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authorKevin Chabowski <kevin@kch42.de>2011-09-17 22:30:05 +0200
committerKevin Chabowski <kevin@kch42.de>2011-09-17 22:30:05 +0200
commit477914e29b713dddb65ee09d9957c1bb231210b7 (patch)
tree2a692f4a1c3ea720bdfd256543a2b300ee7a7fc9 /transform.php
parent6ab5c3fac3fdd1a768cd3c042c5a69f37c0f5377 (diff)
downloadste-477914e29b713dddb65ee09d9957c1bb231210b7.tar.gz
ste-477914e29b713dddb65ee09d9957c1bb231210b7.tar.bz2
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Finished first untested version of STE, now we will debug this thing...
Diffstat (limited to 'transform.php')
-rw-r--r--transform.php686
1 files changed, 632 insertions, 54 deletions
diff --git a/transform.php b/transform.php
index 21f0068..5f87f70 100644
--- a/transform.php
+++ b/transform.php
@@ -1,5 +1,7 @@
<?php
+namespace ste;
+
class TextNode
{
public $text;
@@ -16,6 +18,28 @@ class VariableNode
{
public $name;
public $arrayfields;
+ public function transcompile()
+ {
+ $varaccess = '@$ste->vars[' . (is_numeric($this->name) ? $this->name : '\'' . escape_text($this->name) . '\''). ']';
+ foreach($this->arrayfields as $af)
+ {
+ if((count($af) == 1) and ($af[0] instanceof TextNode) and is_numeric($af->text))
+ $varaccess .= '[' . $af->text . ']';
+ else
+ $varaccess .= '[' . implode(".",
+ array_map(
+ function($node)
+ {
+ if($node instanceof TextNode)
+ return "'" . escape_text($node->text) . "'";
+ else if($node instanceof VariableNode)
+ return $node->transcompile;
+ }, $af
+ )
+ ). ']';
+ }
+ return $varaccess;
+ }
}
/* $text must start after the first opening bracket */
@@ -201,69 +225,73 @@ function parse($code)
}
define("MODE_SOURCE", 0);
-define("MODE_AST", 1);
-define("MODE_TRANSCOMPILED", 2);
+define("MODE_TRANSCOMPILED", 1);
-/*interface StorageAccess
+interface StorageAccess
{
- abstract public function get_load_options();
- abstract public function get_save_options();
-
- abstract public function load($tpl);
- abstract public function save($tpl, $data, $mode);
+ public function load($tpl, &$mode);
+ public function save($tpl, $data, $mode);
}
class FilesystemStorageAccess implements StorageAccess
{
protected $sourcedir;
- protected $astdir;
protected $transcompileddir;
- protected $load_options;
- protected $save_options;
-
- public function __construct($src, $ast, $transc)
+ public function __construct($src, $transc)
{
$this->sourcedir = $src;
- $this->astdir = $ast;
$this->transcompileddir = $transc;
+ }
+
+ public function load($tpl, &$mode)
+ {
+ $src_fn = $this->sourcedir . "/" . $tpl;
+ $transc_fn = $this->transcompileddir . "/" . $tpl;
- if(!empty($this->sourcedir))
+ if($mode == MODE_SOURCE)
{
- if(is_readable($this->sourcedir))
- $this->load_options[] = MODE_SOURCE;
- if(is_writeableable($this->sourcedir))
- $this->save_options[] = MODE_SOURCE;
+ $content = @file_get_contents($src_fn);
+ if($content === False)
+ throw new Exception("Template not found.");
+ return $content;
}
- if(!empty($this->astdir))
+ $src_stat = @stat($src_fn);
+ $transc_stat = @stat($transc_fn);
+
+ if(($src_stat === False) and ($transc_stat === False))
+ throw new Exception("Template not found.");
+ else if($transc_stat === False)
{
- if(is_readable($this->astdir))
- $this->load_options[] = MODE_AST;
- if(is_writeableable($this->astdir))
- $this->save_options[] = MODE_AST;
+ $mode = MODE_SOURCE;
