带备注的模板解析类

<?php

//模板解析类
class Parser {
//字段，保存模板内容
private $_tpl;

//构造方法，用于获取模板文件里的内容
public function __construct($_tplFile) {
if (!$this->_tpl = file_get_contents($_tplFile)) {
exit('ERROR：模板文件读取错误！');
}
}

//解析普通变量
private function parVar() {
$_patten = '/\{\$([\w]+)\}/';
if (preg_match($_patten,$this->_tpl)) {
$this->_tpl = preg_replace($_patten,"<?php echo \$this->_vars['$1'];?>",$this->_tpl);
}
}

//解析if语句
private function parIf() {
$_pattenIf = '/\{if\s+\$([\w]+)\}/';
$_pattenEndIf = '/\{\/if\}/';
$_pattenElse = '/\{else\}/';
if (preg_match($_pattenIf,$this->_tpl)) {
if (preg_match($_pattenEndIf,$this->_tpl)) {
$this->_tpl = preg_replace($_pattenIf,"<?php if (\$this->_vars['$1']) {?>",$this->_tpl);
$this->_tpl = preg_replace($_pattenEndIf,"<?php } ?>",$this->_tpl);
if (preg_match($_pattenElse,$this->_tpl)) {
$this->_tpl = preg_replace($_pattenElse,"<?php } else { ?>",$this->_tpl);
}
} else {
exit('ERROR：if语句没有关闭！');
}
}
}

//解析foreach语句
private function parForeach() {
$_pattenForeach = '/\{foreach\s+\$([\w]+)\(([\w]+),([\w]+)\)\}/';
$_pattenEndForeach = '/\{\/foreach\}/';
$_pattenVar = '/\{@([\w]+)([\w\-\>\+]*)\}/';
if (preg_match($_pattenForeach,$this->_tpl)) {
if (preg_match($_pattenEndForeach,$this->_tpl)) {
$this->_tpl = preg_replace($_pattenForeach,"<?php foreach (\$this->_vars['$1'] as \$$2=>\$$3) { ?>",$this->_tpl);
$this->_tpl = preg_replace($_pattenEndForeach,"<?php } ?>",$this->_tpl);
if (preg_match($_pattenVar,$this->_tpl)) {
$this->_tpl = preg_replace($_pattenVar,"<?php echo \$$1$2?>",$this->_tpl);
}
} else {
exit('ERROR：foreach语句必须有结尾标签！');
}
}
}

//解析include语句
private function parInclude() {
$_patten = '/\{include\s+file=(\"|\')([\w\.\-\/]+)(\"|\')\}/';
if (preg_match_all($_patten,$this->_tpl,$_file)) {
foreach ($_file[2] as $_value) {
if (!file_exists('templates/'.$_value)) {
exit('ERROR：包含文件出错！');
}
$this->_tpl = preg_replace($_patten,"<?php \$_tpl->create('$2')?>",$this->_tpl);
}
}
}

//PHP代码注释
private function parCommon() {
$_patten = '/\{#\}(.*)\{#\}/';
if (preg_match($_patten,$this->_tpl)) {
$this->_tpl = preg_replace($_patten,"<?php /* $1 */?>",$this->_tpl);
}
}

//解析系统变量
private function parConfig() {
$_patten = '/<!--\{([\w]+)\}-->/';
if (preg_match($_patten,$this->_tpl)) {
$this->_tpl = preg_replace($_patten,"<?php echo \$this->_config['$1'];?>",$this->_tpl);
}
}

//对外公共方法
public function compile($_parFile) {
//解析模板内容
$this->parVar();
$this->parIf();
$this->parForeach();
$this->parInclude();
$this->parCommon();
$this->parConfig();
//生成编译文件
if (!file_put_contents($_parFile, $this->_tpl)) {
exit('ERROR：编译文件生成出错！');
}
}




}
?>