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);
41 * \brief Parse a buffer into a syntax tree
43 tAST_Script *Parse_Buffer(tSpiderVariant *Variant, char *Buffer)
46 tParser *Parser = &parser; //< Keeps code consitent
54 printf("Parse_Buffer: (Variant=%p, Buffer=%p)\n", Variant, Buffer);
58 parser.LastToken = -1;
59 parser.NextToken = -1;
61 parser.BufStart = Buffer;
62 parser.CurPos = Buffer;
64 ret = AST_NewScript();
65 mainCode = AST_NewCodeBlock();
67 if( setjmp( parser.JmpTarget ) != 0 )
69 AST_FreeNode( mainCode );
73 while(Parser->Token != TOK_EOF)
75 switch( GetToken(Parser) )
80 // Typed variables/functions
81 case TOKEN_GROUP_TYPES:
84 TOKEN_GET_DATATYPE(type, Parser->Token);
86 tok = GetToken(Parser);
87 // Define a function (pass on to the other function definition code)
88 if( tok == TOK_IDENT ) {
92 else if( tok == TOK_VARIABLE ) {
93 AST_AppendNode( mainCode, Parse_GetVarDef(Parser, type) );
94 SyntaxAssert(Parser, GetToken(Parser), TOK_SEMICOLON);
97 fprintf(stderr, "ERROR: Unexpected %s, expected TOK_IDENT or TOK_VARIABLE\n",
104 case TOK_RWD_FUNCTION:
105 if( !Variant->bDyamicTyped ) {
106 fprintf(stderr, "ERROR: Attempt to create a dynamic function\n");
107 longjmp(Parser->JmpTarget, -1);
109 type = SS_DATATYPE_DYNAMIC;
110 SyntaxAssert(Parser, GetToken(Parser), TOK_IDENT );
112 name = strndup( Parser->TokenStr, Parser->TokenLen );
113 fcn = AST_AppendFunction( ret, name );
115 printf("DefFCN %s\n", name);
120 SyntaxAssert(Parser, GetToken(Parser), TOK_PAREN_OPEN );
121 if( LookAhead(Parser) != TOK_PAREN_CLOSE )
124 type = SS_DATATYPE_DYNAMIC;
126 // Non dynamic typed variants must use data types
127 if( !Variant->bDyamicTyped ) {
128 TOKEN_GET_DATATYPE(type, Parser->Token);
131 AST_AppendFunctionArg(fcn, Parse_GetVarDef(Parser, type));
132 } while(GetToken(Parser) == TOK_COMMA);
136 SyntaxAssert(Parser, Parser->Token, TOK_PAREN_CLOSE );
138 AST_SetFunctionCode( fcn, Parse_DoCodeBlock(Parser) );
143 AST_AppendNode( mainCode, Parse_DoBlockLine(Parser) );
148 fcn = AST_AppendFunction( ret, "" );
149 AST_SetFunctionCode( fcn, mainCode );
151 printf("---- %p parsed as SpiderScript ----\n", Buffer);
157 * \brief Parse a block of code surrounded by { }
159 tAST_Node *Parse_DoCodeBlock(tParser *Parser)
162 SyntaxAssert(Parser, GetToken(Parser), TOK_BRACE_OPEN );
164 ret = AST_NewCodeBlock();
166 while( LookAhead(Parser) != TOK_BRACE_CLOSE )
168 AST_AppendNode( ret, Parse_DoBlockLine(Parser) );
170 GetToken(Parser); // Omnomnom
175 * \brief Parse a line in a block
177 tAST_Node *Parse_DoBlockLine(tParser *Parser)
181 //printf("Parse_DoBlockLine: Line %i\n", Parser->CurLine);
183 switch(LookAhead(Parser))
186 // Return from a method
188 //printf("return\n");
190 ret = AST_NewUniOp(NODETYPE_RETURN, Parse_DoExpr0(Parser));
197 case TOK_RWD_INTEGER:
201 switch(GetToken(Parser))
203 case TOK_RWD_INTEGER: type = SS_DATATYPE_INTEGER; break;
