
it wastes space in the release version.
|
||||||
|
|
||||||
|
functor ParserGen(structure LrTable : LR_TABLE
|
||||||
|
structure Stream : STREAM) : LR_PARSER =
|
||||||
|
*)
|
||||||
|
|
||||||
|
structure LrParser :> LR_PARSER =
|
||||||
|
struct
|
||||||
|
structure LrTable = LrTable
|
||||||
|
structure Stream = Stream
|
||||||
|
|
||||||
|
val print = warning (* fn s => TextIO.output(TextIO.stdOut,s) *)
|
||||||
|
fun eqT (LrTable.T i, LrTable.T i') = i = i'
|
||||||
|
|
||||||
|
structure Token : TOKEN =
|
||||||
|
struct
|
||||||
|
structure LrTable = LrTable
|
||||||
|
datatype ('a,'b) token = TOKEN of LrTable.term * ('a * 'b * 'b)
|
||||||
|
val sameToken = fn (TOKEN(t,_),TOKEN(t',_)) => eqT (t,t')
|
||||||
|
end
|
||||||
|
|
||||||
|
open LrTable
|
||||||
|
open Token
|
||||||
|
|
||||||
|
val DEBUG1 = false
|
||||||
|
val DEBUG2 = false
|
||||||
|
exception ParseError
|
||||||
|
exception ParseImpossible of int
|
||||||
|
|
||||||
|
structure Fifo :> FIFO =
|
||||||
|
struct
|
||||||
|
type 'a queue = ('a list * 'a list)
|
||||||
|
val empty = (nil,nil)
|
||||||
|
exception Empty
|
||||||
|
fun get(a::x, y) = (a, (x,y))
|
||||||
|
| get(nil, nil) = raise Empty
|
||||||
|
| get(nil, y) = get(rev y, nil)
|
||||||
|
fun put(a,(x,y)) = (x,a::y)
|
||||||
|
end
|
||||||
|
|
||||||
|
type ('a,'b) elem = (state * ('a * 'b * 'b))
|
||||||
|
type ('a,'b) stack = ('a,'b) elem list
|
||||||
|
type ('a,'b) lexv = ('a,'b) token
|
||||||
|
type ('a,'b) lexpair = ('a,'b) lexv * (('a,'b) lexv Stream.stream)
|
||||||
|
type ('a,'b) distanceParse =
|
||||||
|
('a,'b) lexpair *
|
||||||
|
('a,'b) stack *
|
||||||
|
(('a,'b) stack * ('a,'b) lexpair) Fifo.queue *
|
||||||
|
int ->
|
||||||
|
('a,'b) lexpair *
|
||||||
|
('a,'b) stack *
|
||||||
|
(('a,'b) stack * ('a,'b) lexpair) Fifo.queue *
|
||||||
|
int *
|
||||||
|
action option
|
||||||
|
|
||||||
|
type ('a,'b) ecRecord =
|
||||||
|
{is_keyword : term -> bool,
|
||||||
|
preferred_change : (term list * term list) list,
|
||||||
|
error : string * 'b * 'b -> unit,
|
||||||
|
errtermvalue : term -> 'a,
|
||||||
|
terms : term list,
|
||||||
|
showTerminal : term -> string,
|
||||||
|
noShift : term -> bool}
|
||||||
|
|
||||||
|
local
|
||||||
|
val print = warning (* fn s => TextIO.output(TextIO.stdOut,s) *)
|
||||||
|
val println = fn s => (print s; print "\n")
|
||||||
|
val showState = fn (STATE s) => "STATE " ^ (Int.toString s)
|
||||||
|
in
|
||||||
|
fun printStack(stack: ('a,'b) stack, n: int) =
|
||||||
|
case stack
|
||||||
|
of (state,_) :: rest =>
|
||||||
|
(print("\t" ^ Int.toString n ^ ": ");
|
||||||
|
println(showState state);
|
||||||
|
printStack(rest, n+1))
|
||||||
|
| nil => ()
|
||||||
|
|
||||||
|
fun prAction showTerminal
|
||||||
|
(stack as (state,_) :: _, next as (TOKEN (term,_),_), action) =
|
||||||
|
(println "Parse: state stack:";
|
||||||
|
printStack(stack, 0);
|
||||||
|
print(" state="
|
||||||
|
^ showState state
|
||||||
|
^ " next="
|
||||||
|
^ showTerminal term
|
||||||
|
^ " action="
|
||||||
|
);
|
||||||
|
