| [9430] | 1 | // GPDefSyntaxAnalyzerSyn.cs HDO, 2006-08-28
|
|---|
| 2 | // -------------
|
|---|
| 3 | // Table-driven top-down syntax analyzer (G-code interpreter).
|
|---|
| 4 | // Generated by Coco-2 (PGT).
|
|---|
| 5 | //=====================================|========================================
|
|---|
| 6 |
|
|---|
| 7 | // --- call pragma mehts. and exec. sem. acts. after syntax errors? ---
|
|---|
| 8 | #define CONTPRAGMAACTS // !!!must be defined for SG and PGT!!!
|
|---|
| 9 | #undef CONTSEMACTS // should not be defined
|
|---|
| 10 |
|
|---|
| 11 | using System;
|
|---|
| 12 | using System.Text;
|
|---|
| 13 |
|
|---|
| 14 | using Lex = GPDefSyntaxAnalyzerLex;
|
|---|
| 15 | using Sem = GPDefSyntaxAnalyzerSem;
|
|---|
| 16 |
|
|---|
| 17 | public class GPDefSyntaxAnalyzerSyn {
|
|---|
| 18 |
|
|---|
| 19 | public static String MODULENAME = "GPDefSyntaxAnalyzerSyn";
|
|---|
| 20 |
|
|---|
| 21 | // --- G-code instructions ---
|
|---|
| 22 | public enum Instruction {
|
|---|
| 23 | T, TA, TC, TCA, NT, NTA, ANY, ANYA, EPS, EPSA, JMP, RET
|
|---|
| 24 | } // Instruction
|
|---|
| 25 |
|
|---|
| 26 | private const int ROOTPC = 207;
|
|---|
| 27 | private const int LASTTERM = 28;
|
|---|
| 28 | private const int LASTPRAGMA = 29;
|
|---|
| 29 |
|
|---|
| 30 |
|
|---|
| 31 | // --- other constants ---
|
|---|
| 32 | private const int MINERRDIST = 3;
|
|---|
| 33 | private const int MAXSTACKLEN = 100;
|
|---|
| 34 | private const int EOFTOK = 0;
|
|---|
| 35 | private const int FIRSTNONTERM = LASTPRAGMA + 1;
|
|---|
| 36 |
|
|---|
| 37 | public class NTData {
|
|---|
| 38 | public int startPC;
|
|---|
| 39 | public bool del;
|
|---|
| 40 | public Sets.Set256 firstSet;
|
|---|
| 41 | public NTData(int startPC, bool del, Sets.Set256 firstSet) {
|
|---|
| 42 | this.startPC = startPC;
|
|---|
| 43 | this.del = del;
|
|---|
| 44 | this.firstSet = firstSet;
|
|---|
| 45 | } // NTData
|
|---|
| 46 | } // NTData
|
|---|
| 47 |
|
|---|
| 48 | private class GrammarTable {
|
|---|
| 49 | public int[] header = {
|
|---|
| 50 | 212, 28, 29, 41, 3, 0
|
|---|
| 51 | };
|
|---|
| 52 | public byte[] code = {
|
|---|
| 53 | 0, 1, 2, 28, 1, 1, 13, 10, 0, 1, 12, 14, 0, 0,
|
|---|
| 54 | 5, 5, 3, 24, 0, 2, 10, 16, 0, 0, 10, 5, 8, 34,
|
|---|
| 55 | 0, 3, 10, 26, 0, 0, 6, 5, 4, 44, 0, 4, 10, 36,
|
|---|
| 56 | 0, 1, 8, 56, 0, 0, 2, 2, 28, 5, 0, 19, 11, 0,
|
|---|
| 57 | 9, 10, 48, 0, 0, 4, 11, 0, 7, 11, 2, 28, 1, 0,
|
|---|
| 58 | 19, 11, 2, 28, 1, 0, 17, 5, 1, 83, 0, 2, 4, 5,
|
|---|
| 59 | 3, 0, 19, 11, 4, 6, 1, 1, 18, 102, 0, 4, 6, 2,
|
|---|
| 60 | 10, 92, 0, 8, 1, 11, 4, 7, 1, 5, 7, 116, 0, 2,
|
|---|
| 61 | 10, 108, 0, 8, 2, 11, 3, 28, 125, 0, 1, 11, 1, 3,
|
|---|
| 62 | 130, 0, 11, 1, 20, 140, 0, 4, 5, 2, 0, 21, 11, 1,
|
|---|
| 63 | 22, 150, 0, 4, 5, 3, 0, 23, 11, 1, 24, 160, 0, 4,
|
|---|
