import {lineBreakG} from “./whitespace”

// These are used when `options.locations` is on, for the // `startLoc` and `endLoc` properties.

export class Position {

constructor(line, col) {
  this.line = line
  this.column = col
}

offset(n) {
  return new Position(this.line, this.column + n)
}

}

export class SourceLocation {

constructor(p, start, end) {
  this.start = start
  this.end = end
  if (p.sourceFile !== null) this.source = p.sourceFile
}

}

// 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.

export function getLineInfo(input, offset) {

for (let line = 1, cur = 0;;) {
  lineBreakG.lastIndex = cur
  let match = lineBreakG.exec(input)
  if (match && match.index < offset) {
    ++line
    cur = match.index + match[0].length
  } else {
    return new Position(line, offset - cur)
  }
}

}