[Pspp-cvs] Changes to pspp/src/ChangeLog

[Ben Pfaff]

Index: pspp/src/ChangeLog
diff -u pspp/src/ChangeLog:1.148 pspp/src/ChangeLog:1.149
--- pspp/src/ChangeLog:1.148    Thu Mar  3 14:21:00 2005
+++ pspp/src/ChangeLog  Mon Mar  7 03:04:50 2005
@@ -1,3 +1,30 @@
+Sun Mar  6 17:07:20 2005  Ben Pfaff  <address@hidden>
+
+       When the lexer sees something like `-5' in the input, it has to
+       decide whether it's a negative numeric constant token or a '-'
+       token followed by a positive numeric constant token.  It always
+       decides on the former, and then the parser can call
+       lex_negative_to_dash() if it wants the latter.  However, this
+       doesn't work for the case of `-0', because negative zero is
+       (portably) indistinguishable from positive zero.  So now we divide
+       T_NUM into two tokens, T_POS_NUM and T_NEG_NUM, to make the
+       distinction clear.  This requires a little bit of extra effort,
+       because there were several references to T_NUM in the code base.
+       
+       * lexer.c: (lex_get) Use T_NEG_NUM and T_POS_NUM to distinguish
+       positive and negative numeric constants.
+       (lex_double_p) Renamed lex_is_number().  Changed return type to
+       bool.  Updated all relevant references to T_NUM to instead use
+       this function.
+       (lex_double) Renamed lex_number().  All references updated.
+       (lex_integer_p) Renamed lex_is_integer().  Changed return type to
+       bool.  All references updated.
+       (lex_token_representation) Understand T_NEG_NUM and T_POS_NUM.
+       (lex_negative_to_dash) Ditto.
+       (dump_token) Ditto.
+       
+       * lexer.h: (enum) Add T_POS_NUM, T_NEG_NUM.  Remove T_NUM.
+
 Thu Mar  3 22:08:35 WST 2005 John Darrington <address@hidden>
 
        * Makefile.am : Fixed up CLEANFILES target.