diff options
Diffstat (limited to 'Transcompiler.php')
| -rw-r--r-- | Transcompiler.php | 453 |
1 files changed, 0 insertions, 453 deletions
diff --git a/Transcompiler.php b/Transcompiler.php deleted file mode 100644 index 8f3213b..0000000 --- a/Transcompiler.php +++ /dev/null @@ -1,453 +0,0 @@ -<?php - -namespace kch42\ste; - -/* - * Class: Transcompiler - * Contains the STE transcompiler. You'll only need this, if you want to manually transcompile a STE template. - */ -class Transcompiler { - private static $builtins = NULL; - - public static function tempvar($typ) { - return $typ . '_' . str_replace('.', '_', uniqid('', true)); - } - - public static function init_builtins() { - if(self::$builtins !== NULL) { - return; - } - - self::$builtins = array( - "if" => function($ast) { - $output = ""; - $condition = array(); - $then = NULL; - $else = NULL; - - foreach($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[] = $node; - } - } - - if($then === NULL) { - throw new ParseCompileError("self::Transcompile error: Missing <ste:then> in <ste:if>.", $ast->tpl, $ast->offset); - } - - $output .= "\$outputstack[] = \"\";\n\$outputstack_i++;\n"; - $output .= self::_transcompile($condition); - $output .= "\$outputstack_i--;\nif(\$ste->evalbool(array_pop(\$outputstack)))\n{\n"; - $output .= self::indent_code(self::_transcompile($then)); - $output .= "\n}\n"; - if($else !== NULL) { - $output .= "else\n{\n"; - $output .= self::indent_code(self::_transcompile($else)); - $output .= "\n}\n"; - } - return $output; - }, - "cmp" => function($ast) { - $operators = array( - array('eq', '=='), - array('neq', '!='), - array('lt', '<'), - array('lte', '<='), - array('gt', '>'), - array('gte', '>=') - ); - - $code = ""; - - if(isset($ast->params["var_b"])) { - list($val, $pre) = self::_transcompile($ast->params["var_b"], true); - $code .= $pre; - $b = '$ste->get_var_by_name(' . $val . ')'; - } else if(isset($ast->params["text_b"])) { - list($b, $pre) = self::_transcompile($ast->params["text_b"], true); - $code .= $pre; - } else { - throw new ParseCompileError("self::Transcompile error: neiter var_b nor text_b set in <ste:cmp>.", $ast->tpl, $ast->offset); - } - - if(isset($ast->params["var_a"])) { - list($val, $pre) = self::_transcompile($ast->params["var_a"], true); - $code .= $pre; - $a = '$ste->get_var_by_name(' . $val . ')'; - } else if(isset($ast->params["text_a"])) { - list($a, $pre) = self::_transcompile($ast->params["text_a"], true); - $code .= $pre; - } else { - throw new ParseCompileError("self::Transcompile error: neiter var_a nor text_a set in <ste:cmp>.", $ast->tpl, $ast->offset); - } - - if(!isset($ast->params["op"])) { - throw new ParseCompileError("self::Transcompile error: op not given in <ste:cmp>.", $ast->tpl, $ast->offset); - } - if((count($ast->params["op"]) == 1) and ($ast->params["op"][0] instanceof TextNode)) { - /* Operator is known at compile time, this saves *a lot* of output code! */ - $op = trim($ast->params["op"][0]->text); - $op_php = NULL; - foreach($operators as $v) { - if($v[0] == $op) { - $op_php = $v[1]; - break; - } - } - if($op_php === NULL) { - throw new ParseCompileError("self::Transcompile Error: Unknown operator in <ste:cmp>", $ast->tpl, $ast->offset); - } - $code .= "\$outputstack[\$outputstack_i] .= (($a) $op_php ($b)) ? 'yes' : '';\n"; - } else { - list($val, $pre) = self::_transcompile($ast->params["op"], true); - $code .= $pre . "switch(trim(" . $val . "))\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"; - }, $operators - )); - $code .= "default: throw new \\kch42\\ste\\RuntimeError('Unknown operator in <ste:cmp>.');\n}\n"; - } - return $code; - }, - "not" => function($ast) { - $code = "\$outputstack[] = '';\n\$outputstack_i++;\n"; - $code .= self::_transcompile($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"; - $code .