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/*
* Copyright © 2012 Ran Benita <ran234@gmail.com>
*
* 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 (including the next
* paragraph) 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.
*/
#ifndef XKBCOMP_SCANNER_UTILS_H
#define XKBCOMP_SCANNER_UTILS_H
/* Point to some substring in the file; used to avoid copying. */
struct sval {
const char *start;
unsigned int len;
};
typedef darray(struct sval) darray_sval;
static inline bool
svaleq(struct sval s1, struct sval s2)
{
return s1.len == s2.len && memcmp(s1.start, s2.start, s1.len) == 0;
}
static inline bool
svaleq_prefix(struct sval s1, struct sval s2)
{
return s1.len <= s2.len && memcmp(s1.start, s2.start, s1.len) == 0;
}
struct scanner {
const char *s;
size_t pos;
size_t len;
char buf[1024];
size_t buf_pos;
size_t line, column;
/* The line/column of the start of the current token. */
size_t token_line, token_column;
const char *file_name;
struct xkb_context *ctx;
void *priv;
};
#define scanner_log_with_code(scanner, level, log_msg_id, fmt, ...) \
xkb_log_with_code((scanner)->ctx, (level), 0, log_msg_id, \
"%s:%zu:%zu: " fmt "\n", \
(scanner)->file_name, \
(scanner)->token_line, \
(scanner)->token_column, ##__VA_ARGS__)
#define scanner_log(scanner, level, fmt, ...) \
xkb_log((scanner)->ctx, (level), 0, \
"%s:%zu:%zu: " fmt "\n", \
(scanner)->file_name, \
(scanner)->token_line, (scanner)->token_column, ##__VA_ARGS__)
#define scanner_err_with_code(scanner, id, fmt, ...) \
scanner_log_with_code(scanner, XKB_LOG_LEVEL_ERROR, id, fmt, ##__VA_ARGS__)
#define scanner_err(scanner, fmt, ...) \
scanner_log(scanner, XKB_LOG_LEVEL_ERROR, fmt, ##__VA_ARGS__)
#define scanner_warn_with_code(scanner, id, fmt, ...) \
scanner_log_with_code(scanner, XKB_LOG_LEVEL_WARNING, id, fmt, ##__VA_ARGS__)
#define scanner_warn(scanner, fmt, ...) \
scanner_log(scanner, XKB_LOG_LEVEL_WARNING, fmt, ##__VA_ARGS__)
static inline void
scanner_init(struct scanner *s, struct xkb_context *ctx,
const char *string, size_t len, const char *file_name,
void *priv)
{
s->s = string;
s->len = len;
s->pos = 0;
s->line = s->column = 1;
s->token_line = s->token_column = 1;
s->file_name = file_name;
s->ctx = ctx;
s->priv = priv;
}
static inline char
scanner_peek(struct scanner *s)
{
if (unlikely(s->pos >= s->len))
return '\0';
return s->s[s->pos];
}
static inline bool
scanner_eof(struct scanner *s)
{
return s->pos >= s->len;
}
static inline bool
scanner_eol(struct scanner *s)
{
return scanner_peek(s) == '\n';
}
static inline void
scanner_skip_to_eol(struct scanner *s)
{
const char *nl = memchr(s->s + s->pos, '\n', s->len - s->pos);
const size_t new_pos = nl ? (size_t) (nl - s->s) : s->len;
s->column += new_pos - s->pos;
s->pos = new_pos;
}
static inline char
scanner_next(struct scanner *s)
{
if (unlikely(scanner_eof(s)))
return '\0';
if (unlikely(scanner_eol(s))) {
s->line++;
s->column = 1;
}
else {
s->column++;
}
return s->s[s->pos++];
}
static inline bool
scanner_chr(struct scanner *s, char ch)
{
if (likely(scanner_peek(s) != ch))
return false;
s->pos++; s->column++;
return true;
}
static inline bool
scanner_str(struct scanner *s, const char *string, size_t len)
{
if (s->len - s->pos < len)
return false;
if (memcmp(s->s + s->pos, string, len) != 0)
return false;
s->pos += len; s->column += len;
return true;
}
#define scanner_lit(s, literal) scanner_str(s, literal, sizeof(literal) - 1)
static inline bool
scanner_buf_append(struct scanner *s, char ch)
{
if (s->buf_pos + 1 >= sizeof(s->buf))
return false;
s->buf[s->buf_pos++] = ch;
return true;
}
static inline bool
scanner_buf_appends(struct scanner *s, const char *str)
{
int ret;
ret = snprintf(s->buf + s->buf_pos, sizeof(s->buf) - s->buf_pos, "%s", str);
if (ret < 0 || (size_t) ret >= sizeof(s->buf) - s->buf_pos)
return false;
s->buf_pos += ret;
return true;
}
static inline bool
scanner_oct(struct scanner *s, uint8_t *out)
{
int i;
for (i = 0, *out = 0; scanner_peek(s) >= '0' && scanner_peek(s) <= '7' && i < 3; i++)
/* Test overflow */
if (*out < 040) {
*out = *out * 8 + scanner_next(s) - '0';
} else {
/* Consume valid digit, but mark result as invalid */
scanner_next(s);
return false;
}
return i > 0;
}
static inline bool
scanner_hex(struct scanner *s, uint8_t *out)
{
int i;
for (i = 0, *out = 0; is_xdigit(scanner_peek(s)) && i < 2; i++) {
const char c = scanner_next(s);
const char offset = (c >= '0' && c <= '9' ? '0' :
c >= 'a' && c <= 'f' ? 'a' - 10 : 'A' - 10);
if (*out * 16 + c >= offset)
*out = *out * 16 + c - offset;
}
return i > 0;
}
#endif
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