slice-ansi-string

Slice a string included ANSI escape codes

In some use cases slice-ansi did not work properly. This is what I reworked with reference to slice-ansi.

Installation

npm install slice-ansi-string

Usage

Basic usage

const sliceAnsiString = require('slice-ansi-string');
 
const str = 'A\u001b[31mBC\u001b[39mD';  // Meaning like "A<red>BC</red>D"
 
console.log(sliceAnsiString(str, 0, 1));  // -> "A"
console.log(sliceAnsiString(str, 0, 2));  // -> "A\u001b[31mB\u001b[39m", meaning like "A<red>B</red>"
console.log(sliceAnsiString(str, 2, 3));  // -> "\u001b[31mC\u001b[39m", meaning like "<red>C</red>"

Nested ANSI escape codes

const sliceAnsiString = require('slice-ansi-string');
 
const str = 'A\u001b[31mB\u001b[4mCD\u001b[24m\u001b[39mE';  // Meaning like "A<red>B<underline>CD</underline></red>E"
 
console.log(sliceAnsiString(str, 1, 3));  // -> "\u001b[31mB\u001b[4mC\u001b[24m\u001b[39m", meaning like "<red>B<underline>C</underline></red>"

API

sliceAnsiString(str, beginSlice, [endSlice])

Arguments

• str: string
• beginSlice: number
  • A zero-based index of where to begin the slice.
  • Only 0 or more.
• endSlice: (string|null|undefined)
  • A zero-based index of where to end the slice.
  • Only 0 or more.
  • The default is until the end.

Supplements

• Multibyte characters and surrogate pairs are counted as one character.
• It may not be possible to correspond to the character string output by chalk.
  • For example, chalk.dim.bold('A') outputs "\u001b[2m\u001b[1mA\u001b[2m\u001b[22m", but this library expects "\u001b[2m\u001b[1mA\u001b[22m\u001b[22m".
  • However, chalk.bold.underline.red('A') returns expected outputs, so it may be a specific problem of dim.bold.