= self::_transcompile($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 = ""; - $loopname = self::tempvar("forloop"); - if(empty($ast->params["start"])) { - throw new ParseCompileError("self::Transcompile error: Missing 'start' parameter in <ste:for>.", $ast->tpl, $ast->offset); - } - list($val, $pre) = self::_transcompile($ast->params["start"], true); - $code .= $pre; - $code .= "\$${loopname}_start = " . $val . ";\n"; - - if(empty($ast->params["stop"])) { - throw new ParseCompileError("self::Transcompile error: Missing 'end' parameter in <ste:for>.", $ast->tpl, $ast->offset); - } - list($val, $pre) = self::_transcompile($ast->params["stop"], true); - $code .= $pre; - $code .= "\$${loopname}_stop = " . $val . ";\n"; - - $step = NULL; /* i.e. not known at compilation time */ - if(empty($ast->params["step"])) { - $step = 1; - } else if((count($ast->params["step"]) == 1) and ($ast->params["step"][0] instanceof TextNode)) { - $step = $ast->params["step"][0]->text + 0; - } else { - list($val, $pre) = self::_transcompile($ast->params["step"], true); - $code .= $pre; - $code .= "\$${loopname}_step = " . $val . ";\n"; - } - - if(!empty($ast->params["counter"])) { - list($val, $pre) = self::_transcompile($ast->params["counter"], true); - $code .= $pre; - $code .= "\$${loopname}_countername = " . $val . ";\n"; - } - - $loopbody = empty($ast->params["counter"]) ? "" : "\$ste->set_var_by_name(\$${loopname}_countername, \$${loopname}_counter);\n"; - $loopbody .= self::_transcompile($ast->sub); - $loopbody = self::indent_code("{\n" . self::loopbody(self::indent_code($loopbody)) . "\n}\n"); - - if($step === NULL) { - $code .= "if(\$${loopname}_step == 0)\n\tthrow new \\kch42\\ste\\RuntimeError('step can not be 0 in <ste:for>.');\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; - $code .= "\n}\n"; - } else if($step == 0) { - throw new ParseCompileError("self::Transcompile Error: step can not be 0 in <ste:for>.", $ast->tpl, $ast->offset); - } else if($step > 0) { - $code .= "for(\$${loopname}_counter = \$${loopname}_start; \$${loopname}_counter <= \$${loopname}_stop; \$${loopname}_counter += $step)\n$loopbody\n"; - } else { - $code .= "for(\$${loopname}_counter = \$${loopname}_start; \$${loopname}_counter >= \$${loopname}_stop; \$${loopname}_counter += $step)\n$loopbody\n"; - } - - return $code; - }, - "foreach" => function($ast) { - $loopname = self::tempvar("foreachloop"); - $code = ""; - - if(empty($ast->params["array"])) { - throw new ParseCompileError("self::Transcompile Error: array not given in <ste:foreach>.", $ast->tpl, $ast->offset); - } - list($val, $pre) = self::_transcompile($ast->params["array"], true); - $code .= $pre; - $code .= "\$${loopname}_arrayvar = " . $val . ";\n"; - - if(empty($ast->params["value"])) { - throw new ParseCompileError("self::Transcompile Error: value not given in <ste:foreach>.", $ast->tpl, $ast->offset); - } - list($val, $pre) = self::_transcompile($ast->params["value"], true); - $code .= $pre; - $code .= "\$${loopname}_valuevar = " . $val . ";\n"; - - if(!empty($ast->params["key"])) { - list($val, $pre) = self::_transcompile($ast->params["key"], true); - $code .= $pre; - $code .= "\$${loopname}_keyvar = " . $val . ";\n"; - } - - if(!empty($ast->params["counter"])) { - list($val, $pre) = self::_transcompile($ast->params["counter"], true); - $code .= $pre; - $code .= "\$${loopname}_countervar = " . $val . ";\n"; - } - - $loopbody = ""; - $code .= "\$${loopname}_array = \$ste->get_var_by_name(\$${loopname}_arrayvar);\n"; - $code .= "if(!is_array(\$${loopname}_array))\n\t\$${loopname}_array = array();\n"; - if(!empty($ast->params["counter"])) { - $code .= "\$${loopname}_counter = -1;\n"; - $loopbody .= "\$${loopname}_counter++;\n\$ste->set_var_by_name(\$${loopname}_countervar, \$${loopname}_counter);\n"; - } - - $loop = array(); - $else = array(); - foreach($ast->sub as $node) { - if(($node instanceof TagNode) && ($node->name == "else")) { - $else = array_merge($else, $node->sub); - } else { - $loop[] = $node; - } - } - - $loopbody .