1536 lines
54 KiB
Python
1536 lines
54 KiB
Python
"""Python implementation of llama grammar parser directly translated from C++ source file in vendor/llama.cpp/common/grammar-parser.cpp."""
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# flake8: noqa
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from pathlib import Path
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import sys
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from ctypes import * # type: ignore
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from enum import Enum
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from itertools import islice
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from typing import (
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Any,
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Callable,
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Dict,
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Generic,
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List,
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Optional,
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OrderedDict,
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TextIO,
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Tuple,
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TypeVar,
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Union,
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overload,
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)
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import llama_cpp.llama_cpp as llama_cpp
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# Type aliases
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llama_grammar_element = llama_cpp.llama_grammar_element
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llama_grammar_element_p = llama_cpp.llama_grammar_element_p
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llama_grammar_p = llama_cpp.llama_grammar_p
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# Type variables
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Ptr = TypeVar("Ptr", bound="const_char_p")
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T = TypeVar("T")
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U = TypeVar("U")
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V = TypeVar("V")
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W = TypeVar("W")
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class Sentinel:
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"""Used to mark the end of a iterator of std::vector & std::map."""
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class LlamaGrammar:
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"""Keeps reference counts of all the arguments, so that they are not
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garbage collected by Python."""
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def __del__(self) -> None:
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"""Free the grammar pointer when the object is deleted."""
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if self.grammar is not None:
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llama_cpp.llama_grammar_free(self.grammar)
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self.grammar = None
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def __init__(
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self,
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parsed_grammar: "parse_state",
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) -> None:
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"""Initialize the grammar pointer from the parsed state."""
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self._grammar_rules = (
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parsed_grammar.c_rules()
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) # type: std.vector[std.vector[LlamaGrammarElement]]
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self._n_rules = self._grammar_rules.size() # type: int
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self._start_rule_index = parsed_grammar.symbol_ids.at("root") # type: int
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self.init()
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@classmethod
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def from_string(cls, grammar: str, verbose: bool = True) -> "LlamaGrammar":
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"""Convert a GBNF grammar to a Llama grammar."""
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parsed_grammar = parse(const_char_p(grammar)) # type: parse_state
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if parsed_grammar.rules.empty():
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raise ValueError(
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f"{cls.from_string.__name__}: error parsing grammar file: parsed_grammar.rules is empty"
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)
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if verbose:
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print(f"{cls.from_string.__name__} grammar:", file=sys.stderr)
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print_grammar(sys.stderr, parsed_grammar)
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print(file=sys.stderr)
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return cls(parsed_grammar)
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@classmethod
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def from_json_schema(
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cls,
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json_schema: str,
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verbose: bool = True,
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) -> "LlamaGrammar":
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"""Convert a JSON schema to a Llama grammar."""
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return cls.from_string(json_schema_to_gbnf(json_schema), verbose=verbose)
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@classmethod
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def from_file(cls, file: Union[str, Path], verbose: bool = True) -> "LlamaGrammar":
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try:
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with open(file) as f:
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grammar = f.read()
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except Exception as err:
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raise Exception(
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f"{cls.from_file.__name__}: error reading grammar file: {err}"
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)
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if grammar:
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return cls.from_string(grammar, verbose=verbose)
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raise ValueError(
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f"{cls.from_file.__name__}: error parsing grammar file: params_grammer is empty"
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)
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def init(self) -> None:
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# Step 1: Convert LlamaGrammarElement to llama_grammar_element
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self._element_lists = [
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[
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llama_grammar_element(c_int(elem.type.value), c_uint32(elem.value))
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for elem in subvector
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]
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for subvector in self._grammar_rules
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] # type: List[List[llama_grammar_element]]
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# Step 2: Convert each list to llama_grammar_element array and get pointer
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self._element_arrays = [
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(llama_grammar_element * len(sublist))(*sublist)
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for sublist in self._element_lists
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] # type: List[Array[llama_grammar_element]]
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# Step 3: Get pointer of each array
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self._element_array_pointers = [
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cast(subarray, llama_grammar_element_p) for subarray in self._element_arrays
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] # type: List[llama_grammar_element_p]
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# Step 4: Make array of these pointers and get its pointer
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self._rules = (llama_grammar_element_p * len(self._element_array_pointers))(
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*self._element_array_pointers
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)
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self.grammar = llama_cpp.llama_grammar_init(
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self._rules, c_size_t(self._n_rules), c_size_t(self._start_rule_index)
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)
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def reset(self) -> None:
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if self.grammar is not None:
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llama_cpp.llama_grammar_free(self.grammar)
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self.init()
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class LlamaGrammarElement:
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def __init__(self, type: "llama_gretype", value: int):
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self.type = type
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self.value = value # Unicode code point or rule ID
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class const_char_p:
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"""C++ implementation of const char *."""
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def __init__(self, value: Union[str, Ptr], move: Optional[int] = None):
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if isinstance(value, const_char_p):
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# We're copying an existing const_char_p
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self.value = value.value
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self.pos = value.pos + (move or 0)
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return
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# We're creating a new const_char_p
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self.value = value
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self.pos = move or 0
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def __str__(self) -> str:
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assert self.value is not None, "null pointer"
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return self.value[self.pos :]
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def __getitem__(self, index: int) -> str:
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value = str(self)
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return value[index] if index < len(value) else ""
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@overload
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def __add__(self: Ptr, other: int) -> Ptr:
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...
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@overload
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def __add__(self: Ptr, other: Ptr) -> int:
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...
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def __add__(self: Ptr, other: Union[int, Ptr]) -> Union[int, Ptr]:
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return (
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self.__class__(self.value, self.pos + other)
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if isinstance(other, int)
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else self.pos + other.pos
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)
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@overload
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def __sub__(self: Ptr, other: int) -> Ptr:
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...
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@overload
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def __sub__(self: Ptr, other: Ptr) -> int:
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...
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def __sub__(self: Ptr, other: Union[int, Ptr]) -> Union[int, Ptr]:
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return (
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self.__class__(self.value, self.pos - other)
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if isinstance(other, int)
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else self.pos - other.pos
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)
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def __eq__(self: Ptr, other: Ptr) -> bool:
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assert self.value == other.value, "comparing pointers from different strings"
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return self.pos == other.pos
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def __lt__(self: Ptr, other: Ptr) -> bool:
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assert self.value == other.value, "comparing pointers from different strings"
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return self.pos < other.pos
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def __gt__(self: Ptr, other: Ptr) -> bool:
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assert self.value == other.value, "comparing pointers from different strings"
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return self.pos > other.pos
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class std:
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@staticmethod
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def string(ptr: const_char_p, length: Optional[int] = None) -> str:
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"""C++ implementation of std::string constructor."""
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value = str(ptr)
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if length is not None:
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value = value[:length]
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return value
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class vector(Generic[T], List[T]):
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"""C++ implementation of std::vector."""
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class iterator:
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def __init__(self, vector: "std.vector[T]", index: int):
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self._vector = vector
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self._index = index
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self._version = vector._version
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def _check_version(self):
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if self._version != self._vector._version:
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raise RuntimeError("Iterator used after vector was modified.")
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def __iter__(self):
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return self
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def __next__(self) -> T:
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self._check_version()
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if self._index >= self._vector.size():
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raise StopIteration
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value = self._vector[self._index]
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self._index += 1
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return value
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def __add__(self, value: int) -> "std.vector[T].iterator":
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return self.__class__(self._vector, self._index + value)
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def __sub__(self, value: int) -> "std.vector[T].iterator":
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return self.__class__(self._vector, self._index - value)
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def __init__(self):
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self._version = 0
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def modify(self):
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# This is a bit of a hack to make sure iterators are invalidated
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self._version += 1
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def push_back(self, value: T) -> None:
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self.modify()
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self.append(value)
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def pop_back(self) -> None:
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self.modify()
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if not self.empty():
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self.pop()
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def back(self) -> T:
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return self[-1]
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def size(self) -> int:
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return len(self)
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def clear(self) -> None:
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self.modify()
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super().clear()
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def empty(self) -> bool:
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return self.size() == 0
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def data(self) -> "std.vector[T]":
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return self
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def resize(
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self,
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new_size: int,
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fill_value_factory: Optional[Callable[[], T]] = None,
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) -> None:
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if new_size > self.size():
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if fill_value_factory is None:
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raise ValueError("A fill value factory function must be provided.")
