mpv/input/cmd.c

660 lines
20 KiB
C

/*
* This file is part of mpv.
*
* mpv is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* mpv is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with mpv. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stddef.h>
#include "misc/bstr.h"
#include "misc/node.h"
#include "common/common.h"
#include "common/msg.h"
#include "options/m_option.h"
#include "cmd.h"
#include "input.h"
#include "misc/json.h"
#include "libmpv/client.h"
static void destroy_cmd(void *ptr)
{
struct mp_cmd *cmd = ptr;
for (int n = 0; n < cmd->nargs; n++) {
if (cmd->args[n].type)
m_option_free(cmd->args[n].type, &cmd->args[n].v);
}
}
struct flag {
const char *name;
unsigned int remove, add;
};
static const struct flag cmd_flags[] = {
{"no-osd", MP_ON_OSD_FLAGS, MP_ON_OSD_NO},
{"osd-bar", MP_ON_OSD_FLAGS, MP_ON_OSD_BAR},
{"osd-msg", MP_ON_OSD_FLAGS, MP_ON_OSD_MSG},
{"osd-msg-bar", MP_ON_OSD_FLAGS, MP_ON_OSD_MSG | MP_ON_OSD_BAR},
{"osd-auto", MP_ON_OSD_FLAGS, MP_ON_OSD_AUTO},
{"expand-properties", 0, MP_EXPAND_PROPERTIES},
{"raw", MP_EXPAND_PROPERTIES, 0},
{"repeatable", 0, MP_ALLOW_REPEAT},
{"async", MP_SYNC_CMD, MP_ASYNC_CMD},
{"sync", MP_ASYNC_CMD, MP_SYNC_CMD},
{0}
};
static bool apply_flag(struct mp_cmd *cmd, bstr str)
{
for (int n = 0; cmd_flags[n].name; n++) {
if (bstr_equals0(str, cmd_flags[n].name)) {
cmd->flags = (cmd->flags & ~cmd_flags[n].remove) | cmd_flags[n].add;
return true;
}
}
return false;
}
static bool find_cmd(struct mp_log *log, struct mp_cmd *cmd, bstr name)
{
if (name.len == 0) {
mp_err(log, "Command name missing.\n");
return false;
}
char nname[80];
snprintf(nname, sizeof(nname), "%.*s", BSTR_P(name));
for (int n = 0; nname[n]; n++) {
if (nname[n] == '_')
nname[n] = '-';
}
for (int n = 0; mp_cmds[n].name; n++) {
if (strcmp(nname, mp_cmds[n].name) == 0) {
cmd->def = &mp_cmds[n];
cmd->name = (char *)cmd->def->name;
return true;
}
}
mp_err(log, "Command '%.*s' not found.\n", BSTR_P(name));
return false;
}
static bool is_vararg(const struct mp_cmd_def *m, int i)
{
return m->vararg && (i + 1 >= MP_CMD_DEF_MAX_ARGS || !m->args[i + 1].type);
}
static const struct m_option *get_arg_type(const struct mp_cmd_def *cmd, int i)
{
const struct m_option *opt = NULL;
if (is_vararg(cmd, i)) {
// The last arg in a vararg command sets all vararg types.
for (int n = MPMIN(i, MP_CMD_DEF_MAX_ARGS - 1); n >= 0; n--) {
if (cmd->args[n].type) {
opt = &cmd->args[n];
break;
}
}
} else if (i < MP_CMD_DEF_MAX_ARGS) {
opt = &cmd->args[i];
}
return opt && opt->type ? opt : NULL;
}
// Return the name of the argument, possibly as stack allocated string (which is
// why this is a macro, and out of laziness). Otherwise as get_arg_type().
