diff --git a/llama_cpp/llama_cpp.py b/llama_cpp/llama_cpp.py index 423a4a0..d9a68a9 100644 --- a/llama_cpp/llama_cpp.py +++ b/llama_cpp/llama_cpp.py @@ -1157,6 +1157,23 @@ _lib.llama_sample_temperature.argtypes = [ _lib.llama_sample_temperature.restype = None +# LLAMA_API void llama_sample_grammar(struct llama_context * ctx, llama_token_data_array * candidates, const struct llama_grammar * grammar); +def llama_sample_grammar( + ctx: llama_context_p, + candidates, # type: _Pointer[llama_token_data_array] + grammar, # type: llama_grammar_p +): + return _lib.llama_sample_grammar(ctx, candidates, grammar) + + +_lib.llama_sample_grammar.argtypes = [ + llama_context_p, + llama_token_data_array_p, + llama_grammar_p, +] +_lib.llama_sample_grammar.restype = None + + # @details Mirostat 1.0 algorithm described in the paper https://arxiv.org/abs/2007.14966. Uses tokens instead of words. # @param candidates A vector of `llama_token_data` containing the candidate tokens, their probabilities (p), and log-odds (logit) for the current position in the generated text. # @param tau The target cross-entropy (or surprise) value you want to achieve for the generated text. A higher value corresponds to more surprising or less predictable text, while a lower value corresponds to less surprising or more predictable text. @@ -1244,6 +1261,23 @@ _lib.llama_sample_token.argtypes = [ _lib.llama_sample_token.restype = llama_token +# /// @details Accepts the sampled token into the grammar +# LLAMA_API void llama_grammar_accept_token(struct llama_context * ctx, struct llama_grammar * grammar, llama_token token); +def llama_grammar_accept_token( + ctx: llama_context_p, + grammar: llama_grammar_p, + token: llama_token, +) -> None: + _lib.llama_grammar_accept_token(ctx, grammar, token) + + +_lib.llama_grammar_accept_token.argtypes = [ + llama_context_p, + llama_grammar_p, + llama_token, +] +_lib.llama_grammar_accept_token.restype = None + # Performance information diff --git a/llama_cpp/llama_grammar.py b/llama_cpp/llama_grammar.py new file mode 100644 index 0000000..07a120f --- /dev/null +++ b/llama_cpp/llama_grammar.py @@ -0,0 +1,1331 @@ +"""C++ implementation of the llama grammar parser.""" +# flake8: noqa +import argparse +from pathlib import Path +import sys +from ctypes import Array, c_int, c_size_t, c_uint32, cast +from enum import Enum +from itertools import islice +from typing import ( + Callable, + Generic, + List, + Optional, + OrderedDict, + TextIO, + Tuple, + TypeVar, + Union, +) + +import llama_cpp + +T = TypeVar("T") +U = TypeVar("U") +V = TypeVar("V") +W = TypeVar("W") +size_t = uint8_t = uint32_t = int +static_cast_uint8_t = ord + + +class Sentinel: + pass + + +class const_char_p: + """C++ implementation of const char*.""" + + def __init__(self, value: Union[str, "const_char_p"]): + if isinstance(value, const_char_p): + # We're copying an existing const_char_p + self.value = value.value + self.pos = value.pos + return + + # We're creating a new const_char_p + self.value = value + self.pos = 0 + + def __str__(self) -> str: + return self.value[self.pos :] + + def __add__(self, increment: int) -> "const_char_p": + # To avoid side effects, we create a new const_char_p object + new = self.__class__(self.value) + new.pos = self.pos + increment + return new + + def __sub__(self, decrement: int) -> "const_char_p": + # To avoid side effects, we create a new const_char_p object + new = self.