find-matching-bracket

find-matching-bracket

Find matching bracket in Js/Ts/Cs code (including string Template literals interpolation)

/**
 * if throwErrors is true, it throw (stop) with info.
 * else it return matching position,
 * or:
 * -2 if startPostion don't match start bracket
 * -3 if end bracket dont match start bracket
 * -1 if cursor comes to end of code without finding maching bracket
 *
 * @param code
 * @param startPosition position for staing bracket
 * @param throwErrors default false - if true: throw error with information
 * @returns
 */
export default function matchBracket(code: string, startPosition: number, throwErrors = false): number;

matchBracket example:

const code = "{ }";
const endPosition = matchBracket(code, 0);
// endPosition = 2

Complex ex:

const code =
  "function foo(s: string) {\n" + // <- start pos 24
  "   var str = `text with repeat ${new Array(2).fill(s).map(s=>{ return s + '-{}-' }).join('')} ends here `;\n" +
  "    return { return: str }\n" +
  "}"; // <- return this position 160 (What we need to find!)

const endPosition = matchBracket(code, 24);

// endPosition = 160
const includeBoth = code.substring(24, 161); // 160+1 to include the end bracket
const excludeBoth = code.substring(25, 160); // 24+1 to exclude start bracket

Bracket that can be matchs:

${ and $" can only be matched inside string templates (js an cs templates)

Matching bracket:

name	start	end	node
lineComment	//	\n
multilineComment	/*	*/
angle	<	>
peparentheses	(	)
square	[	]
curly	{	}
double	"	"
single	'	'
jsTemplate	`	`
cSharpTemplate	$"	"
escapeJsTemaple	${	}	only in jsTemplate
inCSharpTemaple	{	}	only in cSharpTemplate