2 * Acess2 - SpiderScript
8 #include <spiderscript.h>
9 #define WANT_TOKEN_STRINGS 1
16 tAST_Script *Parse_Buffer(tSpiderVariant *Variant, char *Buffer);
17 tAST_Node *Parse_DoCodeBlock(tParser *Parser);
18 tAST_Node *Parse_DoBlockLine(tParser *Parser);
19 tAST_Node *Parse_GetVarDef(tParser *Parser, int Type);
21 tAST_Node *Parse_DoExpr0(tParser *Parser); // Assignment
22 tAST_Node *Parse_DoExpr1(tParser *Parser); // Boolean Operators
23 tAST_Node *Parse_DoExpr2(tParser *Parser); // Comparison Operators
24 tAST_Node *Parse_DoExpr3(tParser *Parser); // Bitwise Operators
25 tAST_Node *Parse_DoExpr4(tParser *Parser); // Bit Shifts
26 tAST_Node *Parse_DoExpr5(tParser *Parser); // Arithmatic
27 tAST_Node *Parse_DoExpr6(tParser *Parser); // Mult & Div
29 tAST_Node *Parse_DoParen(tParser *Parser); // Parenthesis (Always Last)
30 tAST_Node *Parse_DoValue(tParser *Parser); // Values
32 tAST_Node *Parse_GetString(tParser *Parser);
33 tAST_Node *Parse_GetNumeric(tParser *Parser);
34 tAST_Node *Parse_GetVariable(tParser *Parser);
35 tAST_Node *Parse_GetIdent(tParser *Parser);
37 void SyntaxAssert(tParser *Parser, int Have, int Want);
39 #define TODO(Parser, message...) do {\
40 fprintf(stderr, "TODO: "message);\
41 longjmp(Parser->JmpTarget, -1);\
46 * \brief Parse a buffer into a syntax tree
48 tAST_Script *Parse_Buffer(tSpiderVariant *Variant, char *Buffer)
51 tParser *Parser = &parser; //< Keeps code consistent
59 printf("Parse_Buffer: (Variant=%p, Buffer=%p)\n", Variant, Buffer);
63 parser.LastToken = -1;
64 parser.NextToken = -1;
66 parser.BufStart = Buffer;
67 parser.CurPos = Buffer;
69 ret = AST_NewScript();
70 mainCode = AST_NewCodeBlock();
72 // Give us an error fallback
73 if( setjmp( parser.JmpTarget ) != 0 )
75 AST_FreeNode( mainCode );
80 while(Parser->Token != TOK_EOF)
82 switch( GetToken(Parser) )
87 // Typed variables/functions
88 case TOKEN_GROUP_TYPES:
91 TOKEN_GET_DATATYPE(type, Parser->Token);
93 tok = GetToken(Parser);
94 // Define a function (pass on to the other function definition code)
95 if( tok == TOK_IDENT ) {
99 else if( tok == TOK_VARIABLE ) {
100 AST_AppendNode( mainCode, Parse_GetVarDef(Parser, type) );
101 SyntaxAssert(Parser, GetToken(Parser), TOK_SEMICOLON);
104 fprintf(stderr, "ERROR: Unexpected %s, expected TOK_IDENT or TOK_VARIABLE\n",
105 csaTOKEN_NAMES[tok]);
111 case TOK_RWD_FUNCTION:
112 if( !Variant->bDyamicTyped ) {
113 fprintf(stderr, "ERROR: Dynamic functions are invalid in static mode\n");
114 longjmp(Parser->JmpTarget, -1);
116 type = SS_DATATYPE_DYNAMIC;
117 SyntaxAssert(Parser, GetToken(Parser), TOK_IDENT );
119 name = strndup( Parser->TokenStr, Parser->TokenLen );
120 fcn = AST_AppendFunction( ret, name );
122 printf("DefFCN %s\n", name);
127 SyntaxAssert(Parser, GetToken(Parser), TOK_PAREN_OPEN );
128 if( LookAhead(Parser) != TOK_PAREN_CLOSE )
131 type = SS_DATATYPE_DYNAMIC;
133 // Non dynamic typed variants must use data types
134 if( !Variant->bDyamicTyped ) {
135 TOKEN_GET_DATATYPE(type, Parser->Token);
138 AST_AppendFunctionArg(fcn, Parse_GetVarDef(Parser, type));
139 } while(GetToken(Parser) == TOK_COMMA);
143 SyntaxAssert(Parser, Parser->Token, TOK_PAREN_CLOSE );
145 AST_SetFunctionCode( fcn, Parse_DoCodeBlock(Parser) );
150 AST_AppendNode( mainCode, Parse_DoBlockLine(Parser) );
