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| require "json" | |
| class Test | |
| exclude_names = ["to_json"] | |
| def initialize | |
| @testv = 10 | |
| @testvb = 10 | |
| end | |
| def testf() | |
| puts "testf" | |
| return @testv | |
| end | |
| def vs | |
| return {a: "b", c: "d"} | |
| end | |
| macro jsonifier(exclude_names = [] of String, include_names = [] of String, include_methods = [] of String) | |
| def to_json | |
| String.build do |str| | |
| to_json str | |
| end | |
| end | |
| def to_json(io : IO) | |
| {% begin %} | |
| JSON.build(io) do |json| | |
| json.object do | |
| # all instance vars | |
| to_serialize = \{{ @type.instance_vars.map &.id.stringify }} | |
| # remove any exclusions | |
| to_serialize = to_serialize - {{ exclude_names }} | |
| # remove anything that isn't explicitly included | |
| # unless inclusions is blank, then we include all | |
| include_names = {{ include_names }} | |
| to_serialize.reject! do |n| | |
| !include_names.includes?(n) | |
| end unless include_names.empty? | |
| # generate a json.field entry for every ivar, but only serialize if included | |
| # Works this way because we don't have access to both ivars and the macro vars at the same time | |
| # so we determine serializiation at runtime based on an if | |
| \{% for ivar in @type.instance_vars %} | |
| json.field \{{ ivar.id.stringify }}, @\{{ ivar.id }} if to_serialize.includes?(\{{ivar.id.stringify}}) | |
| \{% end %} | |
| # also add any methods that are included | |
| {% for klass in @type.methods %} | |
| {% if include_methods.includes?(klass.name.stringify) %} | |
| json.field {{ klass.name.stringify }}, {{ klass.name }} | |
| {% end %} | |
| {% end %} | |
| end | |
| end | |
| {% end %} | |
| end | |
| end | |
| jsonifier(exclude_names: ["testv"] of String, include_methods: ["vs"]) | |
| end | |
| t = Test.new | |
| puts t.vs | |
| puts t.to_json |
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