diff options
Diffstat (limited to 'generic/tclParseExpr.c')
| -rw-r--r-- | generic/tclParseExpr.c | 90 |
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 |