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#include <assert.h>
#include <errno.h>
#include <inttypes.h>
#include <limits.h>
#include <stdalign.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include "alloc.h"
#include "errors.h"
#include "lexer.h"
#include "unicode.h"
#if DEBUG
# define LEXEMES_DFLT_CAP (8)
#else
# define LEXEMES_DFLT_CAP (2048)
#endif
#define SIZE_WDTH (sizeof(size_t) * CHAR_BIT)
static bool skip_comment(const uchar **, const uchar *);
static struct lexemes mklexemes(void);
static void lexemesresz(struct lexemes *);
static const bool is_numeric_lookup[UCHAR_MAX + 1] = {
['0'] = true, ['1'] = true, ['2'] = true, ['3'] = true,
['4'] = true, ['5'] = true, ['6'] = true, ['7'] = true,
['8'] = true, ['9'] = true, ['\''] = true,
};
struct lexemes
lexstring(const uchar *code, size_t codesz)
{
#if ORYX_SIMD
if (!utf8_validate_simd(code, codesz)) {
#endif
size_t loc = utf8_validate_off(code, codesz);
if (loc != 0) {
err("Invalid byte ‘0x%02" PRIx8 "’ in UTF-8 input at byte %zu",
code[loc - 1], loc);
}
#if ORYX_SIMD
}
#endif
struct lexemes data = mklexemes();
const uchar *start = code, *end = start + codesz;
while (likely(code < end)) {
const uchar *spnbeg = code, *spnend;
rune ch = utf8_decode(&code);
switch (ch) {
/* Single-byte literals */
case '&': case '(': case ')': case '*': case '+':
case '-': case ':': case ';': case '=': case '[':
case ']': case '{': case '|': case '}': case '~':
data.kinds[data.len++] = ch;
break;
/* Single- or double-byte literals */
case '/':
if (code < end && code[0] == '*') {
if (!skip_comment(&code, end))
err("Unterminated comment at byte %td", code - start);
continue;
}
data.kinds[data.len++] = ch;
break;
case '<':
case '>':
data.kinds[data.len++] = ch;
/* See the comment in lexer.h for where 193 comes from */
if (code < end && code[0] == ch) {
code++;
data.kinds[data.len - 1] += 193;
}
break;
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
data.kinds[data.len] = LEXNUM;
data.strs[data.len].p = spnbeg;
while (likely(code < end) && is_numeric_lookup[code[0]]) {
if (unlikely(code[0] == '\'' && code[-1] == '\'')) {
err("Adjacent numeric separators at byte %td",
code - start);
}
code++;
}
if (unlikely(code < end && code[-1] == '\'')) {
err("Numeric literal ends with numeric separator at byte %td",
code - start);
}
data.strs[data.len++].len = code - spnbeg;
break;
default:
if (!rune_is_xids(ch))
continue;
data.kinds[data.len] = LEXIDENT;
data.strs[data.len].p = spnbeg;
spnend = code;
while (likely(code < end) && rune_is_xidc(ch)) {
spnend = code;
ch = utf8_decode(&code);
}
if (likely(code < end))
code = spnend;
data.strs[data.len++].len = spnend - spnbeg;
}
if (unlikely(data.len == data.cap))
lexemesresz(&data);
}
if (unlikely(data.len == data.cap))
lexemesresz(&data);
data.kinds[data.len++] = LEXEOF;
return data;
}
bool
skip_comment(const uchar **ptr, const uchar *end)
{
int nst = 1;
const uchar *p = *ptr;
for (p++; likely(p < end); p++) {
if (p + 1 < end) {
if (p[0] == '*' && p[1] == '/') {
p++;
if (--nst == 0)
goto out;
} else if (p[0] == '/' && p[1] == '*') {
p++;
nst++;
}
}
}
return false;
out:
*ptr = ++p;
return true;
}
struct lexemes
mklexemes(void)
{
struct lexemes soa;
static_assert(offsetof(struct lexemes, kinds)
< offsetof(struct lexemes, strs),
"KINDS is not the first field before STRS");
static_assert(LEXEMES_DFLT_CAP * sizeof(*soa.kinds) % alignof(*soa.strs)
== 0,
"Additional padding is required to properly align STRS");
soa.len = 0;
soa.cap = LEXEMES_DFLT_CAP;
soa.kinds = bufalloc(NULL, soa.cap, LEXEMES_BLKSZ);
soa.strs = (void *)((char *)soa.kinds + soa.cap * sizeof(*soa.kinds));
return soa;
}
void
lexemesresz(struct lexemes *soa)
{
static_assert(offsetof(struct lexemes, kinds)
< offsetof(struct lexemes, strs),
"KINDS is not the first field before STRS");
size_t ncap, pad, newsz;
ptrdiff_t off = (char *)soa->strs - (char *)soa->kinds;
/* The capacity is always going to be a power of 2, so checking for overflow
becomes pretty trivial */
if ((soa->cap >> (SIZE_WDTH - 1)) != 0) {
errno = EOVERFLOW;
err("%s:", __func__);
}
ncap = soa->cap << 1;
/* Ensure that soa->strs is properly aligned */
pad = alignof(*soa->strs)
- ncap * sizeof(*soa->kinds) % alignof(*soa->strs);
if (pad == alignof(*soa->strs))
pad = 0;
newsz = ncap * LEXEMES_BLKSZ + pad;
soa->kinds = bufalloc(soa->kinds, newsz, 1);
soa->strs = (void *)((char *)soa->kinds + ncap * sizeof(*soa->kinds) + pad);
memmove(soa->strs, (char *)soa->kinds + off, soa->len * sizeof(*soa->strs));
soa->cap = ncap;
}
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