Re: another symbol-printing fix

[prj@po.cwru.edu (Paul Jarc)]

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I wrote:
> 	* print.c (scm_print_symbol_name): Handle #{`foo}#, #{,foo}#,
> 	and #{.}# specially.
>
> This is still not complete, though.  There are still problem cases
> like #{0.0}#, #{-i}#, etc.

This patch handles those numeric cases.  It incorporates and overrides
my earlier patch.  After this, there are no remaining buggy cases to
solve, AFAIK: any symbol, no matter how strange, should be able to be
written and re-read, resulting in the same symbol.

	* print.c (scm_print_symbol_name): Handle #{`foo}#, #{,foo}#,
	#{.}#, and all numeric strings specially.


paul

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Index: guile-core/libguile/print.c
===================================================================
RCS file: /cvsroot/guile/guile/guile-core/libguile/print.c,v
retrieving revision 1.157
diff -u -r1.157 print.c
--- guile-core/libguile/print.c	30 Nov 2003 00:57:14 -0000	1.157
+++ guile-core/libguile/print.c	5 Jan 2004 18:46:45 -0000
@@ -39,6 +39,7 @@
 #include "libguile/strports.h"
 #include "libguile/vectors.h"
 #include "libguile/lang.h"
+#include "libguile/numbers.h"
 
 #include "libguile/validate.h"
 #include "libguile/print.h"
@@ -315,16 +316,16 @@
    * weird because of other characters, backslahes need to be escaped too.
    * The first time we see a backslash, we set maybe_weird, and mw_pos points
    * to the backslash.  Then if the name turns out to be weird, we re-process
-   * everything starting from mw_pos. */
+   * everything starting from mw_pos.
+   * We could instead make backslashes always weird.  This is not necessary
+   * to ensure that the output is (read)-able, but it would make this code
+   * simpler and faster. */
   int maybe_weird = 0;
   size_t mw_pos = 0;
-  /* If the name is purely numeric, then it's weird as a whole, even though
-   * none of the individual characters is weird.  But we won't know this
-   * until we reach the end of the name.  This flag describes the part of the
-   * name we've looked at so far. */
-  int all_digits = 1;
 
-  if (len == 0 || str[0] == '\'' || str[0] == ':' || str[len-1] == ':')
+  if (len == 0 || str[0] == '\'' || str[0] == '`' || str[0] == ',' ||
+      str[0] == ':' || str[len-1] == ':' || (str[0] == '.' && len == 1) ||
+      !SCM_FALSEP (scm_i_mem2number(str, len, 10)))
     {
       scm_lfwrite ("#{", 2, port);
       weird = 1;
@@ -344,7 +345,6 @@
       case '#':
       case SCM_WHITE_SPACES:
       case SCM_LINE_INCREMENTORS:
-	all_digits = 0;
       weird_handler:
 	if (maybe_weird)
 	  {
@@ -367,7 +367,6 @@
 	pos = end + 1;
 	break;
       case '\\':
-	all_digits = 0;
 	if (weird)
 	  goto weird_handler;
 	if (!maybe_weird)
@@ -376,18 +375,9 @@
 	    mw_pos = pos;
 	  }
 	break;
-      case '0': case '1': case '2': case '3': case '4':
-      case '5': case '6': case '7': case '8': case '9':
-	break;
       default:
-	all_digits = 0;
 	break;
       }
-  if (all_digits)
-    {
-      scm_lfwrite ("#{", 2, port);
-      weird = 1;
-    }
   if (pos < end)
     scm_lfwrite (str + pos, end - pos, port);
   if (weird)

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