summaryrefslogtreecommitdiffstats
path: root/sca-cpp/trunk/kernel/value.hpp
blob: 660ece0c250a51e6e355d858bae5c4235e60cfc0 (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
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
/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

/* $Rev$ $Date$ */

#ifndef tuscany_value_hpp
#define tuscany_value_hpp

/**
 * Generic value type.
 */

#include <stdlib.h>
#include <math.h>
#include <apr_uuid.h>
#include <apr_time.h>

#include "string.hpp"
#include "sstream.hpp"
#include "gc.hpp"
#include "function.hpp"
#include "list.hpp"
#include "monad.hpp"

namespace tuscany
{

#ifdef WANT_MAINTAINER_COUNTERS

/**
 * Debug utilities. Counters used to track instances of values
 */
long int countValues = 0;
long int countEValues = 0;
long int countCValues = 0;
long int countVValues = 0;

inline const bool resetValueCounters() {
    countValues = countEValues = countCValues = countVValues = 0;
    return true;
}

inline const bool checkValueCounters() {
    return countValues == 0;
}

inline const bool printValueCounters() {
    cout << "countValues " << countValues << endl;
    cout << "countEValues " << countEValues << endl;
    cout << "countCValues " << countCValues << endl;
    cout << "countVValues " << countVValues << endl;
    return true;
}

#else

#define resetValueCounters()
#define checkValueCounters() true
#define printValueCounters()

#endif

#ifdef WANT_MAINTAINER_WATCH

/**
 * Debug utilities. Macro used to write the contents of a value to
 * a string, easier to watch in a debugger than the value itself.
 */

#define debug_watchValue() do { \
        this->watch = watchValue(*this); \
    } while (0)

#else

#define debug_watchValue()

#endif

/**
 * Common value constants.
 */
class value;
extern const value nilValue;
extern const list<value> nilListValue;
extern const list<value> nilPairValue;
extern const value emptyStringValue;
extern const value trueValue;
extern const value falseValue;

/**
 * Common value-based lambda types.
 */
typedef lambda<const value(const list<value>&)> lvvlambda;
typedef lambda<const value(const value&)> vvlambda;
typedef lambda<const bool(const value&)> vblambda;
typedef lambda<const value()> vlambda;

/**
 * Generic value type class.
 */

class value {
public:

    enum ValueType {
        Nil, Symbol, String, List, Number, Bool, Lambda, Ptr
    };

    typedef union {
        const void* mix;
        const gc_ptr<list<value> > lst;
        const string str;
        const lvvlambda func;
        const gc_ptr<value> ptr;
        const double num;
        const bool boo;
    } ValueMix;

    inline value() noexcept : type(value::Nil) {
        debug_inc(countValues);
        debug_inc(countEValues);
        debug_watchValue();
    }

    inline value(const value& v) noexcept : type(v.type) {
        debug_inc(countValues);
        debug_inc(countCValues);
        memcpy((void*)&mix, (void*)&v.mix, sizeof(ValueMix));
#ifdef WANT_MAINTAINER_WATCH
        watch = v.watch;
#endif
    }

    inline value(const gc_mutable_ref<value>& r) noexcept : type(((value*)r)->type) {
        debug_inc(countValues);
        debug_inc(countCValues);
        memcpy((void*)&mix, (void*)&(((value*)r)->mix), sizeof(ValueMix));
#ifdef WANT_MAINTAINER_WATCH
        watch = v.watch;
#endif
    }

    inline virtual ~value() noexcept {
        debug_dec(countValues);
    }

    inline value(const lvvlambda& f) noexcept : type(value::Lambda), func(f) {
        debug_inc(countValues);
        debug_inc(countVValues);
        debug_watchValue();
    }

    inline value(const string& s) noexcept : type(value::String), str(s) {
        debug_inc(countValues);
        debug_inc(countVValues);
        debug_watchValue();
    }

    inline value(const char* s) noexcept : type(value::Symbol), str(s) {
        debug_inc(countValues);
        debug_inc(countVValues);
        debug_watchValue();
    }

