mirror of https://github.com/zulip/zulip.git
364 lines
14 KiB
JavaScript
364 lines
14 KiB
JavaScript
import $ from "jquery";
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import TurndownService from "turndown";
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import * as compose_ui from "./compose_ui";
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import * as message_lists from "./message_lists";
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import {page_params} from "./page_params";
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import * as rows from "./rows";
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function find_boundary_tr($initial_tr, iterate_row) {
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let j;
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let skip_same_td_check = false;
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let $tr = $initial_tr;
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// If the selection boundary is somewhere that does not have a
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// parent tr, we should let the browser handle the copy-paste
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// entirely on its own
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if ($tr.length === 0) {
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return undefined;
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}
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// If the selection boundary is on a table row that does not have an
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// associated message id (because the user clicked between messages),
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// then scan downwards until we hit a table row with a message id.
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// To ensure we can't enter an infinite loop, bail out (and let the
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// browser handle the copy-paste on its own) if we don't hit what we
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// are looking for within 10 rows.
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for (j = 0; !$tr.is(".message_row") && j < 10; j += 1) {
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$tr = iterate_row($tr);
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}
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if (j === 10) {
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return undefined;
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} else if (j !== 0) {
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// If we updated tr, then we are not dealing with a selection
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// that is entirely within one td, and we can skip the same td
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// check (In fact, we need to because it won't work correctly
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// in this case)
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skip_same_td_check = true;
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}
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return [rows.id($tr), skip_same_td_check];
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}
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function construct_recipient_header($message_row) {
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const message_header_content = rows
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.get_message_recipient_header($message_row)
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.text()
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.replace(/\s+/g, " ")
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.replace(/^\s/, "")
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.replace(/\s$/, "");
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return $("<p>").append($("<strong>").text(message_header_content));
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}
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/*
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The techniques we use in this code date back to
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2013 and may be obsolete today (and may not have
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been even the best workaround back then).
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https://github.com/zulip/zulip/commit/fc0b7c00f16316a554349f0ad58c6517ebdd7ac4
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The idea is that we build a temp div, let jQuery process the
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selection, then restore the selection on a zero-second timer back
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to the original selection.
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Do not be afraid to change this code if you understand
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how modern browsers deal with copy/paste. Just test
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your changes carefully.
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*/
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function construct_copy_div($div, start_id, end_id) {
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const copy_rows = rows.visible_range(start_id, end_id);
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const $start_row = copy_rows[0];
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const $start_recipient_row = rows.get_message_recipient_row($start_row);
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const start_recipient_row_id = rows.id_for_recipient_row($start_recipient_row);
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let should_include_start_recipient_header = false;
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let last_recipient_row_id = start_recipient_row_id;
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for (const $row of copy_rows) {
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const recipient_row_id = rows.id_for_recipient_row(rows.get_message_recipient_row($row));
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// if we found a message from another recipient,
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// it means that we have messages from several recipients,
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// so we have to add new recipient's bar to final copied message
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// and wouldn't forget to add start_recipient's bar at the beginning of final message
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if (recipient_row_id !== last_recipient_row_id) {
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$div.append(construct_recipient_header($row));
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last_recipient_row_id = recipient_row_id;
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should_include_start_recipient_header = true;
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}
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const message = message_lists.current.get(rows.id($row));
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const $content = $(message.content);
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$content.first().prepend(message.sender_full_name + ": ");
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$div.append($content);
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}
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if (should_include_start_recipient_header) {
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$div.prepend(construct_recipient_header($start_row));
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}
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}
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function select_div($div, selection) {
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$div.css({
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position: "absolute",
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left: "-99999px",
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// Color and background is made according to "light theme"
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// exclusively here because when copying the content
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// into, say, Gmail compose box, the styles come along.
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// This is done to avoid copying the content with dark
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// background when using the app in dark theme.
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// We can avoid other custom styles since they are wrapped
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// inside another parent such as `.message_content`.