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self.reserve(new_size, fill_value_factory)
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elif new_size < self.size():
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self[:] = self[:new_size]
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def reserve(self, capacity: int, fill_value_factory: Callable[[], T]) -> None:
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if capacity > self.size():
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fill_value = fill_value_factory()
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self.extend([fill_value] * (capacity - self.size()))
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def front(self) -> T:
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if not self.empty():
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return self[0]
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else:
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raise IndexError("Vector is empty.")
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def assign(self, count: int, value: T) -> None:
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self.clear()
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self.extend([value] * count)
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def insert(
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self,
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pos: "std.vector[T].iterator",
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first: "std.vector[T].iterator",
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last: "std.vector[T].iterator",
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) -> None:
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self[pos._index : pos._index] = list(
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islice(first._vector, first._index, last._index)
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)
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def begin(self) -> "std.vector[T].iterator":
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return self.iterator(self, 0)
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def end(self) -> "std.vector[T].iterator":
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return self.iterator(self, self.size())
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class map(Generic[T, U], OrderedDict[T, U]):
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"""C++ implementation of std::map."""
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class iterator(Generic[V, W]):
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def __init__(self, _map: "std.map[T, U]", key: Union[T, Sentinel]):
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self._map = _map
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self.iter = iter(_map)
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self.key = key
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self._advance()
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def _sanitize_key(self) -> T:
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if isinstance(self.key, Sentinel):
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raise StopIteration
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return self.key
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def _advance(self) -> None:
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try:
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while next(self.iter) != self.key:
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pass
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except StopIteration:
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self.key = Sentinel()
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def __next__(self) -> Tuple[T, U]:
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key = self._sanitize_key()
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if key in self._map:
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value = self._map[key]
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self._advance()
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return key, value
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else:
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raise StopIteration
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def get(self) -> Tuple[T, U]:
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key = self._sanitize_key()
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return key, self._map[key]
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@property
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def first(self) -> T:
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return self._sanitize_key()
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@property
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def second(self) -> U:
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return self._map[self._sanitize_key()]
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def insert(
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self, key: T, value: U
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) -> Tuple["std.map[T, U].iterator[T, U]", bool]:
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if key in self:
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return self.iterator(self, key), False
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else:
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self[key] = value
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return self.iterator(self, key), True
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def find(self, key: T) -> "std.map[T, U].iterator[T, U]":
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if key in self:
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return self.iterator(self, key)
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else:
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return self.end()
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def at(self, key: T) -> U:
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if key in self:
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return self[key]
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else:
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raise KeyError("The provided key is not found in the map.")
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def erase(self, iterator: "std.map[T, U].iterator[T, U]") -> None:
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key = iterator.first
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if key in self:
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del self[key]
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def size(self) -> int:
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return len(self)
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def empty(self) -> bool:
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return self.size() == 0
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def lower_bound(self, key: T) -> "std.map[T, U].iterator[T, U]":
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try:
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keys = sorted(list(self.keys())) # type: ignore
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for k in keys:
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if k >= key:
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return self.iterator(self, k)
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raise ValueError("No key found that is not less than the input key")
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except TypeError:
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raise TypeError("Keys of type T cannot be sorted.")
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def begin(self) -> "std.map[T, U].iterator[T, U]":
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return self.iterator(self, next(iter(self)))
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def end(self) -> "std.map[T, U].iterator[T, U]":
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return self.iterator(self, Sentinel())
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# // grammar element type
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# enum llama_gretype {
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# // end of rule definition
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# LLAMA_GRETYPE_END = 0,
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# // start of alternate definition for rule
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# LLAMA_GRETYPE_ALT = 1,
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# // non-terminal element: reference to rule
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# LLAMA_GRETYPE_RULE_REF = 2,
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# // terminal element: character (code point)
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# LLAMA_GRETYPE_CHAR = 3,
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# // inverse char(s) ([^a], [^a-b] [^abc])
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# LLAMA_GRETYPE_CHAR_NOT = 4,
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# // modifies a preceding LLAMA_GRETYPE_CHAR or LLAMA_GRETYPE_CHAR_ALT to
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# // be an inclusive range ([a-z])
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# LLAMA_GRETYPE_CHAR_RNG_UPPER = 5,
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# // modifies a preceding LLAMA_GRETYPE_CHAR or
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# // LLAMA_GRETYPE_CHAR_RNG_UPPER to add an alternate char to match ([ab], [a-zA])
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# LLAMA_GRETYPE_CHAR_ALT = 6,
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# };
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class llama_gretype(Enum):
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"""grammar element type"""
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LLAMA_GRETYPE_END = 0 # end of rule definition
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LLAMA_GRETYPE_ALT = 1 # start of alternate definition for rule
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LLAMA_GRETYPE_RULE_REF = 2 # non-terminal element: reference to rule
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LLAMA_GRETYPE_CHAR = 3 # terminal element: character (code point)
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LLAMA_GRETYPE_CHAR_NOT = 4 # inverse char(s) ([^a], [^a-b] [^abc])
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LLAMA_GRETYPE_CHAR_RNG_UPPER = 5 # modifies a preceding LLAMA_GRETYPE_CHAR or LLAMA_GRETYPE_CHAR_ALT to be an inclusive range ([a-z])
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LLAMA_GRETYPE_CHAR_ALT = 6 # modifies a preceding LLAMA_GRETYPE_CHAR or LLAMA_GRETYPE_CHAR_RNG_UPPER to add an alternate char to match ([ab], [a-zA])
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# struct parse_state {
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# std::map<std::string, uint32_t> symbol_ids;
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# std::vector<std::vector<llama_grammar_element>> rules;
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# std::vector<const llama_grammar_element *> c_rules();
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# };
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class parse_state:
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def __init__(self):
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self.symbol_ids: std.map[str, int] = std.map()
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self.rules: std.vector[std.vector[LlamaGrammarElement]] = std.vector()
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|
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# std::vector<const llama_grammar_element *> parse_state::c_rules() {
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# std::vector<const llama_grammar_element *> ret;
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# for (const auto & rule : rules) {
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# ret.push_back(rule.data());
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# }
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# return ret;
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# }
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def c_rules(self) -> std.vector[std.vector[LlamaGrammarElement]]:
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ret = std.vector() # type: std.vector[std.vector[LlamaGrammarElement]]
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for rule in self.rules:
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ret.push_back(rule.data())
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return ret
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|
|
def __repr__(self) -> str:
|
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return (
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f"parse_state(symbol_ids={len(self.symbol_ids)}, rules={len(self.rules)})"
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)
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|
|
|
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# struct llama_grammar {
|
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# const std::vector<std::vector<llama_grammar_element>> rules;
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# std::vector<std::vector<const llama_grammar_element *>> stacks;
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# };
|
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# class llama_grammar:
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# def __init__(
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# self,
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# rules: std.vector[std.vector[llama_grammar_element]],
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# stacks: std.vector[std.vector[llama_grammar_element]],
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# ):
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# self.rules = rules
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# self.stacks = stacks
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|
|
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# uint32_t get_symbol_id(parse_state & state, const char * src, size_t len) {
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# uint32_t next_id = static_cast<uint32_t>(state.symbol_ids.size());
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# auto result = state.symbol_ids.insert(std::make_pair(std::string(src, len), next_id));
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# return result.first->second;
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# }
|
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def get_symbol_id(state: parse_state, src: const_char_p, len: int) -> int:
|
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next_id = state.symbol_ids.size() # type: int
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result = state.symbol_ids.insert(std.string(src, len), next_id)
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return result[0].second # type: ignore
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|
|
|
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# uint32_t generate_symbol_id(parse_state & state, const std::string & base_name) {
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# uint32_t next_id = static_cast<uint32_t>(state.symbol_ids.size());
|
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# state.symbol_ids[base_name + '_' + std::to_string(next_id)] = next_id;
|
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# return next_id;
|
|
# }
|
|
def generate_symbol_id(state: parse_state, base_name: str) -> int:
|
|
next_id = state.symbol_ids.size() # type: int
|
|
state.symbol_ids[base_name + "_" + str(next_id)] = next_id
|
|
return next_id
|
|
|
|
|
|
# void add_rule(
|
|
# parse_state & state,
|
|
# uint32_t rule_id,
|
|
# const std::vector<llama_grammar_element> & rule) {
|
|
# if (state.rules.size() <= rule_id) {
|
|
# state.rules.resize(rule_id + 1);
|
|
# }
|
|
# state.rules[rule_id] = rule;
|
|
# }
|
|
def add_rule(
|
|
state: parse_state,
|
|
rule_id: int,
|
|
rule: std.vector[LlamaGrammarElement],
|
|
) -> None:
|
|
if state.rules.size() <= rule_id:
|
|
state.rules.resize(
|
|
rule_id + 1,
|
|
fill_value_factory=std.vector[LlamaGrammarElement],
|
|
)
