bug#24378: [PATCH 3/6] Replace decimalnump with alphanumericp

[Michal Nazarewicz <mina86@mina86.com>]

decimalnump was used in regex.c only in ISALNUM macro which ored it with
alphabeticp.  Because both of those functions require Unicode general
category lookup, this resulted in unnecessary lookups (if alphabeticp
return false decimalp had to perform another lookup).  Drop decimalnump
in favour of alphanumericp which combines decimelnump with alphabeticp.

* src/character.c (decimalnump): Remove in favour of…
(alphanumericp): …new function.

* src/regex.c (ISALNUM): Use alphanumericp.
---
 src/character.c | 17 +++++++++++++----
 src/character.h |  2 +-
 src/regex.c     |  2 +-
 3 files changed, 15 insertions(+), 6 deletions(-)

diff --git a/src/character.c b/src/character.c
index 9f60aa7..b19e41d 100644
--- a/src/character.c
+++ b/src/character.c
@@ -983,17 +983,26 @@ alphabeticp (int c)
 	  || gen_cat == UNICODE_CATEGORY_Nl);
 }
 
-/* Return true if C is a decimal-number character.  */
+/* Return true if C is a alphabetic or decimal-number character.  */
 bool
-decimalnump (int c)
+alphanumericp (int c)
 {
   Lisp_Object category = CHAR_TABLE_REF (Vunicode_category_table, c);
   if (! INTEGERP (category))
     return false;
   EMACS_INT gen_cat = XINT (category);
 
-  /* See UTS #18.  */
-  return gen_cat == UNICODE_CATEGORY_Nd;
+  /* See UTS #18.  Same comment as for alphabeticp applies.  FIXME. */
+  return (gen_cat == UNICODE_CATEGORY_Lu
+	  || gen_cat == UNICODE_CATEGORY_Ll
+	  || gen_cat == UNICODE_CATEGORY_Lt
+	  || gen_cat == UNICODE_CATEGORY_Lm
+	  || gen_cat == UNICODE_CATEGORY_Lo
+	  || gen_cat == UNICODE_CATEGORY_Mn
+	  || gen_cat == UNICODE_CATEGORY_Mc
+	  || gen_cat == UNICODE_CATEGORY_Me
+	  || gen_cat == UNICODE_CATEGORY_Nl
+	  || gen_cat == UNICODE_CATEGORY_Nd);
 }
 
 /* Return true if C is a graphic character.  */
diff --git a/src/character.h b/src/character.h
index 0d0e31c..5499cc1 100644
--- a/src/character.h
+++ b/src/character.h
@@ -679,7 +679,7 @@ extern Lisp_Object Vchar_unify_table;
 extern Lisp_Object string_escape_byte8 (Lisp_Object);
 
 extern bool alphabeticp (int);
-extern bool decimalnump (int);
+extern bool alphanumericp (int);
 extern bool graphicp (int);
 extern bool printablep (int);
 
diff --git a/src/regex.c b/src/regex.c
index c808398..5f51b43 100644
--- a/src/regex.c
+++ b/src/regex.c
@@ -324,7 +324,7 @@ enum syntaxcode { Swhitespace = 0, Sword = 1, Ssymbol = 2 };
 		    ? (((c) >= 'a' && (c) <= 'z')	\
 		       || ((c) >= 'A' && (c) <= 'Z')	\
 		       || ((c) >= '0' && (c) <= '9'))	\
-		    : (alphabeticp (c) || decimalnump (c)))
+		    : alphanumericp (c))
 
 # define ISALPHA(c) (IS_REAL_ASCII (c)			\
 		    ? (((c) >= 'a' && (c) <= 'z')	\
-- 
2.8.0.rc3.226.g39d4020