summaryrefslogtreecommitdiff
path: root/devel/bison2/pkg-descr
diff options
context:
space:
mode:
Diffstat (limited to 'devel/bison2/pkg-descr')
-rw-r--r--devel/bison2/pkg-descr22
1 files changed, 0 insertions, 22 deletions
diff --git a/devel/bison2/pkg-descr b/devel/bison2/pkg-descr
deleted file mode 100644
index c968b052baf7..000000000000
--- a/devel/bison2/pkg-descr
+++ /dev/null
@@ -1,22 +0,0 @@
-Bison is a tool used to write parsers, such as the parser for GNU cc.
-It is similar to Yacc, which is included in the base FreeBSD system.
-
-The main difference between Bison and Yacc that I know of is that
-Bison supports the @N construction, which gives you access to
-the starting and ending line number and character number associated
-with any of the symbols in the current rule.
-
-Also, Bison supports the command `%expect N' which says not to mention
-the conflicts if there are N shift/reduce conflicts and no reduce/reduce
-conflicts.
-
-The differences in the algorithms stem mainly from the horrible
-kludges that Johnson had to perpetrate to make Yacc fit in a PDP-11.
-
-Also, Bison uses a faster but less space-efficient encoding for the
-parse tables (see Corbett's PhD thesis from Berkeley, "Static
-Semantics in Compiler Error Recovery", June 1985, Report No. UCB/CSD
-85/251), and more modern technique for generating the lookahead sets.
-(See "Efficient Construction of LALR(1) Lookahead Sets" by F. DeRemer
-and A. Pennello, in ACM TOPLS Vol 4 No 4, October 1982. Their
-technique is the standard one now.)