7d414a1b52
Previous to this patch, a big-int, float or imag constant was interned (made into a qstr) and then parsed at runtime to create an object each time it was needed. This is wasteful in RAM and not efficient. Now, these constants are parsed straight away in the parser and turned into objects. This allows constants with large numbers of digits (so addresses issue #1103) and takes us a step closer to #722.
70 lines
2.3 KiB
C
70 lines
2.3 KiB
C
/*
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* This file is part of the Micro Python project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2013, 2014 Damien P. George
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "py/parsenum.h"
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// find real radix base, and strip preceding '0x', '0o' and '0b'
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// puts base in *base, and returns number of bytes to skip the prefix
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mp_uint_t mp_parse_num_base(const char *str, mp_uint_t len, mp_uint_t *base) {
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const byte *p = (const byte*)str;
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if (len <= 1) {
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goto no_prefix;
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}
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unichar c = *(p++);
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if ((*base == 0 || *base == 16) && c == '0') {
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c = *(p++);
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if ((c | 32) == 'x') {
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*base = 16;
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} else if (*base == 0 && (c | 32) == 'o') {
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*base = 8;
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} else if (*base == 0 && (c | 32) == 'b') {
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*base = 2;
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} else {
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if (*base == 0) {
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*base = 10;
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}
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p -= 2;
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}
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} else if (*base == 8 && c == '0') {
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c = *(p++);
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if ((c | 32) != 'o') {
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p -= 2;
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}
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} else if (*base == 2 && c == '0') {
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c = *(p++);
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if ((c | 32) != 'b') {
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p -= 2;
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}
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} else {
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p--;
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no_prefix:
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if (*base == 0) {
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*base = 10;
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}
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}
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return p - (const byte*)str;
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}
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