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Apollo_Code_Generation [en]
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YuyaHorita
October 09, 2019
Programming
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Apollo_Code_Generation [en]
YuyaHorita
October 09, 2019
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Transcript
Apollo Code Generation
Introduction Yuya Horita iOS Engineer @CyberAgent, 2017/4 ~ 2019/5 Software
Engineer @M3, 2019/5 ~ GitHub: https://github.com/horita-yuya Twitter: https://twitter.com/horita_yuya Medium: https://medium.com/@yuyaHorita
None
schema.json *.graphql ʴ
schema.json File contains the results of an introspection query, or
query information > Conventionally this file is called schema.json Reference: https://www.apollographql.com/docs/ios/downloading-schema/
*.graphql Query definition file
schema.json *.graphql ʴ
schema.json *.graphql Token AST IR →
Lexer .graphql to Tokens
User.graphql
User.graphql Tokens query User ( $ id email @ include
… AddressFragment Debug : response ~~~~~ ~~~~~ ~~~~~ ~~~~~ ~~~~~ ~~~~~ ~~~~~ ~~~~~
query User ( $ @ … AddressFragment NAME Kind Value
undefined undefined undefined undefined COMMENT Debug Ignoring on parsing phase name : undefined
`#` itself is not a token kind. -> Other ways
to comment out, like `/**/`?
https://github.com/graphql/graphql-js/blob/master/src/language/lexer.js#L187 https://github.com/graphql/graphql-spec/issues/276 Reading implementation of lexer, it seems only `#`
indicates comment.
Parser Tokens to AST
query User AddressFragment NAME NAME NAME Operation definition name NAME
Tokens Semantics Operation name field name Fragment name
( $ @ … Beginning of definition of arguments, etc.
Variable Directive Fragment/Inline Fragment Spread Tokens : Argument, Alias, etc. Semantics
NAME Token: Semantics depends on syntax and value. Punctuator Token:
Semantics is fixed or depends on syntax ( $ : @
None
Document Hoge parsing operation function parseHoge is defined in graphql/language/parser.js
= OperationDefinition OperationType Name VariableDefinitions VariableDefinition SelectionSet VariableDefinition Recursive Descent Parsing
Tokens Rules + Starts with operation definition keyword `query`. The
next `User` is operation name. If `(` exists in just after `User`, variable definitions starts. It will end with `)`. Next `{` means the beginning of definition of SelectionSet ……
VariableDefinitions Document OperationDefinition FragmentDefinition AST OperationType VariableDefinition VariableDefinition
IR Generator AST to IR
None
None
None
VariableDefinition Type Variable Name value: string Name value: string
Type Variable Name value: id Name value: Int! VariableDefinitions VariableDefinition
VariableDefinition Type Variable Name value: withEmail Name value: Boolean!
VariableDefinitions VariableDefinition VariableDefinition + schema.json GraphQLType GraphQLType Type Variable Name
value: id Name value: Int! Type Variable Name value: withEmail Name value: Boolean!
IR
IR CompilerContext LegacyCompilerContext
Summary 1. AST from *.graphql. 2. IR from ast and
schema.json. 3. .swift, .ts, .scala from IR 4. It seems .kt doesn’t use apollo-tooling. All implementations are in apollo-android.
Appendix
Lexer Lexer: https://github.com/graphql/graphql-js/blob/master/src/language/lexer.js Token Kind: https://github.com/graphql/graphql-js/blob/master/src/language/tokenKind.js
Parser Parser: https://github.com/graphql/graphql-js/blob/master/src/language/parser.js AST: https://github.com/graphql/graphql-js/blob/master/src/language/ast.js AST Kind: https://github.com/graphql/graphql-js/blob/master/src/language/kinds.js
IR Compiler: https://github.com/apollographql/apollo-tooling/blob/master/packages/apollo-codegen- core/src/compiler/index.ts