shithub: libmujs

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Optimize isalpha/digit macros in lexer.

--- a/jslex.c

+++ b/jslex.c

@@ -117,24 +117,28 @@

 	return c == 0xA || c == 0xD || c == 0x2028 || c == 0x2029;

 }

+#define isalpha(c) ((((unsigned)(c)|32)-'a') < 26)

+#define isdigit(c) (((unsigned)(c)-'0') < 10)

+#define ishex(c) ((((unsigned)(c)|32)-'a') < 6)

+

 static int jsY_isidentifierstart(int c)

 {

-	return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || c == '$' || c == '_' || isalpharune(c);

+	return isalpha(c) || c == '$' || c == '_' || isalpharune(c);

 }

 static int jsY_isidentifierpart(int c)

 {

-	return (c >= '0' && c <= '9') || jsY_isidentifierstart(c);

+	return isdigit(c) || isalpha(c) || c == '$' || c == '_' || isalpharune(c);

 }

 static int jsY_isdec(int c)

 {

-	return (c >= '0' && c <= '9');

+	return isdigit(c);

 }

 int jsY_ishex(int c)

 {

-	return (c >= '0' && c <= '9') || (c >= 'a' && c <= 'f') || (c >= 'A' && c <= 'F');

+	return isdigit(c) || ishex(c);

 }

 int jsY_tohex(int c)