Method moveBy

packages/compiler/src/parse_util.ts:23–55

(delta: number)

  }

  moveBy(delta: number): ParseLocation {
    const source = this.file.content;
    const len = source.length;
    let offset = this.offset;
    let line = this.line;
    let col = this.col;
    while (offset > 0 && delta < 0) {
      offset--;
      delta++;
      const ch = source.charCodeAt(offset);
      if (ch == chars.$LF) {
        line--;
        const priorLine = source
          .substring(0, offset - 1)
          .lastIndexOf(String.fromCharCode(chars.$LF));
        col = priorLine > 0 ? offset - priorLine : offset;
      } else {
        col--;
      }
    }
    while (offset < len && delta > 0) {
      const ch = source.charCodeAt(offset);
      offset++;
      delta--;
      if (ch == chars.$LF) {
        line++;
        col = 0;
      } else {
        col++;
      }
    }
    return new ParseLocation(this.file, offset, line, col);
  }

  // Return the source around the location
  // Up to `maxChars` or `maxLines` on each side of the location