#define get_arg_name(cmd, i) \
((i) < MP_CMD_DEF_MAX_ARGS && (cmd)->args[(i)].name && \
(cmd)->args[(i)].name[0] \
? (cmd)->args[(i)].name : mp_tprintf(10, "%d", (i) + 1))
// Verify that there are no missing args, fill in missing optional args.
static bool finish_cmd(struct mp_log *log, struct mp_cmd *cmd)
{
for (int i = 0; i < MP_CMD_DEF_MAX_ARGS; i++) {
// (type==NULL is used for yet unset arguments)
if (i < cmd->nargs && cmd->args[i].type)
continue;
const struct m_option *opt = get_arg_type(cmd->def, i);
if (i >= cmd->nargs && (!opt || is_vararg(cmd->def, i)))
break;
if (!opt->defval && !(opt->flags & MP_CMD_OPT_ARG)) {
mp_err(log, "Command %s: required argument %s not set.\n",
cmd->name, get_arg_name(cmd->def, i));
return false;
}
struct mp_cmd_arg arg = {.type = opt};
if (opt->defval)
m_option_copy(opt, &arg.v, opt->defval);
assert(i <= cmd->nargs);
if (i == cmd->nargs) {
MP_TARRAY_APPEND(cmd, cmd->args, cmd->nargs, arg);
} else {
cmd->args[i] = arg;
}
}
if (!(cmd->flags & (MP_ASYNC_CMD | MP_SYNC_CMD)))
cmd->flags |= cmd->def->default_async ? MP_ASYNC_CMD : MP_SYNC_CMD;
return true;
}
static bool set_node_arg(struct mp_log *log, struct mp_cmd *cmd, int i,
mpv_node *val)
{
const char *name = get_arg_name(cmd->def, i);
const struct m_option *opt = get_arg_type(cmd->def, i);
if (!opt) {
mp_err(log, "Command %s: has only %d arguments.\n", cmd->name, i);
return false;
}
if (i < cmd->nargs && cmd->args[i].type) {
mp_err(log, "Command %s: argument %s was already set.\n", cmd->name, name);
return false;
}
struct mp_cmd_arg arg = {.type = opt};
void *dst = &arg.v;
if (val->format == MPV_FORMAT_STRING) {
int r = m_option_parse(log, opt, bstr0(cmd->name),
bstr0(val->u.string), dst);
if (r < 0) {
mp_err(log, "Command %s: argument %s can't be parsed: %s.\n",
cmd->name, name, m_option_strerror(r));
return false;
}
} else {
int r = m_option_set_node(opt, dst, val);
if (r < 0) {
mp_err(log, "Command %s: argument %s has incompatible type.\n",
cmd->name, name);
return false;
}
}
// (leave unset arguments blank, to be set later or checked by finish_cmd())
while (i >= cmd->nargs) {
struct mp_cmd_arg t = {0};
MP_TARRAY_APPEND(cmd, cmd->args, cmd->nargs, t);
}
cmd->args[i] = arg;
return true;
}
static bool cmd_node_array(struct mp_log *log, struct mp_cmd *cmd, mpv_node *node)
{
assert(node->format == MPV_FORMAT_NODE_ARRAY);
mpv_node_list *args = node->u.list;
int cur = 0;
while (cur < args->num) {
if (args->values[cur].format != MPV_FORMAT_STRING)
break;
if (!apply_flag(cmd, bstr0(args->values[cur].u.string)))
break;
cur++;
}
bstr cmd_name = {0};
if (cur < args->num && args->values[cur].format == MPV_FORMAT_STRING)
cmd_name = bstr0(args->values[cur++].u.string);
if (!find_cmd(log, cmd, cmd_name))
return false;
int first = cur;
for (int i = 0; i < args->num - first; i++) {
if (!set_node_arg(log, cmd, cmd->nargs, &args->values[cur++]))
return false;
}
return true;
}
static bool cmd_node_map(struct mp_log *log, struct mp_cmd *cmd, mpv_node *node)
{
assert(node->format == MPV_FORMAT_NODE_MAP);
mpv_node_list *args = node->u.list;
mpv_node *name = node_map_get(node, "name");
if (!name || name->format != MPV_FORMAT_STRING)
return false;
if (!find_cmd(log, cmd, bstr0(name->u.string)))
return false;
if (cmd->def->vararg) {
mp_err(log, "Command %s: this command uses a variable number of "
"arguments, which does not work with named arguments.\n",
cmd->name);
return false;
}
for (int n = 0; n < args->num; n++) {
const char *key = args->keys[n];
mpv_node *val = &args->values[n];
if (strcmp(key, "name") == 0) {
// already handled above
} else if (strcmp(key, "_flags") == 0) {
if (val->format != MPV_FORMAT_NODE_ARRAY)
return false;
mpv_node_list *flags = val->u.list;