case action
|
||||||
|
of SHIFT state => println ("SHIFT " ^ (showState state))
|
||||||
|
| REDUCE i => println ("REDUCE " ^ (Int.toString i))
|
||||||
|
| ERROR => println "ERROR"
|
||||||
|
| ACCEPT => println "ACCEPT")
|
||||||
|
| prAction _ (_,_,action) = ()
|
||||||
|
end
|
||||||
|
|
||||||
|
(* ssParse: parser which maintains the queue of (state * lexvalues) in a
|
||||||
|
steady-state. It takes a table, showTerminal function, saction
|
||||||
|
function, and fixError function. It parses until an ACCEPT is
|
||||||
|
encountered, or an exception is raised. When an error is encountered,
|
||||||
|
fixError is called with the arguments of parseStep (lexv,stack,and
|
||||||
|
queue). It returns the lexv, and a new stack and queue adjusted so
|
||||||
|
that the lexv can be parsed *)
|
||||||
|
|
||||||
|
val ssParse =
|
||||||
|
fn (table,showTerminal,saction,fixError,arg) =>
|
||||||
|
let val prAction = prAction showTerminal
|
||||||
|
val action = LrTable.action table
|
||||||
|
val goto = LrTable.goto table
|
||||||
|
fun parseStep(args as
|
||||||
|
(lexPair as (TOKEN (terminal, value as (_,leftPos,_)),
|
||||||
|
lexer
|
||||||
|
),
|
||||||
|
stack as (state,_) :: _,
|
||||||
|
queue)) =
|
||||||
|
let val nextAction = action (state,terminal)
|
||||||
|
val _ = if DEBUG1 then prAction(stack,lexPair,nextAction)
|
||||||
|
else ()
|
||||||
|
in case nextAction
|
||||||
|
of SHIFT s =>
|
||||||
|
let val newStack = (s,value) :: stack
|
||||||
|
val newLexPair = Stream.get lexer
|
||||||
|
val (_,newQueue) =Fifo.get(Fifo.put((newStack,newLexPair),
|
||||||
|
queue))
|
||||||
|
in parseStep(newLexPair,(s,value)::stack,newQueue)
|
||||||
|
end
|
||||||
|
| REDUCE i =>
|
||||||
|
(case saction(i,leftPos,stack,arg)
|
||||||
|
of (nonterm,value,stack as (state,_) :: _) =>
|
||||||
|
parseStep(lexPair,(goto(state,nonterm),value)::stack,
|
||||||
|
queue)
|
||||||
|
| _ => raise (ParseImpossible 197))
|
||||||
|
| ERROR => parseStep(fixError args)
|
||||||
|
| ACCEPT =>
|
||||||
|
(case stack
|
||||||
|
of (_,(topvalue,_,_)) :: _ =>
|
||||||
|
let val (token,restLexer) = lexPair
|
||||||
|
in (topvalue,Stream.cons(token,restLexer))
|
||||||
|
end
|
||||||
|
| _ => raise (ParseImpossible 202))
|
||||||
|
end
|
||||||
|
| parseStep _ = raise (ParseImpossible 204)
|
||||||
|
in parseStep
|
||||||
|
end
|
||||||
|
|
||||||
|
(* distanceParse: parse until n tokens are shifted, or accept or
|
||||||
|
error are encountered. Takes a table, showTerminal function, and
|
||||||
|
semantic action function. Returns a parser which takes a lexPair
|
||||||
|
(lex result * lexer), a state stack, a queue, and a distance
|
||||||
|
(must be > 0) to parse. The parser returns a new lex-value, a stack
|
||||||
|
with the nth token shifted on top, a queue, a distance, and action
|
||||||
|
option. *)
|
||||||
|
|
||||||
|
val distanceParse =
|
||||||
|
fn (table,showTerminal,saction,arg) =>
|
||||||
|
let val prAction = prAction showTerminal
|
||||||
|
val action = LrTable.action table
|
||||||
|
val goto = LrTable.goto table
