Implemented ArrayParser and unit tests to verify its working.

tests/PgsqlTests/tst_ArrayParser.cpp

@@ -0,0 +1,92 @@
+#include <gtest/gtest.h>
+#include <gmock/gmock-matchers.h>
+#include "ArrayParser.h"
+#include "PrintTo_Qt.h"
+
+using namespace testing;
+using namespace Pgsql;
+
+TEST(ArrayParser, emptyInput)
+{
+	const char * input = "";
+	ArrayParser parser(input);
+	auto res = parser.GetNextElem();
+	ASSERT_FALSE(res.ok);
+}
+
+TEST(ArrayParser, emptyArray)
+{
+	const char * input = "{}";
+	ArrayParser parser(input);
+	auto res = parser.GetNextElem();
+	ASSERT_FALSE(res.ok);
+}
+
+TEST(ArrayParser, oneInt)
+{
+	const char * input = "{1}";
+	ArrayParser parser(input);
+	auto res = parser.GetNextElem();
+	ASSERT_TRUE(res.ok);
+	ASSERT_EQ(res.value, "1");
+
+	res = parser.GetNextElem();
+	ASSERT_FALSE(res.ok);
+}
+
+TEST(ArrayParser, twoElems)
+{
+	const char * input = "{1,2.3}";
+	ArrayParser parser(input);
+
+	auto res = parser.GetNextElem();
+	ASSERT_TRUE(res.ok);
+	ASSERT_EQ(res.value, "1");
+
+	res = parser.GetNextElem();
+	ASSERT_TRUE(res.ok);
+	ASSERT_EQ(res.value, "2.3");
+
+	res = parser.GetNextElem();
+	ASSERT_FALSE(res.ok);
+}
+
+TEST(ArrayParser, nullElem)
+{
+	const char * input = "{NULL}";
+	ArrayParser parser(input);
+	auto res = parser.GetNextElem();
+	ASSERT_TRUE(res.ok);
+	ASSERT_EQ(res.value, std::nullopt);
+
+	res = parser.GetNextElem();
+	ASSERT_FALSE(res.ok);
+}
+
+
+
+// ARRAY['ab c', NULL, 'def', 'd"e', 'g''h ', 'g,j']
+// {"ab c",NULL,def,"d\"e","g'h ","g,j"}
+
+TEST(ArrayParser, quotedValues)
+{
+	const char * input = R"_({"ab c","de\"f"})_";
+	ArrayParser parser(input);
+	auto res = parser.GetNextElem();
+	ASSERT_TRUE(res.ok);
+	ASSERT_EQ(res.value, "ab c");
+
+	res = parser.GetNextElem();
+	ASSERT_TRUE(res.ok);
+	ASSERT_EQ(res.value, "de\"f");
+
+	res = parser.GetNextElem();
+	ASSERT_FALSE(res.ok);
+}
+
+
+// ARRAY['2017-12-11'::date, NULL]
+// {2017-12-11,NULL}
+
+// NULL::int2
+// null