for (int i = 0; i < flags->num; i++) {
if (flags->values[i].format != MPV_FORMAT_STRING)
return false;
if (!apply_flag(cmd, bstr0(flags->values[i].u.string)))
return false;
}
} else {
int arg = -1;
for (int i = 0; i < MP_CMD_DEF_MAX_ARGS; i++) {
const char *arg_name = cmd->def->args[i].name;
if (arg_name && arg_name[0] && strcmp(key, arg_name) == 0) {
arg = i;
break;
}
}
if (arg < 0) {
mp_err(log, "Command %s: no argument %s.\n", cmd->name, key);
return false;
}
if (!set_node_arg(log, cmd, arg, val))
return false;
}
}
return true;
}
struct mp_cmd *mp_input_parse_cmd_node(struct mp_log *log, mpv_node *node)
{
struct mp_cmd *cmd = talloc_ptrtype(NULL, cmd);
talloc_set_destructor(cmd, destroy_cmd);
*cmd = (struct mp_cmd) { .scale = 1, .scale_units = 1 };
bool res = false;
if (node->format == MPV_FORMAT_NODE_ARRAY) {
res = cmd_node_array(log, cmd, node);
} else if (node->format == MPV_FORMAT_NODE_MAP) {
res = cmd_node_map(log, cmd, node);
}
res = res && finish_cmd(log, cmd);
if (!res)
TA_FREEP(&cmd);
return cmd;
}
static bool read_token(bstr str, bstr *out_rest, bstr *out_token)
{
bstr t = bstr_lstrip(str);
int next = bstrcspn(t, WHITESPACE "#;");
if (!next)
return false;
*out_token = bstr_splice(t, 0, next);
*out_rest = bstr_cut(t, next);
return true;
}
struct parse_ctx {
struct mp_log *log;
void *tmp;
bstr start, str;
};
static int pctx_read_token(struct parse_ctx *ctx, bstr *out)
{
*out = (bstr){0};
ctx->str = bstr_lstrip(ctx->str);
bstr start = ctx->str;
if (bstr_eatstart0(&ctx->str, "\"")) {
if (!mp_append_escaped_string_noalloc(ctx->tmp, out, &ctx->str)) {
MP_ERR(ctx, "Broken string escapes: ...>%.*s<.\n", BSTR_P(start));
return -1;
}
if (!bstr_eatstart0(&ctx->str, "\"")) {
MP_ERR(ctx, "Unterminated quotes: ...>%.*s<.\n", BSTR_P(start));
return -1;
}
return 1;
}
if (ctx->start.len > 1 && bstr_eatstart0(&ctx->str, "!")) {
char endquote[2] = {ctx->str.start[0], '!'};
ctx->str = bstr_cut(ctx->str, 1);
int next = bstr_find(ctx->str, (bstr){endquote, 2});
if (next < 0) {
MP_ERR(ctx, "Unterminated custom quote: ...>%.*s<.\n", BSTR_P(start));
return -1;
}
*out = bstr_splice(ctx->str, 0, next);
ctx->str = bstr_cut(ctx->str, next+2);
return 1;
}
return read_token(ctx->str, &ctx->str, out) ? 1 : 0;
}
static struct mp_cmd *parse_cmd_str(struct mp_log *log, void *tmp,
bstr *str, const char *loc)
{
struct parse_ctx *ctx = &(struct parse_ctx){
.log = log,
.tmp = tmp,
.str = *str,
.start = *str,
};
struct mp_cmd *cmd = talloc_ptrtype(NULL, cmd);
talloc_set_destructor(cmd, destroy_cmd);
*cmd = (struct mp_cmd) {
.flags = MP_ON_OSD_AUTO | MP_EXPAND_PROPERTIES,
.scale = 1,
.scale_units = 1,
};
ctx->str = bstr_lstrip(ctx->str);
bstr cur_token;
if (pctx_read_token(ctx, &cur_token) < 0)
goto error;
while (1) {
if (!apply_flag(cmd, cur_token))
break;
if (pctx_read_token(ctx, &cur_token) < 0)
goto error;
}
if (!find_cmd(ctx->log, cmd, cur_token))
goto error;
for (int i = 0; i < MP_CMD_MAX_ARGS; i++) {
const struct m_option *opt = get_arg_type(cmd->def, i);
if (!opt)
break;
int r = pctx_read_token(ctx, &cur_token);
if (r < 0) {
MP_ERR(ctx, "Command %s: error in argument %d.\n", cmd->name, i + 1);
goto error;
}
if (r < 1)
break;
struct mp_cmd_arg arg = {.type = opt};
r = m_option_parse(ctx->log, opt, bstr0(cmd->name), cur_token, &arg.v);
if (r < 0) {
MP_ERR(ctx, "Command %s: argument %d can't be parsed: %s.\n",
cmd->name, i + 1, m_option_strerror(r));
goto error;
}
MP_TARRAY_APPEND(cmd, cmd->args, cmd->nargs, arg);
}
if (!finish_cmd(ctx->log, cmd))
goto error;
bstr dummy;
if (read_token(ctx->str, &dummy, &dummy) && ctx->str.len) {
MP_ERR(ctx, "Command %s has trailing unused arguments: '%.*s'.\n",
cmd->name, BSTR_P(ctx->str));
// Better make it fatal to make it clear something is wrong.
