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""" |
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Processor base class and helper functions |
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""" |
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__all__ = ['Processor', 'generate_processor_help', 'run_cli', 'run_processo'] |
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import os |
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import json |
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from ocrd_utils import getLogger, VERSION as OCRD_VERSION, MIMETYPE_PAGE |
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from ocrd_validators import ParameterValidator |
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from ocrd_models.ocrd_page import MetadataItemType, LabelType, LabelsType |
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# XXX imports must remain for backwards-compatibilty |
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from .helpers import run_cli, run_processor, generate_processor_help # pylint: disable=unused-import |
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log = getLogger('ocrd.processor') |
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class Processor(): |
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""" |
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A processor runs an algorithm based on the workspace, the mets.xml in the |
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workspace (and the input files defined therein) as well as optional |
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parameter. |
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""" |
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def __init__( |
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self, |
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workspace, |
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ocrd_tool=None, |
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parameter=None, |
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# TODO OCR-D/core#274 |
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# input_file_grp=None, |
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# output_file_grp=None, |
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input_file_grp="INPUT", |
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output_file_grp="OUTPUT", |
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page_id=None, |
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show_help=False, |
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show_version=False, |
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dump_json=False, |
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version=None |
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): |
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if parameter is None: |
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parameter = {} |
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if dump_json: |
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print(json.dumps(ocrd_tool, indent=True)) |
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return |
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self.ocrd_tool = ocrd_tool |
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if show_help: |
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self.show_help() |
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return |
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self.version = version |
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if show_version: |
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self.show_version() |
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return |
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self.workspace = workspace |
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# FIXME HACK would be better to use pushd_popd(self.workspace.directory) |
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# but there is no way to do that in process here since it's an |
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# overridden method. chdir is almost always an anti-pattern. |
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if self.workspace: |
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os.chdir(self.workspace.directory) |
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self.input_file_grp = input_file_grp |
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self.output_file_grp = output_file_grp |
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self.page_id = None if page_id == [] or page_id is None else page_id |
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parameterValidator = ParameterValidator(ocrd_tool) |
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report = parameterValidator.validate(parameter) |
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if not report.is_valid: |
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raise Exception("Invalid parameters %s" % report.errors) |
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self.parameter = parameter |
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def show_help(self): |
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print(generate_processor_help(self.ocrd_tool)) |
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def show_version(self): |
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print("Version %s, ocrd/core %s" % (self.version, OCRD_VERSION)) |
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def verify(self): |
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""" |
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Verify that the input fulfills the processor's requirements. |
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""" |
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return True |
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def process(self): |
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""" |
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Process the workspace |
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""" |
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raise Exception("Must be implemented") |
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def add_metadata(self, pcgts): |
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""" |
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Adds PAGE-XML MetadataItem describing the processing step |
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""" |
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pcgts.get_Metadata().add_MetadataItem( |
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MetadataItemType(type_="processingStep", |
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name=self.ocrd_tool['steps'][0], |
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value=self.ocrd_tool['executable'], |
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Labels=[LabelsType( |
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externalModel="ocrd-tool", |
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externalId="parameters", |
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Label=[LabelType(type_=name, |
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value=self.parameter[name]) |
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for name in self.parameter.keys()])])) |
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@property |
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def input_files(self): |
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""" |
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List the input files. |
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- If there's a PAGE-XML for the page, take it (and forget about all |
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other files for that page) |
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- Else if there's only one image, take it (and forget about all other |
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files for that page) |
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- Otherwise raise an error (complaining that only PAGE-XML warrants |
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having multiple images for a single page) |
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(https://github.com/cisocrgroup/ocrd_cis/pull/57#issuecomment-656336593) |
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""" |
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ret = self.workspace.mets.find_files( |
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fileGrp=self.input_file_grp, pageId=self.page_id, mimetype=MIMETYPE_PAGE) |
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if ret: |
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return ret |
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ret = self.workspace.mets.find_files( |
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fileGrp=self.input_file_grp, pageId=self.page_id, mimetype="//image/.*") |
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if self.page_id and len(ret) > 1: |
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raise ValueError("No PAGE-XML %s in fileGrp '%s' but multiple images." % ( |
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"for page '%s'" % self.page_id if self.page_id else '', |
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self.input_file_grp |
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)) |
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return ret |
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OCR-D /
core
