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Annotation of src/usr.bin/yacc/NEW_FEATURES, Revision 1.1.1.1

1.1       deraadt     1:      The -r option has been implemented.  The -r option tells Yacc to
                      2: put the read-only tables in y.tab.c and the code and variables in
                      3: y.code.c.  Keith Bostic asked for this option so that :yyfix could be
                      4: eliminated.
                      5:
                      6:      The -l and -t options have been implemented.  The -l option tells
                      7: Yacc not to include #line directives in the code it produces.  The -t
                      8: option causes debugging code to be included in the compiled parser.
                      9:
                     10:      The code for error recovery has been changed to implement the same
                     11: algorithm as AT&T Yacc.  There will still be differences in the way
                     12: error recovery works because AT&T Yacc uses more default reductions
                     13: than Berkeley Yacc.
                     14:
                     15:      The environment variable TMPDIR determines the directory where
                     16: temporary files will be created.  If TMPDIR is defined, temporary files
                     17: will be created in the directory whose pathname is the value of TMPDIR.
                     18: By default, temporary files are created in /tmp.
                     19:
                     20:      The keywords are now case-insensitive.  For example, %nonassoc,
                     21: %NONASSOC, %NonAssoc, and %nOnAsSoC are all equivalent.
                     22:
                     23:      Commas and semicolons that are not part of C code are treated as
                     24: commentary.
                     25:
                     26:      Line-end comments, as in BCPL, are permitted.  Line-end comments
                     27: begin with // and end at the next end-of-line.  Line-end comments are
                     28: permitted in C code; they are converted to C comments on output.
                     29:
                     30:      The form of y.output files has been changed to look more like
                     31: those produced by AT&T Yacc.
                     32:
                     33:      A new kind of declaration has been added.  The form of the declaration
                     34: is
                     35:
                     36:          %ident string
                     37:
                     38: where string is a sequence of characters begining with a double quote
                     39: and ending with either a double quote or the next end-of-line, whichever
                     40: comes first.  The declaration will cause a #ident directive to be written
                     41: near the start of the output file.
                     42:
                     43:      If a parser has been compiled with debugging code, that code can be
                     44: enabled by setting an environment variable.  If the environment variable
                     45: YYDEBUG is set to 0, debugging output is suppressed.  If it is set to 1,
                     46: debugging output is written to standard output.