__class__(self.value) + new.pos = self.pos - decrement + return new + + def __lt__(self, other: "const_char_p") -> bool: + return self.pos < other.pos and self.value == other.value + + def __gt__(self, other: "const_char_p") -> bool: + return self.pos > other.pos and self.value == other.value + + def __eq__(self, other: "const_char_p") -> bool: + return self.pos == other.pos and self.value == other.value + + def add(self, other: "const_char_p") -> int: + if self.value != other.value: + raise ValueError("Can't add pointers to different strings") + return self.pos + other.pos + + def sub(self, other: "const_char_p") -> int: + if self.value != other.value: + raise ValueError("Can't subtract pointers to different strings") + return self.pos - other.pos + + def plus_plus(self) -> None: + self.pos += 1 + + def minus_minus(self) -> None: + self.pos -= 1 + + @property + def derefer(self) -> Optional[str]: + if self.pos >= len(self.value): + # We've reached the end of the string + return None + + return self.value[self.pos] + + +class std__vector(Generic[T], List[T]): + """C++ implementation of std::vector.""" + + class iterator: + def __init__(self, vector: "std__vector[T]", index: int): + self._vector = vector + self._index = index + self._version = vector._version + + def _check_version(self): + if self._version != self._vector._version: + raise RuntimeError("Iterator used after vector was modified.") + + def __iter__(self): + return self + + def __next__(self) -> T: + self._check_version() + if self._index >= self._vector.size(): + raise StopIteration + value = self._vector[self._index] + self._index += 1 + return value + + def __add__(self, value: int) -> "std__vector[T].iterator": + return self.__class__(self._vector, self._index + value) + + def __sub__(self, value: int) -> "std__vector[T].iterator": + return self.__class__(self._vector, self._index - value) + + def __init__(self): + self._version = 0 + + def modify(self): + # This is a bit of a hack to make sure iterators are invalidated + self._version += 1 + + def push_back(self, value: T) -> None: + self.modify() + self.append(value) + + def pop_back(self) -> None: + self.modify() + if not self.empty(): + self.pop() + + def back(self) -> T: + return self[-1] + + def size(self) -> int: + return len(self) + + # def clear(self) -> None: + # super().clear() + + def empty(self) -> bool: + return self.size() == 0 + + def data(self) -> "std__vector[T]": + return self + + def resize( + self, + new_size: int, + fill_value_factory: Optional[Callable[[], T]] = None, + ) -> None: + if new_size > self.size(): + if fill_value_factory is None: + raise ValueError( + "A fill value factory function must be provided." + ) + self.reserve(new_size, fill_value_factory) + elif new_size < self.size(): + self[:] = self[:new_size] + + def reserve( + self, capacity: int, fill_value_factory: Callable[[], T] + ) -> None: + if capacity > self.size(): + fill_value = fill_value_factory() + self.extend([fill_value] * (capacity - self.size())) + + def front(self) -> T: + if not self.empty(): + return self[0] + else: + raise IndexError("Vector is empty.") + + def assign(self, count: int, value: T) -> None: + self.clear() + self.extend([value] * count) + + def insert( + self, + pos: "std__vector[T].iterator", + first: "std__vector[T].iterator", + last: "std__vector[T].iterator", + ) -> None: + self[pos._index : pos._index] = list( + islice(first._vector, first._index, last._index) + ) + + def begin(self) -> "std__vector[T].iterator": + return self.iterator(self, 0) + + def end(self) -> "std__vector[T].iterator": + return self.iterator(self, self.size()) + + +class std__map(Generic[T, U], OrderedDict[T, U]): + """C++ implementation of std::map.""" + + class iterator(Generic[V, W]): + def __init__(self, _map: "std__map[T, U]", key: Union[T, Sentinel]): + self._map = _map + self.iter = iter(_map) + self.key = key + self._advance() + + def _sanitize_key(self) -> T: + if isinstance(self.key, Sentinel): + raise StopIteration + return self.key + + def _advance(self) -> None: + try: + while next(self.iter) != self.key: + pass + except StopIteration: + self.key = Sentinel() + + def __next__(self) -> Tuple[T, U]: + key = self._sanitize_key() + if key in self._map: + value = self._map[key] + self._advance() + return key, value + else: + raise StopIteration + + def get(self) -> Tuple[T, U]: + key = self._sanitize_key() + return key, self._map[key] + + @property + def first(self) -> T: + return self._sanitize_key() + + @property + def second(self) -> U: + return self._map[self._sanitize_key()] + + def insert( + self, key: T, value: U + ) -> Tuple["std__map[T, U].iterator[T, U]", bool]: + if key in self: + return self.iterator(self, key), False + else: + self[key] = value + return self.iterator(self, key), True + + def find(self, key: T) -> "std__map[T, U].iterator[T, U]": + if key in self: + return self.iterator(self, key) + else: + return self.end() + + def at(self, key: T) -> U: + if key in self: + return self[key] + else: + raise KeyError("The provided key is not found in the map.") + + def erase(self, iterator: "std__map[T, U].iterator[T, U]") -> None: + key = iterator.first + if key in self: + del self[key] + + def size(self) -> int: + return len(self) + + def empty(self) -> bool: + return self.size() == 0 + + def lower_bound(self, key: T) -> "std__map[T, U].iterator[T, U]": + try: + keys = sorted(list(self.keys())) # type: ignore + for k in keys: + if k >= key: + return self.iterator(self, k) + raise ValueError( + "No key found that is not less than the input key" + ) + except TypeError: + raise TypeError("Keys of type T cannot be sorted.") + + def begin(self) -> "std__map[T, U].iterator[T, U]": + return self.iterator(self, next(iter(self))) + + def end(self) -> "std__map[T, U].iterator[T, U]": + return self.iterator(self, Sentinel()) + + +class std__string(str): + def __new__(cls, ptr: const_char_p, length: Optional[int] = None): + if length is not None: + return super().__new__(cls, str(ptr)[:length]) + return super().__new__(cls, str(ptr)) + + +# // grammar element type +# enum llama_gretype { +# // end of rule definition +# LLAMA_GRETYPE_END = 0, + +# // start of alternate definition for rule +# LLAMA_GRETYPE_ALT = 1, + +# // non-terminal element: reference to rule +# LLAMA_GRETYPE_RULE_REF = 2, + +# // terminal element: character (code point) +# LLAMA_GRETYPE_CHAR = 3, + +# // inverse char(s) ([^a], [^a-b] [^abc]) +# LLAMA_GRETYPE_CHAR_NOT = 4, + +# // modifies a preceding LLAMA_GRETYPE_CHAR or LLAMA_GRETYPE_CHAR_ALT to +# // be an inclusive range ([a-z]) +# LLAMA_GRETYPE_CHAR_RNG_UPPER = 5, + + +# // modifies a preceding LLAMA_GRETYPE_CHAR or +# // LLAMA_GRETYPE_CHAR_RNG_UPPER to add an alternate char to match ([ab], [a-zA]) +# LLAMA_GRETYPE_CHAR_ALT = 6, +# }; +class llama_gretype(Enum): + """grammar element type""" + + LLAMA_GRETYPE_END = 0 # end of rule definition + LLAMA_GRETYPE_ALT = 1 # start of alternate definition for rule + LLAMA_GRETYPE_RULE_REF = 2 # non-terminal element: reference to rule + LLAMA_GRETYPE_CHAR = 3 # terminal element: character (code point) + LLAMA_GRETYPE_CHAR_NOT = 4 # inverse char(s) ([^a], [^a-b] [^abc]) + LLAMA_GRETYPE_CHAR_RNG_UPPER = 5 # modifies a preceding LLAMA_GRETYPE_CHAR or LLAMA_GRETYPE_CHAR_ALT to be an inclusive range ([a-z]) + 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]) + + +# typedef struct llama_grammar_element { +# enum llama_gretype type; +# uint32_t value; // Unicode code point or rule ID +# } llama_grammar_element; + + +# class llama_grammar_element(Structure): +# _fields_ = [ +# ("type", c_int), +# ("value", c_uint32), +# ] + + +class llama_grammar_element: + def __init__(self, type: llama_gretype, value: uint32_t): + self.type = type + self.value = value # Unicode code point or rule ID + + def __repr__(self): # debug + return f"llama_grammar_element({self.type}, {self.value})" + + +# struct parse_state { +# std::map symbol_ids; +# std::vector> rules; +# std::vector c_rules(); +# }; +class parse_state: + def __init__(self): + self.symbol_ids: std__map[str, uint32_t] = std__map() + self.rules: std__vector[ + std__vector[llama_grammar_element] + ] = std__vector() + + # std::vector parse_state::c_rules() { + # std::vector ret; + # for (const auto & rule : rules) { + # ret.push_back(rule.data()); + # } + # return ret; + # } + def c_rules(self) -> std__vector[std__vector[llama_grammar_element]]: + ret = ( + std__vector() + ) # type: