基础代码

vendor/wp-cli/php-cli-tools/lib/cli/arguments/Lexer.php

@@ -0,0 +1,123 @@
+<?php
+/**
+ * PHP Command Line Tools
+ *
+ * This source file is subject to the MIT license that is bundled
+ * with this package in the file LICENSE.
+ *
+ * @author    James Logsdon <dwarf@girsbrain.org>
+ * @copyright 2010 James Logsdom (http://girsbrain.org)
+ * @license   http://www.opensource.org/licenses/mit-license.php The MIT License
+ */
+
+namespace cli\arguments;
+
+use cli\Memoize;
+
+class Lexer extends Memoize implements \Iterator {
+	private $_items = array();
+	private $_index = 0;
+	private $_length = 0;
+	private $_first = true;
+
+	/**
+	 * @param array  $items  A list of strings to process as tokens.
+	 */
+	public function __construct(array $items) {
+		$this->_items = $items;
+		$this->_length = count($items);
+	}
+
+	/**
+	 * The current token.
+	 *
+	 * @return string
+	 */
+	public function current() {
+		return $this->_item;
+	}
+
+	/**
+	 * Peek ahead to the next token without moving the cursor.
+	 *
+	 * @return Argument
+	 */
+	public function peek() {
+		return new Argument($this->_items[0]);
+	}
+
+	/**
+	 * Move the cursor forward 1 element if it is valid.
+	 */
+	public function next() {
+		if ($this->valid()) {
+			$this->_shift();
+		}
+	}
+
+	/**
+	 * Return the current position of the cursor.
+	 *
+	 * @return int
+	 */
+	public function key() {
+		return $this->_index;
+	}
+
+	/**
+	 * Move forward 1 element and, if the method hasn't been called before, reset
+	 * the cursor's position to 0.
+	 */
+	public function rewind() {
+		$this->_shift();
+		if ($this->_first) {
+			$this->_index = 0;
+			$this->_first = false;
+		}
+	}
+
+	/**
+	 * Returns true if the cursor has not reached the end of the list.
+	 *
+	 * @return bool
+	 */
+	public function valid() {
+		return ($this->_index < $this->_length);
+	}
+
+	/**
+	 * Push an element to the front of the stack.
+	 *
+	 * @param mixed  $item  The value to set
+	 */
+	public function unshift($item) {
+		array_unshift($this->_items, $item);
+		$this->_length += 1;
+	}
+
+	/**
+	 * Returns true if the cursor is at the end of the list.
+	 *
+	 * @return bool
+	 */
+	public function end() {
+		return ($this->_index + 1) == $this->_length;
+	}
+
+	private function _shift() {
+		$this->_item = new Argument(array_shift($this->_items));
+		$this->_index += 1;
+		$this->_explode();
+		$this->_unmemo('peek');
+	}
+
+	private function _explode() {
+		if (!$this->_item->canExplode) {
+			return false;
+		}
+
+		foreach ($this->_item->exploded as $piece) {
+			$this->unshift('-' . $piece);
+		}
+	}
+}