3 // namespace: System.Text.RegularExpressions
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6 // author: Dan Lewis (dlewis@gmx.co.uk)
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10 using System.Collections;
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12 namespace System.Text.RegularExpressions {
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13 abstract class LinkRef {
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17 interface ICompiler {
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19 IMachineFactory GetMachineFactory ();
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21 // instruction emission
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26 // character matching
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28 void EmitCharacter (char c, bool negate, bool ignore, bool reverse);
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29 void EmitCategory (Category cat, bool negate, bool reverse);
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30 void EmitRange (char lo, char hi, bool negate, bool ignore, bool reverse);
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31 void EmitSet (char lo, BitArray set, bool negate, bool ignore, bool reverse);
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35 void EmitString (string str, bool ignore, bool reverse);
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36 void EmitPosition (Position pos);
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37 void EmitOpen (int gid);
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38 void EmitClose (int gid);
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39 void EmitBalance (int gid, int balance);
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40 void EmitReference (int gid, bool ignore, bool reverse);
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44 void EmitIfDefined (int gid, LinkRef tail);
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45 void EmitSub (LinkRef tail);
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46 void EmitTest (LinkRef yes, LinkRef tail);
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47 void EmitBranch (LinkRef next);
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48 void EmitJump (LinkRef target);
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49 void EmitRepeat (int min, int max, bool lazy, LinkRef until);
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50 void EmitUntil (LinkRef repeat);
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51 void EmitIn (LinkRef tail);
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52 void EmitInfo (int count, int min, int max);
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53 void EmitFastRepeat (int min, int max, bool lazy, LinkRef tail);
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54 void EmitAnchor (int offset, LinkRef tail);
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57 void ResolveLink (LinkRef link);
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60 class InterpreterFactory : IMachineFactory {
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61 public InterpreterFactory (ushort[] pattern) {
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62 this.pattern = pattern;
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65 public IMachine NewInstance () {
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66 return new Interpreter (pattern);
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69 private ushort[] pattern;
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72 class PatternCompiler : ICompiler {
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73 public static ushort EncodeOp (OpCode op, OpFlags flags) {
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74 return (ushort)((int)op | ((int)flags & 0xff00));
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77 public static void DecodeOp (ushort word, out OpCode op, out OpFlags flags) {
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78 op = (OpCode)(word & 0x00ff);
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79 flags = (OpFlags)(word & 0xff00);
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82 public PatternCompiler () {
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83 pgm = new ArrayList ();
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86 // ICompiler implementation
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88 public void Reset () {
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92 public IMachineFactory GetMachineFactory () {
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93 ushort[] image = new ushort[pgm.Count];
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96 return new InterpreterFactory (image);
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99 public void EmitFalse () {
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100 Emit (OpCode.False);
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103 public void EmitTrue () {
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104 Emit (OpCode.True);
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107 public void EmitCharacter (char c, bool negate, bool ignore, bool reverse) {
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108 Emit (OpCode.Character, MakeFlags (negate, ignore, reverse, false));
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111 c = Char.ToLower (c);
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116 public void EmitCategory (Category cat, bool negate, bool reverse) {
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117 Emit (OpCode.Category, MakeFlags (negate, false, reverse, false));
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118 Emit ((ushort)cat);
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121 public void EmitRange (char lo, char hi, bool negate, bool ignore, bool reverse) {
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122 Emit (OpCode.Range, MakeFlags (negate, ignore, reverse, false));
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127 public void EmitSet (char lo, BitArray set, bool negate, bool ignore, bool reverse) {
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128 Emit (OpCode.Set, MakeFlags (negate, ignore, reverse, false));
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131 int len = (set.Length + 0xf) >> 4;
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132 Emit ((ushort)len);
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135 while (len -- != 0) {
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137 for (int i = 0; i < 16; ++ i) {
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138 if (b >= set.Length)
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142 word |= (ushort)(1 << i);
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149 public void EmitString (string str, bool ignore, bool reverse) {
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150 Emit (OpCode.String, MakeFlags (false, ignore, reverse, false));
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151 int len = str.Length;
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152 Emit ((ushort)len);
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155 str = str.ToLower ();
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157 for (int i = 0; i < len; ++ i)
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158 Emit ((ushort)str[i]);
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161 public void EmitPosition (Position pos) {
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162 Emit (OpCode.Position, 0);
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163 Emit ((ushort)pos);
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166 public void EmitOpen (int gid) {
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167 Emit (OpCode.Open);
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168 Emit ((ushort)gid);
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171 public void EmitClose (int gid) {
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172 Emit (OpCode.Close);
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173 Emit ((ushort)gid);
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176 public void EmitBalance (int gid, int balance) {
