diff options
Diffstat (limited to 'transform.php')
| -rw-r--r-- | transform.php | 996 |
1 files changed, 0 insertions, 996 deletions
diff --git a/transform.php b/transform.php deleted file mode 100644 index bd6efea..0000000 --- a/transform.php +++ /dev/null @@ -1,996 +0,0 @@ -<?php - -namespace ste; - -class TextNode -{ - public $text; -} - -class TagNode -{ - public $name; - public $params; - public $sub; -} - -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; - } -} - -/* $text must start after the first opening bracket */ -function find_closing_bracket($text, $opening, $closing) -{ - $counter = 1; - $len = strlen($text); - for($i = 0; $i < $len; ++$i) - { - switch($text[$i]) - { - case $opening: - ++$counter; - break; - case $closing: - --$counter; - break; - } - if($counter == 0) - break; - } - - if($counter > 0) - throw new \Exception("Missing closing \"$closing\". Stop."); - - return $i; -} - -function unescape_text($text) -{ - $text = preg_replace("/(?:(?<!\\\\)\\\\\\\$)/s", "$", $text); - return str_replace("\\\\", "\\", $text); -} - -function tokenize_text($text) -{ - $tokens = array(); - /* Find next non-escaped $-char */ - if(preg_match("/(?:(?<!\\\\)\\$)/s", $text, $match, PREG_OFFSET_CAPTURE) == 0) - { - $node = new TextNode(); - $node->text = unescape_text($text); - return (strlen($node->text) == 0) ? array() : array($node); - } - - if($match[0][1] > 0) - { - $node = new TextNode(); - $node->text = unescape_text(substr($text, 0, $match[0][1])); - $tokens[] = $node; - } - - if($text[$match[0][1] + 1] == "{") - { - $varend = find_closing_bracket(substr($text, $match[0][1] + 2), "{", "}") + $match[0][1] + 2; - return array_merge( - $tokens, - tokenize_text("\$" . substr($text, $match[0][1] + 2, ($varend - 1) - ($match[0][1] + 1))), - tokenize_text(substr($text, $varend + 1)) - ); - } - - $text = substr($text, $match[0][1] + 1); - if(preg_match("/^[a-zA-Z0-9_]+/s", $text, $match, PREG_OFFSET_CAPTURE) == 0) - { - $nexttokens = tokenize_text($text); - if($nexttokens[0] instanceof Text) - $nexttokens[0]->text = "\$" . $nexttokens[0]->text; - else - { - $node = new TextNode(); - $node->text = "\$"; - $tokens[] = $node; - } - return array_merge($tokens, $nexttokens); - } - - $node = new VariableNode(); - $node->name = $match[0][0]; - $node->arrayfields = array(); - - $text = substr($text, $match[0][1] + strlen($match[0][0])); - while(@$text[0] == "[") - { - $text = substr($text, 1); - $fieldend = find_closing_bracket($text, "[", "]"); - $node->arrayfields[] = tokenize_text(substr($text, 0, $fieldend)); - $text = substr($text, $fieldend + 1); - } - - $tokens[] = $node; - - return strlen($text) > 0 ? array_merge($tokens, tokenize_text($text)) : $tokens; -} - -function mk_ast($code) -{ - $ast = array(); - - if(preg_match("/\\<\\s*ste:([a-zA-Z0-9_]*)/s", $code, $matches, PREG_OFFSET_CAPTURE) == 0) - return tokenize_text($code); - - $ast = tokenize_text(substr($code, 0, $matches[0][1])); - - $tag = new TagNode(); - $tag->name = $matches[1][0]; - - $code = substr($code, $matches[0][1] + strlen($matches[0][0])); - - $tag->params = array(); - - while(preg_match("/^\\s+([a-zA-Z0-9_]+)=((?:\"(?:.*?)(?<!\\\\)\")|(?:'(?:.*?)(?<!\\\\)'))/s", $code, $matches, PREG_OFFSET_CAPTURE) > 0) - { - $paramval = substr($code, $matches[2][1] + 1, strlen($matches[2][0]) - 2); - $paramval = str_replace("\\\"", "\"", $paramval); - $paramval = str_replace("\\'", "'", $paramval); - $tag->params[$matches[1][0]] = tokenize_text($paramval); - $code = substr($code, strlen($matches[0][0])); - } - - if(preg_match("/^\\s*([\\/]?)\\s*\\>/s", $code, $matches) == 0) - throw new \Exception("Missing closing '>' in \"" . $tag->name . "\"-Tag. Stop. (:::CODE START:::$code:::CODE END:::)"); - - $code = substr($code, strlen($matches[0])); - - $tag->sub = array(); - - if($matches[1][0] != "/") - { - $tags_open = 1; - $off = 0; - $last_tag_start = 0; - while(preg_match("/\\<((?:\\s*)|(?:\\s*\\/\\s*))ste:([a-zA-Z0-9_]*)(?:\\s+(?:[a-zA-Z0-9_]+)=(?:(?:\"(?:.*?)(?<!\\\\)\")|(?:'(?:.*?)(?<!