| 64 | 5, 4, 0, 25, 11, 4, 2, 5, 11, 2, 28, 1, 1, 11,
|
|---|
| 65 | 174, 0, 4, 9, 2, 0, 19, 11, 5, 10, 185, 0, 1, 10,
|
|---|
| 66 | 177, 0, 8, 3, 11, 2, 28, 1, 0, 14, 4, 11, 2, 11,
|
|---|
| 67 | 1, 15, 202, 0, 11, 0, 16, 0, 27, 11, 4, 0, 1, 0,
|
|---|
| 68 | 0, 11
|
|---|
| 69 | };
|
|---|
| 70 | public NTData[] nts = {
|
|---|
| 71 | new NTData( 1, false, new Sets.Set256(0x0002)),
|
|---|
| 72 | new NTData( 61, false, new Sets.Set256(0x0010)),
|
|---|
| 73 | new NTData( 64, false, new Sets.Set256(0x0080)),
|
|---|
| 74 | new NTData( 67, false, new Sets.Set256(0x0000, 0x1000)),
|
|---|
| 75 | new NTData( 73, false, new Sets.Set256(0x0000, 0x1000)),
|
|---|
| 76 | new NTData( 89, false, new Sets.Set256(0x0088, 0x1150)),
|
|---|
| 77 | new NTData( 105, false, new Sets.Set256(0x0088, 0x1150)),
|
|---|
| 78 | new NTData( 119, false, new Sets.Set256(0x0088, 0x1150)),
|
|---|
| 79 | new NTData( 164, false, new Sets.Set256(0x0000, 0x1000)),
|
|---|
| 80 | new NTData( 177, true , new Sets.Set256(0x0000, 0x1000)),
|
|---|
| 81 | new NTData( 188, false, new Sets.Set256(0x0000, 0x1000)),
|
|---|
| 82 | new NTData( 197, false, new Sets.Set256(0x8000, 0x0001))
|
|---|
| 83 | };
|
|---|
| 84 | public Sets.Set256[] epsSets = {
|
|---|
| 85 | new Sets.Set256(0x0000, 0x02a8),
|
|---|
| 86 | new Sets.Set256(0x0000, 0x02ac),
|
|---|
| 87 | new Sets.Set256(0x0000, 0x0008)
|
|---|
| 88 | };
|
|---|
| 89 | public Sets.Set256[] anySets = {
|
|---|
| 90 | new Sets.Set256(0x0000)
|
|---|
| 91 | };
|
|---|
| 92 | public String[] names = {
|
|---|
| 93 | "end of file", "PROBLEM", "END", "EPS", "LOCAL", "NONTERMINALS",
|
|---|
| 94 | "RULES", "SEM", "MAXIMIZE", "MINIMIZE", "TERMINALS", "CONSTRAINTS",
|
|---|
| 95 | "INIT", "CODE", "IN", "SET", "RANGE", "=", "|", ".", "(", ")", "[",
|
|---|
| 96 | "]", "{", "}", ">>", "..", "ident", "source", "GPDefSyntaxAnalyzer",
|
|---|
| 97 | "SemDecl", "SemAction", "NonterminalDecl", "RuleDef", "SynExpr",
|
|---|
| 98 | "SynTerm", "SynFact", "TerminalDecl", "ConstraintDef",
|
|---|
| 99 | "ConstraintRule", "SetDefinition"
|
|---|
| 100 | };
|
|---|
| 101 | } // GrammarTable;
|
|---|
| 102 |
|
|---|
| 103 | private static GrammarTable gt;
|
|---|
| 104 |
|
|---|
| 105 | private static int pc; // G-code counter
|
|---|
| 106 | private static int[] stk; // stack of G-code return adresses
|
|---|
| 107 | private static int sp; // stack pointer
|
|---|
| 108 | private static bool mustRead; // next Lex.token to read
|
|---|
| 109 | private static int altRoot; // root of alternative chain
|
|---|
| 110 | private static bool leaveOrEnter; // leaveCnt > 0 OR enterCnt > 0
|
|---|
| 111 | private static int leaveCnt; // nr. of sem. proc. to leave
|
|---|
| 112 | private static int enterCnt; // nr. of sem. proc. to enter
|
|---|
| 113 | private static int errDist; // current error distance