+ return file_get_contents($src_fn);
}
-
- if(!empty($this->transcompileddir))
+ else if($src_stat === False)
{
- if(is_readable($this->transcompileddir))
- $this->load_options[] = MODE_TRANSCOMPILED;
- if(is_writeableable($this->transcompileddir))
- $this->save_options[] = MODE_TRANSCOMPILED;
+ include($transc_fn);
+ return $transcompile_fx;
+ }
+ else
+ {
+ if($src_stat["mtime"] > $transc_stat["mtime"])
+ {
+ $mode = MODE_SOURCE;
+ return file_get_contents($src_fn);
+ }
+ else
+ {
+ include($transc_fn);
+ return $transcompile_fx;
+ }
}
-
- if(empty($this->save_options) and empty($this->load_options))
- throw new Exception("No dir read-/writeable!");
}
- public function get_load_options() { return $this->load_options; }
- public function get_save_options() { return $this->save_options; }
-
- public function load($tpl)
+ public function save($tpl, $data, $mode)
{
- if(@stat($this->sourcedir)
+ file_put_contents((($mode == MODE_SOURCE) ? $this->sourcedir : $this->transcompileddir) . "/" . $tpl, $data);
}
-}*/
+}
function indent_code($code)
{
@@ -280,8 +308,134 @@ function indent_code($code)
function shunting_yard($infix_math)
{
$operators = array(
- "+" => array()
+ "+" => array("l", 2),
+ "-" => array("l", 2),
+ "*" => array("l", 3),
+ "/" => array("l", 3),
+ "^" => array("r", 4),
+ "_" => array("r", 5),
+ "(" => array("", 0),
+ ")" => array("", 0)
);
+
+ preg_match_all("/\s*(?:(?:[+\\-\\*\\/\\^\\(\\)])|(\\d*[\\.]?\\d*))\\s*/s", $infix_math, $tokens, PREG_PATTERN_ORDER);
+ $tokens_raw = array_filter(array_map('trim', $tokens[0]), function($x) { return !empty($x); });
+
+ $output_queue = array();
+ $op_stack = array();
+
+ $lastpriority = NULL;
+ /* Make - unary, if neccessary */
+ $tokens = array();
+ foreach($tokens_raw as $token)
+ {
+ $priority = isset($operators[$token]) ? $operators[$token][1] : -1;
+ if(($token == "-") and (($lastpriority === NULL) or ($lastpriority >= 0)))
+ {
+ $priority = $operators["_"][1];
+ $tokens[] = "_";
+ }
+ else
+ $tokens[] = $token;
+ $lastpriority = $priority;
+ }
+
+ while(!empty($tokens))
+ {
+ $token = array_shift($tokens);
+ if(is_numeric($token))
+ $output_queue[] = $token;
+ else if($token == "(")
+ $op_stack[] = $token;
+ else if($token == ")")
+ {
+ $lbr_found = False;
+ while(!empty($op_stack))
+ {
+ $op = array_pop($op_stack);
+ if($op == "(")
+ {
+ $lbr_found = True;
+ break;
+ }
+ $output_queue[] = $op;
+ }
+ if(!$lbr_found)
+ throw new Exception("Bracket mismatch.");
+ }
+ else if(!isset($operators[$token]))
+ throw new Exception("Invalid token ($token): Not a number, bracket or operator. Stop.");
+ else
+ {
+ $priority = $operators[$token][1];
+ if($operators[$token][0] == "l")
+ while((!empty($op_stack)) and ($priority <= $operators[$op_stack[count($op_stack)-1]][1]))
+ $output_queue[] = array_pop($op_stack);
+ else
+ while((!empty($op_stack)) and ($priority < $operators[$op_stack[count($op_stack)-1]][1]))
+ $output_queue[] = array_pop($op_stack);
+ $op_stack[] = $token;
+ }
+ }
+
+ while(!empty($op_stack))
+ {
+ $op = array_pop($op_stack);
+ if($op == "(")
+ throw new Exception("Bracket mismatch...");
+ $output_queue[] = $op;
+ }
+
+ return $output_queue;
+}
+
+function pop2(&$array)
+{
+ $rv = array(array_pop($array), array_pop($array));
+ if(array_search(NULL, $rv, True) === False)
+ throw new Exception("Not enough numbers on stack. Invalid formula.");
+ return $rv;
+}
+
+function calc_rpn($rpn)
