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State greediness of GraphQL #564

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State greediness of GraphQL #564

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14 changes: 14 additions & 0 deletions spec/Appendix A -- Notation Conventions.md
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Expand Up @@ -43,6 +43,20 @@ ListOfLetterA :
- `a`
- ListOfLetterA `a`

The GraphQL grammar is greedy; this means that given a choice between matching an optional token or a subsequent rule, the optional token prevails. For example, given the following grammar:

Example :
- Letters
- Letters Example

Letters :
- `a` LetterB?
- LetterB

LetterB :: `b`

The sequence of tokens `ab` are matched by a single {Letters} production, rather than two productions matching `a` and `b`, respectively.


## Lexical and Syntactical Grammar

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