/*
 * tclCompExpr.c --
 *
 *	This file contains the code to parse and compile Tcl expressions
 *	and implementations of the Tcl commands corresponding to expression
 *	operators, such as the command ::tcl::mathop::+ .
 *
 * Contributions from Don Porter, NIST, 2006-2007. (not subject to US copyright)
 *
 * 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 1.90 2007/12/13 15:23:15 dgp Exp $
 */

#include "tclInt.h"
#include "tclCompile.h"		/* CompileEnv */

/*
 * Expression parsing takes place in the routine ParseExpr().  It takes a

    Tcl_Obj *const *litObjv = objv + 1;

    if (objc != 1+occdPtr->i.numArgs) {
	Tcl_WrongNumArgs(interp, 1, objv, occdPtr->expected);
	return TCL_ERROR;
    }

    ParseLexeme(occdPtr->operator, strlen(occdPtr->operator), &lexeme, NULL);
    nodes[0].lexeme = START;
    nodes[0].mark = MARK_RIGHT;
    nodes[0].right = 1;
    nodes[1].lexeme = lexeme;
    if (objc == 2) {
	nodes[1].mark = MARK_RIGHT;
    } else {

		2*(objc-2)*sizeof(Tcl_Obj *));
	OpNode *nodes = (OpNode *) TclStackAlloc(interp,
		2*(objc-2)*sizeof(OpNode));
	unsigned char lexeme;
	int i, lastAnd = 1;
	Tcl_Obj *const *litObjPtrPtr = litObjv;

	ParseLexeme(occdPtr->operator, strlen(occdPtr->operator),
		&lexeme, NULL);

	litObjv[0] = objv[1];
	nodes[0].lexeme = START;
	nodes[0].mark = MARK_RIGHT;
	for (i=2; i<objc-1; i++) {
	    litObjv[2*(i-1)-1] = objv[i];
	    nodes[2*(i-1)-1].lexeme = lexeme;

    int code;

    if (objc < 2) {
	Tcl_SetObjResult(interp, Tcl_NewIntObj(occdPtr->i.identity));
	return TCL_OK;
    }

    ParseLexeme(occdPtr->operator, strlen(occdPtr->operator), &lexeme, NULL);
    lexeme |= BINARY;

    if (objc == 2) {
	Tcl_Obj *litObjv[2];
	OpNode nodes[2];
	int decrMe = 0;
	Tcl_Obj *const *litObjPtrPtr = litObjv;