view src/vim9script.c @ 35308:22c03485f222 v9.1.0456

patch 9.1.0456: Left shift is incorrect with vartabstop and shiftwidth=0 Commit: https://github.com/vim/vim/commit/88d4f255b7b7a19bb4f6489e0ad0956e47d51fed Author: Gary Johnson <garyjohn@spocom.com> Date: Sat Jun 1 20:51:33 2024 +0200 patch 9.1.0456: Left shift is incorrect with vartabstop and shiftwidth=0 Problem: Left shift is incorrect with vartabstop and shiftwidth=0 Solution: make tabstop_at() function aware of shift direction (Gary Johnson) The problem was that with 'vartabstop' set and 'shiftwidth' equal 0, left shifts using << were shifting the line to the wrong column. The tabstop to the right of the first character in the line was being used as the shift amount instead of the tabstop to the left of that first character. The reason was that the tabstop_at() function always returned the value of the tabstop to the right of the given column and was not accounting for the direction of the shift. The solution was to make tabstop_at() aware of the direction of the shift and to choose the tabtop accordingly. A test was added to check this behavior and make sure it doesn't regress. While at it, also fix a few indentation/alignment issues. fixes: #14864 closes: #14887 Signed-off-by: Gary Johnson <garyjohn@spocom.com> Signed-off-by: Christian Brabandt <cb@256bit.org>
author Christian Brabandt <cb@256bit.org>
date Sat, 01 Jun 2024 21:00:03 +0200
parents 890b693189b0
children
line wrap: on
line source

/* vi:set ts=8 sts=4 sw=4 noet:
 *
 * VIM - Vi IMproved	by Bram Moolenaar
 *
 * Do ":help uganda"  in Vim to read copying and usage conditions.
 * Do ":help credits" in Vim to see a list of people who contributed.
 * See README.txt for an overview of the Vim source code.
 */

/*
 * vim9script.c: :vim9script, :import, :export and friends
 */

#include "vim.h"

// When not generating protos this is included in proto.h
#ifdef PROTO
# include "vim9.h"
#endif

/*
 * Return TRUE when currently using Vim9 script syntax.
 * Does not go up the stack, a ":function" inside vim9script uses legacy
 * syntax.
 */
    int
in_vim9script(void)
{
    // "sc_version" is also set when compiling a ":def" function in legacy
    // script.
    return (current_sctx.sc_version == SCRIPT_VERSION_VIM9
					 || (cmdmod.cmod_flags & CMOD_VIM9CMD))
		&& !(cmdmod.cmod_flags & CMOD_LEGACY);
}

#if defined(FEAT_EVAL) || defined(PROTO)
/*
 * Return TRUE when currently in a script with script version smaller than
 * "max_version" or command modifiers forced it.
 */
    int
in_old_script(int max_version)
{
    return (current_sctx.sc_version < max_version
					&& !(cmdmod.cmod_flags & CMOD_VIM9CMD))
		|| (cmdmod.cmod_flags & CMOD_LEGACY);
}

/*
 * Return TRUE if the current script is Vim9 script.
 * This also returns TRUE in a legacy function in a Vim9 script.
 */
    int
current_script_is_vim9(void)
{
    return SCRIPT_ID_VALID(current_sctx.sc_sid)
	    && SCRIPT_ITEM(current_sctx.sc_sid)->sn_version
						       == SCRIPT_VERSION_VIM9;
}
#endif

#ifdef FEAT_EVAL
/*
 * Clear Vim9 script-local variables and functions.
 */
    void
clear_vim9_scriptlocal_vars(int sid)
{
    hashtab_T	*ht = &SCRIPT_VARS(sid);

    hashtab_free_contents(ht);
    hash_init(ht);
    delete_script_functions(sid);

    // old imports and script variables are no longer valid
    free_imports_and_script_vars(sid);
}
#endif

/*
 * ":vim9script".
 */
    void
ex_vim9script(exarg_T *eap UNUSED)
{
#ifdef FEAT_EVAL
    int		    sid = current_sctx.sc_sid;
    scriptitem_T    *si;
    int		    found_noclear = FALSE;
    char_u	    *p;

    if (!sourcing_a_script(eap))
    {
	emsg(_(e_vim9script_can_only_be_used_in_script));
	return;
    }

    si = SCRIPT_ITEM(sid);
    if (si->sn_state == SN_STATE_HAD_COMMAND)
    {
	emsg(_(e_vim9script_must_be_first_command_in_script));
	return;
    }

    for (p = eap->arg; !IS_WHITE_OR_NUL(*p); p = skipwhite(skiptowhite(p)))
    {
	if (STRNCMP(p, "noclear", 7) == 0 && IS_WHITE_OR_NUL(p[7]))
	{
	    if (found_noclear)
	    {
		semsg(_(e_duplicate_argument_str), p);
		return;
	    }
	    found_noclear = TRUE;
	}
	else
	{
	    semsg(_(e_invalid_argument_str), eap->arg);
	    return;
	}
    }

    if (si->sn_state == SN_STATE_RELOAD && !found_noclear)
	// Reloading a script without the "noclear" argument: clear
	// script-local variables and functions.
	clear_vim9_scriptlocal_vars(sid);
    si->sn_state = SN_STATE_HAD_COMMAND;