|
|---|
| 114 | private static int[] stkAtErr; // saved stack at error position
|
|---|
| 115 | private static int[] newSP; // new stack length
|
|---|
| 116 | private static int[] newPC; // pc after recovery
|
|---|
| 117 |
|
|---|
| 118 |
|
|---|
| 119 | public static void GPDefSyntaxAnalyzerSynMethod(Utils.ModuleAction action, out String moduleName) {
|
|---|
| 120 | //-----------------------------------|----------------------------------------
|
|---|
| 121 | moduleName = MODULENAME;
|
|---|
| 122 | switch (action) {
|
|---|
| 123 | case Utils.ModuleAction.getModuleName:
|
|---|
| 124 | return;
|
|---|
| 125 | case Utils.ModuleAction.initModule:
|
|---|
| 126 | Errors.InstallStopParsingMethod(StopParsing);
|
|---|
| 127 | gt = new GrammarTable();
|
|---|
| 128 | stk = new int[MAXSTACKLEN];
|
|---|
| 129 | stkAtErr = new int[MAXSTACKLEN];
|
|---|
| 130 | newSP = new int[LASTTERM + 1];
|
|---|
| 131 | newPC = new int[LASTTERM + 1];
|
|---|
| 132 | break;
|
|---|
| 133 | case Utils.ModuleAction.resetModule:
|
|---|
| 134 | break;
|
|---|
| 135 | case Utils.ModuleAction.cleanupModule:
|
|---|
| 136 | gt = null;
|
|---|
| 137 | stk = null;
|
|---|
| 138 | stkAtErr = null;
|
|---|
| 139 | newSP = null;
|
|---|
| 140 | newPC = null;
|
|---|
| 141 | break;
|
|---|
| 142 | } // switch
|
|---|
| 143 | } // GPDefSyntaxAnalyzerSynMethod
|
|---|
| 144 |
|
|---|
| 145 | private static void Push(int pc) {
|
|---|
| 146 | if (sp < MAXSTACKLEN)
|
|---|
| 147 | stk[sp++] = pc;
|
|---|
| 148 | else
|
|---|
| 149 | Errors.Restriction(MODULENAME, "Push", "parser stack overflow");
|
|---|
| 150 | } // Push
|
|---|
| 151 |
|
|---|
| 152 | private static int Pop() {
|
|---|
| 153 | if (sp > 0)
|
|---|
| 154 | return stk[--sp];
|
|---|
| 155 | else {
|
|---|
| 156 | Errors.CompilerError(MODULENAME, "Pop", "parser stack underflow");
|
|---|
| 157 | return 0;
|
|---|
| 158 | } // else
|
|---|
| 159 | } // Pop
|
|---|
| 160 |
|
|---|
| 161 | private static void GetNextToken() {
|
|---|
| 162 | for (;;) {
|
|---|
| 163 | Lex.GetToken(); // updates Lex.token
|
|---|
| 164 | if (Lex.token <= LASTTERM)
|
|---|
| 165 | return;
|
|---|
| 166 | #if !CONTPRAGMAACTS
|
|---|
| 167 | if (NumOfSynErrors() == 0)
|
|---|
| 168 | #endif
|
|---|
| 169 | Sem.pragmaMethods[Lex.token - LASTTERM - 1]();
|
|---|
| 170 | } // for
|
|---|
| 171 | } // GetNextToken
|
|---|
| 172 |
|
|---|
| 173 | private static int AdrAt(int pc) {
|
|---|
| 174 | return (gt.code[pc - 1] |
|
|---|
| 175 | (gt.code[pc ] << 8));
|
|---|
| 176 | } // AdrAt
|
|---|
| 177 |
|
|---|
| 178 | private static void AdjustPC(ref int pc) {
|
|---|
| 179 | if (pc == 0)
|
|---|
| 180 | return;
|
|---|
| 181 | for (;;)
|
|---|
| 182 | switch ((Instruction)gt.code[pc - 1]) {
|
|---|
| 183 | case Instruction.T:
|
|---|
| 184 | case Instruction.TA:
|
|---|
