451 lines
16 KiB
PHP
451 lines
16 KiB
PHP
<?php
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namespace top\library\template\driver\engine;
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use top\traits\Instance;
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/**
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* 模板标签解析
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* Class Template
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* @package lib
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*/
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class Engine
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{
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use Instance;
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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 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 模板配置
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*/
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private $config = [];
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/**
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* @var array 标签库
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*/
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private $libs = [];
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/**
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* @var array 标签库类实例
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*/
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private $libInstance = [];
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/**
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* 构造方法
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* Engine constructor.
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* @param array $config
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*/
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private function __construct($config = [])
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{
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$this->config = $config;
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if (isset($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 = $this->config['right'];
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}
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}
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/**
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* 处理模板继承
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* @param &$template
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*/
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private function parseExtend(&$template)
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{
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$pattern = '/' . $this->left . 'extend\s+file[\s\S]*?=[\s\S]*?[\'"](.*?)[\'"][\s\S]*?\/' . $this->right . '/is';
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preg_match($pattern, $template, $matches);
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if (!empty($matches)) {
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$blockPattern = '/' . $this->left . 'block\s+name[\s\S]*?=[\s\S]*?[\'"](.*?)[\'"][\s\S]*?' . $this->right;
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$blockPattern .= '([\s\S]*?)' . $this->left . '\/block' . $this->right . '/is';
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// 获得被继承的模板内容
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$file = $this->config['path'] . $matches[1] . '.' . ltrim($this->config['ext'], '.');
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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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$this->parseInclude($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, $extendFileContent);
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}
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}
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/**
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* 处理include标签
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* @param &$template
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*/
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private function parseInclude(&$template)
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{
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$pattern = '/' . $this->left . 'include\s+file[\s\S]*?=[\s\S]*?[\'"](.*?)[\'"][\s\S]*?\/' . $this->right . '/is';
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$template = preg_replace_callback($pattern, function ($result) {
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$string = null;
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$file = $this->config['path'] . $result[1] . '.' . ltrim($this->config['ext'], '.');
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if (file_exists($file)) {
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$string = file_get_contents($file);
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}
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return $string;
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}, $template);
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// 处理多层include
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if ($this->hasInclude($template)) {
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$this->parseInclude($template);
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}
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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\s+file[\s\S]*?=[\s\S]*?[\'"](.*?)[\'"][\s\S]*?\/' . $this->right . '/is';
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preg_match($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 &$template
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*/
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private function parseVars(&$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 = mb_substr($matches[1][$i], 0, 1, 'utf8');
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$end = mb_substr($matches[1][$i], -1, null, 'utf8');
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if ($start == '$') { // 输出变量
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$search[] = $matches[0][$i];
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$output = $this->parseParameterOutput($matches[1][$i]);
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$replace[] = '<?php echo htmlentities(' . $output . '); ?>';
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} elseif ($start == ':') { // 调用函数
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$search[] = $matches[0][$i];
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$replace[] = '<?php echo (' . ltrim($matches[1][$i], ':') . '); ?>';
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} elseif ($start == '@') { // 输出常量
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$search[] = $matches[0][$i];
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$replace[] = '<?php echo htmlentities(' . ltrim($matches[1][$i], '@') . '); ?>';
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} elseif ($start == '*' && $end == '*') { // 注释
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$search[] = $matches[0][$i];
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$replace[] = '<?php /* ' . trim($matches[1][$i], '*') . ' */ ?>';
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}
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}
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if (!empty($search) && !empty($replace)) {
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$template = str_replace($search, $replace, $template);
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}
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}
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/**
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* 解析变量输出
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* @param $output
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* @return string
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*/
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private function parseParameterOutput($output)
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{
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// 处理|函数调用
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if (strstr($output, '|')) {
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$functions = explode('|', $output);
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$parse = $functions[0];
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// 只留下函数表达式
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unset($functions[0]);
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// 重置调用函数数组索引以便开始foreach循环
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$functions = array_values($functions);
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foreach ($functions as $function) {
