Consolidate the 4 prologue alternative directives (%code, %requires,

[bison.git] / ChangeLog

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+2007-01-04  Joel E. Denny  <jdenny@ces.clemson.edu>
+
+       Consolidate the 4 prologue alternative directives (%code, %requires,
+       %provides, and %code-top) into a single %code directive with an
+       optional qualifier field.  Discussed at
+       <http://lists.gnu.org/archive/html/bison-patches/2007-01/msg00012.html>.
+       * NEWS (2.3a+): Rewrite the existing entry for the prologue
+       alternatives.
+       * doc/bison.texinfo (Prologue Alternatives): Update.
+       (Decl Summary): Update to %code "requires" and %code "provides".
+       (Calc++ Parser): Update to %code "requires".
+       (Bison Symbols): Remove entries for %requires, %provides, and
+       %code-top.  Rewrite %code entry, and add a %code "QUALIFIER" entry.
+       * data/bison.m4 (b4_user_provides, b4_user_requires): Remove as these
+       are replaced by b4_percent_code_provides and b4_percent_code_requires,
+       which are skeleton-specific.
+       (b4_check_percent_code_qualifiers): New.  A skeleton can use this to
+       declare what %code qualifiers it supports and to complain if any other
+       qualifiers were used in the grammar.
+       * data/glr.cc: Update to use b4_user_code([b4_percent_code_requires])
+       and b4_user_code([b4_percent_code_provides]) in place of
+       b4_user_requires and b4_user_provides.
+       * data/glr.c, data/lalr1.cc, data/push.c, data/yacc.c: Likewise.
+       Add b4_user_code([b4_percent_code_top]) and
+       b4_user_code([b4_percent_code]).
+       Invoke b4_check_percent_code_qualifiers.
+       * src/parse-gram.y (PERCENT_CODE_TOP, PERCENT_PROVIDES,
+       PERCENT_REQUIRES): Remove.
+       (grammar_declaration): Remove RHS's for %code-top, %provides, and
+       %requires.  Rewrite the %code RHS as the unqualified form defining the
+       muscle b4_percent_code.  Add another RHS for the qualified %code form,
+       which defines muscles of the form b4_percent_code_QUALIFIER and the
+       b4_used_percent_code_qualifiers muscle.
+       * src/scan-gram.l (PERCENT_CODE_TOP, PERCENT_PROVIDES,
+       PERCENT_REQUIRES): Remove.
+       * tests/actions.at (_AT_CHECK_PRINTER_AND_DESTRUCTOR): Update to use
+       %code "requires" and %code "provides".
+       * tests/input.at (Reject bad %code qualifiers): New.
+
 2007-01-03  Joel E. Denny  <jdenny@ces.clemson.edu>
 
        Use the new code_props interface for destructors and printers.