Write a simple template engine by yourself

After leaving home, I suddenly found that nothing was done. I studied smarty and wrote a simple search engine. Include

Assign assignment, display template parsing method,

Create a new MyTpl. class. php (other names are also supported)

The Code is as follows:

<? Phpclass MyTpl {// initialize function _ construct ($ template_dir = 'templates/', $ compile_dir = 'templates _ C ') {$ this-> template_dir = rtrim ($ template_dir ,'/'). '/'; $ this-> compile_dir = rtrim ($ compile_dir ,'/'). '/'; $ this-> tpl_vars = array ();} // value assignment function assign ($ tpl_var, $ value = null) {if ($ tpl_var! = '') $ This-> tpl_vars [$ tpl_var] = $ value;} // template parsing function display ($ fileName) {$ tplFile = $ this-> template_dir. $ fileName; if (! File_exists ($ tplFile) return false; $ comFileName = $ this-> compile_dir. 'com _ '. basename ($ tplFile).'. php'; if (! File_exists ($ comFileName) | filemtime ($ comFileName) <filemtime ($ tplFile) {$ repContent = $ this-> tpl_replace (file_get_contents ($ tplFile )); $ handle = fopen ($ comFileName, 'W + '); fwrite ($ handle, $ repContent); fclose ($ handle);} require_once $ comFileName ;} // template replacement function private function tpl_replace ($ content) {$ pattern = array ('/<\ {\ s * \ $ ([a-zA-Z _ \ x7f-\ xff] [a-zA-Z0-9 _ \ x7f-xff] *) \ s * \}>/I ', // parses the variable'/<\ {\ s * if \ s *(. + ?) \ S * \}> (. + ?) <\ {\ S * \/if \ s * \}>/ies ', // if tag parsing '/<\ {\ s * else \ s * if \ s *(. + ?) \ S * \}>/', // elseif parsing'/<\ {\ s * else \ s * \}> /', // else parsing '/<\ {\ s * loop \ s + \ $ (\ S +) \ s + \ $ ([a-zA-Z _ \ x7f-\ xff] [a-zA-Z0-9 _ \ x7f-\ xff] *) \ s * \}> (. + ?) <\ {\ S * \/loop \ s *}>/is ', // match the loop tag '/<\ {\ s * loop \ s + \ $ (\ S +) \ s + \ $ ([a-zA-Z _ \ x7f-\ xff] [a-zA-Z0-9 _ \ x7f-\ xff] *) \ s * => \ s * \ $ (\ S +) \ s * \}> (. + ?) <\ {\ S * \/loop \ s * \}>/is> /', // traverse the keys and values in the loop '/<\ {\ s * include \ s + [\ "\']? (. + ?) [\ "\ ']? \ S * \}>/ie ', // match include); // replace it with php $ replacement = array (' <? Php echo $ this-> tpl_vars ["$ {1}"]?> ', // Replace the variable' $ this-> stripvtags (\ '<? Php if ($ {1}) {?> \ ', \' $ {2} <? Php }?> \ ')', '$ This-> stripvtags (\' <? Php} elseif ($ {1}) {?> \ ', "")', '<? Php} else {?> ',' <? Php foreach ($ this-> tpl_vars ["$ {1}"] as $ this-> tpl_vars ["$ {2}"]) {?> $ {3} <? Php }?> ',' <? Php foreach ($ this-> tpl_vars ["$ {1}"] as $ this-> tpl_vars ["$ {2}"] =>$ this-> tpl_vars ["$ {3} "]) {?> $ (4) <? Php }?> ', 'File _ get_contents ($ this-> template_dir. "$ {1}") '); $ repContent = preg_replace ($ pattern, $ replacement, $ content ); if (preg_match ('/<\ {([^ (\}>)] {1,}) \}>/', $ repContent )) {$ repContent = $ this-> tpl_replace ($ repContent);} return $ repContent;} // replace the value of private function str1_tags ($ expr, $ statement) in the Condition statement) {$ var_pattern = '/\ s * \ $ ([a-zA-Z _ \ x7f-\ xff] [a-zA-Z0-9 _ \ x7f-\ xff] *) \ s */is '; $ expr = preg_replace ($ var_pattern,' $ this-> tpl_vars ["$ {1}"] ', $ expr ); $ expr = str_replace ("\\\" "," \ "", $ expr); $ statement = str_replace ("\\\"","\"", $ statement); return $ expr. $ statement ;}}

The above is very simple, that is, assigning values, and then outputting the template after parsing. the most complicated part is the regular expression replacement, which has been written for a long time. If you have time, please refer to smarty.

Next, let's test and create an inde. php

Require_once 'ins INS/MyTpl. class. php '; $ Tpl = new MyTpl (); $ title = 'first title'; $ Tpl-> assign ('title', $ title ); $ Tpl-> display ('index. tpl ');

Create a new templates directory, and write other templates_c directories according to the actual situation. then create an index. tpl in templates and write the corresponding code. I just did a simple test,

Then, you can preview it in the browser. In the regular expression replacement that I wrote, the foreach replacement label of a loop is also included. You can continue to expand and improve, and I will continue to improve my own template engine.
This article is from the "Thunder" blog, please be sure to keep this source http://a3147972.blog.51cto.com/2366547/1253462