mirror of https://github.com/zulip/zulip.git
577 lines
17 KiB
JavaScript
577 lines
17 KiB
JavaScript
const util = require("./util");
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function MessageListData(opts) {
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this.muting_enabled = opts.muting_enabled;
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if (this.muting_enabled) {
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this._all_items = [];
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}
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this._items = [];
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this._hash = new Map();
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this._local_only = new Set();
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this._selected_id = -1;
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let filter = opts.filter;
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if (filter === undefined) {
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filter = new Filter();
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}
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this.filter = filter;
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this.fetch_status = FetchStatus();
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}
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MessageListData.prototype = {
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all_messages() {
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return this._items;
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},
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num_items() {
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return this._items.length;
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},
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empty() {
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return this._items.length === 0;
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},
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first() {
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return this._items[0];
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},
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last() {
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return this._items[this._items.length - 1];
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},
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select_idx() {
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if (this._selected_id === -1) {
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return;
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}
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const ids = this._items.map((message) => message.id);
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const i = ids.indexOf(this._selected_id);
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if (i === -1) {
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return;
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}
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return i;
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},
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prev() {
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const i = this.select_idx();
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if (i === undefined) {
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return;
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}
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if (i === 0) {
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return;
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}
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return this._items[i - 1].id;
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},
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next() {
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const i = this.select_idx();
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if (i === undefined) {
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return;
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}
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if (i + 1 >= this._items.length) {
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return;
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}
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return this._items[i + 1].id;
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},
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is_at_end() {
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if (this._selected_id === -1) {
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return false;
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}
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const n = this._items.length;
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if (n === 0) {
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return false;
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}
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const last_msg = this._items[n - 1];
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return last_msg.id === this._selected_id;
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},
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nth_most_recent_id(n) {
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const i = this._items.length - n;
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if (i < 0) {
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return -1;
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}
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return this._items[i].id;
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},
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clear() {
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if (this.muting_enabled) {
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this._all_items = [];
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}
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this._items = [];
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this._hash.clear();
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},
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get(id) {
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id = parseFloat(id);
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if (isNaN(id)) {
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return;
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}
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return this._hash.get(id);
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},
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clear_selected_id() {
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this._selected_id = -1;
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},
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selected_id() {
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return this._selected_id;
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},
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set_selected_id(id) {
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this._selected_id = id;
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},
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selected_idx() {
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return this._lower_bound(this._selected_id);
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},
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reset_select_to_closest() {
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this._selected_id = this.closest_id(this._selected_id);
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},
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is_search() {
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return this.filter.is_search();
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},
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can_mark_messages_read() {
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return this.filter.can_mark_messages_read();
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},
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_get_predicate() {
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// We cache this.
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if (!this.predicate) {
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this.predicate = this.filter.predicate();
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}
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return this.predicate;
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},
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valid_non_duplicated_messages(messages) {
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const predicate = this._get_predicate();
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const self = this;
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return messages.filter((msg) => self.get(msg.id) === undefined && predicate(msg));
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},
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filter_incoming(messages) {
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const predicate = this._get_predicate();
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return messages.filter(predicate);
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},
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unmuted_messages(messages) {
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return messages.filter(
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(message) =>
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!muting.is_topic_muted(message.stream_id, message.topic) || message.mentioned,
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);
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},
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update_items_for_muting() {
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if (!this.muting_enabled) {
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return;
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}
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this._items = this.unmuted_messages(this._all_items);
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},
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first_unread_message_id() {
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const first_unread = this._items.find((message) => unread.message_unread(message));
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if (first_unread) {
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return first_unread.id;
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}
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// if no unread, return the bottom message
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return this.last().id;
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},
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update_user_full_name(user_id, full_name) {
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for (const item of this._items) {
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if (item.sender_id && item.sender_id === user_id) {
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item.sender_full_name = full_name;
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}
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}
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},
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update_user_avatar(user_id, avatar_url) {
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// TODO:
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// We may want to de-dup some logic with update_user_full_name,
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// especially if we want to optimize this with some kind of
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// hash that maps sender_id -> messages.
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for (const item of this._items) {
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if (item.sender_id && item.sender_id === user_id) {
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item.small_avatar_url = avatar_url;
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}
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}
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},
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update_stream_name(stream_id, new_stream_name) {
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for (const item of this._items) {
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if (item.stream_id && item.stream_id === stream_id) {
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item.display_recipient = new_stream_name;
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item.stream = new_stream_name;
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}
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}
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},
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add_messages(messages) {
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const self = this;
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let top_messages = [];
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let bottom_messages = [];
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let interior_messages = [];
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// If we're initially populating the list, save the messages in
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// bottom_messages regardless
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if (self.selected_id() === -1 && self.empty()) {
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const narrow_messages = self.filter_incoming(messages);
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bottom_messages = narrow_messages.filter((msg) => !self.get(msg.id));
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} else {
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// Filter out duplicates that are already in self, and all messages
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// that fail our filter predicate
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messages = self.valid_non_duplicated_messages(messages);
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for (const msg of messages) {
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// Put messages in correct order on either side of the
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// message list. This code path assumes that messages
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// is a (1) sorted, and (2) consecutive block of
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// messages that belong in this message list; those
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// facts should be ensured by the caller.