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color: "#333",
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background: "#FFF",
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}).attr("id", "copytempdiv");
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$("body").append($div);
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selection.selectAllChildren($div[0]);
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}
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function remove_div(div, ranges, selection) {
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window.setTimeout(() => {
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selection = window.getSelection();
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selection.removeAllRanges();
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for (const range of ranges) {
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selection.addRange(range);
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}
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$("#copytempdiv").remove();
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}, 0);
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}
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export function copy_handler() {
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// This is the main handler for copying message content via
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// `Ctrl+C` in Zulip (note that this is totally independent of the
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// "select region" copy behavior on Linux; that is handled
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// entirely by the browser, our HTML layout, and our use of the
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// no-select/auto-select CSS classes). We put considerable effort
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// into producing a nice result that pastes well into other tools.
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// Our user-facing specification is the following:
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//
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// * If the selection is contained within a single message, we
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// want to just copy the portion that was selected, which we
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// implement by letting the browser handle the Ctrl+C event.
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//
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// * Otherwise, we want to copy the bodies of all messages that
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// were partially covered by the selection.
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const selection = window.getSelection();
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const analysis = analyze_selection(selection);
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const ranges = analysis.ranges;
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const start_id = analysis.start_id;
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const end_id = analysis.end_id;
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const skip_same_td_check = analysis.skip_same_td_check;
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const $div = $("<div>");
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if (start_id === undefined || end_id === undefined) {
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// In this case either the starting message or the ending
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// message is not defined, so this is definitely not a
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// multi-message selection and we can let the browser handle
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// the copy.
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document.execCommand("copy");
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return;
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}
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if (!skip_same_td_check && start_id === end_id) {
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// Check whether the selection both starts and ends in the
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// same message. If so, Let the browser handle this.
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document.execCommand("copy");
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return;
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}
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// We've now decided to handle the copy event ourselves.
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//
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// We construct a temporary div for what we want the copy to pick up.
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// We construct the div only once, rather than for each range as we can
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// determine the starting and ending point with more confidence for the
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// whole selection. When constructing for each `Range`, there is a high
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// chance for overlaps between same message ids, avoiding which is much
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// more difficult since we can get a range (start_id and end_id) for
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// each selection `Range`.
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construct_copy_div($div, start_id, end_id);
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// Select div so that the browser will copy it
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// instead of copying the original selection
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select_div($div, selection);
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document.execCommand("copy");
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remove_div($div, ranges, selection);
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}
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export function analyze_selection(selection) {
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// Here we analyze our selection to determine if part of a message
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// or multiple messages are selected.
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//
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// Firefox and Chrome handle selection of multiple messages
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// differently. Firefox typically creates multiple ranges for the
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// selection, whereas Chrome typically creates just one.
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//
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// Our goal in the below loop is to compute and be prepared to
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// analyze the combined range of the selections, and copy their
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// full content.
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let i;
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let range;
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const ranges = [];
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let $startc;
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let $endc;
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let $initial_end_tr;
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let start_id;
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let end_id;
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let start_data;
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let end_data;
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// skip_same_td_check is true whenever we know for a fact that the
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// selection covers multiple messages (and thus we should no
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// longer consider letting the browser handle the copy event).
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let skip_same_td_check = false;
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for (i = 0; i < selection.rangeCount; i += 1) {
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range = selection.getRangeAt(i);
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ranges.push(range);
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$startc = $(range.startContainer);
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start_data = find_boundary_tr(
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$startc.parents(".selectable_row, .message_header").first(),
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($row) => $row.next(),
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);
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if (start_data === undefined) {
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// Skip any selection sections that don't intersect a message.
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continue;
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}
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if (start_id === undefined) {
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// start_id is the Zulip message ID of the first message
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// touched by the selection.
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start_id = start_data[0];
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}
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$endc = $(range.endContainer);
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$initial_end_tr = get_end_tr_from_endc($endc);
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end_data = find_boundary_tr($initial_end_tr, ($row) => $row.prev());
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if (end_data === undefined) {
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// Skip any selection sections that don't intersect a message.