+{
+ $stack = array();
+ foreach($rpn as $token)
+ {
+ switch($token)
+ {
+ case "+":
+ list($b, $a) = pop2($stack);
+ $stack[] = $a + $b;
+ break;
+ case "-":
+ list($b, $a) = pop2($stack);
+ $stack[] = $a - $b;
+ break;
+ case "*":
+ list($b, $a) = pop2($stack);
+ $stack[] = $a * $b;
+ break;
+ case "/":
+ list($b, $a) = pop2($stack);
+ $stack[] = $a / $b;
+ break;
+ case "^":
+ list($b, $a) = pop2($stack);
+ $stack[] = pow($a, $b);
+ break;
+ case "_":
+ $a = array_pop($stack);
+ if($a === NULL)
+ throw new Exception("Not enough numbers on stack. Invalid formula.");
+ $stack[] = -$a;
+ break;
+ default:
+ $stack[] = $token;
+ break;
+ }
+ }
+ return array_pop($stack);
}
$ste_builtins = array(
@@ -305,7 +459,8 @@ $ste_builtins = array(
if(empty($then))
throw new Exception("Transcompile error: Missing <ste:else> in <ste:if>. Stop.");
- $output .= transcompile($condition);
+ $output .= "\$outputstack[] = \"\";\n\$outputstack_i++;\n";
+ $output .= _transcompile($condition);
$output .= "\$outputstack_i--;\nif(\$ste->bool(array_pop(\$outputstack)))\n{\n";
$output .= indent_code(transcompile($then));
$output .= "}\n";
@@ -319,65 +474,488 @@ $ste_builtins = array(
},
"cmp" => function($ast)
{
+ $code = "";
+ $code .= "\$outputstack[] = '';\n\$outputstack_i++;\n";
+ if(isset($ast->params["var_b"]))
+ {
+ $code .= _transcompile($ast->params["var_b"]);
+ $b = '$ste->get_var_by_name(array_pop($outputstack))';
+ }
+ else if(isset($ast->params["text_b"]))
+ {
+ $code .= _transcompile($ast->params["text_b"]);
+ $b = 'array_pop($outputstack)';
+ }
+ else
+ throw new Exception("Transcompile error: neiter var_b nor text_b set in <ste:cmp>. Stop.");
+
+ $code .= "\$outputstack[] = '';\n\$outputstack_i++;\n";
+ if(isset($ast->params["var_a"]))
+ {
+ $code .= _transcompile($ast->params["var_a"]);
+ $a = '$ste->get_var_by_name(array_pop($outputstack))';
+ }
+ else if(isset($ast->params["text_a"]))
+ {
+ $code .= _transcompile($ast->params["text_a"]);
+ $a = 'array_pop($outputstack)';
+ }
+ else
+ throw new Exception("Transcompile error: neiter var_a nor text_a set in <ste:cmp>. Stop.");
+
+ $code .= "\$outputstack[] = '';\n\$outputstack_i++;\n";
+ if(isset($ast->params["op"]))
+ $code .= _transcompile($ast->params["op"]);
+ else
+ throw new Exception("Transcompile error: op not given in <ste:cmp>. Stop.");
+
+ $code .= "\$outputstack_i -= 3;\nswitch(trim(array_pop(\$outputstack)))\n{\n\t";
+ $code .= implode("", array_map(
+ function($op) use ($a,$b)
+ {
+ list($op_stetpl, $op_php) = $op;
+ return "case '$op_stetpl':\n\t\$outputstack[\$outputstack_i] .= (($a) $op_php ($b)) ? 'yes' : '';\n\tbreak;\n\t";
+ },
+ array(
+ array('eq', '=='),
+ array('neq', '!='),
+ array('lt', '<'),
+ array('lte', '<='),
+ array('gt', '>'),
+ array('gte', '>=')
+ )
+ ));
+ $code .= "default: throw new Exception('Runtime Error: Unknown operator in <ste:cmp>.');\n}\n";
+ return $code;
},
"not" => function($ast)
{
-
+ $code = "\$outputstack[] = '';\n\$outputstack_i++;\n";
+ $code .= _transcompile($ast->sub);
+ $code .= "\$outputstack_i--;\n\$outputstack[\$outputstack_i] .= (!\$ste->bool(array_pop(\$outputstack))) ? 'yes' : '';\n";
+ return $code;
},
"even" => function($ast)
{
-
+ $code = "\$outputstack[] = '';\n\$outputstack_i++;\n";
+ $code .= _transcompile($ast->sub);
+ $code .= "\$outputstack_i--;\$tmp_even = array_pop(\$outputstack);\n\$outputstack[] .= (is_numeric(\$tmp_even) and (\$tmp_even % 2 == 0)) ? 'yes' : '';\n";
