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349 lines
10 KiB
PHP
349 lines
10 KiB
PHP
<?php
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namespace Code\Render;
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define("KEY_NOT_EXISTS", '^R_key_not_Exists^');
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class SimpleTemplate implements TemplateEngine
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{
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public static $name = 'internal';
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public $r;
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public $search;
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public $replace;
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public $stack = [];
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public $nodes = [];
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public $done = false;
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public $d = false;
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public $lang = null;
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public $debug = false;
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private function _preg_error()
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{
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switch (preg_last_error()) {
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case PREG_INTERNAL_ERROR:
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echo('PREG_INTERNAL_ERROR');
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break;
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case PREG_BACKTRACK_LIMIT_ERROR:
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echo('PREG_BACKTRACK_LIMIT_ERROR');
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break;
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case PREG_RECURSION_LIMIT_ERROR:
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echo('PREG_RECURSION_LIMIT_ERROR');
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break;
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case PREG_BAD_UTF8_ERROR:
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echo('PREG_BAD_UTF8_ERROR');
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break;
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// This is only valid for php > 5.3, not certain how to code around it for unit tests
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// case PREG_BAD_UTF8_OFFSET_ERROR: echo('PREG_BAD_UTF8_OFFSET_ERROR'); break;
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default:
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// die("Unknown preg error.");
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return;
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}
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echo "<hr><pre>";
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debug_print_backtrace();
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die();
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}
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private function _push_stack()
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{
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$this->stack[] = [ $this->r, $this->nodes ];
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}
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private function _pop_stack()
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{
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list($this->r, $this->nodes) = array_pop($this->stack);
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}
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private function _get_var($name, $retNoKey = false)
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{
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$keys = array_map('trim', explode('.', $name));
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if ($retNoKey && ! array_key_exists($keys[0], $this->r)) {
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return KEY_NOT_EXISTS;
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}
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$val = $this->r;
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foreach ($keys as $k) {
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$val = (isset($val[$k]) ? $val[$k] : null);
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}
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return template_escape($val);
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}
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/**
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* IF node
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* \code
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* {{ if <$var> }}...[{{ else }} ...] {{ endif }}
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* {{ if <$var>==<val|$var> }}...[{{ else }} ...]{{ endif }}
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* {{ if <$var>!=<val|$var> }}...[{{ else }} ...]{{ endif }}
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* \endcode
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*/
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private function _replcb_if($args)
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{
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if (strpos($args[2], '==') > 0) {
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list($a,$b) = array_map('trim', explode('==', $args[2]));
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$a = $this->_get_var($a);
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if ($b[0] == '$') {
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$b = $this->_get_var($b);
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}
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$val = ($a == $b);
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} elseif (strpos($args[2], '!=') > 0) {
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list($a,$b) = array_map('trim', explode('!=', $args[2]));
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$a = $this->_get_var($a);
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if ($b[0] == '$') {
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$b = $this->_get_var($b);
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}
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$val = ($a != $b);
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} else {
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$val = $this->_get_var($args[2]);
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}
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$x = preg_split("|{{ *else *}}|", $args[3]);
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return ( ($val) ? $x[0] : (isset($x[1]) ? $x[1] : EMPTY_STR));
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}
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/**
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* FOR node
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* \code
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* {{ for <$var> as $name }}...{{ endfor }}
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* {{ for <$var> as $key=>$name }}...{{ endfor }}
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* \endcode
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*/
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private function _replcb_for($args)
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{
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$m = array_map('trim', explode(" as ", $args[2]));
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$x = explode('=>', $m[1]);
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if (count($x) == 1) {
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$varname = $x[0];
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$keyname = EMPTY_STR;
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} else {
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list($keyname, $varname) = $x;
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}
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if ($m[0] == EMPTY_STR || $varname == EMPTY_STR || is_null($varname)) {
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die("template error: 'for " . $m[0] . " as " . $varname . "'") ;
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}
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$vals = $this->_get_var($m[0]);
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$ret = EMPTY_STR;
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if (!is_array($vals)) {
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return $ret;
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}
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foreach ($vals as $k => $v) {
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$this->_push_stack();
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$r = $this->r;
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$r[$varname] = $v;
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if ($keyname != EMPTY_STR) {
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$r[$keyname] = (($k === 0) ? '0' : $k);
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}
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$ret .= $this->replace($args[3], $r);
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$this->_pop_stack();
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}
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return $ret;
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}
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/**
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* INC node
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* \code
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* {{ inc <templatefile> [with $var1=$var2] }}{{ endinc }}
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* \endcode
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*/
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private function _replcb_inc($args)
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{
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if (strpos($args[2], 'with')) {
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list($tplfile, $newctx) = array_map('trim', explode("with", $args[2]));
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} else {
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$tplfile = trim($args[2]);
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$newctx = null;
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}
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if ($tplfile[0] == '$') {
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$tplfile = $this->_get_var($tplfile);
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}
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$this->_push_stack();
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$r = $this->r;
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if (! is_null($newctx)) {
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list($a,$b) = array_map('trim', explode('=', $newctx));
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$r[$a] = $this->_get_var($b);
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}
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$this->nodes = [];
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$tpl = Theme::get_template($tplfile);
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$ret = $this->replace($tpl, $r);