|
||||||
|
fun parseStep(lexPair,stack,queue,0) = (lexPair,stack,queue,0,NONE)
|
||||||
|
| parseStep(lexPair as (TOKEN (terminal, value as (_,leftPos,_)),
|
||||||
|
lexer
|
||||||
|
),
|
||||||
|
stack as (state,_) :: _,
|
||||||
|
queue,distance) =
|
||||||
|
let val nextAction = action(state,terminal)
|
||||||
|
val _ = if DEBUG1 then prAction(stack,lexPair,nextAction)
|
||||||
|
else ()
|
||||||
|
in case nextAction
|
||||||
|
of SHIFT s =>
|
||||||
|
let val newStack = (s,value) :: stack
|
||||||
|
val newLexPair = Stream.get lexer
|
||||||
|
in parseStep(newLexPair,(s,value)::stack,
|
||||||
|
Fifo.put((newStack,newLexPair),queue),distance-1)
|
||||||
|
end
|
||||||
|
| REDUCE i =>
|
||||||
|
(case saction(i,leftPos,stack,arg)
|
||||||
|
of (nonterm,value,stack as (state,_) :: _) =>
|
||||||
|
parseStep(lexPair,(goto(state,nonterm),value)::stack,
|
||||||
|
queue,distance)
|
||||||
|
| _ => raise (ParseImpossible 240))
|
||||||
|
| ERROR => (lexPair,stack,queue,distance,SOME nextAction)
|
||||||
|
| ACCEPT => (lexPair,stack,queue,distance,SOME nextAction)
|
||||||
|
end
|
||||||
|
| parseStep _ = raise (ParseImpossible 242)
|
||||||
|
in parseStep : ('_a,'_b) distanceParse
|
||||||
|
end
|
||||||
|
|
||||||
|
(* mkFixError: function to create fixError function which adjusts parser state
|
||||||
|
so that parse may continue in the presence of an error *)
|
||||||
|
|
||||||
|
fun mkFixError({is_keyword,terms,errtermvalue,
|
||||||
|
preferred_change,noShift,
|
||||||
|
showTerminal,error,...} : ('_a,'_b) ecRecord,
|
||||||
|
distanceParse : ('_a,'_b) distanceParse,
|
||||||
|
minAdvance,maxAdvance)
|
||||||
|
|
||||||
|
(lexv as (TOKEN (term,value as (_,leftPos,_)),_),stack,queue) =
|
||||||
|
let val _ = if DEBUG2 then
|
||||||
|
error("syntax error found at " ^ (showTerminal term),
|
||||||
|
leftPos,leftPos)
|
||||||
|
else ()
|
||||||
|
|
||||||
|
fun tokAt(t,p) = TOKEN(t,(errtermvalue t,p,p))
|
||||||
|
|
||||||
|
val minDelta = 3
|
||||||
|
|
||||||
|
(* pull all the state * lexv elements from the queue *)
|
||||||
|
|
||||||
|
val stateList =
|
||||||
|
let fun f q = let val (elem,newQueue) = Fifo.get q
|
||||||
|
in elem :: (f newQueue)
|
||||||
|
end handle Fifo.Empty => nil
|
||||||
|
in f queue
|
||||||
|
end
|
||||||
|
|
||||||
|
(* now number elements of stateList, giving distance from
|
||||||
|
error token *)
|
||||||
|
|
||||||
|
val (_, numStateList) =
|
||||||
|
List.foldr (fn (a,(num,r)) => (num+1,(a,num)::r)) (0, []) stateList
|
||||||
|
|
||||||
|
(* Represent the set of potential changes as a linked list.
|
||||||
|
|
||||||
|
Values of datatype Change hold information about a potential change.
|
||||||
|
|
||||||
|
oper = oper to be applied
|
||||||
|
pos = the # of the element in stateList that would be altered.
|
||||||
|
distance = the number of tokens beyond the error token which the
|
||||||
|
change allows us to parse.
|
||||||
|
new = new terminal * value pair at that point
|
||||||
|
orig = original terminal * value pair at the point being changed.
