summaryrefslogtreecommitdiff
path: root/src/map/script-parse.cpp
blob: 6b41225b9d522309feda0c6ecdb0e6901140720e (plain) (blame)
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
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
#include "script-parse-internal.hpp"
//    script-parse.cpp - EAthena script frontend, engine, and library.
//
//    Copyright © ????-2004 Athena Dev Teams
//    Copyright © 2004-2011 The Mana World Development Team
//    Copyright © 2011 Chuck Miller
//    Copyright © 2011-2014 Ben Longbons <b.r.longbons@gmail.com>
//    Copyright © 2013 wushin
//
//    This file is part of The Mana World (Athena server)
//
//    This program is free software: you can redistribute it and/or modify
//    it under the terms of the GNU General Public License as published by
//    the Free Software Foundation, either version 3 of the License, or
//    (at your option) any later version.
//
//    This program is distributed in the hope that it will be useful,
//    but WITHOUT ANY WARRANTY; without even the implied warranty of
//    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//    GNU General Public License for more details.
//
//    You should have received a copy of the GNU General Public License
//    along with this program.  If not, see <http://www.gnu.org/licenses/>.

#include <set>

#include "../generic/array.hpp"
#include "../generic/db.hpp"
#include "../generic/intern-pool.hpp"

#include "../strings/rstring.hpp"

#include "../io/cxxstdio.hpp"

#include "../mmo/cxxstdio_enums.hpp"

#include "../ast/script.hpp"

#include "map.t.hpp"
#include "script-buffer.hpp"
#include "script-call.hpp"
#include "script-fun.hpp"

#include "../poison.hpp"


namespace tmwa
{
constexpr bool DEBUG_DISP = false;

class ScriptBuffer
{
    typedef ZString::iterator ZSit;

    std::vector<ByteCode> script_buf;
    RString debug_name;
    std::vector<std::pair<ScriptLabel, size_t>> debug_labels;
public:
    ScriptBuffer(RString name) : debug_name(std::move(name)) {}

    // construction methods
    void add_scriptc(ByteCode a);
    void add_scriptb(uint8_t a);
    void add_scripti(uint32_t a);
    void add_scriptl(Borrowed<str_data_t> a);
    void set_label(Borrowed<str_data_t> ld, int pos_);
    ZSit parse_simpleexpr(ZSit p);
    ZSit parse_subexpr(ZSit p, int limit);
    ZSit parse_expr(ZSit p);
    ZSit parse_line(ZSit p, bool *canstep);
    void parse_script(ZString src, int line, bool implicit_end);

    // consumption methods
    ByteCode operator[](size_t i) const { return script_buf[i]; }
    ZString get_str(size_t i) const
    {
        return ZString(strings::really_construct_from_a_pointer, reinterpret_cast<const char *>(&script_buf[i]), nullptr);
    }
};
} // namespace tmwa

void std::default_delete<const tmwa::ScriptBuffer>::operator()(const tmwa::ScriptBuffer *sd)
{
    really_delete1 sd;
}

namespace tmwa
{
// implemented for script-call.hpp because reasons
ByteCode ScriptPointer::peek() const { return (*TRY_UNWRAP(code, abort()))[pos]; }
ByteCode ScriptPointer::pop() { return (*TRY_UNWRAP(code, abort()))[pos++]; }
ZString ScriptPointer::pops()
{
    ZString rv = TRY_UNWRAP(code, abort())->get_str(pos);
    pos += rv.size();
    ++pos;
    return rv;
}

Map<RString, str_data_t> str_datam;
static
str_data_t LABEL_NEXTLINE_;

Map<ScriptLabel, int> scriptlabel_db;
static
std::set<ScriptLabel> probable_labels;
UPMap<RString, const ScriptBuffer> userfunc_db;

static
struct ScriptConfigParse
{
    static const
    int warn_func_no_comma = 1;
    static const
    int warn_cmd_no_comma = 1;
    static const
    int warn_func_mismatch_paramnum = 1;
    static const
    int warn_cmd_mismatch_paramnum = 1;
} script_config;

static
int parse_cmd_if = 0;
static
Option<Borrowed<str_data_t>> parse_cmdp = None;

InternPool variable_names;

Option<Borrowed<str_data_t>> search_strp(XString p)
{
    return str_datam.search(p);
}

Borrowed<str_data_t> add_strp(XString p)
{
    Option<P<str_data_t>> rv_ = search_strp(p);
    OMATCH_BEGIN_SOME (rv, rv_)
    {
        return rv;
    }
    OMATCH_END ();

