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neovim/src/nvim/lua/executor.c

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// This is an open source non-commercial project. Dear PVS-Studio, please check
// it. PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
#include <lua.h>
#include <lualib.h>
#include <lauxlib.h>
#include "nvim/misc1.h"
#include "nvim/getchar.h"
#include "nvim/garray.h"
#include "nvim/func_attr.h"
#include "nvim/api/private/defs.h"
#include "nvim/api/private/helpers.h"
#include "nvim/api/vim.h"
#include "nvim/msgpack_rpc/channel.h"
#include "nvim/vim.h"
#include "nvim/ex_getln.h"
#include "nvim/ex_cmds2.h"
#include "nvim/message.h"
#include "nvim/memline.h"
#include "nvim/buffer_defs.h"
#include "nvim/macros.h"
#include "nvim/screen.h"
#include "nvim/cursor.h"
#include "nvim/undo.h"
#include "nvim/ascii.h"
#include "nvim/change.h"
#ifdef WIN32
#include "nvim/os/os.h"
#endif
#include "nvim/lua/executor.h"
#include "nvim/lua/converter.h"
#include "nvim/lua/treesitter.h"
#include "luv/luv.h"
static int in_fast_callback = 0;
typedef struct {
Error err;
String lua_err_str;
} LuaError;
#ifdef INCLUDE_GENERATED_DECLARATIONS
# include "lua/vim_module.generated.h"
# include "lua/executor.c.generated.h"
#endif
/// Convert lua error into a Vim error message
///
/// @param lstate Lua interpreter state.
/// @param[in] msg Message base, must contain one `%s`.
static void nlua_error(lua_State *const lstate, const char *const msg)
FUNC_ATTR_NONNULL_ALL
{
size_t len;
const char *const str = lua_tolstring(lstate, -1, &len);
msg_ext_set_kind("lua_error");
emsgf_multiline(msg, (int)len, str);
lua_pop(lstate, 1);
}
/// Compare two strings, ignoring case
///
/// Expects two values on the stack: compared strings. Returns one of the
/// following numbers: 0, -1 or 1.
///
/// Does no error handling: never call it with non-string or with some arguments
/// omitted.
static int nlua_stricmp(lua_State *const lstate) FUNC_ATTR_NONNULL_ALL
{
size_t s1_len;
size_t s2_len;
const char *s1 = luaL_checklstring(lstate, 1, &s1_len);
const char *s2 = luaL_checklstring(lstate, 2, &s2_len);
char *nul1;
char *nul2;
int ret = 0;
assert(s1[s1_len] == NUL);
assert(s2[s2_len] == NUL);
do {
nul1 = memchr(s1, NUL, s1_len);
nul2 = memchr(s2, NUL, s2_len);
ret = STRICMP(s1, s2);
if (ret == 0) {
// Compare "a\0" greater then "a".
if ((nul1 == NULL) != (nul2 == NULL)) {
ret = ((nul1 != NULL) - (nul2 != NULL));
break;
}
if (nul1 != NULL) {
assert(nul2 != NULL);
// Can't shift both strings by the same amount of bytes: lowercase
// letter may have different byte-length than uppercase.
s1_len -= (size_t)(nul1 - s1) + 1;
s2_len -= (size_t)(nul2 - s2) + 1;
s1 = nul1 + 1;
s2 = nul2 + 1;
} else {
break;
}
} else {
break;
}
} while (true);
lua_pop(lstate, 2);
lua_pushnumber(lstate, (lua_Number)((ret > 0) - (ret < 0)));
return 1;
}
/// convert byte index to UTF-32 and UTF-16 indicies
///
/// Expects a string and an optional index. If no index is supplied, the length
/// of the string is returned.