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continue;
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}
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if (end_data[0] !== undefined) {
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end_id = end_data[0];
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}
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if (start_data[1] || end_data[1]) {
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// If the find_boundary_tr call for either the first or
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// the last message covered by the selection
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skip_same_td_check = true;
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}
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}
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return {
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ranges,
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start_id,
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end_id,
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skip_same_td_check,
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};
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}
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function get_end_tr_from_endc($endc) {
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if ($endc.attr("id") === "bottom_whitespace" || $endc.attr("id") === "compose_close") {
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// If the selection ends in the bottom whitespace, we should
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// act as though the selection ends on the final message.
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// This handles the issue that Chrome seems to like selecting
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// the compose_close button when you go off the end of the
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// last message
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return $(".message_row").last();
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}
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// Sometimes (especially when three click selecting in Chrome) the selection
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// can end in a hidden element in e.g. the next message, a date divider.
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// We can tell this is the case because the selection isn't inside a
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// `messagebox-content` div, which is where the message text itself is.
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// TODO: Ideally make it so that the selection cannot end there.
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// For now, we find find the message row directly above wherever the
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// selection ended.
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if ($endc.closest(".messagebox-content").length === 0) {
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// If the selection ends within the message following the selected
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// messages, go back to use the actual last message.
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if ($endc.parents(".message_row").length > 0) {
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const $parent_msg = $endc.parents(".message_row").first();
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return $parent_msg.prev(".message_row");
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}
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// If it's not in a .message_row, it's probably in a .message_header and
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// we can use the last message from the previous recipient_row.
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if ($endc.parents(".message_header").length > 0) {
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const $overflow_recipient_row = $endc.parents(".recipient_row").first();
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return $overflow_recipient_row.prev(".recipient_row").last(".message_row");
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}
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// If somehow we get here, do the default return.
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}
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return $endc.parents(".selectable_row").first();
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}
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export function paste_handler_converter(paste_html) {
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const turndownService = new TurndownService();
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turndownService.addRule("headings", {
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filter: ["h1", "h2", "h3", "h4", "h5", "h6"],
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replacement(content) {
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return content;
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},
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});
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turndownService.addRule("emphasis", {
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filter: ["em", "i"],
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replacement(content) {
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return "*" + content + "*";
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},
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});
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// Checks for raw links without custom text or title.
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turndownService.addRule("links", {
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filter(node) {
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return (
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node.nodeName === "A" && node.href === node.innerHTML && node.href === node.title
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);
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},
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replacement(content) {
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return content;
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},
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});
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let markdown_text = turndownService.turndown(paste_html);
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// Checks for escaped ordered list syntax.
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markdown_text = markdown_text.replace(/^(\W* {0,3})(\d+)\\\. /gm, "$1$2. ");
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// Removes newlines before the start of a list and between list elements.
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markdown_text = markdown_text.replace(/\n+([*+-])/g, "\n$1");
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return markdown_text;
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}
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export function paste_handler(event) {
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const clipboardData = event.originalEvent.clipboardData;
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if (!clipboardData) {
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// On IE11, ClipboardData isn't defined. One can instead
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// access it with `window.clipboardData`, but even that
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// doesn't support text/html, so this code path couldn't do
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// anything special anyway. So we instead just let the
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// default paste handler run on IE11.
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return;
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}
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if (clipboardData.getData) {
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const paste_html = clipboardData.getData("text/html");
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if (paste_html && page_params.development_environment) {
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const text = paste_handler_converter(paste_html);
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const mdImageRegex = /^!\[.*]\(.*\)$/;
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if (mdImageRegex.test(text)) {
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// This block catches cases where we are pasting an
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// image into Zulip, which is handled by upload.js.
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return;
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}
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event.preventDefault();
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event.stopPropagation();
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compose_ui.insert_syntax_and_focus(text);
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}
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}
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}
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export function initialize() {
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$("#compose-textarea").on("paste", paste_handler);
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$("body").on("paste", ".message_edit_form", paste_handler);
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}
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