diff options
Diffstat (limited to 'stupid_template_engine.php')
| -rw-r--r-- | stupid_template_engine.php | 563 |
1 files changed, 346 insertions, 217 deletions
diff --git a/stupid_template_engine.php b/stupid_template_engine.php index 7153a99..bef1fac 100644 --- a/stupid_template_engine.php +++ b/stupid_template_engine.php @@ -29,6 +29,10 @@ abstract class ASTNode class TextNode extends ASTNode { public $text; + public function __construct($tpl, $off, $text = "") { + parent::__construct($tpl, $off); + $this->text = $text; + } } class TagNode extends ASTNode @@ -102,255 +106,380 @@ class RuntimeError extends \Exception {} */ class FatalRuntimeError extends \Exception {} -/* $text must start after the first opening bracket */ -function find_closing_bracket($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; - } +class Parser { + private $text; + private $name; + private $off; + private $len; - if($counter > 0) - throw new \Exception("Missing closing \"$closing\". Stop."); - - return $i; -} - -function instance_in_array($classname, $a) -{ - foreach($a as $v) - { - if($v instanceof $classname) - return True; - } - return False; -} - -function unescape_text($text) -{ - return stripcslashes($text); -} - -function tokenize_text($text, $tpl, $off) -{ - $tokens = array(); - /* Find next non-escaped $-char */ - if(preg_match("/(?:(?<!\\\\)\\$)/s", $text, $match, PREG_OFFSET_CAPTURE) == 0) - { - $node = new TextNode($tpl, $off); - $node->text = preg_replace("/^(?:\\n|\\r\\n|\\r)\\s*/s", "", unescape_text($text)); - return (strlen($node->text) == 0) ? array() : array($node); - } + const PARSE_SHORT = 1; + const PARSE_TAG = 2; - if($match[0][1] > 0) - { - $node = new TextNode($tpl, $off); - $node->text = unescape_text(substr($text, 0, $match[0][1])); - $tokens[] = $node; - } + const ESCAPES_DEFAULT = '$?~{}|\\'; - if($text[$match[0][1] + 1] == "{") - { - try - { - $varend = find_closing_bracket(substr($text, $match[0][1] + 2), "{", "}") + $match[0][1] + 2; - } - catch(\Exception $e) - { - throw new ParseCompileError("Parse Error: Missing closing '}'", $tpl, $off + $match[0][1] + 1); - } - return array_merge( - $tokens, - tokenize_text("\$" . substr($text, $match[0][1] + 2, ($varend - 1) - ($match[0][1] + 1)), $tpl, $off + $match[0][1] + 2), - tokenize_text(substr($text, $varend + 1), $tpl, $off + $varend + 1) - ); + private function __construct($text, $name) { + $this->text = $text; + $this->name = $name; + $this->off = 0; + $this->len = mb_strlen($text); } - $text = substr($text, $match[0][1] + 1); - $off += $match[0][1] + 1; - if(preg_match("/^[a-zA-Z0-9_]+/s", $text, $match, PREG_OFFSET_CAPTURE) == 0) - { - $nexttokens = tokenize_text($text, $tpl, $off); - if($nexttokens[0] instanceof TextNode) - $nexttokens[0]->text = "\$" . $nexttokens[0]->text; - else - { - $node = new TextNode($tpl, $off); - $node->text = "\$"; - $tokens[] = $node; + private function next($n = 1) { + if($n <= 0) { + throw new \InvalidArgumentException("\$n must be > 0"); } - return array_merge($tokens, $nexttokens); + $c = mb_substr($this->text, $this->off, $n); + $this->off = max($this->off + $n, $this->len); + return $c; } - $node = new VariableNode($tpl, $off + $match[0][1]); - $node->name = $match[0][0]; - $node->arrayfields = array(); - $text = substr($text, $match[0][1] + strlen($match[0][0])); - $off += $match[0][1] + strlen($match[0][0]); - while(@$text[0] == "[") - { - $text = substr($text, 1); - $off += 1; - try - { - $fieldend = find_closing_bracket($text, "[", "]"); + private function back($n = 1) { + if($n <= 0) { + throw new \InvalidArgumentException("\$n must be > 0"); } - catch(\Exception $e) - { - throw new ParseCompileError("Parse Error: Missing closing ']'", $tpl, $off - 1); - } - $node->arrayfields[] = tokenize_text(substr($text, 0, $fieldend), $tpl, $off); - $text = substr($text, $fieldend + 1); - $off += $fieldend + 1; + $this->off = max($this->off - $n, 0); } - $tokens[] = $node; + private function search_off($needle) { + return mb_strpos($this->text, $needle, $this->off); + } - return strlen($text) > 0 ? array_merge($tokens, tokenize_text($text, $tpl, $off)) : $tokens; -} + private