| 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) |
| } |
| } |
| } |