Swap-Aggregator-Subgraph/node_modules/yaml/browser/dist/cst/source-utils.js

function findLineStarts(src) {
  var ls = [0];
  var offset = src.indexOf('\n');

  while (offset !== -1) {
    offset += 1;
    ls.push(offset);
    offset = src.indexOf('\n', offset);
  }

  return ls;
}

function getSrcInfo(cst) {
  var lineStarts, src;

  if (typeof cst === 'string') {
    lineStarts = findLineStarts(cst);
    src = cst;
  } else {
    if (Array.isArray(cst)) cst = cst[0];

    if (cst && cst.context) {
      if (!cst.lineStarts) cst.lineStarts = findLineStarts(cst.context.src);
      lineStarts = cst.lineStarts;
      src = cst.context.src;
    }
  }

  return {
    lineStarts: lineStarts,
    src: src
  };
}
/**
 * @typedef {Object} LinePos - One-indexed position in the source
 * @property {number} line
 * @property {number} col
 */

/**
 * Determine the line/col position matching a character offset.
 *
 * Accepts a source string or a CST document as the second parameter. With
 * the latter, starting indices for lines are cached in the document as
 * `lineStarts: number[]`.
 *
 * Returns a one-indexed `{ line, col }` location if found, or
 * `undefined` otherwise.
 *
 * @param {number} offset
 * @param {string|Document|Document[]} cst
 * @returns {?LinePos}
 */


export function getLinePos(offset, cst) {
  if (typeof offset !== 'number' || offset < 0) return null;

  var _getSrcInfo = getSrcInfo(cst),
      lineStarts = _getSrcInfo.lineStarts,
      src = _getSrcInfo.src;

  if (!lineStarts || !src || offset > src.length) return null;

  for (var i = 0; i < lineStarts.length; ++i) {
    var start = lineStarts[i];

    if (offset < start) {
      return {
        line: i,
        col: offset - lineStarts[i - 1] + 1
      };
    }

    if (offset === start) return {
      line: i + 1,
      col: 1
    };
  }

  var line = lineStarts.length;
  return {
    line: line,
    col: offset - lineStarts[line - 1] + 1
  };
}
/**
 * Get a specified line from the source.
 *
 * Accepts a source string or a CST document as the second parameter. With
 * the latter, starting indices for lines are cached in the document as
 * `lineStarts: number[]`.
 *
 * Returns the line as a string if found, or `null` otherwise.
 *
 * @param {number} line One-indexed line number
 * @param {string|Document|Document[]} cst
 * @returns {?string}
 */

export function getLine(line, cst) {
  var _getSrcInfo2 = getSrcInfo(cst),
      lineStarts = _getSrcInfo2.lineStarts,
      src = _getSrcInfo2.src;

  if (!lineStarts || !(line >= 1) || line > lineStarts.length) return null;
  var start = lineStarts[line - 1];
  var end = lineStarts[line]; // undefined for last line; that's ok for slice()

  while (end && end > start && src[end - 1] === '\n') {
    --end;
  }

  return src.slice(start, end);
}
/**
 * Pretty-print the starting line from the source indicated by the range `pos`
 *
 * Trims output to `maxWidth` chars while keeping the starting column visible,
 * using `…` at either end to indicate dropped characters.
 *
 * Returns a two-line string (or `null`) with `\n` as separator; the second line
 * will hold appropriately indented `^` marks indicating the column range.
 *
 * @param {Object} pos
 * @param {LinePos} pos.start
 * @param {LinePos} [pos.end]
 * @param {string|Document|Document[]*} cst
 * @param {number} [maxWidth=80]
 * @returns {?string}
 */

export function getPrettyContext(_ref, cst) {
  var start = _ref.start,
      end = _ref.end;
  var maxWidth = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : 80;
  var src = getLine(start.line, cst);
  if (!src) return null;
  var col = start.col;

  if (src.length > maxWidth) {
    if (col <= maxWidth - 10) {
      src = src.substr(0, maxWidth - 1) + '…';
    } else {
      var halfWidth = Math.round(maxWidth / 2);
      if (src.length > col + halfWidth) src = src.substr(0, col + halfWidth - 1) + '…';
      col -= src.length - maxWidth;
      src = '…' + src.substr(1 - maxWidth);
    }
  }

  var errLen = 1;
  var errEnd = '';

  if (end) {
    if (end.line === start.line && col + (end.col - start.col) <= maxWidth + 1) {
      errLen = end.col - start.col;
    } else {
      errLen = Math.min(src.length + 1, maxWidth) - col;
      errEnd = '…';
    }
  }

  var offset = col > 1 ? ' '.repeat(col - 1) : '';
  var err = '^'.repeat(errLen);
  return "".concat(src, "\n").concat(offset).concat(err).concat(errEnd);
}