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-# Developer Documentation
-
-Custom functions are internally represented by `struct Sass_C_Function_Descriptor`.
-
-## Sass_C_Function_Descriptor
-
-```C
-struct Sass_C_Function_Descriptor {
-  const char*      signature;
-  Sass_C_Function  function;
-  void*            cookie;
-};
-```
-
-- `signature`: The function declaration, like `foo($bar, $baz:1)`
-- `function`:  Reference to the C function callback
-- `cookie`:    any pointer you want to attach
-
-### signature
-
-The signature defines how the function can be invoked. It also declares which arguments are required and which are optional.  Required arguments will be enforced by LibSass and a Sass error is thrown in the event a call as missing an argument. Optional arguments only need to be present when you want to overwrite the default value.
-
-    foo($bar, $baz: 2)
-
-In this example, `$bar` is required and will error if not passed. `$baz` is optional and the default value of it is 2. A call like `foo(10)` is therefore equal to `foo(10, 2)`, while `foo()` will produce an error.
-
-### function
-
-The callback function needs to be of the following form:
-
-```C
-union Sass_Value* call_sass_function(
-    const union Sass_Value* s_args,
-    void*                   cookie
-) {
-  return sass_clone_value(s_args);
-}
-```
-
-### cookie
-
-The cookie can hold any pointer you want. In the `perl-libsass` implementation it holds the structure with the reference of the actual registered callback into the perl interpreter. Before that call `perl-libsass` will convert all `Sass_Values` to corresponding perl data types (so they can be used natively inside the perl interpretor). The callback can also return a `Sass_Value`. In `perl-libsass` the actual function returns a perl value, which has to be converted before `libsass` can work with it again!
-
-## Sass_Values
-
-```C
-// allocate memory (copies passed strings)
-union Sass_Value* sass_make_null    (void);
-union Sass_Value* sass_make_boolean (bool val);
-union Sass_Value* sass_make_string  (const char* val);
-union Sass_Value* sass_make_qstring (const char* val);
-union Sass_Value* sass_make_number  (double val, const char* unit);
-union Sass_Value* sass_make_color   (double r, double g, double b, double a);
-union Sass_Value* sass_make_list    (size_t len, enum Sass_Separator sep, bool is_bracketed);
-union Sass_Value* sass_make_map     (size_t len);
-union Sass_Value* sass_make_error   (const char* msg);
-union Sass_Value* sass_make_warning (const char* msg);
-
-// Make a deep cloned copy of the given sass value
-union Sass_Value* sass_clone_value (const union Sass_Value* val);
-
-// deallocate memory (incl. all copied memory)
-void sass_delete_value (const union Sass_Value* val);
-```
-
-## Example main.c
-
-```C
-#include <stdio.h>
-#include <stdint.h>
-#include "sass/context.h"
-
-union Sass_Value* call_fn_foo(const union Sass_Value* s_args, void* cookie)
-{
-  // we actually abuse the void* to store an "int"
-  return sass_make_number((size_t)cookie, "px");
-}
-
-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 a custom function caller
-  Sass_C_Function_Callback fn_foo =
-    sass_make_function("foo()", call_fn_foo, (void*)42);
-
-  // create list of all custom functions
-  Sass_C_Function_List fn_list = sass_make_function_list(1);
-  sass_function_set_list_entry(fn_list, 0, fn_foo);
-  sass_option_set_c_functions(ctx_opt, fn_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 main.c
-
-```bash
-gcc -c main.c -o main.o
-gcc -o sample main.o -lsass
-echo "foo { margin: foo(); }" > foo.scss
-./sample foo.scss => "foo { margin: 42px }"
-```