///
/// Returns two values: the UTF-32 and UTF-16 indicies.
static int nlua_str_utfindex(lua_State *const lstate) FUNC_ATTR_NONNULL_ALL
{
size_t s1_len;
const char *s1 = luaL_checklstring(lstate, 1, &s1_len);
intptr_t idx;
if (lua_gettop(lstate) >= 2) {
idx = luaL_checkinteger(lstate, 2);
if (idx < 0 || idx > (intptr_t)s1_len) {
return luaL_error(lstate, "index out of range");
}
} else {
idx = (intptr_t)s1_len;
}
size_t codepoints = 0, codeunits = 0;
mb_utflen((const char_u *)s1, (size_t)idx, &codepoints, &codeunits);
lua_pushinteger(lstate, (long)codepoints);
lua_pushinteger(lstate, (long)codeunits);
return 2;
}
/// convert UTF-32 or UTF-16 indicies to byte index.
///
/// Expects up to three args: string, index and use_utf16.
/// If use_utf16 is not supplied it defaults to false (use UTF-32)
///
/// Returns the byte index.
static int nlua_str_byteindex(lua_State *const lstate) FUNC_ATTR_NONNULL_ALL
{
size_t s1_len;
const char *s1 = luaL_checklstring(lstate, 1, &s1_len);
intptr_t idx = luaL_checkinteger(lstate, 2);
if (idx < 0) {
return luaL_error(lstate, "index out of range");
}
bool use_utf16 = false;
if (lua_gettop(lstate) >= 3) {
use_utf16 = lua_toboolean(lstate, 3);
}
ssize_t byteidx = mb_utf_index_to_bytes((const char_u *)s1, s1_len,
(size_t)idx, use_utf16);
if (byteidx == -1) {
return luaL_error(lstate, "index out of range");
}
lua_pushinteger(lstate, (long)byteidx);
return 1;
}
static void nlua_luv_error_event(void **argv)
{
char *error = (char *)argv[0];
msg_ext_set_kind("lua_error");
emsgf_multiline("Error executing luv callback:\n%s", error);
xfree(error);
}
static int nlua_luv_cfpcall(lua_State *lstate, int nargs, int nresult,
int flags)
FUNC_ATTR_NONNULL_ALL
{
int retval;
// luv callbacks might be executed at any os_breakcheck/line_breakcheck
// call, so using the API directly here is not safe.
in_fast_callback++;
int top = lua_gettop(lstate);
int status = lua_pcall(lstate, nargs, nresult, 0);
if (status) {
if (status == LUA_ERRMEM && !(flags & LUVF_CALLBACK_NOEXIT)) {
// consider out of memory errors unrecoverable, just like xmalloc()
mch_errmsg(e_outofmem);
mch_errmsg("\n");
preserve_exit();
}
const char *error = lua_tostring(lstate, -1);
multiqueue_put(main_loop.events, nlua_luv_error_event,
1, xstrdup(error));
lua_pop(lstate, 1); // error mesage
retval = -status;
} else { // LUA_OK
if (nresult == LUA_MULTRET) {
nresult = lua_gettop(lstate) - top + nargs + 1;
}
retval = nresult;
}
in_fast_callback--;
return retval;
}
static void nlua_schedule_event(void **argv)
{
LuaRef cb = (LuaRef)(ptrdiff_t)argv[0];
lua_State *const lstate = nlua_enter();
nlua_pushref(lstate, cb);
nlua_unref(lstate, cb);
if (lua_pcall(lstate, 0, 0, 0)) {
nlua_error(lstate, _("Error executing vim.schedule lua callback: %.*s"));
}
}
/// Schedule Lua callback on main loop's event queue
///
/// @param lstate Lua interpreter state.
static int nlua_schedule(lua_State *const lstate)
FUNC_ATTR_NONNULL_ALL
{
if (lua_type(lstate, 1) != LUA_TFUNCTION) {
lua_pushliteral(lstate, "vim.schedule: expected function");
return lua_error(lstate);
}
LuaRef cb = nlua_ref(lstate, 1);
multiqueue_put(main_loop.events, nlua_schedule_event,
1, (void *)(ptrdiff_t)cb);
return 0;
}
/// Initialize lua interpreter state
///
/// Called by lua interpreter itself to initialize state.