155 fcn = AST_AppendFunction( ret, "" );
156 AST_SetFunctionCode( fcn, mainCode );
158 //printf("---- %p parsed as SpiderScript ----\n", Buffer);
164 * \brief Parse a block of code surrounded by { }
166 tAST_Node *Parse_DoCodeBlock(tParser *Parser)
170 // Check if we are being called for a one-liner
171 if( GetToken(Parser) != TOK_BRACE_OPEN ) {
173 return Parse_DoBlockLine(Parser);
176 ret = AST_NewCodeBlock();
178 while( LookAhead(Parser) != TOK_BRACE_CLOSE )
180 AST_AppendNode( ret, Parse_DoBlockLine(Parser) );
182 GetToken(Parser); // Omnomnom
187 * \brief Parse a line in a block
189 tAST_Node *Parse_DoBlockLine(tParser *Parser)
193 //printf("Parse_DoBlockLine: Line %i\n", Parser->CurLine);
195 switch(LookAhead(Parser))
202 // Return from a method
204 //printf("return\n");
206 ret = AST_NewUniOp(Parser, NODETYPE_RETURN, Parse_DoExpr0(Parser));
209 // Control Statements
212 tAST_Node *cond, *true, *false = NULL;
213 GetToken(Parser); // eat the if
214 SyntaxAssert(Parser, GetToken(Parser), TOK_PAREN_OPEN);
215 cond = Parse_DoExpr0(Parser); // Get condition
216 SyntaxAssert(Parser, GetToken(Parser), TOK_PAREN_CLOSE);
217 true = Parse_DoCodeBlock(Parser);
218 if( LookAhead(Parser) == TOK_RWD_ELSE ) {
220 false = Parse_DoCodeBlock(Parser);
222 ret = AST_NewIf(Parser, cond, true, false);
228 tAST_Node *init=NULL, *cond=NULL, *inc=NULL, *code;
229 GetToken(Parser); // Eat 'for'
230 SyntaxAssert(Parser, GetToken(Parser), TOK_PAREN_OPEN);
232 if(LookAhead(Parser) != TOK_SEMICOLON)
233 init = Parse_DoExpr0(Parser);
235 SyntaxAssert(Parser, GetToken(Parser), TOK_SEMICOLON);
236 if(LookAhead(Parser) != TOK_SEMICOLON)
237 cond = Parse_DoExpr0(Parser);
239 SyntaxAssert(Parser, GetToken(Parser), TOK_SEMICOLON);
240 if(LookAhead(Parser) != TOK_SEMICOLON)
241 inc = Parse_DoExpr0(Parser);
243 SyntaxAssert(Parser, GetToken(Parser), TOK_PAREN_CLOSE);
245 code = Parse_DoCodeBlock(Parser);
246 ret = AST_NewLoop(Parser, init, 0, cond, inc, code);
252 TODO(Parser, "Implement do and while\n");
256 case TOKEN_GROUP_TYPES:
260 switch(GetToken(Parser))
262 case TOK_RWD_INTEGER: type = SS_DATATYPE_INTEGER; break;
263 case TOK_RWD_OBJECT: type = SS_DATATYPE_OBJECT; break;
264 case TOK_RWD_REAL: type = SS_DATATYPE_REAL; break;
265 case TOK_RWD_STRING: type = SS_DATATYPE_STRING; break;
268 SyntaxAssert(Parser, GetToken(Parser), TOK_VARIABLE);
270 ret = Parse_GetVarDef(Parser, type);
277 ret = Parse_DoExpr0(Parser);
281 SyntaxAssert(Parser, GetToken(Parser), TOK_SEMICOLON );
286 * \brief Get a variable definition
288 tAST_Node *Parse_GetVarDef(tParser *Parser, int Type)
290 char name[Parser->TokenLen];
293 SyntaxAssert(Parser, Parser->Token, TOK_VARIABLE);
295 // copy the name (trimming the $)
296 memcpy(name, Parser->TokenStr+1, Parser->TokenLen-1);
297 name[Parser->TokenLen-1] = 0;
298 // Define the variable
299 ret = AST_NewDefineVar(Parser, Type, name);
301 while( LookAhead(Parser) == TOK_SQUARE_OPEN )
304 AST_AppendNode(ret, Parse_DoExpr0(Parser));
305 SyntaxAssert(Parser, GetToken(Parser), TOK_SQUARE_CLOSE);
311 * \brief Assignment Operations
313 tAST_Node *Parse_DoExpr0(tParser *Parser)
315 tAST_Node *ret = Parse_DoExpr1(Parser);
318 switch(LookAhead(Parser))
321 GetToken(Parser); // Eat Token
322 ret = AST_NewAssign(Parser, NODETYPE_NOP, ret, Parse_DoExpr0(Parser));
