graphql-lua

GraphQL Lua

Lua implementation of GraphQL parser using LPeg. Experimental.

Right now it can parse pretty much all of the query syntax:

• Documents
• Definitions
  • OperationDefinition
  • FragmentDefinition
• Selections
• Fields
• Aliases
• Arguments
• FragmentSpreads and InlineFragments
• All value types (scalars, enums, lists, objects, variables).
• Variables (typed)
• Directives

Missing features:

• Validation, error handling
• Comments
• Type definitions, interfaces, etc.
• Introspection
• Execution
• Unicode stuff

Example

require 'parse' [[{
  me {
    firstName
    lastName
  }
}]]

Gives you this scary table:

{
  kind = "document",
  definitions = {
    {
      kind = "operation",
      operation = "query",
      selectionSet = {
        kind = "selectionSet",
        selections = {
          {
            kind = "field",
            name = {
              kind = "name",
              value = "me"
            },
            selectionSet = {
              kind = "selectionSet",
              selections = {
                {
                  kind = "field",
                  name = {
                    kind = "name",
                    value = "firstName"
                  }
                },
                {
                  kind = "field",
                  name = {
                    kind = "name",
                    value = "lastName"
                  }
                }
              }
            }
          }
        }
      }
    }
  }
}

License

MIT