ocrd_models.ocrd_mets.OcrdMets.merge() - Code Metrics - Inspection of ":package: v2.23.0" - OCR-D/core - Measure and Improve Code Quality continuously with Scrutinizer

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Push — master ( 2e0112...0ca5aa )

by Konstantin

created 2021-02-26 16:16 UTC

ocrd_models.ocrd_mets.OcrdMets.merge() A

↳ Parent: ocrd_models.ocrd_mets

Complexity

Conditions

Size

Total Lines	21
Code Lines	12

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
eloc	12
dl	0
loc	21
rs	9.8
c	0
b	0
f	0
cc	4
nop	5

"""
API to METS
"""
from datetime import datetime
from re import fullmatch, search
from lxml import etree as ET

from ocrd_utils import (
    is_local_filename,
    getLogger,
    generate_range,
    VERSION,
    REGEX_PREFIX,
    REGEX_FILE_ID
)

from .constants import (
    NAMESPACES as NS,
    TAG_METS_AGENT,
    TAG_METS_DIV,
    TAG_METS_FILE,
    TAG_METS_FILEGRP,
    TAG_METS_FILESEC,
    TAG_METS_FPTR,
    TAG_METS_METSHDR,
    TAG_METS_STRUCTMAP,
    IDENTIFIER_PRIORITY,
    TAG_MODS_IDENTIFIER,
    METS_XML_EMPTY,
)

from .ocrd_xml_base import OcrdXmlDocument, ET
from .ocrd_file import OcrdFile
from .ocrd_agent import OcrdAgent

REGEX_PREFIX_LEN = len(REGEX_PREFIX)

class OcrdMets(OcrdXmlDocument):
    """
    API to a single METS file
    """

    @staticmethod
    def empty_mets(now=None):
        """
        Create an empty METS file from bundled template.
        """
        if not now:
            now = datetime.now().isoformat()
        tpl = METS_XML_EMPTY.decode('utf-8')
        tpl = tpl.replace('{{ VERSION }}', VERSION)
        tpl = tpl.replace('{{ NOW }}', '%s' % now)
        return OcrdMets(content=tpl.encode('utf-8'))

    def __init__(self, **kwargs):
        """

        """
        super(OcrdMets, self).__init__(**kwargs)

    def __str__(self):
        """
        String representation
        """
        return 'OcrdMets[fileGrps=%s,files=%s]' % (self.file_groups, list(self.find_files()))

    @property
    def unique_identifier(self):
        """
        Get the unique identifier by looking through ``mods:identifier``

        See `specs <https://ocr-d.de/en/spec/mets#unique-id-for-the-document-processed>`_ for details.
        """
        for t in IDENTIFIER_PRIORITY:
            found = self._tree.getroot().find('.//mods:identifier[@type="%s"]' % t, NS)
            if found is not None:
                return found.text

    @unique_identifier.setter
    def unique_identifier(self, purl):
        """
        Set the unique identifier by looking through ``mods:identifier``

        See `specs <https://ocr-d.de/en/spec/mets#unique-id-for-the-document-processed>`_ for details.
        """
        id_el = None
        for t in IDENTIFIER_PRIORITY:
            id_el = self._tree.getroot().find('.//mods:identifier[@type="%s"]' % t, NS)
            if id_el is not None:
                break
        if id_el is None:
            mods = self._tree.getroot().find('.//mods:mods', NS)
            id_el = ET.SubElement(mods, TAG_MODS_IDENTIFIER)
            id_el.set('type', 'purl')
        id_el.text = purl

    @property
    def agents(self):
        """
        List all :py:class:`ocrd_models.ocrd_agent.OcrdAgent`s
        """
        return [OcrdAgent(el_agent) for el_agent in self._tree.getroot().findall('mets:metsHdr/mets:agent', NS)]

    def add_agent(self, *args, **kwargs):
        """
        Add an :py:class:`ocrd_models.ocrd_agent.OcrdAgent` to the list of agents in the `metsHdr`.
        """
        el_metsHdr = self._tree.getroot().find('.//mets:metsHdr', NS)
        if el_metsHdr is None:
            el_metsHdr = ET.Element(TAG_METS_METSHDR)
            self._tree.getroot().insert(0, el_metsHdr)
        #  assert(el_metsHdr is not None)
        el_agent = ET.SubElement(el_metsHdr, TAG_METS_AGENT)
        #  print(ET.tostring(el_metsHdr))
        return OcrdAgent(el_agent, *args, **kwargs)

    @property
    def file_groups(self):
        """
        List the `@USE` of all `mets:fileGrp` entries.
        """
        return [el.get('USE') for el in self._tree.getroot().findall('.//mets:fileGrp', NS)]

    def find_all_files(self, *args, **kwargs):
        """
        Like :py:meth:`find_files` but return a list of all results.

        Equivalent to ``list(self.find_files(...))``
        """
        return list(self.find_files(*args, **kwargs))

    # pylint: disable=multiple-statements
    def find_files(self, ID=None, fileGrp=None, pageId=None, mimetype=None, url=None, local_only=False):
        """
        Search `mets:file` entries in this METS document and yield results.