|
||||||
|
*)
|
||||||
|
|
||||||
|
datatype ('a,'b) change = CHANGE of
|
||||||
|
{pos : int, distance : int, leftPos: 'b, rightPos: 'b,
|
||||||
|
new : ('a,'b) lexv list, orig : ('a,'b) lexv list}
|
||||||
|
|
||||||
|
|
||||||
|
val showTerms = String.concat o map (fn TOKEN(t,_) => " " ^ showTerminal t)
|
||||||
|
|
||||||
|
val printChange = fn c =>
|
||||||
|
let val CHANGE {distance,new,orig,pos,...} = c
|
||||||
|
in (print ("{distance= " ^ (Int.toString distance));
|
||||||
|
print (",orig ="); print(showTerms orig);
|
||||||
|
print (",new ="); print(showTerms new);
|
||||||
|
print (",pos= " ^ (Int.toString pos));
|
||||||
|
print "}\n")
|
||||||
|
end
|
||||||
|
|
||||||
|
val printChangeList = app printChange
|
||||||
|
|
||||||
|
(* parse: given a lexPair, a stack, and the distance from the error
|
||||||
|
token, return the distance past the error token that we are able to parse.*)
|
||||||
|
|
||||||
|
fun parse (lexPair,stack,queuePos : int) =
|
||||||
|
case distanceParse(lexPair,stack,Fifo.empty,queuePos+maxAdvance+1)
|
||||||
|
of (_,_,_,distance,SOME ACCEPT) =>
|
||||||
|
if maxAdvance-distance-1 >= 0
|
||||||
|
then maxAdvance
|
||||||
|
else maxAdvance-distance-1
|
||||||
|
| (_,_,_,distance,_) => maxAdvance - distance - 1
|
||||||
|
|
||||||
|
(* catList: String.concatenate results of scanning list *)
|
||||||
|
|
||||||
|
fun catList l f = List.foldr (fn(a,r)=> f a @ r) [] l
|
||||||
|
|
||||||
|
fun keywordsDelta new = if List.exists (fn(TOKEN(t,_))=>is_keyword t) new
|
||||||
|
then minDelta else 0
|
||||||
|
|
||||||
|
fun tryChange{lex,stack,pos,leftPos,rightPos,orig,new} =
|
||||||
|
let val lex' = List.foldr (fn (t',p)=>(t',Stream.cons p)) lex new
|
||||||
|
val distance = parse(lex',stack,pos+length new-length orig)
|
||||||
|
in if distance >= minAdvance + keywordsDelta new
|
||||||
|
then [CHANGE{pos=pos,leftPos=leftPos,rightPos=rightPos,
|
||||||
|
distance=distance,orig=orig,new=new}]
|
||||||
|
else []
|
||||||
|
end
|
||||||
|
|
||||||
|
|
||||||
|
(* tryDelete: Try to delete n terminals.
|
||||||
|
Return single-element [success] or nil.
|
||||||
|
Do not delete unshiftable terminals. *)
|
||||||
|
|
||||||
|
|
||||||
|
fun tryDelete n ((stack,lexPair as (TOKEN(term,(_,l,r)),_)),qPos) =
|
||||||
|
let fun del(0,accum,left,right,lexPair) =
|
||||||
|
tryChange{lex=lexPair,stack=stack,
|
||||||
|
pos=qPos,leftPos=left,rightPos=right,
|
||||||
|
orig=rev accum, new=[]}
|
||||||
|
| del(n,accum,left,right,(tok as TOKEN(term,(_,_,r)),lexer)) =
|
||||||
|
if noShift term then []
|
||||||
|
else del(n-1,tok::accum,left,r,Stream.get lexer)
|
||||||
|
in del(n,[],l,r,lexPair)
|
||||||
|
end
|
||||||
|
|
||||||
|
(* tryInsert: try to insert tokens before the current terminal;
|
||||||
|
return a list of the successes *)
|
||||||
|
|
||||||
|
fun tryInsert((stack,lexPair as (TOKEN(_,(_,l,_)),_)),queuePos) =
|
||||||
|
catList terms (fn t =>
|
||||||
|
tryChange{lex=lexPair,stack=stack,
|
||||||
|
pos=queuePos,orig=[],new=[tokAt(t,l)],
|
||||||
|
leftPos=l,rightPos=l})
|
||||||
|
|
||||||
|
(* trySubst: try to substitute tokens for the current terminal;
|
||||||
|
return a list of the successes *)
|
||||||
|
|
||||||
|
fun trySubst ((stack,lexPair as (orig as TOKEN (term,(_,l,r)),lexer)),
|
||||||
|
queuePos) =
|
||||||
|
if noShift term then []
|
||||||
|
else
|
||||||
|
catList terms (fn t =>
|
||||||
|
tryChange{lex=Stream.get lexer,stack=stack,
|
||||||
|
pos=queuePos,
|
||||||
|
leftPos=l,rightPos=r,orig=[orig],
|
||||||
|
new=[tokAt(t,r)]})
|
||||||
|
|
||||||
|
(* do_delete(toks,lexPair) tries to delete tokens "toks" from "lexPair".
