1 files changed, 258 insertions, 0 deletions
diff --git a/.venv/lib/python3.12/site-packages/docx/opc/pkgreader.py b/.venv/lib/python3.12/site-packages/docx/opc/pkgreader.py
new file mode 100644
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+++ b/.venv/lib/python3.12/site-packages/docx/opc/pkgreader.py
@@ -0,0 +1,258 @@
+"""Low-level, read-only API to a serialized Open Packaging Convention (OPC) package."""
+
+from docx.opc.constants import RELATIONSHIP_TARGET_MODE as RTM
+from docx.opc.oxml import parse_xml
+from docx.opc.packuri import PACKAGE_URI, PackURI
+from docx.opc.phys_pkg import PhysPkgReader
+from docx.opc.shared import CaseInsensitiveDict
+
+
+class PackageReader:
+    """Provides access to the contents of a zip-format OPC package via its
+    :attr:`serialized_parts` and :attr:`pkg_srels` attributes."""
+
+    def __init__(self, content_types, pkg_srels, sparts):
+        super(PackageReader, self).__init__()
+        self._pkg_srels = pkg_srels
+        self._sparts = sparts
+
+    @staticmethod
+    def from_file(pkg_file):
+        """Return a |PackageReader| instance loaded with contents of `pkg_file`."""
+        phys_reader = PhysPkgReader(pkg_file)
+        content_types = _ContentTypeMap.from_xml(phys_reader.content_types_xml)
+        pkg_srels = PackageReader._srels_for(phys_reader, PACKAGE_URI)
+        sparts = PackageReader._load_serialized_parts(
+            phys_reader, pkg_srels, content_types
+        )
+        phys_reader.close()
+        return PackageReader(content_types, pkg_srels, sparts)
+
+    def iter_sparts(self):
+        """Generate a 4-tuple `(partname, content_type, reltype, blob)` for each of the
+        serialized parts in the package."""
+        for s in self._sparts:
+            yield (s.partname, s.content_type, s.reltype, s.blob)
+
+    def iter_srels(self):
+        """Generate a 2-tuple `(source_uri, srel)` for each of the relationships in the
+        package."""
+        for srel in self._pkg_srels:
+            yield (PACKAGE_URI, srel)
+        for spart in self._sparts:
+            for srel in spart.srels:
+                yield (spart.partname, srel)
+
+    @staticmethod
+    def _load_serialized_parts(phys_reader, pkg_srels, content_types):
+        """Return a list of |_SerializedPart| instances corresponding to the parts in
+        `phys_reader` accessible by walking the relationship graph starting with
+        `pkg_srels`."""
+        sparts = []
+        part_walker = PackageReader._walk_phys_parts(phys_reader, pkg_srels)
+        for partname, blob, reltype, srels in part_walker:
+            content_type = content_types[partname]
+            spart = _SerializedPart(partname, content_type, reltype, blob, srels)
+            sparts.append(spart)
+        return tuple(sparts)
+
+    @staticmethod
+    def _srels_for(phys_reader, source_uri):
+        """Return |_SerializedRelationships| instance populated with relationships for
+        source identified by `source_uri`."""
+        rels_xml = phys_reader.rels_xml_for(source_uri)
+        return _SerializedRelationships.load_from_xml(source_uri.baseURI, rels_xml)
+
+    @staticmethod
+    def _walk_phys_parts(phys_reader, srels, visited_partnames=None):
+        """Generate a 4-tuple `(partname, blob, reltype, srels)` for each of the parts
+        in `phys_reader` by walking the relationship graph rooted at srels."""
+        if visited_partnames is None:
+            visited_partnames = []
+        for srel in srels:
+            if srel.is_external:
+                continue
+            partname = srel.target_partname
+            if partname in visited_partnames:
+                continue
+            visited_partnames.append(partname)
+            reltype = srel.reltype
+            part_srels = PackageReader._srels_for(phys_reader, partname)
+            blob = phys_reader.blob_for(partname)
+            yield (partname, blob, reltype, part_srels)
+            next_walker = PackageReader._walk_phys_parts(
+                phys_reader, part_srels, visited_partnames
+            )
+            for partname, blob, reltype, srels in next_walker:
+                yield (partname, blob, reltype, srels)
+
+
+class _ContentTypeMap:
+    """Value type providing dictionary semantics for looking up content type by part
+    name, e.g. ``content_type = cti['/ppt/presentation.xml']``."""
+
+    def __init__(self):
+        super(_ContentTypeMap, self).__init__()
+        self._overrides = CaseInsensitiveDict()
+        self._defaults = CaseInsensitiveDict()
+
+    def __getitem__(self, partname):
+        """Return content type for part identified by `partname`."""