        The ``ID``, ``fileGrp``, ``url`` and ``mimetype`` parameters can each be
        either a literal string or a regular expression if the string starts
        with `//` (double slash). If it is a regex, the leading `//` is removed
        and candidates are matched against the regex with `re.fullmatch`. If it is
        a literal string, comparison is done with string equality.

        The ``pageId`` parameter supports the numeric range operator ``..``. For
        example, to find all files in pages ``PHYS_0001`` to ``PHYS_0003``, 
        ``PHYS_0001..PHYS_0003`` will be expanded to ``PHYS_0001,PHYS_0002,PHYS_0003``.

        Keyword Args:
            ID (string) : `@ID` of the `mets:file`
            fileGrp (string) : `@USE` of the `mets:fileGrp` to list files of
            pageId (string) : `@ID` of the corresponding physical `mets:structMap` entry (physical page)
            url (string) : `@xlink:href` (URL or path) of `mets:Flocat` of `mets:file`
            mimetype (string) : `@MIMETYPE` of `mets:file`
            local (boolean) : Whether to restrict results to local files in the filesystem

        Yields:
            :py:class:`ocrd_models:ocrd_file:OcrdFile` instantiations
        """
        ret = []
        if pageId:
            if pageId.startswith(REGEX_PREFIX):
                raise Exception("find_files does not support regex search for pageId")
            pageIds, pageId = pageId.split(','), list()
            pageIds_expanded = []
            for pageId_ in pageIds:
                if '..' in pageId_:
                    pageIds_expanded += generate_range(*pageId_.split('..', 2))
            pageIds += pageIds_expanded
            for page in self._tree.getroot().xpath(
                '//mets:div[@TYPE="page"]', namespaces=NS):
                if page.get('ID') in pageIds:
                    pageId.extend(
                        [fptr.get('FILEID') for fptr in page.findall('mets:fptr', NS)])
        for cand in self._tree.getroot().xpath('//mets:file', namespaces=NS):
            if ID:
                if ID.startswith(REGEX_PREFIX):
                    if not fullmatch(ID[REGEX_PREFIX_LEN:], cand.get('ID')): continue
                else:
                    if not ID == cand.get('ID'): continue

            if pageId is not None and cand.get('ID') not in pageId:
                continue

            if fileGrp:
                if fileGrp.startswith(REGEX_PREFIX):
                    if not fullmatch(fileGrp[REGEX_PREFIX_LEN:], cand.getparent().get('USE')): continue
                else:
                    if cand.getparent().get('USE') != fileGrp: continue

            if mimetype:
                if mimetype.startswith(REGEX_PREFIX):
                    if not fullmatch(mimetype[REGEX_PREFIX_LEN:], cand.get('MIMETYPE') or ''): continue
                else:
                    if cand.get('MIMETYPE') != mimetype: continue

            if url:
                cand_locat = cand.find('mets:FLocat', namespaces=NS)
                if cand_locat is None:
                    continue
                cand_url = cand_locat.get('{%s}href' % NS['xlink'])
                if url.startswith(REGEX_PREFIX):
                    if not fullmatch(url[REGEX_PREFIX_LEN:], cand_url): continue
                else:
                    if cand_url != url: continue

            f = OcrdFile(cand, mets=self)

            # If only local resources should be returned and f is not a file path: skip the file
            if local_only and not is_local_filename(f.url):
                continue
            yield f

    def add_file_group(self, fileGrp):
        """
        Add a new `mets:fileGrp`.

        Arguments:
            fileGrp (string): `@USE` of the new `mets:fileGrp`.
        """
        if ',' in fileGrp:
            raise Exception('fileGrp must not contain commas')
        el_fileSec = self._tree.getroot().find('mets:fileSec', NS)
        if el_fileSec is None:
            el_fileSec = ET.SubElement(self._tree.getroot(), TAG_METS_FILESEC)
        el_fileGrp = el_fileSec.find('mets:fileGrp[@USE="%s"]' % fileGrp, NS)
        if el_fileGrp is None:
            el_fileGrp = ET.SubElement(el_fileSec, TAG_METS_FILEGRP)
            el_fileGrp.set('USE', fileGrp)
        return el_fileGrp

    def rename_file_group(self, old, new):
        """
        Rename a `mets:fileGrp` by changing the `@USE` from ``old`` to ``new``.
        """
        el_fileGrp = self._tree.getroot().find('mets:fileSec/mets:fileGrp[@USE="%s"]' % old, NS)
        if el_fileGrp is None:
            raise FileNotFoundError("No such fileGrp '%s'" % old)
        el_fileGrp.set('USE', new)

    def remove_file_group(self, USE, recursive=False, force=False):
        """
        Remove a `mets:fileGrp` (fixed `@USE`) or `mets:fileGrp`s (regex `@USE`)