|
||||||
|
If it succeeds, returns SOME(toks',l,r,lp), where
|
||||||
|
toks' is the actual tokens (with positions and values) deleted,
|
||||||
|
(l,r) are the (leftmost,rightmost) position of toks',
|
||||||
|
lp is what remains of the stream after deletion
|
||||||
|
*)
|
||||||
|
fun do_delete(nil,lp as (TOKEN(_,(_,l,_)),_)) = SOME(nil,l,l,lp)
|
||||||
|
| do_delete([t],(tok as TOKEN(t',(_,l,r)),lp')) =
|
||||||
|
if eqT (t, t')
|
||||||
|
then SOME([tok],l,r,Stream.get lp')
|
||||||
|
else NONE
|
||||||
|
| do_delete(t::rest,(tok as TOKEN(t',(_,l,r)),lp')) =
|
||||||
|
if eqT (t,t')
|
||||||
|
then case do_delete(rest,Stream.get lp')
|
||||||
|
of SOME(deleted,l',r',lp'') =>
|
||||||
|
SOME(tok::deleted,l,r',lp'')
|
||||||
|
| NONE => NONE
|
||||||
|
else NONE
|
||||||
|
|
||||||
|
fun tryPreferred((stack,lexPair),queuePos) =
|
||||||
|
catList preferred_change (fn (delete,insert) =>
|
||||||
|
if List.exists noShift delete then [] (* should give warning at
|
||||||
|
parser-generation time *)
|
||||||
|
else case do_delete(delete,lexPair)
|
||||||
|
of SOME(deleted,l,r,lp) =>
|
||||||
|
tryChange{lex=lp,stack=stack,pos=queuePos,
|
||||||
|
leftPos=l,rightPos=r,orig=deleted,
|
||||||
|
new=map (fn t=>(tokAt(t,r))) insert}
|
||||||
|
| NONE => [])
|
||||||
|
|
||||||
|
val changes = catList numStateList tryPreferred @
|
||||||
|
catList numStateList tryInsert @
|
||||||
|
catList numStateList trySubst @
|
||||||
|
catList numStateList (tryDelete 1) @
|
||||||
|
catList numStateList (tryDelete 2) @
|
||||||
|
catList numStateList (tryDelete 3)
|
||||||
|
|
||||||
|
val findMaxDist = fn l =>
|
||||||
|
List.foldr (fn (CHANGE {distance,...},high) => Int.max(distance,high)) 0 l
|
||||||
|
|
||||||
|
(* maxDist: max distance past error taken that we could parse *)
|
||||||
|
|
||||||
|
val maxDist = findMaxDist changes
|
||||||
|
|
||||||
|
(* remove changes which did not parse maxDist tokens past the error token *)
|
||||||
|
|
||||||
|
val changes = catList changes
|
||||||
|
(fn(c as CHANGE{distance,...}) =>
|
||||||
|
if distance=maxDist then [c] else [])
|
||||||
|
|
||||||
|
in case changes
|
||||||
|
of (l as change :: _) =>
|
||||||
|
let fun print_msg (CHANGE {new,orig,leftPos,rightPos,...}) =
|
||||||
|
let val s =
|
||||||
|
case (orig,new)
|
||||||
|
of (_::_,[]) => "deleting " ^ (showTerms orig)
|
||||||
|
| ([],_::_) => "inserting " ^ (showTerms new)
|
||||||
|
| _ => "replacing " ^ (showTerms orig) ^
|
||||||
|
" with " ^ (showTerms new)
|
||||||
|
in error ("syntax error: " ^ s,leftPos,rightPos)
|
||||||
|
end
|
||||||
|
|
||||||
|
val _ =
|
||||||
|
(if length l > 1 andalso DEBUG2 then
|
||||||
|
(print "multiple fixes possible; could fix it by:\n";
|
||||||
|
app print_msg l;
|
||||||
|
print "chosen correction:\n")
|
||||||
|
else ();
|
||||||
|
print_msg change)
|
||||||
|
|
||||||
|
(* findNth: find nth queue entry from the error
|
||||||
|
entry. Returns the Nth queue entry and the portion of
|
||||||
|
the queue from the beginning to the nth-1 entry. The
|
||||||
|
error entry is at the end of the queue.