+        if not isinstance(partname, PackURI):
+            tmpl = "_ContentTypeMap key must be <type 'PackURI'>, got %s"
+            raise KeyError(tmpl % type(partname))
+        if partname in self._overrides:
+            return self._overrides[partname]
+        if partname.ext in self._defaults:
+            return self._defaults[partname.ext]
+        tmpl = "no content type for partname '%s' in [Content_Types].xml"
+        raise KeyError(tmpl % partname)
+
+    @staticmethod
+    def from_xml(content_types_xml):
+        """Return a new |_ContentTypeMap| instance populated with the contents of
+        `content_types_xml`."""
+        types_elm = parse_xml(content_types_xml)
+        ct_map = _ContentTypeMap()
+        for o in types_elm.overrides:
+            ct_map._add_override(o.partname, o.content_type)
+        for d in types_elm.defaults:
+            ct_map._add_default(d.extension, d.content_type)
+        return ct_map
+
+    def _add_default(self, extension, content_type):
+        """Add the default mapping of `extension` to `content_type` to this content type
+        mapping."""
+        self._defaults[extension] = content_type
+
+    def _add_override(self, partname, content_type):
+        """Add the default mapping of `partname` to `content_type` to this content type
+        mapping."""
+        self._overrides[partname] = content_type
+
+
+class _SerializedPart:
+    """Value object for an OPC package part.
+
+    Provides access to the partname, content type, blob, and serialized relationships
+    for the part.
+    """
+
+    def __init__(self, partname, content_type, reltype, blob, srels):
+        super(_SerializedPart, self).__init__()
+        self._partname = partname
+        self._content_type = content_type
+        self._reltype = reltype
+        self._blob = blob
+        self._srels = srels
+
+    @property
+    def partname(self):
+        return self._partname
+
+    @property
+    def content_type(self):
+        return self._content_type
+
+    @property
+    def blob(self):
+        return self._blob
+
+    @property
+    def reltype(self):
+        """The referring relationship type of this part."""
+        return self._reltype
+
+    @property
+    def srels(self):
+        return self._srels
+
+
+class _SerializedRelationship:
+    """Value object representing a serialized relationship in an OPC package.
+
+    Serialized, in this case, means any target part is referred to via its partname
+    rather than a direct link to an in-memory |Part| object.
+    """
+
+    def __init__(self, baseURI, rel_elm):
+        super(_SerializedRelationship, self).__init__()
+        self._baseURI = baseURI
+        self._rId = rel_elm.rId
+        self._reltype = rel_elm.reltype
+        self._target_mode = rel_elm.target_mode
+        self._target_ref = rel_elm.target_ref
+
+    @property
+    def is_external(self):
+        """True if target_mode is ``RTM.EXTERNAL``"""
+        return self._target_mode == RTM.EXTERNAL
+
+    @property
+    def reltype(self):
+        """Relationship type, like ``RT.OFFICE_DOCUMENT``"""
+        return self._reltype
+
+    @property
+    def rId(self):
+        """Relationship id, like 'rId9', corresponds to the ``Id`` attribute on the
+        ``CT_Relationship`` element."""
+        return self._rId
+
+    @property
+    def target_mode(self):
+        """String in ``TargetMode`` attribute of ``CT_Relationship`` element, one of
+        ``RTM.INTERNAL`` or ``RTM.EXTERNAL``."""
+        return self._target_mode
+
+    @property
+    def target_ref(self):
+        """String in ``Target`` attribute of ``CT_Relationship`` element, a relative
+        part reference for internal target mode or an arbitrary URI, e.g. an HTTP URL,
+        for external target mode."""
+        return self._target_ref
+
+    @property
+    def target_partname(self):
+        """|PackURI| instance containing partname targeted by this relationship.
+
+        Raises ``ValueError`` on reference if target_mode is ``'External'``. Use
+        :attr:`target_mode` to check before referencing.
+        """
+        if self.is_external:
+            msg = (
+                "target_partname attribute on Relationship is undefined w"
+                'here TargetMode == "External"'
+            )
+            raise ValueError(msg)
+        # lazy-load _target_partname attribute
+        if not hasattr(self, "_target_partname"):
+            self._target_partname = PackURI.from_rel_ref(self._baseURI, self.target_ref)
+        return self._target_partname
+
+
+class _SerializedRelationships:
+    """Read-only sequence of |_SerializedRelationship| instances corresponding to the
+    relationships item XML passed to constructor."""
+
+    def __init__(self):
+        super(_SerializedRelationships, self).__init__()
+        self._srels = []
+
+    def __iter__(self):
+        """Support iteration, e.g. 'for x in srels:'."""
+        return self._srels.__iter__()
+
+    @staticmethod
+    def load_from_xml(baseURI, rels_item_xml):
+        """Return |_SerializedRelationships| instance loaded with the relationships
+        contained in `rels_item_xml`.
+
+        Returns an empty collection if `rels_item_xml` is |None|.
+        """
+        srels = _SerializedRelationships()
+        if rels_item_xml is not None:
+            rels_elm = parse_xml(rels_item_xml)
+            for rel_elm in rels_elm.Relationship_lst:
+                srels._srels.append(_SerializedRelationship(baseURI, rel_elm))
+        return srels