Javascript
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515行
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// Copyright 2009 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * 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.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "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 THE COPYRIGHT
// OWNER 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.
/**
* @fileoverview Test reduce and reduceRight
*/
function clone(v) {
// Shallow-copies arrays, returns everything else verbatim.
if (v instanceof Array) {
// Shallow-copy an array.
var newArray = new Array(v.length);
for (var i in v) {
newArray[i] = v[i];
}
return newArray;
}
return v;
}
// Creates a callback function for reduce/reduceRight that tests the number
// of arguments and otherwise behaves as "func", but which also
// records all calls in an array on the function (as arrays of arguments
// followed by result).
function makeRecorder(func, testName) {
var record = [];
var f = function recorder(a, b, i, s) {
assertEquals(4, arguments.length,
testName + "(number of arguments: " + arguments.length + ")");
assertEquals("number", typeof(i), testName + "(index must be number)");
assertEquals(s[i], b, testName + "(current argument is at index)");
if (record.length > 0) {
var prevRecord = record[record.length - 1];
var prevResult = prevRecord[prevRecord.length - 1];
assertEquals(prevResult, a,
testName + "(prev result -> current input)");
}
var args = [clone(a), clone(b), i, clone(s)];
var result = func.apply(this, arguments);
args.push(clone(result));
record.push(args);
return result;
};
f.record = record;
return f;
}
function testReduce(type,
testName,
expectedResult,
expectedCalls,
array,
combine,
init) {
var rec = makeRecorder(combine);
var result;
var performsCall;
if (arguments.length > 6) {
result = array[type](rec, init);
} else {
result = array[type](rec);
}
var calls = rec.record;
assertEquals(expectedCalls.length, calls.length,
testName + " (number of calls)");
for (var i = 0; i < expectedCalls.length; i++) {
assertEquals(expectedCalls[i], calls[i],
testName + " (call " + (i + 1) + ")");
}
assertEquals(expectedResult, result, testName + " (result)");
}
function sum(a, b) { return a + b; }
function prod(a, b) { return a * b; }
function dec(a, b, i, arr) { return a + b * Math.pow(10, arr.length - i - 1); }
function accumulate(acc, elem, i) { acc[i] = elem; return acc; }
// ---- Test Reduce[Left]
var simpleArray = [2,4,6]
testReduce("reduce", "SimpleReduceSum", 12,
[[0, 2, 0, simpleArray, 2],
[2, 4, 1, simpleArray, 6],
[6, 6, 2, simpleArray, 12]],
simpleArray, sum, 0);
testReduce("reduce", "SimpleReduceProd", 48,
[[1, 2, 0, simpleArray, 2],
[2, 4, 1, simpleArray, 8],
[8, 6, 2, simpleArray, 48]],
simpleArray, prod, 1);
testReduce("reduce", "SimpleReduceDec", 246,
[[0, 2, 0, simpleArray, 200],
[200, 4, 1, simpleArray, 240],
[240, 6, 2, simpleArray, 246]],
