Stack.php

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<?php
class PHPExcel_Calculation_Token_Stack {

        private $_stack = array();

        private $_count = 0;


        public function count() {
                return $this->_count;
        }       //      function count()

        public function push($type, $value, $reference = NULL) {
                $this->_stack[$this->_count++] = array('type'           => $type,
                                                                                           'value'              => $value,
                                                                                           'reference'  => $reference
                                                                                          );
                if ($type == 'Function') {
                        $localeFunction = PHPExcel_Calculation::_localeFunc($value);
                        if ($localeFunction != $value) {
                                $this->_stack[($this->_count - 1)]['localeValue'] = $localeFunction;
                        }
                }
        }       //      function push()

        public function pop() {
                if ($this->_count > 0) {
                        return $this->_stack[--$this->_count];
                }
                return NULL;
        }       //      function pop()

        public function last($n = 1) {
                if ($this->_count - $n < 0) {
                        return NULL;
                }
                return $this->_stack[$this->_count - $n];
        }       //      function last()

        function clear() {
                $this->_stack = array();
                $this->_count = 0;
        }

}       //      class PHPExcel_Calculation_Token_Stack