Q/Q.cpp at master · fbcouch/Q · GitHub

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
//
//  Q.cpp
//
//  Created by Jami Couch on 8/15/15.
//  Copyright (c) 2015 Jami Couch. All rights reserved.
//

#include "Q.h"


PromiseVal *PromiseVal::withPromise(void *promise) {
    this->m_promise = true;
    this->m_data = promise;
    return this;
}

PromiseVal *PromiseVal::withValue(void *value) {
    this->m_promise = false;
    this->m_data = value;
    return this;
}

bool PromiseVal::isPromise() {
    return m_promise;
}

bool PromiseVal::isNull() {
    return !m_data;
}

PromiseVal *PromiseVal::value(void *value) {
    return (new PromiseVal())->withValue(value);
}

PromiseVal *PromiseVal::promise(void *promise) {
    return (new PromiseVal())->withPromise(promise);
}

PromiseVal *PromiseVal::null() {
    return new PromiseVal();
}


void Promise::_resolve(PromiseVal *value) {
    if (value->isPromise()) {
        _resolve_promise(value);
    } else {
        _resolve_value(value);
    }

    if (m_finally) m_finally();
    resolved_value = value;
    resolved = true;
}

void Promise::_resolve_promise(PromiseVal *value) {
    auto promise = value->getData<Promise*>();
    auto _m_successes = &m_successes;
    auto _m_promises = &m_promises;

    promise->then([_m_successes, _m_promises](PromiseVal *data) -> PromiseVal*{
        PromiseVal *propagate_value;
        for (int i = 0; i < _m_successes->size(); i++) {
            propagate_value = _m_successes->at(i)(data);
            _m_promises->at(i)->resolve(propagate_value);
        }
        return PromiseVal::null();
    });
}

void Promise::_resolve_value(PromiseVal *value) {
    PromiseVal *propagate_value;
    for (int i = 0; i < m_successes.size(); i++) {
        propagate_value = m_successes[i](value);
        m_promises[i]->resolve(propagate_value);
    }
}

void Promise::_reject(void *value) {
    if (m_failure)
        m_failure(value);
    else
        for (auto promise : m_promises)
            promise->reject(value);

    if (m_finally) m_finally();
    rejected_value = value;
    rejected = true;
}

Promise *Promise::then(Success &&success, Failure &&failure, Finally &&finally) {
    m_successes.push_back(std::forward<Success>(success));
    m_failure = std::forward<Failure>(failure);
    m_finally = std::forward<Finally>(finally);

    auto new_promise = new Promise();
    m_promises.push_back(new_promise);

    if (resolved) _resolve(resolved_value);
    if (rejected) _reject(rejected_value);

    return new_promise;
}

void Promise::resolve(PromiseVal *value) {
    if (resolved || rejected) return;
    _resolve(value);
}

void Promise::reject(void *value) {
    if (resolved || rejected) return;
    _reject(value);
}

Deferred::Deferred() {
    m_promise = new Promise();
}

Promise *Deferred::promise() {
    return m_promise;
}

void Deferred::resolve(PromiseVal *value) {
    m_promise->resolve(value);
}

void Deferred::reject(void *value) {
    m_promise->reject(value);
}

Deferred *Q::defer() {
    return new Deferred();
}

Promise *Q::when(PromiseVal *value) {
    auto deferred = Q::defer();
    deferred->resolve(value);
    return deferred->promise();
}

Promise *Q::resolve(PromiseVal *value) {
    return when(value);
}

Promise *Q::reject(void *value) {
    auto deferred = Q::defer();
    deferred->reject(value);
    return deferred->promise();
}