simpleArray, dec, 0);
testReduce("reduce", "SimpleReduceAccumulate", simpleArray,
[[[], 2, 0, simpleArray, [2]],
[[2], 4, 1, simpleArray, [2, 4]],
[[2,4], 6, 2, simpleArray, simpleArray]],
simpleArray, accumulate, []);
testReduce("reduce", "EmptyReduceSum", 0, [], [], sum, 0);
testReduce("reduce", "EmptyReduceProd", 1, [], [], prod, 1);
testReduce("reduce", "EmptyReduceDec", 0, [], [], dec, 0);
testReduce("reduce", "EmptyReduceAccumulate", [], [], [], accumulate, []);
testReduce("reduce", "EmptyReduceSumNoInit", 0, [], [0], sum);
testReduce("reduce", "EmptyReduceProdNoInit", 1, [], [1], prod);
testReduce("reduce", "EmptyReduceDecNoInit", 0, [], [0], dec);
testReduce("reduce", "EmptyReduceAccumulateNoInit", [], [], [[]], accumulate);
var simpleSparseArray = [,,,2,,4,,6,,];
testReduce("reduce", "SimpleSparseReduceSum", 12,
[[0, 2, 3, simpleSparseArray, 2],
[2, 4, 5, simpleSparseArray, 6],
[6, 6, 7, simpleSparseArray, 12]],
simpleSparseArray, sum, 0);
testReduce("reduce", "SimpleSparseReduceProd", 48,
[[1, 2, 3, simpleSparseArray, 2],
[2, 4, 5, simpleSparseArray, 8],
[8, 6, 7, simpleSparseArray, 48]],
simpleSparseArray, prod, 1);
testReduce("reduce", "SimpleSparseReduceDec", 204060,
[[0, 2, 3, simpleSparseArray, 200000],
[200000, 4, 5, simpleSparseArray, 204000],
[204000, 6, 7, simpleSparseArray, 204060]],
simpleSparseArray, dec, 0);
testReduce("reduce", "SimpleSparseReduceAccumulate", [,,,2,,4,,6],
[[[], 2, 3, simpleSparseArray, [,,,2]],
[[,,,2], 4, 5, simpleSparseArray, [,,,2,,4]],
[[,,,2,,4], 6, 7, simpleSparseArray, [,,,2,,4,,6]]],
simpleSparseArray, accumulate, []);
testReduce("reduce", "EmptySparseReduceSumNoInit", 0, [], [,,0,,], sum);
testReduce("reduce", "EmptySparseReduceProdNoInit", 1, [], [,,1,,], prod);
testReduce("reduce", "EmptySparseReduceDecNoInit", 0, [], [,,0,,], dec);
testReduce("reduce", "EmptySparseReduceAccumulateNoInit",
[], [], [,,[],,], accumulate);
var verySparseArray = [];
verySparseArray.length = 10000;
verySparseArray[2000] = 2;
verySparseArray[5000] = 4;
verySparseArray[9000] = 6;
var verySparseSlice2 = verySparseArray.slice(0, 2001);
var verySparseSlice4 = verySparseArray.slice(0, 5001);
var verySparseSlice6 = verySparseArray.slice(0, 9001);
testReduce("reduce", "VerySparseReduceSum", 12,
[[0, 2, 2000, verySparseArray, 2],
[2, 4, 5000, verySparseArray, 6],
[6, 6, 9000, verySparseArray, 12]],
verySparseArray, sum, 0);
testReduce("reduce", "VerySparseReduceProd", 48,
[[1, 2, 2000, verySparseArray, 2],
[2, 4, 5000, verySparseArray, 8],
[8, 6, 9000, verySparseArray, 48]],
verySparseArray, prod, 1);
testReduce("reduce", "VerySparseReduceDec", Infinity,
[[0, 2, 2000, verySparseArray, Infinity],
[Infinity, 4, 5000, verySparseArray, Infinity],
[Infinity, 6, 9000, verySparseArray, Infinity]],
verySparseArray, dec, 0);
testReduce("reduce", "VerySparseReduceAccumulate",
verySparseSlice6,
[[[], 2, 2000, verySparseArray, verySparseSlice2],
[verySparseSlice2, 4, 5000, verySparseArray, verySparseSlice4],
