/
findListItemsInSameThread.ts
153 lines (127 loc) · 4.43 KB
/
findListItemsInSameThread.ts
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import type { ContentModelBlockGroup, ContentModelListItem } from 'roosterjs-content-model-types';
/**
* @param model The content model
* @param currentItem The current list item
* Search for all list items in the same thread as the current list item
*/
export function findListItemsInSameThread(
group: ContentModelBlockGroup,
currentItem: ContentModelListItem
): ContentModelListItem[] {
const items: (ContentModelListItem | null)[] = [];
findListItems(group, items);
return filterListItems(items, currentItem);
}
function findListItems(group: ContentModelBlockGroup, result: (ContentModelListItem | null)[]) {
group.blocks.forEach(block => {
switch (block.blockType) {
case 'BlockGroup':
if (block.blockGroupType == 'ListItem') {
result.push(block);
} else {
pushNullIfNecessary(result);
findListItems(block, result);
pushNullIfNecessary(result);
}
break;
case 'Paragraph':
pushNullIfNecessary(result);
block.segments.forEach(segment => {
if (segment.segmentType == 'General') {
findListItems(segment, result);
}
});
pushNullIfNecessary(result);
break;
case 'Table':
pushNullIfNecessary(result);
block.rows.forEach(row =>
row.cells.forEach(cell => {
findListItems(cell, result);
})
);
pushNullIfNecessary(result);
break;
}
});
}
function pushNullIfNecessary(result: (ContentModelListItem | null)[]) {
const last = result[result.length - 1];
if (!last || last !== null) {
result.push(null);
}
}
function filterListItems(
items: (ContentModelListItem | null)[],
currentItem: ContentModelListItem
) {
const result: ContentModelListItem[] = [];
const currentIndex = items.indexOf(currentItem);
const levelLength = currentItem.levels.length;
const isOrderedList = currentItem.levels[levelLength - 1]?.listType == 'OL';
if (currentIndex >= 0) {
for (let i = currentIndex; i >= 0; i--) {
const item = items[i];
if (!item) {
if (isOrderedList) {
continue;
} else {
break;
}
}
const startNumberOverride = hasStartNumberOverride(item, levelLength);
if (areListTypesCompatible(items, currentIndex, i)) {
result.unshift(item);
if (isOrderedList && startNumberOverride) {
break;
}
} else if (
!isOrderedList ||
startNumberOverride ||
item.levels.length < currentItem.levels.length
) {
break;
}
}
for (let i = currentIndex + 1; i < items.length; i++) {
const item = items[i];
if (!item) {
if (isOrderedList) {
continue;
} else {
break;
}
}
const startNumberOverride = hasStartNumberOverride(item, levelLength);
if (areListTypesCompatible(items, currentIndex, i) && !startNumberOverride) {
result.push(item);
} else if (
!isOrderedList ||
startNumberOverride ||
item.levels.length < currentItem.levels.length
) {
break;
}
}
}
return result;
}
function areListTypesCompatible(
listItems: (ContentModelListItem | null)[],
currentIndex: number,
compareToIndex: number
): boolean {
const currentLevels = listItems[currentIndex]!.levels;
const compareToLevels = listItems[compareToIndex]!.levels;
return (
currentLevels.length <= compareToLevels.length &&
currentLevels.every(
(currentLevel, i) => currentLevel.listType == compareToLevels[i].listType
)
);
}
function hasStartNumberOverride(item: ContentModelListItem, levelLength: number): boolean {
return item.levels
.slice(0, levelLength)
.some(level => level.format.startNumberOverride !== undefined);
}