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utils.py

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+import typing as T
+
+from conllu.exceptions import ParseException
+from conllu.models import Metadata, TokenList
+from conllu.parser import (DEFAULT_FIELD_PARSERS, DEFAULT_FIELDS,
+                           _FieldParserType, _MetadataParserType,
+                           parse_comment_line, parse_line)
+
+imputed_sent_id: int = 1
+
+
+def parse_token_and_impute_metadata(data: str, fields: T.Optional[T.Sequence[str]] = None, field_parsers: T.Optional[T.Dict[str, _FieldParserType]] = None, metadata_parsers: T.Optional[T.Dict[str, _MetadataParserType]] = None) -> TokenList:
+    """
+    Overrides conllu.parse_token_and_metadata via monkey patching.
+    This function imputes the following metadata, if these are not found in the .conllu file:
+        - sent_id (int): an integer identifier for each sentence.
+        - text (str): a concatenated string of token forms. This assumes that all token forms
+        are separated with an empty space ' ', and does not consider the `SpaceAfter` field.
+    """
+
+    if not data:
+        raise ParseException("Can't create TokenList, no data sent to constructor.")
+
+    fields = fields or DEFAULT_FIELDS
+    global imputed_sent_id
+
+    if not field_parsers:
+        field_parsers = DEFAULT_FIELD_PARSERS.copy()
+    elif sorted(field_parsers.keys()) != sorted(fields):
+        new_field_parsers = DEFAULT_FIELD_PARSERS.copy()
+        new_field_parsers.update(field_parsers)
+        field_parsers = new_field_parsers
+
+    tokens = []
+    metadata = Metadata()
+
+    for line in data.split('\n'):
+        line = line.strip()
+
+        if not line:
+            continue
+
+        if line.startswith('#'):
+            pairs = parse_comment_line(line, metadata_parsers=metadata_parsers)
+            for key, value in pairs:
+                metadata[key] = value
+
+        else:
+            tokens.append(parse_line(line, fields, field_parsers))
+
+    if 'sent_id' not in metadata:
+        metadata['sent_id'] = str(imputed_sent_id)
+        imputed_sent_id += 1
+
+    if 'text' not in metadata:
+        imputed_text = ""
+        for token in tokens:
+            imputed_text += str(token['form']) + " "
+        metadata['text'] = imputed_text
+
+    return TokenList(tokens, metadata, default_fields=fields)