[verySparseSlice4, 6, 9000, verySparseArray, verySparseSlice6]],
verySparseArray, accumulate, []);
testReduce("reduce", "VerySparseReduceSumNoInit", 12,
[[2, 4, 5000, verySparseArray, 6],
[6, 6, 9000, verySparseArray, 12]],
verySparseArray, sum);
testReduce("reduce", "VerySparseReduceProdNoInit", 48,
[[2, 4, 5000, verySparseArray, 8],
[8, 6, 9000, verySparseArray, 48]],
verySparseArray, prod);
testReduce("reduce", "VerySparseReduceDecNoInit", Infinity,
[[2, 4, 5000, verySparseArray, Infinity],
[Infinity, 6, 9000, verySparseArray, Infinity]],
verySparseArray, dec);
testReduce("reduce", "SimpleSparseReduceAccumulateNoInit",
2,
[[2, 4, 5000, verySparseArray, 2],
[2, 6, 9000, verySparseArray, 2]],
verySparseArray, accumulate);
// ---- Test ReduceRight
testReduce("reduceRight", "SimpleReduceRightSum", 12,
[[0, 6, 2, simpleArray, 6],
[6, 4, 1, simpleArray, 10],
[10, 2, 0, simpleArray, 12]],
simpleArray, sum, 0);
testReduce("reduceRight", "SimpleReduceRightProd", 48,
[[1, 6, 2, simpleArray, 6],
[6, 4, 1, simpleArray, 24],
[24, 2, 0, simpleArray, 48]],
simpleArray, prod, 1);
testReduce("reduceRight", "SimpleReduceRightDec", 246,
[[0, 6, 2, simpleArray, 6],
[6, 4, 1, simpleArray, 46],
[46, 2, 0, simpleArray, 246]],
simpleArray, dec, 0);
testReduce("reduceRight", "SimpleReduceRightAccumulate", simpleArray,
[[[], 6, 2, simpleArray, [,,6]],
[[,,6], 4, 1, simpleArray, [,4,6]],
[[,4,6], 2, 0, simpleArray, simpleArray]],
simpleArray, accumulate, []);
testReduce("reduceRight", "EmptyReduceRightSum", 0, [], [], sum, 0);
testReduce("reduceRight", "EmptyReduceRightProd", 1, [], [], prod, 1);
testReduce("reduceRight", "EmptyReduceRightDec", 0, [], [], dec, 0);
testReduce("reduceRight", "EmptyReduceRightAccumulate", [],
[], [], accumulate, []);
testReduce("reduceRight", "EmptyReduceRightSumNoInit", 0, [], [0], sum);
testReduce("reduceRight", "EmptyReduceRightProdNoInit", 1, [], [1], prod);
testReduce("reduceRight", "EmptyReduceRightDecNoInit", 0, [], [0], dec);
testReduce("reduceRight", "EmptyReduceRightAccumulateNoInit",
[], [], [[]], accumulate);
testReduce("reduceRight", "SimpleSparseReduceRightSum", 12,
[[0, 6, 7, simpleSparseArray, 6],
[6, 4, 5, simpleSparseArray, 10],
[10, 2, 3, simpleSparseArray, 12]],
simpleSparseArray, sum, 0);
testReduce("reduceRight", "SimpleSparseReduceRightProd", 48,
[[1, 6, 7, simpleSparseArray, 6],
[6, 4, 5, simpleSparseArray, 24],
[24, 2, 3, simpleSparseArray, 48]],
simpleSparseArray, prod, 1);
testReduce("reduceRight", "SimpleSparseReduceRightDec", 204060,
[[0, 6, 7, simpleSparseArray, 60],
[60, 4, 5, simpleSparseArray, 4060],
[4060, 2, 3, simpleSparseArray, 204060]],
simpleSparseArray, dec, 0);
testReduce("reduceRight", "SimpleSparseReduceRightAccumulate", [,,,2,,4,,6],
[[[], 6, 7, simpleSparseArray, [,,,,,,,6]],
[[,,,,,,,6], 4, 5, simpleSparseArray, [,,,,,4,,6]],
[[,,,,,4,,6], 2, 3, simpleSparseArray, [,,,2,,4,,6]]],
simpleSparseArray, accumulate, []);
