smarty编译过程

（基于V2.6.20）

1,Smarty.class.php

//构造函数

function Smarty()

{

$this->assign('SCRIPT_NAME', ...);

}

//assign函数

function assign($tpl_var, $value = null)

{

if (is_array($tpl_var)){ //可以直接传递数组

foreach ($tpl_var as $key => $val) {

if ($key != '') {

$this->_tpl_vars[$key] = $val;

}

}

} else {

if ($tpl_var != '')

$this->_tpl_vars[$tpl_var] = $value;

}

}

重要：$this->_tpl_vars是保存模板变量的

//display方法

function display($resource_name, $cache_id = null, $compile_id = null)

{

$this->fetch($resource_name, $cache_id, $compile_id, true);

}

//这个方法的逻辑还没有完全梳理清楚

function fetch($resource_name, $cache_id = null, $compile_id = null, $display = false)

{

//debug....

//cache....

//调用方法_compile_resource来编译

}

//

function _compile_resource($resource_name, $compile_path)

{

//调用方法_compile_source

}

/**

* 编译给出的模板文件

*

* @param string $resource_name

* @param string $source_content

* @param string $compiled_content

* @return boolean

*/

function _compile_source($resource_name, &$source_content, &$compiled_content, $cache_include_path=null)

{

if (file_exists(SMARTY_DIR . $this->compiler_file)) {

require_once(SMARTY_DIR . $this->compiler_file);

} else {

// use include_path

require_once($this->compiler_file);

}

//实例化编译对象

$smarty_compiler = new $this->compiler_class; //Smarty_Compiler

//初始化编译对象（传递相关的变量，包括上面的模板变量）

$smarty_compiler->template_dir = $this->template_dir;

$smarty_compiler->compile_dir = $this->compile_dir;

$smarty_compiler->plugins_dir = $this->plugins_dir;

$smarty_compiler->config_dir = $this->config_dir;

$smarty_compiler->force_compile = $this->force_compile;

$smarty_compiler->caching = $this->caching;

$smarty_compiler->php_handling = $this->php_handling;

$smarty_compiler->left_delimiter = $this->left_delimiter;

$smarty_compiler->right_delimiter = $this->right_delimiter;

$smarty_compiler->_version = $this->_version;

$smarty_compiler->security = $this->security;

$smarty_compiler->secure_dir = $this->secure_dir;

$smarty_compiler->security_settings = $this->security_settings;

$smarty_compiler->trusted_dir = $this->trusted_dir;

$smarty_compiler->use_sub_dirs = $this->use_sub_dirs;

$smarty_compiler->_reg_objects = &$this->_reg_objects;

$smarty_compiler->_plugins = &$this->_plugins;

$smarty_compiler->_tpl_vars = &$this->_tpl_vars; //模板变量

$smarty_compiler->default_modifiers = $this->default_modifiers;

$smarty_compiler->compile_id = $this->_compile_id;

$smarty_compiler->_config = $this->_config;

$smarty_compiler->request_use_auto_globals = $this->request_use_auto_globals;

if (isset($cache_include_path) && isset($this->_cache_serials[$cache_include_path])) {

$smarty_compiler->_cache_serial = $this->_cache_serials[$cache_include_path];

}

$smarty_compiler->_cache_include = $cache_include_path;

//编译

$_results = $smarty_compiler->_compile_file($resource_name, $source_content, $compiled_content);

if ($smarty_compiler->_cache_serial) {

$this->_cache_include_info = array(

'cache_serial'=>$smarty_compiler->_cache_serial

,'plugins_code'=>$smarty_compiler->_plugins_code

,'include_file_path' => $cache_include_path);

} else {

$this->_cache_include_info = null;

}

return $_results;

}

2,Smarty_Compiler.class.php

//构造函数

function Smarty_Compiler(){

//初始化各种匹配用的正则表达式，例如匹配函数的：$this->_func_regexp = '[a-zA-Z_]\w*';

}

//编译，使用$compiled_content返回编译好的php代码

/*

返回的代码包括两部分：

1，头部，如下：

<?php //Smarty version 2.6.20, created on 2009-12-21 10:38:57 compiled from index.tpl

?>

<?php

require_once(SMARTY_CORE_DIR . 'core.load_plugins.php');

//加载自定义插件，如load_data

smarty_core_load_plugins(array('plugins' => array(array('function', 'load_data', 'index.tpl', 20, false),)), $this); ?>

<?php $_smarty_tpl_vars = $this->_tpl_vars; //模板变量赋值

//加载头部模板

$this->_smarty_include(array('smarty_include_tpl_file' => 'header.tpl', 'smarty_include_vars' => array()));

$this->_tpl_vars = $_smarty_tpl_vars;

unset($_smarty_tpl_vars);

?>

2，模板主体

*/

function _compile_file($resource_name, $source_content, &$compiled_content){

//处理文本块

//编译所有标签，调用_compile_tag方法（重要）

}

注：

1，literal标签内的数据smarty不会去分析（可用于显示有可能包含大括号等字符信息的 javascript脚本）

2，可以使用php标签来嵌套php代码

参考：http://code.google.com/p/cyy0523xc/source/browse/trunk/php/Smarty%E7%BC%96%E8%AF%91%E8%BF%87%E7%A8%8B.txt