summaryrefslogtreecommitdiffhomepage
path: root/src/build/mkgamedata.c
blob: ca2e1303ae7d7a97eb449b92ffc42755537fe3b1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
/*
 * 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