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$this->_pop_stack();
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return $ret;
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}
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/**
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* DEBUG node
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* \code
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* {{ debug $var [$var [$var [...]]] }}{{ enddebug }}
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* \endcode
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* replace node with <pre>var_dump($var, $var, ...);</pre>
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*/
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private function _replcb_debug($args)
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{
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$vars = array_map('trim', explode(" ", $args[2]));
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$vars[] = $args[1];
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$ret = "<pre>";
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foreach ($vars as $var) {
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$ret .= htmlspecialchars(var_export($this->_get_var($var), true));
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$ret .= "\n";
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}
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$ret .= "</pre>";
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return $ret;
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}
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private function _replcb_node($m)
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{
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$node = $this->nodes[$m[1]];
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if (method_exists($this, "_replcb_" . $node[1])) {
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$s = call_user_func([$this, "_replcb_" . $node[1]], $node);
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} else {
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$s = "";
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}
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return preg_replace_callback('/\|\|([0-9]+)\|\|/', [$this, "_replcb_node"], $s);
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}
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private function _replcb($m)
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{
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//var_dump(array_map('htmlspecialchars', $m));
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$this->done = false;
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$this->nodes[] = (array) $m;
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return "||" . (count($this->nodes) - 1) . "||";
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}
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private function _build_nodes($s)
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{
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$this->done = false;
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while (!$this->done) {
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$this->done = true;
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$s = preg_replace_callback('|{{ *([a-z]*) *([^}]*)}}([^{]*({{ *else *}}[^{]*)?){{ *end\1 *}}|', [$this, "_replcb"], $s);
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if ($s == null) {
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$this->_preg_error();
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}
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}
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//({{ *else *}}[^{]*)?
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krsort($this->nodes);
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return $s;
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}
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private function var_replace($s)
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{
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$m = [];
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/** regexp:
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* \$ literal $
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* (\[)? optional open square bracket
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* ([a-zA-Z0-9-_]+\.?)+ var name, followed by optional
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* dot, repeated at least 1 time
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* (?(1)\]) if there was opened square bracket
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* (subgrup 1), match close bracket
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*/
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if (preg_match_all('/\$(\[)?([a-zA-Z0-9-_]+\.?)+(?(1)])/', $s, $m)) {
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foreach ($m[0] as $var) {
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$exp = str_replace(["[", "]"], ["", ""], $var);
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$exptks = explode("|", $exp);
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$varn = $exptks[0];
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unset($exptks[0]);
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$val = $this->_get_var($varn, true);
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if ($val != KEY_NOT_EXISTS) {
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/* run filters */
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/*
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* Filter are in form of:
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* filtername:arg:arg:arg
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*
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* "filtername" is function name
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* "arg"s are optional, var value is appended to the end
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* if one "arg"==='x' , is replaced with var value
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*
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* examples:
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* $item.body|htmlspecialchars // escape html chars
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* $item.body|htmlspecialchars|strtoupper // escape html and uppercase result
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* $item.created|date:%Y %M %j // format date (created is a timestamp)
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* $item.body|str_replace:cat:dog // replace all "cat" with "dog"
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* $item.body|str_replace:cat:dog:x:1 // replace one "cat" with "dog"
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*/
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foreach ($exptks as $filterstr) {
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$filter = explode(":", $filterstr);
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$filtername = $filter[0];
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unset($filter[0]);
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$valkey = array_search("x", $filter);
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if ($valkey === false) {
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$filter[] = $val;
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} else {
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$filter[$valkey] = $val;
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}
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if (function_exists($filtername)) {
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$val = call_user_func_array($filtername, $filter);
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}
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}
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$s = str_replace($var, $val, $s);
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}
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}
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}
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return $s;
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}
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private function replace($s, $r)
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{
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return $this->replace_macros($s, $r);
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}
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// TemplateEngine interface
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public function replace_macros($s, $r)
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{
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$this->r = $r;
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$s = $this->_build_nodes($s);
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$s = preg_replace_callback('/\|\|([0-9]+)\|\|/', [$this, "_replcb_node"], $s);
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if ($s == null) {
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$this->_preg_error();
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}
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// remove comments block
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$s = preg_replace('/{#[^#]*#}/', "", $s);
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//$t2 = dba_timer();
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// replace strings recursively (limit to 10 loops)
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$os = "";
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$count = 0;
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while (($os !== $s) && $count < 10) {
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$os = $s;
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$count++;
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$s = $this->var_replace($s);
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}
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return $s;
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}
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public function get_template($file, $root = '')
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{
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$template_file = Theme::include($file, $root);
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if ($template_file) {
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$content = file_get_contents($template_file);
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}
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return $content;
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}
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}
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function template_escape($s)
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{
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return str_replace(['$','{{'], ['!_Doll^Ars1Az_!','!_DoubLe^BraceS4Rw_!'], $s);
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}
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function template_unescape($s)
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{
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return str_replace(['!_Doll^Ars1Az_!','!_DoubLe^BraceS4Rw_!'], ['$','{{'], $s);
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}
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