326 GetToken(Parser); // Eat Token
327 ret = AST_NewAssign(Parser, NODETYPE_DIVIDE, ret, Parse_DoExpr0(Parser));
330 GetToken(Parser); // Eat Token
331 ret = AST_NewAssign(Parser, NODETYPE_MULTIPLY, ret, Parse_DoExpr0(Parser));
336 printf("Parse_DoExpr0: Parser->Token = %i\n", Parser->Token);
344 * \brief Logical/Boolean Operators
346 tAST_Node *Parse_DoExpr1(tParser *Parser)
348 tAST_Node *ret = Parse_DoExpr2(Parser);
350 switch(GetToken(Parser))
353 ret = AST_NewBinOp(Parser, NODETYPE_LOGICALAND, ret, Parse_DoExpr1(Parser));
356 ret = AST_NewBinOp(Parser, NODETYPE_LOGICALOR, ret, Parse_DoExpr1(Parser));
359 ret = AST_NewBinOp(Parser, NODETYPE_LOGICALXOR, ret, Parse_DoExpr1(Parser));
368 // --------------------
369 // Expression 2 - Comparison Operators
370 // --------------------
371 tAST_Node *Parse_DoExpr2(tParser *Parser)
373 tAST_Node *ret = Parse_DoExpr3(Parser);
376 switch(GetToken(Parser))
379 ret = AST_NewBinOp(Parser, NODETYPE_EQUALS, ret, Parse_DoExpr2(Parser));
382 ret = AST_NewBinOp(Parser, NODETYPE_LESSTHAN, ret, Parse_DoExpr2(Parser));
385 ret = AST_NewBinOp(Parser, NODETYPE_GREATERTHAN, ret, Parse_DoExpr2(Parser));
395 * \brief Bitwise Operations
397 tAST_Node *Parse_DoExpr3(tParser *Parser)
399 tAST_Node *ret = Parse_DoExpr4(Parser);
402 switch(GetToken(Parser))
405 ret = AST_NewBinOp(Parser, NODETYPE_BWOR, ret, Parse_DoExpr3(Parser));
408 ret = AST_NewBinOp(Parser, NODETYPE_BWAND, ret, Parse_DoExpr3(Parser));
411 ret = AST_NewBinOp(Parser, NODETYPE_BWXOR, ret, Parse_DoExpr3(Parser));
420 // --------------------
421 // Expression 4 - Shifts
422 // --------------------
423 tAST_Node *Parse_DoExpr4(tParser *Parser)
425 tAST_Node *ret = Parse_DoExpr5(Parser);
427 switch(GetToken(Parser))
430 ret = AST_NewBinOp(Parser, NODETYPE_BITSHIFTLEFT, ret, Parse_DoExpr5(Parser));
433 ret = AST_NewBinOp(Parser, NODETYPE_BITSHIFTRIGHT, ret, Parse_DoExpr5(Parser));
443 // --------------------
444 // Expression 5 - Arithmatic
445 // --------------------
446 tAST_Node *Parse_DoExpr5(tParser *Parser)
448 tAST_Node *ret = Parse_DoExpr6(Parser);
450 switch(GetToken(Parser))
453 ret = AST_NewBinOp(Parser, NODETYPE_ADD, ret, Parse_DoExpr5(Parser));
456 ret = AST_NewBinOp(Parser, NODETYPE_SUBTRACT, ret, Parse_DoExpr5(Parser));
466 // --------------------
467 // Expression 6 - Multiplcation & Division
468 // --------------------
469 tAST_Node *Parse_DoExpr6(tParser *Parser)
471 tAST_Node *ret = Parse_DoParen(Parser);
473 switch(GetToken(Parser))
476 ret = AST_NewBinOp(Parser, NODETYPE_MULTIPLY, ret, Parse_DoExpr6(Parser));
479 ret = AST_NewBinOp(Parser, NODETYPE_DIVIDE, ret, Parse_DoExpr6(Parser));
490 // --------------------
491 // 2nd Last Expression - Parens
492 // --------------------
493 tAST_Node *Parse_DoParen(tParser *Parser)
496 printf("Parse_DoParen: (Parser=%p)\n", Parser);
498 if(LookAhead(Parser) == TOK_PAREN_OPEN)
504 // TODO: Handle casts here
505 switch(LookAhead(Parser))
507 case TOKEN_GROUP_TYPES:
509 TOKEN_GET_DATATYPE(type, Parser->Token);
510 SyntaxAssert(Parser, GetToken(Parser), TOK_PAREN_CLOSE);
511 ret = AST_NewCast(Parser, type, Parse_DoParen(Parser));
514 ret = Parse_DoExpr0(Parser);
515 SyntaxAssert(Parser, GetToken(Parser), TOK_PAREN_CLOSE);
521 return Parse_DoValue(Parser);
