@atlaskit/editor-plugin-code-block-advanced
Version:
CodeBlockAdvanced plugin for @atlaskit/editor-core
62 lines (60 loc) • 2.28 kB
JavaScript
import { expValEquals } from '@atlaskit/tmp-editor-statsig/exp-val-equals';
/**
*
* Compares the updated text with the current to determine the transaction to fire
* in the CodeMirror editor.
*
* @param curText string - the current CodeMirror text
* @param newText string - the new ProseMirror text
* @returns The changes or undefined if no change
*/
const N_LINE_FEED = '\n'.charCodeAt(0);
const R_LINE_FEED = '\r'.charCodeAt(0);
/**
* Example of CRLF differences:
* newText: 'abc\r\ndef\r\nghi'
* curText: 'abc\ndef\nghi'
*/
export const getCMSelectionChanges = (curText, newText) => {
if (newText !== curText) {
let curStart = 0,
newStart = 0;
let start = 0,
curEnd = curText.length,
newEnd = newText.length;
if (expValEquals('platform_editor_fix_advanced_codeblocks_crlf_patch', 'isEnabled', true)) {
while (curStart < curEnd && (curText.charCodeAt(curStart) === newText.charCodeAt(newStart) || newText.charCodeAt(newStart) === R_LINE_FEED && curText.charCodeAt(curStart) === N_LINE_FEED)) {
if (newText.charCodeAt(newStart) === R_LINE_FEED && curText.charCodeAt(curStart) === N_LINE_FEED && newText.charCodeAt(newStart + 1) === N_LINE_FEED) {
newStart++;
}
curStart++;
newStart++;
}
while (curEnd > curStart && newEnd > newStart && (curText.charCodeAt(curEnd - 1) === newText.charCodeAt(newEnd - 1) || newText.charCodeAt(newEnd - 1) === N_LINE_FEED && curText.charCodeAt(curEnd - 1) === N_LINE_FEED)) {
if (newText.charCodeAt(newEnd - 1) === N_LINE_FEED && curText.charCodeAt(curEnd - 1) === N_LINE_FEED && newText.charCodeAt(newEnd - 2) === R_LINE_FEED) {
newEnd--;
}
curEnd--;
newEnd--;
}
return {
from: curStart,
to: curEnd,
insert: newText.slice(newStart, newEnd)
};
} else {
while (start < curEnd && curText.charCodeAt(start) === newText.charCodeAt(start)) {
++start;
}
while (curEnd > start && newEnd > start && curText.charCodeAt(curEnd - 1) === newText.charCodeAt(newEnd - 1)) {
curEnd--;
newEnd--;
}
return {
from: start,
to: curEnd,
insert: newText.slice(start, newEnd)
};
}
}
};