    RString p2 = p;
    P<str_data_t> datum = str_datam.init(p2);
    datum->type = StringCode::NOP;
    datum->strs = p2;
    datum->backpatch = -1;
    datum->label_ = -1;
    return datum;
}

/*==========================================
 * スクリプトバッファに1バイト書き込む
 *------------------------------------------
 */
void ScriptBuffer::add_scriptc(ByteCode a)
{
    script_buf.push_back(a);
}

/*==========================================
 * スクリプトバッファにデータタイプを書き込む
 *------------------------------------------
 */
void ScriptBuffer::add_scriptb(uint8_t a)
{
    add_scriptc(static_cast<ByteCode>(a));
}

/*==========================================
 * スクリプトバッファに整数を書き込む
 *------------------------------------------
 */
void ScriptBuffer::add_scripti(uint32_t a)
{
    while (a >= 0x40)
    {
        add_scriptb(a | 0xc0);
        a = (a - 0x40) >> 6;
    }
    add_scriptb(a | 0x80);
}

/*==========================================
 * スクリプトバッファにラベル/変数/関数を書き込む
 *------------------------------------------
 */
// 最大16Mまで
void ScriptBuffer::add_scriptl(P<str_data_t> ld)
{
    int backpatch = ld->backpatch;

    switch (ld->type)
    {
        case StringCode::POS:
            add_scriptc(ByteCode::POS);
            add_scriptb(static_cast<uint8_t>(ld->label_));
            add_scriptb(static_cast<uint8_t>(ld->label_ >> 8));
            add_scriptb(static_cast<uint8_t>(ld->label_ >> 16));
            break;
        case StringCode::NOP:
            // need to set backpatch, because it might become a label later
            add_scriptc(ByteCode::VARIABLE);
            ld->backpatch = script_buf.size();
            add_scriptb(static_cast<uint8_t>(backpatch));
            add_scriptb(static_cast<uint8_t>(backpatch >> 8));
            add_scriptb(static_cast<uint8_t>(backpatch >> 16));
            break;
        case StringCode::INT:
            add_scripti(ld->val);
            break;
        case StringCode::FUNC:
            add_scriptc(ByteCode::FUNC_REF);
            add_scriptb(static_cast<uint8_t>(ld->val));
            add_scriptb(static_cast<uint8_t>(ld->val >> 8));
            add_scriptb(static_cast<uint8_t>(ld->val >> 16));
            break;
        case StringCode::PARAM:
            add_scriptc(ByteCode::PARAM);
            add_scriptb(static_cast<uint8_t>(ld->val));
            add_scriptb(static_cast<uint8_t>(ld->val >> 8));
            add_scriptb(static_cast<uint8_t>(ld->val >> 16));
            break;
        default:
            abort();
    }
}

/*==========================================
 * ラベルを解決する
 *------------------------------------------
 */
void ScriptBuffer::set_label(Borrowed<str_data_t> ld, int pos_)
{
    int next;

    ld->type = StringCode::POS;
    ld->label_ = pos_;
    for (int i = ld->backpatch; i >= 0 && i != 0x00ffffff; i = next)
    {
        next = 0;
        // woot! no longer endian-dependent!
        next |= static_cast<uint8_t>(script_buf[i + 0]) << 0;
        next |= static_cast<uint8_t>(script_buf[i + 1]) << 8;
        next |= static_cast<uint8_t>(script_buf[i + 2]) << 16;
        script_buf[i - 1] = ByteCode::POS;
        script_buf[i] = static_cast<ByteCode>(pos_);
        script_buf[i + 1] = static_cast<ByteCode>(pos_ >> 8);
        script_buf[i + 2] = static_cast<ByteCode>(pos_ >> 16);
    }
}

/*==========================================
 * スペース/コメント読み飛ばし
 *------------------------------------------
 */
static
ZString::iterator skip_space(ZString::iterator p)
{
    while (1)
    {
        while (isspace(*p))
            p++;
        if (p[0] == '/' && p[1] == '/')
        {
            while (*p && *p != '\n')
                p++;
        }
        else if (p[0] == '/' && p[1] == '*')
        {
            p++;
            while (*p && (p[-1] != '*' || p[0] != '/'))
                p++;
            if (*p)
                p++;
        }
        else
            break;
    }
    return p;
}

