mir.algebraic_alias.json

public import mir.string_map : StringMap;

union Json_;

Definition union for JsonAlgebraic.

typeof(null) null_;

bool boolean;

long integer;

double float_;

string string;

This[] array;

Self alias in array.

StringMap!This object;

Self alias in mir.string_map.

alias JsonAlgebraic = mir.algebraic.Algebraic!(Json_).Algebraic;

JSON tagged algebraic alias.

The example below shows only the basic features. Advanced API to work with algebraic types can be found at mir.algebraic. See also mir.string_map - ordered string-value associative array.

Examples:

import mir.test: should;
import mir.ndslice.topology: map;
import mir.array.allocation: array;

JsonAlgebraic value;

StringMap!JsonAlgebraic object;

// Default
assert(value.isNull);
assert(value.kind == JsonAlgebraic.Kind.null_);

// Boolean
value = object["bool"] = true;
assert(!value.isNull);
assert(value == true);
assert(value.kind == JsonAlgebraic.Kind.boolean);
// access
assert(value.boolean == true);
assert(value.get!bool == true);
assert(value.get!"boolean" == true);
assert(value.get!(JsonAlgebraic.Kind.boolean) == true);
// nothrow access
assert(value.trustedGet!bool == true);
assert(value.trustedGet!"boolean" == true);
assert(value.trustedGet!(JsonAlgebraic.Kind.boolean) == true);
// checks
assert(!value._is!string);
assert(value._is!bool);
assert(value._is!"boolean");
assert(value._is!(JsonAlgebraic.Kind.boolean));

// Null
value = object["null"] = null;
assert(value.isNull);
assert(value == null);
assert(value.kind == JsonAlgebraic.Kind.null_);
// access
assert(value.null_ == null);
assert(value.get!(typeof(null)) == null);
assert(value.get!(JsonAlgebraic.Kind.null_) == null);

// String
value = object["string"] = "s";
assert(value.kind == JsonAlgebraic.Kind.string);
assert(value == "s");
// access
// Yep, `string` here is an alias to `get!(immutable(char)[])` method
assert(value.string == "s");
// `string` here is an alias of type `immutable(char)[]`
assert(value.get!string == "s");
assert(value.get!"string" == "s");
// finally, `string` here is an enum meber
assert(value.get!(JsonAlgebraic.Kind.string) == "s");

// Integer
value = object["integer"] = 4;
assert(value.kind == JsonAlgebraic.Kind.integer);
assert(value == 4);
assert(value != 4.0);
assert(value.integer == 4);

// Float
value = object["float"] = 3.0;
assert(value.kind == JsonAlgebraic.Kind.float_);
assert(value != 3);
assert(value == 3.0);
assert(value.float_ == 3.0);

// Array
JsonAlgebraic[] arr = [0, 1, 2, 3, 4].map!JsonAlgebraic.array;

value = object["array"] = arr;
assert(value.kind == JsonAlgebraic.Kind.array);
assert(value == arr);
assert(value.array[3] == 3);

// Object
assert(object.keys == ["bool", "null", "string", "integer", "float", "array"]);
object.values[0] = "false";
assert(object["bool"] == "false"); // it is a string now
object.remove("bool"); // remove the member

value = object["array"] = object;
assert(value.kind == JsonAlgebraic.Kind.object);
assert(value.object.keys is object.keys);

JsonAlgebraic[string] aa = object.toAA;
object = aa.StringMap!JsonAlgebraic;

JsonAlgebraic fromAA = ["a" : JsonAlgebraic(3), "b" : JsonAlgebraic("b")];
assert(fromAA.object["a"] == 3);
assert(fromAA.object["b"] == "b");

// object foreach iteration
long sum;
foreach (ref key, ref val; fromAA.object)
    if (key == "a")
        sum += val.get!long;
sum.should == 3;