        Arguments:
            USE (string): `@USE` of the `mets:fileGrp` to delete. Can be a regex if prefixed with `//`
            recursive (boolean): Whether to recursively delete all `mets:file`s in the group
            force (boolean): Do not raise an exception if `mets:fileGrp` does not exist
        """
        log = getLogger('ocrd_models.ocrd_mets.remove_file_group')
        el_fileSec = self._tree.getroot().find('mets:fileSec', NS)
        if el_fileSec is None:
            raise Exception("No fileSec!")
        if isinstance(USE, str):
            if USE.startswith(REGEX_PREFIX):
                for cand in el_fileSec.findall('mets:fileGrp', NS):
                    if fullmatch(USE[REGEX_PREFIX_LEN:], cand.get('USE')):
                        self.remove_file_group(cand, recursive=recursive)
                return
            else:
                el_fileGrp = el_fileSec.find('mets:fileGrp[@USE="%s"]' % USE, NS)
        else:
            el_fileGrp = USE
        if el_fileGrp is None:   # pylint: disable=len-as-condition
            msg = "No such fileGrp: %s" % USE
            if force:
                log.warning(msg)
                return
            raise Exception(msg)
        files = el_fileGrp.findall('mets:file', NS)
        if files:
            if not recursive:
                raise Exception("fileGrp %s is not empty and recursive wasn't set" % USE)
            for f in files:
                self.remove_one_file(f.get('ID'))
        el_fileGrp.getparent().remove(el_fileGrp)

    def add_file(self, fileGrp, mimetype=None, url=None, ID=None, pageId=None, force=False, local_filename=None, ignore=False, **kwargs):
        """
        Instantiate and add a new :py:class:`ocrd_models.ocrd_file.OcrdFile`.

        Arguments:
            fileGrp (string): `@USE` of `mets:fileGrp` to add to
        Keyword Args:
            mimetype (string): `@MIMETYPE` of the `mets:file` to use
            url (string): `@xlink:href` (URL or path) of the `mets:file` to use
            ID (string): `@ID` of the `mets:file` to use
            pageId (string): `@ID` in the physical `mets:structMap` to link to
            force (boolean): Whether to add the file even if a `mets:file` with the same `@ID` already exists.
            ignore (boolean): Do not look for existing files at all. Shift responsibility for preventing errors from duplicate ID to the user.
            local_filename (string):
        """
        if not ID:
            raise Exception("Must set ID of the mets:file")
        elif not REGEX_FILE_ID.fullmatch(ID):
            raise Exception("Invalid syntax for mets:file/@ID %s" % ID)
        el_fileGrp = self._tree.getroot().find(".//mets:fileGrp[@USE='%s']" % (fileGrp), NS)
        if el_fileGrp is None:
            el_fileGrp = self.add_file_group(fileGrp)
        if ID and not ignore and next(self.find_files(ID=ID), None):
            if not force:
                raise Exception("File with ID='%s' already exists" % ID)
            mets_file = next(self.find_files(ID=ID))
        else:
            mets_file = OcrdFile(ET.SubElement(el_fileGrp, TAG_METS_FILE), mets=self)
        mets_file.url = url
        mets_file.mimetype = mimetype
        mets_file.ID = ID
        mets_file.pageId = pageId
        mets_file.local_filename = local_filename

        return mets_file

    def remove_file(self, *args, **kwargs):
        """
        Delete all `ocrd:file`s matching the query. Same arguments as :py:meth:`find_files`
        """
        files = list(self.find_files(*args, **kwargs))
        if files:
            for f in files:
                self.remove_one_file(f)
            if len(files) > 1:
                return files
            else:
                return files[0] # for backwards-compatibility
        raise FileNotFoundError("File not found: %s %s" % (args, kwargs))

    def remove_one_file(self, ID):
        """
        Delete an existing :py:class:`ocrd_models.ocrd_file.OcrdFile`.
        
        Arguments:
            ID (string): `@ID` of the `mets:file` to delete
            
        Returns:
            The old :py:class:`ocrd_models.ocrd_file.OcrdFile` reference.
        """
        log = getLogger('ocrd_models.ocrd_mets.remove_one_file')
        log.info("remove_one_file(%s)" % ID)
        if isinstance(ID, OcrdFile):
            ocrd_file = ID
            ID = ocrd_file.ID
        else:
            ocrd_file = next(self.find_files(ID=ID), None)

        if not ocrd_file:
            raise FileNotFoundError("File not found: %s" % ID)

        # Delete the physical page ref
        for fptr in self._tree.getroot().findall('.//mets:fptr[@FILEID="%s"]' % ID, namespaces=NS):
            log.info("Delete fptr element %s for page '%s'", fptr, ID)
            page_div = fptr.getparent()
            page_div.remove(fptr)
            # delete empty pages
            if not page_div.getchildren():
                log.info("Delete empty page %s", page_div)
                page_div.getparent().remove(page_div)