|
||||||
|
|
||||||
|
Examples:
|
||||||
|
|
||||||
|
queue = a b c d e
|
||||||
|
findNth 0 = (e,a b c d)
|
||||||
|
findNth 1 = (d,a b c)
|
||||||
|
*)
|
||||||
|
|
||||||
|
val findNth = fn n =>
|
||||||
|
let fun f (h::t,0) = (h,rev t)
|
||||||
|
| f (h::t,n) = f(t,n-1)
|
||||||
|
| f (nil,_) = let exception FindNth
|
||||||
|
in raise FindNth
|
||||||
|
end
|
||||||
|
in f (rev stateList,n)
|
||||||
|
end
|
||||||
|
|
||||||
|
val CHANGE {pos,orig,new,...} = change
|
||||||
|
val (last,queueFront) = findNth pos
|
||||||
|
val (stack,lexPair) = last
|
||||||
|
|
||||||
|
val lp1 = List.foldl(fn (_,(_,r)) => Stream.get r) lexPair orig
|
||||||
|
val lp2 = List.foldr(fn(t,r)=>(t,Stream.cons r)) lp1 new
|
||||||
|
|
||||||
|
val restQueue =
|
||||||
|
Fifo.put((stack,lp2),
|
||||||
|
List.foldl Fifo.put Fifo.empty queueFront)
|
||||||
|
|
||||||
|
val (lexPair,stack,queue,_,_) =
|
||||||
|
distanceParse(lp2,stack,restQueue,pos)
|
||||||
|
|
||||||
|
in (lexPair,stack,queue)
|
||||||
|
end
|
||||||
|
| nil => (error("syntax error found at " ^ (showTerminal term),
|
||||||
|
leftPos,leftPos); raise ParseError)
|
||||||
|
end
|
||||||
|
|
||||||
|
val parse = fn {arg,table,lexer,saction,void,lookahead,
|
||||||
|
ec=ec as {showTerminal,...} : ('_a,'_b) ecRecord} =>
|
||||||
|
let val distance = 15 (* defer distance tokens *)
|
||||||
|
val minAdvance = 1 (* must parse at least 1 token past error *)
|
||||||
|
val maxAdvance = Int.max(lookahead,0)(* max distance for parse check *)
|
||||||
|
val lexPair = Stream.get lexer
|
||||||
|
val (TOKEN (_,(_,leftPos,_)),_) = lexPair
|
||||||
|
val startStack = [(initialState table,(void,leftPos,leftPos))]
|
||||||
|
val startQueue = Fifo.put((startStack,lexPair),Fifo.empty)
|
||||||
|
val distanceParse = distanceParse(table,showTerminal,saction,arg)
|
||||||
|
val fixError = mkFixError(ec,distanceParse,minAdvance,maxAdvance)
|
||||||
|
val ssParse = ssParse(table,showTerminal,saction,fixError,arg)
|
||||||
|
fun loop (lexPair,stack,queue,_,SOME ACCEPT) =
|
||||||
|
ssParse(lexPair,stack,queue)
|
||||||
|
| loop (lexPair,stack,queue,0,_) = ssParse(lexPair,stack,queue)
|
||||||
|
| loop (lexPair,stack,queue,distance,SOME ERROR) =
|
||||||
|
let val (lexPair,stack,queue) = fixError(lexPair,stack,queue)
|
||||||
|
in loop (distanceParse(lexPair,stack,queue,distance))
|
||||||
|
end
|
||||||
|
| loop _ = let exception ParseInternal
|
||||||
|
in raise ParseInternal
|
||||||
|
end
|
||||||
|
in loop (distanceParse(lexPair,startStack,startQueue,distance))
|
||||||
|
end
|
||||||
|
end;
|
||||||
|
|
|
@ -0,0 +1,29 @@
|
||||||
|
(******************************************************************************
|
||||||
|
* STANDARD ML OF NEW JERSEY COPYRIGHT NOTICE, LICENSE AND DISCLAIMER.
|
||||||
|
*
|
||||||
|
* Copyright (c) 1989-2002 by Lucent Technologies
|
||||||
|
*
|
||||||
|
* Permission to use, copy, modify, and distribute this software and its
|
||||||
|
* documentation for any purpose and without fee is hereby granted,
|
||||||
|
* provided that the above copyright notice appear in all copies and that
|
||||||
|
* both the copyright notice and this permission notice and warranty
|
||||||
|
* disclaimer appear in supporting documentation, and that the name of
|
||||||
|
* Lucent Technologies, Bell Labs or any Lucent entity not be used in
|
||||||
|
* advertising or publicity pertaining to distribution of the software
|
||||||
|
* without specific, written prior permission.