| 185 | case Instruction.TC:
|
|---|
| 186 | case Instruction.TCA:
|
|---|
| 187 | case Instruction.NT:
|
|---|
| 188 | case Instruction.NTA:
|
|---|
| 189 | case Instruction.ANY:
|
|---|
| 190 | case Instruction.ANYA:
|
|---|
| 191 | case Instruction.EPS:
|
|---|
| 192 | case Instruction.EPSA:
|
|---|
| 193 | return;
|
|---|
| 194 | case Instruction.JMP:
|
|---|
| 195 | pc = AdrAt(pc + 1);
|
|---|
| 196 | break;
|
|---|
| 197 | case Instruction.RET:
|
|---|
| 198 | pc = 0;
|
|---|
| 199 | return;
|
|---|
| 200 | default:
|
|---|
| 201 | pc++; // syn. or sem. action
|
|---|
| 202 | break;
|
|---|
| 203 | } // switch
|
|---|
| 204 | } // AdjustPC
|
|---|
| 205 |
|
|---|
| 206 | private static void GetSymInstr(int pc,
|
|---|
| 207 | out int opcode, out int sy, out int nextPC, out int altPC) {
|
|---|
| 208 | opcode = gt.code[pc - 1];
|
|---|
| 209 | nextPC = 0; // dummy init
|
|---|
| 210 | altPC = 0; // dummy init
|
|---|
| 211 | switch ((Instruction)opcode) {
|
|---|
| 212 | case Instruction.T:
|
|---|
| 213 | case Instruction.TA:
|
|---|
| 214 | case Instruction.TC:
|
|---|
| 215 | case Instruction.TCA:
|
|---|
| 216 | case Instruction.ANYA:
|
|---|
| 217 | case Instruction.EPS:
|
|---|
| 218 | case Instruction.EPSA:
|
|---|
| 219 | sy = gt.code[pc];
|
|---|
| 220 | break;
|
|---|
| 221 | case Instruction.NT:
|
|---|
| 222 | case Instruction.NTA:
|
|---|
| 223 | sy = gt.code[pc] + FIRSTNONTERM;
|
|---|
| 224 | break;
|
|---|
| 225 | default: // ANY, JMP, RET, SEM, SYN
|
|---|
| 226 | sy = 0;
|
|---|
| 227 | break;
|
|---|
| 228 | } // switch
|
|---|
| 229 | switch ((Instruction)opcode) {
|
|---|
| 230 | case Instruction.T:
|
|---|
| 231 | case Instruction.EPS:
|
|---|
| 232 | nextPC = pc + 2;
|
|---|
| 233 | altPC = 0;
|
|---|
| 234 | break;
|
|---|
| 235 | case Instruction.TC:
|
|---|
| 236 | case Instruction.NT:
|
|---|
| 237 | nextPC = pc + 3;
|
|---|
| 238 | altPC = 0;
|
|---|
| 239 | break;
|
|---|
| 240 | case Instruction.TA:
|
|---|
| 241 | case Instruction.ANYA:
|
|---|
| 242 | case Instruction.EPSA:
|
|---|
| 243 | nextPC = pc + 4;
|
|---|
| 244 | altPC = AdrAt(pc + 2);
|
|---|
| 245 | break;
|
|---|
| 246 | case Instruction.TCA:
|
|---|
| 247 | case Instruction.NTA:
|
|---|
| 248 | nextPC = pc + 5;
|
|---|
| 249 | altPC = AdrAt(pc + 2);
|
|---|
| 250 | break;
|
|---|
| 251 | case Instruction.ANY:
|
|---|
| 252 | nextPC = pc + 1;
|
|---|
| 253 | altPC = 0;
|
|---|
| 254 | break;
|
|---|
| 255 | } // switch
|
|---|
| 256 | AdjustPC(ref nextPC);
|
|---|
| 257 | AdjustPC(ref altPC);
|
|---|
| 258 | } // GetSymInstr
|
|---|
| 259 |
|
|---|
| 260 | private static void Fill(int pc, int sp) {
|
|---|
| 261 | int opcode, sy, nextPC, altPC, i;
|
|---|
| 262 | AdjustPC(ref pc);
|
|---|
| 263 | while (pc > 0) {
|
|---|
| 264 | GetSymInstr(pc, out opcode, out sy, out nextPC, out altPC);