= "\$ste->set_var_by_name(\$${loopname}_valuevar, \$${loopname}_value);\n"; - if(!empty($ast->params["key"])) { - $loopbody .= "\$ste->set_var_by_name(\$${loopname}_keyvar, \$${loopname}_key);\n"; - } - $loopbody .= "\n"; - $loopbody .= self::_transcompile($loop); - $loopbody = "{\n" . self::loopbody(self::indent_code($loopbody)) . "\n}\n"; - - if(!empty($else)) { - $code .= "if(empty(\$${loopname}_array))\n{\n"; - $code .= self::indent_code(self::_transcompile($else)); - $code .= "\n}\nelse "; - } - $code .= "foreach(\$${loopname}_array as \$${loopname}_key => \$${loopname}_value)\n$loopbody\n"; - - return $code; - }, - "infloop" => function($ast) { - return "while(true)\n{\n" . self::indent_code(self::loopbody(self::indent_code(self::_transcompile($ast->sub)))) . "\n}\n"; - }, - "break" => function($ast) { - return "throw new \\kch42\\ste\\BreakException();\n"; - }, - "continue" => function($ast) { - return "throw new \\kch42\\ste\\ContinueException();\n"; - }, - "block" => function($ast) { - if(empty($ast->params["name"])) { - throw new ParseCompileError("self::Transcompile Error: name missing in <ste:block>.", $ast->tpl, $ast->offset); - } - - $blknamevar = self::tempvar("blockname"); - - list($val, $code) = self::_transcompile($ast->params["name"], true); - $code .= "\$${blknamevar} = " . $val . ";\n"; - - $tmpblk = uniqid("", true); - $code .= "\$ste->blocks['$tmpblk'] = array_pop(\$outputstack);\n\$ste->blockorder[] = '$tmpblk';\n\$outputstack = array('');\n\$outputstack_i = 0;\n"; - - $code .= self::_transcompile($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 ParseCompileError("self::Transcompile Error: name missing in <ste:load>.", $ast->tpl, $ast->offset); - } - - list($val, $code) = self::_transcompile($ast->params["name"], true); - $code .= "\$outputstack[\$outputstack_i] .= \$ste->load(" . $val . ");\n"; - return $code; - }, - "mktag" => function($ast) { - $code = ""; - - if(empty($ast->params["name"])) { - throw new ParseCompileError("self::Transcompile Error: name missing in <ste:mktag>.", $ast->tpl, $ast->offset); - } - - $fxbody = "\$outputstack = array(''); \$outputstack_i = 0;\$ste->set_local_var('_tag_parameters', \$params);\n"; - - list($tagname, $tagname_pre) = self::_transcompile($ast->params["name"], true); - - $usemandatory = ""; - if(!empty($ast->params["mandatory"])) { - $usemandatory = " use (\$mandatory_params)"; - $code .= "\$outputstack[] = '';\n\$outputstack_i++;\n"; - $code .= self::_transcompile($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 \\kch42\\ste\\RuntimeError(\"\$mp missing in <ste:\" . $tagname . \">.\");\n}"; - } - - $fxbody .= self::_transcompile($ast->sub); - $fxbody .= "return array_pop(\$outputstack);"; - - $code .= "\$tag_fx = \$ste->make_closure(function(\$ste, \$params, \$sub)" . $usemandatory . "\n{\n" . self::indent_code($fxbody) . "\n});\n"; - $code .= $tagname_pre; - $code .= "\$ste->register_tag($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 ParseCompileError("self::Transcompile Error: var missing in <ste:set>.", $ast->tpl, $ast->offset); - } - - $code = "\$outputstack[] = '';\n\$outputstack_i++;\n"; - $code .= self::_transcompile($ast->sub); - $code .= "\$outputstack_i--;\n"; - - list($val, $pre) = self::_transcompile($ast->params["var"], true); - $code .= $pre; - $code .= "\$ste->set_var_by_name(" . $val . ", array_pop(\$outputstack));\n"; - - return $code; - }, - "setlocal" => function($ast) { - if(empty($ast->params["var"])) { - throw new ParseCompileError("self::Transcompile Error: var missing in <ste:set>.", $ast->tpl, $ast->offset); - } - - $code = "\$outputstack[] = '';\n\$outputstack_i++;\n"; - $code .= self::_transcompile($ast->sub); - $code .= "\$outputstack_i--;\n"; - - list($val, $pre) = self::_transcompile($ast->params["var"], true); - $code .