IMPLEMENTATION MODULE MiscFunctions;

(*
 *  ModBase
 *  Release 3.0
 *  By Don Fletcher & John McMonagle
 *  (c) Copyright 1986 - 1991 PMI
 *  P.O. Box 8402
 *  Green Bay Wi 53308
 *  All Rights Reserved
 *
 *)

IMPORT StrEdit;

  CONST
    Tab = 11C;
    EOL = 36C;
 TYPE
   CHARSET =SET OF CHAR;

  PROCEDURE Trim(VAR str : ARRAY OF CHAR);
    (* Strips trailing blanks from a string *)
    BEGIN
      StrEdit.CutTrailingChars(' ',str);
    END Trim;

  PROCEDURE Upper(VAR str : ARRAY OF CHAR);
    BEGIN
      StrEdit.CAPstr(str);
    END Upper;

  PROCEDURE Alph(c : CHAR) : BOOLEAN;
    BEGIN
      RETURN c IN CHARSET{'A'..'Z','a'..'z'};
    END Alph;

  PROCEDURE Digit(c : CHAR) : BOOLEAN;
    BEGIN
      RETURN c IN CHARSET{'0'..'9'};
    END Digit;

  PROCEDURE AlphaNum(c : CHAR) : BOOLEAN;
    BEGIN
      RETURN (Alph(c)) OR (Digit(c));
    END AlphaNum;

  PROCEDURE Punc(c : CHAR) : BOOLEAN;
    BEGIN
      RETURN (NOT AlphaNum(c)) AND (c>=' ');
    END Punc;

  PROCEDURE Printable(c : CHAR) : BOOLEAN;
    BEGIN
      RETURN c IN CHARSET{' '..'~'};
    END Printable;

  PROCEDURE IsLower(c : CHAR) : BOOLEAN;
    BEGIN
      RETURN c IN CHARSET{'a'..'z'};
    END IsLower;

  PROCEDURE IsUpper(c : CHAR) : BOOLEAN;
    BEGIN
      RETURN c IN CHARSET{'A'..'Z'};
    END IsUpper;

  PROCEDURE IsSpace(c : CHAR) : BOOLEAN;
    BEGIN
      RETURN c IN CHARSET{' ',EOL,12C,15C,Tab};
    END IsSpace;

  PROCEDURE FieldName(str : ARRAY OF CHAR) : BOOLEAN;
    VAR
      legal : BOOLEAN;
      i : CARDINAL;
    BEGIN
      Trim(str);
      i := 0;
      WHILE (i<HIGH(str)) AND (str[i]#0C) DO
        INC(i);
      END;
      IF (i>0) AND (str[i]=0C) THEN
        DEC(i);
      END;
      legal := (i<10) AND (Alph(str[0]));
      WHILE (i>0) AND legal DO
        legal := FieldNameChar(str[i]);
        DEC(i);
      END;
      RETURN legal;
    END FieldName;

  PROCEDURE FieldNameChar(c : CHAR) : BOOLEAN;
    BEGIN
      RETURN (AlphaNum(c)) OR (c='_');
    END FieldNameChar;

  END MiscFunctions.