From 53e6f30c3df36fcf51036d0d7b51f3a1cefd9b9b Mon Sep 17 00:00:00 2001
From: Adam Wardynski <award@.(win7-laptop)>
Date: Sun, 21 Nov 2010 21:14:08 +0100
Subject: [PATCH] Expression, new abstract base class for all WCCL expressions.
This is to accomodate rules in future, and repurpose "Operator" to be a
library api-level class for users of the library, for parsed functional
operators.
---
libwccl/ops/expression.h | 28 ++++++++++++++++++++++++++++
1 file changed, 28 insertions(+)
create mode 100644 libwccl/ops/expression.h
diff --git a/libwccl/ops/expression.h b/libwccl/ops/expression.h
new file mode 100644
index 0000000..8d3e71a
--- /dev/null
+++ b/libwccl/ops/expression.h
@@ -0,0 +1,28 @@
+#ifndef LIBWCCL_OPS_EXPRESSION_H
+#define LIBWCCL_OPS_EXPRESSION_H
+
+#include <libcorpus2/tagset.h>
+#include <boost/noncopyable.hpp>
+
+namespace Wccl {
+
+/**
+ * Abstract base class for WCCL expressions
+ */
+class Expression : public boost::noncopyable {
+public:
+ /**
+ * @returns String representation of the expression.
+ */
+ virtual std::string to_string(const Corpus2::Tagset& tagset) const = 0;
+ /**
+ * @returns String representation of the expression that does not
+ * require a tagset.
+ * @note Might be incomplete and/or contain internal info.
+ */
+ virtual std::string to_raw_string() const = 0;
+};
+
+} /* end ns Wccl */
+
+#endif // LIBWCCL_OPS_EXPRESSION_H
--
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