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
|
/*
* Copyright (C) 2015 Canon Inc.
* Copyright (C) 2015 Igalia.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
// @conditional=ENABLE(STREAMS_API)
function initializeReadableStream(underlyingSource, strategy)
{
"use strict";
if (underlyingSource === @undefined)
underlyingSource = { };
if (strategy === @undefined)
strategy = { highWaterMark: 1, size: function() { return 1; } };
if (!@isObject(underlyingSource))
throw new @TypeError("ReadableStream constructor takes an object as first argument");
if (strategy !== @undefined && !@isObject(strategy))
throw new @TypeError("ReadableStream constructor takes an object as second argument, if any");
this.@underlyingSource = underlyingSource;
this.@queue = @newQueue();
this.@state = @streamReadable;
this.@started = false;
this.@closeRequested = false;
this.@pullAgain = false;
this.@pulling = false;
this.@reader = @undefined;
this.@storedError = @undefined;
this.@disturbed = false;
this.@controller = new @ReadableStreamController(this);
this.@strategy = @validateAndNormalizeQueuingStrategy(strategy.size, strategy.highWaterMark);
@promiseInvokeOrNoopNoCatch(underlyingSource, "start", [this.@controller]).@then(() => {
this.@started = true;
@requestReadableStreamPull(this);
}, (error) => {
if (this.@state === @streamReadable)
@errorReadableStream(this, error);
});
return this;
}
function cancel(reason)
{
"use strict";
if (!@isReadableStream(this))
return @Promise.@reject(new @TypeError("Function should be called on a ReadableStream"));
if (@isReadableStreamLocked(this))
return @Promise.@reject(new @TypeError("ReadableStream is locked"));
return @cancelReadableStream(this, reason);
}
function getReader()
{
"use strict";
if (!@isReadableStream(this))
throw new @TypeError("Function should be called on a ReadableStream");
return new @ReadableStreamReader(this);
}
function pipeThrough(streams, options)
{
"use strict";
const writable = streams.writable;
const readable = streams.readable;
this.pipeTo(writable, options);
return readable;
}
function pipeTo(destination, options)
{
"use strict";
// FIXME: rewrite pipeTo so as to require to have 'this' as a ReadableStream and destination be a WritableStream.
// See https://github.com/whatwg/streams/issues/407.
// We should shield the pipeTo implementation at the same time.
const preventClose = @isObject(options) && !!options.preventClose;
const preventAbort = @isObject(options) && !!options.preventAbort;
const preventCancel = @isObject(options) && !!options.preventCancel;
const source = this;
let reader;
let lastRead;
let lastWrite;
let closedPurposefully = false;
let promiseCapability;
function doPipe() {
lastRead = reader.read();
@Promise.prototype.@then.@call(@Promise.all([lastRead, destination.ready]), function([{ value, done }]) {
if (done)
closeDestination();
else if (destination.state === "writable") {
lastWrite = destination.write(value);
doPipe();
}
}, function(e) {
throw e;
});
}
function cancelSource(reason) {
if (!preventCancel) {
reader.cancel(reason);
reader.releaseLock();
promiseCapability.@reject.@call(@undefined, reason);
} else {
@Promise.prototype.@then.@call(lastRead, function() {
reader.releaseLock();
promiseCapability.@reject.@call(@undefined, reason);
});
}
}
function closeDestination() {
reader.releaseLock();
const destinationState = destination.state;
if (!preventClose && (destinationState === "waiting" || destinationState === "writable")) {
closedPurposefully = true;
@Promise.prototype.@then.@call(destination.close(), promiseCapability.@resolve, promiseCapability.@reject);
} else if (lastWrite !== @undefined)
@Promise.prototype.@then.@call(lastWrite, promiseCapability.@resolve, promiseCapability.@reject);
else
promiseCapability.@resolve.@call();
}
function abortDestination(reason) {
reader.releaseLock();
if (!preventAbort)
destination.abort(reason);
promiseCapability.@reject.@call(@undefined, reason);
}
promiseCapability = @newPromiseCapability(@Promise);
reader = source.getReader();
@Promise.prototype.@then.@call(reader.closed, @undefined, abortDestination);
@Promise.prototype.@then.@call(destination.closed,
function() {
if (!closedPurposefully)
cancelSource(new @TypeError('destination is closing or closed and cannot be piped to anymore'));
},
cancelSource
);
doPipe();
return promiseCapability.@promise;
}
function tee()
{
"use strict";
if (!@isReadableStream(this))
throw new @TypeError("Function should be called on a ReadableStream");
return @teeReadableStream(this, false);
}
function locked()
{
"use strict";
if (!@isReadableStream(this))
throw new @TypeError("Function should be called on a ReadableStream");
return @isReadableStreamLocked(this);
}
|