        # Delete the file reference
        # pylint: disable=protected-access
        ocrd_file._el.getparent().remove(ocrd_file._el)

        return ocrd_file

    @property
    def physical_pages(self):
        """
        List all page IDs (the `@ID`s of all physical `mets:structMap` `mets:div`s)
        """
        return self._tree.getroot().xpath(
            'mets:structMap[@TYPE="PHYSICAL"]/mets:div[@TYPE="physSequence"]/mets:div[@TYPE="page"]/@ID',
            namespaces=NS)

    def get_physical_pages(self, for_fileIds=None):
        """
        List all page IDs (the `@ID`s of all physical `mets:structMap` `mets:div`s),
        optionally for a subset of `mets:file` `@ID`s ``for_fileIds``.
        """
        if for_fileIds is None:
            return self.physical_pages
        ret = [None] * len(for_fileIds)
        for page in self._tree.getroot().xpath(
            'mets:structMap[@TYPE="PHYSICAL"]/mets:div[@TYPE="physSequence"]/mets:div[@TYPE="page"]',
                namespaces=NS):
            for fptr in page.findall('mets:fptr', NS):
                if fptr.get('FILEID') in for_fileIds:
                    ret[for_fileIds.index(fptr.get('FILEID'))] = page.get('ID')
        return ret

    def set_physical_page_for_file(self, pageId, ocrd_file, order=None, orderlabel=None):
        """
        Set the physical page ID (`@ID` of the physical `mets:structMap` `mets:div` entry)
        corresponding to the `mets:file` ``ocrd_file``, creating all structures if necessary.
        
        Arguments:
            pageId (string): `@ID` of the physical `mets:structMap` entry to use
            ocrd_file (object): existing :py:class:`ocrd_models.ocrd_file.OcrdFile` object
        Keyword Args:
            order (string): `@ORDER` to use
            orderlabel (string): `@ORDERLABEL` to use
        """
        #  print(pageId, ocrd_file)
        # delete any page mapping for this file.ID
        for el_fptr in self._tree.getroot().findall(
                'mets:structMap[@TYPE="PHYSICAL"]/mets:div[@TYPE="physSequence"]/mets:div[@TYPE="page"]/mets:fptr[@FILEID="%s"]' %
                ocrd_file.ID, namespaces=NS):
            el_fptr.getparent().remove(el_fptr)

        # find/construct as necessary
        el_structmap = self._tree.getroot().find('mets:structMap[@TYPE="PHYSICAL"]', NS)
        if el_structmap is None:
            el_structmap = ET.SubElement(self._tree.getroot(), TAG_METS_STRUCTMAP)
            el_structmap.set('TYPE', 'PHYSICAL')
        el_seqdiv = el_structmap.find('mets:div[@TYPE="physSequence"]', NS)
        if el_seqdiv is None:
            el_seqdiv = ET.SubElement(el_structmap, TAG_METS_DIV)
            el_seqdiv.set('TYPE', 'physSequence')
        el_pagediv = el_seqdiv.find('mets:div[@ID="%s"]' % pageId, NS)
        if el_pagediv is None:
            el_pagediv = ET.SubElement(el_seqdiv, TAG_METS_DIV)
            el_pagediv.set('TYPE', 'page')
            el_pagediv.set('ID', pageId)
            if order:
                el_pagediv.set('ORDER', order)
            if orderlabel:
                el_pagediv.set('ORDERLABEL', orderlabel)
        el_fptr = ET.SubElement(el_pagediv, TAG_METS_FPTR)
        el_fptr.set('FILEID', ocrd_file.ID)

    def get_physical_page_for_file(self, ocrd_file):
        """
        Get the physical page ID (`@ID` of the physical `mets:structMap` `mets:div` entry)
        corresponding to the `mets:file` ``ocrd_file``.
        """
        ret = self._tree.getroot().xpath(
            '/mets:mets/mets:structMap[@TYPE="PHYSICAL"]/mets:div[@TYPE="physSequence"]/mets:div[@TYPE="page"][./mets:fptr[@FILEID="%s"]]/@ID' %
            ocrd_file.ID, namespaces=NS)
        if ret:
            return ret[0]

    def remove_physical_page(self, ID):
        """
        Delete page (physical `mets:structMap` `mets:div` entry `@ID`) ``ID``.
        """
        mets_div = self._tree.getroot().xpath(
            'mets:structMap[@TYPE="PHYSICAL"]/mets:div[@TYPE="physSequence"]/mets:div[@TYPE="page"][@ID="%s"]' % ID,
            namespaces=NS)
        if mets_div:
            mets_div[0].getparent().remove(mets_div[0])

    def merge(self, other_mets, fileGrp_mapping=None, after_add_cb=None, **kwargs):
        """
        Add all files from other_mets.

        Accepts the same kwargs as :py:func:find_files

        Keyword Args:
            fileGrp_mapping (dict): Map ``other_mets`` fileGrp to fileGrp in this METS
            after_add_cb (function): Callback received after file is added to the METS
        """
        if not fileGrp_mapping:
            fileGrp_mapping = {}
        for f_src in other_mets.find_files(**kwargs):
            f_dest = self.add_file(
                    fileGrp_mapping.get(f_src.fileGrp, f_src.fileGrp),
                    mimetype=f_src.mimetype,
                    url=f_src.url,
                    ID=f_src.ID,
                    pageId=f_src.pageId)
            if after_add_cb:
                after_add_cb(f_dest)



