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/*
* Copyright © 2021 Michael Smith <mikesmiffy128@gmail.com>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
* OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "../intdefs.h"
#include "../kv.h"
#include "../noreturn.h"
#include "../os.h"
#ifdef _WIN32
#define fS "S"
#else
#define fS "s"
#endif
static noreturn die(const char *s) {
fprintf(stderr, "mkgamedata: %s\n", s);
exit(100);
}
/*
* We keep the gamedata KV format as simple and flat as possible:
*
* <varname> <expr>
* <varname> { <gametype> <expr> <gametype> <expr> ... [default <expr>] }
* [however many entries...]
*
* If that doesn't make sense, just look at one of the existing data files and
* then it should be obvious. :^)
*
* Note: if `default` isn't given in a conditional block, that piece of gamedata
* is considered unavailable and modules that use it won't get initialised/used.
*/
struct ent {
const char *name;
// normally I'd be inclined to do some pointer bitpacking meme but that's
// annoying and doesn't matter here so here's an bool and 7 bytes of padding
bool iscond;
union {
struct {
struct ent_cond {
const char *name;
// note: can be any old C expression; just plopped in
const char *expr;
struct ent_cond *next;
} *cond;
// store user-specified defaults in a special place to make the
// actual codegen logic easier
const char *defval;
};
const char *expr;
};
struct ent *next;
} *ents_head, **ents_tail = &ents_head;
struct parsestate {
const os_char *filename;
struct kv_parser *parser;
const char *lastkey;
struct ent_cond **nextcond;
bool incond;
};
static noreturn badparse(struct parsestate *state, const char *e) {
fprintf(stderr, "mkgamedata: %" fS ":%d:%d: parse error: %s",
state->filename, state->parser->line, state->parser->col, e);
exit(1);
}
static void kv_cb(enum kv_token type, const char *p, uint len, void *ctxt) {
struct parsestate *state = ctxt;
switch (type) {
case KV_IDENT: case KV_IDENT_QUOTED:;
char *k = malloc(len + 1);
if (!k) die("couldn't allocate key string");
memcpy(k, p, len);
k[len] = '\0';
state->lastkey = k;
break;
case KV_NEST_START:
if (state->incond) badparse(state, "unexpected nested object");
state->incond = true;
struct ent *e = malloc(sizeof(*e));
if (!e) die("couldn't allocate memory");
e->name = state->lastkey;
e->iscond = true;
e->cond = 0;
e->defval = 0;
state->nextcond = &e->cond;
e->next = 0;
*ents_tail = e;
ents_tail = &e->next;
break;
case KV_NEST_END:
state->incond = false;
break;
case KV_VAL: case KV_VAL_QUOTED:
if (state->incond) {
// dumb special case mentioned above
if (!strcmp(state->lastkey, "default")) {
(*ents_tail)->defval = state->lastkey;
break;
}
struct ent_cond *c = malloc(sizeof(*c));
if (!c) die("couldn't allocate memory");
c->name = state->lastkey;
char *expr = malloc(len + 1);
if (!expr) die("couldn't allocate value/expression string");
memcpy(expr, p, len);
expr[len] = '\0';
c->expr = expr;
c->next = 0;
*(state->nextcond) = c;
state->nextcond = &c->next;
}
else {
// also kind of dumb but whatever
struct ent *e = malloc(sizeof(*e));
if (!e) die("couldn't allocate memory");
e->name = state->lastkey;
e->iscond = false;
char *expr = malloc(len + 1);
if (!expr) die("couldn't allocate value/expression string");
memcpy(expr, p, len);
expr[len] = '\0';
e->expr = expr;
e->next = 0;
*ents_tail = e;
ents_tail = &e->next;
}
}
}
#define _(x) \
if (fprintf(out, "%s\n", x) < 0) die("couldn't write to file");
#define F(f, ...) \
if (fprintf(out, f "\n", __VA_ARGS__) < 0) die("couldn't write to file");
#define H() \
_( "/* This file is autogenerated by src/build/mkgamedata.c. DO NOT EDIT! */") \
_( "")
int OS_MAIN(int argc, os_char *argv[]) {
for (++argv; *argv; ++argv) {
int fd = os_open(*argv, O_RDONLY);
if (fd == -1) die("couldn't open file");
struct kv_parser kv = {0};
struct parsestate state = {*argv, &kv};
char buf[1024];
int nread;
while (nread = read(fd, buf, sizeof(buf))) {
if (nread == -1) die("couldn't read file");
kv_parser_feed(&kv, buf, nread, &kv_cb, &state);
if (kv.state == KV_PARSER_ERROR) goto ep;
}
kv_parser_done(&kv);
if (kv.state == KV_PARSER_ERROR) {
ep: fprintf(stderr, "mkgamedata: %" fS ":%d:%d: bad syntax: %s\n",
*argv, kv.line, kv.col, kv.errmsg);
exit(1);
}
close(fd);
}
FILE *out = fopen(".build/include/gamedata.gen.h", "wb");
if (!out) die("couldn't open gamedata.gen.h");
H();
for (struct ent *e = ents_head; e; e = e->next) {
if (e->iscond) {
F( "extern int gamedata_%s;", e->name)
if (e->defval) {
F( "#define gamedata_has_%s true", e->name)
}
else {
F( "extern bool gamedata_has_%s;", e->name)
}
}
else {
F( "enum { gamedata_%s = %s };", e->name, e->expr)
F( "#define gamedata_has_%s true", e->name)
}
}
out = fopen(".build/include/gamedatainit.gen.h", "wb");
if (!out) die("couldn't open gamedatainit.gen.h");
H();
for (struct ent *e = ents_head; e; e = e->next) {
if (e->iscond) {
if (e->defval) {
F( "int gamedata_%s = %s", e->name, e->defval);
}
else {
F( "int gamedata_%s;", e->name);
F( "bool gamedata_has_%s = false;", e->name);
}
}
}
_( "")
_( "void gamedata_init(void) {")
for (struct ent *e = ents_head; e; e = e->next) {
if (e->iscond) {
for (struct ent_cond *c = e->cond; c; c = c->next) {
if (!e->defval) {
// XXX: not bothering to generate `else`s. technically this
// has different semantics; we hope that the compiler can
// just do the right thing either way.
F( " if (GAMETYPE_MATCHES(%s)) {", c->name)
F( " gamedata_%s = %s;", e->name, c->expr)
F( " gamedata_has_%s = true;", e->name)
_( " }")
}
else {
F( " if (GAMETYPE_MATCHES(%s)) %s = %s;", c->name, e->name, c->expr)
}
}
}
}
_( "}")
return 0;
}
// vi: sw=4 ts=4 noet tw=80 cc=80
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