<?php/* @description     Transformation Style Sheets - Revolutionising PHP templating    * * @author          Tom Butler tom@r.je                                             * * @copyright       2017 Tom Butler <tom@r.je> | https://r.je/                      * * @license         http://www.opensource.org/licenses/bsd-license.php  BSD License * * @version         1.2                                                             */namespace Transphporm\Parser;class Tokens implements \Iterator, \Countable {	private $tokens = [];	private $iterator = 0;	public function __construct($tokens = []) {		$this->tokens = $tokens;	}	public function count() {		return count($this->tokens);	}	// Iterator Functions	public function current() {		return $this->tokens[$this->iterator];	}	public function key() {		return $this->iterator;	}	public function next() {		++$this->iterator;	}	public function valid() {		return isset($this->tokens[$this->iterator]);	}	public function rewind() {		$this->iterator = 0;	}	public function add($token) {		if ($token instanceof Tokens) $this->tokens = array_merge($this->tokens,  $token->tokens);		else $this->tokens[] = $token;	}	public function end() {		return end($this->tokens);	}	private function getKeysOfTokenType($tokenType) {		return array_keys(array_column($this->tokens, 'type'), $tokenType);	}	private function getKeyToSlice($tokenType) {		$keys = $this->getKeysOfTokenType($tokenType);		if (empty($keys)) return false;		$key = $keys[0];		for ($i = 0; $key < $this->iterator && isset($keys[$i]); $i++) $key = $keys[$i];		return $key;	}	public function from($tokenType, $inclusive = false) {		return $this->sliceTokens($tokenType, "from", !$inclusive);	}	public function to($tokenType, $inclusive = false) {		return $this->sliceTokens($tokenType, "to", $inclusive);	}	private function sliceTokens($tokenType, $type, $increment = false) {		$key = $this->getKeyToSlice($tokenType);		if ($key === false) return new Tokens([]);		if ($increment) $key++;		if ($type === "from") return new Tokens(array_slice($this->tokens, $key));		else return new Tokens(array_slice($this->tokens, $this->iterator, $key));	}	public function skip($count) {		$this->iterator += $count;	}	public function splitOnToken($tokenType) {		$splitTokens = [];		$i = 0;		foreach ($this->tokens as $token) {			if ($token['type'] === $tokenType) $i++;			else $splitTokens[$i][] = $token;		}		return array_map(function ($tokens) {			return new Tokens($tokens);		}, $splitTokens);		//return $splitTokens;	}	public function trim() {		$tokens = $this->tokens;		$tokensToTrim = [Tokenizer::WHITESPACE, Tokenizer::NEW_LINE];		// Remove end whitespace		while ($tokens && in_array(end($tokens)['type'], $tokensToTrim)) {			array_pop($tokens);		}		// Remove begining whitespace		while (isset($tokens[0]) && in_array($tokens[0]['type'], $tokensToTrim)) {			array_shift($tokens);		}		return new Tokens($tokens);	}	public function removeLine() {		$tokens = $this->tokens;		foreach ($tokens as &$token) unset($token['line']);		return new Tokens($tokens);	}	public function read($offset = 0) {		return isset($this->tokens[$offset]) ? $this->tokens[$offset]['value'] : false;	}	public function type($offset = 0) {		return isset($this->tokens[$offset]) ? $this->tokens[$offset]['type'] : false;	}}