/*==========================================
 * 1単語スキップ
 *------------------------------------------
 */
static
ZString::iterator skip_word(ZString::iterator p)
{
    // prefix
    if (*p == '$')
        p++;                    // MAP鯖内共有変数用
    if (*p == '@')
        p++;                    // 一時的変数用(like weiss)
    if (*p == '#')
        p++;                    // account変数用
    if (*p == '#')
        p++;                    // ワールドaccount変数用

    while (isalnum(*p) || *p == '_')
        p++;

    // postfix
    if (*p == '$')
        p++;                    // 文字列変数

    return p;
}

// TODO: replace this whole mess with some sort of input stream that works
// a line at a time.
static
ZString startptr;
static
int startline;

int script_errors = 0;
/*==========================================
 * エラーメッセージ出力
 *------------------------------------------
 */
static
void disp_error_message(ZString mes, ZString::iterator pos_)
{
    script_errors++;

    assert (startptr.begin() <= pos_ && pos_ <= startptr.end());

    int line;
    ZString::iterator p;

    for (line = startline, p = startptr.begin(); p != startptr.end(); line++)
    {
        ZString::iterator linestart = p;
        ZString::iterator lineend = std::find(p, startptr.end(), '\n');
        if (pos_ < lineend)
        {
            PRINTF("\n%s\nline %d : "_fmt, mes, line);
            for (int i = 0; linestart + i != lineend; i++)
            {
                if (linestart + i != pos_)
                    PRINTF("%c"_fmt, linestart[i]);
                else
                    PRINTF("\'%c\'"_fmt, linestart[i]);
            }
            PRINTF("\a\n"_fmt);
            return;
        }
        p = lineend + 1;
    }
}

/*==========================================
 * 項の解析
 *------------------------------------------
 */
ZString::iterator ScriptBuffer::parse_simpleexpr(ZString::iterator p)
{
    p = skip_space(p);

    if (*p == ';' || *p == ',')
    {
        disp_error_message("unexpected expr end"_s, p);
        exit(1);
    }
    if (*p == '(')
    {

        p = parse_subexpr(p + 1, -1);
        p = skip_space(p);
        if ((*p++) != ')')
        {
            disp_error_message("unmatch ')'"_s, p);
            exit(1);
        }
    }
    else if (isdigit(*p) || ((*p == '-' || *p == '+') && isdigit(p[1])))
    {
        char *np;
        int i = strtoul(&*p, &np, 0);
        add_scripti(i);
        p += np - &*p;
    }
    else if (*p == '"')
    {
        add_scriptc(ByteCode::STR);
        p++;
        while (*p && *p != '"')
        {
            if (*p == '\\')
                p++;
            else if (*p == '\n')
            {
                disp_error_message("unexpected newline @ string"_s, p);
                exit(1);
            }
            add_scriptb(*p++);
        }
        if (!*p)
        {
            disp_error_message("unexpected eof @ string"_s, p);
            exit(1);
        }
        add_scriptb(0);
        p++;                    //'"'
    }
    else
    {
        // label , register , function etc
        ZString::iterator p2 = skip_word(p);
        if (p2 == p)
        {
            disp_error_message("unexpected character"_s, p);
            exit(1);
        }
        XString word(&*p, &*p2, nullptr);
        if (word.startswith("On"_s) || word.startswith("L_"_s) || word.startswith("S_"_s))
            probable_labels.insert(stringish<ScriptLabel>(word));
        if (parse_cmd_if && (word == "callsub"_s || word == "callfunc"_s || word == "return"_s))
        {
            disp_error_message("Sorry, callsub/callfunc/return have never worked properly in an if statement."_s, p);
        }
        P<str_data_t> ld = add_strp(word);

        parse_cmdp = Some(ld);          // warn_*_mismatch_paramnumのために必要
        // why not just check l->str == "if"_s or std::string(p, p2) == "if"_s?
        if (Some(ld) == search_strp("if"_s)) // warn_cmd_no_commaのために必要
            parse_cmd_if++;
        p = p2;

        if (ld->type != StringCode::FUNC && *p == '[')
        {
            // array(name[i] => getelementofarray(name,i) )
            add_scriptl(TRY_UNWRAP(search_strp("getelementofarray"_s), abort()));
            add_scriptc(ByteCode::ARG);
            add_scriptl(ld);
            p = parse_subexpr(p + 1, -1);
            p = skip_space(p);
            if (*p != ']')
            {
                disp_error_message("unmatch ']'"_s, p);
                exit(1);
            }
            p++;
            add_scriptc(ByteCode::FUNC);
        }
        else
            add_scriptl(ld);