},
"for" => function($ast)
{
+ $code = "";
+ $loopname = "forloop_" . str_replace(".", "_", uniqid("",True));
if(empty($ast->params["start"]))
throw new Exception("Transcompile error: Missing 'start' parameter in <ste:for>. Stop.");
+ $code .= "\$outputstack[] = '';\n\$outputstack_i++;\n";
+ $code .= _transcompile($ast->params["start"]);
+ $code .= "\$outputstack_i--;\n\$${loopname}_start = array_pop(\$outputstack);\n";
+
if(empty($ast->params["end"]))
throw new Exception("Transcompile error: Missing 'end' parameter in <ste:for>. Stop.");
+ $code .= "\$outputstack[] = '';\n\$outputstack_i++;\n";
+ $code .= _transcompile($ast->params["end"]);
+ $code .= "\$outputstack_i--;\n\$${loopname}_end = array_pop(\$outputstack);\n";
+
+ if(empty($ast->params["step"]))
+ $code .= "\$${loopname}_step = 1;\n";
+ else
+ {
+ $code .= "\$outputstack[] = '';\n\$outputstack_i++;\n";
+ $code .= _transcompile($ast->params["step"]);
+ $code .= "\$outputstack_i--;\n\$${loopname}_step = array_pop(\$outputstack);\n";
+ }
+ if(!empty($ast->params["counter"]))
+ {
+ $code .= "\$outputstack[] = '';\n\$outputstack_i++;\n";
+ $code .= _transcompile($ast->params["counter"]);
+ $code .= "\$outputstack_i--;\n\$${loopname}_countername = array_pop(\$outputstack);\n";
+ }
+
+ $loopbody = empty($ast->params["counter"]) ? "\$ste->set_var_by_name(\$${loopname}_countername, \$${loopname}_counter);\n\n" : "";
+ $loopbody .= _transcompile($ast->sub);
+ $loopbody = indent_code("{\n" . indent_code($loopbody) . "}\n");
+
+ $code .= "if(\$${loopname}_step == 0)\n\tthrow new Exception('Runtime Error: step can not be 0 in <ste:for>. Stop.');\n";
+ $code .= "if(\$${loopname}_step > 0)\n{\n";
+ $code .= "\tfor(\$${loopname}_counter = \$${loopname}_start; \$${loopname}_start <= \$${loopname}_end; \$${loopname}_start += \$${loopname}_step)\n";
+ $code .= $loopbody;
+ $code .= "\n}\nelse\n{\n";
+ $code .= "\tfor(\$${loopname}_counter = \$${loopname}_start; \$${loopname}_start >= \$${loopname}_end; \$${loopname}_start += \$${loopname}_step)\n";
+ $code .= $loopbody;
+ $code .= "\n}\n";
+
+ return $code;
},
"foreach" => function($ast)
{
-
+ $loopname = "foreachloop_" . str_replace(".", "_", uniqid("",True));
+ $code = "";
+
+ if(empty($ast->params["array"]))
+ throw new Exception("Transcompile Error: array not givein in <ste:foreach>. Stop.");
+ $code .= "\$outputstack[] = '';\n\$outputstack_i++;\n";
+ $code .= _transcompile($ast->params["array"]);
+ $code .= "\$outputstack_i--;\n\$${loopname}_arrayvar = array_pop(\$outputstack);\n";
+
+ if(empty($ast->params["value"]))
+ throw new Exception("Transcompile Error: value not givein in <ste:foreach>. Stop.");
+ $code .= "\$outputstack[] = '';\n\$outputstack_i++;\n";
+ $code .= _transcompile($ast->params["value"]);
+ $code .= "\$outputstack_i--;\n\$${loopname}_valuevar = array_pop(\$outputstack);\n";
+
+ if(!empty($ast->params["key"]))
+ {
+ $code .= "\$outputstack[] = '';\n\$outputstack_i++;\n";
+ $code .= _transcompile($ast->params["key"]);
+ $code .= "\$outputstack_i--;\n\$${loopname}_keyvar = array_pop(\$outputstack);\n";
+ }
+
+ if(!empty($ast->params["counter"]))
+ {
+ $code .= "\$outputstack[] = '';\n\$outputstack_i++;\n";
+ $code .= _transcompile($ast->params["counter"]);
+ $code .= "\$outputstack_i--;\n\$${loopname}_countervar = array_pop(\$outputstack);\n";