    // Store the prefix with the script, it is used to find exported functions.
    if (si->sn_autoload_prefix == NULL)
	si->sn_autoload_prefix = get_autoload_prefix(si);

    current_sctx.sc_version = SCRIPT_VERSION_VIM9;
    si->sn_version = SCRIPT_VERSION_VIM9;

    if (STRCMP(p_cpo, CPO_VIM) != 0)
    {
	si->sn_save_cpo = vim_strsave(p_cpo);
	set_option_value_give_err((char_u *)"cpo",
					 0L, (char_u *)CPO_VIM, OPT_NO_REDRAW);
    }
#else
    // No check for this being the first command, the information is not
    // available.
    current_sctx.sc_version = SCRIPT_VERSION_VIM9;
#endif
}

#if defined(FEAT_EVAL) || defined(PROTO)
/*
 * When in Vim9 script give an error and return FAIL.
 */
    int
not_in_vim9(exarg_T *eap)
{
    if (in_vim9script())
	switch (eap->cmdidx)
	{
	    case CMD_k:
		if (eap->addr_count > 0)
		{
		    emsg(_(e_no_range_allowed));
		    return FAIL;
		}
		// FALLTHROUGH
	    case CMD_append:
	    case CMD_change:
	    case CMD_insert:
	    case CMD_open:
	    case CMD_t:
	    case CMD_xit:
		semsg(_(e_command_not_supported_in_vim9_script_missing_var_str), eap->cmd);
		return FAIL;
	    default: break;
	}
    return OK;
}

/*
 * Return TRUE if "p" points at "#{", not "#{{".
 * Give an error message if not done already.
 * This avoids that using a legacy style #{} dictionary leads to difficult to
 * understand errors.
 */
    int
vim9_bad_comment(char_u *p)
{
    if (p[0] == '#' && p[1] == '{' && p[2] != '{')
    {
	if (!did_emsg)
	    emsg(_(e_cannot_use_hash_curly_to_start_comment));
	return TRUE;
    }
    return FALSE;
}
#endif

/*
 * Return TRUE if "p" points at a "#" not followed by one '{'.
 * Gives an error for using "#{", not for "#{{".
 * Does not check for white space.
 */
    int
vim9_comment_start(char_u *p)
{
#ifdef FEAT_EVAL
    return p[0] == '#' && !vim9_bad_comment(p);
#else
    return p[0] == '#' && (p[1] != '{' || p[2] == '{');
#endif
}

#if defined(FEAT_EVAL) || defined(PROTO)

/*
 * "++nr" and "--nr" commands.
 */
    void
ex_incdec(exarg_T *eap)
{
    char_u	*cmd = eap->cmd;
    char_u	*nextcmd = eap->nextcmd;
    size_t	len = STRLEN(eap->cmd) + 8;

    if (VIM_ISWHITE(cmd[2]))
    {
	semsg(_(e_no_white_space_allowed_after_str_str),
			 eap->cmdidx == CMD_increment ? "++" : "--", eap->cmd);
	return;
    }

    // This works like "nr += 1" or "nr -= 1".
    // Add a '|' to avoid looking in the next line.
    eap->cmd = alloc(len);
    if (eap->cmd == NULL)
	return;
    vim_snprintf((char *)eap->cmd, len, "%s %c= 1 |", cmd + 2,
				     eap->cmdidx == CMD_increment ? '+' : '-');
    eap->arg = eap->cmd;
    eap->cmdidx = CMD_var;
    eap->nextcmd = NULL;
    ex_let(eap);
    vim_free(eap->cmd);
    eap->cmd = cmd;
    eap->nextcmd = nextcmd;
}

/*
 * ":export cmd"
 */
    void
ex_export(exarg_T *eap UNUSED)
{
    // can only get here when "export" wasn't caught in do_cmdline()
    emsg(_(e_export_can_only_be_used_in_vim9script));
}

/*
 * Add a new imported item entry to the current script.
 */
    static imported_T *
new_imported(garray_T *gap)
{
    if (ga_grow(gap, 1) == OK)
	return ((imported_T *)gap->ga_data + gap->ga_len++);
    return NULL;
}

