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Apollo_Code_Generation [jp]
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YuyaHorita
October 09, 2019
Programming
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Apollo_Code_Generation [jp]
YuyaHorita
October 09, 2019
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Transcript
Apollo Code Generation
Introduction ງా ༗࠸ 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 αʔόʔͰఆٛ͞ΕͨQueryใΛؚΉϑΝΠϧ > Conventionally this file is called schema.json Reference:
https://www.apollographql.com/docs/ios/downloading-schema/
*.graphql ΫΤϦఆٛϑΝΠϧ
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 Parse࣌ʹແࢹ͞ΕΔ name : undefined
`#` ͦΕ͕ࣗToken Kindʹͳ͍ͬͯͳ͍ɻ -> `/* */`ͳͲͰɺෳߦίϝϯτͷ༧ײ?
https://github.com/graphql/graphql-js/blob/master/src/language/lexer.js#L187 https://github.com/graphql/graphql-spec/issues/276 Lexerͷ࣮తʹɺݱ࣌Ͱ `#` ͰͷΈίϝϯτՄೳͷ༷
Parser Tokens to AST
query User AddressFragment NAME NAME NAME Operationએݴ name NAME Tokens
ҙຯ Operation໊ field໊ Fragment໊
( $ @ … Argumentએݴͷ։࢝ͳͲ ҙຯ Variable Directive Fragment/Inline Fragment
Spread Tokens : Argument, AliasͳͲ
NAME Token: จ຺ͱvalueʹΑͬͯҙຯ͕มΘΔ Punctuator Token: ݻఆͷҙຯ or จ຺ʹΑͬͯҙຯ͕มΘΔ ( $
: @
None
Document Hoge parseॲཧ function parseHoge ͷ໊લͰgraphql/language/parser.jsʹఆٛ = OperationDefinition OperationType Name
VariableDefinitions VariableDefinition SelectionSet VariableDefinition ࠶ؼԼ߱ߏจղੳ
Operationએݴ `query`͕͋ΓɺOperation໊ `User`ͷޙɺ `(` ͕͋ΕɺҾ(ม)ͷఆ͕ٛ࢝·Γɺ `)` ͕དྷͨΒऴྃɻ ࣍ͷ `{` ͔ΒSelectionSetͷఆ͕ٛ࢝·Γɺɺɺ
Tokens Rules +
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. *.graphql͔ΒASTΛੜ 2. schema.jsonͱরΒ͠߹Θͤͳ͕ΒɺAST͔ΒIRΛੜ 3. IR͔Βɺ.swift, .ts, .scalaΛੜ (
scalaLegacyͷํΛ͍ͬͯΔ ) 4. .ktapollo-toolingΛΘͣɺapollo-androidͰผ࣮?
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