djsundog
/
circuitpython
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
circuitpython/py/objdict.c

592 lines
20 KiB
C
Raw Blame History

/*
* This file is part of the Micro Python project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2013, 2014 Damien P. George
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <stdbool.h>
#include <string.h>
#include <assert.h>
#include "mpconfig.h"
#include "nlr.h"
#include "misc.h"
#include "qstr.h"
#include "obj.h"
#include "objtuple.h"
#include "runtime0.h"
#include "runtime.h"
#include "builtin.h"
STATIC mp_obj_t mp_obj_new_dict_iterator(mp_obj_dict_t *dict, int cur);
STATIC mp_map_elem_t *dict_it_iternext_elem(mp_obj_t self_in);
STATIC mp_obj_t dict_update(uint n_args, const mp_obj_t *args, mp_map_t *kwargs);
STATIC void dict_print(void (*print)(void *env, const char *fmt, ...), void *env, mp_obj_t self_in, mp_print_kind_t kind) {
mp_obj_dict_t *self = self_in;
bool first = true;
print(env, "{");
mp_obj_t *dict_iter = mp_obj_new_dict_iterator(self, 0);
mp_map_elem_t *next = NULL;
while ((next = dict_it_iternext_elem(dict_iter)) != MP_OBJ_STOP_ITERATION) {
if (!first) {
print(env, ", ");
}
first = false;
mp_obj_print_helper(print, env, next->key, PRINT_REPR);
print(env, ": ");
mp_obj_print_helper(print, env, next->value, PRINT_REPR);
}
print(env, "}");
}
STATIC mp_obj_t dict_make_new(mp_obj_t type_in, uint n_args, uint n_kw, const mp_obj_t *args) {
mp_obj_t dict = mp_obj_new_dict(0);
if (n_args > 0 || n_kw > 0) {
mp_obj_t args2[2] = {dict, args[0]}; // args[0] is always valid, even if it's not a positional arg
mp_map_t kwargs;
mp_map_init_fixed_table(&kwargs, n_kw, args + n_args);
dict_update(n_args + 1, args2, &kwargs); // dict_update will check that n_args + 1 == 1 or 2
}
return dict;
}
STATIC mp_obj_t dict_unary_op(int op, mp_obj_t self_in) {
mp_obj_dict_t *self = self_in;
switch (op) {
case MP_UNARY_OP_BOOL: return MP_BOOL(self->map.used != 0);
case MP_UNARY_OP_LEN: return MP_OBJ_NEW_SMALL_INT(self->map.used);
default: return MP_OBJ_NULL; // op not supported
}
}
STATIC mp_obj_t dict_binary_op(int op, mp_obj_t lhs_in, mp_obj_t rhs_in) {
mp_obj_dict_t *o = lhs_in;
switch (op) {
case MP_BINARY_OP_IN: {
mp_map_elem_t *elem = mp_map_lookup(&o->map, rhs_in, MP_MAP_LOOKUP);
return MP_BOOL(elem != NULL);
}
case MP_BINARY_OP_EQUAL: {
if (MP_OBJ_IS_TYPE(rhs_in, &mp_type_dict)) {
mp_obj_dict_t *rhs = rhs_in;
if (o->map.used != rhs->map.used) {
return mp_const_false;
}
mp_uint_t size = o->map.alloc;
mp_map_t *map = &o->map;
for (mp_uint_t i = 0; i < size; i++) {
if (MP_MAP_SLOT_IS_FILLED(map, i)) {
mp_map_elem_t *elem = mp_map_lookup(&rhs->map, map->table[i].key, MP_MAP_LOOKUP);
if (elem == NULL || !mp_obj_equal(map->table[i].value, elem->value)) {
return mp_const_false;
}
}
}
return mp_const_true;
} else {
// dict is not equal to instance of any other type
return mp_const_false;
}
}
default:
// op not supported
return MP_OBJ_NULL;
}
}
// TODO: Make sure this is inlined in dict_subscr() below.