|
|---|
| 265 | switch ((Instruction)opcode) {
|
|---|
| 266 | case Instruction.T:
|
|---|
| 267 | case Instruction.TA:
|
|---|
| 268 | case Instruction.TC:
|
|---|
| 269 | case Instruction.TCA:
|
|---|
| 270 | newPC[sy] = pc;
|
|---|
| 271 | newSP[sy] = sp;
|
|---|
| 272 | break;
|
|---|
| 273 | case Instruction.NT:
|
|---|
| 274 | case Instruction.NTA:
|
|---|
| 275 | for (i = 0; i <= LASTTERM; i++)
|
|---|
| 276 | if (Sets.member((ushort)i, gt.nts[sy - FIRSTNONTERM].firstSet)) {
|
|---|
| 277 | newPC[i] = pc;
|
|---|
| 278 | newSP[i] = sp;
|
|---|
| 279 | }
|
|---|
| 280 | if (gt.nts[sy - FIRSTNONTERM].del)
|
|---|
| 281 | Fill(nextPC, sp);
|
|---|
| 282 | break;
|
|---|
| 283 | case Instruction.EPS:
|
|---|
| 284 | case Instruction.EPSA:
|
|---|
| 285 | Fill(nextPC, sp);
|
|---|
| 286 | break;
|
|---|
| 287 | } // switch
|
|---|
| 288 | pc = altPC;
|
|---|
| 289 | } // while
|
|---|
| 290 | } // Fill
|
|---|
| 291 |
|
|---|
| 292 | private static void FillSucc(int pc, int sp) {
|
|---|
| 293 | int opcode, sy, nextPC, altPC;
|
|---|
| 294 | AdjustPC(ref pc);
|
|---|
| 295 | while (pc > 0) {
|
|---|
| 296 | GetSymInstr(pc, out opcode, out sy, out nextPC, out altPC);
|
|---|
| 297 | if (nextPC > 0)
|
|---|
| 298 | Fill(nextPC, sp);
|
|---|
| 299 | pc = altPC;
|
|---|
| 300 | } // while
|
|---|
| 301 | } // FillSucc
|
|---|
| 302 |
|
|---|
| 303 | private static void Triple(int altRoot) {
|
|---|
| 304 | for (int i = 0; i <= LASTTERM; i++) { // clear triple list
|
|---|
| 305 | newPC[i] = 0;
|
|---|
| 306 | newSP[i] = 0;
|
|---|
| 307 | } // for
|
|---|
| 308 | for (int i = 1; i <= sp; i++) { // successors of stacked nt's
|
|---|
| 309 | FillSucc(stk[i - 1], i - 1);
|
|---|
| 310 | Fill(stk[i - 1], i - 1);
|
|---|
| 311 | } // for
|
|---|
| 312 | FillSucc(altRoot, sp); // successors of alt. chain
|
|---|
| 313 | Fill(altRoot, sp); // current alt. chain
|
|---|
| 314 | } // Triple
|
|---|
| 315 |
|
|---|
| 316 | private static void HandleSynErr(ref int pc, ref int altRoot) {
|
|---|
| 317 | int opcode, sy, nextPC, altPC, adjPC, nwSP, eq;
|
|---|
| 318 | bool nameInMsg;
|
|---|
| 319 | String name;
|
|---|
| 320 | StringBuilder msg = new StringBuilder();
|
|---|
| 321 | leaveOrEnter = false;
|
|---|
| 322 | if (errDist >= MINERRDIST) { // --- primary error
|
|---|
| 323 | nameInMsg = false;
|
|---|
| 324 | adjPC = altRoot;
|
|---|
| 325 | AdjustPC(ref adjPC);
|
|---|
| 326 | while (adjPC > 0) {
|
|---|
| 327 | GetSymInstr(adjPC, out opcode, out sy, out nextPC, out altPC);
|
|---|
| 328 | if ( (Instruction)opcode >= Instruction.T &&
|
|---|
| 329 | (Instruction)opcode <= Instruction.NTA ) {
|
|---|
| 330 | if ( gt.names[sy].IndexOf(' ') >= 0 ||
|
|---|
| 331 | !Char.IsLetter(gt.names[sy][0]) )
|
|---|
| 332 | name = "\"" + gt.names[sy] + "\"";
|
|---|
| 333 | else
|
|---|