|
|
state.rules[rule_id] = rule
|
|
|
|
|
|
# std::pair<uint32_t, const char *> decode_utf8(const char * src) {
|
|
# static const int lookup[] = { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 3, 4 };
|
|
# uint8_t first_byte = static_cast<uint8_t>(*src);
|
|
# uint8_t highbits = first_byte >> 4;
|
|
# int len = lookup[highbits];
|
|
# uint8_t mask = (1 << (8 - len)) - 1;
|
|
# uint32_t value = first_byte & mask;
|
|
# const char * end = src + len; // may overrun!
|
|
# const char * pos = src + 1;
|
|
# for ( ; pos < end && *pos; pos++) {
|
|
# value = (value << 6) + (static_cast<uint8_t>(*pos) & 0x3F);
|
|
# }
|
|
# return std::make_pair(value, pos);
|
|
# }
|
|
def decode_utf8(src: const_char_p) -> Tuple[int, const_char_p]:
|
|
"""Decodes a UTF-8 character from the source string."""
|
|
lookup = (1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 3, 4)
|
|
first_byte = ord(src[0]) # type: int
|
|
highbits = first_byte >> 4 # type: int
|
|
len = lookup[highbits] # type: int
|
|
mask = (1 << (8 - len)) - 1 # type: int
|
|
value = first_byte & mask # type: int
|
|
end = src + len # type: const_char_p # may overrun!
|
|
pos = src + 1 # type: const_char_p
|
|
while pos < end and pos[0]:
|
|
value = (value << 6) + (ord(pos[0]) & 0x3F)
|
|
pos += 1
|
|
return value, pos
|
|
|
|
|
|
# bool is_word_char(char c) {
|
|
# return ('a' <= c && c <= 'z') || ('A' <= c && c <= 'Z') || c == '-' || ('0' <= c && c <= '9');
|
|
# }
|
|
def is_word_char(c: str) -> bool:
|
|
return ("a" <= c <= "z") or ("A" <= c <= "Z") or c == "-" or ("0" <= c <= "9")
|
|
|
|
|
|
# std::pair<uint32_t, const char *> parse_hex(const char * src, int size) {
|
|
# const char * pos = src;
|
|
# const char * end = src + size;
|
|
# uint32_t value = 0;
|
|
# for ( ; pos < end && *pos; pos++) {
|
|
# value <<= 4;
|
|
# char c = *pos;
|
|
# if ('a' <= c && c <= 'f') {
|
|
# value += c - 'a' + 10;
|
|
# } else if ('A' <= c && c <= 'F') {
|
|
# value += c - 'A' + 10;
|
|
# } else if ('0' <= c && c <= '9') {
|
|
# value += c - '0';
|
|
# } else {
|
|
# break;
|
|
# }
|
|
# }
|
|
# if (pos != end) {
|
|
# throw std::runtime_error("expecting " + std::to_string(size) + " hex chars at " + src);
|
|
# }
|
|
# return std::make_pair(value, pos);
|
|
# }
|
|
def parse_hex(src: const_char_p, size: int) -> Tuple[int, const_char_p]:
|
|
pos = const_char_p(src) # type: const_char_p
|
|
end = src + size # type: const_char_p
|
|
value = 0 # type: int
|
|
while pos < end and pos[0]:
|
|
value <<= 4
|
|
c = pos[0] # type: str
|
|
if "a" <= c <= "f":
|
|
value += ord(c) - ord("a") + 10
|
|
elif "A" <= c <= "F":
|
|
value += ord(c) - ord("A") + 10
|
|
elif "0" <= c <= "9":
|
|
value += ord(c) - ord("0")
|
|
else:
|
|
break
|
|
pos += 1
|
|
if pos != end:
|
|
raise RuntimeError("expecting " + str(size) + " hex chars at " + str(src))
|
|
return (value, pos)
|
|
|
|
|
|
# std::pair<uint32_t, const char *> parse_char(const char * src) {
|
|
# if (*src == '\\') {
|
|
# switch (src[1]) {
|
|
# case 'x': return parse_hex(src + 2, 2);
|
|
# case 'u': return parse_hex(src + 2, 4);
|
|
# case 'U': return parse_hex(src + 2, 8);
|
|
# case 't': return std::make_pair('\t', src + 2);
|
|
# case 'r': return std::make_pair('\r', src + 2);
|
|
# case 'n': return std::make_pair('\n', src + 2);
|
|
# case '\\':
|
|
# case '"':
|
|
# case '[':
|
|
# case ']':
|
|
# return std::make_pair(src[1], src + 2);
|
|
# default:
|
|
# throw std::runtime_error(std::string("unknown escape at ") + src);
|
|
# }
|
|
# } else if (*src) {
|
|
# return decode_utf8(src);
|
|
# }
|
|
# throw std::runtime_error("unexpected end of input");
|
|
# }
|
|
def parse_char(src: const_char_p) -> Tuple[int, const_char_p]:
|
|
if src[0] == "\\":
|
|
case = src[1] # type: str
|
|
if case == "x":
|
|
return parse_hex(src + 2, 2)
|
|
elif case == "u":
|
|
return parse_hex(src + 2, 4)
|
|
elif case == "U":
|
|
return parse_hex(src + 2, 8)
|
|
elif case == "t":
|
|
return (ord("\t"), src + 2) # implicit cast
|
|
elif case == "r":
|
|
return (ord("\r"), src + 2) # implicit cast
|
|
elif case == "n":
|
|
return (ord("\n"), src + 2) # implicit cast
|
|
elif case in ("\\", '"', "[", "]"):
|
|
return (ord(case), src + 2) # implicit cast
|
|
else:
|
|
raise RuntimeError("unknown escape at " + str(src))
|
|
elif src[0]:
|
|
return decode_utf8(src)
|
|
else:
|
|
raise RuntimeError("unexpected end of input")
|
|
|
|
|
|
# const char * parse_name(const char * src) {
|
|
# const char * pos = src;
|
|
# while (is_word_char(*pos)) {
|
|
# pos++;
|
|
# }
|
|
# if (pos == src) {
|
|
# throw std::runtime_error(std::string("expecting name at ") + src);
|
|
# }
|
|
# return pos;
|
|
# }
|
|
def parse_name(src: const_char_p) -> const_char_p:
|
|
pos = const_char_p(src) # type: const_char_p
|
|
while is_word_char(pos[0]):
|
|
pos += 1
|
|
if pos == src:
|
|
raise RuntimeError("expecting name at " + str(src))
|
|
return pos
|
|
|
|
|
|
# const char * parse_space(const char * src, bool newline_ok) {
|
|
# const char * pos = src;
|
|
# while (*pos == ' ' || *pos == '\t' || *pos == '#' ||
|
|
# (newline_ok && (*pos == '\r' || *pos == '\n'))) {
|
|
# if (*pos == '#') {
|
|
# while (*pos && *pos != '\r' && *pos != '\n') {
|
|
# pos++;
|
|
# }
|
|
# } else {
|
|
# pos++;
|
|
# }
|
|
# }
|
|
# return pos;
|
|
# }
|
|
def parse_space(src: const_char_p, newline_ok: bool) -> const_char_p:
|
|
pos = const_char_p(src) # type: const_char_p
|
|