    inline value(const list<value>& l) noexcept : type(value::List), lst(new (gc_new<list<value> >()) list<value>(l)) {
        debug_inc(countValues);
        debug_inc(countVValues);
        debug_watchValue();
    }

    inline value(const double d) noexcept : type(value::Number), num(d) {
        debug_inc(countValues);
        debug_inc(countVValues);
        debug_watchValue();
    }

    inline value(const int i) noexcept : type(value::Number), num((double)i) {
        debug_inc(countValues);
        debug_inc(countVValues);
        debug_watchValue();
    }

    inline value(const bool b) noexcept : type(value::Bool), boo(b) {
        debug_inc(countValues);
        debug_inc(countVValues);
        debug_watchValue();
    }

    inline value(const gc_ptr<value> p) noexcept : type(value::Ptr), ptr(p) {
        debug_inc(countValues);
        debug_inc(countVValues);
        debug_watchValue();
    }

    inline value(const failable<value>& m) noexcept : type(value::List),
        lst(new (gc_new<list<value> >()) list<value>(hasContent(m)? mklist<value>(content(m)) :
            rcode(m) == 1? mklist<value>(nilValue, reason(m)) : mklist<value>(nilValue, reason(m), rcode(m)))) {
        debug_inc(countValues);
        debug_inc(countVValues);
        debug_watchValue();
    }

    inline value(const maybe<value>& m) noexcept : type(value::List),
        lst(new (gc_new<list<value> >()) list<value>(hasContent(m)? mklist<value>(content(m)) : nilListValue)) {
        debug_inc(countValues);
        debug_inc(countVValues);
        debug_watchValue();
    }

    value& operator=(const value& v) = delete;

    inline const bool operator!=(const value& v) const noexcept {
        return !this->operator==(v);
    }

    inline const bool operator==(const value& v) const noexcept {
        if(this == &v)
            return true;
        switch(type) {
        case value::Nil:
            return v.type == value::Nil;
        case value::List:
            return v.type == value::List && *lst == *v.lst;
        case value::Lambda:
            return v.type == value::Lambda && func == v.func;
        case value::Symbol:
        case value::String:
            return (v.type == value::Symbol || v.type == value::String) && str == v.str;
        case value::Number:
            // Handle double floating point rounding
            return v.type == value::Number && fabs(num - v.num) < 5e-16;
        case value::Bool:
            return v.type == value::Bool && boo == v.boo;
        case value::Ptr:
            return v.type == value::Ptr && ptr == v.ptr;
        default:
            return false;
        }
    }

    inline const bool operator<(const value& v) const noexcept {
        if(this == &v)
            return false;
        switch(type) {
        case value::List:
            return v.type == value::List && *lst < *v.lst;
        case value::Symbol:
        case value::String:
            return (v.type == value::Symbol || v.type == value::String) && str < v.str;
        case value::Bool:
            return v.type == value::Bool && boo < v.boo;
        case value::Number:
            return v.type == value::Number && num < v.num;
        default:
            return false;
        }
    }

    inline const bool operator>(const value& v) const noexcept {
        if(this == &v)
            return false;
        switch(type) {
        case value::List:
            return v.type == value::List && *lst > *v.lst;
        case value::Symbol:
        case value::String:
            return (v.type == value::Symbol || v.type == value::String) && str > v.str;
        case value::Bool:
            return v.type == value::Bool && boo > v.boo;
        case value::Number:
            return v.type == value::Number && num > v.num;
        default:
            return false;
        }
    }

    inline const value operator()(const list<value>& args) const noexcept {
        return func(args);
    }

    inline operator const string() const noexcept {
        switch(type) {
        case value::Symbol:
        case value::String:
            return str;
        case value::Number: {
            ostringstream os;
            os << num;
            return tuscany::str(os);
        }
        case value::Bool:
            return boo? trueString : falseString;
        default:
            return emptyString;
        }
    }

    inline operator const double() const noexcept {
        switch(type) {
        case value::Symbol:
        case value::String:
            return atof(c_str(str));
        case value::Number:
            return (double)num;
        case value::Bool:
            return boo? 1.0 : 0.0;
        default:
            return 0.0;
        }
    }

