comparison: parser.cxx
parser.cxx
- changeset 61
- 11451e7a2fe6
- parent 59
- 891b9e6ee139
- child 62
- 824ab7b28e3c
equal
deleted
inserted
replaced
| 60:8834e4b6aebd | 61:11451e7a2fe6 |
|---|---|
| 66 bool g_stateSpawnDefined = false; | 66 bool g_stateSpawnDefined = false; |
| 67 bool g_GotMainLoop = false; | 67 bool g_GotMainLoop = false; |
| 68 unsigned int g_ScopeCursor = 0; | 68 unsigned int g_ScopeCursor = 0; |
| 69 DataBuffer* g_IfExpression = NULL; | 69 DataBuffer* g_IfExpression = NULL; |
| 70 bool g_CanElse = false; | 70 bool g_CanElse = false; |
| 71 str* g_UnmarkedLabels[MAX_MARKS]; | |
| 71 | 72 |
| 72 // ============================================================================ | 73 // ============================================================================ |
| 73 // Main parser code. Begins read of the script file, checks the syntax of it | 74 // Main parser code. Begins read of the script file, checks the syntax of it |
| 74 // and writes the data to the object file via ObjWriter - which also takes care | 75 // and writes the data to the object file via ObjWriter - which also takes care |
| 75 // of necessary buffering so stuff is written in the correct order. | 76 // of necessary buffering so stuff is written in the correct order. |
| 76 void ScriptReader::ParseBotScript (ObjWriter* w) { | 77 void ScriptReader::ParseBotScript (ObjWriter* w) { |
| 77 // Zero the entire block stack first | 78 // Zero the entire block stack first |
| 78 for (int i = 0; i < MAX_SCOPE; i++) | 79 for (int i = 0; i < MAX_SCOPE; i++) |
| 79 ZERO(scopestack[i]); | 80 ZERO(scopestack[i]); |
| 80 | 81 |
| 82 for (int i = 0; i < MAX_MARKS; i++) | |
| 83 g_UnmarkedLabels[i] = NULL; | |
| 84 | |
| 81 while (Next()) { | 85 while (Next()) { |
| 82 // Check if else is potentically valid | 86 // Check if else is potentically valid |
| 83 if (!token.compare ("else") && !g_CanElse) | 87 if (!token.compare ("else") && !g_CanElse) |
| 84 ParserError ("else without preceding if"); | 88 ParserError ("else without preceding if"); |
| 85 if (token.compare ("else") != 0) | 89 if (token.compare ("else") != 0) |
| 195 | 199 |
| 196 // Get the name of the label | 200 // Get the name of the label |
| 197 MustNext (); | 201 MustNext (); |
| 198 | 202 |
| 199 // Find the mark this goto statement points to | 203 // Find the mark this goto statement points to |
| 200 // TODO: This should define the mark instead of bombing | |
| 201 // out if the mark isn't found! | |
| 202 unsigned int m = w->FindMark (token); | 204 unsigned int m = w->FindMark (token); |
| 203 if (m == MAX_MARKS) | 205 |
| 204 ParserError ("unknown label `%s`!", token.chars()); | 206 // If not set, define it |
| 207 if (m == MAX_MARKS) { | |
| 208 m = w->AddMark (token); | |
| 209 g_UnmarkedLabels[m] = new str (token); | |
| 210 } | |
| 205 | 211 |
| 206 // Add a reference to the mark. | 212 // Add a reference to the mark. |
| 207 w->Write<word> (DH_GOTO); | 213 w->Write<word> (DH_GOTO); |
| 208 w->AddReference (m); | 214 w->AddReference (m); |
| 209 MustNext (";"); | 215 MustNext (";"); |
| 499 // ============================================================ | 505 // ============================================================ |
| 500 // Label | 506 // Label |
| 501 if (!PeekNext().compare (":")) { | 507 if (!PeekNext().compare (":")) { |
| 502 MUST_NOT_TOPLEVEL | 508 MUST_NOT_TOPLEVEL |
| 503 | 509 |
| 510 // want no conflicts.. | |
| 504 if (IsKeyword (token)) | 511 if (IsKeyword (token)) |
| 505 ParserError ("label name `%s` conflicts with keyword\n", token.chars()); | 512 ParserError ("label name `%s` conflicts with keyword\n", token.chars()); |
| 506 if (FindCommand (token)) | 513 if (FindCommand (token)) |
| 507 ParserError ("label name `%s` conflicts with command name\n", token.chars()); | 514 ParserError ("label name `%s` conflicts with command name\n", token.chars()); |
| 508 if (FindGlobalVariable (token)) | 515 if (FindGlobalVariable (token)) |
| 509 ParserError ("label name `%s` conflicts with variable\n", token.chars()); | 516 ParserError ("label name `%s` conflicts with variable\n", token.chars()); |
| 510 | 517 |
| 511 w->AddMark (token); | 518 // See if the label is already defined but unmarked |
| 519 int mark = -1; | |
| 520 for (int i = 0; i < MAX_MARKS; i++) { | |
| 521 if (g_UnmarkedLabels[i] && !g_UnmarkedLabels[i]->compare (token)) { | |
| 522 mark = i; | |
| 523 w->MoveMark (i); | |
| 524 | |
| 525 // No longer unmarked | |
| 526 delete g_UnmarkedLabels[i]; | |
| 527 g_UnmarkedLabels[i] = NULL; | |
| 528 } | |
| 529 } | |
| 530 | |
| 531 // Not found in unmarked lists, define it now | |
| 532 if (mark == -1) | |
| 533 w->AddMark (token); | |
| 534 | |
| 512 MustNext (":"); | 535 MustNext (":"); |
| 513 continue; | 536 continue; |
| 514 } | 537 } |
| 515 | 538 |
| 516 // ============================================================ | 539 // ============================================================ |
| 629 | 652 |
| 630 // stateSpawn must be defined! | 653 // stateSpawn must be defined! |
| 631 if (!g_stateSpawnDefined) | 654 if (!g_stateSpawnDefined) |
| 632 ParserError ("script must have a state named `stateSpawn`!"); | 655 ParserError ("script must have a state named `stateSpawn`!"); |
| 633 | 656 |
| 657 for (int i = 0; i < MAX_MARKS; i++) | |
| 658 if (g_UnmarkedLabels[i]) | |
| 659 ParserError ("label `%s` is referenced via `goto` but isn't defined\n", g_UnmarkedLabels[i]->chars()); | |
| 660 | |
| 634 // Dump the last state's onenter and mainloop | 661 // Dump the last state's onenter and mainloop |
| 635 w->WriteBuffers (); | 662 w->WriteBuffers (); |
| 636 | 663 |
| 637 // String table | 664 // String table |
| 638 w->WriteStringTable (); | 665 w->WriteStringTable (); |