while pos[0] in (" ", "\t", "#") or (newline_ok and pos[0] in ("\r", "\n")):
|
|
if pos[0] == "#":
|
|
while pos[0] is not None and pos[0] not in ("\r", "\n"):
|
|
pos += 1
|
|
else:
|
|
pos += 1
|
|
return pos
|
|
|
|
|
|
# const char * parse_sequence(
|
|
# parse_state & state,
|
|
# const char * src,
|
|
# const std::string & rule_name,
|
|
# std::vector<llama_grammar_element> & out_elements,
|
|
# bool is_nested) {
|
|
def parse_sequence(
|
|
state: parse_state,
|
|
src: const_char_p,
|
|
rule_name: str,
|
|
out_elements: std.vector[LlamaGrammarElement],
|
|
is_nested: bool,
|
|
) -> const_char_p:
|
|
# size_t last_sym_start = out_elements.size();
|
|
# const char * pos = src;
|
|
last_sym_start = out_elements.size() # type: int
|
|
pos = const_char_p(src) # type: const_char_p
|
|
# while (*pos) {
|
|
while pos[0]:
|
|
# if (*pos == '"') { // literal string
|
|
# pos++;
|
|
# last_sym_start = out_elements.size();
|
|
# while (*pos != '"') {
|
|
# auto char_pair = parse_char(pos);
|
|
# pos = char_pair.second;
|
|
# out_elements.push_back({LLAMA_GRETYPE_CHAR, char_pair.first});
|
|
# }
|
|
# pos = parse_space(pos + 1, is_nested);
|
|
if pos[0] == '"': # literal string
|
|
pos += 1
|
|
last_sym_start = out_elements.size()
|
|
while pos[0] != '"':
|
|
char_pair = parse_char(pos) # type: Tuple[int, const_char_p]
|
|
pos = char_pair[1]
|
|
out_elements.push_back(
|
|
LlamaGrammarElement(llama_gretype.LLAMA_GRETYPE_CHAR, char_pair[0])
|
|
)
|
|
pos = parse_space(pos + 1, is_nested)
|
|
# } else if (*pos == '[') { // char range(s)
|
|
# pos++;
|
|
# enum llama_gretype start_type = LLAMA_GRETYPE_CHAR;
|
|
elif pos[0] == "[": # char range(s)
|
|
pos += 1
|
|
start_type = llama_gretype.LLAMA_GRETYPE_CHAR # type: llama_gretype
|
|
# if (*pos == '^') {
|
|
# pos++;
|
|
# start_type = LLAMA_GRETYPE_CHAR_NOT;
|
|
# }
|
|
# last_sym_start = out_elements.size();
|
|
if pos[0] == "^":
|
|
pos += 1
|
|
start_type = llama_gretype.LLAMA_GRETYPE_CHAR_NOT
|
|
last_sym_start = out_elements.size()
|
|
# while (*pos != ']') {
|
|
# auto char_pair = parse_char(pos);
|
|
# pos = char_pair.second;
|
|
# enum llama_gretype type = last_sym_start < out_elements.size()
|
|
# ? LLAMA_GRETYPE_CHAR_ALT
|
|
# : start_type;
|
|
# out_elements.push_back({type, char_pair.first});
|
|
while pos[0] != "]":
|
|
char_pair = parse_char(pos) # type: Tuple[int, const_char_p]
|
|
pos = char_pair[1]
|
|
type = (
|
|
llama_gretype.LLAMA_GRETYPE_CHAR_ALT
|
|
if last_sym_start < out_elements.size()
|
|
else start_type
|
|
) # type: llama_gretype
|
|
out_elements.push_back(LlamaGrammarElement(type, char_pair[0]))
|
|
# if (pos[0] == '-' && pos[1] != ']') {
|
|
# auto endchar_pair = parse_char(pos + 1);
|
|
# pos = endchar_pair.second;
|
|
# out_elements.push_back({LLAMA_GRETYPE_CHAR_RNG_UPPER, endchar_pair.first});
|
|
# }
|
|
# }
|
|
if pos[0] == "-" and pos[1] != "]":
|
|
endchar_pair = parse_char(pos + 1) # type: Tuple[int, const_char_p]
|
|
pos = endchar_pair[1]
|
|
out_elements.push_back(
|
|
LlamaGrammarElement(
|
|
llama_gretype.LLAMA_GRETYPE_CHAR_RNG_UPPER,
|
|
endchar_pair[0],
|
|
)
|
|
)
|
|
# pos = parse_space(pos + 1, is_nested);
|
|
pos = parse_space(pos + 1, is_nested)
|
|
# } else if (is_word_char(*pos)) { // rule reference
|
|
# const char * name_end = parse_name(pos);
|
|
# uint32_t ref_rule_id = get_symbol_id(state, pos, name_end - pos);
|
|
# pos = parse_space(name_end, is_nested);
|
|
# last_sym_start = out_elements.size();
|
|
# out_elements.push_back({LLAMA_GRETYPE_RULE_REF, ref_rule_id});
|
|
elif is_word_char(pos[0]): # rule reference
|
|
name_end = parse_name(pos) # type: const_char_p
|
|
ref_rule_id = get_symbol_id(state, pos, name_end - pos) # type: int
|
|
pos = parse_space(name_end, is_nested)
|
|
last_sym_start = out_elements.size()
|
|
out_elements.push_back(
|
|
LlamaGrammarElement(llama_gretype.LLAMA_GRETYPE_RULE_REF, ref_rule_id)
|
|
)
|
|
# } else if (*pos == '(') { // grouping
|
|
# // parse nested alternates into synthesized rule
|
|
# pos = parse_space(pos + 1, true);
|
|
# uint32_t sub_rule_id = generate_symbol_id(state, rule_name);
|
|
# pos = parse_alternates(state, pos, rule_name, sub_rule_id, true);
|
|
# last_sym_start = out_elements.size();
|
|
# // output reference to synthesized rule
|
|
# out_elements.push_back({LLAMA_GRETYPE_RULE_REF, sub_rule_id});
|
|
# if (*pos != ')') {
|
|
# throw std::runtime_error(std::string("expecting ')' at ") + pos);
|
|
# }
|
|
# pos = parse_space(pos + 1, is_nested);
|
|
elif pos[0] == "(": # grouping
|
|
# parse nested alternates into synthesized rule
|
|
pos = parse_space(pos + 1, True)
|
|
sub_rule_id = generate_symbol_id(state, rule_name) # type: int
|
|
pos = parse_alternates(state, pos, rule_name, sub_rule_id, True)
|
|
last_sym_start = out_elements.size()
|
|
# output reference to synthesized rule
|
|
out_elements.push_back(
|
|
LlamaGrammarElement(llama_gretype.LLAMA_GRETYPE_RULE_REF, sub_rule_id)
|
|
)
|
|
if pos[0] != ")":
|
|
raise RuntimeError("expecting ')' at " + str(pos))
|
|
pos = parse_space(pos + 1, is_nested)
|
|
# } else if (*pos == '*' || *pos == '+' || *pos == '?') { // repetition operator
|
|
# if (last_sym_start == out_elements.size()) {
|
|
# throw std::runtime_error(std::string("expecting preceeding item to */+/? at ") + pos);
|
|
# }
|
|
elif pos[0] in ("*", "+", "?"): # repetition operator
|
|
if last_sym_start == out_elements.size():
|
|
raise RuntimeError("expecting preceding item to */+/? at " + str(pos))
