export function getTextPositionMessage(text: string, index: number) {

if (!isFinite(index)) {

throw new Error(`Wrong char index ${index}`);

}

let message = '';

let line = 0;

let prevLn: number;

let nextLn = 0;

do {

line++;

prevLn = nextLn;

nextLn = text.indexOf('\n', prevLn + 1);

} while (nextLn >= 0 && nextLn <= index);

const column = index - prevLn;

message += `line ${line}, column ${column}`;

message += '\n';

if (index < text.length) {

message += text.substring(prevLn + 1, nextLn);

} else {

message += text.substring(text.lastIndexOf('\n') + 1);

}

message += '\n';

message += `${new Array(column).join('-')}^`;

return message;

}

export function getTextDiffIndex(a: string, b: string) {

const short = Math.min(a.length, b.length);

for (let i = 0; i < short; i++) {

if (a[i] !== b[i]) {

return i;

}

}

if (a.length !== b.length) {

return short;

}

return -1;

}

export function parseArray(text: string) {

return text.replace(/\r/g, '')

.split('\n')

.map((s) => s.trim())

.filter((s) => s);

}

export function formatArray(arr: string[]) {

return arr.concat('').join('\n');

}

export function getMatches(regex: RegExp, input: string, group = 0) {

const matches: string[] = [];

let m: RegExpMatchArray;

while (m = regex.exec(input)) {

matches.push(m[group]);

}

return matches;

}

export function getStringSize(value: string) {

return value.length * 2;

}