mp_obj_t mp_obj_dict_get(mp_obj_t self_in, mp_obj_t index) {
mp_obj_dict_t *self = self_in;
mp_map_elem_t *elem = mp_map_lookup(&self->map, index, MP_MAP_LOOKUP);
if (elem == NULL) {
nlr_raise(mp_obj_new_exception_msg(&mp_type_KeyError, "<value>"));
} else {
return elem->value;
}
}
STATIC mp_obj_t dict_subscr(mp_obj_t self_in, mp_obj_t index, mp_obj_t value) {
if (value == MP_OBJ_NULL) {
// delete
mp_obj_dict_delete(self_in, index);
return mp_const_none;
} else if (value == MP_OBJ_SENTINEL) {
// load
mp_obj_dict_t *self = self_in;
mp_map_elem_t *elem = mp_map_lookup(&self->map, index, MP_MAP_LOOKUP);
if (elem == NULL) {
nlr_raise(mp_obj_new_exception_msg(&mp_type_KeyError, "<value>"));
} else {
return elem->value;
}
} else {
// store
mp_obj_dict_store(self_in, index, value);
return mp_const_none;
}
}
/******************************************************************************/
/* dict iterator */
typedef struct _mp_obj_dict_it_t {
mp_obj_base_t base;
mp_obj_dict_t *dict;
mp_uint_t cur;
} mp_obj_dict_it_t;
STATIC mp_map_elem_t *dict_it_iternext_elem(mp_obj_t self_in) {
mp_obj_dict_it_t *self = self_in;
mp_uint_t max = self->dict->map.alloc;
mp_map_t *map = &self->dict->map;
for (int i = self->cur; i < max; i++) {
if (MP_MAP_SLOT_IS_FILLED(map, i)) {
self->cur = i + 1;
return &(map->table[i]);
}
}
return MP_OBJ_STOP_ITERATION;
}
mp_obj_t dict_it_iternext(mp_obj_t self_in) {
mp_map_elem_t *next = dict_it_iternext_elem(self_in);
if (next != MP_OBJ_STOP_ITERATION) {
return next->key;
} else {
return MP_OBJ_STOP_ITERATION;
}
}
STATIC const mp_obj_type_t mp_type_dict_it = {
{ &mp_type_type },
.name = MP_QSTR_iterator,
.getiter = mp_identity,
.iternext = dict_it_iternext,
};
STATIC mp_obj_t mp_obj_new_dict_iterator(mp_obj_dict_t *dict, int cur) {
mp_obj_dict_it_t *o = m_new_obj(mp_obj_dict_it_t);
o->base.type = &mp_type_dict_it;
o->dict = dict;
o->cur = cur;
return o;
}
STATIC mp_obj_t dict_getiter(mp_obj_t o_in) {
return mp_obj_new_dict_iterator(o_in, 0);
}
/******************************************************************************/
/* dict methods */
STATIC mp_obj_t dict_clear(mp_obj_t self_in) {
assert(MP_OBJ_IS_TYPE(self_in, &mp_type_dict));
mp_obj_dict_t *self = self_in;
mp_map_clear(&self->map);
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(dict_clear_obj, dict_clear);
STATIC mp_obj_t dict_copy(mp_obj_t self_in) {
assert(MP_OBJ_IS_TYPE(self_in, &mp_type_dict));
mp_obj_dict_t *self = self_in;
mp_obj_dict_t *other = mp_obj_new_dict(self->map.alloc);
other->map.used = self->map.used;
other->map.all_keys_are_qstrs = self->map.all_keys_are_qstrs;
other->map.table_is_fixed_array = 0;
memcpy(other->map.table, self->map.table, self->map.alloc * sizeof(mp_map_elem_t));
return other;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(dict_copy_obj, dict_copy);
// this is a classmethod
STATIC mp_obj_t dict_fromkeys(uint n_args, const mp_obj_t *args) {
assert(2 <= n_args && n_args <= 3);
mp_obj_t iter = mp_getiter(args[1]);
mp_obj_t len = mp_obj_len_maybe(iter);
mp_obj_t value = mp_const_none;
mp_obj_t next = NULL;
mp_obj_dict_t *self = NULL;
if (n_args > 2) {
value = args[2];
}
if (len == MP_OBJ_NULL) {
/* object's type doesn't have a __len__ slot */
self = mp_obj_new_dict(0);
} else {
self = mp_obj_new_dict(MP_OBJ_SMALL_INT_VALUE(len));
}
while ((next = mp_iternext(iter)) != MP_OBJ_STOP_ITERATION) {
mp_map_lookup(&self->map, next, MP_MAP_LOOKUP_ADD_IF_NOT_FOUND)->value = value;
}
return self;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(dict_fromkeys_fun_obj, 2, 3, dict_fromkeys);