goto error;
}
bstr orig = {ctx->start.start, ctx->str.start - ctx->start.start};
cmd->original = bstrto0(cmd, bstr_strip(orig));
*str = ctx->str;
return cmd;
error:
MP_ERR(ctx, "Command was defined at %s.\n", loc);
talloc_free(cmd);
*str = ctx->str;
return NULL;
}
mp_cmd_t *mp_input_parse_cmd_str(struct mp_log *log, bstr str, const char *loc)
{
void *tmp = talloc_new(NULL);
bstr original = str;
struct mp_cmd *cmd = parse_cmd_str(log, tmp, &str, loc);
if (!cmd)
goto done;
// Handle "multi" commands
struct mp_cmd **p_prev = NULL;
while (1) {
str = bstr_lstrip(str);
// read_token just to check whether it's trailing whitespace only
bstr u1, u2;
if (!bstr_eatstart0(&str, ";") || !read_token(str, &u1, &u2))
break;
// Multi-command. Since other input.c code uses queue_next for its
// own purposes, a pseudo-command is used to wrap the command list.
if (!p_prev) {
struct mp_cmd *list = talloc_ptrtype(NULL, list);
talloc_set_destructor(list, destroy_cmd);
*list = (struct mp_cmd) {
.name = (char *)mp_cmd_list.name,
.def = &mp_cmd_list,
};
talloc_steal(list, cmd);
struct mp_cmd_arg arg = {0};
arg.v.p = cmd;
list->args = talloc_dup(list, &arg);
p_prev = &cmd->queue_next;
cmd = list;
}
struct mp_cmd *sub = parse_cmd_str(log, tmp, &str, loc);
if (!sub) {
talloc_free(cmd);
cmd = NULL;
goto done;
}
talloc_steal(cmd, sub);
*p_prev = sub;
p_prev = &sub->queue_next;
}
cmd->original = bstrto0(cmd, bstr_strip(
bstr_splice(original, 0, str.start - original.start)));
str = bstr_strip(str);
if (bstr_eatstart0(&str, "#") && !bstr_startswith0(str, "#")) {
str = bstr_strip(str);
if (str.len)
cmd->desc = bstrto0(cmd, str);
}
done:
talloc_free(tmp);
return cmd;
}
struct mp_cmd *mp_input_parse_cmd_strv(struct mp_log *log, const char **argv)
{
int count = 0;
while (argv[count])
count++;
mpv_node *items = talloc_zero_array(NULL, mpv_node, count);
mpv_node_list list = {.values = items, .num = count};
mpv_node node = {.format = MPV_FORMAT_NODE_ARRAY, .u = {.list = &list}};
for (int n = 0; n < count; n++) {
items[n] = (mpv_node){.format = MPV_FORMAT_STRING,
.u = {.string = (char *)argv[n]}};
}
struct mp_cmd *res = mp_input_parse_cmd_node(log, &node);
talloc_free(items);
return res;
}
void mp_cmd_free(mp_cmd_t *cmd)
{
talloc_free(cmd);
}
mp_cmd_t *mp_cmd_clone(mp_cmd_t *cmd)
{
if (!cmd)
return NULL;
mp_cmd_t *ret = talloc_dup(NULL, cmd);
talloc_set_destructor(ret, destroy_cmd);
ret->name = talloc_strdup(ret, cmd->name);
ret->args = talloc_zero_array(ret, struct mp_cmd_arg, ret->nargs);
for (int i = 0; i < ret->nargs; i++) {
ret->args[i].type = cmd->args[i].type;
m_option_copy(ret->args[i].type, &ret->args[i].v, &cmd->args[i].v);
}
ret->original = talloc_strdup(ret, cmd->original);
ret->desc = talloc_strdup(ret, cmd->desc);
ret->sender = NULL;
ret->key_name = talloc_strdup(ret, ret->key_name);
ret->key_text = talloc_strdup(ret, ret->key_text);
