mirror of https://github.com/explosion/spaCy.git
363 lines
12 KiB
Cython
363 lines
12 KiB
Cython
from libc.string cimport memcpy, memset
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from libc.stdlib cimport malloc, calloc, free
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from libc.stdint cimport uint32_t
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from ..vocab cimport EMPTY_LEXEME
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from ..structs cimport TokenC, Entity
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from ..lexeme cimport Lexeme
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from ..symbols cimport punct
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from ..attrs cimport IS_SPACE
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cdef inline bint is_space_token(const TokenC* token) nogil:
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return Lexeme.c_check_flag(token.lex, IS_SPACE)
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cdef cppclass StateC:
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int* _stack
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int* _buffer
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bint* shifted
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TokenC* _sent
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Entity* _ents
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TokenC _empty_token
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int length
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int _s_i
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int _b_i
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int _e_i
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int _break
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__init__(const TokenC* sent, int length) nogil:
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cdef int PADDING = 5
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this._buffer = <int*>calloc(length + (PADDING * 2), sizeof(int))
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this._stack = <int*>calloc(length + (PADDING * 2), sizeof(int))
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this.shifted = <bint*>calloc(length + (PADDING * 2), sizeof(bint))
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this._sent = <TokenC*>calloc(length + (PADDING * 2), sizeof(TokenC))
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this._ents = <Entity*>calloc(length + (PADDING * 2), sizeof(Entity))
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cdef int i
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for i in range(length + (PADDING * 2)):
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this._ents[i].end = -1
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this._sent[i].l_edge = i
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this._sent[i].r_edge = i
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for i in range(length, length + (PADDING * 2)):
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this._sent[i].lex = &EMPTY_LEXEME
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this._sent += PADDING
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this._ents += PADDING
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this._buffer += PADDING
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this._stack += PADDING
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this.shifted += PADDING
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this.length = length
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this._break = -1
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this._s_i = 0
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this._b_i = 0
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this._e_i = 0
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for i in range(length):
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this._buffer[i] = i
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memset(&this._empty_token, 0, sizeof(TokenC))
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this._empty_token.lex = &EMPTY_LEXEME
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for i in range(length):
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this._sent[i] = sent[i]
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this._buffer[i] = i
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for i in range(length, length + 5):
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this._sent[i].lex = &EMPTY_LEXEME
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__dealloc__():
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cdef int PADDING = 5
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free(this._sent - PADDING)
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free(this._ents - PADDING)
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free(this._buffer - PADDING)
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free(this._stack - PADDING)
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free(this.shifted - PADDING)
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int S(int i) nogil const:
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if i >= this._s_i:
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return -1
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return this._stack[this._s_i - (i+1)]
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int B(int i) nogil const:
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if (i + this._b_i) >= this.length:
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return -1
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return this._buffer[this._b_i + i]
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const TokenC* S_(int i) nogil const:
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return this.safe_get(this.S(i))
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const TokenC* B_(int i) nogil const:
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return this.safe_get(this.B(i))
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const TokenC* H_(int i) nogil const:
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return this.safe_get(this.H(i))
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const TokenC* E_(int i) nogil const:
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return this.safe_get(this.E(i))
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const TokenC* L_(int i, int idx) nogil const:
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return this.safe_get(this.L(i, idx))
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const TokenC* R_(int i, int idx) nogil const:
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return this.safe_get(this.R(i, idx))
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const TokenC* safe_get(int i) nogil const:
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if i < 0 or i >= this.length:
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return &this._empty_token
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else:
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return &this._sent[i]
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int H(int i) nogil const:
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if i < 0 or i >= this.length:
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return -1
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return this._sent[i].head + i
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int E(int i) nogil const:
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if this._e_i <= 0 or this._e_i >= this.length:
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return 0
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if i < 0 or i >= this._e_i:
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return 0
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return this._ents[this._e_i - (i+1)].start
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int L(int i, int idx) nogil const:
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if idx < 1:
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return -1
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if i < 0 or i >= this.length:
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return -1
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cdef const TokenC* target = &this._sent[i]
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if target.l_kids < <uint32_t>idx:
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return -1
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cdef const TokenC* ptr = &this._sent[target.l_edge]
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while ptr < target:
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# If this head is still to the right of us, we can skip to it
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# No token that's between this token and this head could be our
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# child.