static int nlua_state_init(lua_State *const lstate) FUNC_ATTR_NONNULL_ALL
{
// print
lua_pushcfunction(lstate, &nlua_print);
lua_setglobal(lstate, "print");
// debug.debug
lua_getglobal(lstate, "debug");
lua_pushcfunction(lstate, &nlua_debug);
lua_setfield(lstate, -2, "debug");
lua_pop(lstate, 1);
#ifdef WIN32
// os.getenv
lua_getglobal(lstate, "os");
lua_pushcfunction(lstate, &nlua_getenv);
lua_setfield(lstate, -2, "getenv");
lua_pop(lstate, 1);
#endif
// vim
lua_newtable(lstate);
// vim.api
nlua_add_api_functions(lstate);
// vim.types, vim.type_idx, vim.val_idx
nlua_init_types(lstate);
// stricmp
lua_pushcfunction(lstate, &nlua_stricmp);
lua_setfield(lstate, -2, "stricmp");
// str_utfindex
lua_pushcfunction(lstate, &nlua_str_utfindex);
lua_setfield(lstate, -2, "str_utfindex");
// str_byteindex
lua_pushcfunction(lstate, &nlua_str_byteindex);
lua_setfield(lstate, -2, "str_byteindex");
// schedule
lua_pushcfunction(lstate, &nlua_schedule);
lua_setfield(lstate, -2, "schedule");
// in_fast_event
lua_pushcfunction(lstate, &nlua_in_fast_event);
lua_setfield(lstate, -2, "in_fast_event");
// call
lua_pushcfunction(lstate, &nlua_call);
lua_setfield(lstate, -2, "call");
// rpcrequest
lua_pushcfunction(lstate, &nlua_rpcrequest);
lua_setfield(lstate, -2, "rpcrequest");
// rpcnotify
lua_pushcfunction(lstate, &nlua_rpcnotify);
lua_setfield(lstate, -2, "rpcnotify");
// vim.loop
luv_set_loop(lstate, &main_loop.uv);
luv_set_callback(lstate, nlua_luv_cfpcall);
luaopen_luv(lstate);
lua_pushvalue(lstate, -1);
lua_setfield(lstate, -3, "loop");
// package.loaded.luv = vim.loop
// otherwise luv will be reinitialized when require'luv'
lua_getglobal(lstate, "package");
lua_getfield(lstate, -1, "loaded");
lua_pushvalue(lstate, -3);
lua_setfield(lstate, -2, "luv");
lua_pop(lstate, 3);
// vim.NIL
lua_newuserdata(lstate, 0);
lua_createtable(lstate, 0, 0);
lua_pushcfunction(lstate, &nlua_nil_tostring);
lua_setfield(lstate, -2, "__tostring");
lua_setmetatable(lstate, -2);
nlua_nil_ref = nlua_ref(lstate, -1);
lua_setfield(lstate, -2, "NIL");
// internal vim._treesitter... API
nlua_add_treesitter(lstate);
lua_setglobal(lstate, "vim");
{
const char *code = (char *)&shared_module[0];
if (luaL_loadbuffer(lstate, code, strlen(code), "@shared.lua")
|| lua_pcall(lstate, 0, 0, 0)) {
nlua_error(lstate, _("E5106: Error while creating shared module: %.*s"));
return 1;
}
}
{
const char *code = (char *)&vim_module[0];
if (luaL_loadbuffer(lstate, code, strlen(code), "@vim.lua")
|| lua_pcall(lstate, 0, 0, 0)) {
nlua_error(lstate, _("E5106: Error while creating vim module: %.*s"));
return 1;
}
}
return 0;
}
/// Initialize lua interpreter
///
/// Crashes Nvim if initialization fails. Should be called once per lua
/// interpreter instance.
///
/// @return New lua interpreter instance.
static lua_State *nlua_init(void)
FUNC_ATTR_NONNULL_RET FUNC_ATTR_WARN_UNUSED_RESULT
{
lua_State *lstate = luaL_newstate();
if (lstate == NULL) {
EMSG(_("E970: Failed to initialize lua interpreter"));
preserve_exit();
}
luaL_openlibs(lstate);
nlua_state_init(lstate);
return lstate;
}
/// Enter lua interpreter
///
/// Calls nlua_init() if needed. Is responsible for pre-lua call initalization
/// like updating `package.[c]path` with directories derived from &runtimepath.
