[brlcad-commits] SF.net SVN: brlcad:[47553] brlcad/trunk/doc/bison_to_lemon.txt

[<n_...@us...>]

Revision: 47553
          http://brlcad.svn.sourceforge.net/brlcad/?rev=47553&view=rev
Author:   n_reed
Date:     2011-11-18 17:24:52 +0000 (Fri, 18 Nov 2011)
Log Message:
-----------
update on alias substitution

Modified Paths:
--------------
    brlcad/trunk/doc/bison_to_lemon.txt

Modified: brlcad/trunk/doc/bison_to_lemon.txt
===================================================================
--- brlcad/trunk/doc/bison_to_lemon.txt	2011-11-18 17:22:43 UTC (rev 47552)
+++ brlcad/trunk/doc/bison_to_lemon.txt	2011-11-18 17:24:52 UTC (rev 47553)
@@ -163,6 +163,15 @@
 
 WARNING: Converting from bison to lemon syntax is tedious and error-prone.
 
+WARNING: Lemon does a global replacement of the alias within the action.
+         The following doesn't work, because the 's' in "%s" will get
+         substituted as well:
+
+    text ::= STRING(s). {
+	/* will print something like "%yympsp[0].minor.yy0>>Shift 7" */
+	printf("%s", s.string);
+    }
+
  Lemon Makes All Terminals the Same Type
 -----------------------------------------
 In Bison, you typically create a union that specifies the possible types of tokens, and then you declare the types for individual tokens:

This was sent by the SourceForge.net collaborative development platform, the world's largest Open Source development site.