204 case TOK_RWD_OBJECT: type = SS_DATATYPE_OBJECT; break;
205 case TOK_RWD_REAL: type = SS_DATATYPE_REAL; break;
206 case TOK_RWD_STRING: type = SS_DATATYPE_STRING; break;
209 SyntaxAssert(Parser, GetToken(Parser), TOK_VARIABLE);
211 ret = Parse_GetVarDef(Parser, type);
218 ret = Parse_DoExpr0(Parser);
222 SyntaxAssert(Parser, GetToken(Parser), TOK_SEMICOLON );
227 * \brief Get a variable definition
229 tAST_Node *Parse_GetVarDef(tParser *Parser, int Type)
231 char name[Parser->TokenLen];
234 SyntaxAssert(Parser, Parser->Token, TOK_VARIABLE);
236 // copy the name (trimming the $)
237 memcpy(name, Parser->TokenStr+1, Parser->TokenLen-1);
238 name[Parser->TokenLen-1] = 0;
239 // Define the variable
240 ret = AST_NewDefineVar(Type, name);
242 while( LookAhead(Parser) == TOK_SQUARE_OPEN )
245 AST_AppendNode(ret, Parse_DoExpr0(Parser));
246 SyntaxAssert(Parser, GetToken(Parser), TOK_SQUARE_CLOSE);
252 * \brief Assignment Operations
254 tAST_Node *Parse_DoExpr0(tParser *Parser)
256 tAST_Node *ret = Parse_DoExpr1(Parser);
259 switch(LookAhead(Parser))
262 GetToken(Parser); // Eat Token
263 ret = AST_NewAssign(NODETYPE_NOP, ret, Parse_DoExpr0(Parser));
267 GetToken(Parser); // Eat Token
268 ret = AST_NewAssign(NODETYPE_DIVIDE, ret, Parse_DoExpr0(Parser));
271 GetToken(Parser); // Eat Token
272 ret = AST_NewAssign(NODETYPE_MULTIPLY, ret, Parse_DoExpr0(Parser));
277 printf("Parse_DoExpr0: Parser->Token = %i\n", Parser->Token);
285 * \brief Logical/Boolean Operators
287 tAST_Node *Parse_DoExpr1(tParser *Parser)
289 tAST_Node *ret = Parse_DoExpr2(Parser);
291 switch(GetToken(Parser))
294 ret = AST_NewBinOp(NODETYPE_LOGICALAND, ret, Parse_DoExpr1(Parser));
297 ret = AST_NewBinOp(NODETYPE_LOGICALOR, ret, Parse_DoExpr1(Parser));
300 ret = AST_NewBinOp(NODETYPE_LOGICALXOR, ret, Parse_DoExpr1(Parser));
309 // --------------------
310 // Expression 2 - Comparison Operators
311 // --------------------
312 tAST_Node *Parse_DoExpr2(tParser *Parser)
314 tAST_Node *ret = Parse_DoExpr3(Parser);
317 switch(GetToken(Parser))
320 ret = AST_NewBinOp(NODETYPE_EQUALS, ret, Parse_DoExpr2(Parser));
323 ret = AST_NewBinOp(NODETYPE_LESSTHAN, ret, Parse_DoExpr2(Parser));
326 ret = AST_NewBinOp(NODETYPE_GREATERTHAN, ret, Parse_DoExpr2(Parser));
336 * \brief Bitwise Operations
338 tAST_Node *Parse_DoExpr3(tParser *Parser)
340 tAST_Node *ret = Parse_DoExpr4(Parser);
343 switch(GetToken(Parser))
346 ret = AST_NewBinOp(NODETYPE_BWOR, ret, Parse_DoExpr3(Parser));
349 ret = AST_NewBinOp(NODETYPE_BWAND, ret, Parse_DoExpr3(Parser));
352 ret = AST_NewBinOp(NODETYPE_BWXOR, ret, Parse_DoExpr3(Parser));
361 // --------------------
362 // Expression 4 - Shifts
363 // --------------------
364 tAST_Node *Parse_DoExpr4(tParser *Parser)
366 tAST_Node *ret = Parse_DoExpr5(Parser);
368 switch(GetToken(Parser))
371 ret = AST_NewBinOp(NODETYPE_BITSHIFTLEFT, ret, Parse_DoExpr5(Parser));
374 ret = AST_NewBinOp(NODETYPE_BITSHIFTRIGHT, ret, Parse_DoExpr5(Parser));
