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Implemented WIP grammar import memoization #152

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Implemented WIP grammar import memoization #152

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9 changes: 7 additions & 2 deletions parglare/grammar.py
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Original file line number Diff line number Diff line change
Expand Up @@ -425,6 +425,7 @@ class GrammarContext:
ignore_case: bool = False
imported_with: Optional['PGFileImport'] = None
inline_terminals: Dict = field(default_factory=dict)
imports: dict[str, 'PGFileImport'] = field(default_factory=dict)


class PGFile:
Expand Down Expand Up @@ -1185,14 +1186,18 @@ class PGFileImport:
pgfile (PGFile instance or None):

"""
def __init__(self, module_name: str, file_path: str,
context: GrammarContext):
def __new__(cls, module_name: str, file_path: str,
context: GrammarContext):
if file_path in context.imports:
return context.imports[file_path]
context.imports[file_path] = self = super().__new__(cls)
self.module_name = module_name
self.file_path: str = file_path
self.context = context
self.imported_with: Optional[PGFileImport] = context.imported_with
self.grammar: Optional[Grammar] = None
self.pgfile: Optional[PGFile] = None
return self

@property
def fqn(self):
Expand Down