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if (ptr.head >= 1) and (ptr + ptr.head) < target:
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ptr += ptr.head
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elif ptr + ptr.head == target:
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idx -= 1
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if idx == 0:
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return ptr - this._sent
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ptr += 1
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else:
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ptr += 1
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return -1
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int R(int i, int idx) nogil const:
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if idx < 1:
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return -1
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if i < 0 or i >= this.length:
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return -1
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cdef const TokenC* target = &this._sent[i]
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if target.r_kids < <uint32_t>idx:
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return -1
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cdef const TokenC* ptr = &this._sent[target.r_edge]
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while ptr > target:
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# If this head is still to the right of us, we can skip to it
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# No token that's between this token and this head could be our
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# child.
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if (ptr.head < 0) and ((ptr + ptr.head) > target):
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ptr += ptr.head
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elif ptr + ptr.head == target:
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idx -= 1
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if idx == 0:
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return ptr - this._sent
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ptr -= 1
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else:
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ptr -= 1
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return -1
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bint empty() nogil const:
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return this._s_i <= 0
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bint eol() nogil const:
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return this.buffer_length() == 0
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bint at_break() nogil const:
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return this._break != -1
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bint is_final() nogil const:
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return this.stack_depth() <= 0 and this._b_i >= this.length
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bint has_head(int i) nogil const:
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return this.safe_get(i).head != 0
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int n_L(int i) nogil const:
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return this.safe_get(i).l_kids
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int n_R(int i) nogil const:
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return this.safe_get(i).r_kids
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bint stack_is_connected() nogil const:
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return False
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bint entity_is_open() nogil const:
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if this._e_i < 1:
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return False
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return this._ents[this._e_i-1].end == -1
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int stack_depth() nogil const:
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return this._s_i
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int buffer_length() nogil const:
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if this._break != -1:
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return this._break - this._b_i
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else:
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return this.length - this._b_i
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void push() nogil:
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if this.B(0) != -1:
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this._stack[this._s_i] = this.B(0)
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this._s_i += 1
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this._b_i += 1
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if this._b_i > this._break:
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this._break = -1
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void pop() nogil:
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if this._s_i >= 1:
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this._s_i -= 1
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void unshift() nogil:
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this._b_i -= 1
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this._buffer[this._b_i] = this.S(0)
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this._s_i -= 1
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this.shifted[this.B(0)] = True
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void add_arc(int head, int child, int label) nogil:
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if this.has_head(child):
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this.del_arc(this.H(child), child)
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cdef int dist = head - child
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this._sent[child].head = dist
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this._sent[child].dep = label
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cdef int i
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if child > head:
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this._sent[head].r_kids += 1
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# Some transition systems can have a word in the buffer have a
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# rightward child, e.g. from Unshift.
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this._sent[head].r_edge = this._sent[child].r_edge
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i = 0
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while this.has_head(head) and i < this.length:
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head = this.H(head)
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this._sent[head].r_edge = this._sent[child].r_edge
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i += 1 # Guard against infinite loops
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else:
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this._sent[head].l_kids += 1
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this._sent[head].l_edge = this._sent[child].l_edge
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void del_arc(int h_i, int c_i) nogil:
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cdef int dist = h_i - c_i
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cdef TokenC* h = &this._sent[h_i]
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cdef int i = 0
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if c_i > h_i:
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# this.R_(h_i, 2) returns the second-rightmost child token of h_i
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# If we have more than 2 rightmost children, our 2nd rightmost child's
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# rightmost edge is going to be our new rightmost edge.
