`OverlappingFieldsCanBeMerged` would infinite loop when passed something like
```graphql
fragment A on User {
name
...A
}
```
It's not `OverlappingFieldsCanBeMerged`'s responsibility to detect that validation error, but we still would ideally avoid infinite looping.
This detects that case, and pretends that the infinite spread wasn't there for the purposes of this validation step.
Also, by memoizing and checking for self-references this removes duplicate reports.
ref: graphql/graphql-js#1111
This improves the overlapping fields validation performance and improves error reporting quality by separating the concepts of checking fields "within" a single collection of fields from checking fields "between" two different collections of fields. This ensures for deeply overlapping fields that nested fields are not checked against each other repeatedly. Extending this concept further, fragment spreads are no longer expanded inline before looking for conflicts, instead the fields within a fragment are compared to the fields with the selection set which contained the referencing fragment spread.
e.g.
```graphql
{
same: a
same: b
...X
}
fragment X on T {
same: c
same: d
}
```
In the above example, the initial query body is checked "within" so `a` is compared to `b`. Also, the fragment `X` is checked "within" so `c` is compared to `d`. Because of the fragment spread, the query body and fragment `X` are checked "between" so that `a` and `b` are each compared to `c` and `d`. In this trivial example, no fewer checks are performed, but in the case where fragments are referenced multiple times, this reduces the overall number of checks (regardless of memoization).
**BREAKING**: This can change the order of fields reported when a conflict arises when fragment spreads are involved. If you are checking the precise output of errors (e.g. for unit tests), you may find existing errors change from `"a" and "c" are different fields` to `"c" and "a" are different fields`.
From a perf point of view, this is fairly minor as the memoization "PairSet" was already keeping these repeated checks from consuming time, however this will reduce the number of memoized hits because of the algorithm improvement.
From an error reporting point of view, this reports nearest-common-ancestor issues when found in a fragment that comes later in the validation process. I've added a test which fails with the existing impl and now passes, as well as changed a comment.
This also fixes an error where validation issues could be missed because of an over-eager memoization. I've also modified the `PairSet` to be aware of both forms of memoization, also represented by a previously failing test.
ref: graphql/graphql-js#386
This changes the parsing grammar and validation rules to more correctly implement the current state of the GraphQL SDL proposal (facebook/graphql#90)
ref: graphql/graphl-js#1102
ref: graphql/graphql-js#1000
BREAKING CHANGE: SchemaBuilder::build() and buildAST() and constructor
removed the typedecorator, as not needed anymore as library can now resolve
union and interfaces from generated schemas.
* Generalizes building a value from an AST, since "scalar" could be misleading, and supporting variable values within custom scalar literals can be valuable.
* Replaces isNullish with isInvalid since `null` is a meaningful value as a result of literal parsing.
* Provide reasonable default version of 'parseLiteral'
ref: 714ee980aa
ref: https://github.com/graphql/graphql-js/pull/903
# Conflicts:
# src/Utils/BuildSchema.php
# tests/Utils/BuildSchemaTest.php
* Adds support for resolving union/interface types when using a generated schema
* Move resolveType __typename checking into defaultResolveType
* Clean up existing tests and improve error messages
ref: graphql/graphql-js#947
# Conflicts:
# src/Utils/BuildSchema.php
# tests/Utils/BuildSchemaTest.php
As discussed in facebook/graphql#90
This proposes replacing leading comment blocks as descriptions in the schema definition language with leading strings (typically block strings).
While I think there is some reduced ergonomics of using a string literal instead of a comment to write descriptions (unless perhaps you are accustomed to Python or Clojure), there are some compelling advantages:
* Descriptions are first-class in the AST of the schema definition language.
* Comments can remain "ignored" characters.
* No ambiguity between commented out regions and descriptions.
Specific to this reference implementation, since this is a breaking change and comment descriptions in the experimental SDL have fairly wide usage, I've left the comment description implementation intact and allow it to be enabled via an option. This should help with allowing upgrading with minimal impact on existing codebases and aid in automated transforms.
BREAKING CHANGE: This does not parse descriptions from comments by default anymore and the value of description in Nodes changed from string to StringValueNode
This RFC adds a new form of `StringValue`, the multi-line string, similar to that found in Python and Scala.
A multi-line string starts and ends with a triple-quote:
```
"""This is a triple-quoted string
and it can contain multiple lines"""
```
Multi-line strings are useful for typing literal bodies of text where new lines should be interpretted literally. In fact, the only escape sequence used is `\"""` and `\` is otherwise allowed unescaped. This is beneficial when writing documentation within strings which may reference the back-slash often:
```
"""
In a multi-line string \n and C:\\ are unescaped.
"""
```
The primary value of multi-line strings are to write long-form input directly in query text, in tools like GraphiQL, and as a prerequisite to another pending RFC to allow docstring style documentation in the Schema Definition Language.
Ref: graphql/graphql-js#926
This revert #202 (commit 9d37f4c) because trying to parse PSR-7 request
was a mistake. The whole point of PSR-7 is to allow for interoperability
and be able to use specialized libs for body parsing (amongst many other
things). Trying to parse ourselves would be opening a can of worm if/when
other content types have to be supported. It is more correct and future
safe to require that the body is parsed before being passed to GraphQL.
Because PSR-7 specification only specify that `getParsedBody()` **may**
return the parsed body for `application/json`, we cannot assume that it
is always the case. So if the value returned parsed body is an empty array,
it means we should try to parse it ourselves (`null` would mean no body at
all according to spec).
With this modification we try to used given parsed body, but fallback on
trying to parse the body if necessary. This leave the door open to custom
implementation of parsing if needed, while making it easier to use out of
the box.