\\\\)')))*((?:\\s*)|(?:\\s*\\/\\s*))\\>/s", $code, $matches, PREG_OFFSET_CAPTURE, $off) > 0) /* RegEx from hell! Matches all <ste:> Tags. Opening, closing and self-closing ones. */ - { - if(trim($matches[3][0]) != "/") - { - $closingtag = trim($matches[1][0]); - if($closingtag[0] == "/") - $tags_open--; - else - $tags_open++; - } - $last_tag_start = $matches[0][1]; - $off = $last_tag_start + strlen($matches[0][0]); - if($tags_open == 0) - break; - } - - if(($tags_open != 0) or ($tag->name != $matches[2][0])) - throw new \Exception("Missing closing \"ste:" . $tag->name . "\"-Tag. Stop."); - - if($tag->name == "rawtext") - { - $tag = new TextNode(); - $tag->text = substr($code, 0, $last_tag_start); - } - else - $tag->sub = mk_ast(substr($code, 0, $last_tag_start)); - $code = substr($code, $off); - } - - $ast[] = $tag; - return array_merge($ast, strlen($code) > 0 ? mk_ast($code) : array()); -} - -function parse($code) -{ - /* Precompiling... */ - $code = preg_replace("/\\<\\s*ste:comment\\s*\\>.*?\\<\\s*\\/\\s*ste:comment\\s*\\>/s", "", $code); /* Remove comments */ - $code = preg_replace( /* Transform short form of if-clause (?{cond|then|else}) to long form */ - "/(?:(?<!\\\\)\\?)(?:(?<!\\\\)\\{)(.*?)(?:(?<!\\\\)\\|)(.*?)(?:(?<!\\\\)\\|)(.*?)(?:(?<!\\\\)\\})/s", - "<ste:if>\$1<ste:then>\$2</ste:then><ste:else>\$3</ste:else></ste:if>", - $code - ); - /* Unescape \? \{ \} \| */ - $code = preg_replace("/(?:(?<!\\\\)\\\\\\?)/s", "?", $code); - $code = preg_replace("/(?:(?<!\\\\)\\\\\\{)/s", "{", $code); - $code = preg_replace("/(?:(?<!\\\\)\\\\\\})/s", "}", $code); - $code = preg_replace("/(?:(?<!\\\\)\\\\\\|)/s", "|", $code); - - /* Create abstract syntax tree */ - return mk_ast($code); -} - -define("MODE_SOURCE", 0); -define("MODE_TRANSCOMPILED", 1); - -interface StorageAccess -{ - public function load($tpl, &$mode); - public function save($tpl, $data, $mode); -} - -class FilesystemStorageAccess implements StorageAccess -{ - protected $sourcedir; - protected $transcompileddir; - - public function __construct($src, $transc) - { - $this->sourcedir = $src; - $this->transcompileddir = $transc; - } - - public function load($tpl, &$mode) - { - $src_fn = $this->sourcedir . "/" . $tpl; - $transc_fn = $this->transcompileddir . "/" . $tpl . ".php"; - - if($mode == MODE_SOURCE) - { - $content = @file_get_contents($src_fn); - if($content === False) - throw new \Exception("Template not found."); - return $content; - } - - $src_stat = @stat($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) - { - $mode = MODE_SOURCE; - return file_get_contents($src_fn); - } - else if($src_stat === False) - { - include($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 $transcompile_fx; - } - } - } - - public function save($tpl, $data, $mode) - { - $fn = (($mode == MODE_SOURCE) ? $this->sourcedir : $this->transcompileddir) . "/" . $tpl . (($mode == MODE_TRANSCOMPILED) ? ".php" : ""); - @mkdir(dirname($fn), 0777, True); - file_put_contents($fn, "<?php \$transcompile_fx = $data; ?>"); - chmod($fn, 0777); /* FIXME: Remove this line after debugging... */ - } -} - -function indent_code($code) -{ - return implode( - "\n", - array_map( - function($line) { return "\t$line"; }, - explode("\n", $code) - ) - ); -} - -/* We could also just eval() the $infix_math code, but this is much cooler :-D (Parser inception) */ -function shunting_yard($infix_math) -{ - $operators = 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 ($x === "0") or (!empty($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); -} - -function loopbody($code) -{ - return "try\n{\n" . indent_code($code) . "\n}\ncatch(\ste\BreakException \$e) { break; }\ncatch(\ste\ContinueException \$e) { continue; }\n"; -} - -$ste_builtins = array( - "if" => function($ast) - { - $output = ""; - $condition = array(); - $then = array(); - $else = array(); - - foreach($ast->sub as $node) - { - if(($node instanceof TagNode) and ($node->name == "then")) - $then = $node->sub; - else if(($node instanceof TagNode) and ($node->name == "else")) - $else = $node->sub; - else - $condition[] = $node; - } - - if(empty($then)) - throw new \Exception("Transcompile error: Missing <ste:else> in <ste:if>. Stop."); - - $output .= "\$outputstack[] = \"\";\n\$outputstack_i++;\n"; - $output .= _transcompile($condition); - $output .= "\$outputstack_i--;\nif(\$ste->evalbool(array_pop(\$outputstack)))\n{\n"; - $output .= indent_code(_transcompile($then)); - $output .= "\n}\n"; - if(!empty($else)) - { - $output .= "else\n{\n"; - $output .= indent_code(_transcompile($else)); - $output .= "\n}\n"; - } - return $output; - }, - "cmp" => function($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->evalbool(array_pop(\$outputstack))) ? 