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298 lines
9.8 KiB
298 lines
9.8 KiB
# cython: infer_types=True
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# coding: utf8
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from __future__ import unicode_literals, absolute_import
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cimport cython
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from libc.string cimport memcpy
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from libcpp.set cimport set
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from libc.stdint cimport uint32_t
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from murmurhash.mrmr cimport hash64, hash32
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import ujson
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from .symbols import IDS as SYMBOLS_BY_STR
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from .symbols import NAMES as SYMBOLS_BY_INT
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from .typedefs cimport hash_t
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from .compat import json_dumps
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from .errors import Errors
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from . import util
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cpdef hash_t hash_string(unicode string) except 0:
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chars = string.encode('utf8')
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return hash_utf8(chars, len(chars))
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cdef hash_t hash_utf8(char* utf8_string, int length) nogil:
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return hash64(utf8_string, length, 1)
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cdef uint32_t hash32_utf8(char* utf8_string, int length) nogil:
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return hash32(utf8_string, length, 1)
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cdef unicode decode_Utf8Str(const Utf8Str* string):
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cdef int i, length
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if string.s[0] < sizeof(string.s) and string.s[0] != 0:
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return string.s[1:string.s[0]+1].decode('utf8')
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elif string.p[0] < 255:
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return string.p[1:string.p[0]+1].decode('utf8')
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else:
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i = 0
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length = 0
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while string.p[i] == 255:
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i += 1
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length += 255
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length += string.p[i]
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i += 1
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return string.p[i:length + i].decode('utf8')
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cdef Utf8Str* _allocate(Pool mem, const unsigned char* chars, uint32_t length) except *:
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cdef int n_length_bytes
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cdef int i
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cdef Utf8Str* string = <Utf8Str*>mem.alloc(1, sizeof(Utf8Str))
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cdef uint32_t ulength = length
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if length < sizeof(string.s):
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string.s[0] = <unsigned char>length
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memcpy(&string.s[1], chars, length)
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return string
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elif length < 255:
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string.p = <unsigned char*>mem.alloc(length + 1, sizeof(unsigned char))
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string.p[0] = length
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memcpy(&string.p[1], chars, length)
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return string
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else:
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i = 0
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n_length_bytes = (length // 255) + 1
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string.p = <unsigned char*>mem.alloc(length + n_length_bytes, sizeof(unsigned char))
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for i in range(n_length_bytes-1):
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string.p[i] = 255
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string.p[n_length_bytes-1] = length % 255
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memcpy(&string.p[n_length_bytes], chars, length)
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return string
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cdef class StringStore:
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"""Look up strings by 64-bit hashes."""
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def __init__(self, strings=None, freeze=False):
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"""Create the StringStore.
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strings (iterable): A sequence of unicode strings to add to the store.
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RETURNS (StringStore): The newly constructed object.
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"""
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self.mem = Pool()
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self._map = PreshMap()
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if strings is not None:
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for string in strings:
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self.add(string)
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def __getitem__(self, object string_or_id):
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"""Retrieve a string from a given hash, or vice versa.
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string_or_id (bytes, unicode or uint64): The value to encode.
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Returns (unicode or uint64): The value to be retrieved.
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"""
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if isinstance(string_or_id, basestring) and len(string_or_id) == 0:
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return 0
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elif string_or_id == 0:
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return u''
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elif string_or_id in SYMBOLS_BY_STR:
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return SYMBOLS_BY_STR[string_or_id]
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cdef hash_t key
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if isinstance(string_or_id, unicode):
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key = hash_string(string_or_id)
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return key
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elif isinstance(string_or_id, bytes):
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key = hash_utf8(string_or_id, len(string_or_id))
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return key
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elif string_or_id < len(SYMBOLS_BY_INT):
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return SYMBOLS_BY_INT[string_or_id]
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else:
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key = string_or_id
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self.hits.insert(key)
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utf8str = <Utf8Str*>self._map.get(key)
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if utf8str is NULL:
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raise KeyError(Errors.E018.format(hash_value=string_or_id))
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else:
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return decode_Utf8Str(utf8str)
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def add(self, string):
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"""Add a string to the StringStore.
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string (unicode): The string to add.
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RETURNS (uint64): The string's hash value.
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"""
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if isinstance(string, unicode):
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if string in SYMBOLS_BY_STR:
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return SYMBOLS_BY_STR[string]
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key = hash_string(string)
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self.intern_unicode(string)
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elif isinstance(string, bytes):
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if string in SYMBOLS_BY_STR:
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return SYMBOLS_BY_STR[string]
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key = hash_utf8(string, len(string))
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self._intern_utf8(string, len(string))
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else:
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raise TypeError(Errors.E017.format(value_type=type(string)))
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return key
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def __len__(self):
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"""The number of strings in the store.