std__vector[std__vector[llama_grammar_element]] + for rule in self.rules: + ret.push_back(rule.data()) + return ret + + +# struct llama_grammar { +# const std::vector> rules; +# std::vector> stacks; +# }; +class llama_grammar: + def __init__( + self, + rules: std__vector[std__vector[llama_grammar_element]], + stacks: std__vector[std__vector[llama_grammar_element]], + ): + self.rules = rules + self.stacks = stacks + + +# uint32_t get_symbol_id(parse_state & state, const char * src, size_t len) { +# uint32_t next_id = static_cast(state.symbol_ids.size()); +# auto result = state.symbol_ids.insert(std::make_pair(std::string(src, len), next_id)); +# return result.first->second; +# } +def get_symbol_id(state: parse_state, src: const_char_p, len: size_t) -> int: + next_id = uint32_t(state.symbol_ids.size()) # type: uint32_t + result = state.symbol_ids.insert(str(std__string(src, len)), next_id) + return result[0].second # type: ignore + + +# uint32_t generate_symbol_id(parse_state & state, const std::string & base_name) { +# uint32_t next_id = static_cast(state.symbol_ids.size()); +# state.symbol_ids[base_name + '_' + std::to_string(next_id)] = next_id; +# return next_id; +# } +def generate_symbol_id(state: parse_state, base_name: str) -> uint32_t: + next_id = state.symbol_ids.size() # type: uint32_t + 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 & 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: uint32_t, + rule: std__vector[llama_grammar_element], +) -> None: + if state.rules.size() <= rule_id: + state.rules.resize( + rule_id + 1, fill_value_factory=std__vector[llama_grammar_element] + ) + state.rules[rule_id] = rule + + +# std::pair 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(*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(*pos) & 0x3F); +# } +# return std::make_pair(value, pos); +# } +def decode_utf8(src: const_char_p) -> Tuple[uint32_t, 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 = static_cast_uint8_t(src.derefer or "") # type: uint8_t + highbits = first_byte >> 4 # type: uint8_t + len = lookup[highbits] # type: int + mask = (1 << (8 - len)) - 1 # type: uint8_t + value = first_byte & mask # type: uint32_t + end = src + len # type: const_char_p # may overrun! + pos = src + 1 # type: const_char_p + while pos < end and pos.derefer: + value = (value << 6) + (static_cast_uint8_t(src.derefer or "") & 0x3F) + pos.plus_plus() + 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 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[uint32_t, const_char_p]: + pos = const_char_p(src) # type: const_char_p + end = src + size # type: const_char_p + value = 0 # type: uint32_t + while pos < end and pos.derefer: + value <<= 4 + c = pos.derefer # type: str + if "a" <= c <= "f": + value += static_cast_uint8_t(c) - static_cast_uint8_t("a") + 10 + elif "A" <= c <= "F": + value += static_cast_uint8_t(c) - static_cast_uint8_t("A") + 10 + elif "0" <= c <= "9": + value += static_cast_uint8_t(c) - static_cast_uint8_t("0") + else: + break + pos.plus_plus() + if pos != end: + raise RuntimeError( + "expecting " + str(size) + " hex chars at " + str(src) + ) + return (value, pos) + + +# std::pair 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[uint32_t, const_char_p]: + if src.derefer == "\\": + switch = (src + 1).derefer # type: Optional[str] + if switch == "x": + return parse_hex(src + 2, 2) + elif switch == "u": + return parse_hex(src + 2, 4) + elif switch == "U": + return parse_hex(src + 2, 8) + elif switch == "t": + return (static_cast_uint8_t("\t"), src + 2) # implicit cast + elif switch == "r": + return (static_cast_uint8_t("\r"), src + 2) # implicit cast + elif switch == "n": + return (static_cast_uint8_t("\n"), src + 2) # implicit cast + elif switch in ("\\", '"', "[", "]"): + return (static_cast_uint8_t(switch), src + 2) # implicit cast + else: + raise RuntimeError("unknown escape at " + str(src)) + elif src.derefer: + 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.derefer