private function parseTag(&$content)
{
$regex = $this->getRegex('tag');
if (preg_match_all($regex, $content, $matches, PREG_SET_ORDER)) {
foreach ($matches as $match) {
$str = stripslashes($match[1]);
$flag = substr($str, 0, 1);
switch ($flag) {
case '$':
// 解析模板变量 格式 {$varName}
// 是否带有?号
if (false !== ($pos = strpos($str, '?'))) {
$array = preg_split('/([!=]={1,2}|(?<!-)[><]={0,1})/', substr($str, 0, $pos), 2, PREG_SPLIT_DELIM_CAPTURE);
$name = $array[0];
$this->parseVar($name);
$this->parseVarFunction($name);
$str = trim(substr($str, $pos + 1));
$this->parseVar($str);
$first = substr($str, 0, 1);
if (strpos($name, ')')) {
// $name为对象或是自动识别，或者含有函数
if (isset($array[1])) {
$this->parseVar($array[2]);
$name .= $array[1] . $array[2];
}
switch ($first) {
case '?':
$str = '<?php echo (' . $name . ') ? ' . $name . ' : ' . substr($str, 1) . '; ?>';
break;
case '=':
$str = '<?php if(' . $name . ') echo ' . substr($str, 1) . '; ?>';
break;
default:
$str = '<?php echo ' . $name . '?' . $str . '; ?>';
}
} else {
if (isset($array[1])) {
$this->parseVar($array[2]);
$_name = ' && ' . $name . $array[1] . $array[2];
} else {
$_name = '';
}
// $name为数组
switch ($first) {
case '?':
// {$varname??'xxx'} $varname有定义则输出$varname,否则输出xxx
$str = '<?php echo isset(' . $name . ')' . $_name . ' ? ' . $name . ' : ' . substr($str, 1) . '; ?>';
break;
case '=':
// {$varname?='xxx'} $varname为真时才输出xxx
$str = '<?php if(!empty(' . $name . ')' . $_name . ') echo ' . substr($str, 1) . '; ?>';
break;
case ':':
// {$varname?:'xxx'} $varname为真时输出$varname,否则输出xxx
$str = '<?php echo !empty(' . $name . ')' . $_name . '?' . $name . $str . '; ?>';
break;
default:
if (strpos($str, ':')) {
// {$varname ? 'a' : 'b'} $varname为真时输出a,否则输出b
$str = '<?php echo !empty(' . $name . ')' . $_name . '?' . $str . '; ?>';
} else {
$str = '<?php echo ' . $_name . '?' . $str . '; ?>';
}
}
}
} else {
$this->parseVar($str);
$this->parseVarFunction($str);
$str = '<?php echo ' . $str . '; ?>';
}
break;
case ':':
// 输出某个函数的结果
$str = substr($str, 1);
$this->parseVar($str);
$str = '<?php echo ' . $str . '; ?>';
break;
case '~':
// 执行某个函数
$str = substr($str, 1);
$this->parseVar($str);
$str = '<?php ' . $str . '; ?>';
break;
case '-':
case '+':
// 输出计算
$this->parseVar($str);
$str = '<?php echo ' . $str . '; ?>';
break;
case '/':
// 注释标签
$flag2 = substr($str, 1, 1);
if ('/' == $flag2 || '*' == $flag2 && substr(rtrim($str), -2) == '*/') {
$str = '';
}
break;
default:
// 未识别的标签直接返回
$str = $this->config['tpl_begin'] . $str . $this->config['tpl_end'];
break;
}
$content = str_replace($match[0], $str, $content);
}
unset($matches);
}
return;
}