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Implement third party plugins loader
Currently only for custom functions. More features to be added later ...
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,155 @@ | ||
| #ifdef _WIN32 | ||
| #include <windows.h> | ||
| #else | ||
| #include <sys/types.h> | ||
| #include <dirent.h> | ||
| #include <errno.h> | ||
| #include <dlfcn.h> | ||
| #endif | ||
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| #include <iostream> | ||
| #include "output.hpp" | ||
| #include "plugins.hpp" | ||
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| #define npos string::npos | ||
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| namespace Sass { | ||
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| Plugins::Plugins(void) { } | ||
| Plugins::~Plugins(void) { } | ||
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| // check if plugin is compatible with this version | ||
| // plugins may be linked static against libsass | ||
| // we try to be compatible between major versions | ||
| inline bool compatibility(const char* their_version) | ||
| { | ||
| // const char* their_version = "3.1.2"; | ||
| // first check if anyone has an unknown version | ||
| const char* our_version = libsass_version(); | ||
| if (!strcmp(their_version, "[na]")) return false; | ||
| if (!strcmp(our_version, "[na]")) return false; | ||
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| // find the position of the second dot | ||
| size_t pos = string(our_version).find('.', 0); | ||
| if (pos != npos) pos = string(our_version).find('.', pos + 1); | ||
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| // if we do not have two dots we fallback to compare complete string | ||
| if (pos == npos) { return strcmp(their_version, our_version) ? 0 : 1; } | ||
| // otherwise only compare up to the second dot (major versions) | ||
| else { return strncmp(their_version, our_version, pos) ? 0 : 1; } | ||
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| } | ||
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| // load one specific plugin | ||
| bool Plugins::load_plugin (const string& path) | ||
| { | ||
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| typedef const char* (*__plugin_version__)(void); | ||
| typedef Sass_C_Function_List (*__plugin_load_fns__)(void); | ||
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| if (LOAD_LIB(plugin, path)) | ||
| { | ||
| // try to load initial function to query libsass version suppor | ||
| if (LOAD_LIB_FN(__plugin_version__, plugin_version, "libsass_get_version")) | ||
| { | ||
| // get the libsass version of the plugin | ||
| if (!compatibility(plugin_version())) return false; | ||
| // try to get import address for "libsass_load_functions" | ||
| if (LOAD_LIB_FN(__plugin_load_fns__, plugin_load_functions, "libsass_load_functions")) | ||
| { | ||
| Sass_C_Function_List fns = plugin_load_functions(); | ||
| while (fns && *fns) { functions.push_back(*fns); ++ fns; } | ||
| } | ||
| // success | ||
| return true; | ||
| } | ||
| else | ||
| { | ||
| // print debug message to stderr (should not happen) | ||
| cerr << "failed loading 'libsass_support' in <" << path << ">" << endl; | ||
| if (const char* dlsym_error = dlerror()) cerr << dlsym_error << endl; | ||
| CLOSE_LIB(plugin); | ||
| } | ||
| } | ||
| else | ||
| { | ||
| // print debug message to stderr (should not happen) | ||
| cerr << "failed loading plugin <" << path << ">" << endl; | ||
| if (const char* dlopen_error = dlerror()) cerr << dlopen_error << endl; | ||
| } | ||
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| return false; | ||
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| } | ||
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| size_t Plugins::load_plugins(const string& path) | ||
| { | ||
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| // count plugins | ||
| size_t loaded = 0; | ||
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| #ifdef _WIN32 | ||
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| try | ||
| { | ||
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| // use wchar (utf16) | ||
| WIN32_FIND_DATAW data; | ||
| // trailing slash is guaranteed | ||
| string globsrch(path + "*.dll"); | ||
| // convert to wide chars (utf16) for system call | ||
| wstring wglobsrch(UTF_8::convert_to_utf16(globsrch)); | ||
| HANDLE hFile = FindFirstFileW(wglobsrch.c_str(), &data); | ||
| // check if system called returned a result | ||
| // ToDo: maybe we should print a debug message | ||
| if (hFile == INVALID_HANDLE_VALUE) return -1; | ||
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| // read directory | ||
| while (true) | ||
| { | ||
| try | ||
| { | ||
| // the system will report the filenames with wide chars (utf16) | ||
| string entry = UTF_8::convert_from_utf16(data.cFileName); | ||
| // check if file ending matches exactly | ||
| if (!ends_with(entry, ".dll")) continue; | ||
| // load the plugin and increase counter | ||
| if (load_plugin(path + entry)) ++ loaded; | ||
| // check if there should be more entries | ||
| if (GetLastError() == ERROR_NO_MORE_FILES) break; | ||
| // load next entry (check for return type) | ||
| if (!FindNextFileW(hFile, &data)) break; | ||
| } | ||
| catch (...) | ||
| { | ||
| // report the error to the console (should not happen) | ||
| // seems like we got strange data from the system call? | ||
| cerr << "filename in plugin path has invalid utf8?" << endl; | ||
| } | ||
| } | ||
| } | ||
| catch (utf8::invalid_utf8) | ||
| { | ||
| // report the error to the console (should not happen) | ||
| // implementors should make sure to provide valid utf8 | ||
| cerr << "plugin path contains invalid utf8" << endl; | ||
| } | ||
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| #else | ||
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| DIR *dp; | ||
| struct dirent *dirp; | ||
| if((dp = opendir(path.c_str())) == NULL) return -1; | ||
| while ((dirp = readdir(dp)) != NULL) { | ||
| if (!ends_with(dirp->d_name, ".so")) continue; | ||
| if (load_plugin(path + dirp->d_name)) ++ loaded; | ||
| } | ||
| closedir(dp); | ||
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| #endif | ||
| return loaded; | ||
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| } | ||
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| } | ||
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