mirror of https://github.com/mpv-player/mpv
input: add a function to parse mpv_node as command
For future client API enhancements.
This commit is contained in:
wm4
parent
2f28e071c8
commit
63903c27bd
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@ -27,6 +27,8 @@
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#include "cmd_list.h"
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#include "input.h"
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#include "libmpv/client.h"
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static void destroy_cmd(void *ptr)
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{
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struct mp_cmd *cmd = ptr;
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@ -118,10 +120,152 @@ static const struct flag cmd_flags[] = {
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{0}
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};
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static bool apply_flag(struct mp_cmd *cmd, bstr str)
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{
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for (int n = 0; cmd_flags[n].name; n++) {
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if (bstr_equals0(str, cmd_flags[n].name)) {
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cmd->flags = (cmd->flags & ~cmd_flags[n].remove) | cmd_flags[n].add;
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return true;
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}
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}
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return false;
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}
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static bool find_cmd(struct mp_log *log, struct mp_cmd *cmd, bstr name)
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{
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if (name.len == 0) {
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mp_err(log, "Command name missing.\n");
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return false;
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}
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for (int n = 0; mp_cmds[n].name; n++) {
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if (bstr_equals0(name, mp_cmds[n].name)) {
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cmd->def = &mp_cmds[n];
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cmd->name = (char *)cmd->def->name;
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cmd->id = cmd->def->id;
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return true;
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}
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}
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mp_err(log, "Command '%.*s' not found.\n", BSTR_P(name));
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return false;
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}
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static bool is_vararg(const struct mp_cmd_def *m, int i)
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{
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return m->vararg && (i + 1 >= MP_CMD_MAX_ARGS || !m->args[i + 1].type);
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}
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static const struct m_option *get_arg_type(const struct mp_cmd_def *cmd, int i)
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{
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if (i >= MP_CMD_MAX_ARGS)
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return NULL;
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const struct m_option *opt = &cmd->args[i];
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if (!opt->type && is_vararg(cmd, i)) {
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// The last arg in a vararg command sets all vararg types.
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for (int n = i; n >= 0; n--) {
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if (cmd->args[n].type) {
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opt = &cmd->args[n];
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break;
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}
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}
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}
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return opt->type ? opt : NULL;
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}
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// Set correct arg count, and fill in missing optional args.
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static bool finish_cmd(struct mp_log *log, struct mp_cmd *cmd)
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{
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cmd->nargs = 0;
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for (int i = 0; i < MP_CMD_MAX_ARGS; i++) {
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if (!cmd->args[i].type) {
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const struct m_option *opt = get_arg_type(cmd->def, i);
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if (!opt || is_vararg(cmd->def, i))
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break;
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if (!opt->defval && !(opt->flags & MP_CMD_OPT_ARG)) {
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mp_err(log, "Command %s: more than %d arguments required.\n",
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cmd->name, cmd->nargs);
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return false;
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}
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cmd->args[i].type = opt;
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if (opt->defval)
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m_option_copy(opt, &cmd->args[i].v, opt->defval);
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}
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if (cmd->args[i].type)
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cmd->nargs = i + 1;
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}
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return true;
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}
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struct mp_cmd *mp_input_parse_cmd_node(struct mp_log *log, mpv_node *node)
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{
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struct mp_cmd *cmd = talloc_ptrtype(NULL, cmd);
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talloc_set_destructor(cmd, destroy_cmd);
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*cmd = (struct mp_cmd) { .scale = 1, };
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if (node->format != MPV_FORMAT_NODE_ARRAY)
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goto error;
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mpv_node_list *args = node->u.list;
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int cur = 0;
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while (cur < args->num) {
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if (args->values[cur].format != MPV_FORMAT_STRING)
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break;
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if (!apply_flag(cmd, bstr0(args->values[cur].u.string)))
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break;
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cur++;
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}
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bstr cmd_name = {0};
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if (cur < args->num && args->values[cur].format == MPV_FORMAT_STRING)
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cmd_name = bstr0(args->values[cur++].u.string);
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if (!find_cmd(log, cmd, cmd_name))
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goto error;
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int first = cur;
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for (int i = 0; i < args->num - first; i++) {
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const struct m_option *opt = get_arg_type(cmd->def, i);
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if (!opt) {
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mp_err(log, "Command %s: has only %d arguments.\n", cmd->name, i);
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goto error;
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}
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mpv_node *val = &args->values[cur++];
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cmd->args[i].type = opt;
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void *dst = &cmd->args[i].v;
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if (val->format == MPV_FORMAT_STRING) {
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int r = m_option_parse(log, opt, bstr0(cmd->name),
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bstr0(val->u.string), dst);
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if (r < 0) {
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mp_err(log, "Command %s: argument %d can't be parsed: %s.\n",
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cmd->name, i + 1, m_option_strerror(r));
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goto error;
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}
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} else {
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int r = m_option_set_node(opt, dst, val);
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if (r < 0) {
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mp_err(log, "Command %s: argument %d has incompatible type.\n",
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cmd->name, i + 1);
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goto error;
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}
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}
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}
