Add configuration for supporting additional extensions as .scss

This is big step towards removing non-standard raw css imports.

Using `sass_option_push_import_extension` implementors can choose
to treat any extension they like as a `.scss` file.

Closes #1964

Author: xzyfer

include/sass/context.h

@@ -149,6 +149,9 @@ ADDAPI size_t ADDCALL sass_compiler_get_callee_stack_size(struct Sass_Compiler*
 ADDAPI Sass_Callee_Entry ADDCALL sass_compiler_get_last_callee(struct Sass_Compiler* compiler);
 ADDAPI Sass_Callee_Entry ADDCALL sass_compiler_get_callee_entry(struct Sass_Compiler* compiler, size_t idx);
 
+// Push function for import extenions
+ADDAPI void ADDCALL sass_option_push_import_extension (struct Sass_Options* options, const char* ext);
+
 // Push function for paths (no manipulation support for now)
 ADDAPI void ADDCALL sass_option_push_plugin_path (struct Sass_Options* options, const char* path);
 ADDAPI void ADDCALL sass_option_push_include_path (struct Sass_Options* options, const char* path);

src/context.cpp

@@ -96,6 +96,8 @@ namespace Sass {
     // include_paths.push_back(CWD);
 
     // collect more paths from different options
+    collect_extensions(c_options.extension);
+    collect_extensions(c_options.extensions);
     collect_include_paths(c_options.include_path);
     collect_include_paths(c_options.include_paths);
     collect_plugin_paths(c_options.plugin_path);
@@ -166,6 +168,37 @@ namespace Sass {
   {
   }
 
+  void Context::collect_extensions(const char* exts_str)
+  {
+    if (exts_str) {
+      const char* beg = exts_str;
+      const char* end = Prelexer::find_first<PATH_SEP>(beg);
+
+      while (end) {
+        std::string ext(beg, end - beg);
+        if (!ext.empty()) {
+          extensions.push_back(ext);
+        }
+        beg = end + 1;
+        end = Prelexer::find_first<PATH_SEP>(beg);
+      }
+
+      std::string ext(beg);
+      if (!ext.empty()) {
+        extensions.push_back(ext);
+      }
+    }
+  }
+
+  void Context::collect_extensions(string_list* paths_array)
+  {
+    while (paths_array)
+    {
+      collect_extensions(paths_array->string);
+      paths_array = paths_array->next;
+    }
+  }
+
   void Context::collect_include_paths(const char* paths_str)
   {
     if (paths_str) {
@@ -236,15 +269,20 @@ namespace Sass {
   // looks for alternatives and returns a list from one directory
   std::vector<Include> Context::find_includes(const Importer& import)
   {
+    // include configured extensions
+    std::vector<std::string> exts(File::defaultExtensions);
+    if (extensions.size() > 0) {
+      exts.insert(exts.end(), extensions.begin(), extensions.end());
+    }
     // make sure we resolve against an absolute path
     std::string base_path(rel2abs(import.base_path));
     // first try to resolve the load path relative to the base path
-    std::vector<Include> vec(resolve_includes(base_path, import.imp_path));
+    std::vector<Include> vec(resolve_includes(base_path, import.imp_path, exts));
     // then search in every include path (but only if nothing found yet)
     for (size_t i = 0, S = include_paths.size(); vec.size() == 0 && i < S; ++i)
     {
       // call resolve_includes and individual base path and append all results
-      std::vector<Include> resolved(resolve_includes(include_paths[i], import.imp_path));
+      std::vector<Include> resolved(resolve_includes(include_paths[i], import.imp_path, exts));
       if (resolved.size()) vec.insert(vec.end(), resolved.begin(), resolved.end());
     }
     // return vector

src/context.hpp

@@ -67,6 +67,7 @@ namespace Sass {
 
     std::vector<std::string> plugin_paths; // relative paths to load plugins
     std::vector<std::string> include_paths; // lookup paths for includes
+    std::vector<std::string> extensions; // lookup extensions for imports`
 
 
 
@@ -109,6 +110,8 @@ namespace Sass {
     void collect_plugin_paths(string_list* paths_array);
     void collect_include_paths(const char* paths_str);
     void collect_include_paths(string_list* paths_array);
+    void collect_extensions(const char* extensions_str);
+    void collect_extensions(string_list* extensions_array);
     std::string format_embedded_source_map();
     std::string format_source_mapping_url(const std::string& out_path);
 

src/sass_context.cpp

@@ -74,14 +74,14 @@ namespace Sass {
         // move line_beg pointer to line start
         while (line_beg && *line_beg && lines != 0) {
           if (*line_beg == '\n') --lines;
-          utf8::unchecked::next(line_beg); 
+          utf8::unchecked::next(line_beg);
         }
         const char* line_end = line_beg;
         // move line_end before next newline character
         while (line_end && *line_end && *line_end != '\n') {
           if (*line_end == '\n') break;
           if (*line_end == '\r') break;
-          utf8::unchecked::next(line_end); 
+          utf8::unchecked::next(line_end);
         }
         if (line_end && *line_end != 0) ++ line_end;
         size_t line_len = line_end - line_beg;
@@ -524,6 +524,7 @@ extern "C" {
     options->c_headers = 0;
     options->plugin_paths = 0;
     options->include_paths = 0;
+    options->extensions = 0;
   }
 
   // helper function, not exported, only accessible locally
@@ -558,6 +559,18 @@ extern "C" {
         cur = next;
       }
     }
+    // Deallocate extension
+    if (options->extensions) {
+      struct string_list* cur;
+      struct string_list* next;
+      cur = options->extensions;
+      while (cur) {
+        next = cur->next;
+        free(cur->string);
+        free(cur);
+        cur = next;
+      }
+    }
     // Free options strings
     free(options->input_path);
     free(options->output_path);
@@ -577,6 +590,7 @@ extern "C" {
     options->c_headers = 0;
     options->plugin_paths = 0;
     options->include_paths = 0;
+    options->extensions = 0;
   }
 
   // helper function, not exported, only accessible locally
@@ -713,6 +727,22 @@ extern "C" {
   IMPLEMENT_SASS_CONTEXT_TAKER(char*, source_map_string);
   IMPLEMENT_SASS_CONTEXT_TAKER(char**, included_files);
 
+  // Push function for import extenions
+  void ADDCALL sass_option_push_import_extension(struct Sass_Options* options, const char* ext)
+  {
+    struct string_list* extension = (struct string_list*) calloc(1, sizeof(struct string_list));
+    if (extension == 0) return;
+    extension->string = ext ? sass_copy_c_string(ext) : 0;
+    struct string_list* last = options->extensions;
+    if (!options->extensions) {
+      options->extensions = extension;
+    } else {
+      while (last->next)
+        last = last->next;
+      last->next = extension;
+    }
+  }
+
   // Push function for include paths (no manipulation support for now)
   void ADDCALL sass_option_push_include_path(struct Sass_Options* options, const char* path)
   {

src/sass_context.hpp

@@ -40,9 +40,12 @@ struct Sass_Options : Sass_Output_Options {
   // Colon-separated list of paths
   // Semicolon-separated on Windows
   // Maybe use array interface instead?
+  char* extension;
   char* include_path;
   char* plugin_path;
 
+  // Extensions (linked string list)
+  struct string_list* extensions;
   // Include paths (linked string list)
   struct string_list* include_paths;
   // Plugin paths (linked string list)
@@ -126,4 +129,4 @@ struct Sass_Compiler {
   Sass::Block_Obj root;
 };
 
-#endif
+#endif