1			"""
2			API to METS
3			"""
4			from datetime import datetime
5			from re import fullmatch, search
6			from lxml import etree as ET
7
8			from ocrd_utils import (
9			is_local_filename,
10			getLogger,
11			generate_range,
12			VERSION,
13			REGEX_PREFIX,
14			REGEX_FILE_ID
15			)
16
17			from .constants import (
18			NAMESPACES as NS,
19			TAG_METS_AGENT,
20			TAG_METS_DIV,
21			TAG_METS_FILE,
22			TAG_METS_FILEGRP,
23			TAG_METS_FILESEC,
24			TAG_METS_FPTR,
25			TAG_METS_METSHDR,
26			TAG_METS_STRUCTMAP,
27			IDENTIFIER_PRIORITY,
28			TAG_MODS_IDENTIFIER,
29			METS_XML_EMPTY,
30			)
31
32			from .ocrd_xml_base import OcrdXmlDocument, ET
33			from .ocrd_file import OcrdFile
34			from .ocrd_agent import OcrdAgent
35
36			REGEX_PREFIX_LEN = len(REGEX_PREFIX)
37
38			class OcrdMets(OcrdXmlDocument):
39			"""
40			API to a single METS file
41			"""
42
43			@staticmethod
44			def empty_mets(now=None):
45			"""
46			Create an empty METS file from bundled template.
47			"""
48			if not now:
49			now = datetime.now().isoformat()
50			tpl = METS_XML_EMPTY.decode('utf-8')
51			tpl = tpl.replace('{{ VERSION }}', VERSION)
52			tpl = tpl.replace('{{ NOW }}', '%s' % now)
53			return OcrdMets(content=tpl.encode('utf-8'))
54
55			def __init__(self, **kwargs):
56			"""
57
58			"""
59			super(OcrdMets, self).__init__(**kwargs)
60
61			def __str__(self):
62			"""
63			String representation
64			"""
65			return 'OcrdMets[fileGrps=%s,files=%s]' % (self.file_groups, list(self.find_files()))
66
67			@property
68			def unique_identifier(self):
69			"""
70			Get the unique identifier by looking through ``mods:identifier``
71
72			See `specs <https://ocr-d.de/en/spec/mets#unique-id-for-the-document-processed>`_ for details.
73			"""
74			for t in IDENTIFIER_PRIORITY:
75			found = self._tree.getroot().find('.//mods:identifier[@type="%s"]' % t, NS)
76			if found is not None:
77			return found.text
78
79			@unique_identifier.setter
80			def unique_identifier(self, purl):
81			"""
82			Set the unique identifier by looking through ``mods:identifier``
83
84			See `specs <https://ocr-d.de/en/spec/mets#unique-id-for-the-document-processed>`_ for details.
85			"""
86			id_el = None
87			for t in IDENTIFIER_PRIORITY:
88			id_el = self._tree.getroot().find('.//mods:identifier[@type="%s"]' % t, NS)
89			if id_el is not None:
90			break
91			if id_el is None:
92			mods = self._tree.getroot().find('.//mods:mods', NS)
93			id_el = ET.SubElement(mods, TAG_MODS_IDENTIFIER)
94			id_el.set('type', 'purl')
95			id_el.text = purl
96
97			@property
98			def agents(self):
99			"""
100			List all :py:class:`ocrd_models.ocrd_agent.OcrdAgent`s
101			"""
102			return [OcrdAgent(el_agent) for el_agent in self._tree.getroot().findall('mets:metsHdr/mets:agent', NS)]
103
104			def add_agent(self, args, *kwargs):
105			"""
106			Add an :py:class:`ocrd_models.ocrd_agent.OcrdAgent` to the list of agents in the `metsHdr`.
107			"""
108			el_metsHdr = self._tree.getroot().find('.//mets:metsHdr', NS)
109			if el_metsHdr is None:
110			el_metsHdr = ET.Element(TAG_METS_METSHDR)
111			self._tree.getroot().insert(0, el_metsHdr)
112			# assert(el_metsHdr is not None)
113			el_agent = ET.SubElement(el_metsHdr, TAG_METS_AGENT)
114			# print(ET.tostring(el_metsHdr))
115			return OcrdAgent(el_agent, args, *kwargs)
116
117			@property
118			def file_groups(self):
119			"""
120			List the `@USE` of all `mets:fileGrp` entries.
121			"""
122			return [el.get('USE') for el in self._tree.getroot().findall('.//mets:fileGrp', NS)]
123
124			def find_all_files(self, args, *kwargs):
125			"""
126			Like :py:meth:`find_files` but return a list of all results.
127
128			Equivalent to ``list(self.find_files(...))``
129			"""
130			return list(self.find_files(args, *kwargs))
131
132			# pylint: disable=multiple-statements
133			def find_files(self, ID=None, fileGrp=None, pageId=None, mimetype=None, url=None, local_only=False):
134			"""
135			Search `mets:file` entries in this METS document and yield results.
136
137
138			The ``ID``, ``fileGrp``, ``url`` and ``mimetype`` parameters can each be
139			either a literal string or a regular expression if the string starts
140			with `//` (double slash). If it is a regex, the leading `//` is removed
141			and candidates are matched against the regex with `re.fullmatch`. If it is
142			a literal string, comparison is done with string equality.
143