testReduce("reduceRight", "EmptySparseReduceRightSumNoInit",
0, [], [,,0,,], sum);
testReduce("reduceRight", "EmptySparseReduceRightProdNoInit",
1, [], [,,1,,], prod);
testReduce("reduceRight", "EmptySparseReduceRightDecNoInit",
0, [], [,,0,,], dec);
testReduce("reduceRight", "EmptySparseReduceRightAccumulateNoInit",
[], [], [,,[],,], accumulate);
var verySparseSuffix6 = [];
verySparseSuffix6[9000] = 6;
var verySparseSuffix4 = [];
verySparseSuffix4[5000] = 4;
verySparseSuffix4[9000] = 6;
var verySparseSuffix2 = verySparseSlice6;
testReduce("reduceRight", "VerySparseReduceRightSum", 12,
[[0, 6, 9000, verySparseArray, 6],
[6, 4, 5000, verySparseArray, 10],
[10, 2, 2000, verySparseArray, 12]],
verySparseArray, sum, 0);
testReduce("reduceRight", "VerySparseReduceRightProd", 48,
[[1, 6, 9000, verySparseArray, 6],
[6, 4, 5000, verySparseArray, 24],
[24, 2, 2000, verySparseArray, 48]],
verySparseArray, prod, 1);
testReduce("reduceRight", "VerySparseReduceRightDec", Infinity,
[[0, 6, 9000, verySparseArray, Infinity],
[Infinity, 4, 5000, verySparseArray, Infinity],
[Infinity, 2, 2000, verySparseArray, Infinity]],
verySparseArray, dec, 0);
testReduce("reduceRight", "VerySparseReduceRightAccumulate",
verySparseSuffix2,
[[[], 6, 9000, verySparseArray, verySparseSuffix6],
[verySparseSuffix6, 4, 5000, verySparseArray, verySparseSuffix4],
[verySparseSuffix4, 2, 2000, verySparseArray, verySparseSuffix2]],
verySparseArray, accumulate, []);
testReduce("reduceRight", "VerySparseReduceRightSumNoInit", 12,
[[6, 4, 5000, verySparseArray, 10],
[10, 2, 2000, verySparseArray, 12]],
verySparseArray, sum);
testReduce("reduceRight", "VerySparseReduceRightProdNoInit", 48,
[[6, 4, 5000, verySparseArray, 24],
[24, 2, 2000, verySparseArray, 48]],
verySparseArray, prod);
testReduce("reduceRight", "VerySparseReduceRightDecNoInit", Infinity,
[[6, 4, 5000, verySparseArray, Infinity],
[Infinity, 2, 2000, verySparseArray, Infinity]],
verySparseArray, dec);
testReduce("reduceRight", "SimpleSparseReduceRightAccumulateNoInit",
6,
[[6, 4, 5000, verySparseArray, 6],
[6, 2, 2000, verySparseArray, 6]],
verySparseArray, accumulate);
// undefined is an element
var undefArray = [,,undefined,,undefined,,];
testReduce("reduce", "SparseUndefinedReduceAdd", NaN,
[[0, undefined, 2, undefArray, NaN],
[NaN, undefined, 4, undefArray, NaN],
],
undefArray, sum, 0);
testReduce("reduceRight", "SparseUndefinedReduceRightAdd", NaN,
[[0, undefined, 4, undefArray, NaN],
[NaN, undefined, 2, undefArray, NaN],
], undefArray, sum, 0);
testReduce("reduce", "SparseUndefinedReduceAddNoInit", NaN,
[[undefined, undefined, 4, undefArray, NaN],
], undefArray, sum);
testReduce("reduceRight", "SparseUndefinedReduceRightAddNoInit", NaN,
[[undefined, undefined, 2, undefArray, NaN],
], undefArray, sum);
// Ignore non-array properties:
var arrayPlus = [1,2,,3];
arrayPlus[-1] = NaN;
arrayPlus[Math.pow(2,32)] = NaN;
arrayPlus[NaN] = NaN;
arrayPlus["00"] = NaN;
arrayPlus["02"] = NaN;
arrayPlus["-0"] = NaN;
