lex() operator, to translate strings via a lexicon.

libwccl/CMakeLists.txt

@@ -56,6 +56,7 @@ SET(libwccl_STAT_SRC
 	ops/functions/strset/affix.cpp
 	ops/functions/strset/getlemmas.cpp
 	ops/functions/strset/getorth.cpp
+	ops/functions/strset/lextranslator.cpp
 	ops/functions/strset/tolower.cpp
 	ops/functions/strset/toupper.cpp
 	ops/functions/tset/agrfilter.cpp

libwccl/ops/functions/strset/lextranslator.cpp

+#include <libwccl/ops/functions/strset/lextranslator.h>
+#include <sstream>
+
+namespace Wccl {
+
+std::string LexTranslator::to_string(const Corpus2::Tagset& tagset) const
+{
+	std::ostringstream os;
+	os << name(tagset) << "(" 
+		<< strset_expr_->to_string(tagset) << ", \""
+		<< lexicon_->name() << "\")";
+	return os.str();
+}
+
+std::ostream& LexTranslator::write_to(std::ostream& os) const
+{
+	os << raw_name() << "(" << *strset_expr_ << ", \"" << lexicon_->name() << "\")";
+	return os;
+}
+
+LexTranslator::BaseRetValPtr LexTranslator::apply_internal(
+	const FunExecContext& context) const
+{
+	boost::shared_ptr<const StrSet> set = strset_expr_->apply(context);
+	return lexicon_->translate(*set);
+}
+
+} /* end ns Wccl */

libwccl/ops/functions/strset/lextranslator.h

+#ifndef LIBWCCL_OPS_FUNCTIONS_STRSET_LEXTRANSLATOR_H
+#define LIBWCCL_OPS_FUNCTIONS_STRSET_LEXTRANSLATOR_H
+
+#include <libwccl/values/strset.h>
+#include <libwccl/ops/function.h>
+#include <libwccl/lexicon/lexicon.h>
+
+namespace Wccl {
+
+/**
+ * WCCL functional operator "lex", translates strings via a lexicon.
+ */ 
+class LexTranslator : public Function<StrSet>
+{
+public:
+	LexTranslator(
+		const boost::shared_ptr<Function<StrSet> >& strset_expr,
+		const boost::shared_ptr<const Lexicon>& lexicon)
+		: strset_expr_(strset_expr),
+		  lexicon_(lexicon)
+	{
+		BOOST_ASSERT(strset_expr_);
+		BOOST_ASSERT(lexicon_);
+	}
+
+	/**
+	 * @returns String representation of the function in the form of
+	 */
+	std::string to_string(const Corpus2::Tagset& tagset) const;
+
+	/**
+	 * @returns Name of the function
+	 */
+	std::string raw_name() const {
+		return "orth";
+	}
+protected:
+	std::ostream& write_to(std::ostream& os) const;
+
+	/**
+	 * Get a string set from the argument expression and return a copy,
+	 * translated using the lexicon given at construction. Strings that don't
+	 * exist in the lexicon are removed from output, whereas strings that
+	 * exist as keys are replaced with corresponding values.
+	 */
+	BaseRetValPtr apply_internal(const FunExecContext& context) const;
+
+private:
+	const boost::shared_ptr<Function<StrSet> > strset_expr_;
+	const boost::shared_ptr<const Lexicon> lexicon_;
+};
+
+} /* end ns Wccl */
+
+#endif // LIBWCCL_OPS_FUNCTIONS_STRSET_LEXTRANSLATOR_H