aaac7fed
 liuqimichale
add
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## Example importer.c
```C
#include <stdio.h>
#include <string.h>
#include "sass/context.h"
Sass_Import_List sass_importer(const char* path, Sass_Importer_Entry cb, struct Sass_Compiler* comp)
{
// get the cookie from importer descriptor
void* cookie = sass_importer_get_cookie(cb);
Sass_Import_List list = sass_make_import_list(2);
char* local = sass_copy_c_string("local { color: green; }");
char* remote = sass_copy_c_string("remote { color: red; }");
list[0] = sass_make_import_entry("/tmp/styles.scss", local, 0);
list[1] = sass_make_import_entry("http://www.example.com", remote, 0);
return list;
}
int main( int argc, const char* argv[] )
{
// get the input file from first argument or use default
const char* input = argc > 1 ? argv[1] : "styles.scss";
// create the file context and get all related structs
struct Sass_File_Context* file_ctx = sass_make_file_context(input);
struct Sass_Context* ctx = sass_file_context_get_context(file_ctx);
struct Sass_Options* ctx_opt = sass_context_get_options(ctx);
// allocate custom importer
Sass_Importer_Entry c_imp =
sass_make_importer(sass_importer, 0, 0);
// create list for all custom importers
Sass_Importer_List imp_list = sass_make_importer_list(1);
// put only the importer on to the list
sass_importer_set_list_entry(imp_list, 0, c_imp);
// register list on to the context options
sass_option_set_c_importers(ctx_opt, imp_list);
// context is set up, call the compile step now
int status = sass_compile_file_context(file_ctx);
// print the result or the error to the stdout
if (status == 0) puts(sass_context_get_output_string(ctx));
else puts(sass_context_get_error_message(ctx));
// release allocated memory
sass_delete_file_context(file_ctx);
// exit status
return status;
}
```
Compile importer.c
```bash
gcc -c importer.c -o importer.o
gcc -o importer importer.o -lsass
echo "@import 'foobar';" > importer.scss
./importer importer.scss
```
## Importer Behavior Examples
```C
Sass_Import_List importer(const char* path, Sass_Importer_Entry cb, struct Sass_Compiler* comp) {
// let LibSass handle the import request
return NULL;
}
Sass_Import_List importer(const char* path, Sass_Importer_Entry cb, struct Sass_Compiler* comp) {
// let LibSass handle the request
// swallows »@import "http://…"« pass-through
// (arguably a bug)
Sass_Import_List list = sass_make_import_list(1);
list[0] = sass_make_import_entry(path, 0, 0);
return list;
}
Sass_Import_List importer(const char* path, Sass_Importer_Entry cb, struct Sass_Compiler* comp) {
// return an error to halt execution
Sass_Import_List list = sass_make_import_list(1);
const char* message = "some error message";
list[0] = sass_make_import_entry(path, 0, 0);
sass_import_set_error(list[0], sass_copy_c_string(message), 0, 0);
return list;
}
Sass_Import_List importer(const char* path, Sass_Importer_Entry cb, struct Sass_Compiler* comp) {
// let LibSass load the file identifed by the importer
Sass_Import_List list = sass_make_import_list(1);
list[0] = sass_make_import_entry("/tmp/file.scss", 0, 0);
return list;
}
Sass_Import_List importer(const char* path, Sass_Importer_Entry cb, struct Sass_Compiler* comp) {
// completely hide the import
// (arguably a bug)
Sass_Import_List list = sass_make_import_list(0);
return list;
}
Sass_Import_List importer(const char* path, Sass_Importer_Entry cb, struct Sass_Compiler* comp) {
// completely hide the import
// (arguably a bug)
Sass_Import_List list = sass_make_import_list(1);
list[0] = sass_make_import_entry(0, 0, 0);
return list;
}
```
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