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import { COLON, HYPHEN, NEWLINE } from '~/lib/utils/text_utility';
/**
* Get the index from sourcepos that represents the line of
* the description when the description is split by newline.
*
* @param {String} sourcepos Source position in format `23:3-23:14`
* @returns {Number} Index of description split by newline
*/
const getDescriptionIndex = (sourcepos) => {
const [startRange] = sourcepos.split(HYPHEN);
const [startRow] = startRange.split(COLON);
return startRow - 1;
};
/**
* Given a `ul` or `ol` element containing a new sort order, this function performs
* a depth-first search to get the new sort order in the form of sourcepos indices.
*
* @param {HTMLElement} list A `ul` or `ol` element containing a new sort order
* @returns {Array<Number>} An array representing the new order of the list
*/
const getNewSourcePositions = (list) => {
const newSourcePositions = [];
function pushPositionOfChildListItems(el) {
if (!el) {
return;
}
if (el.tagName === 'LI') {
newSourcePositions.push(getDescriptionIndex(el.dataset.sourcepos));
}
Array.from(el.children).forEach(pushPositionOfChildListItems);
}
pushPositionOfChildListItems(list);
return newSourcePositions;
};
/**
* Converts a description to one with a new list sort order.
*
* Given a description like:
*
* <pre>
* 1. I am text
* 2.
* 3. - Item 1
* 4. - Item 2
* 5. - Item 3
* 6. - Item 4
* 7. - Item 5
* </pre>
*
* And a reordered list (due to dragging Item 2 into Item 1's position) like:
*
* <pre>
* <ul data-sourcepos="3:1-8:0">
* <li data-sourcepos="4:1-4:8">
* Item 2
* <ul data-sourcepos="5:1-6:10">
* <li data-sourcepos="5:1-5:10">Item 3</li>
* <li data-sourcepos="6:1-6:10">Item 4</li>
* </ul>
* </li>
* <li data-sourcepos="3:1-3:8">Item 1</li>
* <li data-sourcepos="7:1-8:0">Item 5</li>
* <ul>
* </pre>
*
* This function returns:
*
* <pre>
* 1. I am text
* 2.
* 3. - Item 2
* 4. - Item 3
* 5. - Item 4
* 6. - Item 1
* 7. - Item 5
* </pre>
*
* @param {String} description Description in markdown format
* @param {HTMLElement} list A `ul` or `ol` element containing a new sort order
* @returns {String} Markdown with a new list sort order
*/
export const convertDescriptionWithNewSort = (description, list) => {
const descriptionLines = description.split(NEWLINE);
const startIndexOfList = getDescriptionIndex(list.dataset.sourcepos);
getNewSourcePositions(list)
.map((lineIndex) => descriptionLines[lineIndex])
.forEach((line, index) => {
descriptionLines[startIndexOfList + index] = line;
});
return descriptionLines.join(NEWLINE);
};
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