///
/// @return Interpreter instance to use. Will either be initialized now or
/// taken from previous initialization.
static lua_State *nlua_enter(void)
FUNC_ATTR_NONNULL_RET FUNC_ATTR_WARN_UNUSED_RESULT
{
static lua_State *global_lstate = NULL;
if (global_lstate == NULL) {
global_lstate = nlua_init();
}
lua_State *const lstate = global_lstate;
// Last used p_rtp value. Must not be dereferenced because value pointed to
// may already be freed. Used to check whether &runtimepath option value
// changed.
static const void *last_p_rtp = NULL;
if (last_p_rtp != (const void *)p_rtp) {
// stack: (empty)
lua_getglobal(lstate, "vim");
// stack: vim
lua_getfield(lstate, -1, "_update_package_paths");
// stack: vim, vim._update_package_paths
if (lua_pcall(lstate, 0, 0, 0)) {
// stack: vim, error
nlua_error(lstate, _("E5117: Error while updating package paths: %.*s"));
// stack: vim
}
// stack: vim
lua_pop(lstate, 1);
// stack: (empty)
last_p_rtp = (const void *)p_rtp;
}
return lstate;
}
static void nlua_print_event(void **argv)
{
char *str = argv[0];
const size_t len = (size_t)(intptr_t)argv[1]-1; // exclude final NUL
for (size_t i = 0; i < len;) {
const size_t start = i;
while (i < len) {
switch (str[i]) {
case NUL: {
str[i] = NL;
i++;
continue;
}
case NL: {
// TODO(bfredl): use proper multiline msg? Probably should implement
// print() in lua in terms of nvim_message(), when it is available.
str[i] = NUL;
i++;
break;
}
default: {
i++;
continue;
}
}
break;
}
msg((char_u *)str + start);
}
if (len && str[len - 1] == NUL) { // Last was newline
msg((char_u *)"");
}
xfree(str);
}
/// Print as a Vim message
///
/// @param lstate Lua interpreter state.
static int nlua_print(lua_State *const lstate)
FUNC_ATTR_NONNULL_ALL
{
#define PRINT_ERROR(msg) \
do { \
errmsg = msg; \
errmsg_len = sizeof(msg) - 1; \
goto nlua_print_error; \
} while (0)
const int nargs = lua_gettop(lstate);
lua_getglobal(lstate, "tostring");
const char *errmsg = NULL;
size_t errmsg_len = 0;
garray_T msg_ga;
ga_init(&msg_ga, 1, 80);
int curargidx = 1;
for (; curargidx <= nargs; curargidx++) {
lua_pushvalue(lstate, -1); // tostring
lua_pushvalue(lstate, curargidx); // arg
if (lua_pcall(lstate, 1, 1, 0)) {
errmsg = lua_tolstring(lstate, -1, &errmsg_len);
goto nlua_print_error;
}
size_t len;
const char *const s = lua_tolstring(lstate, -1, &len);
if (s == NULL) {
PRINT_ERROR(
"<Unknown error: lua_tolstring returned NULL for tostring result>");
}
ga_concat_len(&msg_ga, s, len);
if (curargidx < nargs) {
ga_append(&msg_ga, ' ');
}
lua_pop(lstate, 1);
}
#undef PRINT_ERROR
ga_append(&msg_ga, NUL);
if (in_fast_callback) {
multiqueue_put(main_loop.events, nlua_print_event,
2, msg_ga.ga_data, msg_ga.ga_len);
} else {
nlua_print_event((void *[]){ msg_ga.ga_data,
(void *)(intptr_t)msg_ga.ga_len });
}
return 0;
nlua_print_error:
ga_clear(&msg_ga);
const char *fmt = _("E5114: Error while converting print argument #%i: %.*s");
size_t len = (size_t)vim_snprintf((char *)IObuff, IOSIZE, fmt, curargidx,
(int)errmsg_len, errmsg);
lua_pushlstring(lstate, (char *)IObuff, len);
return lua_error(lstate);
}
/// debug.debug: interaction with user while debugging.
