2 * *****************************************************************************
4 * SPDX-License-Identifier: BSD-2-Clause
6 * Copyright (c) 2018-2020 Gavin D. Howard and contributors.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions are met:
11 * * Redistributions of source code must retain the above copyright notice, this
12 * list of conditions and the following disclaimer.
14 * * Redistributions in binary form must reproduce the above copyright notice,
15 * this list of conditions and the following disclaimer in the documentation
16 * and/or other materials provided with the distribution.
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
28 * POSSIBILITY OF SUCH DAMAGE.
30 * *****************************************************************************
43 bool dc_lex_negCommand(BcLex *l) {
44 char c = l->buf[l->i];
45 return !BC_LEX_NUM_CHAR(c, false, false);
48 static void dc_lex_register(BcLex *l) {
50 if (DC_X && isspace(l->buf[l->i - 1])) {
57 if (!isalnum(c) && c != '_')
58 bc_lex_verr(l, BC_ERR_PARSE_CHAR, c);
64 bc_vec_npop(&l->str, l->str.len);
65 bc_vec_pushByte(&l->str, (uchar) l->buf[l->i - 1]);
66 bc_vec_pushByte(&l->str, '\0');
71 static void dc_lex_string(BcLex *l) {
73 size_t depth = 1, nls = 0, i = l->i;
77 bc_vec_npop(&l->str, l->str.len);
79 for (; (c = l->buf[i]) && depth; ++i) {
92 if (depth) bc_vec_push(&l->str, &c);
95 if (BC_ERR(c == '\0' && depth)) {
97 bc_lex_err(l, BC_ERR_PARSE_STRING);
100 bc_vec_pushByte(&l->str, '\0');
106 void dc_lex_token(BcLex *l) {
108 char c = l->buf[l->i++], c2;
111 for (i = 0; i < dc_lex_regs_len; ++i) {
112 if (l->last == dc_lex_regs[i]) {
118 if (c >= '"' && c <= '~' &&
119 (l->t = dc_lex_tokens[(c - '"')]) != BC_LEX_INVALID)
124 // This is the workhorse of the lexer.
135 bc_lex_commonTokens(l, c);
143 if (c2 == '=') l->t = BC_LEX_OP_REL_NE;
144 else if (c2 == '<') l->t = BC_LEX_OP_REL_LE;
145 else if (c2 == '>') l->t = BC_LEX_OP_REL_GE;
146 else bc_lex_invalidChar(l, c);
154 bc_lex_lineComment(l);
161 if (BC_NO_ERR(BC_LEX_NUM_CHAR(c2, true, false)))
163 else bc_lex_invalidChar(l, c);
196 bc_lex_invalidChar(l, c);