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RETURNS (int): The number of strings in the store.
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"""
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return self.keys.size()
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def __contains__(self, string not None):
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"""Check whether a string is in the store.
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string (unicode): The string to check.
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RETURNS (bool): Whether the store contains the string.
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"""
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cdef hash_t key
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if isinstance(string, int) or isinstance(string, long):
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if string == 0:
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return True
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key = string
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elif len(string) == 0:
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return True
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elif string in SYMBOLS_BY_STR:
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return True
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elif isinstance(string, unicode):
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key = hash_string(string)
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else:
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string = string.encode('utf8')
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key = hash_utf8(string, len(string))
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if key < len(SYMBOLS_BY_INT):
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return True
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else:
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self.hits.insert(key)
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return self._map.get(key) is not NULL
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def __iter__(self):
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"""Iterate over the strings in the store, in order.
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YIELDS (unicode): A string in the store.
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"""
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cdef int i
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cdef hash_t key
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for i in range(self.keys.size()):
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key = self.keys[i]
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self.hits.insert(key)
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utf8str = <Utf8Str*>self._map.get(key)
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yield decode_Utf8Str(utf8str)
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# TODO: Iterate OOV here?
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def __reduce__(self):
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strings = list(self)
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return (StringStore, (strings,), None, None, None)
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def to_disk(self, path):
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"""Save the current state to a directory.
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path (unicode or Path): A path to a directory, which will be created if
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it doesn't exist. Paths may be either strings or Path-like objects.
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"""
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path = util.ensure_path(path)
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strings = list(self)
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with path.open('w') as file_:
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file_.write(json_dumps(strings))
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def from_disk(self, path):
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"""Loads state from a directory. Modifies the object in place and
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returns it.
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path (unicode or Path): A path to a directory. Paths may be either
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strings or `Path`-like objects.
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RETURNS (StringStore): The modified `StringStore` object.
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"""
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path = util.ensure_path(path)
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with path.open('r') as file_:
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strings = ujson.load(file_)
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prev = list(self)
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self._reset_and_load(strings)
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for word in prev:
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self.add(word)
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return self
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def to_bytes(self, **exclude):
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"""Serialize the current state to a binary string.
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**exclude: Named attributes to prevent from being serialized.
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RETURNS (bytes): The serialized form of the `StringStore` object.
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"""
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return json_dumps(list(self))
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def from_bytes(self, bytes_data, **exclude):
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"""Load state from a binary string.
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bytes_data (bytes): The data to load from.
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**exclude: Named attributes to prevent from being loaded.
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RETURNS (StringStore): The `StringStore` object.
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"""
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strings = ujson.loads(bytes_data)
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prev = list(self)
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self._reset_and_load(strings)
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for word in prev:
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self.add(word)
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return self
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def _reset_and_load(self, strings):
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self.mem = Pool()
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self._map = PreshMap()
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self.keys.clear()
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self.hits.clear()
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for string in strings:
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self.add(string)
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def _cleanup_stale_strings(self, excepted):
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"""
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excepted (list): Strings that should not be removed.
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RETURNS (keys, strings): Dropped strings and keys that can be dropped from other places
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"""
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if self.hits.size() == 0:
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# If we don't have any hits, just skip cleanup
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return
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cdef vector[hash_t] tmp
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dropped_strings = []
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dropped_keys = []
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for i in range(self.keys.size()):
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key = self.keys[i]
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# Here we cannot use __getitem__ because it also set hit.
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utf8str = <Utf8Str*>self._map.get(key)
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value = decode_Utf8Str(utf8str)
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if self.hits.count(key) != 0 or value in excepted:
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tmp.push_back(key)
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else:
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dropped_keys.append(key)
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dropped_strings.append(value)
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self.keys.swap(tmp)
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strings = list(self)
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self._reset_and_load(strings)
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# Here we have strings but hits to it should be reseted
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self.hits.clear()
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return dropped_keys, dropped_strings
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cdef const Utf8Str* intern_unicode(self, unicode py_string):
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# 0 means missing, but we don't bother offsetting the index.
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cdef bytes byte_string = py_string.encode('utf8')
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return self._intern_utf8(byte_string, len(byte_string))
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@cython.final
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cdef const Utf8Str* _intern_utf8(self, char* utf8_string, int length):
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# TODO: This function's API/behaviour is an unholy mess...
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# 0 means missing, but we don't bother offsetting the index.
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cdef hash_t key = hash_utf8(utf8_string, length)
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cdef Utf8Str* value = <Utf8Str*>self._map.get(key)
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if value is not NULL:
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return value
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value = _allocate(self.mem, <unsigned char*>utf8_string, length)
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self._map.set(key, value)
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self.hits.insert(key)
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self.keys.push_back(key)
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return value
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