= $pre; - $code .= "\$ste->set_local_var(" . $val . ", array_pop(\$outputstack));\n"; - - return $code; - }, - "get" => function($ast) { - if(empty($ast->params["var"])) { - throw new ParseCompileError("self::Transcompile Error: var missing in <ste:get>.", $ast->tpl, $ast->offset); - } - - list($val, $pre) = self::_transcompile($ast->params["var"], true); - return "$pre\$outputstack[\$outputstack_i] .= \$ste->get_var_by_name(" . $val . ");"; - }, - "calc" => function($ast) { - $code = "\$outputstack[] = '';\n\$outputstack_i++;\n"; - $code .= self::_transcompile($ast->sub); - $code .= "\$outputstack_i--;\n\$outputstack[\$outputstack_i] .= \$ste->calc(array_pop(\$outputstack));\n"; - - return $code; - } - ); - } - - private static function indent_code($code) { - return implode( - "\n", - array_map(function($line) { return "\t$line"; }, explode("\n", $code)) - ); - } - - private static function loopbody($code) { - return "try\n{\n" . self::indent_code($code) . "\n}\ncatch(\\kch42\\ste\\BreakException \$e) { break; }\ncatch(\\kch42\\ste\\ContinueException \$e) { continue; }\n"; - } - - private static function _transcompile($ast, $avoid_outputstack = false) { /* The real self::transcompile function, does not add boilerplate code. */ - $code = ""; - - $text_and_var_buffer = array(); - - foreach($ast as $node) { - if($node instanceof TextNode) { - $text_and_var_buffer[] = '"' . Misc::escape_text($node->text) . '"'; - } else if($node instanceof VariableNode) { - $text_and_var_buffer[] = $node->transcompile(); - } else if($node instanceof TagNode) { - if(!empty($text_and_var_buffer)) { - $code .= "\$outputstack[\$outputstack_i] .= " . implode (" . ", $text_and_var_buffer) . ";\n"; - $text_and_var_buffer = array(); - } - if(isset(self::$builtins[$node->name])) { - /* PHP's parser fails once again... Apparently we cannot call a function from an array that is a static property */ - $func = self::$builtins[$node->name]; - $code .= $func($node); - } else { - $paramarray = self::tempvar("parameters"); - $code .= "\$$paramarray = array();\n"; - - foreach($node->params as $pname => $pcontent) { - list($pval, $pre) = self::_transcompile($pcontent, true); - $code .= $pre . "\$${paramarray}['" . Misc::escape_text($pname) . "'] = " . $pval . ";\n"; - } - - $code .= "\$outputstack[\$outputstack_i] .= \$ste->call_tag('" . Misc::escape_text($node->name) . "', \$${paramarray}, "; - $code .= empty($node->sub) ? "function(\$ste) { return ''; }" : ("\$ste->make_closure(" . self::transcompile($node->sub) . ")"); - $code .= ");\n"; - } - } - } - - if($avoid_outputstack && ($code == "")) { - return array(implode (" . ", $text_and_var_buffer), ""); - } - - if(!empty($text_and_var_buffer)) { - $code .= "\$outputstack[\$outputstack_i] .= ". implode (" . ", $text_and_var_buffer) . ";\n"; - } - - if($avoid_outputstack) { - $tmpvar = self::tempvar("tmp"); - $code = "\$outputstack[] = '';\n\$outputstack_i++;" . $code; - $code .= "\$$tmpvar = array_pop(\$outputstack);\n\$outputstack_i--;\n"; - return array("\$$tmpvar", $code); - } - - return $code; - } - - /* - * Function: transcompile - * Transcompiles an abstract syntax tree to PHP. - * You only need this function, if you want to manually transcompile a template. - * - * Parameters: - * $ast - The abstract syntax tree to transcompile. - * - * Returns: - * PHP code. The PHP code is an anonymous function expecting a <STECore> instance as its parameter and returns a string (everything that was not pached into a section). - */ - public static function transcompile($ast) { /* self::Transcompile and add some boilerplate code. */ - $boilerplate = "\$outputstack = array('');\n\$outputstack_i = 0;\n"; - return "function(\$ste)\n{\n" . self::indent_code($boilerplate . self::_transcompile($ast) . "return array_pop(\$outputstack);") . "\n}"; - } -} - -Transcompiler::init_builtins(); |