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h.r_edge = this.R_(h_i, 2).r_edge if h.r_kids >= 2 else h_i
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h.r_kids -= 1
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new_edge = h.r_edge
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# Correct upwards in the tree --- see Issue #251
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while h.head < 0 and i < this.length: # Guard infinite loop
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h += h.head
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h.r_edge = new_edge
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i += 1
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else:
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# Same logic applies for left edge, but we don't need to walk up
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# the tree, as the head is off the stack.
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h.l_edge = this.L_(h_i, 2).l_edge if h.l_kids >= 2 else h_i
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h.l_kids -= 1
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void open_ent(int label) nogil:
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this._ents[this._e_i].start = this.B(0)
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this._ents[this._e_i].label = label
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this._ents[this._e_i].end = -1
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this._e_i += 1
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void close_ent() nogil:
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# Note that we don't decrement _e_i here! We want to maintain all
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# entities, not over-write them...
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this._ents[this._e_i-1].end = this.B(0)+1
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this._sent[this.B(0)].ent_iob = 1
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void set_ent_tag(int i, int ent_iob, int ent_type) nogil:
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if 0 <= i < this.length:
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this._sent[i].ent_iob = ent_iob
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this._sent[i].ent_type = ent_type
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void set_break(int i) nogil:
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if 0 <= this.B(0) < this.length:
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this._sent[this.B(0)].sent_start = True
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this._break = this._b_i
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void clone(const StateC* src) nogil:
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memcpy(this._sent, src._sent, this.length * sizeof(TokenC))
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memcpy(this._stack, src._stack, this.length * sizeof(int))
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memcpy(this._buffer, src._buffer, this.length * sizeof(int))
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memcpy(this._ents, src._ents, this.length * sizeof(Entity))
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this._b_i = src._b_i
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this._s_i = src._s_i
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this._e_i = src._e_i
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this._break = src._break
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void fast_forward() nogil:
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# space token attachement policy:
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# - attach space tokens always to the last preceding real token
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# - except if it's the beginning of a sentence, then attach to the first following
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# - boundary case: a document containing multiple space tokens but nothing else,
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# then make the last space token the head of all others
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while is_space_token(this.B_(0)) \
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or this.buffer_length() == 0 \
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or this.stack_depth() == 0:
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if this.buffer_length() == 0:
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# remove the last sentence's root from the stack
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if this.stack_depth() == 1:
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this.pop()
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# parser got stuck: reduce stack or unshift
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elif this.stack_depth() > 1:
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if this.has_head(this.S(0)):
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this.pop()
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else:
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this.unshift()
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# stack is empty but there is another sentence on the buffer
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elif (this.length - this._b_i) >= 1:
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this.push()
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else: # stack empty and nothing else coming
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break
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elif is_space_token(this.B_(0)):
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# the normal case: we're somewhere inside a sentence
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if this.stack_depth() > 0:
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# assert not is_space_token(this.S_(0))
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# attach all coming space tokens to their last preceding
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# real token (which should be on the top of the stack)
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while is_space_token(this.B_(0)):
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this.add_arc(this.S(0),this.B(0),0)
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this.push()
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this.pop()
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# the rare case: we're at the beginning of a document:
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# space tokens are attached to the first real token on the buffer
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elif this.stack_depth() == 0:
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# store all space tokens on the stack until a real token shows up
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# or the last token on the buffer is reached
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while is_space_token(this.B_(0)) and this.buffer_length() > 1:
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this.push()
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# empty the stack by attaching all space tokens to the
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# first token on the buffer
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# boundary case: if all tokens are space tokens, the last one
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# becomes the head of all others
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while this.stack_depth() > 0:
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this.add_arc(this.B(0),this.S(0),0)
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this.pop()
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# move the first token onto the stack
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this.push()
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elif this.stack_depth() == 0:
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# for one token sentences (?)
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if this.buffer_length() == 1:
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this.push()
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this.pop()
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# with an empty stack and a non-empty buffer
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# only shift is valid anyway
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elif (this.length - this._b_i) >= 1:
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this.push()
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else: # can this even happen?
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break
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