|
|
# // apply transformation to previous symbol (last_sym_start to end) according to
|
|
# // rewrite rules:
|
|
# // S* --> S' ::= S S' |
|
|
# // S+ --> S' ::= S S' | S
|
|
# // S? --> S' ::= S |
|
|
# uint32_t sub_rule_id = generate_symbol_id(state, rule_name);
|
|
# std::vector<llama_grammar_element> sub_rule;
|
|
# // add preceding symbol to generated rule
|
|
# sub_rule.insert(
|
|
# sub_rule.end(), out_elements.begin() + last_sym_start, out_elements.end());
|
|
sub_rule_id = generate_symbol_id(state, rule_name) # type: int
|
|
sub_rule = std.vector[
|
|
LlamaGrammarElement
|
|
]() # type: std.vector[LlamaGrammarElement]
|
|
sub_rule.insert(
|
|
sub_rule.end(),
|
|
out_elements.begin() + last_sym_start,
|
|
out_elements.end(),
|
|
)
|
|
# if (*pos == '*' || *pos == '+') {
|
|
# // cause generated rule to recurse
|
|
# sub_rule.push_back({LLAMA_GRETYPE_RULE_REF, sub_rule_id});
|
|
# }
|
|
# // mark start of alternate def
|
|
# sub_rule.push_back({LLAMA_GRETYPE_ALT, 0});
|
|
if pos[0] in ("*", "+"):
|
|
sub_rule.push_back(
|
|
LlamaGrammarElement(
|
|
llama_gretype.LLAMA_GRETYPE_RULE_REF, sub_rule_id
|
|
)
|
|
)
|
|
sub_rule.push_back(LlamaGrammarElement(llama_gretype.LLAMA_GRETYPE_ALT, 0))
|
|
# if (*pos == '+') {
|
|
# // add preceding symbol as alternate only for '+' (otherwise empty)
|
|
# sub_rule.insert(
|
|
# sub_rule.end(), out_elements.begin() + last_sym_start, out_elements.end());
|
|
# }
|
|
# sub_rule.push_back({LLAMA_GRETYPE_END, 0});
|
|
# add_rule(state, sub_rule_id, sub_rule);
|
|
# // in original rule, replace previous symbol with reference to generated rule
|
|
# out_elements.resize(last_sym_start);
|
|
# out_elements.push_back({LLAMA_GRETYPE_RULE_REF, sub_rule_id});
|
|
# pos = parse_space(pos + 1, is_nested);
|
|
if pos[0] == "+":
|
|
# add preceding symbol as alternate only for '+' (otherwise empty)
|
|
sub_rule.insert(
|
|
sub_rule.end(),
|
|
out_elements.begin() + last_sym_start,
|
|
out_elements.end(),
|
|
)
|
|
sub_rule.push_back(LlamaGrammarElement(llama_gretype.LLAMA_GRETYPE_END, 0))
|
|
add_rule(state, sub_rule_id, sub_rule)
|
|
# in original rule, replace previous symbol with reference to generated rule
|
|
out_elements.resize(last_sym_start)
|
|
out_elements.push_back(
|
|
LlamaGrammarElement(llama_gretype.LLAMA_GRETYPE_RULE_REF, sub_rule_id)
|
|
)
|
|
pos = parse_space(pos + 1, is_nested)
|
|
# } else {
|
|
# break;
|
|
# }
|
|
else:
|
|
break
|
|
# }
|
|
# return pos;
|
|
# }
|
|
return pos
|
|
|
|
|
|
# const char * parse_alternates(
|
|
# parse_state & state,
|
|
# const char * src,
|
|
# const std::string & rule_name,
|
|
# uint32_t rule_id,
|
|
# bool is_nested) {
|
|
# std::vector<llama_grammar_element> rule;
|
|
# const char * pos = parse_sequence(state, src, rule_name, rule, is_nested);
|
|
# while (*pos == '|') {
|
|
# rule.push_back({LLAMA_GRETYPE_ALT, 0});
|
|
# pos = parse_space(pos + 1, true);
|
|
# pos = parse_sequence(state, pos, rule_name, rule, is_nested);
|
|
# }
|
|
# rule.push_back({LLAMA_GRETYPE_END, 0});
|
|
# add_rule(state, rule_id, rule);
|
|
# return pos;
|
|
# }
|
|
def parse_alternates(
|
|
state: parse_state,
|
|
src: const_char_p,
|
|
rule_name: str,
|
|
rule_id: int,
|
|
is_nested: bool,
|
|
) -> const_char_p:
|
|
rule = std.vector() # type: std.vector[LlamaGrammarElement]
|
|
pos = parse_sequence(state, src, rule_name, rule, is_nested) # type: const_char_p
|
|
while pos[0] == "|":
|
|
rule.push_back(LlamaGrammarElement(llama_gretype.LLAMA_GRETYPE_ALT, 0))
|
|
pos = parse_space(pos + 1, True)
|
|
pos = parse_sequence(state, pos, rule_name, rule, is_nested)
|
|
rule.push_back(LlamaGrammarElement(llama_gretype.LLAMA_GRETYPE_END, 0))
|
|
add_rule(state, rule_id, rule)
|
|
return pos
|
|
|
|
|
|
# const char * parse_rule(parse_state & state, const char * src) {
|
|
# const char * name_end = parse_name(src);
|
|
# const char * pos = parse_space(name_end, false);
|
|
# size_t name_len = name_end - src;
|
|
# uint32_t rule_id = get_symbol_id(state, src, name_len);
|
|
# const std::string name(src, name_len);
|
|
|
|
# if (!(pos[0] == ':' && pos[1] == ':' && pos[2] == '=')) {
|
|
# throw std::runtime_error(std::string("expecting ::= at ") + pos);
|
|
# }
|
|
# pos = parse_space(pos + 3, true);
|
|
|
|
# pos = parse_alternates(state, pos, name, rule_id, false);
|
|
|
|
|
|
# if (*pos == '\r') {
|
|
# pos += pos[1] == '\n' ? 2 : 1;
|
|
# } else if (*pos == '\n') {
|
|
# pos++;
|
|
# } else if (*pos) {
|
|
# throw std::runtime_error(std::string("expecting newline or end at ") + pos);
|
|
# }
|
|
# return parse_space(pos, true);
|
|
# }
|
|
def parse_rule(state: parse_state, src: const_char_p) -> const_char_p:
|
|
name_end = parse_name(src) # type: const_char_p
|
|
pos = parse_space(name_end, False) # type: const_char_p
|
|
name_len = name_end - src # type: int
|
|
rule_id = get_symbol_id(state, src, name_len) # type: int
|
|
name = std.string(src, name_len) # type: str
|
|
|
|
if not (pos[0] == ":" and pos[1] == ":" and pos[2] == "="):
|
|
raise RuntimeError("expecting ::= at " + str(pos))
|
|
|
|
pos = parse_space(pos + 3, True) # type: const_char_p
|
|
pos = parse_alternates(state, pos, name, rule_id, False) # type: const_char_p
|
|
|
|
if pos[0] == "\r":
|
|
pos += 2 if pos[1] == "\n" else 1
|
|
elif pos[0] == "\n":
|
|
pos += 1
|
|
elif pos[0]:
|
|
raise RuntimeError("expecting newline or end at " + str(pos))
|
|
return parse_space(pos, True)
|
|
|
|