| 334 | name = gt.names[sy];
|
|---|
| 335 | if (name.IndexOf('{') > -1) // prevent formatting problems in Errors.SynError
|
|---|
| 336 | name = name.Replace("{", "{{");
|
|---|
| 337 | if (name.IndexOf('}') > -1) // prevent formatting problems in Errors.SynError
|
|---|
| 338 | name = name.Replace("}", "}}");
|
|---|
| 339 | if (msg.Length + name.Length + 2 > 80) {
|
|---|
| 340 | msg.Append(" ...");
|
|---|
| 341 | break;
|
|---|
| 342 | } // if
|
|---|
| 343 | if (!nameInMsg) {
|
|---|
| 344 | nameInMsg = true;
|
|---|
| 345 | msg.Append("expected: " + name);
|
|---|
| 346 | } else {
|
|---|
| 347 | msg.Append(", ");
|
|---|
| 348 | msg.Append(name);
|
|---|
| 349 | } // else
|
|---|
| 350 | } // if
|
|---|
| 351 | adjPC = altPC;
|
|---|
| 352 | } // while
|
|---|
| 353 | if (!nameInMsg)
|
|---|
| 354 | msg.Append("syntax error");
|
|---|
| 355 | Errors.SynError(Lex.tokenLine, Lex.tokenCol, msg.ToString(), "");
|
|---|
| 356 | Triple(altRoot);
|
|---|
| 357 | while (newPC[Lex.token] == 0) {
|
|---|
| 358 | GetNextToken(); // may result in a call to StopParsing
|
|---|
| 359 | if (leaveOrEnter)
|
|---|
| 360 | return;
|
|---|
| 361 | } // while
|
|---|
| 362 | nwSP = newSP[Lex.token];
|
|---|
| 363 | leaveCnt = sp - nwSP;
|
|---|
| 364 | enterCnt = 0;
|
|---|
| 365 | Array.Copy(stk, stkAtErr, stk.Length); // save stack
|
|---|
| 366 | } else { // --- spurios error
|
|---|
| 367 | if (errDist == 0) { // no token used since last error
|
|---|
| 368 | GetNextToken(); // may result in a call to StopParsing
|
|---|
| 369 | if (leaveOrEnter)
|
|---|
| 370 | return;
|
|---|
| 371 | } // if
|
|---|
| 372 | while (newPC[Lex.token] == 0) {
|
|---|
| 373 | GetNextToken(); // may result in a call to StopParsing
|
|---|
| 374 | if (leaveOrEnter)
|
|---|
| 375 | return;
|
|---|
| 376 | } // while
|
|---|
| 377 | nwSP = newSP[Lex.token];
|
|---|
| 378 | eq = 2; // compare stkAtErr and stk
|
|---|
| 379 | while (eq <= sp && eq <= nwSP && stkAtErr[eq - 1] == stk[eq - 1])
|
|---|
| 380 | eq++;
|
|---|
| 381 | eq--; // stacks are equal up to index eq
|
|---|
| 382 | leaveCnt = sp - eq;
|
|---|
| 383 | if (nwSP < eq) {
|
|---|
| 384 | leaveCnt = sp - nwSP;
|
|---|
| 385 | enterCnt = 0;
|
|---|
| 386 | } else if (nwSP > eq)
|
|---|
| 387 | enterCnt = nwSP - eq;
|
|---|
| 388 | else // nwSP == eq
|
|---|
| 389 | enterCnt = 0;
|
|---|
| 390 | Array.Copy(stkAtErr, stk, stk.Length); // restore stack
|
|---|
| 391 | } // else
|
|---|
| 392 | leaveOrEnter = (leaveCnt + enterCnt) > 0;
|
|---|
| 393 | sp = nwSP;
|
|---|
| 394 | pc = newPC[Lex.token];
|
|---|
| 395 | altRoot = pc;
|
|---|
| 396 | errDist = 0;
|
|---|
| 397 | } // HandleSynErr
|
|---|
| 398 |
|
|---|
| 399 | public static int Interpret() {
|
|---|
| 400 | //-----------------------------------|----------------------------------------
|
|---|