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$expParameters = explode('=', $function);
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$functionName = $expParameters[0];
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// 如果有带上参数，则进行参数处理，没有声明参数则直接将当前值作为函数的第一个参数
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if (isset($expParameters[1])) {
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$parameters = $expParameters[1];
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// 如果有参数，则处理，同时将占位符###替换为上次解析结果
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// 如果存在占位符，则直接替换，没有占位符则将当前值作为函数的第一个参数
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if (strstr($expParameters[1], '###')) {
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$parse = $functionName . '(' . str_replace('###', $parse, $parameters) . ')';
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} else {
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$parse = $functionName . '(' . $parse . ',' . $parameters . ')';
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}
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} else {
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$parse = $functionName . '(' . $parse . ')';
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}
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}
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$output = $parse;
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}
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return $this->parseDotSyntax($output);
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}
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/**
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* 处理.语法
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* @param $string
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* @return null|string|string[]
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*/
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private function parseDotSyntax($string)
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{
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// 处理.语法（仅数组或已实现数组访问接口的对象）
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return preg_replace_callback("/\.([a-zA-Z0-9_-]*)/", function ($match) {
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if (isset($match[1])) {
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return '[' . (is_numeric($match[1]) ? $match[1] : '\'' . $match[1] . '\'') . ']';
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} else {
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return null;
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}
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}, $string);
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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 $prefix
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* @param $className
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*/
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public function loadTaglib($prefix, $className)
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{
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if ($prefix == 'default') {
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throw new \Exception('扩展标签库前缀不能为default');
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}
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$this->libs[$prefix] = $className;
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}
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/**
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* 获取所有标签
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* @return null|string|string[]
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*/
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private function getTags()
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{
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$tags = [];
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// 加入默认标签库
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$this->libs = array_merge(['default' => Tags::class,], $this->libs);
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foreach ($this->libs as $prefix => $lib) {
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$this->libInstance[$prefix] = $object = new $lib;
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foreach ($object->tags as $name => $tag) {
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if (!isset($tags[$name])) { // 如果不存在则加入到标签库
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$tags[($prefix == 'default' ? '' : $prefix . ':') . $name] = $tag;
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}
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}
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}
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return $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 $attr
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* @param string $content
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* @return mixed
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*/
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private function getTagParseResult($name, $attr, $content = '')
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{
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// 如果是扩展标签则找到扩展类进行处理
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if (strstr($name, ':')) {
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$tagInfo = explode(':', $name);
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if (method_exists($this->libInstance[$tagInfo[0]], '_' . $tagInfo[1])) {
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return $this->libInstance[$tagInfo[0]]->{'_' . $tagInfo[1]}($attr, $content);
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}
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} // 否则尝试默认标签处理
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else if (method_exists($this->libInstance['default'], '_' . $name)) {
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return $this->libInstance['default']->{'_' . $name}($attr, $content);
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}
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}
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/**
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* 进行标签处理
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* @param &$template
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*/
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private function parseTags(&$template)
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{
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foreach ($this->getTags() as $name => $item) {
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$pattern = '/' . $this->left . '(?:(' . $name . ')\b(?>[^' . $this->right . ']*)|\/(' . $name . '))';
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$pattern .= $this->right . '/is';
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if ($item['close']) {
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preg_match_all($pattern, $template, $matches, PREG_SET_ORDER | PREG_OFFSET_CAPTURE);
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$nodes = [];
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if (!empty($matches)) {
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// 将匹配结果组合为成对数组
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$start = [];
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foreach ($matches as $match) {
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// 为空则为结束标签
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if ($match[1][0] == '') {
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$tag = array_pop($start);
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$nodes[$match[0][1]] = [
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'name' => $name,
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'start' => $tag[1],
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'end' => $match[0][1],
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'start_str' => $tag[0],
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'end_str' => $match[0][0],
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];
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} else {
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$start[] = $match[0];
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}
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}
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unset($matches, $start);
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krsort($nodes);
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if (!empty($nodes)) {
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$nodes = array_merge($nodes, []);
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$cut = '<!--CONTENT-->';
