124 lines
2.3 KiB
PHP
124 lines
2.3 KiB
PHP
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<?php
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/**
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* PHP Command Line Tools
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*
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* This source file is subject to the MIT license that is bundled
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* with this package in the file LICENSE.
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*
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* @author James Logsdon <dwarf@girsbrain.org>
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* @copyright 2010 James Logsdom (http://girsbrain.org)
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* @license http://www.opensource.org/licenses/mit-license.php The MIT License
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*/
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namespace cli\arguments;
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use cli\Memoize;
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class Lexer extends Memoize implements \Iterator {
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private $_items = array();
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private $_index = 0;
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private $_length = 0;
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private $_first = true;
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/**
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* @param array $items A list of strings to process as tokens.
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*/
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public function __construct(array $items) {
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$this->_items = $items;
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$this->_length = count($items);
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}
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/**
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* The current token.
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*
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* @return string
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*/
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public function current() {
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return $this->_item;
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}
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/**
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* Peek ahead to the next token without moving the cursor.
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*
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* @return Argument
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*/
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public function peek() {
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return new Argument($this->_items[0]);
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}
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/**
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* Move the cursor forward 1 element if it is valid.
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*/
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public function next() {
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if ($this->valid()) {
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$this->_shift();
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}
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}
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/**
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* Return the current position of the cursor.
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*
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* @return int
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*/
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public function key() {
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return $this->_index;
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}
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/**
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* Move forward 1 element and, if the method hasn't been called before, reset
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* the cursor's position to 0.
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*/
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public function rewind() {
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$this->_shift();
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if ($this->_first) {
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$this->_index = 0;
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$this->_first = false;
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}
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}
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/**
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* Returns true if the cursor has not reached the end of the list.
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*
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* @return bool
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*/
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public function valid() {
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return ($this->_index < $this->_length);
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}
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/**
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* Push an element to the front of the stack.
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*
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* @param mixed $item The value to set
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*/
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public function unshift($item) {
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array_unshift($this->_items, $item);
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$this->_length += 1;
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}
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/**
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* Returns true if the cursor is at the end of the list.
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*
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* @return bool
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*/
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public function end() {
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return ($this->_index + 1) == $this->_length;
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}
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private function _shift() {
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$this->_item = new Argument(array_shift($this->_items));
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$this->_index += 1;
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$this->_explode();
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$this->_unmemo('peek');
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}
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private function _explode() {
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if (!$this->_item->canExplode) {
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return false;
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}
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foreach ($this->_item->exploded as $piece) {
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$this->unshift('-' . $piece);
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}
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}
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}
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