The O language compiler

The O language is Object-Oriented programming language with support of OOP.

Key points about the language.

• Each file should contain a class Main class declaration and method main() is method declaration. It's will be considered as an Entry point of the file.

• Learn about Architecture of the language.

How to run

1. Install dotnet

2. Setup the env

dotnet restore
dotnet build

3. Run(generate executable and run it)

dotnet run --project src/OCompiler -- tests/01_Hello.o
dotnet build/output.dll

4. Learn the flags

Flagname	function
--debug	see clear C# output and validate errors
--emit-dll <name>	generate a .dll executable file
--emit-il	prints an IL for a dotnet executable file
--entry-point <Class>	Specify the class to use as program entry point (this() will be invoked)
--no-codegen	skip an IL code generation
--ast	show an exact AST before and after optimizations
--no-optimize	skip optimizations step
--tokens-only	show parsed tokens from lexer
--tokens-to-file	prints all parsed tokens to a file parsing_results<date>.txt

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Integrated Tests

Correct tests

Filename	Description
01_Hello.o	Minimal valid class with constructor.
02_MaxInt.o	Finds max in array (uses Array.get/Length).
03_ArraySquare.o	Fills an array with squares.
04_InheritanceValid.o	Inheritance and method override.
05_OverloadValid.o	Method overloading by parameter types.
06_GenericsBox.o	Generic class Box[T] with get/set.
07_ConstructorArgs.o	Constructor with argument and field assignment.
08_RecursiveFactorial.o	Recursive method using integer methods.
09_ListAppend.o	Using List[T] append/head.
10_Polymorphism.o	Polymorphism via base reference to derived.

Failed tests

Filename	Description
11_SyntaxError.o	Deliberate missing 'end' to cause syntax error.
12_TypeErrorReturn.o	Method declared Integer returns a Real.
13_FieldAssignment.o	Attempts direct external assignment to a field (should be forbidden).
14_UndefinedMethod.o	Calls a non-existent method on Integer.
15_AmbiguousOverload.o	Two methods with identical signatures (ambiguous).