Re: yaml-cpp and YAML 1.2

Sorry, I will be more precise:

YAML:Node should be parsed differently for the same document:
{ a: true, b: 0x55 }

Failsafe Schema => { !!str a: !!str true, !!str b: !!str 0x55 }

JSON Schema => { !!str a: !!bool true, !!str b: !!str 0x55 }

Core Schema => { !!str a: !!bool true, !!str b: !!int 0x55 }

As you can see the tags should be different

Andrey

On Thu, Mar 3, 2016 at 10:35 PM, Jesse Beder <[email protected]> wrote:

> yaml-cpp doesn't even get so far as saying definitively what "a" and "b"
> are. It parses it as: "a" and "b" are nodes with certain values and tags.
> It doesn't assign types to them because that's the job of the application.
>
> What would it even mean to say that "b" is an integer in C++? The only way
> you can get an integer is to write
>
> int b = ...
>
> In other words, node["b"] cannot have type "int" or "string" or anything
> other than YAML::Node.
>
> On Thu, Mar 3, 2016 at 3:16 PM, Andrey Somov <[email protected]>
> wrote:
>
>> YAML:Node should be parsed differently for the same document:
>> { a: true, b: 0x55 }
>>
>> Failsafe Schema => a and b are strings
>>
>> JSON Schema => a is boolean, b is string
>>
>> Core Schema => a is boolean, b is integer
>>
>> SnakeYAML implements (almost) everything except schemas.
>> That is why SnakeYAML says it only supports YAML 1.1
>> If we do not have to respect schemas than many more parsers may become
>> YAML 1.2 compliant.
>> JS-YAML does support schemas in its API.
>>
>> Cheers,
>> Andrey
>>
>> On Thu, Mar 3, 2016 at 9:11 PM, Jesse Beder <[email protected]> wrote:
>>
>>> The examples are here:
>>>
>>> https://github.com/jbeder/yaml-cpp/blob/master/test/specexamples.h
>>> <https://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_jbeder_yaml-2Dcpp_blob_master_test_specexamples.h&d=BQMFaQ&c=8hUWFZcy2Z-Za5rBPlktOQ&r=MTdCGdNVtXPX6PdqbNc8au-7Xx9X-p2GlN1e0U1iH9A&m=k0_S7vjNbEK3lfoTpRLHdSo404fP2giwHsXzgwMhUZo&s=iOczRD8wKG6Fb4kwEx5dU84FNAlhNBbAqX0MN-oMMDI&e=>
>>>
>>> and the tests are here:
>>>
>>>
>>> https://github.com/jbeder/yaml-cpp/blob/master/test/integration/handler_spec_test.cpp
>>> <https://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_jbeder_yaml-2Dcpp_blob_master_test_integration_handler-5Fspec-5Ftest.cpp&d=BQMFaQ&c=8hUWFZcy2Z-Za5rBPlktOQ&r=MTdCGdNVtXPX6PdqbNc8au-7Xx9X-p2GlN1e0U1iH9A&m=k0_S7vjNbEK3lfoTpRLHdSo404fP2giwHsXzgwMhUZo&s=0lmPGSCYU7BQHiYVVDbjLmJyUsC1aWo8ZDvPV74gpsg&e=>
>>>
>>> https://github.com/jbeder/yaml-cpp/blob/master/test/integration/node_spec_test.cpp
>>> <https://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_jbeder_yaml-2Dcpp_blob_master_test_integration_node-5Fspec-5Ftest.cpp&d=BQMFaQ&c=8hUWFZcy2Z-Za5rBPlktOQ&r=MTdCGdNVtXPX6PdqbNc8au-7Xx9X-p2GlN1e0U1iH9A&m=k0_S7vjNbEK3lfoTpRLHdSo404fP2giwHsXzgwMhUZo&s=GrPg-pjZuou6FFwNTNZ98Bi6ffqWgEOtSioD66xs89I&e=>
>>>
>>> As for parsing with schemas: what does it mean to parse with the JSON
>>> schema in C++? If I write
>>>
>>> X parsed = parseWithJsonSchema(...)
>>>
>>> what is the type of X? In yaml-cpp, the result of parsing is always
>>> YAML::Node, which then can be turned into any type you like statically.
>>>
>>> On Thu, Mar 3, 2016 at 9:48 AM, Andrey Somov <[email protected]>
>>> wrote:
>>>
>>>> Dear Jesse,
>>>> I looked in the source but I could not find the tests which take all
>>>> the examples form the specifications (as libyaml, PyYAML and SnakeYAML do).
>>>> Do you try to parse all the examples from the specification ?
>>>>
>>>> Cheers,
>>>> Andrey
>>>>
>>>>
>>>>
>>>>
>>>> On Wed, Mar 2, 2016 at 6:26 PM, Andrey Somov <[email protected]>
>>>> wrote:
>>>>
>>>>>
>>>>>
>>>>> >Happy to answer any questions.
>>>>>
>>>>> >Because C++ is statically typed and has no initial class, I always
>>>>> viewed schema >as an application task. yaml-cpp lets you deserialize to any
>>>>> application-specific >type, but you have to ask statically, so automatic
>>>>> resolution seems less useful.
>>>>>
>>>>> Dear Jesse,
>>>>> I did not quite catch you. Java is also statically typed, but it is
>>>>> unrelated to Recommended Schemas.
>>>>> The YAML 1.2 spec requires that the user may select (as an option) to
>>>>> parse the very same document with different schemas. JS-yaml does have
>>>>> support for that (partially).
>>>>>
>>>>> If I want to apply JSON schema and use yaml-cpp what should I do ?
>>>>>
>>>>>
>>>>> (other questions follow :-)
>>>>> Cheers,
>>>>> Andrey
>>>>>
>>>>>
>>>>>
>>>>>
>>>>
>>>>
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>>>>
>>>
>>
>>
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