STATIC MP_DEFINE_CONST_CLASSMETHOD_OBJ(dict_fromkeys_obj, (const mp_obj_t)&dict_fromkeys_fun_obj);
STATIC mp_obj_t dict_get_helper(mp_map_t *self, mp_obj_t key, mp_obj_t deflt, mp_map_lookup_kind_t lookup_kind) {
mp_map_elem_t *elem = mp_map_lookup(self, key, lookup_kind);
mp_obj_t value;
if (elem == NULL || elem->value == NULL) {
if (deflt == NULL) {
if (lookup_kind == MP_MAP_LOOKUP_REMOVE_IF_FOUND) {
nlr_raise(mp_obj_new_exception_msg(&mp_type_KeyError, "<value>"));
} else {
value = mp_const_none;
}
} else {
value = deflt;
}
} else {
value = elem->value;
}
if (lookup_kind == MP_MAP_LOOKUP_ADD_IF_NOT_FOUND) {
elem->value = value;
}
return value;
}
STATIC mp_obj_t dict_get(uint n_args, const mp_obj_t *args) {
assert(2 <= n_args && n_args <= 3);
assert(MP_OBJ_IS_TYPE(args[0], &mp_type_dict));
return dict_get_helper(&((mp_obj_dict_t *)args[0])->map,
args[1],
n_args == 3 ? args[2] : NULL,
MP_MAP_LOOKUP);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(dict_get_obj, 2, 3, dict_get);
STATIC mp_obj_t dict_pop(uint n_args, const mp_obj_t *args) {
assert(2 <= n_args && n_args <= 3);
assert(MP_OBJ_IS_TYPE(args[0], &mp_type_dict));
return dict_get_helper(&((mp_obj_dict_t *)args[0])->map,
args[1],
n_args == 3 ? args[2] : NULL,
MP_MAP_LOOKUP_REMOVE_IF_FOUND);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(dict_pop_obj, 2, 3, dict_pop);
STATIC mp_obj_t dict_setdefault(uint n_args, const mp_obj_t *args) {
assert(2 <= n_args && n_args <= 3);
assert(MP_OBJ_IS_TYPE(args[0], &mp_type_dict));
return dict_get_helper(&((mp_obj_dict_t *)args[0])->map,
args[1],
n_args == 3 ? args[2] : NULL,
MP_MAP_LOOKUP_ADD_IF_NOT_FOUND);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(dict_setdefault_obj, 2, 3, dict_setdefault);
STATIC mp_obj_t dict_popitem(mp_obj_t self_in) {
assert(MP_OBJ_IS_TYPE(self_in, &mp_type_dict));
mp_obj_dict_t *self = self_in;
if (self->map.used == 0) {
nlr_raise(mp_obj_new_exception_msg(&mp_type_KeyError, "popitem(): dictionary is empty"));
}
mp_obj_dict_it_t *iter = mp_obj_new_dict_iterator(self, 0);
mp_map_elem_t *next = dict_it_iternext_elem(iter);
self->map.used--;
mp_obj_t items[] = {next->key, next->value};
next->key = NULL;
next->value = NULL;
mp_obj_t tuple = mp_obj_new_tuple(2, items);
return tuple;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(dict_popitem_obj, dict_popitem);
STATIC mp_obj_t dict_update(uint n_args, const mp_obj_t *args, mp_map_t *kwargs) {
assert(MP_OBJ_IS_TYPE(args[0], &mp_type_dict));
mp_obj_dict_t *self = args[0];
mp_arg_check_num(n_args, kwargs->used, 1, 2, true);
if (n_args == 2) {
// given a positional argument
if (MP_OBJ_IS_TYPE(args[1], &mp_type_dict)) {
// update from other dictionary (make sure other is not self)
if (args[1] != self) {
// TODO don't allocate heap object for this iterator
mp_obj_t *dict_iter = mp_obj_new_dict_iterator(args[1], 0);
mp_map_elem_t *elem = NULL;
while ((elem = dict_it_iternext_elem(dict_iter)) != MP_OBJ_STOP_ITERATION) {
mp_map_lookup(&self->map, elem->key, MP_MAP_LOOKUP_ADD_IF_NOT_FOUND)->value = elem->value;
}
}
} else {
// update from a generic iterable of pairs
mp_obj_t iter = mp_getiter(args[1]);
mp_obj_t next = NULL;
while ((next = mp_iternext(iter)) != MP_OBJ_STOP_ITERATION) {
mp_obj_t inneriter = mp_getiter(next);
mp_obj_t key = mp_iternext(inneriter);
mp_obj_t value = mp_iternext(inneriter);
mp_obj_t stop = mp_iternext(inneriter);
if (key == MP_OBJ_STOP_ITERATION
|| value == MP_OBJ_STOP_ITERATION
|| stop != MP_OBJ_STOP_ITERATION) {
