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(* Title: HOL/TPTP/TPTP_Parser/tptp_parser.ML
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Author: Nik Sultana, Cambridge University Computer Laboratory
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An interface for a parser, generated using ML-Yacc, to parse TPTP languages.
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*)
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(* Build the parser structure *)
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structure TPTPLrVals = TPTPLrValsFun(structure Token = LrParser.Token)
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structure TPTPLex = TPTPLexFun(structure Tokens = TPTPLrVals.Tokens)
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structure TPTPParser
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= JoinWithArg
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(structure ParserData = TPTPLrVals.ParserData
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structure Lex = TPTPLex
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structure LrParser = LrParser)
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(* Parser interface *)
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structure TPTP_Parser :
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sig
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val parse_file : string -> TPTP_Syntax.tptp_problem
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val parse_expression : string -> string -> TPTP_Syntax.tptp_problem
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exception TPTP_PARSE_ERROR
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end =
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struct
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exception TPTP_PARSE_ERROR
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val LOOKAHEAD = 0 (*usually set to 15*)
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local
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fun print_error file_name (msg, line, col) =
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error (file_name ^ "[" ^ Int.toString line ^ ":" ^ Int.toString col ^ "] " ^
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msg ^ "\n")
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fun parse lookahead grab file_name =
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TPTPParser.parse
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(lookahead,
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TPTPParser.makeLexer grab file_name,
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print_error file_name,
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file_name)
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in
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fun parse_expression file_name expression =
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(*file_name only used in reporting error messages*)
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let
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val currentPos = Unsynchronized.ref 0
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fun grab n =
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if !currentPos = String.size expression then ""
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else
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let
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fun extractStr n =
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let
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val s = String.extract (expression, !currentPos, SOME n)
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in
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currentPos := !currentPos + n;
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s
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end
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val remaining = String.size expression - !currentPos
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in if remaining < n then extractStr remaining else extractStr n
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end
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val (tree, _ (*remainder*)) =
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parse LOOKAHEAD grab file_name
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in tree end
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fun parse_file' lookahead file_name =
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parse_expression
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file_name
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(File.open_input TextIO.inputAll (Path.explode file_name))
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end
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val parse_file = parse_file' LOOKAHEAD
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end
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