"""Custom exception hierarchy for pdf2imos pipeline."""


class Pdf2ImosError(Exception):
    """Base exception for all pdf2imos errors."""


class PdfExtractionError(Pdf2ImosError):
    """Raised when PDF extraction fails.

    Covers: invalid/corrupt PDF, empty PDF (0 pages),
    raster-only PDF (no vector content).
    """


class ViewSegmentationError(Pdf2ImosError):
    """Raised when view segmentation fails."""


class DimensionExtractionError(Pdf2ImosError):
    """Raised when dimension extraction or assembly fails.

    Covers: no dimensions found, assembly returns None.
    """


class OutputWriteError(Pdf2ImosError):
    """Raised when writing output files (DXF/JSON/DWG) fails."""