/*
 * Free the script variables from "sn_all_vars".
 */
    static void
free_all_script_vars(scriptitem_T *si)
{
    int		todo;
    hashtab_T	*ht = &si->sn_all_vars.dv_hashtab;
    hashitem_T	*hi;
    sallvar_T	*sav;
    sallvar_T	*sav_next;
    int		idx;

    hash_lock(ht);
    todo = (int)ht->ht_used;
    FOR_ALL_HASHTAB_ITEMS(ht, hi, todo)
    {
	if (!HASHITEM_EMPTY(hi))
	{
	    --todo;

	    // Free the variable.  Don't remove it from the hashtab, ht_array
	    // might change then.  hash_clear() takes care of it later.
	    sav = HI2SAV(hi);
	    while (sav != NULL)
	    {
		sav_next = sav->sav_next;
		if (sav->sav_di == NULL)
		    clear_tv(&sav->sav_tv);
		vim_free(sav);
		sav = sav_next;
	    }
	}
    }
    hash_clear(ht);
    hash_init(ht);

    for (idx = 0; idx < si->sn_var_vals.ga_len; ++idx)
    {
	svar_T    *sv = ((svar_T *)si->sn_var_vals.ga_data) + idx;

	if (sv->sv_flags & SVFLAG_TYPE_ALLOCATED)
	    free_type(sv->sv_type);
    }
    ga_clear(&si->sn_var_vals);

    // existing commands using script variable indexes are no longer valid
    si->sn_script_seq = current_sctx.sc_seq;
}

/*
 * Free all imported items in script "sid".
 */
    void
free_imports_and_script_vars(int sid)
{
    scriptitem_T    *si = SCRIPT_ITEM(sid);
    int		    idx;

    for (idx = 0; idx < si->sn_imports.ga_len; ++idx)
    {
	imported_T *imp = ((imported_T *)si->sn_imports.ga_data) + idx;

	vim_free(imp->imp_name);
    }
    ga_clear(&si->sn_imports);

    free_all_script_vars(si);

    clear_type_list(&si->sn_type_list);
}

/*
 * Mark all imports as possible to redefine.  Used when a script is loaded
 * again but not cleared.
 */
    void
mark_imports_for_reload(int sid)
{
    scriptitem_T    *si = SCRIPT_ITEM(sid);
    int		    idx;

    for (idx = 0; idx < si->sn_imports.ga_len; ++idx)
    {
	imported_T *imp = ((imported_T *)si->sn_imports.ga_data) + idx;

	imp->imp_flags |= IMP_FLAGS_RELOAD;
    }
}

/*
 * Part of "import" that handles a relative or absolute file name/
 * Returns OK or FAIL.
 */
    static int
handle_import_fname(char_u *fname, int is_autoload, int *sid)
{
    if (is_autoload)
    {
	scriptitem_T	*si;

	*sid = find_script_by_name(fname);
	if (*sid < 0)
	{
	    int error = OK;

	    // Script does not exist yet, check name and create a new
	    // scriptitem.
	    if (!file_is_readable(fname))
	    {
		semsg(_(mch_isdir(fname) ? e_str_is_directory
					  : e_cannot_read_from_str_2), fname);
		return FAIL;
	    }
	    *sid = get_new_scriptitem_for_fname(&error, fname);
	    if (error == FAIL)
		return FAIL;
	}

	si = SCRIPT_ITEM(*sid);
	si->sn_import_autoload = TRUE;

	if (si->sn_autoload_prefix == NULL)
	    si->sn_autoload_prefix = get_autoload_prefix(si);

	// with testing override: load autoload script right away
	if (!override_autoload || si->sn_state != SN_STATE_NOT_LOADED)
	    return OK;
    }
    return do_source(fname, FALSE, DOSO_NONE, sid);
}

/*
 * Handle an ":import" command and add the resulting imported_T to "gap", when
 * not NULL, or script "import_sid" sn_imports.
 * "cctx" is NULL at the script level.
 * Returns a pointer to after the command or NULL in case of failure
 */
    static char_u *
handle_import(
	char_u	    *arg_start,
	garray_T    *gap,
	int	    import_sid,
	evalarg_T   *evalarg,
	void	    *cctx)
{
    char_u	*arg = arg_start;
    char_u	*nextarg;
    int		is_autoload = FALSE;
    int		getnext;
    char_u	*expr_end;
    int		ret = FAIL;
    char_u	*as_name = NULL;
    typval_T	tv;
    int		sid = -2;
    int		res;
    long	start_lnum = SOURCING_LNUM;
    garray_T	*import_gap;
    int		i;

    if (STRNCMP(arg, "autoload", 8) == 0 && VIM_ISWHITE(arg[8]))
    {
	is_autoload = TRUE;
	arg = skipwhite(arg + 8);
    }