    }

    return p;
}

/*==========================================
 * 式の解析
 *------------------------------------------
 */
ZString::iterator ScriptBuffer::parse_subexpr(ZString::iterator p, int limit)
{
    ByteCode op;
    int opl, len;

    p = skip_space(p);

    if (*p == '-')
    {
        ZString::iterator tmpp = skip_space(p + 1);
        if (*tmpp == ';' || *tmpp == ',')
        {
            --script_errors; disp_error_message("deprecated: implicit 'next statement' label"_s, p);
            add_scriptl(borrow(LABEL_NEXTLINE_));
            p++;
            return p;
        }
    }
    ZString::iterator tmpp = p;
    if ((op = ByteCode::NEG, *p == '-') || (op = ByteCode::LNOT, *p == '!')
        || (op = ByteCode::NOT, *p == '~'))
    {
        p = parse_subexpr(p + 1, 100);
        add_scriptc(op);
    }
    else
        p = parse_simpleexpr(p);
    p = skip_space(p);
    while (((op = ByteCode::ADD, opl = 6, len = 1, *p == '+') ||
            (op = ByteCode::SUB, opl = 6, len = 1, *p == '-') ||
            (op = ByteCode::MUL, opl = 7, len = 1, *p == '*') ||
            (op = ByteCode::DIV, opl = 7, len = 1, *p == '/') ||
            (op = ByteCode::MOD, opl = 7, len = 1, *p == '%') ||
            (op = ByteCode::FUNC, opl = 8, len = 1, *p == '(') ||
            (op = ByteCode::LAND, opl = 1, len = 2, *p == '&' && p[1] == '&') ||
            (op = ByteCode::AND, opl = 5, len = 1, *p == '&') ||
            (op = ByteCode::LOR, opl = 0, len = 2, *p == '|' && p[1] == '|') ||
            (op = ByteCode::OR, opl = 4, len = 1, *p == '|') ||
            (op = ByteCode::XOR, opl = 3, len = 1, *p == '^') ||
            (op = ByteCode::EQ, opl = 2, len = 2, *p == '=' && p[1] == '=') ||
            (op = ByteCode::NE, opl = 2, len = 2, *p == '!' && p[1] == '=') ||
            (op = ByteCode::R_SHIFT, opl = 5, len = 2, *p == '>' && p[1] == '>') ||
            (op = ByteCode::GE, opl = 2, len = 2, *p == '>' && p[1] == '=') ||
            (op = ByteCode::GT, opl = 2, len = 1, *p == '>') ||
            (op = ByteCode::L_SHIFT, opl = 5, len = 2, *p == '<' && p[1] == '<') ||
            (op = ByteCode::LE, opl = 2, len = 2, *p == '<' && p[1] == '=') ||
            (op = ByteCode::LT, opl = 2, len = 1, *p == '<')) && opl > limit)
    {
        p += len;
        if (op == ByteCode::FUNC)
        {
            int i = 0;
            P<str_data_t> funcp = TRY_UNWRAP(parse_cmdp, abort());
            Array<ZString::iterator, 128> plist;

            if (funcp->type != StringCode::FUNC)
            {
                disp_error_message("expect function"_s, tmpp);
                exit(0);
            }

            add_scriptc(ByteCode::ARG);
            while (*p && *p != ')' && i < 128)
            {
                plist[i] = p;
                p = parse_subexpr(p, -1);
                p = skip_space(p);
                if (*p == ',')
                    p++;
                else if (*p != ')' && script_config.warn_func_no_comma)
                {
                    disp_error_message("expect ',' or ')' at func params"_s,
                                        p);
                }
                p = skip_space(p);
                i++;
            }
            if (i == 128)
            {
                disp_error_message("PANIC: unrecoverable error in function argument list"_s, p);
                abort();
            }
            plist[i] = p;
            if (*p != ')')
            {
                disp_error_message("func request '(' ')'"_s, p);
                exit(1);
            }
            p++;

            if (funcp->type == StringCode::FUNC
                && script_config.warn_func_mismatch_paramnum)
            {
                ZString arg = builtin_functions[funcp->val].arg;
                int j = 0;
                // TODO handle ? and multiple * correctly
                for (j = 0; arg[j]; j++)
                    if (arg[j] == '*' || arg[j] == '?')
                        break;
                if ((arg[j] == 0 && i != j) || ((arg[j] == '*' || arg[j] == '?') && i < j))
                {
                    disp_error_message("illegal number of parameters"_s,
                            plist[std::min(i, j)]);
                }
                if (!builtin_functions[funcp->val].ret)
                {
                    disp_error_message("statement in function context"_s, tmpp);
                }
            }
        }
        else // not op == ByteCode::FUNC
        {
            p = parse_subexpr(p, opl);
        }
        add_scriptc(op);
        p = skip_space(p);
    }
    return p;                   /* return first untreated operator */
}

