IBadExpressionCompiler.cs

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using BadScript2.Common;
using BadScript2.Parser.Expressions;
 
namespace BadScript2.Runtime.VirtualMachine.Compiler.ExpressionCompilers;
 
public readonly struct BadExpressionCompileContext
{
    public BadCompiler Compiler { get; }
 
    private readonly List<BadInstruction> m_Instructions = new List<BadInstruction>();
    
    public int InstructionCount => m_Instructions.Count;
    private readonly List<int> m_EmptyInstructions = new List<int>();
    public BadInstruction[] GetInstructions()
    {
        if(m_EmptyInstructions.Count > 0)
        {
            throw new BadCompilerException("Unresolved Empty Instructions!");
        }
        
        return m_Instructions.ToArray();
    }
    public BadExpressionCompileContext(BadCompiler compiler)
    {
        Compiler = compiler;
    }
 
    public void Compile(BadExpression expr) => Compiler.Compile(this, expr);
    public void Compile(IEnumerable<BadExpression> exprs, bool clearStack = true) => Compiler.Compile(this, exprs, clearStack);
    
    public void Emit(BadInstruction instruction)
    {
        m_Instructions.Add(instruction);
    }
    public int EmitEmpty()
    {
        int i = m_Instructions.Count;
        m_EmptyInstructions.Add(i);
        m_Instructions.Add(new BadInstruction());
        return i;
    }
    
    public void ResolveEmpty(int index, BadOpCode code, BadSourcePosition position, params object[] args)
    {
        if(m_EmptyInstructions.Contains(index))
        {
            m_Instructions[index] = new BadInstruction(code, position, args);
            m_EmptyInstructions.Remove(index);
        }
        else
        {
            throw new BadCompilerException("Invalid Empty Instruction Index!");
        }
    }
    
    public void EmitRange(IEnumerable<BadInstruction> instructions)
    {
        m_Instructions.AddRange(instructions);
    }
 
    public void Emit(BadOpCode code, BadSourcePosition position, params object[] args)
    {
        Emit(new BadInstruction(code, position, args));
    }
}
 
public interface IBadExpressionCompiler
{
    void Compile(BadExpressionCompileContext context, BadExpression expression);
}