+ }
+
+ $code .= "\$${loopname}_array = \$ste->get_var_by_name(\$${loopname}_arrayvar);\n";
+ $code .= "\$${loopname}_counter = 0;\n";
+
+ $loopbody = "\$${loopname}_counter++;\n\$ste->set_var_by_name(\$${loopname}_valuevar, \$${loopname}_value);\n";
+ if(!empty($ast->params["key"]))
+ $loopbody .= "\$ste->set_var_by_name(\$${loopname}_keyvar, \$${loopname}_key);\n";
+ if(!empty($ast->params["counter"]))
+ $loopbody .= "\$ste->set_var_by_name(\$${loopname}_countervar, \$${loopname}_counter);\n";
+ $loopbody .= "\n";
+ $loopbody .= _transcompile($ast->sub);
+ $loopbody = "{\n" . indent_code($loopbody) . "}\n";
+
+ $code .= "foreach(\$${loopname}_array as \$${loopname}_key => \$${loopname}_value)\n$loopbody\n";
+
+ return $code;
},
"infloop" => function($ast)
{
-
+ return "while(True)\n{\n" . indent_code(_transcompile($ast->sub)) . "}\n";
},
"break" => function($ast)
{
return "break;\n";
- }
+ },
"continue" => function($ast)
{
- return "continue\n";
- }
+ return "continue;\n";
+ },
"block" => function($ast)
{
-
+ if(empty($ast->name))
+ throw new Exception("Transcompile Error: name missing in <ste:block>. Stop.");
+
+ $blknamevar = "blockname_" . str_replace(".", "_", uniqid("", True));
+
+ $code = "\$outputstack[] = '';\n\$outputstack_i++;\n";
+ $code .= _transcompile($ast->name);
+ $code .= "\$outputstack_i--;\n\$${blknamevar} = array_pop(\$outputstack);\n";
+
+ $tmpblk = uniqid("", True);
+ $code .= "\$ste->blocks['$tmpblk'] = array_pop(\$outputstack);\n\$ste->blockorder[] = '$tmpblk';\n\$outputstack = array('');\n\$outputstack_i = 0;\n";
+
+ $code .= _transcompile($ast->sub);
+
+ $code .= "\$ste->blocks[\$${blknamevar}] = array_pop(\$outputstack);\n";
+ $code .= "if(array_search(\$${blknamevar}, \$ste->blockorder) === FALSE)\n\t\$ste->blockorder[] = '$tmpblk';\n\$outputstack = array('');\n\$outputstack_i = 0;\n";
+
+ return $code;
},
"load" => function($ast)
{
-
+ if(empty($ast->params["name"]))
+ throw new Exception("Transcompile Error: name missing in <ste:load>. Stop.");
+
+ $code = "\$outputstack[] = '';\n\$outputstack_i++;\n";
+ $code .= _transcompile($ast->params["name"]);
+ $code .= "\$outputstack_i--;\n\$outputstack[\$outputstack_i] .= \$ste->load(array_pop(\$outputstack));\n";
+
+ return $code;
},
"mktag" => function($ast)
{
-
+ if(empty($ast->params["name"]))
+ throw new Exception("Transcompile Error: name missing in <ste:mktag>. Stop.");
+
+ $code = "\$outputstack[] = '';\n\$outputstack_i++;\n";
+ $code .= _transcompile($ast->params["name"]);
+ $code .= "\$outputstack_i--;\n\$tagname = array_pop(\$outputstack);\n";
+
+ $fxbody = "\$outputstack = array(); \$outputstack_i = 0;\$ste->vars['_tag_parameters'] = \$params;\n";
+
+ if(!empty($ast->params["mandatory"]))
+ {
+ $code .= "\$outputstack[] = '';\n\$outputstack_i++;\n";
+ $code .= _transcompile($ast->params["mandatory"]);
+ $code .= "\$outputstack_i--;\n\$mandatory_params = explode('|', array_pop(\$outputstack));\n";
+
+ $fxbody .= "foreach(\$mandatory_params as \$mp)\n{\n\tif(!isset(\$params[\$mp]))\n\t\tthrow new Exception(\"Runtime Error: \$mp missing in <ste:\$tagname>. Stop.\");\n}";
+ }
+
+ $fxbody .= _transcompile($ast->sub);
+ $fxbody .= "return array_pop(\$outputstack);";
+
+ $code .= "\$tag_fx = function(\$ste, \$params, \$sub) use (\$tagname, \$mandatory_params)\n{\n" . indent_code($fxbody) . "\n}\n";
+ $code .= "\$ste->register_tag(\$tagname, \$tag_fx);";
