150 lines
3.2 KiB
PHP
150 lines
3.2 KiB
PHP
<?php
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namespace PhpOffice\PhpSpreadsheet\Calculation\Token;
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use PhpOffice\PhpSpreadsheet\Calculation\Calculation;
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class Stack
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{
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/**
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* The parser stack for formulae.
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*
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* @var mixed[]
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*/
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private $stack = [];
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/**
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* Count of entries in the parser stack.
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*
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* @var int
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*/
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private $count = 0;
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/**
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* Return the number of entries on the stack.
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*
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* @return int
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*/
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public function count()
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{
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return $this->count;
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}
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/**
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* Push a new entry onto the stack.
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*
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* @param mixed $type
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* @param mixed $value
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* @param mixed $reference
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* @param null|string $storeKey will store the result under this alias
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* @param null|string $onlyIf will only run computation if the matching
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* store key is true
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* @param null|string $onlyIfNot will only run computation if the matching
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* store key is false
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*/
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public function push(
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$type,
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$value,
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$reference = null,
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$storeKey = null,
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$onlyIf = null,
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$onlyIfNot = null
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): void {
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$stackItem = $this->getStackItem($type, $value, $reference, $storeKey, $onlyIf, $onlyIfNot);
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$this->stack[$this->count++] = $stackItem;
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if ($type == 'Function') {
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$localeFunction = Calculation::localeFunc($value);
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if ($localeFunction != $value) {
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$this->stack[($this->count - 1)]['localeValue'] = $localeFunction;
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}
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}
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}
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public function getStackItem(
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$type,
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$value,
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$reference = null,
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$storeKey = null,
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$onlyIf = null,
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$onlyIfNot = null
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) {
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$stackItem = [
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'type' => $type,
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'value' => $value,
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'reference' => $reference,
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];
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if (isset($storeKey)) {
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$stackItem['storeKey'] = $storeKey;
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}
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if (isset($onlyIf)) {
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$stackItem['onlyIf'] = $onlyIf;
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}
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if (isset($onlyIfNot)) {
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$stackItem['onlyIfNot'] = $onlyIfNot;
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}
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return $stackItem;
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}
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/**
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* Pop the last entry from the stack.
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*
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* @return mixed
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*/
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public function pop()
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{
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if ($this->count > 0) {
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return $this->stack[--$this->count];
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}
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return null;
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}
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/**
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* Return an entry from the stack without removing it.
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*
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* @param int $n number indicating how far back in the stack we want to look
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*
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* @return mixed
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*/
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public function last($n = 1)
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{
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if ($this->count - $n < 0) {
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return null;
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}
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return $this->stack[$this->count - $n];
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}
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/**
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* Clear the stack.
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*/
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public function clear(): void
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{
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$this->stack = [];
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$this->count = 0;
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}
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public function __toString()
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{
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$str = 'Stack: ';
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foreach ($this->stack as $index => $item) {
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if ($index > $this->count - 1) {
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break;
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}
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$value = $item['value'] ?? 'no value';
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while (is_array($value)) {
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$value = array_pop($value);
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}
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$str .= $value . ' |> ';
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}
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return $str;
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}
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}
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