/*==========================================
 * 式の評価
 *------------------------------------------
 */
ZString::iterator ScriptBuffer::parse_expr(ZString::iterator p)
{
    switch (*p)
    {
        case ')':
        case ';':
        case ':':
        case '[':
        case ']':
        case '}':
            disp_error_message("unexpected char"_s, p);
            exit(1);
    }
    p = parse_subexpr(p, -1);
    return p;
}

/*==========================================
 * 行の解析
 *------------------------------------------
 */
ZString::iterator ScriptBuffer::parse_line(ZString::iterator p, bool *can_step)
{
    int i = 0;
    Array<ZString::iterator, 128> plist;

    p = skip_space(p);
    if (*p == ';')
    {
        disp_error_message("Double semi-colon"_s, p);
        ++p;
        return p;
    }

    parse_cmd_if = 0;           // warn_cmd_no_commaのために必要

    // 最初は関数名
    ZString::iterator p2 = p;
    p = parse_simpleexpr(p);
    p = skip_space(p);

    P<str_data_t> cmd = TRY_UNWRAP(parse_cmdp, abort());
    if (cmd->type != StringCode::FUNC)
    {
        disp_error_message("expect command"_s, p2);
    }

    {
        // TODO should be LString, but no heterogenous lookup yet
        static
        std::set<ZString> terminators =
        {
            "goto"_s,
            "return"_s,
            "close"_s,
            "menu"_s,
            "end"_s,
            "mapexit"_s,
            "shop"_s,
        };
        *can_step = terminators.count(cmd->strs) == 0;
    }

    add_scriptc(ByteCode::ARG);
    while (*p && *p != ';' && i < 128)
    {
        plist[i] = p;

        p = parse_expr(p);
        p = skip_space(p);
        // 引数区切りの,処理
        if (*p == ',')
            p++;
        else if (*p != ';' && script_config.warn_cmd_no_comma
                 && parse_cmd_if * 2 <= i)
        {
            disp_error_message("expect ',' or ';' at cmd params"_s, p);
        }
        p = skip_space(p);
        i++;
    }
    if (i == 128)
    {
        disp_error_message("PANIC: unknown error in command argument list"_s, p);
        abort();
    }
    plist[i] = p;
    if (*(p++) != ';')
    {
        disp_error_message("need ';'"_s, p);
        exit(1);
    }
    add_scriptc(ByteCode::FUNC);

    if (cmd->type == StringCode::FUNC
        && script_config.warn_cmd_mismatch_paramnum)
    {
        ZString arg = builtin_functions[cmd->val].arg;
        int j = 0;
        // TODO see above
        for (j = 0; arg[j]; j++)
            if (arg[j] == '*' || arg[j] == '?')
                break;
        if ((arg[j] == 0 && i != j) || ((arg[j] == '*' || arg[j] == '?') && i < j))
        {
            disp_error_message("illegal number of parameters"_s,
                    plist[std::min(i, j)]);
        }
        if (builtin_functions[cmd->val].ret)
        {
            disp_error_message("function in statement context"_s, p2);
        }
    }

    return p;
}

/*==========================================
 * 組み込み関数の追加
 *------------------------------------------
 */
static
void add_builtin_functions(void)
{
    for (int i = 0; builtin_functions[i].func; i++)
    {
        P<str_data_t> n = add_strp(builtin_functions[i].name);
        n->type = StringCode::FUNC;
        n->val = i;
    }
}

std::unique_ptr<const ScriptBuffer> compile_script(RString debug_name, const ast::script::ScriptBody& body, bool implicit_end)
{
    auto script_buf = make_unique<ScriptBuffer>(std::move(debug_name));
    script_buf->parse_script(body.braced_body, body.span.begin.line, implicit_end);
    return std::move(script_buf);
}

