Lex comments

Right now graphql-core in the lex pass completely omits comments. If you want to consume the content of comments in tooling, you are out of the luck.

Python graphql shoudl mimic graphql-js and do this. Lee Byron did this here https://github.com/graphql/graphql-js/commit/165b9d3a0b913d792501b0ce2829ad417d83122d by making the stream of lex tokens a doubly-linked list so you can "peek" backwards and inspect the contents of comments.

I'll submit a pull request at some point to do this but if someone feels like doing it go nuts!

Start by reading the graphql-core lex pass and comparing its token stream with the linked graphql-js commit. The issue describes exposing comments through a doubly-linked token list so tooling can inspect them; done means comment content is available to consumers without being omitted.

Vom Indexierungsmodell aus dem Issue-Text verfasst.