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styleSelectedText.ts
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styleSelectedText.ts
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/*
* Original Copyright GitHub, Inc. Licensed under the MIT License.
* See license text at https://github.com/github/markdown-toolbar-element/blob/master/LICENSE.
*/
import insertText, { SelectionRange } from './insertText';
interface StyleArgs {
prefix: string;
suffix: string;
blockPrefix: string;
blockSuffix: string;
multiline: boolean;
replaceNext: string;
prefixSpace: boolean;
scanFor: string;
surroundWithNewlines: boolean;
orderedList: boolean;
unorderedList: boolean;
trimFirst: boolean;
}
const defaults: StyleArgs = {
prefix: '',
suffix: '',
blockPrefix: '',
blockSuffix: '',
multiline: false,
replaceNext: '',
prefixSpace: false,
scanFor: '',
surroundWithNewlines: false,
orderedList: false,
unorderedList: false,
trimFirst: false,
};
export default function styleSelectedText(textarea: HTMLTextAreaElement, styleArgs: StyleArgs) {
// Next 2 lines are added
textarea.focus();
styleArgs = Object.assign({}, defaults, styleArgs);
// Prev 2 lines are added
const text = textarea.value.slice(textarea.selectionStart, textarea.selectionEnd);
let result;
if (styleArgs.orderedList || styleArgs.unorderedList) {
result = listStyle(textarea, styleArgs);
} else if (styleArgs.multiline && isMultipleLines(text)) {
result = multilineStyle(textarea, styleArgs);
} else {
result = blockStyle(textarea, styleArgs);
}
insertText(textarea, result);
}
function isMultipleLines(string: string): boolean {
return string.trim().split('\n').length > 1;
}
function repeat(string: string, n: number): string {
return Array(n + 1).join(string);
}
function wordSelectionStart(text: string, i: number): number {
let index = i;
while (text[index] && text[index - 1] != null && !text[index - 1].match(/\s/)) {
index--;
}
return index;
}
function wordSelectionEnd(text: string, i: number, multiline: boolean): number {
let index = i;
const breakpoint = multiline ? /\n/ : /\s/;
while (text[index] && !text[index].match(breakpoint)) {
index++;
}
return index;
}
function expandSelectionToLine(textarea: HTMLTextAreaElement) {
const lines = textarea.value.split('\n');
let counter = 0;
for (let index = 0; index < lines.length; index++) {
const lineLength = lines[index].length + 1;
if (textarea.selectionStart >= counter && textarea.selectionStart < counter + lineLength) {
textarea.selectionStart = counter;
}
if (textarea.selectionEnd >= counter && textarea.selectionEnd < counter + lineLength) {
textarea.selectionEnd = counter + lineLength - 1;
}
counter += lineLength;
}
}
function expandSelectedText(textarea: HTMLTextAreaElement, prefixToUse: string, suffixToUse: string, multiline = false): string {
if (textarea.selectionStart === textarea.selectionEnd) {
textarea.selectionStart = wordSelectionStart(textarea.value, textarea.selectionStart);
textarea.selectionEnd = wordSelectionEnd(textarea.value, textarea.selectionEnd, multiline);
} else {
const expandedSelectionStart = textarea.selectionStart - prefixToUse.length;
const expandedSelectionEnd = textarea.selectionEnd + suffixToUse.length;
const beginsWithPrefix = textarea.value.slice(expandedSelectionStart, textarea.selectionStart) === prefixToUse;
const endsWithSuffix = textarea.value.slice(textarea.selectionEnd, expandedSelectionEnd) === suffixToUse;
if (beginsWithPrefix && endsWithSuffix) {
textarea.selectionStart = expandedSelectionStart;
textarea.selectionEnd = expandedSelectionEnd;
}
}
return textarea.value.slice(textarea.selectionStart, textarea.selectionEnd);
}
interface Newlines {
newlinesToAppend: string;
newlinesToPrepend: string;
}
function newlinesToSurroundSelectedText(textarea: HTMLTextAreaElement): Newlines {
const beforeSelection = textarea.value.slice(0, textarea.selectionStart);
const afterSelection = textarea.value.slice(textarea.selectionEnd);
const breaksBefore = beforeSelection.match(/\n*$/);
const breaksAfter = afterSelection.match(/^\n*/);
const newlinesBeforeSelection = breaksBefore ? breaksBefore[0].length : 0;
const newlinesAfterSelection = breaksAfter ? breaksAfter[0].length : 0;
let newlinesToAppend;
let newlinesToPrepend;
if (beforeSelection.match(/\S/) && newlinesBeforeSelection < 2) {
newlinesToAppend = repeat('\n', 2 - newlinesBeforeSelection);
}
if (afterSelection.match(/\S/) && newlinesAfterSelection < 2) {
