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1
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""" |
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2
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Utility functions to simplify access to data structures. |
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3
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""" |
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4
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import json |
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5
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from functools import wraps |
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6
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from pathlib import Path |
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7
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from frozendict import frozendict |
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8
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import atexit |
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9
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from contextlib import ExitStack |
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10
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11
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# cannot use importlib.resources until we move to 3.9+ forimportlib.resources.files |
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12
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import sys |
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13
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if sys.version_info < (3, 9): |
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14
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import importlib_resources |
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15
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else: |
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16
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import importlib.resources as importlib_resources |
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17
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18
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if sys.version_info < (3, 8): |
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19
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import importlib_metadata |
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20
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else: |
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21
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import importlib.metadata as importlib_metadata |
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22
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23
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file_manager = ExitStack() |
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24
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atexit.register(file_manager.close) |
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25
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26
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# Taken from https://github.com/OCR-D/core/pull/884 |
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27
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def freeze_args(func): |
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28
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""" |
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29
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Transform mutable dictionary into immutable. Useful to be compatible with cache. |
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30
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Code taken from `this post <https://stackoverflow.com/a/53394430/1814420>`_ |
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31
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""" |
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32
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@wraps(func) |
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33
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def wrapped(*args, **kwargs): |
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34
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args = tuple([frozendict(arg) if isinstance(arg, dict) else arg for arg in args]) |
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35
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kwargs = {k: frozendict(v) if isinstance(v, dict) else v for k, v in kwargs.items()} |
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36
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return func(*args, **kwargs) |
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37
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return wrapped |
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38
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39
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40
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def membername(class_, val): |
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41
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"""Convert a member variable/constant into a member name string.""" |
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42
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return next((k for k, v in class_.__dict__.items() if v == val), str(val)) |
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43
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44
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def set_json_key_value_overrides(obj, *kvpairs): |
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45
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for kv in kvpairs: |
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46
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k, v = kv |
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47
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try: |
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48
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obj[k] = json.loads(v) |
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49
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except json.decoder.JSONDecodeError: |
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50
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obj[k] = v |
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51
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return obj |
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52
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53
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def resource_filename(pkg : str, fname : str) -> Path: |
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54
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ref = importlib_resources.files(pkg) / fname |
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55
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return file_manager.enter_context(importlib_resources.as_file(ref)) |
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56
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57
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def resource_string(pkg : str, fname : str) -> str: |
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58
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with open(resource_filename(pkg, fname), 'r', encoding='utf-8') as f: |
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59
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return f.read() |
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60
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61
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def dist_version(module : str) -> str: |
|
62
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return importlib_metadata.version(module) |
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63
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OCR-D /
core
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