function search_multi($needles) { + $oldoff = $this->off; + + $minoff = $this->len; + $which = NULL; + + foreach($needle as $key => $needle) { + if(($off = $this->search_off($needle)) === false) { + continue; + } -function mk_ast($code, $tpl, $err_off) -{ - $ast = array(); - - if(preg_match("/\\<\\s*ste:([a-zA-Z0-9_]*)/s", $code, $matches, PREG_OFFSET_CAPTURE) == 0) - return tokenize_text($code, $tpl, $err_off); - - $ast = tokenize_text(substr($code, 0, $matches[0][1]), $tpl, $err_off); - $tag = new TagNode($tpl, $err_off + $matches[0][1]); - $tag->name = $matches[1][0]; - - $code = substr($code, $matches[0][1] + strlen($matches[0][0])); - $err_off += $matches[0][1] + strlen($matches[0][0]); + if($off < $minoff) { + $minoff = $off; + $which = $key; + } + } + + $this->off = $minoff + (($which === NULL) ? 0 : mb_strlen($which)); + + return array($which, $minoff, mb_substr($this->text, $oldoff, $minoff - $oldoff), $oldoff); + } - $tag->params = array(); + private function search($needle) { + $oldoff = $this->off; + + $off = $this->search_off($needle); + if($off === false) { + $this->off = $this->len; + return array(false, mb_substr($this->text, $oldoff), $oldoff); + } + + $this->off = $off + mb_strlen($needle); + return array($off, mb_substr($this->text, $oldoff, $off - $oldoff), $oldoff); + } - 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, $tpl, $err_off + $matches[2][1] + 1); - $code = substr($code, strlen($matches[0][0])); - $err_off += strlen($matches[0][0]); + private function take_while($cb) { + $s = ""; + while($c = $this->next()) { + if(!call_user_func($cb, $c)) { + $this->back(); + return $s; + } + $s .= $c; + } + return $s; } - if(preg_match("/^\\s*([\\/]?)\\s*\\>/s", $code, $matches) == 0) - throw new ParseCompileError("Parse Error: Missing closing '>' in \"" . $tag->name . "\"-Tag.", $tpl, $tag->offset); + private function skip_ws() { + $this->take_while("ctype_space"); + } - $code = substr($code, strlen($matches[0])); - $err_off += strlen($matches[0]); + private function get_name() { + $off = $this->off; + $name = $this->take_while(function($c) { return ctype_alnum($c) || ($c == "_"); }); + if(mb_strlen($name) == 0) { + throw new ParseCompileError("Expected a name (alphanumeric chars + '_', at least one char)"); + } + return $name; + } - $tag->sub = array(); + public static function parse($text, $name) { + $obj = new self($text, $name); + $res = $obj->parse_text( + self::ESCAPES_DEFAULT, /* Escapes */ + self::PARSE_SHORT | self::PARSE_TAG /* Flags */ + ); + return $res[0]; + } - if($matches[1][0] != "/") - { - /* Handling ste:comment pseudotag */ - if($tag->name == "comment") - { - if(preg_match("/\\<\\s*\\/\\s*ste:comment\\s*\\>/s", $code, $matches, PREG_OFFSET_CAPTURE) == 0) - return $ast; /* Treat the whole code as comment */ - $comment_end = $matches[0][1] + strlen($matches[0][0]); - return array_merge($ast, mk_ast(substr($code, $comment_end), $tpl, $err_off + $comment_end)); + private function parse_text($escapes, $flags, $breakon = NULL, $separator = NULL, $nullaction = NULL, $opentag = NULL, $openedat = -1) { + $elems = array(); + $astlist = array(); + + $needles = array( + "commentopen" => "<ste:comment>", + "rawopen" => "<ste:rawtext>", + "escape" => '\\', + "varcurlyopen" => '${', + "var" => '$', + ); + + if($flags & self::PARSE_TAG) { + $needles["tagopen"] = '<ste:'; + $needles["closetagopen"] = '</ste:'; + } + if($flags & self::PARSE_SHORT) { + $needles["shortifopen"] = '?{'; + $needles["shortcompopen"] = '~{'; } - /* Handling ste:rawtext pseudotag */ - if($tag->name == "rawtext") - { - $tag = new TextNode($tpl, $tag->offset); - if(preg_match("/\\<\\s*\\/\\s*ste:rawtext\\s*\\>/s", $code, $matches, PREG_OFFSET_CAPTURE) == 0) - { - /* Treat the rest of the code as rawtext */ - $tag->text = $code; - $ast[] = $tag; - return $ast; - } - $tag->text = strpos($code, 0, $matches[0][1]); - $ast[] = $tag; - $rawtext_end = $matches[0][1] + strlen($matches[0][0]); - return array_merge($ast, mk_ast(substr($code, $rawtext_end), $tpl, $err_off + $rawtext_end)); + if($separator !== NULL) { + $needles["sep"] = $separator; + } + if($breakon !