524 // --------------------
525 // Last Expression - Value
526 // --------------------
527 tAST_Node *Parse_DoValue(tParser *Parser)
529 int tok = LookAhead(Parser);
532 printf("Parse_DoValue: tok = %i\n", tok);
537 case TOK_STR: return Parse_GetString(Parser);
538 case TOK_INTEGER: return Parse_GetNumeric(Parser);
539 case TOK_IDENT: return Parse_GetIdent(Parser);
540 case TOK_VARIABLE: return Parse_GetVariable(Parser);
543 fprintf(stderr, "Syntax Error: Unexpected %s on line %i, Expected TOK_T_VALUE\n",
544 csaTOKEN_NAMES[tok], Parser->CurLine);
545 longjmp( Parser->JmpTarget, -1 );
550 * \brief Get a string
552 tAST_Node *Parse_GetString(tParser *Parser)
559 char data[ Parser->TokenLen - 2 ];
562 for( i = 1; i < Parser->TokenLen - 1; i++ )
564 if( Parser->TokenStr[i] == '\\' ) {
566 switch( Parser->TokenStr[i] )
568 case 'n': data[j++] = '\n'; break;
569 case 'r': data[j++] = '\r'; break;
572 // TODO: Error/Warning?
577 data[j++] = Parser->TokenStr[i];
581 // TODO: Parse Escape Codes
582 ret = AST_NewString( Parser, data, j );
588 * \brief Get a numeric value
590 tAST_Node *Parse_GetNumeric(tParser *Parser)
595 pos = Parser->TokenStr;
596 //printf("pos = %p, *pos = %c\n", pos, *pos);
606 if( '0' <= *pos && *pos <= '9' ) {
610 if( 'A' <= *pos && *pos <= 'F' ) {
611 value += *pos - 'A' + 10;
614 if( 'a' <= *pos && *pos <= 'f' ) {
615 value += *pos - 'a' + 10;
622 while( '0' <= *pos && *pos <= '7' ) {
623 value = value*8 + *pos - '0';
629 while( '0' <= *pos && *pos <= '9' ) {
630 value = value*10 + *pos - '0';
635 return AST_NewInteger( Parser, value );
639 * \brief Get a variable
641 tAST_Node *Parse_GetVariable(tParser *Parser)
644 SyntaxAssert( Parser, GetToken(Parser), TOK_VARIABLE );
646 char name[Parser->TokenLen];
647 memcpy(name, Parser->TokenStr+1, Parser->TokenLen-1);
648 name[Parser->TokenLen-1] = 0;
649 ret = AST_NewVariable( Parser, name );
651 printf("Parse_GetVariable: name = '%s'\n", name);
654 // Handle array references
655 while( LookAhead(Parser) == TOK_SQUARE_OPEN )
658 ret = AST_NewBinOp(Parser, NODETYPE_INDEX, ret, Parse_DoExpr0(Parser));
659 SyntaxAssert(Parser, GetToken(Parser), TOK_SQUARE_CLOSE);
665 * \brief Get an identifier (constand or function call)
667 tAST_Node *Parse_GetIdent(tParser *Parser)
671 SyntaxAssert(Parser, GetToken(Parser), TOK_IDENT );
672 name = strndup( Parser->TokenStr, Parser->TokenLen );
675 while( GetToken(Parser) == TOK_SCOPE )
682 if( GetToken(Parser) == TOK_PAREN_OPEN )
685 printf("Parse_GetIdent: Calling '%s'\n", name);
688 ret = AST_NewFunctionCall( Parser, name );
690 if( GetToken(Parser) != TOK_PAREN_CLOSE )
695 printf(" Parse_GetIdent: Argument\n");
697 AST_AppendFunctionCallArg( ret, Parse_DoExpr0(Parser) );
698 } while(GetToken(Parser) == TOK_COMMA);
699 SyntaxAssert( Parser, Parser->Token, TOK_PAREN_CLOSE );
701 printf(" Parse_GetIdent: All arguments parsed\n");
708 printf("Parse_GetIdent: Referencing '%s'\n", name);
711 ret = AST_NewConstant( Parser, name );
719 * \brief Check for an error
721 void SyntaxAssert(tParser *Parser, int Have, int Want)
724 fprintf(stderr, "ERROR: SyntaxAssert Failed, Expected %s(%i), got %s(%i) on line %i\n",
725 csaTOKEN_NAMES[Want], Want, csaTOKEN_NAMES[Have], Have, Parser->CurLine);
726 longjmp(Parser->JmpTarget, -1);