/
DataListVisitor.cs
54 lines (45 loc) · 1.66 KB
/
DataListVisitor.cs
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using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
namespace Vectrasm
{
public class DataListVisitor : AsmBaseVisitor<IEnumerable<byte>>
{
private ExpressionVisitor m_exprEvaluator;
public DataListVisitor(Dictionary<string, int> constants)
{
m_exprEvaluator = new ExpressionVisitor(constants);
}
public override IEnumerable<byte> VisitDataWordList(AsmParser.DataWordListContext context)
{
foreach (var expr in context.expr())
{
int val = m_exprEvaluator.Visit(expr);
short word = (short)val;
byte hi = (byte)(word >> 8);
byte lo = (byte)(word & 0xFF);
yield return hi;
yield return lo;
}
}
public override IEnumerable<byte> VisitDataByteList(AsmParser.DataByteListContext context)
{
foreach (var data in context.data_byte())
foreach (byte b in Visit(data))
yield return b;
}
public override IEnumerable<byte> VisitDataByteExpr(AsmParser.DataByteExprContext context)
{
int val = m_exprEvaluator.Visit(context.expr());
yield return (byte)val;
}
public override IEnumerable<byte> VisitDataByteString(AsmParser.DataByteStringContext context)
{
string text = context.LITERAL_STRING().GetText();
Debug.Assert(text[0] == '"' && text[text.Length - 1] == '"');
text = text.Substring(1, text.Length - 2);
return (from c in text select (byte)c);
}
}
}