434 lines
12 KiB
PHP
434 lines
12 KiB
PHP
<?php
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namespace template;
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/**
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* 模板标签库（支持模板继承）
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* Class Engine
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* @package template
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*/
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class Engine
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{
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/**
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* @var null 单一实例
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*/
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private static $instance = null;
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/**
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* @var string 左定界符
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*/
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private $left = '<';
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/**
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* @var string 右定界符
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*/
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private $right = '>';
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/**
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* @var array 标签定义
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*/
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protected $tags = [];
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/**
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* @var null 模板配置
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*/
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protected $config = null;
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/**
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* @var null 扩展标签库
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*/
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private $extend = [];
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/**
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* @var array 扩展标签库类实例
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*/
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private $extendInstance = [];
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/**
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* @var array 默认标签定义
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*/
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private $defaultTags = [
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'php' => ['attr' => null, 'close' => 1],
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'if' => ['attr' => 'condition', 'close' => 1],
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'else' => ['attr' => 'condition', 'close' => 0],
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'volist' => ['attr' => 'name,id,key', 'close' => 1],
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'assign' => ['attr' => 'name,value', 'close' => 0]
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];
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/**
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* 构造方法
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* Engine constructor.
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* @throws \Exception
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*/
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private function __construct()
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{
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// $this->config = Register::get('Config')->get('view');
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$this->config['dir'] = './demo/';
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if (isset($this->config['left']) && $this->config['left']) {
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$this->left = $this->config['left'];
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}
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if (isset($this->config['right']) && $this->config['right']) {
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$this->right = $this->config['right'];
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}
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}
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/**
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* 获取类单一实例
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* @return null|Engine
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*/
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public static function instance()
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{
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if (!self::$instance) {
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self::$instance = new self();
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}
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return self::$instance;
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}
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/**
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* 处理模板继承
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* @param $template
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* @return mixed
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*/
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private function parseExtend($template)
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{
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$pattern = '#' . $this->left . 'extend +file=[\'"](.*?)[\'"] +/' . $this->right . '#';
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preg_match($pattern, $template, $matches);
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if (!empty($matches)) {
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$blockPattern = '#' . $this->left . 'block +name=[\'"](.*?)[\'"]' . $this->right;
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$blockPattern .= '([\s\S]*?)' . $this->left . '\/block' . $this->right . '#';
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// 获得被继承的模板内容
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$file = $this->config['dir'] . $matches[1] . '.html';
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$extendFileContent = null;
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if (file_exists($file)) {
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$extendFileContent = file_get_contents($file);
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}
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// 处理继承中的include标签
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$tempContent = $this->parseInclude($extendFileContent);
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$extendFileContent = $tempContent !== false ? $tempContent : $extendFileContent;
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// 被继承模板中的块
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preg_match_all($blockPattern, $extendFileContent, $extendResult);
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// 继承模板中的块
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preg_match_all($blockPattern, $template, $templateResult);
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// 组合搜索的块数组
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$search = [];
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$defaultContent = [];
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for ($i = 0; $i < count($extendResult[0]); $i++) {
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$search[$extendResult[1][$i]] = $extendResult[0][$i];
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$defaultContent[$extendResult[1][$i]] = $extendResult[2][$i];
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}
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// 组合替换的块数组
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$replace = [];
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for ($j = 0; $j < count($templateResult[0]); $j++) {
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$replace[$templateResult[1][$j]] = $templateResult[2][$j];
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}
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// 块是否在继承模板中存在
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$searchArray = [];
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$replaceArray = [];
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foreach ($search as $key => $value) {
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$searchArray[] = $value;
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if (isset($replace[$key])) {
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$replaceArray[] = $replace[$key];
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} else {
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$replaceArray[] = $defaultContent[$key];
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}
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}
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$template = str_replace($searchArray, $replaceArray, $extendFileContent);
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}
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return $template;
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}
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/**
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* 处理include标签
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* @param $template
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* @return null|string|string[]
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*/
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private function parseInclude($template)
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{
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$pattern = '#' . $this->left . 'include +file=[\'"](.*?)[\'"] +/' . $this->right . '#';
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$template = preg_replace_callback($pattern, function ($result) {
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$str = null;
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$file = $this->config['dir'] . $result[1] . '.html';
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if (file_exists($file)) {
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$str = file_get_contents($file);
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}
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return $str;
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}, $template);
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// 处理多层include
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if ($this->hasInclude($template)) {
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$template = $this->parseInclude($template);
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}
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return $template;
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}
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/**
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* 检测是否含有include
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* @param $template
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* @return bool
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*/
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private function hasInclude($template)
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{
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$pattern = '#' . $this->left . 'include +file=[\'"](.*?)[\'"] +/' . $this->right . '#';
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preg_match($pattern, $template, $matches);
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return !empty($matches);
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}
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/**
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* 分析参数以及函数输出
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* @param $template
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* @return mixed
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*/
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private function parseVars($template)
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{
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preg_match_all('#{(.*?)}#', $template, $matches);
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$search = [];
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$replace = [];
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for ($i = 0; $i < count($matches[0]); $i++) {
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$start = substr($matches[1][$i], 0, 1);
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$search[] = $matches[0][$i];
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if ($start == '$') {
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$replace[] = '<?php echo (' . $matches[1][$i] . '); ?>';
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} elseif ($start == ':') {
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$replace[] = '<?php echo (' . ltrim($matches[1][$i], ':') . '); ?>';
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} else {
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$replace[] = $matches[0][$i];
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}
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}
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$template = str_replace($search, $replace, $template);
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return $template;
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}
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/**
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* 外部加载扩展标签
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* @param $lib
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*/
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public function loadTaglib($lib)
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{
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$this->extend[] = $lib;
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}
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/**
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* 标签处理
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* @param $template
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* @return null|string|string[]
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*/
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private function parseTags($template)
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{
