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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 | 1x 1x 1x 7x 7x 7x 7x 1x 7x 2x 2x 208x 2x 2x 208x 208x 2x 1x 1x 2x 2x 4x 4x 7x 72x 4x 1x 1x 4x 4x 4x 72x 64x 64x 64x 72x 72x 72x 7x 1x 45x 45x 1x 4x 4x | import { splitWords } from './split-words.ts';
import { empty, space } from './unicode.ts';
/**
* Options for the {@link wordwrap} function
* @group String
* @category Operations
*/
export type WordwrapOptions = {
/** The width to wrap to */
width?: number;
/** Line separator */
separator?: string;
/** If true, don't limit breaks to word boundaries */
cut?: boolean;
/** If true, spaces are added to the end of each line to make all lines equal width, ignored if cut or preserveSpaces is true */
trailingSpaces?: boolean;
};
/**
* Wrap text so that it fits within a area of fixed width
* @param input - the text to wrap
* @param options - see {@link WordwrapOptions}
* @defaultValue width 75
* @defaultValue separator \\n
* @defaultValue cut default false
* @defaultValue trailingSpaces false
* @returns wrapped text
* @group String
* @category Operations
*/
export function wordwrap(
input: string,
{ width = 75, separator = '\n', cut = false, trailingSpaces = false }: WordwrapOptions = {},
): string {
if (width <= 0) {
return input;
} else if (cut) {
let result = empty;
// walk through each character and add separators where appropriate
for (let i = 0; i < input.length; ++i) {
if (i % width === 0 && i > 0) {
result += separator;
}
result += input.charAt(i);
}
// fill the rest of the line with spaces if trailingSpaces option is true
if (trailingSpaces) {
result += space.repeat(width - (input.length % width));
}
return result;
}
let currentColumn = 0;
let result = empty;
for (const word of splitWords(input)) {
// if adding a space and the next word would cause this line to be longer than width...
if (word.length + currentColumn > width) {
if (trailingSpaces) {
// fill the rest of the line with spaces if trailingSpaces option is true
result += space.repeat(width - currentColumn);
}
//start new line
result += separator;
currentColumn = 0;
}
// if not at the beginning of the line, add a space in front of the word
if (currentColumn > 0) {
result += space;
currentColumn++;
}
// tack on the next word, update current column, a pop words array
result += word;
currentColumn += word.length;
}
// fill the rest of the line with spaces if trailingSpaces option is true
if (trailingSpaces) {
while (currentColumn++ < width) {
result += space;
}
}
return result;
}
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