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if (self.empty() || msg.id > self.last().id) {
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bottom_messages.push(msg);
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} else if (msg.id < self.first().id) {
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top_messages.push(msg);
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} else {
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interior_messages.push(msg);
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}
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}
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}
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if (interior_messages.length > 0) {
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interior_messages = self.add_anywhere(interior_messages);
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}
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if (top_messages.length > 0) {
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top_messages = self.prepend(top_messages);
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}
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if (bottom_messages.length > 0) {
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bottom_messages = self.append(bottom_messages);
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}
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const info = {
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top_messages,
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bottom_messages,
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interior_messages,
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};
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return info;
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},
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add_anywhere(messages) {
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// Caller should have already filtered messages.
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// This should be used internally when we have
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// "interior" messages to add and can't optimize
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// things by only doing prepend or only doing append.
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let viewable_messages;
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if (this.muting_enabled) {
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this._all_items = messages.concat(this._all_items);
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this._all_items.sort((a, b) => a.id - b.id);
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viewable_messages = this.unmuted_messages(messages);
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this._items = viewable_messages.concat(this._items);
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} else {
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viewable_messages = messages;
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this._items = messages.concat(this._items);
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}
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this._items.sort((a, b) => a.id - b.id);
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this._add_to_hash(messages);
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return viewable_messages;
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},
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append(messages) {
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// Caller should have already filtered
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let viewable_messages;
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if (this.muting_enabled) {
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this._all_items = this._all_items.concat(messages);
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viewable_messages = this.unmuted_messages(messages);
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} else {
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viewable_messages = messages;
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}
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this._items = this._items.concat(viewable_messages);
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this._add_to_hash(messages);
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return viewable_messages;
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},
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prepend(messages) {
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// Caller should have already filtered
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let viewable_messages;
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if (this.muting_enabled) {
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this._all_items = messages.concat(this._all_items);
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viewable_messages = this.unmuted_messages(messages);
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} else {
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viewable_messages = messages;
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}
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this._items = viewable_messages.concat(this._items);
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this._add_to_hash(messages);
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return viewable_messages;
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},
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remove(messages) {
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const self = this;
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for (const message of messages) {
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const stored_message = self._hash.get(message.id);
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if (stored_message !== undefined) {
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self._hash.delete(stored_message);
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}
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self._local_only.delete(message.id);
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}
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const msg_ids_to_remove = new Set();
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for (const message of messages) {
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msg_ids_to_remove.add(message.id);
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}
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this._items = this._items.filter((message) => !msg_ids_to_remove.has(message.id));
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if (this.muting_enabled) {
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this._all_items = this._all_items.filter(
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(message) => !msg_ids_to_remove.has(message.id),
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);
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}
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},
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// Returns messages from the given message list in the specified range, inclusive
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message_range(start, end) {
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if (start === -1) {
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blueslip.error("message_range given a start of -1");
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}
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const start_idx = this._lower_bound(start);
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const end_idx = this._lower_bound(end);
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return this._items.slice(start_idx, end_idx + 1);
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},
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// Returns the index where you could insert the desired ID
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// into the message list, without disrupting the sort order
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// This takes into account the potentially-unsorted
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// nature of local message IDs in the message list
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_lower_bound(id) {
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const self = this;
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function less_func(msg, ref_id, a_idx) {
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if (self._is_localonly_id(msg.id)) {
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// First non-local message before this one
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const effective = self._next_nonlocal_message(self._items, a_idx, (idx) => idx - 1);
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if (effective) {
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// Turn the 10.02 in [11, 10.02, 12] into 11.02
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const decimal = parseFloat((msg.id % 1).toFixed(0.02));
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const effective_id = effective.id + decimal;
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return effective_id < ref_id;
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}
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}
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return msg.id < ref_id;
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}
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return util.lower_bound(self._items, id, less_func);
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},
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closest_id(id) {
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// We directly keep track of local-only messages,
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// so if we're asked for one that we know we have,
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// just return it directly
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if (this._local_only.has(id)) {
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return id;
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}
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const items = this._items;
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if (items.length === 0) {
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return -1;
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}
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let closest = this._lower_bound(id);
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if (closest < items.length && id === items[closest].id) {
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return items[closest].id;
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}
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const potential_closest_matches = [];
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if (closest > 0 && this._is_localonly_id(items[closest - 1].id)) {
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// Since we treated all blocks of local ids as their left-most-non-local message
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// for lower_bound purposes, find the real leftmost index (first non-local id)
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do {
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potential_closest_matches.push(closest);
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closest -= 1;
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} while (closest > 0 && this._is_localonly_id(items[closest - 1].id));
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}
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potential_closest_matches.push(closest);
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if (closest === items.length) {
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closest = closest - 1;
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} else {
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// Any of the ids that we skipped over (due to them being local-only) might be the
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// closest ID to the desired one, in case there is no exact match.
