duktape/testcases/test-builtin-json-enc-replacer.js

/*
 *  Test the replacer (2nd argument) of JSON.stringify().
 */

/*===
identity replacer
replacer: [object Object] string  object [object Object]
replacer: [object Object] string foo number 1
replacer: [object Object] string bar string bar
{"foo":1,"bar":"bar"}
replace top level with foo
"foo"
replace non-empty primitive values
{"foo":"foo","bar":"foo","quux":{"key1":"foo","key2":"foo"},"quuux":["foo","foo","foo"]}
ignored replacers
{"foo":1,"bar":"bar"}
{"foo":1,"bar":"bar"}
{"foo":1,"bar":"bar"}
{"foo":1,"bar":"bar"}
{"foo":1,"bar":"bar"}
{"foo":1,"bar":"bar"}
{"foo":1,"bar":"bar"}
{"foo":1,"bar":"bar"}
array replacer
repl: k=foo, typeof k=string, v=1, typeof v=number
repl: k=bar, typeof k=string, v=arr1,arr2,arr3, typeof v=object
repl: k=0, typeof k=string, v=arr1, typeof v=string
repl: k=1, typeof k=string, v=arr2, typeof v=string
repl: k=2, typeof k=string, v=arr3, typeof v=string
{"foo":1,"bar":["arr1","arr2","arr3"]}
===*/

function replacerTest1() {
    var obj = {
        foo: 1,
        bar: 'bar'
    };

    function repl(k, v) {
        print('replacer:', this, typeof k, k, typeof v, v);
        return v;
    }

    // Replacer will be called first for the specification mandated
    // holder object and an empty string key.
    print(JSON.stringify(obj, repl));
}

function replacerTest2() {
    var obj = {
        foo: 1,
        bar: 'bar'
    };

    function repl(k, v) {
        return 'foo';
    }

    // When the replacer is called for the top-level holder, return
    // 'foo', thus serializing only that string.
    print(JSON.stringify(obj, repl));
}

function replacerTest3() {
    var obj = {
        foo: 1,
        bar: 'bar',
        quux: {
            key1: 'val1', key2: 'val2'
        },
        quuux: [
            'arr1', 'arr2', 'arr3'
        ]
    };

    function repl(k, v) {
        if (k.length > 0 && typeof v !== 'object') {
            return 'foo';
        } else {
            return v;
        }
    }

    // Replace every non-object value with a non-empty key with 'foo'.
    //
    // Note that this also affects the array serialization.
    // Rhino seems to skip replacer for the array.

    print(JSON.stringify(obj, repl));
}

function replacerTest4() {
    var obj = {
        foo: 1,
        bar: 'bar'
    };

    // replacer must be:
    // 1) a callable function
    // 2) an array, in which case it is interpreted as a PropertyList
    //
    // other types must be ignored

    print(JSON.stringify(obj, undefined));
    print(JSON.stringify(obj, null));
    print(JSON.stringify(obj, true));
    print(JSON.stringify(obj, false));
    print(JSON.stringify(obj, 1.23));
    print(JSON.stringify(obj, 'foo'));
    print(JSON.stringify(obj, {}));
    print(JSON.stringify(obj, { foo: 1, length: 2 }));
}

function replacerTest5() {
    var obj = {
        foo: 1,
        bar: [
            'arr1', 'arr2', 'arr3'
        ]
    };

    function repl(k, v) {
        if (k !== '') {
            print('repl: k=' + k + ', typeof k=' + typeof k +
                  ', v=' + v + ', typeof v=' + typeof v);
        }
        return v;
    }

    // Replacer key argument is always a string, even for arrays:
    // E5.1 Section 15.12.3, JA() algorithm, 8.a; key for Str()
    // call is ToString(index).
    print(JSON.stringify(obj, repl));
}

try {
    print('identity replacer');
    replacerTest1();

    print('replace top level with foo');
    replacerTest2();

    print('replace non-empty primitive values');
    replacerTest3();

    print('ignored replacers');
    replacerTest4();

    print('array replacer');
    replacerTest5();
} catch (e) {
    print(e.name);
}