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/*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* Copyright (C) 2018 Blender Foundation.
*/
/** \file \ingroup DNA
*
* Utilities for stand-alone makesdna.c and Blender to share.
*/
#include <string.h>
#include "BLI_sys_types.h"
#include "BLI_utildefines.h"
#include "BLI_assert.h"
#include "BLI_memarena.h"
#include "dna_utils.h"
/* -------------------------------------------------------------------- */
/** \name Struct Member Evaluation
* \{ */
/**
* Parses the `[n1][n2]...` on the end of an array name
* and returns the number of array elements `n1 * n2 ...`.
*/
int DNA_elem_array_size(const char *str)
{
int result = 1;
int current = 0;
while (true) {
char c = *str++;
switch (c) {
case '\0':
return result;
case '[':
current = 0;
break;
case ']':
result *= current;
break;
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
current = current * 10 + (c - '0');
break;
default:
break;
}
}
}
/** \} */
/* -------------------------------------------------------------------- */
/** \name Struct Member Manipulation
* \{ */
static bool is_identifier(const char c)
{
return ((c >= 'a' && c <= 'z') ||
(c >= 'A' && c <= 'Z') ||
(c >= '0' && c <= '9') ||
(c == '_'));
}
uint DNA_elem_id_offset_start(const char *elem_full)
{
uint elem_full_offset = 0;
while (!is_identifier(elem_full[elem_full_offset])) {
elem_full_offset++;
}
return elem_full_offset;
}
uint DNA_elem_id_offset_end(const char *elem_full)
{
uint elem_full_offset = 0;
while (is_identifier(elem_full[elem_full_offset])) {
elem_full_offset++;
}
return elem_full_offset;
}
/**
* \a elem_dst must be at least the size of \a elem_src.
*/
uint DNA_elem_id_strip_copy(char *elem_dst, const char *elem_src)
{
const uint elem_src_offset = DNA_elem_id_offset_start(elem_src);
const char *elem_src_trim = elem_src + elem_src_offset;
const uint elem_src_trim_len = DNA_elem_id_offset_end(elem_src_trim);
memcpy(elem_dst, elem_src_trim, elem_src_trim_len);
elem_dst[elem_src_trim_len] = '\0';
return elem_src_trim_len;
}
uint DNA_elem_id_strip(char *elem)
{
const uint elem_offset = DNA_elem_id_offset_start(elem);
const char *elem_trim = elem + elem_offset;
const uint elem_trim_len = DNA_elem_id_offset_end(elem_trim);
memmove(elem, elem_trim, elem_trim_len);
elem[elem_trim_len] = '\0';
return elem_trim_len;
}
/**
* Check if 'var' matches '*var[3]' for eg,
* return true if it does, with start/end offsets.
*/
bool DNA_elem_id_match(
const char *elem_search, const int elem_search_len,
const char *elem_full,
uint *r_elem_full_offset)
{
BLI_assert(strlen(elem_search) == elem_search_len);
const uint elem_full_offset = DNA_elem_id_offset_start(elem_full);
const char *elem_full_trim = elem_full + elem_full_offset;
if (strncmp(elem_search, elem_full_trim, elem_search_len) == 0) {
const char c = elem_full_trim[elem_search_len];
if (c == '\0' || !is_identifier(c)) {
*r_elem_full_offset = elem_full_offset;
return true;
}
}
return false;
}
/**
* Return a renamed dna name, allocated from \a mem_arena.
*/
char *DNA_elem_id_rename(
struct MemArena *mem_arena,
const char *elem_src, const int elem_src_len,
const char *elem_dst, const int elem_dst_len,
const char *elem_src_full, const int elem_src_full_len,
const uint elem_src_full_offset_len)
{
BLI_assert(strlen(elem_src) == elem_src_len);
BLI_assert(strlen(elem_dst) == elem_dst_len);
BLI_assert(strlen(elem_src_full) == elem_src_full_len);
BLI_assert(DNA_elem_id_offset_start(elem_src_full) == elem_src_full_offset_len);
UNUSED_VARS_NDEBUG(elem_src);
const int elem_final_len = (elem_src_full_len - elem_src_len) + elem_dst_len;
char *elem_dst_full = BLI_memarena_alloc(mem_arena, elem_final_len + 1);
uint i = 0;
if (elem_src_full_offset_len != 0) {
memcpy(elem_dst_full, elem_src_full, elem_src_full_offset_len);
i = elem_src_full_offset_len;
}
memcpy(&elem_dst_full[i], elem_dst, elem_dst_len + 1);
i += elem_dst_len;
uint elem_src_full_offset_end = elem_src_full_offset_len + elem_src_len;
if (elem_src_full[elem_src_full_offset_end] != '\0') {
const int elem_full_tail_len = (elem_src_full_len - elem_src_full_offset_end);
memcpy(&elem_dst_full[i], &elem_src_full[elem_src_full_offset_end], elem_full_tail_len + 1);
i += elem_full_tail_len;
}
BLI_assert((strlen(elem_dst_full) == elem_final_len) && (i == elem_final_len));
return elem_dst_full;
}
/** \} */
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