144			The ``pageId`` parameter supports the numeric range operator ``..``. For
145			example, to find all files in pages ``PHYS_0001`` to ``PHYS_0003``,
146			``PHYS_0001..PHYS_0003`` will be expanded to ``PHYS_0001,PHYS_0002,PHYS_0003``.
147
148			Keyword Args:
149			ID (string) : `@ID` of the `mets:file`
150			fileGrp (string) : `@USE` of the `mets:fileGrp` to list files of
151			pageId (string) : `@ID` of the corresponding physical `mets:structMap` entry (physical page)
152			url (string) : `@xlink:href` (URL or path) of `mets:Flocat` of `mets:file`
153			mimetype (string) : `@MIMETYPE` of `mets:file`
154			local (boolean) : Whether to restrict results to local files in the filesystem
155
156			Yields:
157			:py:class:`ocrd_models:ocrd_file:OcrdFile` instantiations
158			"""
159			ret = []
160			if pageId:
161			if pageId.startswith(REGEX_PREFIX):
162			raise Exception("find_files does not support regex search for pageId")
163			pageIds, pageId = pageId.split(','), list()
164			pageIds_expanded = []
165			for pageId_ in pageIds:
166			if '..' in pageId_:
167			pageIds_expanded += generate_range(*pageId_.split('..', 2))
168			pageIds += pageIds_expanded
169			for page in self._tree.getroot().xpath(
170			'//mets:div[@TYPE="page"]', namespaces=NS):
171			if page.get('ID') in pageIds:
172			pageId.extend(
173			[fptr.get('FILEID') for fptr in page.findall('mets:fptr', NS)])
174			for cand in self._tree.getroot().xpath('//mets:file', namespaces=NS):
175			if ID:
176			if ID.startswith(REGEX_PREFIX):
177			if not fullmatch(ID[REGEX_PREFIX_LEN:], cand.get('ID')): continue
178			else:
179			if not ID == cand.get('ID'): continue
180
181			if pageId is not None and cand.get('ID') not in pageId:
182			continue
183
184			if fileGrp:
185			if fileGrp.startswith(REGEX_PREFIX):
186			if not fullmatch(fileGrp[REGEX_PREFIX_LEN:], cand.getparent().get('USE')): continue
187			else:
188			if cand.getparent().get('USE') != fileGrp: continue
189
190			if mimetype:
191			if mimetype.startswith(REGEX_PREFIX):
192			if not fullmatch(mimetype[REGEX_PREFIX_LEN:], cand.get('MIMETYPE') or ''): continue
193			else:
194			if cand.get('MIMETYPE') != mimetype: continue
195
196			if url:
197			cand_locat = cand.find('mets:FLocat', namespaces=NS)
198			if cand_locat is None:
199			continue
200			cand_url = cand_locat.get('{%s}href' % NS['xlink'])
201			if url.startswith(REGEX_PREFIX):
202			if not fullmatch(url[REGEX_PREFIX_LEN:], cand_url): continue
203			else:
204			if cand_url != url: continue
205
206			f = OcrdFile(cand, mets=self)
207
208			# If only local resources should be returned and f is not a file path: skip the file
209			if local_only and not is_local_filename(f.url):
210			continue
211			yield f
212
213			def add_file_group(self, fileGrp):
214			"""
215			Add a new `mets:fileGrp`.
216
217			Arguments:
218			fileGrp (string): `@USE` of the new `mets:fileGrp`.
219			"""
220			if ',' in fileGrp:
221			raise Exception('fileGrp must not contain commas')
222			el_fileSec = self._tree.getroot().find('mets:fileSec', NS)
223			if el_fileSec is None:
224			el_fileSec = ET.SubElement(self._tree.getroot(), TAG_METS_FILESEC)
225			el_fileGrp = el_fileSec.find('mets:fileGrp[@USE="%s"]' % fileGrp, NS)
226			if el_fileGrp is None:
227			el_fileGrp = ET.SubElement(el_fileSec, TAG_METS_FILEGRP)
228			el_fileGrp.set('USE', fileGrp)
229			return el_fileGrp
230
231			def rename_file_group(self, old, new):
232			"""
233			Rename a `mets:fileGrp` by changing the `@USE` from ``old`` to ``new``.
234			"""
235			el_fileGrp = self._tree.getroot().find('mets:fileSec/mets:fileGrp[@USE="%s"]' % old, NS)
236			if el_fileGrp is None:
237			raise FileNotFoundError("No such fileGrp '%s'" % old)
238			el_fileGrp.set('USE', new)
239
240			def remove_file_group(self, USE, recursive=False, force=False):
241			"""
242			Remove a `mets:fileGrp` (fixed `@USE`) or `mets:fileGrp`s (regex `@USE`)
243
244			Arguments:
245			USE (string): `@USE` of the `mets:fileGrp` to delete. Can be a regex if prefixed with `//`
246			recursive (boolean): Whether to recursively delete all `mets:file`s in the group
247			force (boolean): Do not raise an exception if `mets:fileGrp` does not exist
248			"""
249			log = getLogger('ocrd_models.ocrd_mets.remove_file_group')
250			el_fileSec = self._tree.getroot().find('mets:fileSec', NS)
251			if el_fileSec is None:
252			raise Exception("No fileSec!")