    // The name of the file can be an expression, which must evaluate to a
    // string.
    ret = eval0_retarg(arg, &tv, NULL, evalarg, &expr_end);
    if (ret == FAIL)
	goto erret;
    if (tv.v_type != VAR_STRING
		       || tv.vval.v_string == NULL || *tv.vval.v_string == NUL)
    {
	semsg(_(e_invalid_string_for_import_str), arg);
	goto erret;
    }

    // Give error messages for the start of the line.
    SOURCING_LNUM = start_lnum;

    /*
     * find script file
     */
    if (*tv.vval.v_string == '.')
    {
	size_t		len;
	scriptitem_T	*si = SCRIPT_ITEM(current_sctx.sc_sid);
	char_u		*tail = gettail(si->sn_name);
	char_u		*from_name;
	int		sourced_from_nofile_buf = FALSE;

	if (STRNCMP(si->sn_name, ":source buffer=", 15) == 0)
	    sourced_from_nofile_buf = TRUE;

	if (!sourced_from_nofile_buf)
	{
	    // Relative to current script: "./name.vim", "../../name.vim".
	    len = STRLEN(si->sn_name) - STRLEN(tail) + STRLEN(tv.vval.v_string) + 2;
	    from_name = alloc((int)len);
	    if (from_name == NULL)
		goto erret;
	    vim_strncpy(from_name, si->sn_name, tail - si->sn_name);
	    add_pathsep(from_name);
	    STRCAT(from_name, tv.vval.v_string);
	}
	else
	    from_name = vim_strsave(tv.vval.v_string);
	simplify_filename(from_name);

	res = handle_import_fname(from_name, is_autoload, &sid);
	vim_free(from_name);
    }
    else if (mch_isFullName(tv.vval.v_string)
#ifdef BACKSLASH_IN_FILENAME
	    // On MS-Windows omitting the drive is still handled like an
	    // absolute path, not using 'runtimepath'.
	    || *tv.vval.v_string == '/' || *tv.vval.v_string == '\\'
#endif
	    )
    {
	// Absolute path: "/tmp/name.vim"
	res = handle_import_fname(tv.vval.v_string, is_autoload, &sid);
    }
    else if (is_autoload)
    {
	size_t	    len = 9 + STRLEN(tv.vval.v_string) + 1;
	char_u	    *from_name;

	// Find file in "autoload" subdirs in 'runtimepath'.
	from_name = alloc((int)len);
	if (from_name == NULL)
	    goto erret;
	vim_snprintf((char *)from_name, len, "autoload/%s", tv.vval.v_string);
	// we need a scriptitem without loading the script
	sid = find_script_in_rtp(from_name);
	vim_free(from_name);
	if (SCRIPT_ID_VALID(sid))
	{
	    scriptitem_T    *si = SCRIPT_ITEM(sid);

	    if (si->sn_autoload_prefix == NULL)
		si->sn_autoload_prefix = get_autoload_prefix(si);
	    res = OK;
	    if (override_autoload && si->sn_state == SN_STATE_NOT_LOADED)
		// testing override: load autoload script right away
		(void)do_source(si->sn_name, FALSE, DOSO_NONE, NULL);
	}
	else
	    res = FAIL;
    }
    else
    {
	size_t	    len = 7 + STRLEN(tv.vval.v_string) + 1;
	char_u	    *from_name;

	// Find file in "import" subdirs in 'runtimepath'.
	from_name = alloc((int)len);
	if (from_name == NULL)
	    goto erret;
	vim_snprintf((char *)from_name, len, "import/%s", tv.vval.v_string);
	res = source_in_path(p_rtp, from_name, DIP_NOAFTER, &sid);
	vim_free(from_name);
    }

    if (res == FAIL || sid <= 0)
    {
	semsg(_(is_autoload && sid == -2
		    ? e_autoload_import_cannot_use_absolute_or_relative_path
		    : e_could_not_import_str), tv.vval.v_string);
	goto erret;
    }

    if (sid == current_sctx.sc_sid)
    {
	emsg(_(e_script_cannot_import_itself));
	goto erret;
    }

    import_gap = gap != NULL ? gap : &SCRIPT_ITEM(import_sid)->sn_imports;
    for (i = 0; i < import_gap->ga_len; ++i)
    {
	imported_T *import = (imported_T *)import_gap->ga_data + i;

	if (import->imp_sid == sid)
	{
	    if (import->imp_flags & IMP_FLAGS_RELOAD)
	    {
		// encountering same script first time on a reload is OK
		import->imp_flags &= ~IMP_FLAGS_RELOAD;
		break;
	    }
	    semsg(_(e_cannot_import_same_script_twice_str), tv.vval.v_string);
	    goto erret;
	}
    }

