diff options
Diffstat (limited to 'libbutl/builtin.mxx')
| -rw-r--r-- | libbutl/builtin.mxx | 27 |
1 files changed, 23 insertions, 4 deletions
diff --git a/libbutl/builtin.mxx b/libbutl/builtin.mxx index 2be2f90..e4dd4f8 100644 --- a/libbutl/builtin.mxx +++ b/libbutl/builtin.mxx @@ -153,19 +153,38 @@ LIBBUTL_MODEXPORT namespace butl const dir_path& cwd, const builtin_callbacks&); - class builtin_map: public std::map<std::string, builtin_function*> + // Builtin function and weight. + // + // The weight between 0 and 2 reflects the builtin's contribution to the + // containing script semantics with 0 being the lowest/ignore. Current + // mapping is as follows: + // + // 0 - non-contributing (true, false) + // 1 - non-creative (rm, rmdir, sleep, test) + // 2 - creative (any builtin that may produce output) + // + // If the function is NULL, then the builtin has an external implementation + // and should be executed by running the program with this name. + // + struct builtin_info + { + builtin_function* function; + uint8_t weight; + }; + + class builtin_map: public std::map<std::string, builtin_info> { public: - using base = std::map<std::string, builtin_function*>; + using base = std::map<std::string, builtin_info>; using base::base; // Return NULL if not a builtin. // - builtin_function* + const builtin_info* find (const std::string& n) const { auto i (base::find (n)); - return i != end () ? i->second : nullptr; + return i != end () ? &i->second : nullptr; } }; |