///
/// @param lstate Lua interpreter state.
int nlua_debug(lua_State *lstate)
FUNC_ATTR_NONNULL_ALL
{
const typval_T input_args[] = {
{
.v_lock = VAR_FIXED,
.v_type = VAR_STRING,
.vval.v_string = (char_u *)"lua_debug> ",
},
{
.v_type = VAR_UNKNOWN,
},
};
for (;;) {
lua_settop(lstate, 0);
typval_T input;
get_user_input(input_args, &input, false);
msg_putchar('\n'); // Avoid outputting on input line.
if (input.v_type != VAR_STRING
|| input.vval.v_string == NULL
|| *input.vval.v_string == NUL
|| STRCMP(input.vval.v_string, "cont") == 0) {
tv_clear(&input);
return 0;
}
if (luaL_loadbuffer(lstate, (const char *)input.vval.v_string,
STRLEN(input.vval.v_string), "=(debug command)")) {
nlua_error(lstate, _("E5115: Error while loading debug string: %.*s"));
} else if (lua_pcall(lstate, 0, 0, 0)) {
nlua_error(lstate, _("E5116: Error while calling debug string: %.*s"));
}
tv_clear(&input);
}
return 0;
}
int nlua_in_fast_event(lua_State *lstate)
{
lua_pushboolean(lstate, in_fast_callback > 0);
return 1;
}
int nlua_call(lua_State *lstate)
{
Error err = ERROR_INIT;
size_t name_len;
const char_u *name = (const char_u *)luaL_checklstring(lstate, 1, &name_len);
if (!nlua_is_deferred_safe(lstate)) {
return luaL_error(lstate, e_luv_api_disabled, "vimL function");
}
int nargs = lua_gettop(lstate)-1;
if (nargs > MAX_FUNC_ARGS) {
return luaL_error(lstate, "Function called with too many arguments");
}
typval_T vim_args[MAX_FUNC_ARGS + 1];
int i = 0; // also used for freeing the variables
for (; i < nargs; i++) {
lua_pushvalue(lstate, (int)i+2);
if (!nlua_pop_typval(lstate, &vim_args[i])) {
api_set_error(&err, kErrorTypeException,
"error converting argument %d", i+1);
goto free_vim_args;
}
}
TRY_WRAP({
// TODO(bfredl): this should be simplified in error handling refactor
force_abort = false;
suppress_errthrow = false;
current_exception = NULL;
did_emsg = false;
try_start();
typval_T rettv;
int dummy;
// call_func() retval is deceptive, ignore it. Instead we set `msg_list`
// (TRY_WRAP) to capture abort-causing non-exception errors.
(void)call_func(name, (int)name_len, &rettv, nargs,
vim_args, NULL, curwin->w_cursor.lnum, curwin->w_cursor.lnum,
&dummy, true, NULL, NULL);
if (!try_end(&err)) {
nlua_push_typval(lstate, &rettv, false);
}
tv_clear(&rettv);
});
free_vim_args:
while (i > 0) {
tv_clear(&vim_args[--i]);
}
if (ERROR_SET(&err)) {
lua_pushstring(lstate, err.msg);
api_clear_error(&err);
return lua_error(lstate);
}
return 1;
}
static int nlua_rpcrequest(lua_State *lstate)
{
if (!nlua_is_deferred_safe(lstate)) {
return luaL_error(lstate, e_luv_api_disabled, "rpcrequest");
}
return nlua_rpc(lstate, true);
}
static int nlua_rpcnotify(lua_State *lstate)
{
return nlua_rpc(lstate, false);
}
static int nlua_rpc(lua_State *lstate, bool request)
{
size_t name_len;
uint64_t chan_id = (uint64_t)luaL_checkinteger(lstate, 1);
const char *name = luaL_checklstring(lstate, 2, &name_len);
int nargs = lua_gettop(lstate)-2;
Error err = ERROR_INIT;
Array args = ARRAY_DICT_INIT;
for (int i = 0; i < nargs; i++) {
lua_pushvalue(lstate, (int)i+3);
ADD(args, nlua_pop_Object(lstate, false, &err));
if (ERROR_SET(&err)) {
api_free_array(args);
goto check_err;
}
}
if (request) {
Object result = rpc_send_call(chan_id, name, args, &err);
if (!ERROR_SET(&err)) {
nlua_push_Object(lstate, result, false);
api_free_object(result);
}
} else {
if (!rpc_send_event(chan_id, name, args)) {
api_set_error(&err, kErrorTypeValidation,
"Invalid channel: %"PRIu64, chan_id);
}
}
check_err:
if (ERROR_SET(&err)) {
lua_pushstring(lstate, err.msg);
api_clear_error(&err);
return lua_error(lstate);
}
return request ? 1 : 0;
}
static int nlua_nil_tostring(lua_State *lstate)
{
lua_pushstring(lstate, "vim.NIL");
return 1;
}
#ifdef WIN32
/// os.getenv: override os.getenv to maintain coherency. #9681
///
/// uv_os_setenv uses SetEnvironmentVariableW which does not update _environ.
