started query builder

include/matador/utils/constraints.hpp

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+#ifndef QUERY_CONSTRAINTS_HPP
+#define QUERY_CONSTRAINTS_HPP
+
+namespace matador::utils {
+
+enum class constraints : unsigned char {
+  NONE =        0,
+  NOT_NULL =    1 << 0,
+  INDEX =       1 << 1,
+  UNIQUE =      1 << 2,
+  PRIMARY_KEY = 1 << 3,
+  FOREIGN_KEY = 1 << 4,
+  DEFAULT =     1 << 5,
+  UNIQUE_NOT_NULL = UNIQUE | NOT_NULL
+};
+
+//static std::unordered_map<constraints, std::string> constraints_to_name_map();
+
+inline constraints operator|(constraints a, constraints b)
+{
+  return static_cast<constraints>(static_cast<unsigned int>(a) | static_cast<unsigned int>(b));
+}
+
+inline constraints operator&(constraints a, constraints b)
+{
+  return static_cast<constraints>(static_cast<unsigned int>(a) & static_cast<unsigned int>(b));
+}
+
+inline bool is_constraint_set(constraints source, constraints needle)
+{
+  return static_cast<int>(source & needle) > 0;
+}
+
+}
+#endif //QUERY_CONSTRAINTS_HPP

include/matador/utils/field_attributes.hpp

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+#ifndef QUERY_FIELD_ATTRIBUTES_HPP
+#define QUERY_FIELD_ATTRIBUTES_HPP
+
+#include "constraints.hpp"
+
+#include <cstdlib>
+
+namespace matador::utils {
+
+class field_attributes
+{
+public:
+  field_attributes() = default;
+  field_attributes(size_t size); // NOLINT(*-explicit-constructor)
+  field_attributes(constraints options); // NOLINT(*-explicit-constructor)
+  field_attributes(size_t size, constraints options);
+  field_attributes(const field_attributes &x) = default;
+  field_attributes& operator=(const field_attributes &x) = default;
+  field_attributes(field_attributes &&x) = default;
+  field_attributes& operator=(field_attributes &&x) = default;
+  ~field_attributes() = default;
+
+  [[nodiscard]] size_t size() const;
+  [[nodiscard]] constraints options() const;
+
+private:
+  size_t size_ = 0;
+  constraints options_ = constraints::NONE;
+};
+
+const field_attributes null_attributes {};
+
+}
+#endif //QUERY_FIELD_ATTRIBUTES_HPP

include/matador/utils/string.hpp

@@ -0,0 +1,19 @@
+#ifndef QUERY_STRING_HPP
+#define QUERY_STRING_HPP
+
+#include <string>
+
+namespace matador::utils {
+
+/**
+ * Replaces all occurrences of string from in given string
+ * with string to.
+ *
+ * @param in Source string where the replacement takes place
+ * @param from The string to be replaced
+ * @param to The new string
+ */
+void replace_all(std::string &in, const std::string &from, const std::string &to);
+
+}
+#endif //QUERY_STRING_HPP