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/*
* Copyright © 2022 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 <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "../intdefs.h"
#include "../kv.h"
#include "../noreturn.h"
#include "../os.h"
#include "vec.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 as possible. Default values are
* specified as direct key-value pairs:
*
* <varname> <expr>
*
* Game- or engine-specific values are set using blocks:
*
* <varname> { <gametype> <expr> <gametype> <expr> ... [default <expr>] }
*
* The most complicated it can get is if conditionals are nested, which
* basically translates directly into nested ifs:
* <varname> { <gametype> { <gametype> <expr> <gametype> <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 vec_ent VEC(struct ent *);
struct ent {
const char *name; // (or condition tag, in a child node)
const char *defexpr;
struct vec_ent subents;
struct ent *parent; // to back up a level during parse
};
// root only contains subents list but it's easier to use the same struct
static struct ent root = {0};
struct parsestate {
const os_char *filename;
struct kv_parser *parser;
struct ent *curent; // current ent lol
bool haddefault; // blegh;
};
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:;
if (len == 7 && !memcmp(p, "default", 7)) { // special case!
if (state->curent == &root) {
badparse(state, "unexpected default keyword at top level");
}
struct ent *e = state->curent;
if (e->defexpr) {
badparse(state, "multiple default keywords");
}
state->haddefault = true;
break;
}
state->haddefault = false;
char *k = malloc(len + 1);
if (!k) die("couldn't allocate key string");
// FIXME(?): should check and prevent duplicate keys probably!
// need table.h or something to avoid O(n^2) :)
memcpy(k, p, len); k[len] = '\0';
struct ent *e = malloc(sizeof(*e));
if (!e) die("couldn't allocate memory");
e->name = k;
e->defexpr = 0;
e->subents = (struct vec_ent){0};
if (!vec_push(&state->curent->subents, e)) {
die("couldn't append to array");
}
e->parent = state->curent;
state->curent = e;
break;
case KV_NEST_START:
if (state->haddefault) badparse(state, "default cannot be a block");
break;
case KV_NEST_END:
if (!state->curent->parent) {
badparse(state, "unexpected closing brace");
}
state->curent = state->curent->parent;
break;
case KV_VAL: case KV_VAL_QUOTED:
char *s = malloc(len + 1);
if (!s) die("couldn't allocate value string");
memcpy(s, p, len); s[len] = '\0';
state->curent->defexpr = s;
if (!state->haddefault) {
// a non-default value is just a node that itself only has a
// default value.
state->curent = state->curent->parent;
}
break;
case KV_COND_PREFIX: case KV_COND_SUFFIX:
badparse(state, "unexpected conditional");
}
}
static inline noreturn diewrite(void) { die("couldn't write to file"); }
#define _doindent \
for (int _indent = 0; _indent < indent; ++_indent) { \
if (fputs("\t", out) == -1) diewrite(); \
}
#define _(x) \
if (fprintf(out, "%s\n", x) < 0) diewrite();
#define _i(x) _doindent _(x)
#define F(f, ...) \
if (fprintf(out, f "\n", __VA_ARGS__) < 0) diewrite();
#define Fi(...) _doindent F(__VA_ARGS__)
#define H() \
_( "/* This file is autogenerated by src/build/mkgamedata.c. DO NOT EDIT! */") \
_( "")
static void decls(FILE *out) {
for (struct ent *const *pp = root.subents.data;
pp - root.subents.data < root.subents.sz; ++pp) {
if ((*pp)->defexpr) {
F( "#define has_%s true", (*pp)->name)
if ((*pp)->subents.sz) {
F( "extern int %s;", (*pp)->name)
}
else {
F( "enum { %s = %s };", (*pp)->name, (*pp)->defexpr)
}
}
else {
F( "extern bool has_%s;", (*pp)->name)
F( "extern int %s;", (*pp)->name)
}
}
}
static void inits(FILE *out, const char *var, struct vec_ent *v, bool needhas,
int indent) {
for (struct ent *const *pp = v->data; pp - v->data < v->sz; ++pp) {
Fi("if (GAMETYPE_MATCHES(%s)) {", (*pp)->name)
bool has = needhas && (*pp)->defexpr;
if (has) {
Fi(" has_%s = true;", var);
}
if ((*pp)->defexpr) {
Fi(" %s = %s;", var, (*pp)->defexpr);
}
inits(out, var, &(*pp)->subents, !has, indent + 1);
_i("}")
}
}
static void defs(FILE *out) {
for (struct ent *const *pp = root.subents.data;
pp - root.subents.data < root.subents.sz; ++pp) {
if ((*pp)->defexpr) {
if ((*pp)->subents.sz) {
F( "int %s = %s;", (*pp)->name, (*pp)->defexpr);
}
}
else {
F( "int %s;", (*pp)->name);
F( "bool has_%s = false;", (*pp)->name);
}
}
_( "")
_( "void gamedata_init(void) {")
for (struct ent *const *pp = root.subents.data;
pp - root.subents.data < root.subents.sz; ++pp) {
inits(out, (*pp)->name, &(*pp)->subents, !(*pp)->defexpr, 1);
}
_( "}")
}
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, &root};
char buf[1024];
int nread;
while (nread = read(fd, buf, sizeof(buf))) {
if (nread == -1) die("couldn't read file");
if (!kv_parser_feed(&kv, buf, nread, &kv_cb, &state)) goto ep;
}
if (!kv_parser_done(&kv)) {
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();
decls(out);
out = fopen(".build/include/gamedatainit.gen.h", "wb");
if (!out) die("couldn't open gamedatainit.gen.h");
H();
defs(out);
return 0;
}
// vi: sw=4 ts=4 noet tw=80 cc=80
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