From ff8a6cce170ecb6c523b6c59a865946f402226b5 Mon Sep 17 00:00:00 2001
From: Kaz Kylheku <kaz@kylheku.com>
Date: Tue, 20 Mar 2012 23:07:10 -0700
Subject: Regression fix: 1..3 scans incorrectly into 1. .3 tokens.

* parser.l (SGN, EXP, DIG): New regex definitions.
(FLO): Do not recognize numbers of the form 123.
Decimal point must be followed either by exponent, or digits
(which may then be followed by an exponent).
(FLODOT): New token type, recognizes 123.
(grammar): Recognize FLODOT as a floating point number,
only if it not trailed by another dot, and
recognize FLO unconditionally.
---
 parser.l | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

(limited to 'parser.l')

diff --git a/parser.l b/parser.l
index d8fd9150..449cc148 100644
--- a/parser.l
+++ b/parser.l
@@ -149,8 +149,12 @@ static wchar_t num_esc(char *num)
 %option noinput
 
 SYM     [a-zA-Z0-9_]+
-NUM     [+\-]?[0-9]+
-FLO     [+\-]?([0-9]+[.]?[0-9]*|[0-9]*[.][0-9]+)([eE][+-]?[0-9]+)?
+SGN     [+\-]
+EXP     [eE][+\-]?[0-9]+
+DIG     [0-9]
+NUM     {SGN}?{DIG}+
+FLO     {SGN}?{DIG}*[.]({DIG}+{EXP}?|{EXP})
+FLODOT  {SGN}?{DIG}+[.]
 BSCHR   [a-zA-Z0-9!$%&*+\-<=>?\\^_~]
 BSYM    {BSCHR}({BSCHR}|#)*
 NSCHR   [a-zA-Z0-9!$%&*+\-<=>?\\^_~/]
@@ -190,7 +194,8 @@ UONLY   {U2}{U}|{U3}{U}{U}|{U4}{U}{U}{U}
   return NUMBER;
 }
 
-<SPECIAL,NESTED,BRACED>{FLO} {
+<SPECIAL,NESTED,BRACED>{FLODOT}/[^.] |
+<SPECIAL,NESTED,BRACED>{FLO}         {
   val str = string_own(utf8_dup_from(yytext));
 
   if (yy_top_state() == INITIAL
-- 
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