'yes' : '';\n"; - return $code; - }, - "even" => function($ast) - { - $code = "\$outputstack[] = '';\n\$outputstack_i++;\n"; - $code .= _transcompile($ast->sub); - $code .= "\$outputstack_i--;\n\$tmp_even = array_pop(\$outputstack);\n\$outputstack[\$outputstack_i] .= (is_numeric(\$tmp_even) and (\$tmp_even % 2 == 0)) ? 'yes' : '';\n"; - return $code; - }, - "for" => function($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["stop"])) - throw new \Exception("Transcompile error: Missing 'end' parameter in <ste:for>. Stop."); - $code .= "\$outputstack[] = '';\n\$outputstack_i++;\n"; - $code .= _transcompile($ast->params["stop"]); - $code .= "\$outputstack_i--;\n\$${loopname}_stop = 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"; - $loopbody .= _transcompile($ast->sub); - $loopbody = indent_code("{\n" . loopbody(indent_code($loopbody)) . "\n}\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}_counter <= \$${loopname}_stop; \$${loopname}_counter += \$${loopname}_step)\n"; - $code .= $loopbody; - $code .= "\n}\nelse\n{\n"; - $code .= "\tfor(\$${loopname}_counter = \$${loopname}_start; \$${loopname}_counter >= \$${loopname}_stop; \$${loopname}_counter += \$${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"; - $code .= "if(!is_array(\$${loopname}_array))\n\t\$${loopname}_array = array();\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); - $loopbody = "{\n" . loopbody(indent_code($loopbody)) . "\n}\n"; - - $code .= "foreach(\$${loopname}_array as \$${loopname}_key => \$${loopname}_value)\n$loopbody\n"; - - return $code; - }, - "infloop" => function($ast) - { - return "while(True)\n{\n" . loopbody(indent_code(_transcompile($ast->sub)) . "\n}") . "\n"; - }, - "break" => function($ast) - { - return "\$ste->break_loop();\n"; - }, - "continue" => function($ast) - { - return "\$ste->continue_loop();\n"; - }, - "block" => function($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->params["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[] = \$${blknamevar};\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);\n"; - - 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 $code; - } -); - -function escape_text($text) -{ - return addcslashes($text, "\r\n\t\$\0..\x1f\\'\x7f..\xff"); -} - -function _transcompile($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) . ");\n"; - } - } - } - - return $code; -} - -$ste_transc_boilerplate = "\$outputstack = array('');\n\$outputstack_i = 0;\n"; - -function transcompile($ast) /* Transcompile and add some boilerplate code. */ -{ - global $ste_transc_boilerplate; - return "function(\$ste)\n{\n" . indent_code($ste_transc_boilerplate . _transcompile($ast) . "return array_pop(\$outputstack);") . "\n}"; -} - -class BreakException extends \Exception { } -class ContinueException extends \Exception { } - -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(); - $this->blockorder = array(); - $this->blocks = array(); - } - - public function register_tag($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 call_user_func($this->tags[$name], $this, $params, $sub); - } - - public function break_loop() - { - throw new BreakException(); - } - - public function continue_loop() - { - throw new ContinueException(); - } - - public function calc($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) - { - $ref = &$from[$name]; - return $ref; - } - 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 - { - $ref = &$self->get_var_reference($from[$varname], $name, $create_if_not_exist); - return $ref; - } - 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 = $val; - } - - public function get_var_by_name($name) - { - $ref = $this->get_var_reference($this->vars, $name, False); - return $ref === NULL ? "" : $ref; - } - - public function load($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 ($s != ".") and (!empty($s)); }); - $pathex = array_merge($pathex); - 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 = $content($this); - - $this->cur_tpl_dir = $tpldir_b4; - - if($quiet) - { - $this->blocks = $blocks_back; - $this->blockorder = $blockorder_back; - } - else - return $output; - } - - public function evalbool($txt) - { - return trim($txt) != ""; - } -} - -class STEStandardLibrary -{ - static public function _register_lib($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) : ""; - } -} - -?> |