sucrase/dist/sucrase-babylon/util/location.js

Super-fast alternative to Babel for when you can target modern JS runtimes

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.getLineInfo = getLineInfo;
exports.SourceLocation = exports.Position = void 0;

var _whitespace = require("./whitespace");

// These are used when `options.locations` is on, for the
// `startLoc` and `endLoc` properties.
class Position {
  constructor(line, col) {
    this.line = line;
    this.column = col;
  }

}

exports.Position = Position;

class SourceLocation {
  constructor(start, end) {
    this.start = start; // $FlowIgnore (may start as null, but initialized later)

    this.end = end;
  }

} // The `getLineInfo` function is mostly useful when the
// `locations` option is off (for performance reasons) and you
// want to find the line/column position for a given character
// offset. `input` should be the code string that the offset refers
// into.


exports.SourceLocation = SourceLocation;

function getLineInfo(input, offset) {
  for (let line = 1, cur = 0;;) {
    _whitespace.lineBreakG.lastIndex = cur;

    const match = _whitespace.lineBreakG.exec(input);

    if (match && match.index < offset) {
      ++line;
      cur = match.index + match[0].length;
    } else {
      return new Position(line, offset - cur);
    }
  } // istanbul ignore next


  throw new Error("Unreachable");
}