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authordgp <dgp@users.sourceforge.net>2006-08-16 17:56:29 (GMT)
committerdgp <dgp@users.sourceforge.net>2006-08-16 17:56:29 (GMT)
commitc441dca49ce8195d79b0d6abf058ca5a75015ee6 (patch)
tree21b0ad8154dc3e5d0f211444b6b8044c90705b7e /generic
parentef64babb61a918650674c395526ecc89ba85c709 (diff)
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* generic/tclParseExpr.c: Replace PrecedenceOf() function
with prec[] static array.
Diffstat (limited to 'generic')
-rw-r--r--generic/tclParseExpr.c90
1 files changed, 14 insertions, 76 deletions
diff --git a/generic/tclParseExpr.c b/generic/tclParseExpr.c
index 4453f2b..dc277b6 100644
--- a/generic/tclParseExpr.c
+++ b/generic/tclParseExpr.c
@@ -12,7 +12,7 @@
* See the file "license.terms" for information on usage and redistribution of
* this file, and for a DISCLAIMER OF ALL WARRANTIES.
*
- * RCS: @(#) $Id: tclParseExpr.c,v 1.35 2006/07/20 06:17:39 das Exp $
+ * RCS: @(#) $Id: tclParseExpr.c,v 1.36 2006/08/16 17:56:30 dgp Exp $
*/
#define OLD_EXPR_PARSER 0
@@ -1981,7 +1981,6 @@ LogSyntaxError(
typedef struct ExprNode {
unsigned char lexeme; /* Code that identifies the type of this node */
- unsigned char precedence; /* Precedence for operator nodes */
int left; /* Index of the left operand of this operator node */
int right; /* Index of the right operand of this operator node */
int parent; /* Index of the operator of this operand node */
@@ -2058,7 +2057,6 @@ static void GenerateTokens(ExprNode *nodes, Tcl_Parse *scratchPtr,
Tcl_Parse *parsePtr);
static int ParseLexeme(CONST char *start, int numBytes,
unsigned char *lexemePtr);
-static unsigned char PrecedenceOf(unsigned char operand);
/*
@@ -2108,6 +2106,13 @@ Tcl_ParseExpr(
unsigned char precedence;
CONST char *space, *operand, *end;
int scanned = 0, size, limit = 25, code = TCL_OK;
+ static unsigned char prec[80] = {
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 15, 15, 5, 16, 16, 16, 13, 13, 11, 10, 9, 6, 6, 14, 14,
+ 13, 13, 12, 12, 8, 7, 12, 12, 17, 12, 12, 3, 1, 0, 0, 0,
+ 0, 18, 18, 18, 2, 4, 18, 18, 0, 0, 0, 0, 0, 0, 0, 0,
+ };
if (numBytes < 0) {
numBytes = (start ? strlen(start) : 0);
@@ -2119,7 +2124,6 @@ Tcl_ParseExpr(
/* Initialize the parse tree with the special "START" node */
nodes->lexeme = START;
- nodes->precedence = PrecedenceOf(START);
nodes->left = -1;
nodes->right = -1;
nodes->parent = -1;
@@ -2379,7 +2383,6 @@ Tcl_ParseExpr(
nodePtr->left = -1;
nodePtr->right = -1;
- nodePtr->precedence = 0;
nodePtr->parent = -1;
lastOrphanPtr = nodePtr;
nodesUsed++;
@@ -2404,7 +2407,6 @@ Tcl_ParseExpr(
code = TCL_ERROR;
continue;
}
- nodePtr->precedence = PrecedenceOf(nodePtr->lexeme);
nodePtr->left = -1;
nodePtr->right = -1;
nodePtr->parent = -1;
@@ -2434,7 +2436,6 @@ Tcl_ParseExpr(
* case accept it as an argument list for a function */
scanned = 0;
nodePtr->lexeme = EMPTY;
- nodePtr->precedence = 0;
nodePtr->left = -1;