|
||||||
|
*
|
||||||
|
* Lucent disclaims all warranties with regard to this software,
|
||||||
|
* including all implied warranties of merchantability and fitness. In no
|
||||||
|
* event shall Lucent be liable for any special, indirect or
|
||||||
|
* consequential damages or any damages whatsoever resulting from loss of
|
||||||
|
* use, data or profits, whether in an action of contract, negligence or
|
||||||
|
* other tortious action, arising out of or in connection with the use
|
||||||
|
* or performance of this software.
|
||||||
|
******************************************************************************)
|
||||||
|
(* $Id$ *)
|
||||||
|
|
||||||
|
use "base.sig";
|
||||||
|
use "join.sml";
|
||||||
|
use "lrtable.sml";
|
||||||
|
use "stream.sml";
|
||||||
|
use "parser2.sml";
|
|
@ -0,0 +1,43 @@
|
||||||
|
(******************************************************************************
|
||||||
|
* STANDARD ML OF NEW JERSEY COPYRIGHT NOTICE, LICENSE AND DISCLAIMER.
|
||||||
|
*
|
||||||
|
* Copyright (c) 1989-2002 by Lucent Technologies
|
||||||
|
*
|
||||||
|
* Permission to use, copy, modify, and distribute this software and its
|
||||||
|
* documentation for any purpose and without fee is hereby granted,
|
||||||
|
* provided that the above copyright notice appear in all copies and that
|
||||||
|
* both the copyright notice and this permission notice and warranty
|
||||||
|
* disclaimer appear in supporting documentation, and that the name of
|
||||||
|
* Lucent Technologies, Bell Labs or any Lucent entity not be used in
|
||||||
|
* advertising or publicity pertaining to distribution of the software
|
||||||
|
* without specific, written prior permission.
|
||||||
|
*
|
||||||
|
* Lucent disclaims all warranties with regard to this software,
|
||||||
|
* including all implied warranties of merchantability and fitness. In no
|
||||||
|
* event shall Lucent be liable for any special, indirect or
|
||||||
|
* consequential damages or any damages whatsoever resulting from loss of
|
||||||
|
* use, data or profits, whether in an action of contract, negligence or
|
||||||
|
* other tortious action, arising out of or in connection with the use
|
||||||
|
* or performance of this software.
|
||||||
|
******************************************************************************)
|
||||||
|
(* $Id$ *)
|
||||||
|
|
||||||
|
(* ML-Yacc Parser Generator (c) 1989 Andrew W. Appel, David R. Tarditi *)
|
||||||
|
|
||||||
|
(* Stream: a structure implementing a lazy stream. The signature STREAM
|
||||||
|
is found in base.sig *)
|
||||||
|
|
||||||
|
structure Stream :> STREAM =
|
||||||
|
struct
|
||||||
|
datatype 'a str = EVAL of 'a * 'a str Unsynchronized.ref | UNEVAL of (unit->'a)
|
||||||
|
|
||||||
|
type 'a stream = 'a str Unsynchronized.ref
|
||||||
|
|
||||||
|
fun get(Unsynchronized.ref(EVAL t)) = t
|
||||||
|
| get(s as Unsynchronized.ref(UNEVAL f)) =
|
||||||
|
let val t = (f(), Unsynchronized.ref(UNEVAL f)) in s := EVAL t; t end
|
||||||
|
|
||||||
|
fun streamify f = Unsynchronized.ref(UNEVAL f)
|
||||||
|
fun cons(a,s) = Unsynchronized.ref(EVAL(a,s))
|
||||||
|
|
||||||
|
end;
|
|
@ -0,0 +1,102 @@
|
||||||
|
(***********************************************************************************
|
||||||
|
* Copyright (c) 2005-2021 Achim D. Brucker
|
||||||
|
*
|
||||||
|
* All rights reserved.
|
||||||
|
*
|
||||||
|
* Redistribution and use in source and binary forms, with or without
|
||||||
|
* modification, are permitted provided that the following conditions are met:
|
||||||
|
*
|
||||||
|
* * Redistributions of source code must retain the above copyright notice, this
|
||||||
|
*
|
||||||
|
* * Redistributions in binary form must reproduce the above copyright notice,
|
||||||
|
* this list of conditions and the following disclaimer in the documentation
|
||||||
|
* and/or other materials provided with the distribution.