    // Allow for the "as Name" to be in the next line.
    nextarg = eval_next_non_blank(expr_end, evalarg, &getnext);
    if (STRNCMP("as", nextarg, 2) == 0 && IS_WHITE_OR_NUL(nextarg[2]))
    {
	char_u *p;

	if (getnext)
	    arg = eval_next_line(expr_end, evalarg);
	else
	    arg = nextarg;

	// Skip over "as Name "; no line break allowed after "as".
	// Do not allow for ':' and '#'.
	arg = skipwhite(arg + 2);
	p = arg;
	if (eval_isnamec1(*arg))
	    while (ASCII_ISALNUM(*arg) || *arg == '_')
		++arg;
	if (p == arg || !IS_WHITE_OR_NUL(*arg))
	{
	    semsg(_(e_syntax_error_in_import_str), p);
	    goto erret;
	}
	as_name = vim_strnsave(p, arg - p);
	arg = skipwhite(arg);
    }
    else
    {
	char_u *p = gettail(tv.vval.v_string);
	char_u *end = (char_u *)strstr((char *)p, ".vim");

	if (!ends_excmd2(arg_start, expr_end))
	{
	    semsg(_(e_trailing_characters_str), expr_end);
	    goto erret;
	}
	if (end == NULL || end[4] != NUL)
	{
	    semsg(_(e_imported_script_must_use_as_or_end_in_dot_vim_str), p);
	    goto erret;
	}
	if (end == p)
	{
	    semsg(_(e_cannot_import_dot_vim_without_using_as), p);
	    goto erret;
	}
	as_name = vim_strnsave(p, end - p);
    }

    if (as_name != NULL)
    {
	imported_T  *imported;

	imported = find_imported(as_name, STRLEN(as_name), FALSE);
	if (imported != NULL && imported->imp_sid != sid)
	{
	    semsg(_(e_name_already_defined_str), as_name);
	    goto erret;
	}
	else if (imported == NULL
		&& check_defined(as_name, STRLEN(as_name), cctx, NULL,
								FALSE) == FAIL)
	    goto erret;

	if (imported == NULL)
	{
	    imported = new_imported(import_gap);
	    if (imported == NULL)
		goto erret;
	    imported->imp_name = as_name;
	    as_name = NULL;
	    imported->imp_sid = sid;
	    if (is_autoload)
		imported->imp_flags = IMP_FLAGS_AUTOLOAD;
	}
    }

erret:
    clear_tv(&tv);
    vim_free(as_name);
    return arg;
}

/*
 * ":import 'filename'"
 * ":import 'filename' as Name"
 */
    void
ex_import(exarg_T *eap)
{
    char_u	*cmd_end;
    evalarg_T	evalarg;

    if (!sourcing_a_script(eap))
    {
	emsg(_(e_import_can_only_be_used_in_script));
	return;
    }
    fill_evalarg_from_eap(&evalarg, eap, eap->skip);

    cmd_end = handle_import(eap->arg, NULL, current_sctx.sc_sid,
							       &evalarg, NULL);
    if (cmd_end != NULL)
	set_nextcmd(eap, cmd_end);
    clear_evalarg(&evalarg, eap);
}

/*
 * When a script is a symlink it may be imported with one name and sourced
 * under another name.  Adjust the import script ID if needed.
 * "*sid" must be a valid script ID.
 */
    void
import_check_sourced_sid(int *sid)
{
    scriptitem_T *script = SCRIPT_ITEM(*sid);

    if (script->sn_sourced_sid > 0)
	*sid = script->sn_sourced_sid;
}

/*
 * Find an exported item in "sid" matching "name".
 * Either "cctx" or "cstack" is NULL.
 * When it is a variable return the index.
 * When it is a user function return "*ufunc".
 * When not found returns -1 and "*ufunc" is NULL.
 */
    int
find_exported(
	int	    sid,
	char_u	    *name,
	ufunc_T	    **ufunc,
	type_T	    **type,
	cctx_T	    *cctx,
	cstack_T    *cstack,
	int	    verbose)
{
    int		idx = -1;
    svar_T	*sv;
    scriptitem_T *script = SCRIPT_ITEM(sid);

    *ufunc = NULL;

    if (script->sn_import_autoload && script->sn_state == SN_STATE_NOT_LOADED)
    {
	if (do_source(script->sn_name, FALSE, DOSO_NONE, NULL) == FAIL)
	{
	    semsg(_(e_cant_open_file_str), script->sn_name);
	    return -1;
	}
    }

    // Find name in "script".
    idx = get_script_item_idx(sid, name, 0, cctx, cstack);
    if (idx >= 0)
    {
	sv = ((svar_T *)script->sn_var_vals.ga_data) + idx;
	if ((sv->sv_flags & SVFLAG_EXPORTED) == 0)
	{
	    if (verbose)
		semsg(_(e_item_not_exported_in_script_str), name);
	    return -1;
	}
	*type = sv->sv_type;
    }
    else
    {
	size_t	len = STRLEN(name);
	char_u	buffer[200];
	char_u	*funcname;