| 401 | int actionNr, opcode, currPC;
|
|---|
| 402 | for (;;) {
|
|---|
| 403 | opcode = gt.code[pc - 1];
|
|---|
| 404 | if ( !leaveOrEnter && mustRead &&
|
|---|
| 405 | (Instruction)opcode <= Instruction.EPSA ) {
|
|---|
| 406 | GetNextToken();
|
|---|
| 407 | mustRead = false;
|
|---|
| 408 | errDist++;
|
|---|
| 409 | altRoot = pc;
|
|---|
| 410 | } // if
|
|---|
| 411 | if (leaveOrEnter) {
|
|---|
| 412 | if (leaveCnt > 0) {
|
|---|
| 413 | leaveCnt--;
|
|---|
| 414 | actionNr = 0;
|
|---|
| 415 | } else { // enterCnt > 0
|
|---|
| 416 | enterCnt--;
|
|---|
| 417 | actionNr = gt.code[stkAtErr[sp - enterCnt - 1] - 2];
|
|---|
| 418 | } // else
|
|---|
| 419 | leaveOrEnter = (leaveCnt + enterCnt) > 0;
|
|---|
| 420 | return actionNr;
|
|---|
| 421 | } // if
|
|---|
| 422 | pc++;
|
|---|
| 423 | switch ((Instruction)opcode) {
|
|---|
| 424 | case Instruction.T:
|
|---|
| 425 | if (Lex.token == gt.code[pc - 1])
|
|---|
| 426 | if (Lex.token != EOFTOK) {
|
|---|
| 427 | pc++;
|
|---|
| 428 | mustRead = true;
|
|---|
| 429 | } else {
|
|---|
| 430 | return 0;
|
|---|
| 431 | } // else
|
|---|
| 432 | else
|
|---|
| 433 | HandleSynErr(ref pc, ref altRoot);
|
|---|
| 434 | break;
|
|---|
| 435 | case Instruction.TA:
|
|---|
| 436 | if (Lex.token == gt.code[pc - 1]) {
|
|---|
| 437 | pc += 3;
|
|---|
| 438 | mustRead = true;
|
|---|
| 439 | } else
|
|---|
| 440 | pc = AdrAt(pc + 1); // try alternative
|
|---|
| 441 | break;
|
|---|
| 442 | case Instruction.TC:
|
|---|
| 443 | if (Lex.token == gt.code[pc - 1]) {
|
|---|
| 444 | pc += 2;
|
|---|
| 445 | mustRead = true;
|
|---|
| 446 | actionNr = gt.code[pc - 2];
|
|---|
| 447 | return actionNr;
|
|---|
| 448 | } else
|
|---|
| 449 | HandleSynErr(ref pc, ref altRoot);
|
|---|
| 450 | break;
|
|---|
| 451 | case Instruction.TCA:
|
|---|
| 452 | if (Lex.token == gt.code[pc - 1]) {
|
|---|
| 453 | pc += 4;
|
|---|
| 454 | mustRead = true;
|
|---|
| 455 | actionNr = gt.code[pc - 2];
|
|---|
| 456 | return actionNr;
|
|---|
| 457 | } else
|
|---|
| 458 | pc = AdrAt(pc + 1); // try alternative
|
|---|
| 459 | break;
|
|---|
| 460 | case Instruction.NT:
|
|---|
| 461 | currPC = gt.code[pc - 1];
|
|---|
| 462 | if ( gt.nts[currPC].del ||
|
|---|
| 463 | Sets.member((ushort)Lex.token, gt.nts[currPC].firstSet) ) {
|
|---|
| 464 | pc++;
|
|---|
| 465 | actionNr = gt.code[pc - 1];
|
|---|
| 466 | Push(pc + 1);
|
|---|
| 467 | pc = gt.nts[currPC].startPC;
|
|---|
| 468 | altRoot = pc;
|
|---|
| 469 | return actionNr;
|
|---|
| 470 | } else
|
|---|
| 471 | HandleSynErr(ref pc, ref altRoot);
|
|---|
| 472 | break;
|
|---|
| 473 | case Instruction.NTA:
|
|---|
| 474 | currPC = gt.code[pc - 1];
|
|---|
| 475 | if (Sets.member((ushort)Lex.token, gt.nts[currPC].firstSet)) {
|
|---|
| 476 | pc += 3;
|
|---|
| 477 | actionNr = gt.code[pc - 1];
|
|---|
| 478 | Push(pc + 1);
|