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177 Emit (OpCode.Balance);
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178 Emit ((ushort)gid);
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179 Emit ((ushort)balance);
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182 public void EmitReference (int gid, bool ignore, bool reverse) {
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183 Emit (OpCode.Reference, MakeFlags (false, ignore, reverse, false));
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184 Emit ((ushort)gid);
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187 public void EmitIfDefined (int gid, LinkRef tail) {
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189 Emit (OpCode.IfDefined);
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191 Emit ((ushort)gid);
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194 public void EmitSub (LinkRef tail) {
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200 public void EmitTest (LinkRef yes, LinkRef tail) {
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203 Emit (OpCode.Test);
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208 public void EmitBranch (LinkRef next) {
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210 Emit (OpCode.Branch, 0);
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214 public void EmitJump (LinkRef target) {
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215 BeginLink (target);
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216 Emit (OpCode.Jump, 0);
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220 public void EmitRepeat (int min, int max, bool lazy, LinkRef until) {
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222 Emit (OpCode.Repeat, MakeFlags (false, false, false, lazy));
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224 Emit ((ushort)min);
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225 Emit ((ushort)max);
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228 public void EmitUntil (LinkRef repeat) {
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229 ResolveLink (repeat);
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230 Emit (OpCode.Until);
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233 public void EmitFastRepeat (int min, int max, bool lazy, LinkRef tail) {
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235 Emit (OpCode.FastRepeat, MakeFlags (false, false, false, lazy));
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237 Emit ((ushort)min);
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238 Emit ((ushort)max);
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241 public void EmitIn (LinkRef tail) {
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247 public void EmitAnchor (int offset, LinkRef tail) {
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249 Emit (OpCode.Anchor);
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251 Emit ((ushort)offset);
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254 public void EmitInfo (int count, int min, int max) {
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255 Emit (OpCode.Info);
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256 Emit ((ushort)count);
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257 Emit ((ushort)min);
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258 Emit ((ushort)max);
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261 public LinkRef NewLink () {
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262 return new PatternLinkStack ();
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265 public void ResolveLink (LinkRef lref) {
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266 PatternLinkStack stack = (PatternLinkStack)lref;
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268 while (stack.Pop ())
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269 pgm[stack.OffsetAddress] = (ushort)stack.GetOffset (CurrentAddress);
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274 private static OpFlags MakeFlags (bool negate, bool ignore, bool reverse, bool lazy) {
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276 if (negate) flags |= OpFlags.Negate;
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277 if (ignore) flags |= OpFlags.IgnoreCase;
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278 if (reverse) flags |= OpFlags.RightToLeft;
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279 if (lazy) flags |= OpFlags.Lazy;
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284 private void Emit (OpCode op) {
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285 Emit (op, (OpFlags)0);
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288 private void Emit (OpCode op, OpFlags flags) {
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289 Emit (EncodeOp (op, flags));
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292 private void Emit (ushort word) {
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296 private int CurrentAddress {
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297 get { return pgm.Count; }
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300 private void BeginLink (LinkRef lref) {
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301 PatternLinkStack stack = (PatternLinkStack)lref;
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302 stack.BaseAddress = CurrentAddress;
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305 private void EmitLink (LinkRef lref) {
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306 PatternLinkStack stack = (PatternLinkStack)lref;
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307 stack.OffsetAddress = CurrentAddress;
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308 Emit ((ushort)0); // placeholder
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312 private class PatternLinkStack : LinkStack {
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313 public PatternLinkStack () {
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316 public int BaseAddress {
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317 set { link.base_addr = value; }
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320 public int OffsetAddress {
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321 get { return link.offset_addr; }
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322 set { link.offset_addr = value; }
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325 public int GetOffset (int target_addr) {
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326 return target_addr - link.base_addr;
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329 // LinkStack implementation
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331 protected override object GetCurrent () { return link; }
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332 protected override void SetCurrent (object l) { link = (Link)l; }
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334 private struct Link {
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335 public int base_addr;
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336 public int offset_addr;
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342 private ArrayList pgm;
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345 abstract class LinkStack : LinkRef {
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346 public LinkStack () {
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347 stack = new Stack ();
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350 public void Push () {
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351 stack.Push (GetCurrent ());
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354 public bool Pop () {
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355 if (stack.Count > 0) {
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356 SetCurrent (stack.Pop ());
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363 protected abstract object GetCurrent ();
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364 protected abstract void SetCurrent (object l);
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366 private Stack stack;
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