	// It could be a user function.  Normally this is stored as
	// "<SNR>99_name".  For an autoload script a function is stored with
	// the autoload prefix: "dir#script#name".
	if (script->sn_autoload_prefix != NULL)
	    len += STRLEN(script->sn_autoload_prefix) + 2;
	else
	    len += 15;

	if (len < sizeof(buffer))
	    funcname = buffer;
	else
	{
	    funcname = alloc(len);
	    if (funcname == NULL)
		return -1;
	}
	if (script->sn_autoload_prefix != NULL)
	{
	    sprintf((char *)funcname, "%s%s", script->sn_autoload_prefix, name);
	}
	else
	{
	    funcname[0] = K_SPECIAL;
	    funcname[1] = KS_EXTRA;
	    funcname[2] = (int)KE_SNR;
	    sprintf((char *)funcname + 3, "%ld_%s", (long)sid, name);
	}
	*ufunc = find_func(funcname, FALSE);

	if (*ufunc == NULL)
	{
	    if (verbose)
	    {
		ufunc_T *alt_ufunc = NULL;

		if (script->sn_autoload_prefix != NULL)
		{
		    // try find the function by the script-local name
		    funcname[0] = K_SPECIAL;
		    funcname[1] = KS_EXTRA;
		    funcname[2] = (int)KE_SNR;
		    sprintf((char *)funcname + 3, "%ld_%s", (long)sid, name);
		    alt_ufunc = find_func(funcname, FALSE);
		}
		if (alt_ufunc != NULL)
		    semsg(_(e_item_not_exported_in_script_str), name);
		else
		    semsg(_(e_item_not_found_in_script_str), name);
	    }
	}
	else if (((*ufunc)->uf_flags & FC_EXPORT) == 0)
	{
	    if (verbose)
		semsg(_(e_item_not_exported_in_script_str), name);
	    *ufunc = NULL;
	}
	if (funcname != buffer)
	    vim_free(funcname);
    }

    return idx;
}

/*
 * Declare a script-local variable without init: "var name: type".
 * "const" is an error since the value is missing.
 * Returns a pointer to after the type.
 */
    char_u *
vim9_declare_scriptvar(exarg_T *eap, char_u *arg)
{
    char_u	    *p;
    char_u	    *name;
    scriptitem_T    *si = SCRIPT_ITEM(current_sctx.sc_sid);
    type_T	    *type;
    typval_T	    init_tv;

    if (eap->cmdidx == CMD_final || eap->cmdidx == CMD_const)
    {
	if (eap->cmdidx == CMD_final)
	    emsg(_(e_final_requires_a_value));
	else
	    emsg(_(e_const_requires_a_value));
	return arg + STRLEN(arg);
    }

    // Check for valid starting character.
    if (!eval_isnamec1(*arg))
    {
	semsg(_(e_invalid_argument_str), arg);
	return arg + STRLEN(arg);
    }

    for (p = arg + 1; *p != NUL && eval_isnamec(*p); MB_PTR_ADV(p))
	if (*p == ':' && (VIM_ISWHITE(p[1]) || p != arg + 1))
	    break;

    if (*p != ':')
    {
	emsg(_(e_type_or_initialization_required));
	return arg + STRLEN(arg);
    }
    if (!VIM_ISWHITE(p[1]))
    {
	semsg(_(e_white_space_required_after_str_str), ":", p);
	return arg + STRLEN(arg);
    }
    name = vim_strnsave(arg, p - arg);

    // parse type, check for reserved name
    p = skipwhite(p + 1);
    type = parse_type(&p, &si->sn_type_list, TRUE);
    if (type == NULL || check_reserved_name(name, FALSE) == FAIL)
    {
	vim_free(name);
	return p;
    }

    // Create the variable with 0/NULL value.
    CLEAR_FIELD(init_tv);
    if (type->tt_type == VAR_ANY)
	// A variable of type "any" is not possible, just use zero instead
	init_tv.v_type = VAR_NUMBER;
    else
	init_tv.v_type = type->tt_type;
    set_var_const(name, 0, type, &init_tv, FALSE, ASSIGN_INIT, 0);

    vim_free(name);
    return p;
}

/*
 * Vim9 part of adding a script variable: add it to sn_all_vars (lookup by name
 * with a hashtable) and sn_var_vals (lookup by index).
 * When "create" is TRUE this is a new variable, otherwise find and update an
 * existing variable.
 * "flags" can have ASSIGN_FINAL, ASSIGN_CONST or ASSIGN_INIT.
 * When "*type" is NULL use "tv" for the type and update "*type".  If
 * "do_member" is TRUE also use the member type, otherwise use "any".
 */
    void
update_vim9_script_var(
	int	    create,
	dictitem_T  *di,
	char_u	    *name,
	int	    flags,
	typval_T    *tv,
	type_T	    **type,
	int	    do_member)
{
    scriptitem_T    *si = SCRIPT_ITEM(current_sctx.sc_sid);
    hashitem_T	    *hi;
    svar_T	    *sv = NULL;

    if (create)
    {
	sallvar_T   *newsav;
	sallvar_T   *sav = NULL;

