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81 lines
2.9 KiB
Cython
81 lines
2.9 KiB
Cython
from libc.string cimport memcpy
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from murmurhash.mrmr cimport hash64
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import codecs
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SEPARATOR = '\n|-SEP-|\n'
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cdef class StringStore:
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def __init__(self):
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self.mem = Pool()
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self._map = PreshMap()
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self._resize_at = 10000
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self.strings = <Utf8Str*>self.mem.alloc(self._resize_at, sizeof(Utf8Str))
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self.size = 1
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property size:
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def __get__(self):
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return self.size-1
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def __getitem__(self, object string_or_id):
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cdef bytes byte_string
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cdef Utf8Str* utf8str
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if isinstance(string_or_id, int) or isinstance(string_or_id, long):
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if string_or_id < 1 or string_or_id >= self.size:
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raise IndexError(string_or_id)
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utf8str = &self.strings[<int>string_or_id]
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return utf8str.chars[:utf8str.length]
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elif isinstance(string_or_id, bytes):
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utf8str = self.intern(<char*>string_or_id, len(string_or_id))
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return utf8str.i
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elif isinstance(string_or_id, unicode):
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byte_string = string_or_id.encode('utf8')
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utf8str = self.intern(<char*>byte_string, len(byte_string))
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return utf8str.i
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else:
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raise TypeError(type(string_or_id))
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cdef Utf8Str* intern(self, char* chars, int length) except NULL:
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# 0 means missing, but we don't bother offsetting the index. We waste
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# slot 0 to simplify the code, because it doesn't matter.
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assert length != 0
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cdef hash_t key = hash64(chars, length * sizeof(char), 0)
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cdef void* value = self._map.get(key)
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cdef size_t i
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if value == NULL:
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if self.size == self._resize_at:
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self._resize_at *= 2
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self.strings = <Utf8Str*>self.mem.realloc(self.strings, self._resize_at * sizeof(Utf8Str))
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i = self.size
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self.strings[i].i = self.size
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self.strings[i].key = key
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self.strings[i].chars = <char*>self.mem.alloc(length, sizeof(char))
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memcpy(self.strings[i].chars, chars, length)
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self.strings[i].length = length
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self._map.set(key, <void*>self.size)
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self.size += 1
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else:
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i = <size_t>value
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return &self.strings[i]
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def dump(self, loc):
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strings = []
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cdef Utf8Str* string
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cdef bytes py_string
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for i in range(self.size):
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string = &self.strings[i]
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py_string = string.chars[:string.length]
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strings.append(py_string.decode('utf8'))
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with codecs.open(loc, 'w', 'utf8') as file_:
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file_.write(SEPARATOR.join(strings))
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def load(self, loc):
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with codecs.open(loc, 'r', 'utf8') as file_:
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strings = file_.read().split(SEPARATOR)
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cdef unicode string
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cdef bytes byte_string
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for string in strings[1:]:
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byte_string = string.encode('utf8')
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self.intern(byte_string, len(byte_string))
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