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foreach ($this->extend as $lib) {
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$this->extendInstance[$lib] = $object = new $lib;
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foreach ($object->tags as $name => $tag) {
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if (!isset($this->tags[$name]) && !isset($this->defaultTags[$name])) {
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$this->tags[$name] = $tag;
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}
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}
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}
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$tags = array_merge($this->defaultTags, $this->tags);
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return $this->_parseTags($template, $tags);
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}
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/**
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* 获取标签处理结果
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* @param $name
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* @param $tagContent
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* @return mixed
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*/
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private function getTagParseResult($name, $tagContent = [])
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{
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if (method_exists($this, $name)) {
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return $this->{$name}($tagContent);
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} else {
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foreach ($this->extendInstance as $item) {
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if (method_exists($item, $name)) {
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return $item->{$name}($tagContent);
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}
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}
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return null;
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}
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}
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/**
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* 进行标签处理
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* @param $template
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* @param $tags
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* @return null|string|string[]
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*/
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private function _parseTags($template, $tags)
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{
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foreach ($tags as $name => $item) {
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$pattern = '#' . $this->left . $name . '(.*?)' . ($item['close'] ? null : '\/') . $this->right . '#';
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preg_match_all($pattern, $template, $matches);
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for ($i = 0; $i < count($matches[0]); $i++) {
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$tag = [];
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if ($item['attr']) {
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$attrPattern = '#(.*?)=[\'"](.*?)[\'"]#';
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preg_match_all($attrPattern, $matches[1][$i], $result);
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if (isset($result[0]) && !empty($result[0])) {
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foreach ($result[1] as $key => $value) {
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$tag[trim($value, ' ')] = $result[2][$key];
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}
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}
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}
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$function = ($item['close']) ? '_' . $name . '_start' : '_' . $name;
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$template = str_replace($matches[0][$i], $this->getTagParseResult($function, $tag), $template);
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}
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if ($item['close']) {
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$closePattern = '#' . $this->left . '\/' . $name . $this->right . '#';
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$template = preg_replace_callback($closePattern, function () use ($name) {
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$function = '_' . $name . '_end';
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return $this->getTagParseResult($function);
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}, $template);
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}
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}
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return preg_replace('#\?>([\r|\n|\s]*?)<\?php#', '', $template);
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}
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/**
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* 处理raw标签
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* @param $template
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* @return null|string|string[]
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*/
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private function parseRaw($template)
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{
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$pattern = '#' . $this->left . 'raw' . $this->right . '([\s\S]*?)';
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$pattern .= $this->left . '\/raw' . $this->right . '#';
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$template = preg_replace_callback($pattern, function ($matches) {
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return str_replace([
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$this->left, $this->right,
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'{', '}'
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], [
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'<raw!--', '--raw>',
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'<-raw!--', '--raw->'
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], $matches[1]);
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}, $template);
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return $template;
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}
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/**
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* 还原raw
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* @param $template
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* @return mixed
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*/
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public function returnRaw($template)
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{
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$template = str_replace([
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'<raw!--', '--raw>',
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'<-raw!--', '--raw->'
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], [
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$this->left, $this->right,
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'{', '}'
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], $template);
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return $template;
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}
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/**
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* php标签开始
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* @return string
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*/
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private function _php_start()
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{
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return '<?php ';
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}
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/**
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* php标签结束
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* @return string
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*/
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private function _php_end()
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{
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return ' ?>';
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}
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/**
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* if标签
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* @param $tag
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* @return string
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*/
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private function _if_start($tag)
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{
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return '<?php if (' . $tag['condition'] . '): ?>';
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}
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/**
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* if标签结束
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* @return string
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*/
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private function _if_end()
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{
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return '<?php endif; ?>';
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}
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/**
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* else标签（支持条件）
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* @param $tag
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* @return string
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*/
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private function _else_start($tag)
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{
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if (isset($tag['condition'])) {
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$parse = '<?php elseif (' . $tag['condition'] . '): ?>';
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} else {
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$parse = '<?php else: ?>';
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}
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return $parse;
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}
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/**
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* volist标签
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* @param $tag
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* @return string
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*/
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private function _volist_start($tag)
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{
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if (substr($tag['name'], 0, 1) == ':') {
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$name = substr($tag['name'], 1);
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} else {
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$name = '$' . $tag['name'];
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}
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$key = (empty($tag['key'])) ? null : '$' . $tag['key'] . ' = 0;';
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$parse = '<?php ' . $key . ' foreach (' . $name . ' as $' . $tag['id'] . '): ';
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$parse .= ($key ? '$' . $tag['key'] . '++;' : null) . ' ?>';
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return $parse;
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}
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/**
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* volist标签结束
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* @return string
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*/
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private function _volist_end()
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{
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return '<?php endforeach; ?>';
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}
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/**
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* assign标签
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* @param $tag
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* @return string
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*/
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private function _assign($tag)
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{
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return '<?php $' . $tag['name'] . ' = ' . $tag['value'] . '; ?>';
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}
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/**
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* 获取编译后的内容
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* @param $template
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* @return bool|mixed|null|string|string[]
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*/
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public function compile($template)
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{
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// 处理raw标签
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$template = $this->parseRaw($template);
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// 处理模板继承标签
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$template = $this->parseExtend($template);
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// 处理include标签
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$template = $this->parseInclude($template);
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// 处理变量以及函数
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$template = $this->parseVars($template);
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// 处理定义的标签
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$template = $this->parseTags($template);
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return $template;
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}
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}
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