|---|
| 479 | pc = gt.nts[currPC].startPC;
|
|---|
| 480 | altRoot = pc;
|
|---|
| 481 | return actionNr;
|
|---|
| 482 | } else
|
|---|
| 483 | pc = AdrAt(pc + 1);
|
|---|
| 484 | break;
|
|---|
| 485 | case Instruction.ANY:
|
|---|
| 486 | mustRead = true;
|
|---|
| 487 | break;
|
|---|
| 488 | case Instruction.ANYA:
|
|---|
| 489 | currPC = gt.code[pc - 1];
|
|---|
| 490 | if (Sets.member((ushort)Lex.token, gt.anySets[currPC - 1])) {
|
|---|
| 491 | pc += 3;
|
|---|
| 492 | mustRead = true;
|
|---|
| 493 | } else
|
|---|
| 494 | pc = AdrAt(pc + 1);
|
|---|
| 495 | break;
|
|---|
| 496 | case Instruction.EPS:
|
|---|
| 497 | currPC = gt.code[pc - 1];
|
|---|
| 498 | if (Sets.member((ushort)Lex.token, gt.epsSets[currPC - 1]))
|
|---|
| 499 | pc++;
|
|---|
| 500 | else
|
|---|
| 501 | HandleSynErr(ref pc, ref altRoot);
|
|---|
| 502 | break;
|
|---|
| 503 | case Instruction.EPSA:
|
|---|
| 504 | currPC = gt.code[pc - 1];
|
|---|
| 505 | if (Sets.member((ushort)Lex.token, gt.epsSets[currPC - 1]))
|
|---|
| 506 | pc += 3;
|
|---|
| 507 | else
|
|---|
| 508 | pc = AdrAt(pc + 1);
|
|---|
| 509 | break;
|
|---|
| 510 | case Instruction.JMP:
|
|---|
| 511 | pc = AdrAt(pc);
|
|---|
| 512 | break;
|
|---|
| 513 | case Instruction.RET:
|
|---|
| 514 | pc = Pop();
|
|---|
| 515 | altRoot = pc;
|
|---|
| 516 | return 0;
|
|---|
| 517 | default:
|
|---|
| 518 | if (opcode <= 128) {
|
|---|
| 519 | #if !CONTSEMACTS
|
|---|
| 520 | if (Errors.NumOfSynErrors() == 0)
|
|---|
| 521 | #endif
|
|---|
| 522 | return opcode - 12;
|
|---|
| 523 | } else // opcode > 128
|
|---|
| 524 | return opcode - 128;
|
|---|
| 525 | break;
|
|---|
| 526 | } // switch
|
|---|
| 527 | } // for
|
|---|
| 528 | } // Interpret
|
|---|
| 529 |
|
|---|
| 530 |
|
|---|
| 531 | public static bool Parse() {
|
|---|
| 532 | //-----------------------------------|----------------------------------------
|
|---|
| 533 | Lex.InitLex();
|
|---|
| 534 | sp = 0;
|
|---|
| 535 | pc = ROOTPC;
|
|---|
| 536 | altRoot = pc;
|
|---|
| 537 | mustRead = true;
|
|---|
| 538 | errDist = MINERRDIST + 1;
|
|---|
| 539 | leaveOrEnter = false;
|
|---|
| 540 | leaveCnt = 0;
|
|---|
| 541 | enterCnt = 0;
|
|---|
| 542 | Sem.StartSem();
|
|---|
| 543 | return Errors.NumOfSynErrors() == 0;
|
|---|
| 544 | } // Parse
|
|---|
| 545 |
|
|---|
| 546 |
|
|---|
| 547 | public static void StopParsing() {
|
|---|
| 548 | //-----------------------------------|----------------------------------------
|
|---|
| 549 | leaveCnt = sp + 1;
|
|---|
| 550 | enterCnt = 0;
|
|---|
| 551 | leaveOrEnter = true;
|
|---|
| 552 | } // StopParsing
|
|---|
| 553 |
|
|---|
| 554 | } // GPDefSyntaxAnalyzerSyn
|
|---|
| 555 |
|
|---|
| 556 | // End of GPDefSyntaxAnalyzerSyn.cs
|
|---|
| 557 | //=====================================|========================================
|
|---|
