Support TDL :config environments

CHANGELOG.md

@@ -2,6 +2,11 @@
 
 ### Unreleased
 
+### Added
+
+* `delphin.tdl.ConfigEntry` ([#391])
+* `delphin.tdl.ConfigEnvironment` ([#391])
+
 ### Maintenance
 
 * Removed `requirements.txt`; it was unnecessary and out of date
@@ -49,6 +54,11 @@
 * `tdl.AVM` initialization uses `AVM.aggregate()` instead of
   assignment of values on features ([#395])
 
+### Maintenance
+
+* Changed `delphin.tdl` from a simple module to a backwards-compatible
+  package
+
 
 ## [v1.9.1]
 
@@ -1696,6 +1706,7 @@ information about changes, except for
 [#379]: https://github.com/delph-in/pydelphin/issues/379
 [#383]: https://github.com/delph-in/pydelphin/issues/383
 [#386]: https://github.com/delph-in/pydelphin/issues/386
+[#391]: https://github.com/delph-in/pydelphin/issues/391
 [#395]: https://github.com/delph-in/pydelphin/issues/395
 [#396]: https://github.com/delph-in/pydelphin/issues/396
 [#402]: https://github.com/delph-in/pydelphin/issues/402

delphin/tdl/__init__.py

@@ -0,0 +1,75 @@
+__all__ = [
+    'AVM',
+    'DIFF_LIST_LAST',
+    'DIFF_LIST_LIST',
+    'EMPTY_LIST_TYPE',
+    'LIST_HEAD',
+    'LIST_TAIL',
+    'LIST_TYPE',
+    'BlockComment',
+    'ConfigEntry',
+    'ConfigEnvironment',
+    'Conjunction',
+    'ConsList',
+    'Coreference',
+    'DiffList',
+    'FileInclude',
+    'InstanceEnvironment',
+    'LetterSet',
+    'LexicalRuleDefinition',
+    'LineComment',
+    'Regex',
+    'String',
+    'TDLError',
+    'TDLSyntaxError',
+    'TDLWarning',
+    'Term',
+    'TypeAddendum',
+    'TypeDefinition',
+    'TypeEnvironment',
+    'TypeIdentifier',
+    'WildCard',
+    # '_Environment',
+    # '_MorphSet',
+    'format',
+    'iterparse',
+]
+
+from delphin.tdl._exceptions import (
+    TDLError,
+    TDLSyntaxError,
+    TDLWarning,
+)
+from delphin.tdl._format import format
+from delphin.tdl._model import (
+    AVM,
+    DIFF_LIST_LAST,
+    DIFF_LIST_LIST,
+    EMPTY_LIST_TYPE,
+    LIST_HEAD,
+    LIST_TAIL,
+    LIST_TYPE,
+    BlockComment,
+    ConfigEntry,
+    ConfigEnvironment,
+    Conjunction,
+    ConsList,
+    Coreference,
+    DiffList,
+    FileInclude,
+    InstanceEnvironment,
+    LetterSet,
+    LexicalRuleDefinition,
+    LineComment,
+    Regex,
+    String,
+    Term,
+    TypeAddendum,
+    TypeDefinition,
+    TypeEnvironment,
+    TypeIdentifier,
+    WildCard,
+    # _Environment,
+    # _MorphSet,
+)
+from delphin.tdl._parse import iterparse  # parse, decode

delphin/tdl/_exceptions.py

@@ -0,0 +1,17 @@
+from delphin.exceptions import (
+    PyDelphinException,
+    PyDelphinSyntaxError,
+    PyDelphinWarning,
+)
+
+
+class TDLError(PyDelphinException):
+    """Raised when there is an error in processing TDL."""
+
+
+class TDLSyntaxError(PyDelphinSyntaxError):
+    """Raised when parsing TDL text fails."""
+
+
+class TDLWarning(PyDelphinWarning):
+    """Raised when parsing unsupported TDL features."""