|
|
# parse_state parse(const char * src) {
|
|
# try {
|
|
# parse_state state;
|
|
# const char * pos = parse_space(src, true);
|
|
# while (*pos) {
|
|
# pos = parse_rule(state, pos);
|
|
# }
|
|
# return state;
|
|
# } catch (const std::exception & err) {
|
|
# fprintf(stderr, "%s: error parsing grammar: %s\n", __func__, err.what());
|
|
# return parse_state();
|
|
# }
|
|
# }
|
|
def parse(src: const_char_p) -> parse_state:
|
|
try:
|
|
state = parse_state() # type: parse_state
|
|
pos = parse_space(src, True) # type: const_char_p
|
|
while pos[0]:
|
|
pos = parse_rule(state, pos)
|
|
return state
|
|
except Exception as err:
|
|
print(f"{parse.__name__}: error parsing grammar: {err}")
|
|
return parse_state()
|
|
|
|
|
|
# void print_grammar_char(FILE * file, uint32_t c) {
|
|
# if (0x20 <= c && c <= 0x7f) {
|
|
# fprintf(file, "%c", static_cast<char>(c));
|
|
# } else {
|
|
# // cop out of encoding UTF-8
|
|
# fprintf(file, "<U+%04X>", c);
|
|
# }
|
|
# }
|
|
def print_grammar_char(file: TextIO, c: int) -> None:
|
|
if 0x20 <= c and c <= 0x7F:
|
|
file.write(chr(c))
|
|
else:
|
|
# cop out of encoding UTF-8
|
|
file.write(f"<U+{c:04X}>")
|
|
|
|
|
|
# bool is_char_element(llama_grammar_element elem) {
|
|
# switch (elem.type) {
|
|
# case LLAMA_GRETYPE_CHAR: return true;
|
|
# case LLAMA_GRETYPE_CHAR_NOT: return true;
|
|
# case LLAMA_GRETYPE_CHAR_ALT: return true;
|
|
# case LLAMA_GRETYPE_CHAR_RNG_UPPER: return true;
|
|
# default: return false;
|
|
# }
|
|
# }
|
|
def is_char_element(elem: LlamaGrammarElement) -> bool:
|
|
return elem.type in (
|
|
llama_gretype.LLAMA_GRETYPE_CHAR,
|
|
llama_gretype.LLAMA_GRETYPE_CHAR_NOT,
|
|
llama_gretype.LLAMA_GRETYPE_CHAR_ALT,
|
|
llama_gretype.LLAMA_GRETYPE_CHAR_RNG_UPPER,
|
|
)
|
|
|
|
|
|
# void print_rule(
|
|
# FILE * file,
|
|
# uint32_t rule_id,
|
|
# const std::vector<llama_grammar_element> & rule,
|
|
# const std::map<uint32_t, std::string> & symbol_id_names) {
|
|
def print_rule(
|
|
file: TextIO,
|
|
rule_id: int,
|
|
rule: std.vector[LlamaGrammarElement],
|
|
symbol_id_names: std.map[int, str],
|
|
) -> None:
|
|
# if (rule.empty() || rule.back().type != LLAMA_GRETYPE_END) {
|
|
# throw std::runtime_error(
|
|
# "malformed rule, does not end with LLAMA_GRETYPE_END: " + std::to_string(rule_id));
|
|
# }
|
|
# fprintf(file, "%s ::= ", symbol_id_names.at(rule_id).c_str());
|
|
if rule.empty() or rule.back().type != llama_gretype.LLAMA_GRETYPE_END:
|
|
raise RuntimeError(
|
|
"malformed rule, does not end with LLAMA_GRETYPE_END: " + str(rule_id)
|
|
)
|
|
print(f"{symbol_id_names.at(rule_id)} ::=", file=file, end=" ")
|
|
# for (size_t i = 0, end = rule.size() - 1; i < end; i++) {
|
|
# llama_grammar_element elem = rule[i];
|
|
# switch (elem.type) {
|
|
# case LLAMA_GRETYPE_END:
|
|
# throw std::runtime_error(
|
|
# "unexpected end of rule: " + std::to_string(rule_id) + "," +
|
|
# std::to_string(i));
|
|
# case LLAMA_GRETYPE_ALT:
|
|
# fprintf(file, "| ");
|
|
# break;
|
|
# case LLAMA_GRETYPE_RULE_REF:
|
|
# fprintf(file, "%s ", symbol_id_names.at(elem.value).c_str());
|
|
# break;
|
|
# case LLAMA_GRETYPE_CHAR:
|
|
# fprintf(file, "[");
|
|
# print_grammar_char(file, elem.value);
|
|
# break;
|
|
# case LLAMA_GRETYPE_CHAR_NOT:
|
|
# fprintf(file, "[^");
|
|
# print_grammar_char(file, elem.value);
|
|
# break;
|
|
# case LLAMA_GRETYPE_CHAR_RNG_UPPER:
|
|
# if (i == 0 || !is_char_element(rule[i - 1])) {
|
|
# throw std::runtime_error(
|
|
# "LLAMA_GRETYPE_CHAR_RNG_UPPER without preceding char: " +
|
|
# std::to_string(rule_id) + "," + std::to_string(i));
|
|
# }
|
|
# fprintf(file, "-");
|
|
# print_grammar_char(file, elem.value);
|
|
# break;
|
|
# case LLAMA_GRETYPE_CHAR_ALT:
|
|
# if (i == 0 || !is_char_element(rule[i - 1])) {
|
|
# throw std::runtime_error(
|
|
# "LLAMA_GRETYPE_CHAR_ALT without preceding char: " +
|
|
# std::to_string(rule_id) + "," + std::to_string(i));
|
|
# }
|
|
# print_grammar_char(file, elem.value);
|
|
# break;
|
|
# }
|
|
for i, elem in enumerate(rule[:-1]):
|
|
case = elem.type # type: llama_gretype
|
|
if case is llama_gretype.LLAMA_GRETYPE_END:
|
|
raise RuntimeError("unexpected end of rule: " + str(rule_id) + "," + str(i))
|
|
elif case is llama_gretype.LLAMA_GRETYPE_ALT:
|
|
print("| ", file=file, end="")
|
|
elif case is llama_gretype.LLAMA_GRETYPE_RULE_REF:
|
|
print(f"{symbol_id_names.at(elem.value)} ", file=file, end="")
|
|
elif case is llama_gretype.LLAMA_GRETYPE_CHAR:
|
|
print("[", file=file, end="")
|
|
print_grammar_char(file, elem.value)
|
|
elif case is llama_gretype.LLAMA_GRETYPE_CHAR_NOT:
|
|
print("[^", file=file, end="")
|
|
print_grammar_char(file, elem.value)
|
|
elif case is llama_gretype.LLAMA_GRETYPE_CHAR_RNG_UPPER:
|
|
if i == 0 or not is_char_element(rule[i - 1]):
|
|
raise RuntimeError(
|
|
"LLAMA_GRETYPE_CHAR_RNG_UPPER without preceding char: "
|
|
+ str(rule_id)
|
|
+ ","
|
|
+ str(i)
|
|
)
|
|
print("-", file=file, end="")
|
|
print_grammar_char(file, elem.value)
|
|
elif case is llama_gretype.LLAMA_GRETYPE_CHAR_ALT:
|
|
if i == 0 or not is_char_element(rule[i - 1]):
|
|
raise RuntimeError(
|
|
"LLAMA_GRETYPE_CHAR_ALT without preceding char: "
|
|
+ str(rule_id)
|
|
+ ","
|
|
+ str(i)
|
|
)
|
|
print_grammar_char(file, elem.value)
|
|
# if (is_char_element(elem)) {
|
|
# switch (rule[i + 1].type) {
|
|
# case LLAMA_GRETYPE_CHAR_ALT:
|
|
# case LLAMA_GRETYPE_CHAR_RNG_UPPER:
|
|
# break;
|
|
# default:
|
|