+
+ return $code;
+ },
+ "tagcontent" => function($ast)
+ {
+ return "\$outputstack[\$outputstack_i] .= \$sub(\$ste);";
},
"set" => function($ast)
{
-
+ if(empty($ast->params["var"]))
+ throw new Exception("Transcompile Error: var missing in <ste:set>. Stop.");
+
+ $code = "\$outputstack[] = '';\n\$outputstack_i++;\n";
+ $code .= _transcompile($ast->params["var"]);
+
+ $code -= "\$outputstack[] = '';\n\$outputstack_i++;\n";
+ $code .= _transcompile($ast->sub);
+
+ $code .= "\$outputstack_i -= 2;\n\$newvartext = array_pop(\$outputstack);\n\$varname = array_pop(\$outputstack);\n";
+ $code .= "\$ste->set_var_by_name(\$varname, \$newvartext);\n";
+
+ return $code;
},
"calc" => function($ast)
{
-
+ $code = "\$outputstack[] = '';\n\$outputstack_i++;\n";
+ $code .= _transcompile($ast->sub);
+ $code .= "\$outputstack_i--;\n\$outputstack[\$outputstack_i] .= \$ste->calc(array_pop(\$outputstack));\n";
+
+ return $code;
}
);
-function transcompile($ast)
+function escape_text($text)
+{
+ return addcslashes($text, "\0.\x1f\r\n\t\\'\x7f..\xff");
+}
+
+function _transcompile($ast) /* The real transcompile function, does not add boilerplate code. */
{
+ $code = "";
+ global $ste_builtins;
+ foreach($ast as $node)
+ {
+ if($node instanceof TextNode)
+ $code .= "\$outputstack[\$outputstack_i] .= '" . escape_text($node->text) . "';\n";
+ else if($node instanceof VariableNode)
+ $code .= "\$outputstack[\$outputstack_i] .= " . $node->transcompile() . ";\n";
+ else if($node instanceof TagNode)
+ {
+ if(isset($ste_builtins[$node->name]))
+ $code .= $ste_builtins[$node->name]($node);
+ else
+ {
+ $paramarray = "parameters_" . str_replace(".", "_", uniqid("", True));
+ $code .= "\$$paramarray = array();\n";
+
+ foreach($node->params as $pname => $pcontent)
+ {
+ $code .= "\$outputstack[] = '';\n\$outputstack_i++;\n";
+ $code .= _transcompile($pcontent);
+ $code .= "\$outputstack_i--;\n\$${paramarray}['" . escape_text($pname) . "'] = array_pop(\$outputstack);\n";
+ }
+
+ $code .= "\$outputstack[\$outputstack_i] .= \$ste->call_tag('" . escape_text($node->name) . "', \$${paramarray}, " . transcompile($node->sub) . ");";
+ }
+ }
+ }
+
+ return $code;
+}
+
+$ste_transc_boilerplate = "\$outputstack = array('');\n\$outputstack_i = 0;\n";
+
+function transcompile($ast) /* Transcompile and add some boilerplate code. */
+{
+ return "function(\$ste)\n{\n" . indent_code($ste_transc_boilerplate . _transcompile($ast) . "return array_pop(\$outputstack);") . "\n}";
+}
+
+class STECore
+{
+ private $tags;
+ private $storage_access;
+ private $cur_tpl_dir;
+ public $blocks;
+ public $blockorder;
+ public $vars;
+
+ public function __construct($storage_access)
+ {
+ $this->storage_access = $storage_access;
+ $this->cur_tpl_dir = "/";
+ STEStandardLibrary->_register_lib($this);
+ $this->vars = array();
+ }
+
+ public function register_tag($name, $callback)
+ {
+ if(!is_callable($callback))
+ throw new Exception("Can not register tag \"$name\", not callable.");
+ if(empty($name))
+ throw new Exception("Can not register tag, empty name.");
+ $this->tags[$name] = $callback;
+ }
+
+ public function call_tag($name, $params, $sub)
+ {
+ if(!isset($this->tags[$name]))
+ throw new Exception("Can not call tag \"$name\": Does not exist.");
+ return $this->tags[$name]($this, $params, $sub);
+ }
+
+ public function calc($expression)
+ {
