from __future__ import unicode_literals import codecs from libc.string cimport memcpy from murmurhash.mrmr cimport hash64 from cpython cimport PyUnicode_AS_DATA from cpython cimport PyUnicode_GET_DATA_SIZE from libc.stdint cimport int64_t from .typedefs cimport hash_t, attr_t SEPARATOR = '\n|-SEP-|\n' cpdef hash_t hash_string(unicode string) except 0: # This has to be like this for chars = PyUnicode_AS_DATA(string) size = PyUnicode_GET_DATA_SIZE(string) return hash64(chars, size, 1) cdef unicode _decode(const Utf8Str* string): cdef int i, length if string.s[0] < sizeof(string.s) and string.s[0] != 0: return string.s[1:string.s[0]+1].decode('utf8') elif string.p[0] < 255: return string.p[1:string.p[0]+1].decode('utf8') else: i = 0 length = 0 while string.p[i] == 255: i += 1 length += 255 length += string.p[i] i += 1 return string.p[i:length + i].decode('utf8') cdef Utf8Str _allocate(Pool mem, const unsigned char* chars, int length) except *: cdef int n_length_bytes cdef int i cdef Utf8Str string assert length != 0 if length < sizeof(string.s): string.s[0] = length memcpy(&string.s[1], chars, length) return string elif length < 255: string.p = mem.alloc(length + 1, sizeof(unsigned char)) string.p[0] = length memcpy(&string.p[1], chars, length) assert string.s[0] >= sizeof(string.s) or string.s[0] == 0, string.s[0] return string else: i = 0 n_length_bytes = (length // 255) + 1 string.p = mem.alloc(length + n_length_bytes, sizeof(unsigned char)) for i in range(n_length_bytes-1): string.p[i] = 255 string.p[n_length_bytes-1] = length % 255 memcpy(&string.p[n_length_bytes], chars, length) assert string.s[0] >= sizeof(string.s) or string.s[0] == 0, string.s[0] return string cdef class StringStore: '''Map strings to and from integer IDs.''' def __init__(self): self.mem = Pool() self._map = PreshMap() self._resize_at = 10000 self.c = self.mem.alloc(self._resize_at, sizeof(Utf8Str)) self.size = 1 property size: def __get__(self): return self.size -1 def __len__(self): return self.size-1 def __getitem__(self, object string_or_id): cdef bytes byte_string cdef const Utf8Str* utf8str cdef int id_ if isinstance(string_or_id, int) or isinstance(string_or_id, long): if string_or_id == 0: return u'' elif string_or_id < 1 or string_or_id >= self.size: raise IndexError(string_or_id) utf8str = &self.c[string_or_id] return _decode(utf8str) elif isinstance(string_or_id, bytes): if len(string_or_id) == 0: return 0 utf8str = self.intern(string_or_id, len(string_or_id)) return utf8str - self.c elif isinstance(string_or_id, unicode): if len(string_or_id) == 0: return 0 byte_string = string_or_id.encode('utf8') utf8str = self.intern(byte_string, len(byte_string)) return utf8str - self.c else: raise TypeError(type(string_or_id)) def __iter__(self): cdef int i for i in range(self.size): yield self[i] cdef const Utf8Str* intern(self, unsigned char* chars, int length) except NULL: # 0 means missing, but we don't bother offsetting the index. key = hash64(chars, length * sizeof(char), 0) value = self._map.get(key) if value != NULL: return value if self.size == self._resize_at: self._realloc() self.c[self.size] = _allocate(self.mem, chars, length) self._map.set(key, &self.c[self.size]) self.size += 1 return &self.c[self.size-1] def dump(self, loc): cdef Utf8Str* string cdef unicode py_string cdef int i with codecs.open(loc, 'w', 'utf8') as file_: for i in range(1, self.size): string = &self.c[i] py_string = _decode(string) file_.write(py_string) if (i+1) != self.size: file_.write(SEPARATOR) def load(self, loc): with codecs.open(loc, 'r', 'utf8') as file_: strings = file_.read().split(SEPARATOR) if strings == ['']: return None cdef unicode string cdef bytes byte_string for string in strings: byte_string = string.encode('utf8') self.intern(byte_string, len(byte_string)) def _realloc(self): # We want to map straight to pointers, but they'll be invalidated if # we resize our array. So, first we remap to indices, then we resize, # then we can acquire the new pointers. cdef Pool tmp_mem = Pool() keys = tmp_mem.alloc(self.size, sizeof(hash_t)) cdef hash_t key cdef size_t addr cdef const Utf8Str ptr cdef size_t i for key, addr in self._map.items(): # Find array index with pointer arithmetic i = (addr) - self.c keys[i] = key self._resize_at *= 2 cdef size_t new_size = self._resize_at * sizeof(Utf8Str) self.c = self.mem.realloc(self.c, new_size) self._map = PreshMap(self.size) for i in range(self.size): self._map.set(keys[i], &self.c[i])