newlinesToPrepend = repeat('\n', 2 - newlinesAfterSelection);
}
if (newlinesToAppend == null) {
newlinesToAppend = '';
}
if (newlinesToPrepend == null) {
newlinesToPrepend = '';
}
return { newlinesToAppend, newlinesToPrepend };
}
function blockStyle(textarea: HTMLTextAreaElement, arg: StyleArgs): SelectionRange {
let newlinesToAppend;
let newlinesToPrepend;
const { prefix, suffix, blockPrefix, blockSuffix, replaceNext, prefixSpace, scanFor, surroundWithNewlines } = arg;
const originalSelectionStart = textarea.selectionStart;
const originalSelectionEnd = textarea.selectionEnd;
let selectedText = textarea.value.slice(textarea.selectionStart, textarea.selectionEnd);
let prefixToUse = isMultipleLines(selectedText) && blockPrefix.length > 0 ? `${blockPrefix}\n` : prefix;
// CHANGED
let suffixToUse = isMultipleLines(selectedText) && blockSuffix.length > 0 ? `\n${blockSuffix}` : prefixToUse === prefix ? suffix : '';
// END CHANGED
if (prefixSpace) {
const beforeSelection = textarea.value[textarea.selectionStart - 1];
if (textarea.selectionStart !== 0 && beforeSelection != null && !beforeSelection.match(/\s/)) {
prefixToUse = ` ${prefixToUse}`;
}
}
selectedText = expandSelectedText(textarea, prefixToUse, suffixToUse, arg.multiline);
let selectionStart = textarea.selectionStart;
let selectionEnd = textarea.selectionEnd;
const hasReplaceNext = replaceNext.length > 0 && suffixToUse.indexOf(replaceNext) > -1 && selectedText.length > 0;
if (surroundWithNewlines) {
const ref = newlinesToSurroundSelectedText(textarea);
newlinesToAppend = ref.newlinesToAppend;
newlinesToPrepend = ref.newlinesToPrepend;
prefixToUse = newlinesToAppend + prefix;
suffixToUse += newlinesToPrepend;
}
if (selectedText.startsWith(prefixToUse) && selectedText.endsWith(suffixToUse)) {
const replacementText = selectedText.slice(prefixToUse.length, selectedText.length - suffixToUse.length);
if (originalSelectionStart === originalSelectionEnd) {
let position = originalSelectionStart - prefixToUse.length;
position = Math.max(position, selectionStart);
position = Math.min(position, selectionStart + replacementText.length);
selectionStart = selectionEnd = position;
} else {
selectionEnd = selectionStart + replacementText.length;
}
return { text: replacementText, selectionStart, selectionEnd };
} else if (!hasReplaceNext) {
let replacementText = prefixToUse + selectedText + suffixToUse;
selectionStart = originalSelectionStart + prefixToUse.length;
selectionEnd = originalSelectionEnd + prefixToUse.length;
const whitespaceEdges = selectedText.match(/^\s*|\s*$/g);
if (arg.trimFirst && whitespaceEdges) {
const leadingWhitespace = whitespaceEdges[0] || '';
const trailingWhitespace = whitespaceEdges[1] || '';
replacementText = leadingWhitespace + prefixToUse + selectedText.trim() + suffixToUse + trailingWhitespace;
selectionStart += leadingWhitespace.length;
selectionEnd -= trailingWhitespace.length;
}
return { text: replacementText, selectionStart, selectionEnd };
} else if (scanFor.length > 0 && selectedText.match(scanFor)) {
suffixToUse = suffixToUse.replace(replaceNext, selectedText);
const replacementText = prefixToUse + suffixToUse;
selectionStart = selectionEnd = selectionStart + prefixToUse.length;
return { text: replacementText, selectionStart, selectionEnd };
} else {
const replacementText = prefixToUse + selectedText + suffixToUse;
selectionStart = selectionStart + prefixToUse.length + selectedText.length + suffixToUse.indexOf(replaceNext);
selectionEnd = selectionStart + replaceNext.length;
return { text: replacementText, selectionStart, selectionEnd };
}
}
function multilineStyle(textarea: HTMLTextAreaElement, arg: StyleArgs) {
const { prefix, suffix, blockPrefix, blockSuffix, surroundWithNewlines } = arg;
let text = textarea.value.slice(textarea.selectionStart, textarea.selectionEnd);
let selectionStart = textarea.selectionStart;
let selectionEnd = textarea.selectionEnd;
const lines = text.split('\n');
// CHANGED
let prefixToUse = blockPrefix.length > 0 ? blockPrefix : prefix;
let suffixToUse = blockSuffix.length > 0 ? blockSuffix : prefixToUse == prefix ? suffix : '';
const undoStyle = lines.every((line) => line.startsWith(prefixToUse) && line.endsWith(suffixToUse));
// END CHANGED
if (undoStyle) {
text = lines.map((line) => line.slice(prefixToUse.length, line.length - suffixToUse.length)).join('\n');
selectionEnd = selectionStart + text.length;