or ""): + pos.plus_plus() + 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: + # Using a copy of `src` to avoid side effects + pos = const_char_p(src) + + while pos.derefer in (" ", "\t", "#") or ( + newline_ok and pos.derefer in ("\r", "\n") + ): + if pos.derefer == "#": + while pos.derefer is not None and pos.derefer not in ("\r", "\n"): + pos.plus_plus() + else: + pos.plus_plus() + + return pos + + +# const char * parse_sequence( +# parse_state & state, +# const char * src, +# const std::string & rule_name, +# std::vector & out_elements, +# bool is_nested) { +def parse_sequence( + state: parse_state, + src: const_char_p, + rule_name: str, + out_elements: std__vector[llama_grammar_element], + 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: size_t + pos = const_char_p(src) # type: const_char_p + # while (*pos) { + while pos.derefer: + # 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.derefer == '"': # literal string + pos.plus_plus() + last_sym_start = out_elements.size() + while pos.derefer != '"': + char_pair = parse_char( + pos + ) # type: Tuple[uint32_t, const_char_p] + pos = char_pair[1] + out_elements.push_back( + llama_grammar_element( + 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.derefer == "[": # char range(s) + pos.plus_plus() + 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.derefer == "^": + pos.plus_plus() + 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.derefer != "]": + char_pair = parse_char( + pos + ) # type: Tuple[uint32_t, 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( + llama_grammar_element(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.derefer == "-" and (pos + 1).derefer != "]": + endchar_pair = parse_char( + pos + 1 + ) # type: Tuple[uint32_t, const_char_p] + pos = endchar_pair[1] + out_elements.push_back( + llama_grammar_element( + 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.derefer): # rule reference + name_end = parse_name(pos) # type: const_char_p + ref_rule_id = get_symbol_id( + state, pos, name_end.sub(pos) + ) # type: uint32_t + pos = parse_space(name_end, is_nested) + last_sym_start = out_elements.size() + out_elements.push_back( + llama_grammar_element( + 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.derefer == "(": # grouping + pos = parse_space(pos + 1, True) + sub_rule_id = generate_symbol_id( + state, rule_name + ) # type: uint32_t + pos = parse_alternates(state, pos, rule_name, sub_rule_id, True) + last_sym_start = out_elements.size() + out_elements.push_back( + llama_grammar_element( + llama_gretype.LLAMA_GRETYPE_RULE_REF, sub_rule_id + ) + ) + if pos.derefer != ")": + 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.derefer 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 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: uint32_t + sub_rule = std__vector[llama_grammar_element]() + 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.derefer in ("*", "+"): + sub_rule.push_back( + llama_grammar_element( + llama_gretype.LLAMA_GRETYPE_RULE_REF, sub_rule_id + ) + ) + sub_rule.push_back( + llama_grammar_element(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.derefer == "+": + sub_rule.insert( + sub_rule.end(), + out_elements.begin() + last_sym_start, + out_elements.end(), + ) + sub_rule.push_back( + llama_grammar_element(llama_gretype.LLAMA_GRETYPE_END, 0) + ) + add_rule(state, sub_rule_id, sub_rule) + out_elements.resize(last_sym_start) + out_elements.push_back( + llama_grammar_element( + 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 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: uint32_t, + is_nested: bool, +) -> const_char_p: + rule = std__vector() # type: std__vector[llama_grammar_element] + pos = parse_sequence( + state, src, rule_name, rule, is_nested + ) # type: const_char_p + while pos.derefer == "|": + rule.push_back( + llama_grammar_element(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(llama_grammar_element(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.sub(src) # type: