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authordgp <dgp@users.sourceforge.net>2007-08-28 17:43:03 (GMT)
committerdgp <dgp@users.sourceforge.net>2007-08-28 17:43:03 (GMT)
commit7e86582642385bcca3dc26abaf937f7973c71428 (patch)
tree291270d477ff5b6ba2177a964206dbea76ecbde7 /generic
parent7ea40c818db9bc2997da24992b2a40ef4a84d49a (diff)
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* generic/tclCompExpr.c: Use a table lookup in ParseLexeme()
to determine lexemes with single-byte representations.
Diffstat (limited to 'generic')
-rw-r--r--generic/tclCompExpr.c118
1 files changed, 55 insertions, 63 deletions
diff --git a/generic/tclCompExpr.c b/generic/tclCompExpr.c
index 96ff49c..18ac99d 100644
--- a/generic/tclCompExpr.c
+++ b/generic/tclCompExpr.c
@@ -10,7 +10,7 @@
* See the file "license.terms" for information on usage and redistribution of
* this file, and for a DISCLAIMER OF ALL WARRANTIES.
*
- * RCS: @(#) $Id: tclCompExpr.c,v 1.85 2007/08/28 16:24:29 dgp Exp $
+ * RCS: @(#) $Id: tclCompExpr.c,v 1.86 2007/08/28 17:43:07 dgp Exp $
*/
#include "tclInt.h"
@@ -436,6 +436,54 @@ static const unsigned char instruction[] = {
};
/*
+ * A table mapping a byte value to the corresponding lexeme for use by
+ * ParseLexeme().
+ */
+
+static unsigned char Lexeme[] = {
+ INVALID /* NUL */, INVALID /* SOH */,
+ INVALID /* STX */, INVALID /* ETX */,
+ INVALID /* EOT */, INVALID /* ENQ */,
+ INVALID /* ACK */, INVALID /* BEL */,
+ INVALID /* BS */, INVALID /* HT */,
+ INVALID /* LF */, INVALID /* VT */,
+ INVALID /* FF */, INVALID /* CR */,
+ INVALID /* SO */, INVALID /* SI */,
+ INVALID /* DLE */, INVALID /* DC1 */,
+ INVALID /* DC2 */, INVALID /* DC3 */,
+ INVALID /* DC4 */, INVALID /* NAK */,
+ INVALID /* SYN */, INVALID /* ETB */,
+ INVALID /* CAN */, INVALID /* EM */,
+ INVALID /* SUB */, INVALID /* ESC */,
+ INVALID /* FS */, INVALID /* GS */,
+ INVALID /* RS */, INVALID /* US */,
+ INVALID /* SPACE */, 0 /* ! or != */,
+ QUOTED /* " */, INVALID /* # */,
+ VARIABLE /* $ */, MOD /* % */,
+ 0 /* & or && */, INVALID /* ' */,
+ OPEN_PAREN /* ( */, CLOSE_PAREN /* ) */,
+ 0 /* * or ** */, PLUS /* + */,
+ COMMA /* , */, MINUS /* - */,
+ 0 /* . */, DIVIDE /* / */,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0-9 */
+ COLON /* : */, INVALID /* ; */,
+ 0 /* < or << or <= */,
+ 0 /* == or INVALID */,
+ 0 /* > or >> or >= */,
+ QUESTION /* ? */, INVALID /* @ */,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* A-M */
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* N-Z */
+ SCRIPT /* [ */, INVALID /* \ */,
+ INVALID /* ] */, BIT_XOR /* ^ */,
+ INVALID /* _ */, INVALID /* ` */,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* a-m */
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* n-z */
+ BRACED /* { */, 0 /* | or || */,
+ INVALID /* } */, BIT_NOT /* ~ */,
+ INVALID /* DEL */
+};
+
+/*
* The JumpList struct is used to create a stack of data needed for the
* TclEmitForwardJump() and TclFixupForwardJump() calls that are performed
* when compiling the short-circuiting operators QUESTION/COLON, AND, and OR.
@@ -1775,74 +1823,18 @@ ParseLexeme(
int scanned;
Tcl_UniChar ch;
Tcl_Obj *literal = NULL;
-
-/* TODO: Consider table lookup */
+ unsigned char byte;
if (numBytes == 0) {
*lexemePtr = END;
return 0;
}
- switch (*start) {
- case '[':
- *lexemePtr = SCRIPT;
- return 1;
-
- case '{':
- *lexemePtr = BRACED;
- return 1;
-
- case '(':
- *lexemePtr = OPEN_PAREN;
- return 1;
-
- case ')':
- *lexemePtr = CLOSE_PAREN;
- return 1;
-
- case '$':
- *lexemePtr = VARIABLE;
- return 1;
-
- case '\"':
- *lexemePtr = QUOTED;
- return 1;
-
- case ',':
- *lexemePtr = COMMA;
+ byte = (unsigned char)(*start);
+ if (byte < sizeof(Lexeme) && Lexeme[byte] != 0) {
+ *lexemePtr = Lexeme[byte];
return 1;
-
- case '/':
- *lexemePtr = DIVIDE;
- return 1;
-
- case '%':
- *lexemePtr = MOD;
- return 1;
-
- case '+':
- *lexemePtr = PLUS;
- return 1;
-
- case '-':
- *lexemePtr = MINUS;
- return 1;
-
- case '?':
- *lexemePtr = QUESTION;
- return 1;
-
- case ':':
- *lexemePtr = COLON;
- return 1;
-
- case '^':
- *lexemePtr = BIT_XOR;
- return 1;
-
- case '~':
- *lexemePtr = BIT_NOT;
- return 1;
-
+ }
+ switch (byte) {
case '*':
if ((numBytes > 1) && (start[1] == '*')) {
*lexemePtr = EXPON;