# fprintf(file, "] ");
|
|
if is_char_element(elem):
|
|
if rule[i + 1].type in (
|
|
llama_gretype.LLAMA_GRETYPE_CHAR_ALT,
|
|
llama_gretype.LLAMA_GRETYPE_CHAR_RNG_UPPER,
|
|
):
|
|
pass
|
|
else:
|
|
print("] ", file=file, end="")
|
|
# }
|
|
# }
|
|
# }
|
|
# fprintf(file, "\n");
|
|
# }
|
|
print(file=file)
|
|
|
|
|
|
# void print_grammar(FILE * file, const parse_state & state) {
|
|
# try {
|
|
# std::map<uint32_t, std::string> symbol_id_names;
|
|
# for (auto kv : state.symbol_ids) {
|
|
# symbol_id_names[kv.second] = kv.first;
|
|
# }
|
|
# for (size_t i = 0, end = state.rules.size(); i < end; i++) {
|
|
# // fprintf(file, "%zu: ", i);
|
|
# // print_rule_binary(file, state.rules[i]);
|
|
# print_rule(file, i, state.rules[i], symbol_id_names);
|
|
# // fprintf(file, "\n");
|
|
# }
|
|
# } catch (const std::exception & err) {
|
|
# fprintf(stderr, "\n%s: error printing grammar: %s\n", __func__, err.what());
|
|
# }
|
|
# }
|
|
def print_grammar(file: TextIO, state: parse_state) -> None:
|
|
try:
|
|
symbol_id_names = std.map() # type: std.map[int, str]
|
|
for kv in state.symbol_ids.items():
|
|
symbol_id_names[kv[1]] = kv[0]
|
|
|
|
for i, rule in enumerate(state.rules):
|
|
print_rule(file, i, rule, symbol_id_names)
|
|
except Exception as err:
|
|
print(
|
|
f"{print_grammar.__name__}: error printing grammar: {err}",
|
|
file=sys.stderr,
|
|
)
|
|
|
|
|
|
"""llama.cpp gbnf rules from vendor/llama.cpp/grammars"""
|
|
|
|
ARITHMETIC_GBNF = r"""
|
|
root ::= (expr "=" ws term "\n")+
|
|
expr ::= term ([-+*/] term)*
|
|
term ::= ident | num | "(" ws expr ")" ws
|
|
ident ::= [a-z] [a-z0-9_]* ws
|
|
num ::= [0-9]+ ws
|
|
ws ::= [ \t\n]*
|
|
"""
|
|
|
|
C_GBNF = r"""
|
|
root ::= (declaration)*
|
|
|
|
declaration ::= dataType identifier "(" parameter? ")" "{" statement* "}"
|
|
|
|
dataType ::= "int" ws | "float" ws | "char" ws
|
|
identifier ::= [a-zA-Z_] [a-zA-Z_0-9]*
|
|
|
|
parameter ::= dataType identifier
|
|
|
|
statement ::=
|
|
( dataType identifier ws "=" ws expression ";" ) |
|
|
( identifier ws "=" ws expression ";" ) |
|
|
( identifier ws "(" argList? ")" ";" ) |
|
|
( "return" ws expression ";" ) |
|
|
( "while" "(" condition ")" "{" statement* "}" ) |
|
|
( "for" "(" forInit ";" ws condition ";" ws forUpdate ")" "{" statement* "}" ) |
|
|
( "if" "(" condition ")" "{" statement* "}" ("else" "{" statement* "}")? ) |
|
|
( singleLineComment ) |
|
|
( multiLineComment )
|
|
|
|
forInit ::= dataType identifier ws "=" ws expression | identifier ws "=" ws expression
|
|
forUpdate ::= identifier ws "=" ws expression
|
|
|
|
condition ::= expression relationOperator expression
|
|
relationOperator ::= ("<=" | "<" | "==" | "!=" | ">=" | ">")
|
|
|
|
expression ::= term (("+" | "-") term)*
|
|
term ::= factor(("*" | "/") factor)*
|
|
|
|
factor ::= identifier | number | unaryTerm | funcCall | parenExpression
|
|
unaryTerm ::= "-" factor
|
|
funcCall ::= identifier "(" argList? ")"
|
|
parenExpression ::= "(" ws expression ws ")"
|
|
|
|
argList ::= expression ("," ws expression)*
|
|
|
|
number ::= [0-9]+
|
|
|
|
singleLineComment ::= "//" [^\n]* "\n"
|
|
multiLineComment ::= "/*" ( [^*] | ("*" [^/]) )* "*/"
|
|
|
|
ws ::= ([ \t\n]+)
|
|
"""
|
|
|
|
CHESS_GBNF = r"""
|
|
root ::= object
|
|
value ::= object | array | string | number | ("true" | "false" | "null") ws
|
|
|
|
object ::=
|
|
"{" ws (
|
|
string ":" ws value
|
|
("," ws string ":" ws value)*
|
|
)? "}" ws
|
|
|
|
array ::=
|
|
"[" ws (
|
|
value
|
|
("," ws value)*
|
|
)? "]" ws
|
|
|
|
string ::=
|
|
"\"" (
|
|
[^"\\] |
|
|
"\\" (["\\/bfnrt] | "u" [0-9a-fA-F] [0-9a-fA-F] [0-9a-fA-F] [0-9a-fA-F]) # escapes
|
|
)* "\"" ws
|
|
|
|
number ::= ("-"? ([0-9] | [1-9] [0-9]*)) ("." [0-9]+)? ([eE] [-+]? [0-9]+)? ws
|
|
|
|
# Optional space: by convention, applied in this grammar after literal chars when allowed
|
|
ws ::= ([ \t\n] ws)?
|
|
"""
|
|
|
|
JAPANESE_GBNF = r"""
|
|
root ::= object
|
|
value ::= object | array | string | number | ("true" | "false" | "null") ws
|
|
|
|
object ::=
|
|
"{" ws (
|
|
string ":" ws value
|
|
("," ws string ":" ws value)*
|
|
)? "}" ws
|
|
|
|
array ::=
|
|
"[" ws (
|
|
value
|
|
("," ws value)*
|
|
)? "]" ws
|
|
|
|
string ::=
|
|
"\"" (
|
|
[^"\\] |
|
|
"\\" (["\\/bfnrt] | "u" [0-9a-fA-F] [0-9a-fA-F] [0-9a-fA-F] [0-9a-fA-F]) # escapes
|
|
)* "\"" ws
|
|
|
|
number ::= ("-"? ([0-9] | [1-9] [0-9]*)) ("." [0-9]+)? ([eE] [-+]? [0-9]+)? ws
|
|
|
|
# Optional space: by convention, applied in this grammar after literal chars when allowed
|
|
ws ::= ([ \t\n] ws)?
|
|
"""
|
|
|
|
JSON_ARR_GBNF = r"""
|
|
# This is the same as json.gbnf but we restrict whitespaces at the end of the root array
|
|
# Useful for generating JSON arrays
|
|
|
|
root ::= arr
|
|
value ::= object | array | string | number | ("true" | "false" | "null") ws
|
|
|
|
arr ::=
|
|
"[\n" ws (
|
|
value
|
|
(",\n" ws value)*
|
|
)? "]"
|
|
|
|
object ::=
|
|
"{" ws (
|
|
string ":" ws value
|
|
("," ws string ":" ws value)*
|
|
)? "}" ws
|
|
|
|
array ::=
|
|
"[" ws (
|
|
value
|
|
("," ws value)*
|
|
)? "]" ws
|
|
|
|
string ::=
|
|
"\"" (
|
|
[^"\\\x7F\x00-\x1F] |
|
|
"\\" (["\\/bfnrt] | "u" [0-9a-fA-F] [0-9a-fA-F] [0-9a-fA-F] [0-9a-fA-F]) # escapes
|
|
)* "\"" ws
|
|
|
|
number ::= ("-"? ([0-9] | [1-9] [0-9]*)) ("." [0-9]+)? ([eE] [-+]? [0-9]+)? ws
|
|
|
|
# Optional space: by convention, applied in this grammar after literal chars when allowed
|
|
ws ::= ([ \t\n] ws)?
