123use std::{4 any::Any,5 cell::RefCell,6 collections::HashMap,7 ffi::{c_void, CStr, CString},8 fs::File,9 io::Read,10 os::raw::{c_char, c_int},11 path::{Path, PathBuf},12 ptr::null_mut,13};1415use jrsonnet_evaluator::{16 error::{Error::*, Result},17 throw, ImportResolver, State,18};1920pub type JsonnetImportCallback = unsafe extern "C" fn(21 ctx: *mut c_void,22 base: *const c_char,23 rel: *const c_char,24 found_here: *mut *const c_char,25 success: &mut c_int,26) -> *mut c_char;272829pub struct CallbackImportResolver {30 cb: JsonnetImportCallback,31 ctx: *mut c_void,32 out: RefCell<HashMap<PathBuf, Vec<u8>>>,33}34impl ImportResolver for CallbackImportResolver {35 fn resolve_file(&self, from: &Path, path: &str) -> Result<PathBuf> {36 let base = CString::new(from.to_str().unwrap()).unwrap().into_raw();37 let rel = CString::new(path).unwrap().into_raw();38 let found_here: *mut c_char = null_mut();39 let mut success: i32 = 0;40 let result_ptr = unsafe {41 (self.cb)(42 self.ctx,43 base,44 rel,45 &mut (found_here as *const _),46 &mut success,47 )48 };49 50 unsafe {51 let _ = CString::from_raw(base);52 let _ = CString::from_raw(rel);53 }54 let result_raw = unsafe { CStr::from_ptr(result_ptr) };55 let result_str = result_raw.to_str().unwrap();56 assert!(success == 0 || success == 1);57 if success == 0 {58 unsafe { CString::from_raw(result_ptr) };59 let result = result_str.to_owned();60 throw!(ImportCallbackError(result));61 }6263 let found_here_raw = unsafe { CStr::from_ptr(found_here) };64 let found_here_buf = PathBuf::from(found_here_raw.to_str().unwrap());65 unsafe {66 let _ = CString::from_raw(found_here);67 }6869 let mut out = self.out.borrow_mut();70 if !out.contains_key(&found_here_buf) {71 out.insert(found_here_buf.clone(), result_str.into());72 unsafe { CString::from_raw(result_ptr) };73 }7475 Ok(found_here_buf)76 }77 fn load_file_contents(&self, resolved: &Path) -> Result<Vec<u8>> {78 Ok(self.out.borrow().get(resolved).unwrap().clone())79 }8081 unsafe fn as_any(&self) -> &dyn Any {82 self83 }84}858687#[no_mangle]88pub unsafe extern "C" fn jsonnet_import_callback(89 vm: &State,90 cb: JsonnetImportCallback,91 ctx: *mut c_void,92) {93 vm.set_import_resolver(Box::new(CallbackImportResolver {94 cb,95 ctx,96 out: RefCell::new(HashMap::new()),97 }))98}99100101#[derive(Default)]102pub struct NativeImportResolver {103 library_paths: RefCell<Vec<PathBuf>>,104}105impl NativeImportResolver {106 fn add_jpath(&self, path: PathBuf) {107 self.library_paths.borrow_mut().push(path);108 }109}110impl ImportResolver for NativeImportResolver {111 fn resolve_file(&self, from: &Path, path: &str) -> Result<PathBuf> {112 let mut new_path = from.to_owned();113 new_path.push(path);114 if new_path.exists() {115 Ok(new_path)116 } else {117 for library_path in self.library_paths.borrow().iter() {118 let mut cloned = library_path.clone();119 cloned.push(path);120 if cloned.exists() {121 return Ok(cloned);122 }123 }124 throw!(ImportFileNotFound(from.to_owned(), path.to_owned()))125 }126 }127 fn load_file_contents(&self, id: &Path) -> Result<Vec<u8>> {128 let mut file = File::open(id).map_err(|_e| ResolvedFileNotFound(id.to_owned()))?;129 let mut out = Vec::new();130 file.read_to_end(&mut out)131 .map_err(|e| ImportIo(e.to_string()))?;132 Ok(out)133 }134 unsafe fn as_any(&self) -> &dyn Any {135 self136 }137}138139140141142#[no_mangle]143pub unsafe extern "C" fn jsonnet_jpath_add(vm: &State, v: *const c_char) {144 let cstr = CStr::from_ptr(v);145 let path = PathBuf::from(cstr.to_str().unwrap());146 let any_resolver = vm.import_resolver();147 let resolver = any_resolver148 .as_any()149 .downcast_ref::<NativeImportResolver>()150 .expect("jpaths are not compatible with callback imports!");151 resolver.add_jpath(path);152}