size_t + rule_id = get_symbol_id(state, src, name_len) # type: uint32_t + name = std__string(src, name_len) # type: std__string + + if not ( + pos.derefer == ":" + and (pos + 1).derefer == ":" + and (pos + 2).derefer == "=" + ): + 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.derefer == "\r": + pos += 2 if (pos + 1).derefer == "\n" else 1 + elif pos.derefer == "\n": + pos.plus_plus() + elif pos.derefer: + 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.derefer: + 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(c)); +# } else { +# // cop out of encoding UTF-8 +# fprintf(file, "", c); +# } +# } +def print_grammar_char(file: TextIO, c: uint32_t) -> None: + if 0x20 <= c and c <= 0x7F: + file.write(chr(c)) + else: + # cop out of encoding UTF-8 + file.write(f"") + + +# 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: llama_grammar_element) -> 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 & rule, +# const std::map & symbol_id_names) { +def print_rule( + file: TextIO, + rule_id: uint32_t, + rule: std__vector[llama_grammar_element], + symbol_id_names: std__map[uint32_t, 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]): + switch = elem.type # type: llama_gretype + if switch == llama_gretype.LLAMA_GRETYPE_END: + raise RuntimeError( + "unexpected end of rule: " + str(rule_id) + "," + str(i) + ) + elif switch == llama_gretype.LLAMA_GRETYPE_ALT: + print("| ", file=file, end="") + elif switch == llama_gretype.LLAMA_GRETYPE_RULE_REF: + print(f"{symbol_id_names.at(elem.value)} ", file=file, end="") + elif switch == llama_gretype.LLAMA_GRETYPE_CHAR: + print("[", file=file, end="") + print_grammar_char(file, elem.value) + elif switch == llama_gretype.LLAMA_GRETYPE_CHAR_NOT: + print("[^", file=file, end="") + print_grammar_char(file, elem.value) + elif switch == 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 switch == 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 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[uint32_t, 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, + ) + + +def convert_to_rules( + llama_grammar_elements: std__vector[std__vector[llama_grammar_element]], +) -> Array[llama_cpp.llama_grammar_element_p]: + """Make an Array object that is used for `llama_grammer_init`""" + + # Step 1: Convert to c_llama_grammar_element + llama_grammar_element_p_p = ( + [] + ) # type: List[List[llama_cpp.llama_grammar_element]] + for subvector in llama_grammar_elements: + llama_grammar_element_p_p.append([]) + for elem in subvector: + c_llama_grammar_element = llama_cpp.llama_grammar_element() + c_llama_grammar_element.type = c_int(elem.type.value) + c_llama_grammar_element.value = c_uint32(elem.value) + llama_grammar_element_p_p[-1].append(c_llama_grammar_element) + + # Step 2: Convert each list to llama_grammar_element array and get pointer + element_arrays = [ + (llama_cpp.llama_grammar_element * len(sublist))(*sublist) + for sublist in llama_grammar_element_p_p + ] # type: List[Array[llama_cpp.llama_grammar_element]] + + # Step 3: Get pointer of each array + element_array_pointers = [ + cast(sublist, llama_cpp.llama_grammar_element_p) + for sublist in element_arrays + ] # type: List[llama_cpp.llama_grammar_element_p] + + # Step 4: Make array of these pointers and get its pointer + return (llama_cpp.llama_grammar_element_p * len(element_array_pointers))( + *element_array_pointers + ) + + +def parse_grammar_init_args( + bnf: str, +) -> Tuple[Array[llama_cpp.llama_grammar_element_p], c_size_t, c_size_t]: + """Parse a GBNF string and return tuple of `grammar rules` and `root symbol id`""" + parsed_grammar = parse(const_char_p(bnf)) # type: parse_state + if parsed_grammar.rules.empty(): + raise Exception( + f"{parse_grammar_init_args.__name__}: error parsing grammar file: parsed_grammar.rules is empty" + ) + print(f"{parse_grammar_init_args.