Re: Syntax change: REAL requires at least one digit before decimal point (issue 6446048)

[dak]

Reviewers: Keith,

Message:
On 2012/07/26 02:37:19, Keith wrote:
> Oh, I don't know.  It's only mildly annoying, but I don't see what
good it does.
>   What else could ".3" be besides a number ?

A chord step.  But chordmode is pretty awful anyway.  I agree that
syntactically 4. is quite the more important case (and it is rather
pointless since 4\cm works quite fine)

> <http://www.mutopiaproject.org/cgibin/piece-info.cgi?id=921>

> chp-28-04-a4.ly:45:18: error: syntax error, unexpected '.'
>    bottom-margin =
>                    .6\cm               % A4

That is the sort of thing that a long-term syntax guarantee should not
cover.  Unnecessarily illegible for both human and computer.

Description:
Syntax change: REAL requires at least one digit before decimal point

Please review this at http://codereview.appspot.com/6446048/

Affected files:
  M lily/lexer.ll


Index: lily/lexer.ll
diff --git a/lily/lexer.ll b/lily/lexer.ll
index  
07bb33c6f7187979356d7e6ffac05cca3ba095a5..30a1b5fa4b1732af5e79a654e5671e296b858ff3  
100644
--- a/lily/lexer.ll
+++ b/lily/lexer.ll
@@ -166,7 +166,7 @@ UNSIGNED    {N}+
 E_UNSIGNED     \\{N}+
 FRACTION       {N}+\/{N}+
 INT            -?{UNSIGNED}
-REAL           ({INT}\.{N}*)|(-?\.{N}+)
+REAL           {INT}\.{N}*
 WHITE          [ \n\t\f\r]
 HORIZONTALWHITE                [ \t]
 BLACK          [^ \n\t\f\r]
@@ -528,10 +528,6 @@ BOM_UTF8   \357\273\277
                yylval.scm =  scan_fraction (YYText ());
                return FRACTION;
        }
-       {UNSIGNED}/\/[^0-9] { // backup rule
-               yylval.scm = scm_c_read_string (YYText ());
-               return UNSIGNED;
-       }
        {UNSIGNED}/\/   | // backup rule
        {UNSIGNED}              {
                yylval.scm = scm_c_read_string (YYText ());
@@ -573,10 +569,6 @@ BOM_UTF8   \357\273\277
                yylval.scm =  scan_fraction (YYText ());
                return FRACTION;
        }
-       {UNSIGNED}/\/[^0-9] { // backup rule
-               yylval.scm = scm_c_read_string (YYText ());
-               return UNSIGNED;
-       }
        {UNSIGNED}/\/   | // backup rule
        {UNSIGNED}              {
                yylval.scm = scm_c_read_string (YYText ());
@@ -720,10 +712,6 @@ BOM_UTF8   \357\273\277
        yylval.scm = scm_c_read_string (YYText ());
        return REAL;
 }
--\.    { // backup rule
-       yylval.scm = scm_from_double (0.0);
-       return REAL;
-}

 {UNSIGNED}/\/  | // backup rule
 {UNSIGNED}     {