phrases: only allow for index fields

lib/parser/data.hh

@@ -104,11 +104,12 @@ struct Value: public Data {
 	 * @param _value the value
 	 */
 	Value (const std::string& _field, const std::string& _prefix,
-	       unsigned _id, const std::string& _value):
+	       unsigned _id, const std::string& _value, bool _phrase = false):
 		Data(Value::Type::Value, _field, _prefix, _id),
-		value(_value) {}
+		value(_value), phrase(_phrase) {}
 
-	std::string value;	/**< the value */
+	std::string	value;	/**< the value */
+	bool		phrase;
 };
 
 
@@ -128,6 +129,9 @@ operator<< (std::ostream& os, const std::unique_ptr<Data>& v)
 		const auto bval = dynamic_cast<Value*> (v.get());
 		os << ' ' << quote(v->field) << ' '
 		   << quote(utf8_flatten(bval->value));
+		if (bval->phrase)
+			os << " (ph)";
+
 		break;
 	}
 	case Data::Type::Range: {

lib/parser/parser.cc

@@ -68,7 +68,8 @@ value (const ProcIface::FieldInfoVec& fields, const std::string& v,
 		return Tree({Node::Type::Value,
 			     std::make_unique<Value>(
 				     item.field, item.prefix, item.id,
-				     proc->process_value(item.field, val))});
+				     proc->process_value(item.field, val),
+				     item.supports_phrase)});
 	}
 
 	// a 'multi-field' such as "recip:"
@@ -77,7 +78,8 @@ value (const ProcIface::FieldInfoVec& fields, const std::string& v,
 		tree.add_child (Tree({Node::Type::Value,
 				      std::make_unique<Value>(
 					      item.field, item.prefix, item.id,
-					      proc->process_value(item.field, val))}));
+					      proc->process_value(item.field, val),
+					      item.supports_phrase)}));
 	return tree;
 }
 

lib/parser/proc-iface.hh

@@ -41,6 +41,7 @@ struct ProcIface {
 	struct FieldInfo {
 		const std::string	field;
 		const std::string	prefix;
+		bool			supports_phrase;
 		unsigned		id;
 	};
 	using FieldInfoVec = std::vector<FieldInfo>;
@@ -102,7 +103,7 @@ struct DummyProc: public ProcIface { // For testing
 
 	std::vector<FieldInfo>
 	process_field (const std::string& field) const override {
-		return {{ field, "x", 0 }};
+		return {{ field, "x", false, 0 }};
 	}
 
 	std::string

lib/parser/xapian.cc

@@ -52,6 +52,9 @@ static Xapian::Query
 xapian_query_value (const Mux::Tree& tree)
 {
 	const auto v = dynamic_cast<Value*> (tree.node.data.get());
+	if (!v->phrase)
+		return Xapian::Query(v->prefix + v->value);
+
 	const auto parts = split (v->value, " ");
 
 	std::vector<Xapian::Query> phvec;