    inline operator const int() const noexcept {
        switch(type) {
        case value::Symbol:
        case value::String:
            return atoi(c_str(str));
        case value::Number:
            return (int)num;
        case value::Bool:
            return boo? 1 : 0;
        default:
            return 0;
        }
    }

    inline operator const bool() const noexcept {
        switch(type) {
        case value::Symbol:
        case value::String:
            return str == trueString;
        case value::Number:
            return num != 0.0;
        case value::Bool:
            return boo;
        default:
            return false;
        }
    }

    inline operator const gc_ptr<value>() const noexcept {
        return ptr;
    }

    inline operator const list<value>() const noexcept {
        switch(type) {
        case value::List:
            return *lst;
        default:
            return nilListValue;
        }
        return *lst;
    }

    inline operator const lvvlambda() const noexcept {
        return func;
    }

private:
    friend ostream& operator<<(ostream&, const value&) noexcept;
    friend const value::ValueType type(const value& v) noexcept;
    friend const bool setvalue(value& target, const value& v) noexcept;

#ifdef WANT_MAINTAINER_WATCH
    friend const string watchValue(const value& v);
    string watch;
#endif

    const ValueType type;
    union {
        void* mix;
        const gc_ptr<list<value> > lst;
        const string str;
        const lvvlambda func;
        const gc_ptr<value> ptr;
        const double num;
        const bool boo;
    };
};

/**
 * Common value constants.
 */
const value nilValue;
const list<value> nilListValue = list<value>();
const list<value> nilPairValue = mklist<value>(nilValue, nilValue);
const value emptyStringValue(emptyString);
const value trueValue(true);
const value falseValue(false);

#ifdef WANT_MAINTAINER_WATCH

/**
 * Debug utility used to write the contents of a value to a string, easier
 * to watch than the value itself in a debugger.
 */
inline const string watchValue(const value& v) {
    if (v.type == value::List)
        return watchList<value>(v);
    odebugstream os;
    os << v;
    return str(os);
}

#endif

/**
 * Write an escape string to a buffer.
 */
inline const char* escapestr(const char* const s, char* const buf) noexcept {
    if (*s == '\0') {
        *buf = '\0';
        return buf;
    }
    if (*s == '\\' || *s == '"') {
        *buf = '\\';
        *(buf + 1) = *s;
        return escapestr(s + 1, buf + 2);
    }
    *buf = *s;
    return escapestr(s + 1, buf + 1);
}

/**
 * Write an escaped string value to a stream.
 */
inline ostream& escvwrite(const string& str, ostream& out) noexcept {
    char* buf = gc_cnew(length(str) * 2 + 1);
    escapestr(c_str(str), buf);
    out << buf;
    return out;
}

/**
 * Write a value to a stream.
 */
inline ostream& operator<<(ostream& out, const value& v) noexcept {
    switch(v.type) {
    case value::List:
        return out << *v.lst;
    case value::Lambda:
        return out << "lambda::" << v.func;
    case value::Symbol:
        return out << v.str;
    case value::String:
        out << '\"';
        escvwrite(v.str, out);
        return out << '\"';
    case value::Number:
        return out << v.num;
    case value::Bool:
        if(v.boo)
            return out << trueString;
        else
            return out << falseString;
    case value::Ptr: {
        if (v.ptr == gc_ptr<value>(NULL))
            return out << "gc_ptr::null";
        return out << "gc_ptr::" << v.ptr;
    }
    default:
        return out << "nil";
    }
}

/**
 * Returns the type of a value.
 */
inline const value::ValueType type(const value& v) noexcept {
    return v.type;
}

/**
 * Returns true if a value is nil.
 */
inline const bool isNull(const value& v) noexcept {
    return type(v) == value::Nil;
}

/**
 * Returns true if a value is a lambda.
 */
inline const bool isLambda(const value& v) noexcept {
    return type(v) == value::Lambda;
}

/**
 * Returns true if a value is a string.
 */
inline const bool isString(const value& v) noexcept {
    return type(v) == value::String;
}

/**
 * Returns true if a value is a symbol.
 */
inline const bool isSymbol(const value& v) noexcept {
    return type(v) == value::Symbol;
}