} else {
// CHANGED
text = lines.map((line) => prefixToUse + line + suffixToUse).join('\n');
if (surroundWithNewlines || suffixToUse === '') {
// END CHANGED
const { newlinesToAppend, newlinesToPrepend } = newlinesToSurroundSelectedText(textarea);
selectionStart += newlinesToAppend.length;
selectionEnd = selectionStart + text.length;
text = newlinesToAppend + text + newlinesToPrepend;
}
}
return { text, selectionStart, selectionEnd };
}
interface UndoResult {
text: string;
processed: boolean;
}
function undoOrderedListStyle(text: string): UndoResult {
const lines = text.split('\n');
const orderedListRegex = /^\d+\.\s+/;
const shouldUndoOrderedList = lines.every((line) => orderedListRegex.test(line));
let result = lines;
if (shouldUndoOrderedList) {
result = lines.map((line) => line.replace(orderedListRegex, ''));
}
return {
text: result.join('\n'),
processed: shouldUndoOrderedList,
};
}
function undoUnorderedListStyle(text: string): UndoResult {
const lines = text.split('\n');
const unorderedListPrefix = '- ';
const shouldUndoUnorderedList = lines.every((line) => line.startsWith(unorderedListPrefix));
let result = lines;
if (shouldUndoUnorderedList) {
result = lines.map((line) => line.slice(unorderedListPrefix.length, line.length));
}
return {
text: result.join('\n'),
processed: shouldUndoUnorderedList,
};
}
function makePrefix(index: number, unorderedList: boolean): string {
if (unorderedList) {
return '- ';
} else {
return `${index + 1}. `;
}
}
function clearExistingListStyle(style: StyleArgs, selectedText: string): [UndoResult, UndoResult, string] {
let undoResultOpositeList: UndoResult;
let undoResult: UndoResult;
let pristineText;
if (style.orderedList) {
undoResult = undoOrderedListStyle(selectedText);
undoResultOpositeList = undoUnorderedListStyle(undoResult.text);
pristineText = undoResultOpositeList.text;
} else {
undoResult = undoUnorderedListStyle(selectedText);
undoResultOpositeList = undoOrderedListStyle(undoResult.text);
pristineText = undoResultOpositeList.text;
}
return [undoResult, undoResultOpositeList, pristineText];
}
function listStyle(textarea: HTMLTextAreaElement, style: StyleArgs): SelectionRange {
const noInitialSelection = textarea.selectionStart === textarea.selectionEnd;
let selectionStart = textarea.selectionStart;
let selectionEnd = textarea.selectionEnd;
// Select whole line
expandSelectionToLine(textarea);
const selectedText = textarea.value.slice(textarea.selectionStart, textarea.selectionEnd);
// If the user intent was to do an undo, we will stop after this.
// Otherwise, we will still undo to other list type to prevent list stacking
const [undoResult, undoResultOpositeList, pristineText] = clearExistingListStyle(style, selectedText);
const prefixedLines = pristineText.split('\n').map((value, index) => {
return `${makePrefix(index, style.unorderedList)}${value}`;
});
const totalPrefixLength = prefixedLines.reduce((previousValue, _currentValue, currentIndex) => {
return previousValue + makePrefix(currentIndex, style.unorderedList).length;
}, 0);
const totalPrefixLengthOpositeList = prefixedLines.reduce((previousValue, _currentValue, currentIndex) => {
return previousValue + makePrefix(currentIndex, !style.unorderedList).length;
}, 0);
if (undoResult.processed) {
if (noInitialSelection) {
selectionStart = Math.max(selectionStart - makePrefix(0, style.unorderedList).length, 0);
selectionEnd = selectionStart;
} else {
selectionStart = textarea.selectionStart;
selectionEnd = textarea.selectionEnd - totalPrefixLength;
}
return { text: pristineText, selectionStart, selectionEnd };
}
const { newlinesToAppend, newlinesToPrepend } = newlinesToSurroundSelectedText(textarea);
const text = newlinesToAppend + prefixedLines.join('\n') + newlinesToPrepend;
if (noInitialSelection) {
selectionStart = Math.max(selectionStart + makePrefix(0, style.unorderedList).length + newlinesToAppend.length, 0);
selectionEnd = selectionStart;
} else {
if (undoResultOpositeList.processed) {
selectionStart = Math.max(textarea.selectionStart + newlinesToAppend.length, 0);
selectionEnd = textarea.selectionEnd + newlinesToAppend.length + totalPrefixLength - totalPrefixLengthOpositeList;
} else {
selectionStart = Math.max(textarea.selectionStart + newlinesToAppend.length, 0);
selectionEnd = textarea.selectionEnd + newlinesToAppend.length + totalPrefixLength;
}
}
return { text, selectionStart, selectionEnd };
}