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/*!
* Pre-emptive page parsing edits.
*
* See also PageEditStash in PHP.
*/
$( () => {
const PRIORITY_LOW = 1;
const PRIORITY_HIGH = 2;
// Do not attempt to stash "new section" edits, because for those cases the ParserOutput
// varies on the edit summary field, and thus pre-parsing the page whilst that field is
// being typed in would be counter-productive. (The field is re-purposed for the new
// section's heading.)
const $form = $( '#editform' );
const section = $form.find( '[name=wpSection]' ).val();
if ( !$form.length || section === 'new' ) {
return;
}
let lastText, lastSummary, lastTextHash;
let lastPriority = 0;
const $text = $form.find( '#wpTextbox1' );
const $summary = $form.find( '#wpSummary' );
const model = $form.find( '[name=model]' ).val();
const format = $form.find( '[name=format]' ).val();
const revId = $form.find( '[name=parentRevId]' ).val();
// Whether the body text content changed since the last stashEdit()
function isTextChanged() {
return lastText !== $text.textSelection( 'getContents' );
}
// Whether the edit summary has changed since the last stashEdit()
function isSummaryChanged() {
return lastSummary !== $summary.textSelection( 'getContents' );
}
// Send a request to stash the edit to the API.
// If a request is in progress, abort it since its payload is stale and the API
// may limit concurrent stash parses.
const api = new mw.Api();
let stashReq;
function stashEdit() {
const textChanged = isTextChanged();
const priority = textChanged ? PRIORITY_HIGH : PRIORITY_LOW;
if ( stashReq ) {
if ( lastPriority > priority ) {
// Stash request for summary change should wait on pending text change stash
stashReq.then( checkStash );
return;
}
stashReq.abort();
}
// Update the "last" tracking variables
lastSummary = $summary.textSelection( 'getContents' );
lastPriority = priority;
if ( textChanged ) {
lastText = $text.textSelection( 'getContents' );
// Reset hash
lastTextHash = null;
}
const params = {
formatversion: 2,
action: 'stashedit',
title: mw.config.get( 'wgPageName' ),
section: section,
sectiontitle: '',
summary: lastSummary,
contentmodel: model,
contentformat: format,
baserevid: revId
};
if ( lastTextHash ) {
params.stashedtexthash = lastTextHash;
} else {
params.text = lastText;
}
const req = api.postWithToken( 'csrf', params );
stashReq = req;
req.then( ( data ) => {
if ( req === stashReq ) {
stashReq = null;
}
if ( data.stashedit && data.stashedit.texthash ) {
lastTextHash = data.stashedit.texthash;
} else {
// Request failed or text hash expired;
// include the text in a future stash request.
lastTextHash = null;
}
} );
}
// Check whether text or summary have changed and call stashEdit()
function checkStash() {
if ( !isTextChanged() && !isSummaryChanged() ) {
return;
}
stashEdit();
}
let idleTimeout = 3000;
let timer;
function onKeyUp( e ) {
// Ignore keystrokes that don't modify text, like cursor movements.
// See <http://www.javascripter.net/faq/keycodes.htm> and
// <http://www.quirksmode.org/js/keys.html>. We don't have to be exhaustive,
// because the cost of misfiring is low.
// * Key code 33-40: Page Up/Down, End, Home, arrow keys.
// * Key code 16-18: Shift, Ctrl, Alt.
if ( ( e.which >= 33 && e.which <= 40 ) || ( e.which >= 16 && e.which <= 18 ) ) {
return;
}
clearTimeout( timer );
timer = setTimeout( checkStash, idleTimeout );
}
function onSummaryFocus() {
// Summary typing is usually near the end of the workflow and involves less pausing.
// Re-stash more frequently in hopes of capturing the final summary before submission.
idleTimeout = 1000;
// Stash now since the text is likely the final version. The re-stashes based on the
// summary are targeted at caching edit checks that need the final summary.
checkStash();
}
function onTextFocus() {
// User returned to the text field... reset stash rate to default
idleTimeout = 3000;
}
$text.on( {
keyup: onKeyUp,
focus: onTextFocus,
change: checkStash
} );
$summary.on( {
keyup: onKeyUp,
focus: onSummaryFocus,
focusout: checkStash
} );
if (
// Reverts may involve use (undo) links; stash as they review the diff.
// Since the form has a pre-filled summary, stash the edit immediately.
mw.util.getParamValue( 'undo' ) !== null ||
// Pressing "show changes" and "preview" also signify that the user will
// probably save the page soon
[ 'preview', 'diff' ].includes( $form.find( '#mw-edit-mode' ).val() )
) {
checkStash();
}
} );