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Implements BSON deserialisation, other than arrays.

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This commit is contained in:
Thomas Harte
2020-05-25 23:39:00 -04:00
parent c83c827484
commit 4d34d9ae2b
3 changed files with 207 additions and 9 deletions
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Reflection/Struct.hpp
+31 -2
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@@ -29,6 +29,7 @@ struct Struct {
virtual const std::type_info *type_of(const std::string &name) const = 0;
virtual size_t count_of(const std::string &name) const = 0;
virtual void set(const std::string &name, const void *value) = 0;
virtual void *get(const std::string &name) = 0;
virtual const void *get(const std::string &name) const = 0;
virtual std::vector<std::string> values_for(const std::string &name) const = 0;
virtual ~Struct() {}
@@ -40,21 +41,38 @@ struct Struct {
std::string description() const;
/*!
@returns The BSON serialisation of this struct.
Serialises this struct in BSON format.
Supported field types:
* [u]int[8/16/32/64]_t;
* float and double;
* bool;
* std::string;
* plain C-style arrays of any of the above;
* other reflective structs;
* std::vector<uint8_t> as raw binary data.
TODO: vector of string, possibly? Or more general vector support?
@returns The BSON serialisation.
*/
std::vector<uint8_t> serialise() const;
/*!
Applies as many fields as possible from the incoming BSON.
Applies as many fields as possible from the incoming BSON. Supports the same types
as @c serialise.
*/
bool deserialise(const std::vector<uint8_t> &bson);
/*!
Called to determine whether @c key should be included in the serialisation of this struct.
*/
virtual bool should_serialise(const std::string &key) const { return true; }
private:
void append(std::ostringstream &stream, const std::string &key, const std::type_info *type, size_t offset) const;
bool deserialise(const uint8_t *bson, size_t size);
};
/*!
@@ -68,9 +86,11 @@ template <typename Type> bool set(Struct &target, const std::string &name, Type
Setting an int:
* to an int copies the int;
* to a smaller type, truncates the int;
* to an int64_t promotes the int; and
* to a registered enum, copies the int.
*/
template <> bool set(Struct &target, const std::string &name, int64_t value);
template <> bool set(Struct &target, const std::string &name, int value);
/*!
@@ -89,6 +109,9 @@ template <> bool set(Struct &target, const std::string &name, const char *value)
template <> bool set(Struct &target, const std::string &name, bool value);
template <> bool set(Struct &target, const std::string &name, float value);
template <> bool set(Struct &target, const std::string &name, double value);
/*!
Fuzzy-set attempts to set any property based on a string value. This is intended to allow input provided by the user.
@@ -126,6 +149,12 @@ template <typename Owner> class StructImpl: public Struct {
@returns the value of type @c Type that is loaded from the offset registered for the field @c name.
It is the caller's responsibility to provide an appropriate type of data.
*/
void *get(const std::string &name) final {
const auto iterator = contents_.find(name);
if(iterator == contents_.end()) return nullptr;
return reinterpret_cast<uint8_t *>(this) + iterator->second.offset;
}
const void *get(const std::string &name) const final {
const auto iterator = contents_.find(name);
if(iterator == contents_.end()) return nullptr;