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Annotation of 43BSDReno/pgrm/yacc/NEW_FEATURES, revision 1.1

1.1     ! root        1:      This version of Berkeley Yacc has been extensively reorganized and
        !             2: contains many new features.  It is an amalgam of three earlier versions
        !             3: of Berkeley Yacc.  It is largely untested, so expect it to contain bugs.
        !             4: When bugs are found report them to [email protected].  Please
        !             5: include small examples if possible.
        !             6: 
        !             7:      Despite my pleas not to be told of undocumented features of AT&T Yacc,
        !             8: I have received unsolicited descriptions of such features.  Telling me of
        !             9: such features places the public-domain status of Berkeley Yacc at risk.
        !            10: Please do not send me descriptions of undocumented features.  On the
        !            11: other hand, I would be very interested in learning of documented
        !            12: features I have not implemented.
        !            13: 
        !            14:      The -l and -t options have been implemented.  The -l option tells
        !            15: Yacc not to include #line directives in the code it produces.  The -t
        !            16: option causes debugging code to be included in the compiled parser.
        !            17: 
        !            18:      The code for error recovery has been changed to implement the same
        !            19: algorithm as AT&T Yacc.  There will still be differences in the way
        !            20: error recovery works because AT&T Yacc uses more default reductions
        !            21: than Berekeley Yacc.
        !            22: 
        !            23:      The environment variable TMPDIR determines the directory where
        !            24: temporary files will be created.  If TMPDIR is defined, temporary files
        !            25: will be created in the directory whose pathname is the value of TMPDIR.
        !            26: By default, temporary files are created in /tmp.
        !            27: 
        !            28:      The keywords are now case-insensitive.  For example, %nonassoc,
        !            29: %NONASSOC, %NonAssoc, and %nOnAsSoC are all equivalent.
        !            30: 
        !            31:      Commas and semicolons that are not part of C code are treated as
        !            32: commentary.
        !            33: 
        !            34:      Line-end comments, as in BCPL, are permitted.  Line-end comments
        !            35: begin with // and end at the next end-of-line.  Line-end comments are
        !            36: permitted in C code; they are converted to C comments on output.
        !            37: 
        !            38:      The form of y.output files has been changed to look more like
        !            39: those produced by AT&T Yacc.
        !            40: 
        !            41:      A new kind of declaration has been added.  The form of the declaration
        !            42: is
        !            43: 
        !            44:          %ident string
        !            45: 
        !            46: where string is a sequence of characters begining with a double quote
        !            47: and ending with either a double quote or the next end-of-line, whichever
        !            48: comes first.  The declaration will cause a #ident directive to be written
        !            49: near the start of the output file.
        !            50: 
        !            51:      If a parser has been compiled with debugging code, that code can be
        !            52: enabled by setting an environment variable.  If the environment variable
        !            53: YYDEBUG is set to 0, debugging output is suppressed.  If it is set to 1,
        !            54: debugging output is written to standard output.

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