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v1.33
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3 Commits

Author SHA1 Message Date
Akim Demaille
d39a6b7ca9 Instead of mapping the LHS of unused rules to -1, keep the LHS 
valid, but flag the rules as invalid.
* src/gram.h (rule_t): `useful' is a new member.
* src/print.c (print_grammar): Adjust.
* src/derives.c (set_derives): Likewise.
* src/reader.c (packgram, reduce_output): Likewise.
* src/reduce.c (reduce_grammar_tables): Likewise.
* tests/reduce.at (Underivable Rules, Useless Rules): New.
 2001-11-30 10:46:08 +00:00
Akim Demaille
ea451a17d7 * src/reduce.c (nonterminals_reduce): Instead of throwing away 
useless nonterminals, move them at the end of the symbol arrays.
(reduce_output): Adjust.
* tests/reduce.at (Useless Nonterminals): Adjust.
 2001-11-30 10:45:28 +00:00
Akim Demaille
0aa2ac9063 * tests/reduce.at (Useless Terminals, Useless Nonterminals): New. 
* src/reduce.c (reduce_grammar_tables): Do not free useless tags,
as all tags are free'ed afterwards.
From Enrico Scholz.
 2001-11-28 11:42:56 +00:00