in Lexbor use python's heap instead of C's heaps (#205)

* in lexbor use python's heap instead of C's heap as an extra performance enhancement

* Remove bytearray and memoryview typehints from constructor

* fix linting

Author: Vizonex

selectolax/lexbor.pxd

@@ -1,6 +1,5 @@
 from libc.stdint cimport uint8_t, uint32_t, uintptr_t
 
-
 cdef extern from "lexbor/core/core.h" nogil:
     ctypedef uint32_t lxb_codepoint_t
     ctypedef unsigned char lxb_char_t
@@ -32,6 +31,19 @@ cdef extern from "lexbor/core/core.h" nogil:
     lexbor_str_t* lexbor_str_create()
     lxb_char_t * lexbor_str_data_noi(lexbor_str_t *str)
 
+cdef extern from "lexbor/core/lexbor.h" nogil:
+    ctypedef void *(*lexbor_memory_malloc_f)(size_t size) nogil
+    ctypedef void *(*lexbor_memory_realloc_f)(void *dst, size_t size) nogil
+    ctypedef void *(*lexbor_memory_calloc_f)(size_t num, size_t size) nogil
+    ctypedef void (*lexbor_memory_free_f)(void *dst) nogil
+    lxb_status_t lexbor_memory_setup(
+        lexbor_memory_malloc_f new_malloc,
+        lexbor_memory_realloc_f new_realloc,
+        lexbor_memory_calloc_f new_calloc,
+        lexbor_memory_free_f new_free
+    )
+
+
 cdef extern from "lexbor/html/html.h" nogil:
     ctypedef unsigned int lxb_html_document_opt_t
 

selectolax/lexbor.pyx

@@ -1,5 +1,11 @@
 from cpython.bool cimport bool
-
+from cpython.exc cimport PyErr_SetObject
+from cpython.mem cimport (
+    PyMem_RawCalloc,
+    PyMem_RawFree,
+    PyMem_RawMalloc,
+    PyMem_RawRealloc
+)
 _ENCODING = 'UTF-8'
 
 include "base.pxi"
@@ -47,6 +53,7 @@ cdef class LexborHTMLParser:
         """
         cdef size_t html_len
         cdef object bytes_html
+
         self._is_fragment = is_fragment
         self._fragment_document = NULL
         self._selector = None
@@ -752,3 +759,17 @@ cdef class LexborHTMLParser:
         dom_node = <lxb_dom_node_t *> element
 
         return LexborNode.new(dom_node, self)
+
+# Putting lexbor on python's heap is better than putting it
+# onto C's Heap, because python's Garbage collector can collect
+# this memory after use and has the bonus of gaining access to
+# mimalloc which python uses under the hood...
+if lexbor_memory_setup(
+    PyMem_RawMalloc,
+    PyMem_RawRealloc,
+    PyMem_RawCalloc,
+    PyMem_RawFree
+) != LXB_STATUS_OK:
+    # This will almost never happen due to the code in both the windows and posix versions
+    # but if something were to happen this excecption on import should be triggered...
+    raise SelectolaxError("Can't initalize allocators from lexbor_memory_setup(...)")