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 public int GroupCount {
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70 get { return pattern[0]; }
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73 public IDictionary Mapping {
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74 get { return mapping; }
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75 set { mapping = value; }
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78 private IDictionary mapping;
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79 private ushort[] pattern;
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82 class PatternCompiler : ICompiler {
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83 public static ushort EncodeOp (OpCode op, OpFlags flags) {
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84 return (ushort)((int)op | ((int)flags & 0xff00));
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87 public static void DecodeOp (ushort word, out OpCode op, out OpFlags flags) {
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88 op = (OpCode)(word & 0x00ff);
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89 flags = (OpFlags)(word & 0xff00);
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92 public PatternCompiler () {
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93 pgm = new ArrayList ();
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96 // ICompiler implementation
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98 public void Reset () {
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102 public IMachineFactory GetMachineFactory () {
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103 ushort[] image = new ushort[pgm.Count];
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104 pgm.CopyTo (image);
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106 return new InterpreterFactory (image);
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109 public void EmitFalse () {
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110 Emit (OpCode.False);
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113 public void EmitTrue () {
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114 Emit (OpCode.True);
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117 public void EmitCharacter (char c, bool negate, bool ignore, bool reverse) {
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118 Emit (OpCode.Character, MakeFlags (negate, ignore, reverse, false));
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121 c = Char.ToLower (c);
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126 public void EmitCategory (Category cat, bool negate, bool reverse) {
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127 Emit (OpCode.Category, MakeFlags (negate, false, reverse, false));
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128 Emit ((ushort)cat);
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131 public void EmitRange (char lo, char hi, bool negate, bool ignore, bool reverse) {
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132 Emit (OpCode.Range, MakeFlags (negate, ignore, reverse, false));
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137 public void EmitSet (char lo, BitArray set, bool negate, bool ignore, bool reverse) {
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138 Emit (OpCode.Set, MakeFlags (negate, ignore, reverse, false));
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141 int len = (set.Length + 0xf) >> 4;
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142 Emit ((ushort)len);
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145 while (len -- != 0) {
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147 for (int i = 0; i < 16; ++ i) {
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148 if (b >= set.Length)
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152 word |= (ushort)(1 << i);
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159 public void EmitString (string str, bool ignore, bool reverse) {
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160 Emit (OpCode.String, MakeFlags (false, ignore, reverse, false));
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161 int len = str.Length;
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162 Emit ((ushort)len);
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165 str = str.ToLower ();
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167 for (int i = 0; i < len; ++ i)
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168 Emit ((ushort)str[i]);
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171 public void EmitPosition (Position pos) {
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172 Emit (OpCode.Position, 0);
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173 Emit ((ushort)pos);
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176 public void EmitOpen (int gid) {
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177 Emit (OpCode.Open);
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178 Emit ((ushort)gid);
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181 public void EmitClose (int gid) {
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182 Emit (OpCode.Close);
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183 Emit ((ushort)gid);
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186 public void EmitBalance (int gid, int balance) {
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187 Emit (OpCode.Balance);
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188 Emit ((ushort)gid);
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189 Emit ((ushort)balance);
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192 public void EmitReference (int gid, bool ignore, bool reverse) {
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193 Emit (OpCode.Reference, MakeFlags (false, ignore, reverse, false));
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194 Emit ((ushort)gid);
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197 public void EmitIfDefined (int gid, LinkRef tail) {
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199 Emit (OpCode.IfDefined);
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201 Emit ((ushort)gid);
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204 public void EmitSub (LinkRef tail) {
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210 public void EmitTest (LinkRef yes, LinkRef tail) {
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213 Emit (OpCode.Test);
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218 public void EmitBranch (LinkRef next) {
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220 Emit (OpCode.Branch, 0);
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224 public void EmitJump (LinkRef target) {
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225 BeginLink (target);
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226 Emit (OpCode.Jump, 0);
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230 public void EmitRepeat (int min, int max, bool lazy, LinkRef until) {
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232 Emit (OpCode.Repeat, MakeFlags (false, false, false, lazy));
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234 Emit ((ushort)min);
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235 Emit ((ushort)max);
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238 public void EmitUntil (LinkRef repeat) {
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239 ResolveLink (repeat);
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240 Emit (OpCode.Until);
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243 public void EmitFastRepeat (int min, int max, bool lazy, LinkRef tail) {
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245 Emit (OpCode.FastRepeat, MakeFlags (false, false, false, lazy));
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247 Emit ((ushort)min);
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248 Emit ((ushort)max);
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251 public void EmitIn (LinkRef tail) {
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257 public void EmitAnchor (int offset, LinkRef tail) {
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259 Emit (OpCode.Anchor);
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261 Emit ((ushort)offset);
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264 public void EmitInfo (int count, int min, int max) {
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265 Emit (OpCode.Info);
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266 Emit ((ushort)count);
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267 Emit ((ushort)min);
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268 Emit ((ushort)max);
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271 public LinkRef NewLink () {
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272 return new PatternLinkStack ();
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275 public void ResolveLink (LinkRef lref) {
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276 PatternLinkStack stack = (PatternLinkStack)lref;
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278 while (stack.Pop ())
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279 pgm[stack.OffsetAddress] = (ushort)stack.GetOffset (CurrentAddress);
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284 private static OpFlags MakeFlags (bool negate, bool ignore, bool reverse, bool lazy) {
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286 if (negate) flags |= OpFlags.Negate;
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287 if (ignore) flags |= OpFlags.IgnoreCase;
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288 if (reverse) flags |= OpFlags.RightToLeft;
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289 if (lazy) flags |= OpFlags.Lazy;
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294 private void Emit (OpCode op) {
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295 Emit (op, (OpFlags)0);
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298 private void Emit (OpCode op, OpFlags flags) {
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299 Emit (EncodeOp (op, flags));
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302 private void Emit (ushort word) {
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306 private int CurrentAddress {
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307 get { return pgm.Count; }
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310 private void BeginLink (LinkRef lref) {
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311 PatternLinkStack stack = (PatternLinkStack)lref;
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312 stack.BaseAddress = CurrentAddress;
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315 private void EmitLink (LinkRef lref) {
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316 PatternLinkStack stack = (PatternLinkStack)lref;
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317 stack.OffsetAddress = CurrentAddress;
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318 Emit ((ushort)0); // placeholder
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322 private class PatternLinkStack : LinkStack {
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323 public PatternLinkStack () {
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326 public int BaseAddress {
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327 set { link.base_addr = value; }
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330 public int OffsetAddress {
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331 get { return link.offset_addr; }
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332 set { link.offset_addr = value; }
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335 public int GetOffset (int target_addr) {
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336 return target_addr - link.base_addr;
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339 // LinkStack implementation
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341 protected override object GetCurrent () { return link; }
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342 protected override void SetCurrent (object l) { link = (Link)l; }
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344 private struct Link {
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345 public int base_addr;
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346 public int offset_addr;
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352 private ArrayList pgm;
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355 abstract class LinkStack : LinkRef {
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356 public LinkStack () {
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357 stack = new Stack ();
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360 public void Push () {
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361 stack.Push (GetCurrent ());
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364 public bool Pop () {
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365 if (stack.Count > 0) {
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366 SetCurrent (stack.Pop ());
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373 protected abstract object GetCurrent ();
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374 protected abstract void SetCurrent (object l);
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376 private Stack stack;
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