/*==========================================
 * スクリプトの解析
 *------------------------------------------
 */
void ScriptBuffer::parse_script(ZString src, int line, bool implicit_end)
{
    static int first = 1;

    if (first)
    {
        add_builtin_functions();
    }
    first = 0;
    LABEL_NEXTLINE_.type = StringCode::NOP;
    LABEL_NEXTLINE_.backpatch = -1;
    LABEL_NEXTLINE_.label_ = -1;
    for (auto& pair : str_datam)
    {
        str_data_t& dit = pair.second;
        if (dit.type == StringCode::POS || dit.type == StringCode::VARIABLE)
        {
            dit.type = StringCode::NOP;
            dit.backpatch = -1;
            dit.label_ = -1;
        }
    }

    // 外部用label dbの初期化
    scriptlabel_db.clear();

    // for error message
    startptr = src;
    startline = line;

    bool can_step = true;

    ZString::iterator p = src.begin();
    p = skip_space(p);
    if (*p != '{')
    {
        disp_error_message("not found '{'"_s, p);
        abort();
    }
    for (p++; *p && *p != '}';)
    {
        p = skip_space(p);
        if (*skip_space(skip_word(p)) == ':')
        {
            if (can_step)
            {
                --script_errors; disp_error_message("deprecated: implicit fallthrough"_s, p);
            }
            can_step = true;

            ZString::iterator tmpp = skip_word(p);
            XString str(&*p, &*tmpp, nullptr);
            P<str_data_t> ld = add_strp(str);
            bool e1 = ld->type != StringCode::NOP;
            bool e2 = ld->type == StringCode::POS;
            bool e3 = ld->label_ != -1;
            assert (e1 == e2 && e2 == e3);
            if (e3)
            {
                disp_error_message("dup label "_s, p);
                exit(1);
            }
            set_label(ld, script_buf.size());
            scriptlabel_db.insert(stringish<ScriptLabel>(str), script_buf.size());
            debug_labels.push_back(std::make_pair(stringish<ScriptLabel>(str), script_buf.size()));
            p = tmpp + 1;
            continue;
        }

        if (!can_step)
        {
            --script_errors; disp_error_message("deprecated: unreachable statement"_s, p);
        }
        // 他は全部一緒くた
        p = parse_line(p, &can_step);
        p = skip_space(p);
        add_scriptc(ByteCode::EOL);

        set_label(borrow(LABEL_NEXTLINE_), script_buf.size());
        LABEL_NEXTLINE_.type = StringCode::NOP;
        LABEL_NEXTLINE_.backpatch = -1;
        LABEL_NEXTLINE_.label_ = -1;
    }

    if (can_step && !implicit_end)
    {
        --script_errors; disp_error_message("deprecated: implicit end"_s, p);
    }
    add_scriptc(ByteCode::NOP);

    // resolve the unknown labels
    for (auto& pair : str_datam)
    {
        str_data_t& sit = pair.second;
        if (sit.type == StringCode::NOP)
        {
            sit.type = StringCode::VARIABLE;
            sit.label_ = 0; // anything but -1. Shouldn't matter, but helps asserts.
            size_t pool_index = variable_names.intern(sit.strs);
            for (int next, j = sit.backpatch; j >= 0 && j != 0x00ffffff; j = next)
            {
                next = 0;
                next |= static_cast<uint8_t>(script_buf[j + 0]) << 0;
                next |= static_cast<uint8_t>(script_buf[j + 1]) << 8;
                next |= static_cast<uint8_t>(script_buf[j + 2]) << 16;
                script_buf[j] = static_cast<ByteCode>(pool_index);
                script_buf[j + 1] = static_cast<ByteCode>(pool_index >> 8);
                script_buf[j + 2] = static_cast<ByteCode>(pool_index >> 16);
            }
        }
    }

    for (const auto& pair : scriptlabel_db)
    {
        ScriptLabel key = pair.first;
        if (key.startswith("On"_s))
            continue;
        if (!(key.startswith("L_"_s) || key.startswith("S_"_s)))
            PRINTF("Warning: ugly label: %s\n"_fmt, key);
        else if (!probable_labels.count(key))
            PRINTF("Warning: unused label: %s\n"_fmt, key);
    }
    for (ScriptLabel used : probable_labels)
    {
        if (scriptlabel_db.search(used).is_none())
            PRINTF("Warning: no such label: %s\n"_fmt, used);
    }
    probable_labels.clear();

    if (!DEBUG_DISP)
        return;
    for (size_t i = 0; i < script_buf.size(); i++)
    {
        if ((i & 15) == 0)
            PRINTF("%04zx : "_fmt, i);
        PRINTF("%02x "_fmt, script_buf[i]);
        if ((i & 15) == 15)
            PRINTF("\n"_fmt);
    }
    PRINTF("\n"_fmt);
}
} // namespace tmwa