# Check if a field is a Bool
#
# ~~~
# var validator = new ObjectValidator
# validator.add new BoolField("field", required=false)
# assert validator.validate("""{}""")
# assert validator.validate("""{ "field": true }""")
# assert validator.validate("""{ "field": false }""")
# assert not validator.validate("""{ "field": "foo" }""")
#
# validator = new ObjectValidator
# validator.add new BoolField("field")
# assert not validator.validate("""{}""")
# assert validator.validate("""{ "field": true }""")
# assert validator.validate("""{ "field": false }""")
# assert not validator.validate("""{ "field": "foo" }""")
# ~~~
#
# No type conversion is applied on the input value:
# ~~~
# assert not validator.validate("""{ "field": "true" }""")
# assert not validator.validate("""{ "field": 1 }""")
# assert not validator.validate("""{ "field": [true] }""")
# ~~~
class BoolField
	super RequiredField

	redef fun validate_field(v, obj) do
		if not super then return false
		var val = obj.get_or_null(field)
		if val == null then
			if required == null or required == true then
				v.validation.add_error(field, "Expected Bool got `null`")
				return false
			else
				return true
			end
		end
		if not val isa Bool then
			v.validation.add_error(field, "Expected Bool got `{val.class_name}`")
			return false
		end
		return true
	end
end