nodePtr->right = -1;
nodePtr->parent = -1;
@@ -2450,11 +2451,11 @@ Tcl_ParseExpr(
continue;
}
- precedence = PrecedenceOf(nodePtr->lexeme);
+ precedence = prec[nodePtr->lexeme];
if ((NODE_TYPE & lastNodePtr->lexeme) != LEAF) {
msg = Tcl_NewObj();
- if (lastNodePtr->precedence > precedence) {
+ if (prec[lastNodePtr->lexeme] > precedence) {
if (lastNodePtr->lexeme == OPEN_PAREN) {
lastOrphanPtr = lastNodePtr;
msg = Tcl_NewStringObj("unbalanced open paren", -1);
@@ -2496,12 +2497,12 @@ Tcl_ParseExpr(
}
otherPtr--;
- if (otherPtr->precedence < precedence) {
+ if (prec[otherPtr->lexeme] < precedence) {
break;
}
/* Special association rules for the ternary operators */
- if (otherPtr->precedence == precedence) {
+ if (prec[otherPtr->lexeme] == precedence) {
if ((otherPtr->lexeme == QUESTION)
&& (lastOrphanPtr->lexeme != COLON)) {
break;
@@ -2585,7 +2586,6 @@ Tcl_ParseExpr(
}
/* Link orphan as left operand of new node */
- nodePtr->precedence = PrecedenceOf(nodePtr->lexeme);
nodePtr->right = -1;
nodePtr->parent = -1;
@@ -2634,13 +2634,13 @@ Tcl_ParseExpr(
subexpr = scratch.tokenPtr[lastOrphanPtr->token].start;
lastOrphanPtr--;
} else {
- precedence = lastOrphanPtr->precedence;
+ precedence = prec[lastOrphanPtr->lexeme];
while (lastOrphanPtr->left >= 0) {
lastOrphanPtr = nodes + lastOrphanPtr->left;
}
subexpr = scratch.tokenPtr[lastOrphanPtr->token].start;
lastOrphanPtr--;
- if (lastOrphanPtr->precedence >= precedence) {
+ if (prec[lastOrphanPtr->lexeme] >= precedence) {
continue;
}
}
@@ -2821,68 +2821,6 @@ GenerateTokens(
/*
*----------------------------------------------------------------------
*
- * PrecedenceOf --
- *
- * Utility routine that returns the precedence level of an operator.
- *
- * Results:
- * Returns an unsigned char value. Greater value indicates greater
- * operator precedence.
- *
- *----------------------------------------------------------------------
- */
-
-static unsigned char
-PrecedenceOf(
- unsigned char operator)
-{
- switch (operator) {
- case NOT: case BIT_NOT: case UNARY_PLUS: case UNARY_MINUS:
- case FUNCTION:
- return 18;
- case EXPON:
- return 17;
- case MULT: case DIVIDE: case MOD:
- return 16;
- case BINARY_PLUS: case BINARY_MINUS:
- return 15;
- case LEFT_SHIFT: case RIGHT_SHIFT:
- return 14;
- case LESS: case LEQ: case GREATER: case GEQ:
- return 13;
- case EQUAL: case NEQ: case IN_LIST: case NOT_IN_LIST:
- case STREQ: case STRNEQ:
- return 12;
- case BIT_AND:
- return 11;
- case BIT_XOR:
- return 10;
- case BIT_OR:
- return 9;
- case AND:
- return 8;
- case OR:
- return 7;
- case COLON: case QUESTION:
- return 6;
- case COMMA:
- return 5;
- case OPEN_PAREN:
- return 4;
- case CLOSE_PAREN:
- return 3;
- case START:
- return 2;
- case END:
- return 1;
- }
- /* NOT REACHED */
- return 0;
-}
-
-/*
- *----------------------------------------------------------------------
- *
* ParseLexeme --
*
* Parse a single lexeme from the start of a string, scanning no