	// Store a pointer to the typval_T, so that it can be found by index
	// instead of using a hastab lookup.
	if (ga_grow(&si->sn_var_vals, 1) == FAIL)
	    return;

	hi = hash_find(&si->sn_all_vars.dv_hashtab, name);
	if (!HASHITEM_EMPTY(hi))
	{
	    // Variable with this name exists, either in this block or in
	    // another block.
	    for (sav = HI2SAV(hi); ; sav = sav->sav_next)
	    {
		if (sav->sav_block_id == si->sn_current_block_id)
		{
		    // variable defined in a loop, re-use the entry
		    sv = ((svar_T *)si->sn_var_vals.ga_data)
						       + sav->sav_var_vals_idx;
		    // unhide the variable
		    if (sv->sv_tv == &sav->sav_tv)
		    {
			clear_tv(&sav->sav_tv);
			sv->sv_tv = &di->di_tv;
			sav->sav_di = di;
		    }
		    break;
		}
		if (sav->sav_next == NULL)
		    break;
	    }
	}

	if (sv == NULL)
	{
	    // Variable not defined or not defined in current block: Add a
	    // svar_T and create a new sallvar_T.
	    sv = ((svar_T *)si->sn_var_vals.ga_data) + si->sn_var_vals.ga_len;
	    newsav = (sallvar_T *)alloc_clear(
			      offsetof(sallvar_T, sav_key) + STRLEN(name) + 1);
	    if (newsav == NULL)
		return;

	    sv->sv_tv = &di->di_tv;
	    sv->sv_const = (flags & ASSIGN_FINAL) ? ASSIGN_FINAL
				   : (flags & ASSIGN_CONST) ? ASSIGN_CONST : 0;
	    sv->sv_flags = is_export ? SVFLAG_EXPORTED : 0;
	    if ((flags & ASSIGN_INIT) == 0)
		sv->sv_flags |= SVFLAG_ASSIGNED;
	    newsav->sav_var_vals_idx = si->sn_var_vals.ga_len;
	    ++si->sn_var_vals.ga_len;
	    // a pointer to the first char avoids a FORTIFY_SOURCE problem
	    STRCPY(&newsav->sav_key[0], name);
	    sv->sv_name = newsav->sav_key;
	    newsav->sav_di = di;
	    newsav->sav_block_id = si->sn_current_block_id;

	    if (HASHITEM_EMPTY(hi))
		// new variable name
		hash_add(&si->sn_all_vars.dv_hashtab, newsav->sav_key,
							       "add variable");
	    else if (sav != NULL)
		// existing name in a new block, append to the list
		sav->sav_next = newsav;
	}
    }
    else
    {
	sv = find_typval_in_script(&di->di_tv, 0, TRUE);
    }
    if (sv != NULL)
    {
	if (*type == NULL)
	    *type = typval2type(tv, get_copyID(), &si->sn_type_list,
					       do_member ? TVTT_DO_MEMBER : 0);
	else if ((flags & ASSIGN_INIT) == 0
		&& (*type)->tt_type == VAR_BLOB && tv->v_type == VAR_BLOB
						    && tv->vval.v_blob == NULL)
	{
	    // "var b: blob = null_blob" has a different type.
	    *type = &t_blob_null;
	}
	if (sv->sv_flags & SVFLAG_TYPE_ALLOCATED)
	    free_type(sv->sv_type);
	if (*type != NULL && ((*type)->tt_type == VAR_FUNC
					   || (*type)->tt_type == VAR_PARTIAL))
	{
	    // The type probably uses uf_type_list, which is cleared when the
	    // function is freed, but the script variable may keep the type.
	    // Make a copy to avoid using freed memory.
	    sv->sv_type = alloc_type(*type);
	    sv->sv_flags |= SVFLAG_TYPE_ALLOCATED;
	}
	else
	{
	    sv->sv_type = *type;
	    sv->sv_flags &= ~SVFLAG_TYPE_ALLOCATED;
	}
    }

