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Code Issues Releases Wiki Activity

Reduced indexOf calls in wiki.sortByList (#4275) (#4397)

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Examined the tests in test-tag. They already cover all the use cases
I could think of.
This commit is contained in:
Cameron Fischer 2020-04-14 12:49:10 -04:00 committed by GitHub
parent 69c8058b72
commit 43fdb553b7
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1 changed files with 27 additions and 14 deletions
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41
core/modules/wiki.js
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@ -580,7 +580,9 @@ Sorts an array of tiddler titles according to an ordered list
exports.sortByList = function(array,listTitle) {
var self = this,
replacedTitles = Object.create(null);
function replaceItem(title) {
// Given a title, this function will place it in the correct location
// within titles.
function moveItemInList(title) {
if(!$tw.utils.hop(replacedTitles, title)) {
replacedTitles[title] = true;
var newPos = -1,
@ -593,26 +595,37 @@ exports.sortByList = function(array,listTitle) {
} else if(afterTitle === "") {
newPos = titles.length;
} else if(beforeTitle) {
replaceItem(beforeTitle);
// if this title is placed relative
// to another title, make sure that
// title is placed before we place
// this one.
moveItemInList(beforeTitle);
newPos = titles.indexOf(beforeTitle);
} else if(afterTitle) {
replaceItem(afterTitle);
// Same deal
moveItemInList(afterTitle);
newPos = titles.indexOf(afterTitle);
if(newPos >= 0) {
++newPos;
}
}
// We get the currPos //after// figuring out the newPos, because recursive replaceItem calls might alter title's currPos
var currPos = titles.indexOf(title);
if(newPos === -1) {
newPos = currPos;
}
if(currPos >= 0 && newPos !== currPos) {
titles.splice(currPos,1);
if(newPos >= currPos) {
newPos--;
// If a new position is specified, let's move it
if (newPos !== -1) {
// get its current Pos, and make sure
// sure that it's _actually_ in the list
// and that it would _actually_ move
// (#4275) We don't bother calling
// indexOf unless we have a new
// position to work with
var currPos = titles.indexOf(title);
if(currPos >= 0 && newPos !== currPos) {
// move it!
titles.splice(currPos,1);
if(newPos >= currPos) {
newPos--;
}
titles.splice(newPos,0,title);
}
titles.splice(newPos,0,title);
}
}
}
@ -640,7 +653,7 @@ exports.sortByList = function(array,listTitle) {
var sortedTitles = titles.slice(0);
for(t=0; t<sortedTitles.length; t++) {
title = sortedTitles[t];
replaceItem(title);
moveItemInList(title);
}
return titles;
}