///
/// @param lstate Lua interpreter state.
static int nlua_getenv(lua_State *lstate)
{
lua_pushstring(lstate, os_getenv(luaL_checkstring(lstate, 1)));
return 1;
}
#endif
/// add the value to the registry
LuaRef nlua_ref(lua_State *lstate, int index)
{
lua_pushvalue(lstate, index);
return luaL_ref(lstate, LUA_REGISTRYINDEX);
}
/// remove the value from the registry
void nlua_unref(lua_State *lstate, LuaRef ref)
{
if (ref > 0) {
luaL_unref(lstate, LUA_REGISTRYINDEX, ref);
}
}
void executor_free_luaref(LuaRef ref)
{
lua_State *const lstate = nlua_enter();
nlua_unref(lstate, ref);
}
/// push a value referenced in the regirstry
void nlua_pushref(lua_State *lstate, LuaRef ref)
{
lua_rawgeti(lstate, LUA_REGISTRYINDEX, ref);
}
/// Evaluate lua string
///
/// Used for luaeval().
///
/// @param[in] str String to execute.
/// @param[in] arg Second argument to `luaeval()`.
/// @param[out] ret_tv Location where result will be saved.
///
/// @return Result of the execution.
void executor_eval_lua(const String str, typval_T *const arg,
typval_T *const ret_tv)
FUNC_ATTR_NONNULL_ALL
{
#define EVALHEADER "local _A=select(1,...) return ("
const size_t lcmd_len = sizeof(EVALHEADER) - 1 + str.size + 1;
char *lcmd;
if (lcmd_len < IOSIZE) {
lcmd = (char *)IObuff;
} else {
lcmd = xmalloc(lcmd_len);
}
memcpy(lcmd, EVALHEADER, sizeof(EVALHEADER) - 1);
memcpy(lcmd + sizeof(EVALHEADER) - 1, str.data, str.size);
lcmd[lcmd_len - 1] = ')';
#undef EVALHEADER
typval_exec_lua(lcmd, lcmd_len, "luaeval()", arg, 1, true, ret_tv);
if (lcmd != (char *)IObuff) {
xfree(lcmd);
}
}
void executor_call_lua(const char *str, size_t len, typval_T *const args,
int argcount, typval_T *ret_tv)
FUNC_ATTR_NONNULL_ALL
{
#define CALLHEADER "return "
#define CALLSUFFIX "(...)"