if (cmd->def == &mp_cmd_list) {
struct mp_cmd *prev = NULL;
for (struct mp_cmd *sub = cmd->args[0].v.p; sub; sub = sub->queue_next) {
sub = mp_cmd_clone(sub);
talloc_steal(ret, sub);
if (prev) {
prev->queue_next = sub;
} else {
struct mp_cmd_arg arg = {0};
arg.v.p = sub;
ret->args = talloc_dup(ret, &arg);
}
prev = sub;
}
}
return ret;
}
static int get_arg_count(const struct mp_cmd_def *cmd)
{
for (int i = MP_CMD_DEF_MAX_ARGS - 1; i >= 0; i--) {
if (cmd->args[i].type)
return i + 1;
}
return 0;
}
void mp_cmd_dump(struct mp_log *log, int msgl, char *header, struct mp_cmd *cmd)
{
if (!mp_msg_test(log, msgl))
return;
if (header)
mp_msg(log, msgl, "%s ", header);
if (!cmd) {
mp_msg(log, msgl, "(NULL)\n");
return;
}
mp_msg(log, msgl, "%s, flags=%d, args=[", cmd->name, cmd->flags);
int argc = get_arg_count(cmd->def);
for (int n = 0; n < cmd->nargs; n++) {
const char *argname = cmd->def->args[MPMIN(n, argc - 1)].name;
char *s = m_option_print(cmd->args[n].type, &cmd->args[n].v);
if (n)
mp_msg(log, msgl, ", ");
struct mpv_node node = {
.format = MPV_FORMAT_STRING,
.u.string = s ? s : "(NULL)",
};
char *esc = NULL;
json_write(&esc, &node);
mp_msg(log, msgl, "%s=%s", argname, esc ? esc : "<error>");
talloc_free(esc);
talloc_free(s);
}
mp_msg(log, msgl, "]\n");
}
bool mp_input_is_repeatable_cmd(struct mp_cmd *cmd)
{
return (cmd->def->allow_auto_repeat) || cmd->def == &mp_cmd_list ||
(cmd->flags & MP_ALLOW_REPEAT);
}
bool mp_input_is_scalable_cmd(struct mp_cmd *cmd)
{
return cmd->def->scalable;
}
void mp_print_cmd_list(struct mp_log *out)
{
for (int i = 0; mp_cmds[i].name; i++) {
const struct mp_cmd_def *def = &mp_cmds[i];
mp_info(out, "%-20.20s", def->name);
for (int j = 0; j < MP_CMD_DEF_MAX_ARGS && def->args[j].type; j++) {
const struct m_option *arg = &def->args[j];
bool is_opt = arg->defval || (arg->flags & MP_CMD_OPT_ARG);
mp_info(out, " %s%s=%s%s", is_opt ? "[" : "", arg->name,
arg->type->name, is_opt ? "]" : "");
}
if (def->vararg)
mp_info(out, "..."); // essentially append to last argument
mp_info(out, "\n");
}
}
static int parse_cycle_dir(struct mp_log *log, const struct m_option *opt,
struct bstr name, struct bstr param, void *dst)
{
double val;
if (bstrcmp0(param, "up") == 0) {
val = +1;
} else if (bstrcmp0(param, "down") == 0) {
val = -1;
} else {
return m_option_type_double.parse(log, opt, name, param, dst);
}
*(double *)dst = val;
return 1;
}
static char *print_cycle_dir(const m_option_t *opt, const void *val)
{
return talloc_asprintf(NULL, "%f", *(double *)val);
}
static void copy_opt(const m_option_t *opt, void *dst, const void *src)
{
if (dst && src)
memcpy(dst, src, opt->type->size);
}
const struct m_option_type m_option_type_cycle_dir = {
.name = "up|down",
.parse = parse_cycle_dir,
.print = print_cycle_dir,
.copy = copy_opt,
.size = sizeof(double),
};