Class: ArSerializer::GraphQL::Parser

Inherits:
Object
  • Object
show all
Defined in:
lib/ar_serializer/graphql/parser.rb

Defined Under Namespace

Classes: ParseError

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(query, operation_name: nil, variables: {}) ⇒ Parser

Returns a new instance of Parser.



5
6
7
8
9
10
 
# File 'lib/ar_serializer/graphql/parser.rb', line 5

def initialize(query, operation_name: nil, variables: {})
  @query = query
  @operation_name = operation_name
  @variables = variables
  @chars = query.chars
end

Instance Attribute Details

#chars ⇒ Object (readonly)

Returns the value of attribute chars.



4
5
6
 
# File 'lib/ar_serializer/graphql/parser.rb', line 4

def chars
  @chars
end

#operation_name ⇒ Object (readonly)

Returns the value of attribute operation_name.



4
5
6
 
# File 'lib/ar_serializer/graphql/parser.rb', line 4

def operation_name
  @operation_name
end

#query ⇒ Object (readonly)

Returns the value of attribute query.



4
5
6
 
# File 'lib/ar_serializer/graphql/parser.rb', line 4

def query
  @query
end

#variables ⇒ Object (readonly)

Returns the value of attribute variables.



4
5
6
 
# File 'lib/ar_serializer/graphql/parser.rb', line 4

def variables
  @variables
end

Class Method Details

.parse(*args) ⇒ Object 



12
13
14
 
# File 'lib/ar_serializer/graphql/parser.rb', line 12

def self.parse(*args)
  new(*args).parse
end

Instance Method Details

#parse ⇒ Object

Raises:



16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
 
# File 'lib/ar_serializer/graphql/parser.rb', line 16

def parse
  definitions = []
  consume_blank
  loop do
    definition = parse_definition
    consume_blank
    consume_text ','
    consume_blank
    break unless definition
    definitions << definition
  end
  raise_expected_not_found 'definition or EOF' unless chars.empty?
  query = definitions.find do |definition|
    next unless definition[:type] == 'query'
    operation_name.nil? || operation_name == definition[:args].first
  end
  raise ParseError, 'empty query' unless query
  fragments = definitions.select { |definition| definition[:type] == 'fragment' }
  fragments_by_name = fragments.index_by { |frag| frag[:args].first }
  embed_fragment query[:fields], fragments_by_name
end