diff options
Diffstat (limited to 'build2/operation')
| -rw-r--r-- | build2/operation | 39 |
1 files changed, 38 insertions, 1 deletions
diff --git a/build2/operation b/build2/operation index ca51ee5..1f3e217 100644 --- a/build2/operation +++ b/build2/operation @@ -17,6 +17,7 @@ namespace build2 class location; class scope; class target_key; + struct opspec; // While we are using uint8_t for the meta/operation ids, we assume // that each is limited to 4 bits (max 128 entries) so that we can @@ -343,7 +344,33 @@ namespace build2 // its semantics. It would be strange to have an operation called // test that does two very different things in different projects. // - extern butl::string_table<meta_operation_id> meta_operation_table; + // A built-in/pre-defined meta-operation can also provide a pre-processor + // callback that will be called for operation-specs before any project + // discovery/bootstrap is performed. + // + struct meta_operation_data + { + // The processor may modify the parameters, opspec, and change the + // meta-operation by returning a different name. + // + // If lifted is true then the operation name in opspec is bogus (has + // been lifted) and the default/empty name should be assumed instead. + // + using process_func = const string& (values&, + vector_view<opspec>&, + bool lifted, + const location&); + + meta_operation_data () = default; + meta_operation_data (const char* n, process_func p = nullptr) + : name (n), process (p) {} + + string name; + process_func* process; + }; + + extern butl::string_table<meta_operation_id, + meta_operation_data> meta_operation_table; extern butl::string_table<operation_id> operation_table; // These are "sparse" in the sense that we may have "holes" that @@ -393,4 +420,14 @@ namespace build2 using operations = sparse_vector<const operation_info>; } +namespace butl +{ + template <> + struct string_table_traits<build2::meta_operation_data> + { + static const std::string& + key (const build2::meta_operation_data& d) {return d.name;} + }; +} + #endif // BUILD2_OPERATION |