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$startArray = [];
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foreach ($nodes as $pos => $node) {
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$attr = $item['attr'] ? $this->getAttr($node['start_str'], explode(',', $item['attr'])) : [];
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// 得到准备替换的值
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$replace = explode($cut, $this->getTagParseResult($name, $attr, $cut));
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$replace = [
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(isset($replace[0])) ? $replace[0] : [],
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(isset($replace[1])) ? $replace[1] : [],
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];
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while ($startArray) {
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$begin = end($startArray);
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// 如果当前结束位置大于最后一个开始标签的位置，则跳过，直接去替换这个结束标签
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if ($node['end'] > $begin['start']) {
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break;
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} else {
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// 否则先替换掉这个标签后面的所有开始标签
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$begin = array_pop($startArray);
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$template = substr_replace($template, $begin['string'], $begin['start'], $begin['length']);
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}
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}
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$template = substr_replace($template, $replace[1], $node['end'], strlen($node['end_str']));
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$startArray[] = [
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'start' => $node['start'],
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'length' => strlen($node['start_str']),
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'string' => $replace[0]
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];
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}
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// 替换没有结束标签穿插的开始标签
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while ($startArray) {
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$begin = array_pop($startArray);
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$template = substr_replace($template, $begin['string'], $begin['start'], $begin['length']);
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}
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}
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}
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} else { // 自闭合标签处理
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$template = preg_replace_callback($pattern, function ($matches) use ($name, $item) {
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if (!isset($matches[2])) {
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$attr = $item['attr'] ? $this->getAttr($matches[0], explode(',', $item['attr'])) : [];
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return $this->getTagParseResult($name, $attr);
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}
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return $matches[0];
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}, $template);
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}
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}
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}
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/**
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* 获取属性
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* @param $string
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* @param array $tags
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* @return array
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*/
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private function getAttr($string, $tags = [])
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{
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$attr = [];
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$attrPattern = '/\s+(.*?)=[\s\S]*?([\'"])(.*?)\\2/is';
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preg_match_all($attrPattern, $string, $result);
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if (isset($result[0]) && !empty($result[0])) {
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foreach ($result[1] as $key => $value) {
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$name = str_replace([' ', "\t", PHP_EOL], '', $value);
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if (in_array($name, $tags)) {
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$attr[$name] = $result[3][$key];
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}
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}
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}
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return $attr;
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}
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/**
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* 处理original标签
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* @param &$template
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*/
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private function parseOriginal(&$template)
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{
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$pattern = '/' . $this->left . 'original' . $this->right . '([\s\S]*?)';
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$pattern .= $this->left . '\/original' . $this->right . '/is';
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$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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'<!ORIGINAL--', '--ORIGINAL>',
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'<!PARAM--', '--PARAM>'
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], $matches[1]);
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}, $template);
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}
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/**
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* 还原original内容
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* @param &$template
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*/
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private function returnOriginal(&$template)
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{
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$template = str_replace([
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'<!ORIGINAL--', '--ORIGINAL>',
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'<!PARAM--', '--PARAM>'
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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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}
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/**
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* 获取编译后的内容
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* @param $template
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* @return mixed|null|string|string[]
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*/
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public function compile($template)
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{
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// 处理original标签
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$this->parseOriginal($template);
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// 处理模板继承标签
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$this->parseExtend($template);
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// 处理include标签
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$this->parseInclude($template);
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// 处理定义的标签
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$this->parseTags($template);
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// 处理变量以及函数
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$this->parseVars($template);
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// 还原original内容
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$this->returnOriginal($template);
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// 清除多余开始结束标签
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$template = preg_replace('/\?>([\r|\n|\s]*?)<\?php/is', '', $template);
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return '<?php if (!defined(\'APP_PATH\')) exit; ?>' . $template;
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}
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}
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