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zuitu团购模板引擎浅析_PHP教程

php中文网

发布： 2016-07-20 11:13:45

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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>( '/^()/', '', <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 $fileContent</span> = <span preg_replace</span>("/{(\$[a-zA-Z0-9_[]\ -',%*/.()>'"$-�]+)}/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*{elses*ifs+(.+?)}s*-->/ies", "__replace('<?php } else if(\1) { ?>')", <span $fileContent</span><span );
</span><span 13</span>     <span $fileContent</span> = <span preg_replace</span>("/<!--s*{elifs+(.+?)}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*{loops+(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*{loops+(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*{ifs+(.+?)}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*includes+([^{}]+)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> }

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现在对正则替换进行分析：

第8行

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<span $fileContent</span> = <span preg_replace</span>( '/^()/', '', <span $fileContent</span> );

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是过滤掉windows平台下utf8文件的特殊字符 ï » ¿

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147

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第九行

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

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规则浅析：

结合模式修正

e “替换后的内容”)

在{}里执行任何php代码

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

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用于显示内容

第11行

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

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eg: ${ $a}对应

第12行

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

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转为

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

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转为

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

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模板里转为

第17行

 <span $fileContent</span> = <span preg_replace</span>("/<!--s*{loops+(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>);

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

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