/**
The class name Smarty is a custom template engine
The template file is loaded and parsed by the class object, and the parsed result is output
*/
Class Smarty {
Public $template _dir = ' templates '; Define the directory where template files are stored
Public $compile _dir = ' Templates_c '; Define the file directory after the template engine is combined
Public $left _delimiter = ' <{';//embed the left-bound symbol of the dynamic Data variable in the template
Public $right _delimiter = '}> '; Embed a right-bound symbol for a dynamic data variable in a template
Private $TPL _vars = Array (); Temporary variables for internal use
/**
The values assigned in PHP are saved to the member property $tpl_vars, which is used to replace the corresponding variables in the board
@paramString$TPL _varA string parameter is required as an associative array subscript, which corresponds to the variable name in the template
@paramMixed$valueA value of scalar type is required to assign to the value of a variable in the template
*/
function assign ($tpl _var, $value = null) {
if ($tpl _var! = ")
$this->tpl_vars[$tpl _var] = $value;
}
/**
Loads the template file under the specified directory and stores the replaced content generation combination file in another specified directory
@paramString$fileNameProvide file name for template files
*/
function display ($fileName) {
/* Find the template file in the specified directory */
$tplFile = $this->template_dir. '/'. $fileName;
/* Exit and report an error if the template file that needs to be processed does not exist */
if (!file_exists ($tplFile)) {
Die ("template file {$tplFile} does not exist! ");
}
/* Gets the combined template file, the contents of which are replaced by */
$comFileName = $this->compile_dir. " /com_ ". $fileName. PHP ';
/* To determine if the replaced file exists or exists but has changed, it needs to be recreated */
if (!file_exists ($comFileName) | | filemtime ($COMFILENAME) < Filemtime ($tplFile)) {
/* Invoke Internal replacement Template method */
$repContent = $this->tpl_replace (file_get_contents ($tplFile));
/* Save the script file that was assembled by the system */
File_put_contents ($comFileName, $repContent);
}
/* Contains the processed template file output to the client */
Include ($comFileName);
}
/**
Private methods used internally, using regular expressions to replace the statements in the template file ' <{}> ' with corresponding values or PHP code
@paramString$contentProvides a full string of content that is read from the template file
@return$repContentReturns the replaced string
*/
Private Function Tpl_replace ($content) {
/* Leave the left and right bounding symbols, with special symbols that affect the regular sign escape for example, <{}> escape \<\{\}\> */
$left = Preg_quote ($this->left_delimiter, '/');
$right = Preg_quote ($this->right_delimiter, '/');
/* pattern array of regular expressions that match the various identifiers in the template */
$pattern = Array (
/* Match the variables in the template, for example, "<{$var}>" */
'/'. $left. ' \s*\$ ([a-za-z_\x7f-\xff][a-za-z0-9_\x7f-\xff]*) \s* '. $right. ' /I ',
/* Match the If identifier in the template, such as "<{if $col = =" Sex "}> <{/if}>" * *
'/'. $left. ' \s*if\s* (. +?) \s* '. $right. ' (.+?)'. $left. ' \s*\/if\s* '. $right. ' /ies ',
/* Match ElseIf identifiers, such as "<{elseif $col = =" Sex "}>" */
'/'. $left. ' \s*else\s*if\s* (. +?) \s* '. $right. ' /ies ',
/* Match else identifier, for example "<{else}>" */
'/'. $left. ' \s*else\s* '. $right. ' /is ',
/* is used to match the loop identifier in the template to iterate through the values in the array, such as "<{loop $arrs $value}> <{/loop}>" */
'/'. $left. ' \s*loop\s+\$ (\s+) \s+\$ ([a-za-z_\x7f-\xff][a-za-z0-9_\x7f-\xff]*) \s* '. $right. ' (.+?)'. $left. ' \s*\/loop\s* '. $right. ' /is ',
/* is used to iterate through the keys and values in the array, such as "<{loop $arrs $key = = $value}> <{/loop}>" */
'/'. $left. ' \s*loop\s+\$ (\s+) \s+\$ ([a-za-z_\x7f-\xff][a-za-z0-9_\x7f-\xff]*) \s*=>\s*\$ (\s+) \s* '. $right. ' (.+?)'. $left. ' \s*\/loop \s* '. $right. ' /is ',
/* Match the include identifier, for example, ' <{include ' header.html '}> ' */
'/'. $left. ' \s*include\s+[\ "\ '"? (.+?) [\ ' \ ']?\s* '. $right. ' /ie '
);
/* Replace the array of strings that are matched to the regular expression from the template */
$replacement = Array (
/* Replace the variables in the template Tpl_vars["var"]; */
' tpl_vars["${1}"];?> ',
/* Replace the IF string in the template */
' $this->stripvtags (\ ' \ ', \ ' ${2} \')',
/* Replace the ElseIf string */
' $this->stripvtags (\ ' \',"")',
/* Replace the Else string */
' ',
/* The following two are used to replace the loop identifier in the template with the foreach format */
' tpl_vars["${1}"] as $this->tpl_vars["${2}"]) {? >${3} ',
' tpl_vars["${1}"] as $this->tpl_vars["${2}"] = = $this->tpl_vars["${3}"]) {? >${4} ',
/* Replace the Include string */
' File_get_contents ($this->template_dir. " /${1} ") '
);
/* Use regular replace function to process */
$repContent = Preg_replace ($pattern, $replacement, $content);
/* If there is an identity to replace, recursively call yourself to replace */
if (Preg_match ('/'. $left. ' ([^ ('. $right. ')] {1,}) '. $right. ' /', $repContent)) {
$repContent = $this->tpl_replace ($repContent);
}
/* Returns the replaced String */
return $repContent;
}
/**
Private method used internally to replace the variable used in the conditional statement with the corresponding value
@paramString$exprProvides the start tag of a conditional statement in a template
@paramString$statement provide a closing tag for a conditional statement in a template
@returnStrinReturns after the processed conditional statement is connected
*/
Private Function Stripvtags ($expr, $statement = ") {
/* Match variable's regular */
$var _pattern = '/\s*\$ ([a-za-z_\x7f-\xff][a-za-z0-9_\x7f-\xff]*) \s*/is ';
/* Replace the variable with a value */
$expr = Preg_replace ($var _pattern, ' $this->tpl_vars[' ${1} "] ', $expr);
/* Escape the quotation marks in the start tag by replacing */
$expr = Str_replace ("\\\" "," \ "", $expr);
/* Replace quotation marks in statement body and closing tag */
$statement = Str_replace ("\\\" "," \ "", $statement);
/* Returns the processed conditional statement to the back */
return $expr. $statement;
}
}
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The above describes the PHP regular expression-imitation smarty, including the aspects of the content, I hope that the PHP tutorial interested in a friend helpful.
