usql update

ml_util.cpp

@@ -4,11 +4,13 @@
 #include <string>
 #include <vector>
 #include <algorithm>
-#include <filesystem>
 #include <iostream>
+// #include <filesystem>
 
 std::vector<std::string> commands {};
 
+// kryplove z applu a jejich problemy s filesystemem
+/*
 std::string get_history_file_dir() {
 	std::string filename{".ml_history.txt"};
 	const char *t = std::getenv("HOME");
@@ -16,6 +18,15 @@ std::string get_history_file_dir() {
 	if (t == nullptr) return std::filesystem::temp_directory_path() / filename;
 	else return std::filesystem::path(std::string{t}) /filename;
 }	
+ */
+
+std::string get_history_file_dir() {
+	std::string file{"/.ml_history.txt"};
+	const char *t = std::getenv("HOME");
+
+	if (t == nullptr) return "/tmp/" + file;
+	else return std::string{t} + "/" + file;
+}	
 
 MlEnvironment * repl_env = nullptr;
 

usql/parser.cpp

@@ -12,7 +12,7 @@ namespace usql {
 		if (type == ColumnType::date_type)	return "date_type";
 		if (type == ColumnType::bool_type)	return "bool_type";
 
-		throw Exception("invalid column type: " + (int)type);	
+		throw Exception("invalid column type: " + std::to_string((int)type));	
 	};
 
 

usql/parser.h

@@ -132,6 +132,7 @@ struct FunctionNode : Node {
 		pp,
 		lower,
 		upper,
+		coalesce,
 		min,
 		max,
 		count
@@ -144,6 +145,7 @@ struct FunctionNode : Node {
 		if (str=="pp")			return Type::pp;
 		if (str=="lower")		return Type::lower;
 		if (str=="upper")		return Type::upper;
+		if (str=="coalesce")		return Type::coalesce;
 		if (str=="min")			return Type::min;
 		if (str=="max")			return Type::max;
 		if (str=="count")		return Type::count;
@@ -158,11 +160,12 @@ struct FunctionNode : Node {
 		if (type == Type::pp)			return "pp";
 		if (type == Type::lower)		return "lower";
 		if (type == Type::upper)		return "upper";
+		if (type == Type::coalesce)		return "coalesce";
 		if (type == Type::min)			return "min";
 		if (type == Type::max)			return "max";
 		if (type == Type::count)		return "count";
 
-		throw Exception("invalid function: " + (int)type);	
+		throw Exception("invalid function: " + std::to_string((int)type));	
 	};
 
 

usql/usql.cpp

@@ -173,6 +173,9 @@ std::unique_ptr<ValueNode> USql::eval_function_value_node(Table *table, Row &row
 		evaluatedPars.push_back(eval_value_node(table, row, param.get(), nullptr, nullptr));
 	}
 
+	// coalesce function can have first parameter null, so must be calles before following "return null"
+	if (fnc->function == FunctionNode::Type::coalesce) return coalesce_function(evaluatedPars);
+	
 	if (evaluatedPars.empty() || evaluatedPars[0]->isNull())
 		return std::make_unique<NullValueNode>();
 

usql/usql.h

@@ -73,6 +73,7 @@ private:
 
     static std::unique_ptr<ValueNode> lower_function(const std::vector<std::unique_ptr<ValueNode>> &evaluatedPars);
     static std::unique_ptr<ValueNode> upper_function(const std::vector<std::unique_ptr<ValueNode>> &evaluatedPars);
+    static std::unique_ptr<ValueNode> coalesce_function(const std::vector<std::unique_ptr<ValueNode>> &evaluatedPars);
     static std::unique_ptr<ValueNode> to_date_function(const std::vector<std::unique_ptr<ValueNode>> &evaluatedPars);
     static std::unique_ptr<ValueNode> to_string_function(const std::vector<std::unique_ptr<ValueNode>> &evaluatedPars);
     static std::unique_ptr<ValueNode> date_add_function(const std::vector<std::unique_ptr<ValueNode>> &evaluatedPars);

usql/usql_dml.cpp

@@ -239,6 +239,13 @@ std::tuple<int, ColDefNode> USql::get_node_definition(Table *table, Node * node,
 			// TODO get length, use get_db_column_definition
 			ColDefNode col_def = ColDefNode{col_name, ColumnType::varchar_type, col_order, 256, true};
 			return std::make_tuple(FUNCTION_CALL, col_def);
+		} else if (func_node->function == FunctionNode::Type::coalesce) {
+			// TODO handle cases here
+			if (func_node->params.empty()) throw Exception("Coalesce without parameters");
+			if (func_node->params[0]->node_type != NodeType::database_value) throw Exception("Coalesce first parameter must be database column");
+			ColDefNode tbl_col_def = get_db_column_definition(table, func_node->params[0].get());
+			ColDefNode col_def = ColDefNode{col_name, tbl_col_def.type, col_order, tbl_col_def.length, true};
+			return std::make_tuple(FUNCTION_CALL, col_def);
 		} else if (func_node->function == FunctionNode::Type::min || func_node->function == FunctionNode::Type::max) {
 			auto col_type= ColumnType::float_type;
 			size_t col_len = 1;

usql/usql_function.cpp

@@ -34,6 +34,13 @@ std::unique_ptr<ValueNode> USql::date_add_function(const std::vector<std::unique
 }
 
 
+std::unique_ptr<ValueNode> USql::lower_function(const std::vector<std::unique_ptr<ValueNode>> &evaluatedPars) {
+	std::string str = evaluatedPars[0]->getStringValue();
+	std::transform(str.begin(), str.end(), str.begin(), [](unsigned char c) -> unsigned char { return tolower(c); });
+	
+	return std::make_unique<StringValueNode>(str);
+}
+
 std::unique_ptr<ValueNode> USql::upper_function(const std::vector<std::unique_ptr<ValueNode>> &evaluatedPars) {
 	std::string str = evaluatedPars[0]->getStringValue();
 	std::transform(str.begin(), str.end(), str.begin(), [](unsigned char c) -> unsigned char { return toupper(c); });
@@ -41,11 +48,21 @@ std::unique_ptr<ValueNode> USql::upper_function(const std::vector<std::unique_pt
 	return std::make_unique<StringValueNode>(str);
 }
 
-std::unique_ptr<ValueNode> USql::lower_function(const std::vector<std::unique_ptr<ValueNode>> &evaluatedPars) {
-	std::string str = evaluatedPars[0]->getStringValue();
-	std::transform(str.begin(), str.end(), str.begin(), [](unsigned char c) -> unsigned char { return tolower(c); });
-	
-	return std::make_unique<StringValueNode>(str);
+std::unique_ptr<ValueNode> USql::coalesce_function(const std::vector<std::unique_ptr<ValueNode>> &evaluatedPars) {
+	for(const auto & par : evaluatedPars) {
+		if (!par->isNull()) {
+			// TODO implement rest and take it out as a function
+		 	if (par->node_type == NodeType::int_value)
+				return std::make_unique<IntValueNode>(par->getIntegerValue());
+		 	if (par->node_type == NodeType::float_value)
+				return std::make_unique<DoubleValueNode>(par->getDoubleValue());
+			if (par->node_type == NodeType::string_value)
+				return std::make_unique<StringValueNode>(par->getStringValue());
+			if (par->node_type == NodeType::bool_value)
+				return std::make_unique<BooleanValueNode>(par->getBooleanValue());
+		}
+	}
+	return std::make_unique<NullValueNode>();
 }
 
 std::unique_ptr<ValueNode> USql::pp_function(const std::vector<std::unique_ptr<ValueNode>> &evaluatedPars) {