|
||||||
|
*
|
||||||
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
||||||
|
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
||||||
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
||||||
|
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
|
||||||
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
||||||
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
||||||
|
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
|
||||||
|
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
|
||||||
|
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
||||||
|
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
||||||
|
*
|
||||||
|
* SPDX-License-Identifier: BSD-2-Clause
|
||||||
|
* Repository: https://git.logicalhacking.com/adbrucker/isabelle-hacks/
|
||||||
|
* Dependencies: None
|
||||||
|
***********************************************************************************)
|
||||||
|
|
||||||
|
(***********************************************************************************
|
||||||
|
|
||||||
|
# Changelog
|
||||||
|
|
||||||
|
This comment documents all notable changes to this file in a format inspired by
|
||||||
|
[Keep a Changelog](https://keepachangelog.com/en/1.0.0/), and this project adheres
|
||||||
|
to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
|
||||||
|
|
||||||
|
## [Unreleased]
|
||||||
|
|
||||||
|
## [1.0.0] - 2021-04-29
|
||||||
|
- Initial release as part of "Isabelle Hacks".
|
||||||
|
|
||||||
|
***********************************************************************************)
|
||||||
|
|
||||||
|
chapter\<open>ML Yacc Library for Isabelle\<close>
|
||||||
|
theory
|
||||||
|
"ml_yacc_lib"
|
||||||
|
imports
|
||||||
|
Main
|
||||||
|
begin
|
||||||
|
ML_file "ml-yacc-lib/base.sig"
|
||||||
|
ML_file "ml-yacc-lib/join.sml"
|
||||||
|
ML_file "ml-yacc-lib/lrtable.sml"
|
||||||
|
ML_file "ml-yacc-lib/stream.sml"
|
||||||
|
ML_file "ml-yacc-lib/parser2.sml"
|
||||||
|
|
||||||
|
(*
|
||||||
|
|
||||||
|
The files in the directory "ml-yacc-lib" are part of the sml/NJ language
|
||||||
|
processing tools. It was modified to work with Isabelle/ML by Achim D. Brucker.
|
||||||
|
|
||||||
|
It was downloaded from http://smlnj.cs.uchicago.edu/dist/working
|
||||||
|
|
||||||
|
Upstream Authors: The SML/NJ Team <smlnj-dev-list@lists.sourceforge.net>
|
||||||
|
|
||||||
|
Copyright: 2003-2008 The SML/NJ Fellowship
|
||||||
|
1989-2002 Lucent Technologies
|
||||||
|
1991-2003 John Reppy
|
||||||
|
1996-1998,2000 YALE FLINT PROJECT
|
||||||
|
1992 Vrije Universiteit, The Netherlands
|
||||||
|
1989-1992 Andrew W. Appel, James S. Mattson, David R. Tarditi
|
||||||
|
1988 Evans & Sutherland Computer Corporation, Salt Lake City, Utah
|
||||||
|
|
||||||
|
STANDARD ML OF NEW JERSEY COPYRIGHT NOTICE, LICENSE AND DISCLAIMER.
|
||||||
|
|
||||||
|
Copyright (c) 1989-2002 by Lucent Technologies
|
||||||
|
|
||||||
|
Permission to use, copy, modify, and distribute this software and its
|
||||||
|
documentation for any purpose and without fee is hereby granted,
|
||||||
|
provided that the above copyright notice appear in all copies and that
|
||||||
|
both the copyright notice and this permission notice and warranty
|
||||||
|
disclaimer appear in supporting documentation, and that the name of
|
||||||
|
Lucent Technologies, Bell Labs or any Lucent entity not be used in
|
||||||
|
advertising or publicity pertaining to distribution of the software
|
||||||
|
without specific, written prior permission.
|
||||||
|
|
||||||
|
Lucent disclaims all warranties with regard to this software,
|
||||||
|
including all implied warranties of merchantability and fitness. In no
|
||||||
|
event shall Lucent be liable for any special, indirect or
|
||||||
|
consequential damages or any damages whatsoever resulting from loss of
|
||||||
|
use, data or profits, whether in an action of contract, negligence or
|
||||||
|
other tortious action, arising out of or in connection with the use
|
||||||
|
or performance of this software.
|
||||||
|
|
||||||
|
|
||||||
|
The SML/NJ distribution also includes code licensed under the same
|
||||||
|
terms as above, but with "David R. Tarditi Jr. and Andrew W. Appel",
|
||||||
|
"Vrije Universiteit" or "Evans & Sutherland" instead of "Lucent".
|
||||||
|
|
||||||
|
*)
|
||||||
|
end
|
Loading…
Reference in New Issue