Exemplo n.º 1
0
 public Instruction Match(string code)
 {
     var result = new Instruction();
     foreach (var instruction in Instructions)
     {
         int j = 0;
         bool requiredWhitespaceMet = false;
         bool match = true;
         // Create new result
         result.Match = instruction.Match;
         result.Value = instruction.Value;
         result.Operands = new Dictionary<char, Operand>();
         result.ImmediateValues = new Dictionary<char, ImmediateValue>();
         for (int i = 0; i < instruction.Match.Length; i++, j++)
         {
             if (j >= code.Length)
             {
                 match = false;
                 break;
             }
             if (instruction.Match[i] == '_') // Required whitespace
             {
                 if (requiredWhitespaceMet && char.IsWhiteSpace(code[j]))
                     i--;
                 else if (requiredWhitespaceMet && !char.IsWhiteSpace(code[j]))
                 {
                     requiredWhitespaceMet = false;
                     j--;
                 }
                 else
                 {
                     if (char.IsWhiteSpace(code[j]))
                     {
                         requiredWhitespaceMet = true;
                         i--;
                     }
                     else
                     {
                         match = false;
                         break;
                     }
                 }
             }
             else if (instruction.Match[i] == '-') // Optional whitespace
             {
                 if (char.IsWhiteSpace(code[j]))
                     i--;
                 else
                     j--;
             }
             else if (instruction.Match[i] == '%') // Immediate value
             {
                 char key = instruction.Match[++i]; i += 2;
                 string bitString = "";
                 while (instruction.Match[i] != '>')
                     bitString += instruction.Match[i++];
                 i++; int bits = int.Parse(bitString);
                 // Get value
                 string value = GetOperandValue(instruction, i, code, j);
                 if (value == null)
                 {
                     match = false;
                     break;
                 }
                 j += value.Length - 1;
                 result.ImmediateValues.Add(key, new ImmediateValue
                 {
                     Bits = bits,
                     Value = value
                 });
             }
             else if (instruction.Match[i] == '^') // Relative immediate value
             {
                 char key = instruction.Match[++i]; i += 2;
                 string bitString = "";
                 while (instruction.Match[i] != '>')
                     bitString += instruction.Match[i++];
                 i++; int bits = int.Parse(bitString);
                 // Get value
                 string value = GetOperandValue(instruction, i, code, j);
                 if (value == null)
                 {
                     match = false;
                     break;
                 }
                 j += value.Length - 1;
                 result.ImmediateValues.Add(key, new ImmediateValue
                 {
                     Bits = bits,
                     Value = value,
                     RelativeToPC = true
                 });
             }
             else if (instruction.Match[i] == '&') // RST immediate value
             {
                 char key = instruction.Match[++i];
                 i++;
                 // Get value
                 string value = GetOperandValue(instruction, i, code, j);
                 if (value == null)
                 {
                     match = false;
                     break;
                 }
                 j += value.Length - 1;
                 result.ImmediateValues.Add(key, new ImmediateValue
                 {
                     Bits = 8,
                     Value = value,
                     RstOnly = true
                 });
             }
             else if (instruction.Match[i] == '@')
             {
                 char key = instruction.Match[++i]; i += 2;
                 string group = "";
                 while (instruction.Match[i] != '>')
                     group += instruction.Match[i++];
                 i++; string value = GetOperandValue(instruction, i, code, j);
                 if (value == null)
                 {
                     match = false;
                     break;
                 }
                 value = value.Trim().ToLower();
                 j += value.Length - 1;
                 var operand = GetOperand(OperandGroups[group], value);
                 if (operand == null)
                 {
                     match = false;
                     break;
                 }
                 result.Operands.Add(key, operand);
                 i--;
             }
             else
             {
                 if (instruction.Match[i] != char.ToLower(code[j]))
                 {
                     match = false;
                     break;
                 }
             }
         }
         if (j != code.Length || !match)
             continue;
         // Match found
         return result;
     }
     return null;
 }
Exemplo n.º 2
0
 private string GetOperandValue(Instruction instruction, int i, string code, int j)
 {
     // Get the delimiter
     char? delimiter = null;
     while (i < instruction.Match.Length)
     {
         if (instruction.Match[i] == '-' || instruction.Match[i] == '_')
             i++;
         else
         {
             delimiter = instruction.Match[i];
             break;
         }
     }
     if (delimiter == null)
         return code.Substring(j);
     int index = code.SafeIndexOf(delimiter.Value, j);
     if (index == -1)
         return null;
     return code.Substring(j, index - j);
 }