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Lab 06: Improved Parameters (3.8)

Introduction

We added support for named and default parameters for funtions and classes. If a value for a parameter with a default value is not given, the compiler completes the default value. Support was also added for explicitly named parameters when calling a function or a cosntructor, allowing parameter reordering.

fn foo(i: Int, j: Int = 42): Int = { i + j }
foo(1) // OK, j has default value
foo(i = 5, j = 7) // OK
foo(j = 5, i = 7) // OK, can reorder named parameters
foo(i = 7) // OK
foo(j = 7) // Wrong, i has no default value
foo() // Wrong, i has no default value

// Wrong, default parameters have to be at the end
foo(i: Int = 5, j: Int): Int = { i + j }

// Similarly for case classes
case class Foo(i: Int, j: Int = 42) extends Bar

Source

The structure of our extension src directory should be as follows:

src/amyc
 ├── Main.scala
 │
 ├── analyzer   
 │    ├── SymbolTable.scala (updated)
 │    ├── NameAnalyzer.scala (updated)
 │    └── TypeChecker.scala
 │
 ├── ast
 │    ├── Identifier.scala
 │    ├── Printer.scala (updated)
 │    └── TreeModule.scala (updated)
 │
 ├── codegen    
 │    ├── CodeGen.scala
 │    ├── CodePrinter.scala
 │    └── Utils.scala
 │
 ├── interpreter
 │    └── Interpreter.scala
 │
 ├── lib
 │    ├── scallion_3.0.6.jar
 │    └── silex_3.0.6.jar
 │
 ├── parsing
 │    ├── Parser.scala (updated)
 │    ├── Lexer.scala
 │    └── Tokens.scala
 │
 ├── utils
 │    ├── AmycFatalError.scala
 │    ├── Context.scala
 │    ├── Document.scala
 │    ├── Pipeline.scala
 │    ├── Position.scala
 │    ├── Reporter.scala
 │    └── UniqueCounter.scala
 │
 └── wasm        
      ├── Function.scala
      ├── Instructions.scala 
      ├── ModulePrinter.scala
      └── Module.scala

Extension examples

We have provided multiple extension examples that are runnable and that use the extension. The structure of our extension examples extension-examples directory should be as follows:

extension-examples/ 	(new)
├── Bank.amy
├── ClassExample.amy
├── FunctionExample.amy
├── List.amy
├── Person.amy
├── Rational.amy
└── TestLists.amy

You can run these examples with the following commands in the sbt terminal :

  • Bank : run library/Std.amy extension-examples/Bank.amy
  • ClassExample : run library/Std.amy extension-examples/ClassExample.amy
  • FunctionExample : run library/Std.amy extension-examples/FunctionExample.amy
  • Person : run library/Std.amy extension-examples/Person.amy
  • Rational : run library/Std.amy extension-examples/Rational.amy
  • TestLists : run library/Std.amy extension-examples/List.amy library/Option.amy extension-examples/TestLists.amy