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potential_closest_matches.unshift(_.last(potential_closest_matches) - 1);
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let best_match = items[closest].id;
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for (const potential_idx of potential_closest_matches) {
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if (potential_idx < 0) {
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continue;
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}
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const item = items[potential_idx];
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if (item === undefined) {
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blueslip.warn("Invalid potential_idx: " + potential_idx);
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continue;
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}
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const potential_match = item.id;
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// If the potential id is the closest to the requested, save that one
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if (Math.abs(id - potential_match) < Math.abs(best_match - id)) {
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best_match = potential_match;
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closest = potential_idx;
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}
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}
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}
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return items[closest].id;
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},
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advance_past_messages(msg_ids) {
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// Start with the current pointer, but then keep advancing the
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// pointer while the next message's id is in msg_ids. See trac #1555
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// for more context, but basically we are skipping over contiguous
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// messages that we have recently visited.
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let next_msg_id = 0;
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const id_set = new Set(msg_ids);
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let idx = this.selected_idx() + 1;
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while (idx < this._items.length) {
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const msg_id = this._items[idx].id;
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if (!id_set.has(msg_id)) {
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break;
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}
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next_msg_id = msg_id;
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idx += 1;
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}
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if (next_msg_id > 0) {
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this.set_selected_id(next_msg_id);
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}
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},
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_add_to_hash(messages) {
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const self = this;
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messages.forEach((elem) => {
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const id = parseFloat(elem.id);
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if (isNaN(id)) {
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blueslip.fatal("Bad message id");
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}
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if (self._is_localonly_id(id)) {
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self._local_only.add(id);
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}
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if (self._hash.has(id)) {
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blueslip.error("Duplicate message added to MessageListData");
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return;
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}
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self._hash.set(id, elem);
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});
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},
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_is_localonly_id(id) {
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return id % 1 !== 0;
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},
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_next_nonlocal_message(item_list, start_index, op) {
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let cur_idx = start_index;
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do {
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cur_idx = op(cur_idx);
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} while (item_list[cur_idx] !== undefined && this._is_localonly_id(item_list[cur_idx].id));
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return item_list[cur_idx];
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},
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change_message_id(old_id, new_id, opts) {
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// Update our local cache that uses the old id to the new id
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if (this._hash.has(old_id)) {
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const msg = this._hash.get(old_id);
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this._hash.delete(old_id);
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this._hash.set(new_id, msg);
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} else {
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return;
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}
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if (this._local_only.has(old_id)) {
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if (this._is_localonly_id(new_id)) {
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this._local_only.add(new_id);
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}
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this._local_only.delete(old_id);
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}
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if (this._selected_id === old_id) {
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this._selected_id = new_id;
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}
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this.reorder_messages(new_id, opts);
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},
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reorder_messages(new_id, opts) {
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function message_sort_func(a, b) {
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return a.id - b.id;
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}
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// If this message is now out of order, re-order and re-render
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const self = this;
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const current_message = self._hash.get(new_id);
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const index = self._items.indexOf(current_message);
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if (index === -1) {
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if (!self.muting_enabled && opts.is_current_list()) {
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blueslip.error(
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"Trying to re-order message but can't find message with new_id in _items!",
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);
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}
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return;
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}
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const next = self._next_nonlocal_message(self._items, index, (idx) => idx + 1);
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const prev = self._next_nonlocal_message(self._items, index, (idx) => idx - 1);
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if (
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(next !== undefined && current_message.id > next.id) ||
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(prev !== undefined && current_message.id < prev.id)
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) {
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blueslip.debug("Changed message ID from server caused out-of-order list, reordering");
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self._items.sort(message_sort_func);
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if (self.muting_enabled) {
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self._all_items.sort(message_sort_func);
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}
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// The data updates above need to happen synchronously,
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// but the rerendering can be deferred. It's unclear
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// whether this deferral is necessary; it was present in
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// the original 2013 local echo implementation but we
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// don't have records for why we added it then.
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setTimeout(opts.re_render, 0);
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}
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},
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|
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get_last_message_sent_by_me() {
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const msg_index = _.findLastIndex(this._items, {sender_id: page_params.user_id});
|
|
if (msg_index === -1) {
|
|
return;
|
|
}
|
|
const msg = this._items[msg_index];
|
|
return msg;
|
|
},
|
|
};
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|
|
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module.exports = MessageListData;
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|
|
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window.MessageListData = MessageListData;
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