Return to NEW_FEATURES CVS log

Up to [CSRG BSD Unix] / 43BSDReno / pgrm / yacc

Annotation of 43BSDReno/pgrm/yacc/NEW_FEATURES, revision 1.1.1.1

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.

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.