253			if isinstance(USE, str):
254			if USE.startswith(REGEX_PREFIX):
255			for cand in el_fileSec.findall('mets:fileGrp', NS):
256			if fullmatch(USE[REGEX_PREFIX_LEN:], cand.get('USE')):
257			self.remove_file_group(cand, recursive=recursive)
258			return
259			else:
260			el_fileGrp = el_fileSec.find('mets:fileGrp[@USE="%s"]' % USE, NS)
261			else:
262			el_fileGrp = USE
263			if el_fileGrp is None: # pylint: disable=len-as-condition
264			msg = "No such fileGrp: %s" % USE
265			if force:
266			log.warning(msg)
267			return
268			raise Exception(msg)
269			files = el_fileGrp.findall('mets:file', NS)
270			if files:
271			if not recursive:
272			raise Exception("fileGrp %s is not empty and recursive wasn't set" % USE)
273			for f in files:
274			self.remove_one_file(f.get('ID'))
275			el_fileGrp.getparent().remove(el_fileGrp)
276
277			def add_file(self, fileGrp, mimetype=None, url=None, ID=None, pageId=None, force=False, local_filename=None, ignore=False, **kwargs):
278			"""
279			Instantiate and add a new :py:class:`ocrd_models.ocrd_file.OcrdFile`.
280
281			Arguments:
282			fileGrp (string): `@USE` of `mets:fileGrp` to add to
283			Keyword Args:
284			mimetype (string): `@MIMETYPE` of the `mets:file` to use
285			url (string): `@xlink:href` (URL or path) of the `mets:file` to use
286			ID (string): `@ID` of the `mets:file` to use
287			pageId (string): `@ID` in the physical `mets:structMap` to link to
288			force (boolean): Whether to add the file even if a `mets:file` with the same `@ID` already exists.
289			ignore (boolean): Do not look for existing files at all. Shift responsibility for preventing errors from duplicate ID to the user.
290			local_filename (string):
291			"""
292			if not ID:
293			raise Exception("Must set ID of the mets:file")
294			elif not REGEX_FILE_ID.fullmatch(ID):
295			raise Exception("Invalid syntax for mets:file/@ID %s" % ID)
296			el_fileGrp = self._tree.getroot().find(".//mets:fileGrp[@USE='%s']" % (fileGrp), NS)
297			if el_fileGrp is None:
298			el_fileGrp = self.add_file_group(fileGrp)
299			if ID and not ignore and next(self.find_files(ID=ID), None):
300			if not force:
301			raise Exception("File with ID='%s' already exists" % ID)
302			mets_file = next(self.find_files(ID=ID))
303			else:
304			mets_file = OcrdFile(ET.SubElement(el_fileGrp, TAG_METS_FILE), mets=self)
305			mets_file.url = url
306			mets_file.mimetype = mimetype
307			mets_file.ID = ID
308			mets_file.pageId = pageId
309			mets_file.local_filename = local_filename
310
311			return mets_file
312
313			def remove_file(self, args, *kwargs):
314			"""
315			Delete all `ocrd:file`s matching the query. Same arguments as :py:meth:`find_files`
316			"""
317			files = list(self.find_files(args, *kwargs))
318			if files:
319			for f in files:
320			self.remove_one_file(f)
321			if len(files) > 1:
322			return files
323			else:
324			return files[0] # for backwards-compatibility
325			raise FileNotFoundError("File not found: %s %s" % (args, kwargs))
326
327			def remove_one_file(self, ID):
328			"""
329			Delete an existing :py:class:`ocrd_models.ocrd_file.OcrdFile`.
330
331			Arguments:
332			ID (string): `@ID` of the `mets:file` to delete
333
334			Returns:
335			The old :py:class:`ocrd_models.ocrd_file.OcrdFile` reference.
336			"""
337			log = getLogger('ocrd_models.ocrd_mets.remove_one_file')
338			log.info("remove_one_file(%s)" % ID)
339			if isinstance(ID, OcrdFile):
340			ocrd_file = ID
341			ID = ocrd_file.ID
342			else:
343			ocrd_file = next(self.find_files(ID=ID), None)
344
345			if not ocrd_file:
346			raise FileNotFoundError("File not found: %s" % ID)
347
348			# Delete the physical page ref
349			for fptr in self._tree.getroot().findall('.//mets:fptr[@FILEID="%s"]' % ID, namespaces=NS):
350			log.info("Delete fptr element %s for page '%s'", fptr, ID)
351			page_div = fptr.getparent()
352			page_div.remove(fptr)
353			# delete empty pages
354			if not page_div.getchildren():
355			log.info("Delete empty page %s", page_div)
356			page_div.getparent().remove(page_div)
357
358			# Delete the file reference
359			# pylint: disable=protected-access
360			ocrd_file._el.getparent().remove(ocrd_file._el)
361
362			return ocrd_file
363
364			@property
365			def physical_pages(self):
366			"""
367			List all page IDs (the `@ID`s of all physical `mets:structMap` `mets:div`s)
368			"""
369			return self._tree.getroot().xpath(
