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GeneratorPrototype.js
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94 lines (79 loc) · 3.79 KB
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/*
* Copyright (C) 2015-2016 Yusuke Suzuki <utatane.tea@gmail.com>.
* Copyright (C) 2016 Apple Inc. All rights reserved.
*
* 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.
*/
// 25.3.3.3 GeneratorResume ( generator, value )
// 25.3.3.4 GeneratorResumeAbrupt(generator, abruptCompletion)
@linkTimeConstant
function generatorResume(generator, state, generatorThis, sentValue, value, resumeMode)
{
"use strict";
var done = state === @GeneratorStateCompleted;
if (!done) {
try {
@putGeneratorInternalField(generator, @generatorFieldState, @GeneratorStateExecuting);
value = @getGeneratorInternalField(generator, @generatorFieldNext).@call(generatorThis, generator, state, sentValue, resumeMode, @getGeneratorInternalField(generator, @generatorFieldFrame));
if (@getGeneratorInternalField(generator, @generatorFieldState) === @GeneratorStateExecuting) {
@putGeneratorInternalField(generator, @generatorFieldState, @GeneratorStateCompleted);
done = true;
}
} catch (error) {
@putGeneratorInternalField(generator, @generatorFieldState, @GeneratorStateCompleted);
throw error;
}
}
return { value, done };
}
function next(value)
{
"use strict";
if (!@isGenerator(this))
@throwTypeError("|this| should be a generator");
var state = @getGeneratorInternalField(this, @generatorFieldState);
if (state === @GeneratorStateExecuting)
@throwTypeError("Generator is executing");
return @generatorResume(this, state, @getGeneratorInternalField(this, @generatorFieldThis), value, @undefined, @GeneratorResumeModeNormal);
}
function return(value)
{
"use strict";
if (!@isGenerator(this))
@throwTypeError("|this| should be a generator");
var state = @getGeneratorInternalField(this, @generatorFieldState);
if (state === @GeneratorStateExecuting)
@throwTypeError("Generator is executing");
return @generatorResume(this, state, @getGeneratorInternalField(this, @generatorFieldThis), value, value, @GeneratorResumeModeReturn);
}
function throw(exception)
{
"use strict";
if (!@isGenerator(this))
@throwTypeError("|this| should be a generator");
var state = @getGeneratorInternalField(this, @generatorFieldState);
if (state === @GeneratorStateExecuting)
@throwTypeError("Generator is executing");
if (state === @GeneratorStateCompleted)
throw exception;
return @generatorResume(this, state, @getGeneratorInternalField(this, @generatorFieldThis), exception, @undefined, @GeneratorResumeModeThrow);
}