testReduce("reduce", "ArrayWithNonElementPropertiesReduce", 6,
[[0, 1, 0, arrayPlus, 1],
[1, 2, 1, arrayPlus, 3],
[3, 3, 3, arrayPlus, 6],
], arrayPlus, sum, 0);
testReduce("reduceRight", "ArrayWithNonElementPropertiesReduceRight", 6,
[[0, 3, 3, arrayPlus, 3],
[3, 2, 1, arrayPlus, 5],
[5, 1, 0, arrayPlus, 6],
], arrayPlus, sum, 0);
// Test error conditions:
try {
[1].reduce("not a function");
assertUnreachable("Reduce callback not a function not throwing");
} catch (e) {
assertTrue(e instanceof TypeError,
"reduce callback not a function not throwing TypeError");
assertEquals("called_non_callable", e.type,
"reduce non function TypeError type");
}
try {
[1].reduceRight("not a function");
assertUnreachable("ReduceRight callback not a function not throwing");
} catch (e) {
assertTrue(e instanceof TypeError,
"reduceRight callback not a function not throwing TypeError");
assertEquals("called_non_callable", e.type,
"reduceRight non function TypeError type");
}
try {
[].reduce(sum);
assertUnreachable("Reduce no initial value not throwing");
} catch (e) {
assertTrue(e instanceof TypeError,
"reduce no initial value not throwing TypeError");
assertEquals("reduce_no_initial", e.type,
"reduce no initial TypeError type");
}
try {
[].reduceRight(sum);
assertUnreachable("ReduceRight no initial value not throwing");
} catch (e) {
assertTrue(e instanceof TypeError,
"reduceRight no initial value not throwing TypeError");
assertEquals("reduce_no_initial", e.type,
"reduceRight no initial TypeError type");
}
try {
[,,,].reduce(sum);
assertUnreachable("Reduce sparse no initial value not throwing");
} catch (e) {
assertTrue(e instanceof TypeError,
"reduce sparse no initial value not throwing TypeError");
assertEquals("reduce_no_initial", e.type,
"reduce no initial TypeError type");
}
try {
[,,,].reduceRight(sum);
assertUnreachable("ReduceRight sparse no initial value not throwing");
} catch (e) {
assertTrue(e instanceof TypeError,
"reduceRight sparse no initial value not throwing TypeError");
assertEquals("reduce_no_initial", e.type,
"reduceRight no initial TypeError type");
}
// Array changing length
function manipulator(a, b, i, s) {
if (s.length % 2) {
s[s.length * 3] = i;
} else {
s.length = s.length >> 1;
}
return a + b;
}
var arr = [1, 2, 3, 4];
testReduce("reduce", "ArrayManipulationShort", 3,
[[0, 1, 0, [1, 2, 3, 4], 1],
[1, 2, 1, [1, 2], 3],
], arr, manipulator, 0);
var arr = [1, 2, 3, 4, 5];
testReduce("reduce", "ArrayManipulationLonger", 10,
[[0, 1, 0, [1, 2, 3, 4, 5], 1],
[1, 2, 1, [1, 2, 3, 4, 5,,,,,,,,,,, 0], 3],
[3, 3, 2, [1, 2, 3, 4, 5,,,,], 6],
[6, 4, 3, [1, 2, 3, 4], 10],
], arr, manipulator, 0);
function extender(a, b, i, s) {
s[s.length] = s.length;
return a + b;
}
var arr = [1, 2, 3, 4];
testReduce("reduce", "ArrayManipulationExtender", 10,
[[0, 1, 0, [1, 2, 3, 4], 1],
[1, 2, 1, [1, 2, 3, 4, 4], 3],
[3, 3, 2, [1, 2, 3, 4, 4, 5], 6],
[6, 4, 3, [1, 2, 3, 4, 4, 5, 6], 10],
], arr, extender, 0);