MatchOperator - operator for match rules.

libwccl/CMakeLists.txt

@@ -55,6 +55,7 @@ SET(libwccl_STAT_SRC
 	ops/functions/tset/getsymbols.cpp
 	ops/functions/tset/getsymbolsinrange.cpp
 	ops/match/conditions/tokencondition.cpp
+	ops/match/matchoperator.cpp
 	ops/rulesequence.cpp
 	ops/tagaction.cpp
 	ops/tagactions/delete.cpp

libwccl/ops/match/matchoperator.cpp

+#include <libwccl/ops/match/matchoperator.h>
+#include <libpwrutils/foreach.h>
+#include <sstream>
+
+namespace Wccl {
+
+const char* MatchOperator::IterationPosVarName = "$_";
+
+boost::shared_ptr<MatchVector> MatchOperator::execute(
+		boost::shared_ptr<Position> iter_pos,
+		const ActionExecContext &context) const
+{
+	boost::shared_ptr<MatchVector> matches(new MatchVector());
+	int orig_iter_pos = iter_pos->get_value();
+
+	foreach (const boost::shared_ptr<const MatchCondition>& cond, _conditions) {
+		MatchResult res = cond->apply(iter_pos, context);
+		if(res.matched()) {
+			matches->append(res.get_match());
+		} else {
+			matches.reset(new MatchVector());
+			iter_pos->set_value(orig_iter_pos + 1);
+			return matches;
+		}
+	}
+	return matches;
+}
+
+std::string MatchOperator::to_string(const Corpus2::Tagset& tagset) const
+{
+	std::ostringstream ostream;
+	ostream << name() << "(";
+	for(size_t i = 0; i < _conditions.size(); ++i) {
+		if (i != 0) {
+			ostream << ", ";
+		}
+		ostream << _conditions[i]->to_string(tagset);
+	}
+	ostream << ")";
+	return ostream.str();
+}
+
+std::ostream& MatchOperator::write_to(std::ostream &ostream) const
+{
+	ostream << name() << "(";
+	for(size_t i = 0; i < _conditions.size(); ++i) {
+		if (i != 0) {
+			ostream << ", ";
+		}
+		ostream << *_conditions[i];
+	}
+	ostream << ")";
+	return ostream;
+}
+
+} /* end ns Wccl */

libwccl/ops/match/matchoperator.h

+#ifndef LIBWCCL_OPS_MATCH_MATCHOPERATOR_H
+#define LIBWCCL_OPS_MATCH_MATCHOPERATOR_H
+
+#include <libwccl/ops/match/matchcondition.h>
+#include <libwccl/values/matchvector.h>
+
+namespace Wccl {
+
+/**
+ * Operator that realizes "match" functionality for match rules
+ */
+class MatchOperator : public Expression
+{
+public:
+	static const char* IterationPosVarName;
+
+	MatchOperator(const std::vector< boost::shared_ptr<const MatchCondition> >& conditions)
+		: _conditions(conditions) {
+	}
+
+	/**
+	 * @returns Name of the operator.
+	 */
+	std::string name() const {
+		return "match";
+	}
+
+	/**
+	 * @returns String representation of the Action
+	 */
+	std::string to_string(const Corpus2::Tagset& tagset) const;
+
+protected:
+	/**
+	 * Writes string representation of the operator to
+	 * an output stream.
+	 * @returns Stream written to.
+	 * @note May be incomplete and/or containt internal info.
+	 */
+	std::ostream& write_to(std::ostream& ostream) const;
+
+	/**
+	 * Executes the operator on given context.
+	 * @returns Vector of matches corresponding to match conditions,
+	 * if all conditions were met. In such case position $_ is advanced past matched tokens.
+	 * Empty MatchVector is returned if any of conditions was not met.
+	 * In such case Position $_ is advanced by 1.
+	 * @param iter_pos Pointer to the variable $_ from context's Variables
+	 * @param context Execution context - current sentence and Variables to operate on
+	 */
+	boost::shared_ptr<MatchVector> execute(
+			boost::shared_ptr<Position> iter_pos,
+			const ActionExecContext &context) const;
+
+private:
+	const std::vector<boost::shared_ptr<const MatchCondition> > _conditions;
+};
+
+} /* end ns Wccl */
+
+#endif // LIBWCCL_OPS_MATCH_MATCHOPERATOR_H