== NULL) { + $needles["break"] = $breakon; } - $off = 0; - $last_tag_start = 0; - $tagstack = array(array($tag->name, $tag->offset - $err_off)); - 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($closingtag[0] == "/") - { - list($matching_opentag, $mo_off) = array_pop($tagstack); - if($matching_opentag != $matches[2][0]) - throw new ParseCompileError("Parse Error: Missing closing \"ste:$matching_opentag\"-Tag.", $tpl, $mo_off + $err_off); + for(;;) { + list($which, $off, $before, $offbefore) = $this->search_multi($needles); + + $astlist[] = new TextNode($this->name, $offbefore, $before); + + switch($which) { + case NULL: + if($nullaction === NULL) { + $elems[] = $astlist; + return $elems; + } else { + call_user_func($nullaction); + } + break; + case "commentopen": + list($off, $before, $offbefore) = $this->search("</ste:comment>"); + if($off === false) { + throw new ParseCompileError("ste:comment was not closed", $this->name, $offbefore); + } + break; + case "rawopen": + $off_start = $off; + list($off, $before, $offbefore) = $this->search("</ste:rawtext>"); + if($off === false) { + throw new ParseCompileError("ste:rawtext was not closed", $this->name, $off_start); + } + $astlist[] = new TextNode($this->name, $off_start, $before); + break; + case "tagopen": + $astlist[] = $this->parse_tag($off); + break; + case "closetagopen": + $off_start = $off; + $name = $this->get_name(); + $this->skip_ws(); + $off = $this->off; + if($this->next() != ">") { + throw new ParseCompileError("Expected '>' in closing ste-Tag", $this->name, $off); + } + + if($opentag === NULL) { + throw new ParseCompileError("Found closing ste:$name tag, but no tag was opened", $this->name, $off_start); + } + if($opentag != $name) { + throw new ParseCompileError("Open ste:$opentag was not closed", $this->name, $openedat); + } + + $elems[] = $astlist; + return $elems; + case "escape": + $c = $this->next(); + if(mb_strpos($escapes, $c) !== false) { + $astlist[] = new TextNode($this->name, $off, $c); + } else { + $astlist[] = new TextNode($this->name, $off, '\\'); + $this->back(); } - else - $tagstack[] = array($matches[2][0], $matches[0][1]); - } - $last_tag_start = $matches[0][1]; - $off = $last_tag_start + strlen($matches[0][0]); - if(empty($tagstack)) break; + case "shortifopen": + $elems = $this->parse_short("?{", $off); + if(count($elems) != 3) { + throw new ParseCompileError("A short if tag must have the form ?{..|..|..}", $this->name, $off); + } + + list($cond, $then, $else) = $elems; + $thentag = new TagNode($this->name, $off); + $thentag->name = "then"; + $thentag->sub = $then; + + $elsetag = new TagNode($this->name, $off); + $elsetag->name = "else"; + $elsetag->sub = $else; + + $iftag = new TagNode($this->name, $off); + $iftag->name = "if"; + $iftag->sub = $cond; + $iftag->sub[] = $thentag; + $iftag->sub[] = $elsetag; + + $astlist[] = $iftag; + break; + case "shortcompopen": + $elems = $this->parse_short("~{", $off); + if(count($elems) != 3) { + throw new ParseCompileError("A short comparasion tag must have the form ~{..|..|..}", $this->name, $off); + } + + // TODO: What will happen, if a tag was in one of the elements? + list($a, $op, $b) = $elems; + $cmptag = new TagNode($this->name, $off); + $cmptag->name = "cmp"; + $cmptag->params["text_a"] = $a; + $cmptag->params["op"] = $op; + $cmptag->params["text_b"] = $b; + + $astlist[] = $cmptag; + break; + case "sep": + $elems[] = $astlist; + $astlist = array(); + break; + case "varcurlyopen": + $astlist[] = $this->parse_var($off, true); + break; + case "var": + $astlist[] = $this->parse_var($off, false); + break; + case "break": + $elems[] = $astlist; + return $elems; + } } - if((!empty($tagstack)) or ($tag->name != $matches[2][0])) - throw new ParseCompileError("Parse Error: Missing closing \"ste:" . $tag->name . "\"-Tag.", $tpl, $tag->offset); + $elems[] = $astlist; + return $elems; + } + + private function parse_short($shortname, $openedat) { + $tplname = $this->name; - $tag->sub = mk_ast(substr($code, 0, $last_tag_start), $tpl, $err_off); - $code = substr($code, $off); - $err_off += $off; + return $this->parse_text( + self::ESCAPES_DEFAULT, /* Escapes */ + self::PARSE_SHORT | self::PARSE_TAG, /* Flags */ + '}', /* Break on */ + '|', /* Separator */ + function() use ($shortname, $tplname, $openedat) { /* NULL action */ + throw new ParseCompileError("Unclosed $shortname", $tplname, $openedat); + }, + NULL, /* Open tag */ + $openedat /* Opened at */ + ); } - if($tag !