zuitu团购模板引擎浅析

     接触过最土的朋友应该很熟悉  最土模板解析功能主要由 文件完成 ，就是通过正则的替换，捕获来完成而已，与smarty的原理类似。下面分析下他的正则替换。

         在template.php文件中有这段代码

 

<span  1</span> <span function</span> __parse(<span $tFile</span>,<span $cFile</span><span ) {
</span><span  2</span> 
<span  3</span>     <span $fileContent</span> = <span false</span><span ;
</span><span  4</span> 
<span  5</span>     <span if</span>(!(<span $fileContent</span> = <span file_get_contents</span>(<span $tFile</span><span )))
</span><span  6</span>         <span return</span> <span false</span><span ;
</span><span  7</span> 
<span  8</span>     <span $fileContent</span> = <span preg_replace</span>( '/^(\xef\xbb\xbf)/', '', <span $fileContent</span> ); <span //</span><span EFBBBF   </span>
<span  9</span>     <span $fileContent</span> = <span preg_replace</span>("/\<\!\-\-\s*\\\$\{(.+?)\}\s*\-\-\>/ies", "__replace('<?php \\1; ?>')", <span $fileContent</span><span );
</span><span 10</span>     <span $fileContent</span> = <span preg_replace</span>("/\{(\\\$[a-zA-Z0-9_\[\]\\\ \-\'\,\%\*\/\.\(\)\>\'\"\$\x7f-\xff]+)\}/s", "<?php echo \\1; ?>", <span $fileContent</span><span );
</span><span 11</span>     <span $fileContent</span> = <span preg_replace</span>("/\\\$\{(.+?)\}/ies", "__replace('<?php echo \\1; ?>')", <span $fileContent</span><span );
</span><span 12</span>     <span $fileContent</span> = <span preg_replace</span>("/\<\!\-\-\s*\{else\s*if\s+(.+?)\}\s*\-\-\>/ies", "__replace('<?php } else if(\\1) { ?>')", <span $fileContent</span><span );
</span><span 13</span>     <span $fileContent</span> = <span preg_replace</span>("/\<\!\-\-\s*\{elif\s+(.+?)\}\s*\-\-\>/ies", "__replace('<?php } else if(\\1) { ?>')", <span $fileContent</span><span );
</span><span 14</span>     <span $fileContent</span> = <span preg_replace</span>("/\<\!\-\-\s*\{else\}\s*\-\-\>/is", "<?php } else { ?>", <span $fileContent</span><span );
</span><span 15</span> 
<span 16</span>     <span for</span>(<span $i</span> = 0; <span $i</span> < 5; ++<span $i</span><span ) {
</span><span 17</span>         <span $fileContent</span> = <span preg_replace</span>("/\<\!\-\-\s*\{loop\s+(\S+)\s+(\S+)\s+(\S+)\s*\}\s*\-\-\>(.+?)\<\!\-\-\s*\{\/loop\}\s*\-\-\>/ies", "__replace('<?php if(is_array(\\1)){foreach(\\1 AS \\2=>\\3) { ?>\\4<?php }}?>')", <span $fileContent</span><span );
</span><span 18</span>         <span $fileContent</span> = <span preg_replace</span>("/\<\!\-\-\s*\{loop\s+(\S+)\s+(\S+)\s*\}\s*\-\-\>(.+?)\<\!\-\-\s*\{\/loop\}\s*\-\-\>/ies", "__replace('<?php   if(is_array(\\1)){foreach(\\1 AS \\2) { ?>\\3<?php }}?>')", <span $fileContent</span><span );
</span><span 19</span>         <span $fileContent</span> = <span preg_replace</span>("/\<\!\-\-\s*\{if\s+(.+?)\}\s*\-\-\>(.+?)\<\!\-\-\s*\{\/if\}\s*\-\-\>/ies", "__replace('<?php if(\\1){?>\\2<?php }?>')", <span $fileContent</span><span );
</span><span 20</span>     
<span 21</span> <span     }
</span><span 22</span>     <span //</span><span Add for call <!--{include othertpl}--></span>
<span 23</span>     <span $fileContent</span> = <span preg_replace</span>("#<!--\s*{\s*include\s+([^\{\}]+)\s*\}\s*-->#i", '<?php include template("\\1");?>', <span $fileContent</span><span );
</span><span 24</span> 
<span 25</span>     <span //</span><span Add value namespace</span>
<span 26</span>     <span if</span>(!<span file_put_contents</span>(<span $cFile</span>,<span $fileContent</span><span ))    
</span><span 27</span>         <span return</span> <span false</span><span ;
</span><span 28</span>     
<span 29</span> 
<span 30</span>     <span return</span> <span true</span><span ;
</span><span 31</span> <span }
</span><span 32</span> 
<span 33</span> <span function</span> __replace(<span $string</span><span ) {
</span><span 34</span>     <span return</span> <span str_replace</span>('\"', '"', <span $string</span><span );
</span><span 35</span> }