nlr_raise(mp_obj_new_exception_msg(
&mp_type_ValueError,
"dictionary update sequence has the wrong length"));
} else {
mp_map_lookup(&self->map, key, MP_MAP_LOOKUP_ADD_IF_NOT_FOUND)->value = value;
}
}
}
}
// update the dict with any keyword args
for (mp_uint_t i = 0; i < kwargs->alloc; i++) {
if (MP_MAP_SLOT_IS_FILLED(kwargs, i)) {
mp_map_lookup(&self->map, kwargs->table[i].key, MP_MAP_LOOKUP_ADD_IF_NOT_FOUND)->value = kwargs->table[i].value;
}
}
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_KW(dict_update_obj, 1, dict_update);
/******************************************************************************/
/* dict views */
STATIC const mp_obj_type_t dict_view_type;
STATIC const mp_obj_type_t dict_view_it_type;
typedef enum _mp_dict_view_kind_t {
MP_DICT_VIEW_ITEMS,
MP_DICT_VIEW_KEYS,
MP_DICT_VIEW_VALUES,
} mp_dict_view_kind_t;
STATIC char *mp_dict_view_names[] = {"dict_items", "dict_keys", "dict_values"};
typedef struct _mp_obj_dict_view_it_t {
mp_obj_base_t base;
mp_dict_view_kind_t kind;
mp_obj_dict_it_t *iter;
mp_uint_t cur;
} mp_obj_dict_view_it_t;
typedef struct _mp_obj_dict_view_t {
mp_obj_base_t base;
mp_obj_dict_t *dict;
mp_dict_view_kind_t kind;
} mp_obj_dict_view_t;
STATIC mp_obj_t dict_view_it_iternext(mp_obj_t self_in) {
assert(MP_OBJ_IS_TYPE(self_in, &dict_view_it_type));
mp_obj_dict_view_it_t *self = self_in;
mp_map_elem_t *next = dict_it_iternext_elem(self->iter);
if (next != MP_OBJ_STOP_ITERATION) {
switch (self->kind) {
case MP_DICT_VIEW_ITEMS:
{
mp_obj_t items[] = {next->key, next->value};
return mp_obj_new_tuple(2, items);
}
case MP_DICT_VIEW_KEYS:
return next->key;
case MP_DICT_VIEW_VALUES:
return next->value;
default:
assert(0); /* can't happen */
return mp_const_none;
}
} else {
return MP_OBJ_STOP_ITERATION;
}
}
STATIC const mp_obj_type_t dict_view_it_type = {
{ &mp_type_type },
.name = MP_QSTR_iterator,
.getiter = mp_identity,
.iternext = dict_view_it_iternext,
};
STATIC mp_obj_t dict_view_getiter(mp_obj_t view_in) {
assert(MP_OBJ_IS_TYPE(view_in, &dict_view_type));
mp_obj_dict_view_t *view = view_in;
mp_obj_dict_view_it_t *o = m_new_obj(mp_obj_dict_view_it_t);
o->base.type = &dict_view_it_type;
o->kind = view->kind;
o->iter = mp_obj_new_dict_iterator(view->dict, 0);
return o;
}
STATIC void dict_view_print(void (*print)(void *env, const char *fmt, ...), void *env, mp_obj_t self_in, mp_print_kind_t kind) {
assert(MP_OBJ_IS_TYPE(self_in, &dict_view_type));
mp_obj_dict_view_t *self = self_in;
bool first = true;
print(env, mp_dict_view_names[self->kind]);
print(env, "([");
mp_obj_t *self_iter = dict_view_getiter(self);
mp_obj_t *next = NULL;
while ((next = dict_view_it_iternext(self_iter)) != MP_OBJ_STOP_ITERATION) {
if (!first) {
print(env, ", ");
}
first = false;
mp_obj_print_helper(print, env, next, PRINT_REPR);
}
print(env, "])");
}
STATIC mp_obj_t dict_view_binary_op(int op, mp_obj_t lhs_in, mp_obj_t rhs_in) {
// only supported for the 'keys' kind until sets and dicts are refactored
mp_obj_dict_view_t *o = lhs_in;
if (o->kind != MP_DICT_VIEW_KEYS) {
return MP_OBJ_NULL; // op not supported
}
if (op != MP_BINARY_OP_IN) {
return MP_OBJ_NULL; // op not supported
}
return dict_binary_op(op, o->dict, rhs_in);
}
STATIC const mp_obj_type_t dict_view_type = {
{ &mp_type_type },
.name = MP_QSTR_dict_view,
.print = dict_view_print,
.binary_op = dict_view_binary_op,
.getiter = dict_view_getiter,
};
mp_obj_t mp_obj_new_dict_view(mp_obj_dict_t *dict, mp_dict_view_kind_t kind) {
mp_obj_dict_view_t *o = m_new_obj(mp_obj_dict_view_t);
o->base.type = &dict_view_type;