+ return calc_rpn(shunting_yard($expression));
+ }
+
+ public function exectemplate($tpl)
+ {
+ $output = "";
+ $lastblock = $this->load($tpl);
+
+ foreach($this->blockorder as $blockname)
+ $output .= $this->blocks[$blockname];
+
+ return $output . $lastblock;
+ }
+
+ private function get_var_reference(&$from, $name, $create_if_not_exist)
+ {
+ $bracket_open = strpos($name, "[");
+ if($bracket_open === False)
+ {
+ if(isset($from[$name]) or $create_if_not_exist)
+ return &$from[$name];
+ else
+ return NULL;
+ }
+ else
+ {
+ $old_varname = $varname;
+ $bracket_close = strpos($name, "]", $bracket_open);
+ if($bracket_close === FALSE)
+ throw new Excpeption("Runtime Error: Invalid varname \"$varname\". Missing closing \"]\".");
+ $varname = substr($name, 0, $bracket_open);
+ $name = substr($name, $bracket_open + 1, $bracket_close - $bracket_open - 1) . substr($name, $bracket_close + 1);
+ if(!is_array($from[$varname]))
+ {
+ if($create_if_not_exist)
+ $from[$varname] = array();
+ else
+ return NULL;
+ }
+ try
+ {
+ return $self->get_var_reference($from[$varname], $name, $create_if_not_exist);
+ }
+ catch(Exception $e)
+ {
+ throw new Excpeption("Runtime Error: Invalid varname \"$old_varname\". Missing closing \"]\".");
+ }
+ }
+ }
+
+ public function set_var_by_name($name, $val)
+ {
+ $ref = $this->get_var_reference($this->vars, $name, True);
+ $ref = (string) $val;
+ }
+
+ public function get_var_by_name($name)
+ {
+ $ref = $this->get_var_reference($this->vars, $name, False);
+ return $ref === NULL ? "" : (string) $ref;
+ }
+
+ public function load($tpl, $quiet=False)
+ {
+ $tpldir_b4 = $this->cur_tpl_dir;
+
+ /* Resolve ".", ".." and protect from possible LFI */
+ $tpl = str_replace("\\", "/", $tpl);
+ if($tpl[0] != "/")
+ $tpl = $this->cur_tpl_dir . "/" . $tpl;
+ $pathex = array_filter(array_slice(explode("/", $tpl), 1), function($s) { return $s != "."; });
+ while(($i = array_search("..", $pathex)) !== False)
+ {
+ if($i == 0)
+ $pathex = array_slice($pathex, 1);
+ else
+ $pathex = array_merge(array_slice($pathex, 0, $i), array_slice($pathex, $i + 2));
+ }
+ $tpl = implode("/", $pathex);
+
+ if($quiet)
+ {
+ $blocks_back = clone $this->blocks;
+ $blockorder_back = clone $this->blockorder;
+ }
+
+ $mode = MODE_TRANSCOMPILED;
+ $content = $this->storage_access->load($tpl, $mode);
+ if($mode == MODE_SOURCE)
+ {
+ $ast = parse($content);
+ $transc = transcompile($ast);
+ $this->storage_access->save($tpl, $transc, MODE_TRANSCOMPILED);
+ eval("\$content = $transc;");
+ }
+
+ $output = $content($ste);
+
+ $this->cur_tpl_dir = $tpldir_b4;
+
+ if($quiet)
+ {
+ $this->blocks = $blocks_back;
+ $this->blockorder = $blockorder_back;
+ }
+ else
+ return $output;
+ }
+}
+
+class STEStandardLibrary
+{
+ static public function _register_lib($ste)
+ {
+ foreach(get_class_methods(__CLASS__) as $method)
+ if($method[0] != "_")
+ $ste->register_tag($method, array(__CLASS__, $method));
+ }
+
+ static public function escape($ste, $params, $sub)
+ {
+ return htmlentities($sub($ste), ENT_QUOTES, "UTF-8");
+ }
+
+ static public function strlen($ste, $params, $sub)
+ {
+ return strlen($sub($ste));
+ }
+
+ static public function array_len($ste, $params, $sub)
+ {
+ if(empty($params["var"]))
+ throw new Exception("Runtime Error: missing var parameter in <ste:array_len>.");
+ $a = $ste->get_var_by_name($params["var"]);
+ return (is_array($a)) ? count($a) : "";
+ }
}
?>