70 lines
2.3 KiB
C
70 lines
2.3 KiB
C
/*
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* This file is part of the MicroPython 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) 2013-2016 Damien P. George
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* Copyright (c) 2016 Paul Sokolovsky
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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/lexer.h"
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#if MICROPY_ENABLE_COMPILER
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typedef struct _mp_lexer_str32_buf_t {
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const uint32_t *src_cur;
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uint32_t val;
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uint8_t byte_off;
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} mp_lexer_str32_buf_t;
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STATIC mp_uint_t str32_buf_next_byte(void *sb_in) {
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mp_lexer_str32_buf_t *sb = (mp_lexer_str32_buf_t*)sb_in;
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byte c = sb->val & 0xff;
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if (c == 0) {
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return MP_READER_EOF;
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}
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if (++sb->byte_off > 3) {
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sb->byte_off = 0;
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sb->val = *sb->src_cur++;
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} else {
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sb->val >>= 8;
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}
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return c;
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}
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STATIC void str32_buf_free(void *sb_in) {
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mp_lexer_str32_buf_t *sb = (mp_lexer_str32_buf_t*)sb_in;
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m_del_obj(mp_lexer_str32_buf_t, sb);
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}
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mp_lexer_t *mp_lexer_new_from_str32(qstr src_name, const char *str, mp_uint_t len, mp_uint_t free_len) {
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mp_lexer_str32_buf_t *sb = m_new_obj(mp_lexer_str32_buf_t);
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sb->byte_off = (uint32_t)str & 3;
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sb->src_cur = (uint32_t*)(str - sb->byte_off);
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sb->val = *sb->src_cur++ >> sb->byte_off * 8;
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mp_reader_t reader = {sb, str32_buf_next_byte, str32_buf_free};
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return mp_lexer_new(src_name, reader);
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}
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#endif // MICROPY_ENABLE_COMPILER
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