o->dict = dict;
o->kind = kind;
return o;
}
STATIC mp_obj_t dict_view(mp_obj_t self_in, mp_dict_view_kind_t kind) {
assert(MP_OBJ_IS_TYPE(self_in, &mp_type_dict));
mp_obj_dict_t *self = self_in;
return mp_obj_new_dict_view(self, kind);
}
STATIC mp_obj_t dict_items(mp_obj_t self_in) {
return dict_view(self_in, MP_DICT_VIEW_ITEMS);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(dict_items_obj, dict_items);
STATIC mp_obj_t dict_keys(mp_obj_t self_in) {
return dict_view(self_in, MP_DICT_VIEW_KEYS);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(dict_keys_obj, dict_keys);
STATIC mp_obj_t dict_values(mp_obj_t self_in) {
return dict_view(self_in, MP_DICT_VIEW_VALUES);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(dict_values_obj, dict_values);
/******************************************************************************/
/* dict constructors & public C API */
STATIC const mp_map_elem_t dict_locals_dict_table[] = {
{ MP_OBJ_NEW_QSTR(MP_QSTR_clear), (mp_obj_t)&dict_clear_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_copy), (mp_obj_t)&dict_copy_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_fromkeys), (mp_obj_t)&dict_fromkeys_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_get), (mp_obj_t)&dict_get_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_items), (mp_obj_t)&dict_items_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_keys), (mp_obj_t)&dict_keys_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_pop), (mp_obj_t)&dict_pop_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_popitem), (mp_obj_t)&dict_popitem_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_setdefault), (mp_obj_t)&dict_setdefault_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_update), (mp_obj_t)&dict_update_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_values), (mp_obj_t)&dict_values_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR___getitem__), (mp_obj_t)&mp_op_getitem_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR___setitem__), (mp_obj_t)&mp_op_setitem_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR___delitem__), (mp_obj_t)&mp_op_delitem_obj },
};
STATIC MP_DEFINE_CONST_DICT(dict_locals_dict, dict_locals_dict_table);
const mp_obj_type_t mp_type_dict = {
{ &mp_type_type },
.name = MP_QSTR_dict,
.print = dict_print,
.make_new = dict_make_new,
.unary_op = dict_unary_op,
.binary_op = dict_binary_op,
.subscr = dict_subscr,
.getiter = dict_getiter,
.locals_dict = (mp_obj_t)&dict_locals_dict,
};
void mp_obj_dict_init(mp_obj_dict_t *dict, int n_args) {
dict->base.type = &mp_type_dict;
mp_map_init(&dict->map, n_args);
}
mp_obj_t mp_obj_new_dict(int n_args) {
mp_obj_dict_t *o = m_new_obj(mp_obj_dict_t);
mp_obj_dict_init(o, n_args);
return o;
}
uint mp_obj_dict_len(mp_obj_t self_in) {
return ((mp_obj_dict_t *)self_in)->map.used;
}
mp_obj_t mp_obj_dict_store(mp_obj_t self_in, mp_obj_t key, mp_obj_t value) {
assert(MP_OBJ_IS_TYPE(self_in, &mp_type_dict));
mp_obj_dict_t *self = self_in;
mp_map_lookup(&self->map, key, MP_MAP_LOOKUP_ADD_IF_NOT_FOUND)->value = value;
return self_in;
}
mp_obj_t mp_obj_dict_delete(mp_obj_t self_in, mp_obj_t key) {
assert(MP_OBJ_IS_TYPE(self_in, &mp_type_dict));
mp_obj_dict_t *self = self_in;
dict_get_helper(&self->map, key, NULL, MP_MAP_LOOKUP_REMOVE_IF_FOUND);
return self_in;
}
mp_map_t *mp_obj_dict_get_map(mp_obj_t self_in) {
assert(MP_OBJ_IS_TYPE(self_in, &mp_type_dict));
mp_obj_dict_t *self = self_in;
return &self->map;
}
Reference in New Issue View Git Blame Copy Permalink