discuz模板解析注释

1. <?php
   
2. 
   
3. function parse_template($tplfile, $objfile) {
   
4. global $options;
   
5. 
   
6. //循环嵌套次数
   
7. $nest = 3;
   
8. 
   
9. //打开模板文件
   
10. if(!$fp = fopen($tplfile, ‘rb’)) {
    
11. exit(’Current template file not found or have no access!’);
    
12. }
    
13. 
    
14. $template = fread($fp, filesize($tplfile));
    
15. fclose($fp);
    
16. 
    
17. //匹配变量
    
18. //双引号(单引号)内的\具有转义所以，要得到一个必须写为\\；要得到一个$必须写为\$;最后结果为\$,可在正则中使用的变量符号
    
19. $var_regexp = “((\\\$[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*)(\[[a-zA-Z0-9_\-\.\”’[\]\$\x7f-\xff]+\])*)”;
    
20. 
    
21. //匹配字符
    
22. $const_regexp = “([a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*)”;
    
23. 
    
24. //清除缩进(tab)
    
25. $template = preg_replace(”/([\n\r]+)\t+/s”, “\1“, $template);
    
26. 
    
27. //清除注释(<!– –>),方便后续操作，不需要匹配多余的<!–
    
28. $template = preg_replace(”/\<\!\-\-\{(.+?)\}\-\-\>/s”, “{\\1}”, $template);
    
29. 
    
30. //将{LF}替换成一个硬回车(\n)
    
31. $template = str_replace(”{LF}”, “<?=\”\
32. \“?>”, $template);
    
33. 
    
34. //匹配多种变量形式，包括$xxx[”xxxx”]与$xxx[$xxx]、或$xxx
    
35. $template = preg_replace(”/\{(\\\$[a-zA-Z0-9_\[\]\’”$\.\x7f-\xff]+)\}/s”, “<?=\\1?>”, $template);
    
36. 
    
37. //使用/e修正符，可使替换元素以php代码执行后，再进行replace.
    
38. $template = preg_replace(”/$var_regexp/es”, “addquote(’<?=\\1?>’)”, $template);
    
39. 
    
40. //再次替换叠加字符串变量
    
41. $template = preg_replace(”/\<\?\=\<\?\=$var_regexp\?\>\?\>/es”, “addquote(’<?=\\1?>’)”, $template);
    
42. 
    
43. //子模板嵌套解析
    
44. $template = preg_replace(”/[\n\r\t]*\{template\s+([a-z0-9_]+)\}[\n\r\t]*/is”, “
45. <? include template(’\1′); ?>\n”, $template);
    
46. $template = preg_replace(”/[\n\r\t]*\{template\s+(.+?)\}[\n\r\t]*/is”, “
47. <? include template(\\1); ?>\n”, $template);
    
48. 
    
49. //eval语法解析
    
50. $template = preg_replace(”/[\n\r\t]*\{eval\s+(.+?)\}[\n\r\t]*/ies”, “stripvtags(’
51. <? \\1; ?>\n’,”)”, $template);
    
52. 
    
53. //echo语法解析
    
54. $template = preg_replace(”/[\n\r\t]*\{echo\s+(.+?)\}[\n\r\t]*/ies”, “stripvtags(’
55. <? echo \\1; ?>\n’,”)”, $template);
    
56. 
    
57. //elseif语法解析
    
58. $template = preg_replace(”/[\n\r\t]*\{elseif\s+(.+?)\}[\n\r\t]*/ies”, “stripvtags(’
59. <? } elseif(\\1) { ?>\n’,”)”, $template);
    
60. 
    
61. //else语法解析
    
62. $template = preg_replace(”/[\n\r\t]*\{else\}[\n\r\t]*/is”, “
63. <? } else { ?>\n”, $template);
    
64. 
    
65. for($i = 0; $i < $nest; $i++) {
    
66. $template = preg_replace(”/[\n\r\t]*\{loop\s+(\S+)\s+(\S+)\}[\n\r]*(.+?)[\n\r]*\{\/loop\}[\n\r\t]*/ies”, “stripvtags(’
67. <? if(is_array(\\1)) { foreach(\\1 as \\2) { ?>’,'\n\\3\n<? } } ?>\n’)”, $template);
    
68. $template = preg_replace(”/[\n\r\t]*\{loop\s+(\S+)\s+(\S+)\s+(\S+)\}[\n\r\t]*(.+?)[\n\r\t]*\{\/loop\}[\n\r\t]*/ies”, “stripvtags(’
69. <? if(is_array(\\1)) { foreach(\\1 as \\2 => \\3) { ?>’,'\n\\4\n<? } } ?>\n’)”, $template);
    
70. $template = preg_replace(”/[\n\r\t]*\{if\s+(.+?)\}[\n\r]*(.+?)[\n\r]*\{\/if\}[\n\r\t]*/ies”, “stripvtags(’
71. <? if(\\1) { ?>’,'\n\\2\n<? } ?>\n’)”, $template);
    
72. }
    
73. 
    
74. //常量直接输出..
    
75. $template = preg_replace(”/\{$const_regexp\}/s”, “<?=\\1?>”, $template);
    
76. 
    
77. //相临定界符清除(使语法更加连贯)
    
78. $template = preg_replace(”/ \?\>[\n\r]*\<\? /s”, ” “, $template);
    
79. 
    
80. if(!@$fp = fopen($objfile, ‘wb’)) {
    
81. exit(’Directory \’./cache/template/\’ not found or have no access!’);
    
82. }
    
83. 
    
84. //转换链接中的&符号为&使编译模板读取时能够正常不会将其视为引用..
    
85. $template = preg_replace(”/\”(http)?[\w\.\/:]+\?[^\”]+?&[^\”]+?\”/e”, “transamp(’\′)”, $template);
    
86. 
    
87. flock($fp, 2);
    
88. fwrite($fp, $template);
    
89. fclose($fp);
    
90. }
    
91. 
    
92. //转换&避免&以引用方式执行..
    
93. function transamp($str) {
    
94. $str = str_replace(’&’, ‘&’, $str);
    
95. $str = str_replace(’&’, ‘&’, $str);
    
96. $str = str_replace(’”‘, ‘”‘, $str);
    
97. return $str;
    
98. }
    
99. 
    
100. //将$var字符串，转换为可执行的php代码形式,并返回其结果..
     
101. //\”转换为”,将为[xxx]转换为[’xxx’]
     
102. function addquote($var) {
     
103. return str_replace(”\\”", “”", preg_replace(”/\[([a-zA-Z0-9_\-\.\x7f-\xff]+)\]/s”, “[’\1′]”, $var));
     
104. }
     
105. 
     
106. //设置语言变量
     
107. function languagevar($var) {
     
108. return $GLOBALS[’language’][$var] ? $GLOBALS[’language’][$var] : “!$var!”;
     
109. }
     
110. //清理或转换标签为php语法
     
111. function stripvtags($expr, $statement) {
     
112. $expr = str_replace(”\\”", “”", preg_replace(”/\<\?\=(\\\$.+?)\?\>/s”, “\1“, $expr));
     
113. $statement = str_replace(”\\”", “”", $statement);
     
114. return $expr.$statement;
     
115. }
     
116. 
     
117. ?>

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