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//
// assembly: System
// namespace: System.Text.RegularExpressions
// file: debug.cs
//
// author: Dan Lewis (dlewis@gmx.co.uk)
// (c) 2002
using System;
using System.Collections;
namespace System.Text.RegularExpressions {
class Disassembler {
public static void DisassemblePattern (ushort[] image) {
DisassembleBlock (image, 0, 0);
}
public static void DisassembleBlock (ushort[] image, int pc, int depth) {
OpCode op;
OpFlags flags;
for (;;) {
if (pc >= image.Length)
return;
PatternCompiler.DecodeOp (image[pc], out op, out flags);
Console.Write (FormatAddress (pc) + ": "); // address
Console.Write (new string (' ', depth * 2)); // indent
Console.Write (DisassembleOp (image, pc)); // instruction
Console.WriteLine ();
int skip;
switch (op) {
case OpCode.False: case OpCode.True: case OpCode.Until:
skip = 1;
break;
case OpCode.Character: case OpCode.Category: case OpCode.Position:
case OpCode.Open: case OpCode.Close: case OpCode.Reference:
case OpCode.Sub: case OpCode.Branch: case OpCode.Jump: case OpCode.In:
skip = 2;
break;
case OpCode.Balance: case OpCode.IfDefined: case OpCode.Range:
case OpCode.Test: case OpCode.Anchor:
skip = 3;
break;
case OpCode.Repeat: case OpCode.FastRepeat: case OpCode.Info:
skip = 4;
break;
case OpCode.String: skip = image[pc + 1] + 2; break;
case OpCode.Set: skip = image[pc + 2] + 3; break;
default:
skip = 1;
break;
}
pc += skip;
}
}
public static string DisassembleOp (ushort[] image, int pc) {
OpCode op;
OpFlags flags;
PatternCompiler.DecodeOp (image[pc], out op, out flags);
string str = op.ToString ();
if (flags != 0)
str += "[" + flags.ToString ("f") + "]";
switch (op) {
case OpCode.False: case OpCode.True: case OpCode.Until:
default:
break;
case OpCode.Info:
str += " " + image[pc + 1];
str += " (" + image[pc + 2] + ", " + image[pc + 3] + ")";
break;
case OpCode.Character:
str += " '" + FormatChar ((char)image[pc + 1]) + "'";
break;
case OpCode.Category:
str += " /" + (Category)image[pc + 1];
break;
case OpCode.Range:
str += " '" + FormatChar ((char)image[pc + 1]) + "', ";
str += " '" + FormatChar ((char)image[pc + 2]) + "'";
break;
case OpCode.Set:
str += " " + FormatSet (image, pc + 1);
break;
case OpCode.String:
str += " '" + ReadString (image, pc + 1) + "'";
break;
case OpCode.Position:
str += " /" + (Position)image[pc + 1];
break;
case OpCode.Open: case OpCode.Close: case OpCode.Reference:
str += " " + image[pc + 1];
break;
case OpCode.Balance:
str += " " + image[pc + 1] + " " + image[pc + 2];
break;
case OpCode.IfDefined: case OpCode.Anchor:
str += " :" + FormatAddress (pc + image[pc + 1]);
str += " " + image[pc + 2];
break;
case OpCode.Sub: case OpCode.Branch: case OpCode.Jump:
case OpCode.In:
str += " :" + FormatAddress (pc + image[pc + 1]);
break;
case OpCode.Test:
str += " :" + FormatAddress (pc + image[pc + 1]);
str += ", :" + FormatAddress (pc + image[pc + 2]);
break;
case OpCode.Repeat: case OpCode.FastRepeat:
str += " :" + FormatAddress (pc + image[pc + 1]);
str += " (" + image[pc + 2] + ", ";
if (image[pc + 3] == 0xffff)
str += "Inf";
else
str += image[pc + 3];
str += ")";
break;
}
return str;
}
// private static members
private static string ReadString (ushort[] image, int pc) {
int len = image[pc];
char[] chars = new char[len];
for (int i = 0; i < len; ++ i)
chars[i] = (char)image[pc + i + 1];
return new string (chars);
}
private static string FormatAddress (int pc) {
return pc.ToString ("x4");
}
private static string FormatSet (ushort[] image, int pc) {
int lo = image[pc ++];
int hi = (image[pc ++] << 4) - 1;
string str = "[";
bool hot = false;
char a = (char)0, b;
for (int i = 0; i <= hi; ++ i) {
bool m = (image[pc + (i >> 4)] & (1 << (i & 0xf))) != 0;
if (m & !hot) { // start of range
a = (char)(lo + i);
hot = true;
}
else if (hot & (!m || i == hi)) { // end of range
b = (char)(lo + i - 1);
str += FormatChar (a);
if (b != a)
str += "-" + FormatChar (b);
hot = false;
}
}
str += "]";
return str;
}
private static string FormatChar (char c) {
if (c == '-' || c == ']')
return "\\" + c;
if (Char.IsLetterOrDigit (c) || Char.IsSymbol (c))
return c.ToString ();
if (Char.IsControl (c)) {
return "^" + (char)('@' + c);
}
return "\\u" + ((int)c).ToString ("x4");
}
}
}
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