comparison: parser.cxx
parser.cxx
- changeset 40
- 9e4f785501db
- parent 39
- 07b7ab8080cf
- child 41
- 47e686c96d8f
equal
deleted
inserted
replaced
| 39:07b7ab8080cf | 40:9e4f785501db |
|---|---|
| 62 int g_CurMode = MODE_TOPLEVEL; | 62 int g_CurMode = MODE_TOPLEVEL; |
| 63 str g_CurState = ""; | 63 str g_CurState = ""; |
| 64 bool g_stateSpawnDefined = false; | 64 bool g_stateSpawnDefined = false; |
| 65 bool g_GotMainLoop = false; | 65 bool g_GotMainLoop = false; |
| 66 unsigned int g_BlockStackCursor = 0; | 66 unsigned int g_BlockStackCursor = 0; |
| 67 DataBuffer* g_IfExpression = NULL; | |
| 67 | 68 |
| 68 // ============================================================================ | 69 // ============================================================================ |
| 69 // Main parser code. Begins read of the script file, checks the syntax of it | 70 // Main parser code. Begins read of the script file, checks the syntax of it |
| 70 // and writes the data to the object file via ObjWriter - which also takes care | 71 // and writes the data to the object file via ObjWriter - which also takes care |
| 71 // of necessary buffering so stuff is written in the correct order. | 72 // of necessary buffering so stuff is written in the correct order. |
| 72 void ScriptReader::BeginParse (ObjWriter* w) { | 73 void ScriptReader::BeginParse (ObjWriter* w) { |
| 73 g_BlockStackCursor = 0; | |
| 74 while (Next()) { | 74 while (Next()) { |
| 75 if (!token.icompare ("state")) { | 75 if (!token.icompare ("state")) { |
| 76 MUST_TOPLEVEL | 76 MUST_TOPLEVEL |
| 77 | 77 |
| 78 MustString (); | 78 MustString (); |
| 204 // If | 204 // If |
| 205 if (!token.icompare ("if")) { | 205 if (!token.icompare ("if")) { |
| 206 // Condition | 206 // Condition |
| 207 MustNext ("("); | 207 MustNext ("("); |
| 208 | 208 |
| 209 // Read the expression and write it. | 209 // Read the expression and write it. Store it to memory too for else statements. |
| 210 MustNext (); | 210 MustNext (); |
| 211 DataBuffer* c = ParseExpression (TYPE_INT); | 211 DataBuffer* c = ParseExpression (TYPE_INT); |
| 212 w->WriteBuffer (c); | 212 w->WriteBuffer (c); |
| 213 | 213 |
| 214 MustNext (")"); | 214 MustNext (")"); |
| 215 MustNext ("{"); | 215 MustNext ("{"); |
| 216 | 216 |
| 217 // Add a mark - to here temporarily - and add a reference to it. | |
| 218 // Upon a closing brace, the mark will be adjusted. | |
| 219 unsigned int marknum = w->AddMark (MARKTYPE_IF, ""); | |
| 220 | |
| 221 // Use DH_IFNOTGOTO - if the expression is not true, we goto the mark | 217 // Use DH_IFNOTGOTO - if the expression is not true, we goto the mark |
| 222 // we just defined - and this mark will be at the end of the block. | 218 // we just defined - and this mark will be at the end of the block. |
| 223 w->Write<word> (DH_IFNOTGOTO); | 219 AddBlockMark (w, DH_IFNOTGOTO); |
| 224 w->AddReference (marknum); | |
| 225 | |
| 226 // Store it in the block stack | |
| 227 g_BlockStackCursor++; | |
| 228 blockstack[g_BlockStackCursor] = marknum; | |
| 229 continue; | 220 continue; |
| 230 } | 221 } |
| 231 | 222 |
| 232 if (!token.compare ("}")) { | 223 if (!token.compare ("}")) { |
| 233 // Closing brace | 224 // Closing brace |
| 561 retbuf->Write<word> (dh); | 552 retbuf->Write<word> (dh); |
| 562 retbuf->Write<word> (var->index); | 553 retbuf->Write<word> (var->index); |
| 563 | 554 |
| 564 return retbuf; | 555 return retbuf; |
| 565 } | 556 } |
| 557 | |
| 558 void ScriptReader::AddBlockMark (ObjWriter* w, word dataheader) { | |
| 559 // Add a mark - to here temporarily - and add a reference to it. | |
| 560 // Upon a closing brace, the mark will be adjusted. | |
| 561 unsigned int marknum = w->AddMark (MARKTYPE_IF, ""); | |
| 562 | |
| 563 // Write the header and store reference to the mark | |
| 564 w->Write<word> (dataheader); | |
| 565 w->AddReference (marknum); | |
| 566 | |
| 567 // Store it in the block stack | |
| 568 g_BlockStackCursor++; | |
| 569 blockstack[g_BlockStackCursor] = marknum; | |
| 570 } |
