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#include <stdarg.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "util.h"
#include "pp.h"
#include "scan.h"
#include "token.h"
static struct token pending;
static void
keyword(struct token *tok)
{
static const struct {
const char *name;
int value;
} keywords[] = {
{"_Alignas", T_ALIGNAS},
{"_Alignof", T_ALIGNOF},
{"_Atomic", T_ATOMIC},
{"_Bool", T_BOOL},
{"_Complex", T_COMPLEX},
{"_Generic", T_GENERIC},
{"_Imaginary", T_IMAGINARY},
{"_Noreturn", T_NORETURN},
{"_Static_assert", T_STATIC_ASSERT},
{"_Thread_local", T_THREAD_LOCAL},
{"__typeof__", T__TYPEOF__},
{"auto", TAUTO},
{"break", TBREAK},
{"case", TCASE},
{"char", TCHAR},
{"const", TCONST},
{"continue", TCONTINUE},
{"default", TDEFAULT},
{"do", TDO},
{"double", TDOUBLE},
{"else", TELSE},
{"enum", TENUM},
{"extern", TEXTERN},
{"float", TFLOAT},
{"for", TFOR},
{"goto", TGOTO},
{"if", TIF},
{"inline", TINLINE},
{"int", TINT},
{"long", TLONG},
{"register", TREGISTER},
{"restrict", TRESTRICT},
{"return", TRETURN},
{"short", TSHORT},
{"signed", TSIGNED},
{"sizeof", TSIZEOF},
{"static", TSTATIC},
{"struct", TSTRUCT},
{"switch", TSWITCH},
{"typedef", TTYPEDEF},
{"union", TUNION},
{"unsigned", TUNSIGNED},
{"void", TVOID},
{"volatile", TVOLATILE},
{"while", TWHILE},
};
size_t low = 0, high = LEN(keywords), mid;
int cmp;
while (low < high) {
mid = (low + high) / 2;
cmp = strcmp(tok->lit, keywords[mid].name);
if (cmp == 0) {
free(tok->lit);
tok->kind = keywords[mid].value;
tok->lit = NULL;
break;
}
if (cmp < 0)
high = mid;
else
low = mid + 1;
}
}
void
ppinit(const char *file)
{
if (scanfrom(file) < 0)
fatal("open %s:", file);
next();
}
static void
nextinto(struct token *t)
{
do scan(t);
while (t->kind == TNEWLINE);
if (t->kind == TIDENT)
keyword(t);
}
void
next(void)
{
if (pending.kind) {
tok = pending;
pending.kind = TNONE;
} else {
nextinto(&tok);
}
}
bool
peek(int kind)
{
if (!pending.kind)
nextinto(&pending);
if (pending.kind != kind)
return false;
pending.kind = TNONE;
nextinto(&tok);
return true;
}
char *
expect(int kind, const char *msg)
{
char *lit;
if (tok.kind != kind)
error(&tok.loc, "expected %d %s, saw %d", kind, msg, tok.kind);
lit = tok.lit;
next();
return lit;
}
bool
consume(int kind)
{
if (tok.kind != kind)
return false;
next();
return true;
}
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