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Added back from_file method to LlamaGrammar #1673

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Merged
merged 1 commit into from
Aug 12, 2024
Merged

Added back from_file method to LlamaGrammar #1673

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18 changes: 18 additions & 0 deletions llama_cpp/llama_grammar.py
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Original file line number Diff line number Diff line change
@@ -1,6 +1,7 @@
"""Python implementation of llama grammar parser directly translated from C++ source file in vendor/llama.cpp/common/grammar-parser.cpp."""

# flake8: noqa
from pathlib import Path
import sys
import ctypes
import enum
Expand Down Expand Up @@ -893,6 +894,23 @@ def from_string(cls, grammar: str, verbose: bool = True) -> "LlamaGrammar":
if verbose:
print_grammar(file=sys.stdout, state=parsed_grammar)
return cls(parsed_grammar)

@classmethod
def from_file(cls, file: Union[str, Path], verbose: bool = True) -> "LlamaGrammar":
try:
with open(file) as f:
grammar = f.read()
except Exception as err:
raise Exception(
f"{cls.from_file.__name__}: error reading grammar file: {err}"
)

if grammar:
return cls.from_string(grammar, verbose=verbose)

raise ValueError(
f"{cls.from_file.__name__}: error parsing grammar file: params_grammer is empty"
)

@classmethod
def from_json_schema(cls, json_schema: str, verbose: bool = True) -> "LlamaGrammar":
Expand Down