__name__} grammar:", file=sys.stderr) + print_grammar(sys.stdout, parsed_grammar) + print(file=sys.stderr) + grammar_rules = ( + parsed_grammar.c_rules() + ) # type: std__vector[std__vector[llama_grammar_element]] + return ( + convert_to_rules(grammar_rules), + c_size_t(grammar_rules.size()), + c_size_t(parsed_grammar.symbol_ids.at("root")), + ) + + +def parse_grammar_init_args_from_file( + bnf_path: Union[str, Path] +) -> Tuple[Array[llama_cpp.llama_grammar_element_p], c_size_t, c_size_t]: + """Parse a GBNF file and return tuple of `grammar rules` and `root symbol id`""" + try: + with open(bnf_path) as f: + params_grammer = f.read() + except Exception as err: + raise Exception( + f"{parse_grammar_init_args_from_file.__name__}: error reading grammar file: {err}" + ) + + if params_grammer: + return parse_grammar_init_args(params_grammer) + + raise Exception( + f"{parse_grammar_init_args_from_file.__name__}: error parsing grammar file: params_grammer is empty" + ) + + +# def get_grammar_p(bnf: str) -> llama_cpp.llama_grammar_p: +# """Parse a GBNF string and return pointer to `llama_grammar`""" + +# grammar_rules, root_symbol_id = parse_rules(bnf) + +# grammar_element_p_p = convert_to_double_ptr( +# grammar_rules +# ) # type: llama_cpp.llama_grammar_element_p_p + +# c_llama_grammar_p = llama_cpp.llama_grammar_init( +# grammar_element_p_p, +# c_size_t(grammar_rules.size()), +# c_size_t(root_symbol_id), +# ) # type: llama_cpp.llama_grammar_p +# return c_llama_grammar_p + + +# def get_grammar_p_from_file( +# bnf_path: Union[str, Path] +# ) -> llama_cpp.llama_grammar_p: +# """Parse a GBNF file and return pointer to `llama_grammar`""" +# try: +# with open(bnf_path) as f: +# params_grammer = f.read() +# except Exception as err: +# raise Exception( +# f"{get_grammar_p_from_file.__name__}: error reading grammar file: {err}" +# ) + +# if params_grammer: +# return get_grammar_p(params_grammer) + +# raise Exception( +# f"{get_grammar_p_from_file.__name__}: error parsing grammar file: params_grammer is empty" +# ) + + +if __name__ == "__main__": + parser = argparse.ArgumentParser( + description="Generate C++ parser from GBNF grammar" + ) + parser.add_argument( + "-g", + "--grammar", + type=str, + default="./vendor/llama.cpp/grammars/json.gbnf", + help="path to GBNF grammar file", + ) + + args = parser.parse_args() + rules, n_rules, start_rule_index = parse_grammar_init_args_from_file( + args.grammar + ) + llama_grammar_p = llama_cpp.llama_grammar_init( + rules, + n_rules, + start_rule_index, + ) # type: llama_cpp.llama_grammar_p + + # ----- USAGE: + # llama_cpp.llama_sample_grammar(ctx=..., candidates=..., grammar=llama_grammar_p) + # llama_cpp.llama_grammar_accept_token(ctx=..., grammar=llama_grammar_p, token=...) + + # ----- SAMPLE OUTPUT: + # main grammar: + # root ::= object + # object ::= [{] ws object_11 [}] ws + # value ::= object | array | string | number | value_6 ws + # array ::= [[] ws array_15 []] ws + # string ::= ["] string_18 ["] ws + # number ::= number_19 number_25 number_29 ws + # value_6 ::= [t] [r] [u] [e] | [f] [a] [l] [s] [e] | [n] [u] [l] [l] + # ws ::= ws_31 + # object_8 ::= string [:] ws value object_10 + # object_9 ::= [,] ws string [:] ws value + # object_10 ::= object_9 object_10 | + # object_11 ::= object_8 | + # array_12 ::= value array_14 + # array_13 ::= [,] ws value + # array_14 ::= array_13 array_14 | + # array_15 ::= array_12 | + # string_16 ::= [^"\] | [\] string_17 + # string_17 ::= ["\/bfnrt] | [u] [0-9a-fA-F] [0-9a-fA-F] [0-9a-fA-F] [0-9a-fA-F] + # string_18 ::= string_16 string_18 | + # number_19 ::= number_20 number_21 + # number_20 ::= [-] | + # number_21 ::= [0-9] | [1-9] number_22 + # number_22 ::= [0-9] number_22 | + # number_23 ::= [.] number_24 + # number_24 ::= [0-9] number_24 | [0-9] + # number_25 ::= number_23 | + # number_26 ::= [eE] number_27 number_28 + # number_27 ::= [-+] | + # number_28 ::= [0-9] number_28 | [0-9] + # number_29 ::= number_26 | + # ws_30 ::= [ ] ws + # ws_31 ::= ws_30 |