现在对正则替换进行分析：

第8行

<span $fileContent</span> = <span preg_replace</span>( '/^(\xef\xbb\xbf)/', '', <span $fileContent</span> ); 

是过滤掉windows平台下utf8文件的特殊字符 ï  » ¿

第九行

<span $fileContent</span> = <span preg_replace</span>("/\<\!\-\-\s*\\\$\{(.+?)\}\s*\-\-\>/ies", "__replace('<?php \\1; ?>')", <span $fileContent</span>);

规则浅析：

 

结合模式修正

 

i

 

e “替换后的内容”)

 

s

 

  在{}里执行任何php代码

 <span $fileContent</span> = <span preg_replace</span>("/\{(\\\$[a-zA-Z0-9_\[\]\\\ \-\'\,\%\*\/\.\(\)\>\'\"\$\x7f-\xff]+)\}/s", "<?php echo \\1; ?>", <span $fileContent</span>);

 

 

用于显示内容

第11行

<span $fileContent</span> = <span preg_replace</span>("/\\\$\{(.+?)\}/ies", "__replace('<?php echo \\1; ?>')", <span $fileContent</span>);

 

eg: ${ $a}对应 

第12行

 <span $fileContent</span> = <span preg_replace</span>("/\<\!\-\-\s*\{else\s*if\s+(.+?)\}\s*\-\-\>/ies", "__replace('<?php } else if(\\1) { ?>')", <span $fileContent</span>);

    转为

 

<span $fileContent</span> = <span preg_replace</span>("/\<\!\-\-\s*\{elif\s+(.+?)\}\s*\-\-\>/ies", "__replace('<?php } else if(\\1) { ?>')", <span $fileContent</span>);

 

  转为  

 

<span $fileContent</span> = <span preg_replace</span>("/\<\!\-\-\s*\{else\}\s*\-\-\>/is", "<?php } else { ?>", <span $fileContent</span>);

 

模板里    转为  

第17行

 <span $fileContent</span> = <span preg_replace</span>("/\<\!\-\-\s*\{loop\s+(\S+)\s+(\S+)\s+(\S+)\s*\}\s*\-\-\>(.+?)\<\!\-\-\s*\{\/loop\}\s*\-\-\>/ies", "__replace('<?php if(is_array(\\1)){foreach(\\1 AS \\2=>\\3) { ?>\\4<?php }}?>')", <span $fileContent</span>);

$v) { ?>

>

 

第18行与第17行差不多就是少了$k其他完全一样

 

 

 

第19行

<span $fileContent</span> = <span preg_replace</span>("/\<\!\-\-\s*\{if\s+(.+?)\}\s*\-\-\>(.+?)\<\!\-\-\s*\{\/if\}\s*\-\-\>/ies", "__replace('<?php if(\\1){?>\\2<?php }?>')", <span $fileContent</span>);