const size_t lcmd_len = sizeof(CALLHEADER) - 1 + len + sizeof(CALLSUFFIX) - 1;
char *lcmd;
if (lcmd_len < IOSIZE) {
lcmd = (char *)IObuff;
} else {
lcmd = xmalloc(lcmd_len);
}
memcpy(lcmd, CALLHEADER, sizeof(CALLHEADER) - 1);
memcpy(lcmd + sizeof(CALLHEADER) - 1, str, len);
memcpy(lcmd + sizeof(CALLHEADER) - 1 + len, CALLSUFFIX,
sizeof(CALLSUFFIX) - 1);
#undef CALLHEADER
#undef CALLSUFFIX
typval_exec_lua(lcmd, lcmd_len, "v:lua", args, argcount, false, ret_tv);
if (lcmd != (char *)IObuff) {
xfree(lcmd);
}
}
static void typval_exec_lua(const char *lcmd, size_t lcmd_len, const char *name,
typval_T *const args, int argcount, bool special,
typval_T *ret_tv)
{
if (check_restricted() || check_secure()) {
ret_tv->v_type = VAR_NUMBER;
ret_tv->vval.v_number = 0;
return;
}
lua_State *const lstate = nlua_enter();
if (luaL_loadbuffer(lstate, lcmd, lcmd_len, name)) {
nlua_error(lstate, _("E5107: Error loading lua %.*s"));
return;
}
for (int i = 0; i < argcount; i++) {
if (args[i].v_type == VAR_UNKNOWN) {
lua_pushnil(lstate);
} else {
nlua_push_typval(lstate, &args[i], special);
}
}
if (lua_pcall(lstate, argcount, ret_tv ? 1 : 0, 0)) {
nlua_error(lstate, _("E5108: Error executing lua %.*s"));
return;
}
if (ret_tv) {
nlua_pop_typval(lstate, ret_tv);
}
}
/// Execute Lua string
///
/// Used for nvim_exec_lua().
///
/// @param[in] str String to execute.
/// @param[in] args array of ... args
/// @param[out] err Location where error will be saved.
///
/// @return Return value of the execution.
Object executor_exec_lua_api(const String str, const Array args, Error *err)
{
lua_State *const lstate = nlua_enter();
if (luaL_loadbuffer(lstate, str.data, str.size, "<nvim>")) {
size_t len;
const char *errstr = lua_tolstring(lstate, -1, &len);
api_set_error(err, kErrorTypeValidation,
"Error loading lua: %.*s", (int)len, errstr);
return NIL;
}
for (size_t i = 0; i < args.size; i++) {
nlua_push_Object(lstate, args.items[i], false);
}
if (lua_pcall(lstate, (int)args.size, 1, 0)) {
size_t len;
const char *errstr = lua_tolstring(lstate, -1, &len);
api_set_error(err, kErrorTypeException,
"Error executing lua: %.*s", (int)len, errstr);
return NIL;
}
return nlua_pop_Object(lstate, false, err);
}
Object executor_exec_lua_cb(LuaRef ref, const char *name, Array args,
bool retval, Error *err)
{
lua_State *const lstate = nlua_enter();
nlua_pushref(lstate, ref);
lua_pushstring(lstate, name);
for (size_t i = 0; i < args.size; i++) {
nlua_push_Object(lstate, args.items[i], false);
}
if (lua_pcall(lstate, (int)args.size+1, retval ? 1 : 0, 0)) {
// if err is passed, the caller will deal with the error.
if (err) {
size_t len;
const char *errstr = lua_tolstring(lstate, -1, &len);
api_set_error(err, kErrorTypeException,
"Error executing lua: %.*s", (int)len, errstr);
} else {
nlua_error(lstate, _("Error executing lua callback: %.*s"));
}
return NIL;
}
if (retval) {
Error dummy = ERROR_INIT;
if (err == NULL) {
err = &dummy;
}
return nlua_pop_Object(lstate, false, err);
} else {
return NIL;
}
}
/// check if the current execution context is safe for calling deferred API
/// methods. Luv callbacks are unsafe as they are called inside the uv loop.
bool nlua_is_deferred_safe(lua_State *lstate)
{
return in_fast_callback == 0;
}
/// Run lua string
///
/// Used for :lua.
///
/// @param eap VimL command being run.
void ex_lua(exarg_T *const eap)
FUNC_ATTR_NONNULL_ALL
{
size_t len;
char *const code = script_get(eap, &len);
if (eap->skip) {
xfree(code);
return;
}
typval_exec_lua(code, len, ":lua", NULL, 0, false, NULL);
xfree(code);
}
/// Run lua string for each line in range
///
/// Used for :luado.