== NULL) - $ast[] = $tag; - return array_merge($ast, strlen($code) > 0 ? mk_ast($code, $tpl, $err_off) : array()); -} - -/* - * Function: precompile - * Precompiling STE T/PL templates. - * You only need this function, if you want to manually transcompile a template. - * - * Parameters: - * $code - The input code - * - * Returns: - * The precompiled code. - */ -function precompile($code) -{ - $code = preg_replace( /* Transform short form of comparison (~{a|op|b}) to long form */ - "/(?:(?<!\\\\)~)(?:(?<!\\\\)\\{)(.*?)(?:(?<!\\\\)\\|)(.*?)(?:(?<!\\\\)\\|)(.*?)(?:(?<!\\\\)\\})/s", - "<ste:cmp text_a=\"\$1\" op=\"\$2\" text_b=\"\$3\" />", - $code - ); - $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); - $code = preg_replace("/(?:(?<!\\\\)\\\\\\|)/s", "|", $code); + private function parse_var($openedat, $curly) { + $varnode = new VariableNode($this->name, $openedat); + $varnode->name = $this->get_name(); + $varnode->arrayfields = $this->parse_array(); + + if(!$curly) { + return $varnode; + } + + if($this->next() != "}") { + throw new ParseCompileError("Unclosed '\${'", $this->name, $openedat); + } + $varnode->arrayfields = array_merge($varnode->arrayfields, $this->parse_array()); + return $varnode; + } - return $code; + private function parse_array() { + $tplname = $this->name; + + $arrayfields = array(); + + while($this->next() == "[") { + $openedat = $this->off - 1; + $res = $this->parse_text( + self::ESCAPES_DEFAULT, /* Escapes */ + 0, /* Flags */ + ']', /* Break on */ + NULL, /* Separator */ + function() use ($tplname, $openedat) { /* NULL action */ + throw new ParseCompileError("Unclosed array access '[...]'", $tplname, $openedat); + }, + NULL, /* Open tag */ + $openedat /* Opened at */ + ); + $arrayfields[] = $res[0]; + } + + $this->back(); + return $arrayfields; + } + + private function parse_tag($openedat) { + $tplname = $this->name; + + $this->skip_ws(); + $tag = new TagNode($this->name, $openedat); + $name = $tag->name = $this->get_name(); + $tag->params = array(); + $tag->sub = array(); + + for(;;) { + $this->skip_ws(); + + switch($this->next()) { + case '/': /* Self-closing tag */ + $this->skip_ws(); + if($this->next() != '>') { + throw new ParseCompileError("Unclosed opening <ste: tag (expected >)", $this->name, $openedat); + } + + return $tag; + case '>': + $tag->sub = $this->parse_text( + self::ESCAPES_DEFAULT, /* Escapes */ + self::PARSE_SHORT | self::PARSE_TAG, /* Flags */ + NULL, /* Break on */ + NULL, /* Separator */ + function() use ($name, $tplname, $openedat) { /* NULL action */ + throw new ParseCompileError("Open ste:$name tag was not closed", $tplname, $openedat); + }, + $tag->name, /* Open tag */ + $openedat /* Opened at */ + ); + return $tag; + default: + $this->back(); + + $param = $this->get_name(); + + $this->skip_ws(); + if($this->next() != '=') { + throw new ParseCompileError("Expected '=' after tag parameter name", $this->name, $this->off - 1); + } + $this->skip_ws(); + + $quot = $this->next(); + if(($quot != '"') && ($quot != "'")) { + throw new ParseCompileError("Expected ' or \" after '=' of tag parameter", $this->name, $this->off - 1); + } + + $off = $this->off - 1; + $tag->params[$name] = $this->parse_text( + self::ESCAPES_DEFAULT . $quot, /* Escapes */ + 0, /* Flags */ + $quot, /* Break on */ + NULL, /* Separator */ + function() use ($quot, $tplname, $off) { /* NULL action */ + throw new ParseCompileError("Open tag parameter value ($quot) was not closed", $tplname, $off); + }, + NULL, /* Open tag */ + $off /* Opened at */ + ); + } + } + } } /* @@ -1309,7 +1438,7 @@ class STECore $content = precompile($content); try { - $ast = parse($content, $tpl); + $ast = Parser::parse($content, $tpl); $transc = transcompile($ast); } catch(ParseCompileError $e) |