370			'mets:structMap[@TYPE="PHYSICAL"]/mets:div[@TYPE="physSequence"]/mets:div[@TYPE="page"]/@ID',
371			namespaces=NS)
372
373			def get_physical_pages(self, for_fileIds=None):
374			"""
375			List all page IDs (the `@ID`s of all physical `mets:structMap` `mets:div`s),
376			optionally for a subset of `mets:file` `@ID`s ``for_fileIds``.
377			"""
378			if for_fileIds is None:
379			return self.physical_pages
380			ret = [None] * len(for_fileIds)
381			for page in self._tree.getroot().xpath(
382			'mets:structMap[@TYPE="PHYSICAL"]/mets:div[@TYPE="physSequence"]/mets:div[@TYPE="page"]',
383			namespaces=NS):
384			for fptr in page.findall('mets:fptr', NS):
385			if fptr.get('FILEID') in for_fileIds:
386			ret[for_fileIds.index(fptr.get('FILEID'))] = page.get('ID')
387			return ret
388
389			def set_physical_page_for_file(self, pageId, ocrd_file, order=None, orderlabel=None):
390			"""
391			Set the physical page ID (`@ID` of the physical `mets:structMap` `mets:div` entry)
392			corresponding to the `mets:file` ``ocrd_file``, creating all structures if necessary.
393
394			Arguments:
395			pageId (string): `@ID` of the physical `mets:structMap` entry to use
396			ocrd_file (object): existing :py:class:`ocrd_models.ocrd_file.OcrdFile` object
397			Keyword Args:
398			order (string): `@ORDER` to use
399			orderlabel (string): `@ORDERLABEL` to use
400			"""
401			# print(pageId, ocrd_file)
402			# delete any page mapping for this file.ID
403			for el_fptr in self._tree.getroot().findall(
404			'mets:structMap[@TYPE="PHYSICAL"]/mets:div[@TYPE="physSequence"]/mets:div[@TYPE="page"]/mets:fptr[@FILEID="%s"]' %
405			ocrd_file.ID, namespaces=NS):
406			el_fptr.getparent().remove(el_fptr)
407
408			# find/construct as necessary
409			el_structmap = self._tree.getroot().find('mets:structMap[@TYPE="PHYSICAL"]', NS)
410			if el_structmap is None:
411			el_structmap = ET.SubElement(self._tree.getroot(), TAG_METS_STRUCTMAP)
412			el_structmap.set('TYPE', 'PHYSICAL')
413			el_seqdiv = el_structmap.find('mets:div[@TYPE="physSequence"]', NS)
414			if el_seqdiv is None:
415			el_seqdiv = ET.SubElement(el_structmap, TAG_METS_DIV)
416			el_seqdiv.set('TYPE', 'physSequence')
417			el_pagediv = el_seqdiv.find('mets:div[@ID="%s"]' % pageId, NS)
418			if el_pagediv is None:
419			el_pagediv = ET.SubElement(el_seqdiv, TAG_METS_DIV)
420			el_pagediv.set('TYPE', 'page')
421			el_pagediv.set('ID', pageId)
422			if order:
423			el_pagediv.set('ORDER', order)
424			if orderlabel:
425			el_pagediv.set('ORDERLABEL', orderlabel)
426			el_fptr = ET.SubElement(el_pagediv, TAG_METS_FPTR)
427			el_fptr.set('FILEID', ocrd_file.ID)
428
429			def get_physical_page_for_file(self, ocrd_file):
430			"""
431			Get the physical page ID (`@ID` of the physical `mets:structMap` `mets:div` entry)
432			corresponding to the `mets:file` ``ocrd_file``.
433			"""
434			ret = self._tree.getroot().xpath(
435			'/mets:mets/mets:structMap[@TYPE="PHYSICAL"]/mets:div[@TYPE="physSequence"]/mets:div[@TYPE="page"][./mets:fptr[@FILEID="%s"]]/@ID' %
436			ocrd_file.ID, namespaces=NS)
437			if ret:
438			return ret[0]
439
440			def remove_physical_page(self, ID):
441			"""
442			Delete page (physical `mets:structMap` `mets:div` entry `@ID`) ``ID``.
443			"""
444			mets_div = self._tree.getroot().xpath(
445			'mets:structMap[@TYPE="PHYSICAL"]/mets:div[@TYPE="physSequence"]/mets:div[@TYPE="page"][@ID="%s"]' % ID,
446			namespaces=NS)
447			if mets_div:
448			mets_div[0].getparent().remove(mets_div[0])
449
450			def merge(self, other_mets, fileGrp_mapping=None, after_add_cb=None, **kwargs):
451			"""
452			Add all files from other_mets.
453
454			Accepts the same kwargs as :py:func:find_files
455
456			Keyword Args:
457			fileGrp_mapping (dict): Map ``other_mets`` fileGrp to fileGrp in this METS
458			after_add_cb (function): Callback received after file is added to the METS
459			"""
460			if not fileGrp_mapping:
461			fileGrp_mapping = {}
462			for f_src in other_mets.find_files(**kwargs):
463			f_dest = self.add_file(
464			fileGrp_mapping.get(f_src.fileGrp, f_src.fileGrp),
465			mimetype=f_src.mimetype,
466			url=f_src.url,
467			ID=f_src.ID,
468			pageId=f_src.pageId)
469			if after_add_cb:
470			after_add_cb(f_dest)
471
472

OCR-D / core

Push — master ( 2e0112...0ca5aa )

ocrd_models.ocrd_mets.OcrdMets.merge() A

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