    // let ex_export() know the export worked.
    is_export = FALSE;
}

/*
 * Hide a script variable when leaving a block.
 * "idx" is de index in sn_var_vals.
 * When "func_defined" is non-zero then a function was defined in this block,
 * the variable may be accessed by it.  Otherwise the variable can be cleared.
 */
    void
hide_script_var(scriptitem_T *si, int idx, int func_defined)
{
    svar_T	*sv = ((svar_T *)si->sn_var_vals.ga_data) + idx;
    hashtab_T	*script_ht = get_script_local_ht();
    hashtab_T	*all_ht = &si->sn_all_vars.dv_hashtab;
    hashitem_T	*script_hi;
    hashitem_T	*all_hi;

    // Remove a variable declared inside the block, if it still exists.
    // If it was added in a nested block it will already have been removed.
    // The typval is moved into the sallvar_T.
    script_hi = hash_find(script_ht, sv->sv_name);
    all_hi = hash_find(all_ht, sv->sv_name);

    if (HASHITEM_EMPTY(script_hi) || HASHITEM_EMPTY(all_hi))
	return;

    dictitem_T	*di = HI2DI(script_hi);
    sallvar_T	*sav = HI2SAV(all_hi);
    sallvar_T	*sav_prev = NULL;

    // There can be multiple entries with the same name in different
    // blocks, find the right one.
    while (sav != NULL && sav->sav_var_vals_idx != idx)
    {
	sav_prev = sav;
	sav = sav->sav_next;
    }
    if (sav == NULL)
	return;

    if (func_defined)
    {
	// move the typval from the dictitem to the sallvar
	sav->sav_tv = di->di_tv;
	di->di_tv.v_type = VAR_UNKNOWN;
	sav->sav_flags = di->di_flags;
	sav->sav_di = NULL;
	sv->sv_tv = &sav->sav_tv;
    }
    else
    {
	if (sav_prev == NULL)
	    hash_remove(all_ht, all_hi, "hide variable");
	else
	    sav_prev->sav_next = sav->sav_next;
	sv->sv_name = NULL;
	vim_free(sav);
    }
    delete_var(script_ht, script_hi);
}

/*
 * Find the script-local variable that links to "dest".
 * If "sid" is zero use the current script.
 * if "must_find" is TRUE and "dest" cannot be found report an internal error.
 * Returns NULL if not found and give an internal error.
 */
    svar_T *
find_typval_in_script(typval_T *dest, scid_T sid, int must_find)
{
    scriptitem_T    *si = SCRIPT_ITEM(sid == 0 ? current_sctx.sc_sid : sid);
    int		    idx;

    if (si->sn_version != SCRIPT_VERSION_VIM9)
	// legacy script doesn't store variable types
	return NULL;

    // Find the svar_T in sn_var_vals.  Start at the end, in a for loop the
    // variable was added at the end.
    for (idx = si->sn_var_vals.ga_len - 1; idx >= 0; --idx)
    {
	svar_T    *sv = ((svar_T *)si->sn_var_vals.ga_data) + idx;

	// If "sv_name" is NULL the variable was hidden when leaving a block,
	// don't check "sv_tv" then, it might be used for another variable now.
	if (sv->sv_name != NULL && sv->sv_tv == dest)
	    return sv;
    }
    if (must_find)
	iemsg("find_typval_in_script(): not found");
    return NULL;
}

/*
 * Check if the type of script variable "dest" allows assigning "value".
 * If needed convert "value" to a bool.
 */
    int
check_script_var_type(
	svar_T	    *sv,
	typval_T    *value,
	char_u	    *name,
	where_T	    where)
{
    int	    ret;

    if (sv->sv_const != 0)
    {
	semsg(_(e_cannot_change_readonly_variable_str), name);
	return FAIL;
    }
    ret = check_typval_type(sv->sv_type, value, where);
    if (ret == OK && need_convert_to_bool(sv->sv_type, value))
    {
	int	val = tv2bool(value);

	clear_tv(value);
	value->v_type = VAR_BOOL;
	value->v_lock = 0;
	value->vval.v_number = val ? VVAL_TRUE : VVAL_FALSE;
    }
    return ret;
}

// words that cannot be used as a variable
static char *reserved[] = {
    "true",
    "false",
    "null",
    "null_blob",
    "null_dict",
    "null_function",
    "null_list",
    "null_partial",
    "null_string",
    "null_channel",
    "null_job",
    "super",
    "this",
    NULL
};

    int
check_reserved_name(char_u *name, int is_objm_access)
{
    int idx;

    for (idx = 0; reserved[idx] != NULL; ++idx)
	if (STRCMP(reserved[idx], name) == 0
		&& !(STRCMP("this", name) == 0 && is_objm_access))
	{
	    semsg(_(e_cannot_use_reserved_name_str), name);
	    return FAIL;
	}
    return OK;
}

#endif // FEAT_EVAL