Added function to rebuild the original expression (8e8a6d7b) · Commits · Progetti / IfAuthEx DokuWiki Plugin

parser.php

+66 −0

Original line number	Diff line number	Diff line
		@@ -42,6 +42,31 @@ class ElementInstance {
		return implode('', $pieces);
		}

		public function getRepresentation() {
		static $stack_depth = 0; global $STACK_LIMIT;
		if (++$stack_depth > $STACK_LIMIT) {
		throw new RuntimeException('Stack limit exceeded.');
		}
		try {
		if ($this->definition() === null) {
		$this->ensureWellFormed(false);
		// The expression is guaranteed to have 0 or 1 arguments because it's well formed.
		if (count($this->args()) == 0) {
		return '';
		}
		if ($this->args()[0] instanceof ElementInstance) {
		return $this->args()[0]->getRepresentation();
		} else {
		return $this->args()[0]->match();
		}
		} else {
		return $this->definition()->getRepresentation($this);
		}
		} finally {
		--$stack_depth;
		}
		}

		public function isExpanded($recursive=true) {
		static $stack_depth = 0; global $STACK_LIMIT;
		if (++$stack_depth > $STACK_LIMIT) {
		@@ -518,6 +543,47 @@ class ElementDefinition {
		return $this->_evaluateWellFormed($elmInstance);
		}

		public function getTokenDefRepr($idx) {
		if ($idx < count($this->tokenDefs())) {
		return $this->tokenDefs()[$idx]->representation();
		} elseif (count($this->tokenDefs()) == 1) {
		return $this->tokenDefs()[0]->representation();
		}
		return '';
		}

		public function getRepresentation($elmInstance) {
		$this->ensureWellFormed($elmInstance);
		$argsRepr = array();
		foreach ($elmInstance->args() as $arg) {
		if ($arg instanceof TokenInstance) {
		$argsRepr[] = $arg->match();
		} else {
		$argsRepr[] = $arg->getRepresentation();
		}
		}
		$pieces = array();
		if ($this->fixing() == Fixing::Prefix \|\| $this->fixing() == Fixing::Wrap) {
		$pieces[] = $this->getTokenDefRepr(0);
		}
		$argIdx = ($this->fixing() == Fixing::Postfix \|\| $this->fixing() == Fixing::Infix ? -1 : 0);
		foreach ($argsRepr as $argRepr) {
		$pieces[] = $argRepr;
		++$argIdx;
		if ($this->fixing() == Fixing::None && $this->fixing() == Fixing::Wrap) {
		continue;
		}
		if ($argIdx >= count($argsRepr) \|\| ($this->fixing() == Fixing::Infix && $argIdx >= count($argsRepr) - 1)) {
		continue;
		}
		$pieces[] = $this->getTokenDefRepr($argIdx);
		}
		if ($this->fixing() == Fixing::Wrap) {
		$pieces[] = $this->getTokenDefRepr(1);
		}
		return implode('', $pieces);
		}

		static public function extractUsedTokens($elmDefs) {
		$retval = array();
		foreach ($elmDefs as $elmDef) {

test.php

+4 −1

Original line number	Diff line number	Diff line
		@@ -5,7 +5,10 @@ require_once "grammar.php";
		$text = 'usr1 \|\|(!usr2&&@group \|\| !usr3)';
		echo 'Parsing "' . $text . '".' . "\n";
		$expr = parse($text);
		echo "Tree representation:\n";
		$expr->printTree();
		echo "Value:\n";
		var_dump($expr->evaluate());

		echo "Reconstructed expression:\n";
		echo $expr->getRepresentation() . "\n";
		?>
		No newline at end of file