///
/// @param eap VimL command being run.
void ex_luado(exarg_T *const eap)
FUNC_ATTR_NONNULL_ALL
{
if (u_save(eap->line1 - 1, eap->line2 + 1) == FAIL) {
EMSG(_("cannot save undo information"));
return;
}
const char *const cmd = (const char *)eap->arg;
const size_t cmd_len = strlen(cmd);
lua_State *const lstate = nlua_enter();
#define DOSTART "return function(line, linenr) "
#define DOEND " end"
const size_t lcmd_len = (cmd_len
+ (sizeof(DOSTART) - 1)
+ (sizeof(DOEND) - 1));
char *lcmd;
if (lcmd_len < IOSIZE) {
lcmd = (char *)IObuff;
} else {
lcmd = xmalloc(lcmd_len + 1);
}
memcpy(lcmd, DOSTART, sizeof(DOSTART) - 1);
memcpy(lcmd + sizeof(DOSTART) - 1, cmd, cmd_len);
memcpy(lcmd + sizeof(DOSTART) - 1 + cmd_len, DOEND, sizeof(DOEND) - 1);
#undef DOSTART
#undef DOEND
if (luaL_loadbuffer(lstate, lcmd, lcmd_len, ":luado")) {
nlua_error(lstate, _("E5109: Error loading lua: %.*s"));
if (lcmd_len >= IOSIZE) {
xfree(lcmd);
}
return;
}
if (lcmd_len >= IOSIZE) {
xfree(lcmd);
}
if (lua_pcall(lstate, 0, 1, 0)) {
nlua_error(lstate, _("E5110: Error executing lua: %.*s"));
return;
}
for (linenr_T l = eap->line1; l <= eap->line2; l++) {
if (l > curbuf->b_ml.ml_line_count) {
break;
}
lua_pushvalue(lstate, -1);
lua_pushstring(lstate, (const char *)ml_get_buf(curbuf, l, false));
lua_pushnumber(lstate, (lua_Number)l);
if (lua_pcall(lstate, 2, 1, 0)) {
nlua_error(lstate, _("E5111: Error calling lua: %.*s"));
break;
}
if (lua_isstring(lstate, -1)) {
size_t new_line_len;
const char *const new_line = lua_tolstring(lstate, -1, &new_line_len);
char *const new_line_transformed = xmemdupz(new_line, new_line_len);
for (size_t i = 0; i < new_line_len; i++) {
if (new_line_transformed[i] == NUL) {
new_line_transformed[i] = '\n';
}
}
ml_replace(l, (char_u *)new_line_transformed, false);
changed_bytes(l, 0);
}
lua_pop(lstate, 1);
}
lua_pop(lstate, 1);
check_cursor();
update_screen(NOT_VALID);
}
/// Run lua file
///
/// Used for :luafile.
///
/// @param eap VimL command being run.
void ex_luafile(exarg_T *const eap)
FUNC_ATTR_NONNULL_ALL
{
lua_State *const lstate = nlua_enter();
if (luaL_loadfile(lstate, (const char *)eap->arg)) {
nlua_error(lstate, _("E5112: Error while creating lua chunk: %.*s"));
return;
}
if (lua_pcall(lstate, 0, 0, 0)) {
nlua_error(lstate, _("E5113: Error while calling lua chunk: %.*s"));
return;
}
}
static int create_tslua_parser(lua_State *L)
{
if (lua_gettop(L) < 1 || !lua_isstring(L, 1)) {
return luaL_error(L, "string expected");
}
const char *lang_name = lua_tostring(L, 1);
return tslua_push_parser(L, lang_name);
}
static void nlua_add_treesitter(lua_State *const lstate) FUNC_ATTR_NONNULL_ALL
{
tslua_init(lstate);
lua_pushcfunction(lstate, create_tslua_parser);
lua_setfield(lstate, -2, "_create_ts_parser");
lua_pushcfunction(lstate, tslua_register_lang);
lua_setfield(lstate, -2, "_ts_add_language");
lua_pushcfunction(lstate, tslua_inspect_lang);
lua_setfield(lstate, -2, "_ts_inspect_language");
lua_pushcfunction(lstate, ts_lua_parse_query);
lua_setfield(lstate, -2, "_ts_parse_query");
}
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