/**
 * Returns true if a value is a list.
 */
inline const bool isList(const value& v) noexcept {
    return type(v) == value::List;
}

/**
 * Returns true if a value is a number.
 */
inline const bool isNumber(const value& v) noexcept {
    return type(v) == value::Number;
}

/**
 * Returns true if a value is a boolean.
 */
inline const bool isBool(const value& v) noexcept {
    return type(v) == value::Bool;
}

/**
 * Returns true if a value is a pointer.
 */
inline const bool isPtr(const value& v) noexcept {
    return type(v) == value::Ptr;
}

/**
 * Returns true if a value is a tagged list.
 */
inline const bool isTaggedList(const value& exp, const value& tag) noexcept {
    if(isList(exp) && !isNull((list<value>)exp))
        return car((list<value>)exp) == tag;
    return false;
}

/**
 * Returns true if a value is an assoc.
 */
inline const bool isAssoc(const value& exp) noexcept {
    return isList(exp) && !isNull((list<value>)exp) && isSymbol(car<value>(exp));
}

/**
 * Make a list of values from a list of other things.
 */
template<typename T> inline const list<value> mkvalues(const list<T>& l) noexcept {
    if (isNull(l))
        return nilListValue;
    return cons<value>(car(l), mkvalues(cdr(l)));
}

/**
 * Convert a list of values to a list of other things.
 */
template<typename T> inline const list<T> convertValues(const list<value>& l) noexcept {
    if (isNull(l))
        return list<T>();
    return cons<T>(car(l), convertValues<T>(cdr(l)));
}

/**
 * Convert a list of lists of values to a list of values.
 */
inline const list<value> listOfValues(const list<list<value> >& l) noexcept {
    if (isNull(l))
        return nilListValue;
    return cons<value>(car(l), listOfValues(cdr(l)));
}

/**
 * Convert a list of values to a list of lists of values.
 */
inline const list<list<value> > listOfListOfValues(const list<value>& l) noexcept {
    if (isNull(l))
        return list<list<value> >();
    return cons<list<value> >(type(car(l)) == value::List? list<value>(car(l)) : nilPairValue, listOfListOfValues(cdr(l)));
}

/**
 * Convert a path string value to a list of values.
 */
inline const list<string> pathTokens(const char* const p) noexcept {
    if (p == NULL || p[0] == '\0')
        return list<string>();
    if (p[0] == '/')
        return tokenize("/", p + 1);
    return tokenize("/", p);
}

inline const list<value> pathValues(const value& p) noexcept {
    return mkvalues(pathTokens(c_str(p)));
}

/**
 * Convert a path represented as a list of values to a string value.
 */
inline const value path(const list<value>& p) noexcept {
    if (isNull(p))
        return emptyString;
    return string("/") + (string)car(p) + (string)path(cdr(p));
}

/**
 * Make a uuid value.
 */
inline const value mkuuid() noexcept {
    apr_uuid_t id;
    apr_uuid_get(&id);
    char buf[APR_UUID_FORMATTED_LENGTH];
    apr_uuid_format(buf, &id);
    return value(string(buf, APR_UUID_FORMATTED_LENGTH));
}

/**
 * Make a random alphanumeric value.
 */
inline const int intrand() noexcept {
    const apr_uint64_t now = apr_time_now();
    srand((unsigned int)(((now >> 32) ^ now) & 0xffffffff));
    return rand() & 0x0FFFF;
}       

inline const value mkrand() noexcept {
    char buf[32];
    const char* const an = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
    for (int i =0; i < 32; i++)
        buf[i] = an[intrand() % 62];
    return value(string(buf, 32));
}

/**
 * Set a value. Use with moderation.
 */
inline const bool setvalue(value& target, const value& v) noexcept {
    if (&target == &v)
        return true;
#ifdef WANT_MAINTAINER_WATCH
    memcpy(&target.watch, &v.watch, sizeof(string));
#endif
    memcpy((void*)&target.type, (void*)&v.type, sizeof(value::ValueType));
    memcpy((void*)&target.mix, (void*)&v.mix, sizeof(value::ValueMix));
    return true;
}

}
#endif /* tuscany_value_hpp */