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if (!finish_cmd(log, cmd))
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goto error;
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return cmd;
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error:
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for (int n = 0; n < MP_CMD_MAX_ARGS; n++) {
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if (cmd->args[n].type)
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m_option_free(cmd->args[n].type, &cmd->args[n].v);
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}
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talloc_free(cmd);
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return NULL;
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}
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static struct mp_cmd *parse_cmd(struct parse_ctx *ctx, int def_flags)
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{
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struct mp_cmd *cmd = NULL;
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int r;
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struct mp_cmd *cmd = talloc_ptrtype(NULL, cmd);
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talloc_set_destructor(cmd, destroy_cmd);
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*cmd = (struct mp_cmd) { .flags = def_flags, .scale = 1, };
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if (!ctx->array_input) {
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ctx->str = bstr_lstrip(ctx->str);
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@ -139,80 +283,31 @@ static struct mp_cmd *parse_cmd(struct parse_ctx *ctx, int def_flags)
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goto error;
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while (1) {
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for (int n = 0; cmd_flags[n].name; n++) {
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if (bstr_equals0(cur_token, cmd_flags[n].name)) {
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if (pctx_read_token(ctx, &cur_token) < 0)
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goto error;
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def_flags &= ~cmd_flags[n].remove;
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def_flags |= cmd_flags[n].add;
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goto cont;
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}
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}
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break;
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cont: ;
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}
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if (cur_token.len == 0) {
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MP_ERR(ctx, "Command name missing.\n");
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goto error;
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}
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const struct mp_cmd_def *cmd_def = NULL;
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for (int n = 0; mp_cmds[n].name; n++) {
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if (bstr_equals0(cur_token, mp_cmds[n].name)) {
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cmd_def = &mp_cmds[n];
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if (!apply_flag(cmd, cur_token))
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break;
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}
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if (pctx_read_token(ctx, &cur_token) < 0)
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goto error;
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break;
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}
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if (!cmd_def) {
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MP_ERR(ctx, "Command '%.*s' not found.\n", BSTR_P(cur_token));
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if (!find_cmd(ctx->log, cmd, cur_token))
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goto error;
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}
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cmd = talloc_ptrtype(NULL, cmd);
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talloc_set_destructor(cmd, destroy_cmd);
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*cmd = (struct mp_cmd) {
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.name = (char *)cmd_def->name,
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.id = cmd_def->id,
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.flags = def_flags,
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.scale = 1,
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.def = cmd_def,
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};
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for (int i = 0; i < MP_CMD_MAX_ARGS; i++) {
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const struct m_option *opt = &cmd_def->args[i];
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bool is_vararg = cmd_def->vararg &&
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(i + 1 >= MP_CMD_MAX_ARGS || !cmd_def->args[i + 1].type); // last arg
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if (!opt->type && is_vararg && cmd->nargs > 0)
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opt = cmd->args[cmd->nargs - 1].type;
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if (!opt->type)
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const struct m_option *opt = get_arg_type(cmd->def, i);
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if (!opt)
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break;
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r = pctx_read_token(ctx, &cur_token);
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int r = pctx_read_token(ctx, &cur_token);
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if (r < 0) {
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MP_ERR(ctx, "Command %s: error in argument %d.\n", cmd->name, i + 1);
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goto error;
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}
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if (r < 1) {
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if (is_vararg)
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continue;
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// Skip optional arguments
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if (opt->defval || (opt->flags & MP_CMD_OPT_ARG)) {
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struct mp_cmd_arg *cmdarg = &cmd->args[cmd->nargs];
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cmdarg->type = opt;
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if (opt->defval)
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m_option_copy(opt, &cmdarg->v, opt->defval);
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cmd->nargs++;
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continue;
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}
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MP_ERR(ctx, "Command %s: more than %d arguments required.\n",
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cmd->name, cmd->nargs);
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goto error;
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}
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if (r < 1)
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break;
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struct mp_cmd_arg *cmdarg = &cmd->args[cmd->nargs];
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struct mp_cmd_arg *cmdarg = &cmd->args[i];
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cmdarg->type = opt;
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cmd->nargs++;
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r = m_option_parse(ctx->log, opt, bstr0(cmd->name), cur_token, &cmdarg->v);
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if (r < 0) {
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MP_ERR(ctx, "Command %s: argument %d can't be parsed: %s.\n",
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@ -221,6 +316,9 @@ static struct mp_cmd *parse_cmd(struct parse_ctx *ctx, int def_flags)
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}
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}
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if (!finish_cmd(ctx->log, cmd))
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goto error;
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bstr left = pctx_get_trailing(ctx);
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if (left.len) {
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MP_ERR(ctx, "Command %s has trailing unused arguments: '%.*s'.\n",
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@ -20,6 +20,7 @@
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struct mp_log;
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struct mp_cmd;
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struct mpv_node;
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// Parse text and return corresponding struct mp_cmd.
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// The location parameter is for error messages.
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@ -36,6 +37,7 @@ struct mp_cmd *mp_input_parse_cmd_strv(struct mp_log *log, int def_flags,
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struct mp_cmd *mp_input_parse_cmd_bstrv(struct mp_log *log, int def_flags,
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int argc, bstr *argv,
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const char *location);
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struct mp_cmd *mp_input_parse_cmd_node(struct mp_log *log, struct mpv_node *node);
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// After getting a command from mp_input_get_cmd you need to free it using this
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// function
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