|
|
"""
|
|
|
|
|
|
JSON_GBNF = r"""
|
|
root ::= object
|
|
value ::= object | array | string | number | ("true" | "false" | "null") ws
|
|
|
|
object ::=
|
|
"{" ws (
|
|
string ":" ws value
|
|
("," ws string ":" ws value)*
|
|
)? "}" ws
|
|
|
|
array ::=
|
|
"[" ws (
|
|
value
|
|
("," ws value)*
|
|
)? "]" ws
|
|
|
|
string ::=
|
|
"\"" (
|
|
[^"\\\x7F\x00-\x1F] |
|
|
"\\" (["\\/bfnrt] | "u" [0-9a-fA-F] [0-9a-fA-F] [0-9a-fA-F] [0-9a-fA-F]) # escapes
|
|
)* "\"" ws
|
|
|
|
number ::= ("-"? ([0-9] | [1-9] [0-9]*)) ("." [0-9]+)? ([eE] [-+]? [0-9]+)? ws
|
|
|
|
ws ::= ([ \t\n] ws)?
|
|
"""
|
|
|
|
LIST_GBNF = r"""
|
|
root ::= item+
|
|
|
|
# Excludes various line break characters
|
|
item ::= "- " [^\r\n\x0b\x0c\x85\u2028\u2029]+ "\n"
|
|
"""
|
|
|
|
"""llama.cpp json-schema to grammar converter from vendor/llama.cpp/examples/json-schema-to-grammar.py"""
|
|
import json
|
|
import re
|
|
from typing import List, Optional
|
|
|
|
# whitespace is constrained to a single space char to prevent model "running away" in
|
|
# whitespace. Also maybe improves generation quality?
|
|
SPACE_RULE = '" "?'
|
|
|
|
PRIMITIVE_RULES = {
|
|
"boolean": '("true" | "false") space',
|
|
"number": '("-"? ([0-9] | [1-9] [0-9]*)) ("." [0-9]+)? ([eE] [-+]? [0-9]+)? space',
|
|
"integer": '("-"? ([0-9] | [1-9] [0-9]*)) space',
|
|
"string": r""" "\"" (
|
|
[^"\\] |
|
|
"\\" (["\\/bfnrt] | "u" [0-9a-fA-F] [0-9a-fA-F] [0-9a-fA-F] [0-9a-fA-F])
|
|
)* "\"" space """,
|
|
"null": '"null" space',
|
|
}
|
|
|
|
INVALID_RULE_CHARS_RE = re.compile(r"[^a-zA-Z0-9-]+")
|
|
GRAMMAR_LITERAL_ESCAPE_RE = re.compile(r'[\r\n"]')
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GRAMMAR_LITERAL_ESCAPES = {"\r": "\\r", "\n": "\\n", '"': '\\"'}
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class SchemaConverter:
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def __init__(self, prop_order):
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self._prop_order = prop_order
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self._rules = {"space": SPACE_RULE}
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self._defs: Dict[str, Any] = {}
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def _format_literal(self, literal: str):
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escaped: str = GRAMMAR_LITERAL_ESCAPE_RE.sub(
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lambda m: GRAMMAR_LITERAL_ESCAPES.get(m.group(0)), json.dumps(literal)
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)
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return f'"{escaped}"'
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def _add_rule(self, name: str, rule: str):
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esc_name = INVALID_RULE_CHARS_RE.sub("-", name)
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if esc_name not in self._rules or self._rules[esc_name] == rule:
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key = esc_name
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else:
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i = 0
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while f"{esc_name}{i}" in self._rules:
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i += 1
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key = f"{esc_name}{i}"
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self._rules[key] = rule
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return key
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def visit(self, schema: Dict[str, Any], name: str) -> str:
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rule_name = name or "root"
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|
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if "$defs" in schema:
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# add defs to self._defs for later inlining
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for def_name, def_schema in schema["$defs"].items():
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self._defs[def_name] = def_schema
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if "oneOf" in schema or "anyOf" in schema:
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rule = " | ".join(
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(
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self.visit(alt_schema, f'{name}{"-" if name else ""}{i}')
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for i, alt_schema in enumerate(
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schema.get("oneOf") or schema["anyOf"]
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|
)
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|
)
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|
)
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|
return self._add_rule(rule_name, rule)
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|
|
|
elif "const" in schema:
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|
return self._add_rule(rule_name, self._format_literal(schema["const"]))
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|
|
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elif "enum" in schema:
|
|
rule = " | ".join((self._format_literal(v) for v in schema["enum"]))
|
|
return self._add_rule(rule_name, rule)
|
|
|
|
elif "$ref" in schema:
|
|
ref = schema["$ref"]
|
|
assert ref.startswith("#/$defs/"), f"Unrecognized schema: {schema}"
|
|
# inline $defs
|
|
def_name = ref[len("#/$defs/") :]
|
|
def_schema = self._defs[def_name]
|
|
return self.visit(def_schema, f'{name}{"-" if name else ""}{def_name}')
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|
|
|
|
|
schema_type: Optional[str] = schema.get("type") # type: ignore
|
|
assert isinstance(schema_type, str), f"Unrecognized schema: {schema}"
|
|
|
|
if schema_type == "object" and "properties" in schema:
|
|
# TODO: `required` keyword
|
|
if self._prop_order:
|
|
prop_order = self._prop_order
|
|
prop_pairs = sorted(
|
|
schema["properties"].items(),
|
|
# sort by position in prop_order (if specified) then by key
|
|
key=lambda kv: (prop_order.get(kv[0], len(prop_order)), kv[0]),
|
|
)
|
|
else:
|
|
prop_pairs = schema["properties"].items()
|
|
|
|
rule = '"{" space'
|
|
for i, (prop_name, prop_schema) in enumerate(prop_pairs):
|
|
prop_rule_name = self.visit(
|
|
prop_schema, f'{name}{"-" if name else ""}{prop_name}'
|
|
)
|
|
if i > 0:
|
|
rule += ' "," space'
|
|
rule += rf' {self._format_literal(prop_name)} space ":" space {prop_rule_name}'
|
|
rule += ' "}" space'
|
|
|
|
return self._add_rule(rule_name, rule)
|
|
|
|
elif schema_type == "array" and "items" in schema:
|
|
# TODO `prefixItems` keyword
|
|
item_rule_name = self.visit(
|
|
schema["items"], f'{name}{"-" if name else ""}item'
|
|
)
|
|
list_item_operator = f'("," space {item_rule_name})'
|
|
successive_items = ""
|
|
min_items = schema.get("minItems", 0)
|
|
if min_items > 0:
|
|
first_item = f"({item_rule_name})"
|
|
successive_items = list_item_operator * (min_items - 1)
|
|
min_items -= 1
|
|
else:
|
|
first_item = f"({item_rule_name})?"
|
|
max_items = schema.get("maxItems")
|
|
if max_items is not None and max_items > min_items:
|
|
successive_items += (list_item_operator + "?") * (max_items - min_items - 1)
|
|
else:
|
|
successive_items += list_item_operator + "*"
|
|
rule = f'"[" space {first_item} {successive_items} "]" space'
|
|
return self._add_rule(rule_name, rule)
|
|
|
|
else:
|
|
assert schema_type in PRIMITIVE_RULES, f"Unrecognized schema: {schema}"
|
|
return self._add_rule(
|
|
"root" if rule_name == "root" else schema_type,
|
|
PRIMITIVE_RULES[schema_type],
|
|
)
|
|
|
|
def format_grammar(self):
|
|
return "\n".join((f"{name} ::= {rule}" for name, rule in self._rules.items()))
|
|
|
|
|
|
def json_schema_to_gbnf(schema: str, prop_order: Optional[List[str]] = None):
|
|
prop_order = prop_order or []
|
|
schema = json.loads(schema)
|
|
prop_order = {name: idx for idx, name in enumerate(prop_order)}
|
|
converter = SchemaConverter(prop_order)
|
|
converter.visit(schema, "")
|
|
return converter.format_grammar()
|