Index. Comma-separated values (CSV), 30 Conditional expression, 16 Continuous integration (CI), 34 35, 41 Conway s Law, 75 CurrencyPair class,

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1 A AbstractBitmap, 199 Abstract syntax tree (AST) pattern, 116 heterogeneous, 119 homogenous, irregular heterogeneous, 119 normalized heterogeneous, 118 Account type, 165 Android Studio, , 147 Application program interface (API), 30 32, _account_value, 173 import, 172 package, rules and experience, AWS command line interface, 213 project creation, Scala macro package, B Backus-Naus Form (BNF), definition, 60 rules, 63 syntactic analysis, 62 C Comma-separated values (CSV), 30 Conditional expression, 16 Continuous integration (CI), 34 35, 41 Conway s Law, 75 CurrencyPair class, D Data structure array, list, map, 24, 27 set, 24, 26 tuple, 24, Delimiter-direct transaction, 63 DevOps definition, 210 practices, Scala build file, Domain problem EBNF, 104 grammar, 104 JSON parser, 108, parser preparation, rules Pierluigi Riti 2018 P. Riti, Practical Scala DSLs, 221

2 Domain problem (cont.) create language, 104 parser, 107 Domain specific language (DSL), 1, 103 coding, 35 common dictionary creation, 34 definition, 29 design communication, 32 efficiency, 31 encapsulation, 31 goals, implementation, common patterns, 42 grammar and data parsing, 40 sample common dictionary, 41 internal and external difference, model domain, E Embedded heterogeneous tree walker, 119 Expressions conditional, 16 pattern matching multiple conditions, pattern guard, 19 range and loop, types, 15 Extended Backus-Naus Form (EBNF), 99, 102, 104, 111 External DSLs BNF (see Backus-Naus Form (BNF)) creation, 62 ANTLR, 64 context variable, 65 delimiter-direct transaction, 63 grammar, parser, 66, 68 parser generator, 64 recursive descent parser, 64 semantic model, 63, styles, syntactic analysis, syntax-direct translation, 63 grammar, vs. internal DSLs, syntax, F First-class function, 7 Fluent interface, 42, 46, 52, 56 command-query separation, function sequence, 49 side effects, syntax, 48 Forex trading system Account class, 165 BigDecimal,

3 currency pair, dictionary of items, take_profit, , Formal language, 114 Function sequence, 49 G Game engine audio, currentframe, 194 definition, graphic component, GraphicsSystem, 199 ImageRegion, implicit class, 192 playmode, 194 state machine, structure, General-purpose language (GPL), 29 30, 36, 45, 51 GraphicHelper, animation, 193 keys and events, , UpdateCanvas, 192 H Higher-order function, 6 7 HTTP methods, 79 80, 86 87, 89 Hypertext Markup Language (HTML), 30, 32, 38 I Immutable value, 3 5 Internal DSL fluent interface, 45, method chaining, J, K JavaScript Object Notation (JSON), 80, parser, 108, L Language creation define token, reader class, 123 designing, execution, 136 parser component interpreter, 123 reader, 123 translator, 123 patterns designing AST, 116 component, language parser, 115 embedded heterogeneous tree walker, 119 external tree visitor, 120 irregular heterogeneous AST,

4 Language (cont.) normalized heterogeneous AST, 118 phases, translate, 115 recursive descent lexer, 116 tree grammar, 120 tree pattern matcher, 120 semantics, 114 syntax, 114 translator creation, 132 Lexical parser, 105 Loop do while, 22, 24 for, 20 while, 22 Loosely coupled service system, 73 M Metaprogramming, 218 Method chaining, Microservice (μservice) architecture, 73 creation, web API, definition, 73 dissection, 72 designing, REST Microservice, 86 design pillars communication, innovation, 77 the team, 77 DSL coding, filtered languages, 94 global variable technique, 92 JSON, language.conf, language controller, 89, 93 language page, 90 method chaining pattern, 92 routes file, 89 template, 90 text parser creation, 91 features, decision, 78 fine-grained service, 73 loosely coupled service system, 73 play framework installation play template structure, 84 server up and running, 85 starter project selection, 83 sbt build, 84 REST architecture, routes file, 87 Scala design, 83 SOA, 71 solutions, Mobile development Android activity class, 146 activity mobile selection, 143 AndroidManifest.xml, 146 Android Studio, 141 application anatomy, 145 configure menu, 141 Context class, 146 project,

5 Scala plug-in, software development kit (SDK), 140 Scala-Android application activity class, 149 adding scala support, 148 content_main, 150 DSLs, folder layout, 149 MainActivity.scala, 148 onstartcommand method, 158 PracticalScalaDSL, 147 running application, 151 services creation, set up, Scala SDK, 148 WAP, 139 Multiline string, Mutable variable, 3 5 N Naming identifiers, 5 Normalized heterogeneous AST, 118 Numerical data type, 11 O Object-oriented programming, 46, 48 Operating system (OS), 146 Order, P, Q Parser combinator, , 111, 112 Parser generator, 42 Parsing layer designing expression builders, 51 52, 54 fluent interface, 52 functions, 54 context variable, 55 expression builders, 56 nested function, 56 object scoping, 56 reduce errors, 56 variable defined, 55 InsertUser, 52 parser, 53 parser combinator, 54 semantic model, 53 symbol table, Pattern guard, 19 Programming language, 114 R Read evaluate print loop (REPL), 2 3 Recursive descent lexer, 116 Recursive descent recognizers, 115 Representational state transfer (REST) architecture constraints, features performance, 80 portability,

6 Representational state transfer (REST) architecture (cont.) scalability, 80 simplicity of maintenance, 81 HTTP methods, 79, 80 Ruby community, 45 S Scala Android app, 152 bubble sort algorithm, 5 class, 8 9 helper parsers, method and function, 6 7 numerical data type, 11 parser, 107, 112 parser combinator library, singleton object, 9 10 string, syntax, 2 variable and value, 3 5 Semantic model, 42 Service-oriented architecture (SOA), 71, 73, 82 Simple Object Access Protocol (SOAP), 79 Singleton object, 9 10 String interpolation, T Test-driven development (TDD), 212 TradingSystem, Translator code, 132 Tree construction, 66 Tree pattern matcher, 120 Tree grammar, 120 U, V User recognition system, grammar BNF, 98 definition, 98 EBNF, 99 mathematical expression, 98 operators, 99 parsing library, W, X, Y, Z Web Services Description Language (WSDL), Wireless Application Protocol (WAP),