diff options
Diffstat (limited to 'libbutl/manifest-serializer.mxx')
| -rw-r--r-- | libbutl/manifest-serializer.mxx | 30 |
1 files changed, 26 insertions, 4 deletions
diff --git a/libbutl/manifest-serializer.mxx b/libbutl/manifest-serializer.mxx index 66ca398..6a87656 100644 --- a/libbutl/manifest-serializer.mxx +++ b/libbutl/manifest-serializer.mxx @@ -11,8 +11,9 @@ #ifndef __cpp_lib_modules #include <string> #include <iosfwd> -#include <cstddef> // size_t -#include <stdexcept> // runtime_error +#include <cstddef> // size_t +#include <stdexcept> // runtime_error +#include <functional> #endif // Other includes. @@ -42,8 +43,23 @@ LIBBUTL_MODEXPORT namespace butl class LIBBUTL_SYMEXPORT manifest_serializer { public: - manifest_serializer (std::ostream& os, const std::string& name) - : os_ (os), name_ (name) {} + // The filter, if specified, is called by next() prior to serializing the + // pair into the stream. If the filter returns false, then the pair is + // discarded. + // + // Note that currently there is no way for the filter to modify the name + // or value. If we ever need this functionality, then we can add an + // "extended" filter alternative with two "receiving" arguments: + // + // bool (..., optional<string>& n, optional<string>& v); + // + using filter_function = bool (const std::string& name, + const std::string& value); + + manifest_serializer (std::ostream& os, + const std::string& name, + std::function<filter_function> filter = {}) + : os_ (os), name_ (name), filter_ (std::move (filter)) {} const std::string& name () const {return name_;} @@ -77,6 +93,9 @@ LIBBUTL_MODEXPORT namespace butl private: friend class manifest_rewriter; + void + write_next (const std::string& name, const std::string& value); + // Validate and write a name. // void @@ -105,5 +124,8 @@ LIBBUTL_MODEXPORT namespace butl private: std::ostream& os_; const std::string name_; + const std::function<filter_function> filter_; }; } + +#include <libbutl/manifest-serializer.ixx> |