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Annotation of 43BSDReno/share/doc/ps1/15.yacc/ssd, revision 1.1.1.1

1.1       root        1: .\"    @(#)ssd 6.1 (Berkeley) 5/8/86
                      2: .\"
                      3: .SH
                      4: Appendix D: Old Features Supported but not Encouraged
                      5: .PP
                      6: This Appendix mentions synonyms and features which are supported for historical
                      7: continuity, but, for various reasons, are not encouraged.
                      8: .IP 1.
                      9: Literals may also be delimited by double quotes ``"''.
                     10: .IP 2.
                     11: Literals may be more than one character long.
                     12: If all the characters are alphabetic, numeric, or \_, the type number of the literal is defined,
                     13: just as if the literal did not have the quotes around it.
                     14: Otherwise, it is difficult to find the value for such literals.
                     15: .IP
                     16: The use of multi-character literals is likely to mislead those unfamiliar with
                     17: Yacc, since it suggests that Yacc is doing a job which must be actually done by the lexical analyzer.
                     18: .IP 3.
                     19: Most places where % is legal, backslash ``\e'' may be used.
                     20: In particular, \e\e is the same as %%, \eleft the same as %left, etc.
                     21: .IP 4.
                     22: There are a number of other synonyms:
                     23: .DS
                     24: %< is the same as %left
                     25: %> is the same as %right
                     26: %binary and %2 are the same as %nonassoc
                     27: %0 and %term are the same as %token
                     28: %= is the same as %prec
                     29: .DE
                     30: .IP 5.
                     31: Actions may also have the form
                     32: .DS
                     33: ={ . . . }
                     34: .DE
                     35: and the curly braces can be dropped if the action is a
                     36: single C statement.
                     37: .IP 6.
                     38: C code between %{ and %} used to be permitted at the
                     39: head of the rules section, as well as in the
                     40: declaration section.

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