384 // --------------------
385 // Expression 5 - Arithmatic
386 // --------------------
387 tAST_Node *Parse_DoExpr5(tParser *Parser)
389 tAST_Node *ret = Parse_DoExpr6(Parser);
391 switch(GetToken(Parser))
394 ret = AST_NewBinOp(NODETYPE_ADD, ret, Parse_DoExpr5(Parser));
397 ret = AST_NewBinOp(NODETYPE_SUBTRACT, ret, Parse_DoExpr5(Parser));
407 // --------------------
408 // Expression 6 - Multiplcation & Division
409 // --------------------
410 tAST_Node *Parse_DoExpr6(tParser *Parser)
412 tAST_Node *ret = Parse_DoParen(Parser);
414 switch(GetToken(Parser))
417 ret = AST_NewBinOp(NODETYPE_MULTIPLY, ret, Parse_DoExpr6(Parser));
420 ret = AST_NewBinOp(NODETYPE_DIVIDE, ret, Parse_DoExpr6(Parser));
431 // --------------------
432 // 2nd Last Expression - Parens
433 // --------------------
434 tAST_Node *Parse_DoParen(tParser *Parser)
437 printf("Parse_DoParen: (Parser=%p)\n", Parser);
439 if(LookAhead(Parser) == TOK_PAREN_OPEN)
444 // TODO: Handle casts here
446 ret = Parse_DoExpr0(Parser);
447 SyntaxAssert(Parser, GetToken(Parser), TOK_PAREN_CLOSE);
451 return Parse_DoValue(Parser);
454 // --------------------
455 // Last Expression - Value
456 // --------------------
457 tAST_Node *Parse_DoValue(tParser *Parser)
459 int tok = LookAhead(Parser);
462 printf("Parse_DoValue: tok = %i\n", tok);
467 case TOK_STR: return Parse_GetString(Parser);
468 case TOK_INTEGER: return Parse_GetNumeric(Parser);
469 case TOK_IDENT: return Parse_GetIdent(Parser);
470 case TOK_VARIABLE: return Parse_GetVariable(Parser);
473 fprintf(stderr, "Syntax Error: Unexpected %s on line %i, Expected TOK_T_VALUE\n",
474 csaTOKEN_NAMES[tok], Parser->CurLine);
475 longjmp( Parser->JmpTarget, -1 );
480 * \brief Get a string
482 tAST_Node *Parse_GetString(tParser *Parser)
486 // TODO: Parse Escape Codes
487 ret = AST_NewString( Parser->TokenStr+1, Parser->TokenLen-2 );
492 * \brief Get a numeric value
494 tAST_Node *Parse_GetNumeric(tParser *Parser)
498 value = atoi( Parser->TokenStr );
499 return AST_NewInteger( value );
503 * \brief Get a variable
505 tAST_Node *Parse_GetVariable(tParser *Parser)
508 SyntaxAssert( Parser, GetToken(Parser), TOK_VARIABLE );
510 char name[Parser->TokenLen];
511 memcpy(name, Parser->TokenStr+1, Parser->TokenLen-1);
512 name[Parser->TokenLen-1] = 0;
513 ret = AST_NewVariable( name );
515 printf("Parse_GetVariable: name = '%s'\n", name);
518 // Handle array references
519 while( LookAhead(Parser) == TOK_SQUARE_OPEN )
522 ret = AST_NewBinOp(NODETYPE_INDEX, ret, Parse_DoExpr0(Parser));
523 SyntaxAssert(Parser, GetToken(Parser), TOK_SQUARE_CLOSE);
529 * \brief Get an identifier (constand or function call)
531 tAST_Node *Parse_GetIdent(tParser *Parser)
535 SyntaxAssert(Parser, GetToken(Parser), TOK_IDENT );
536 name = strndup( Parser->TokenStr, Parser->TokenLen );
539 while( GetToken(Parser) == TOK_SCOPE )
546 if( GetToken(Parser) == TOK_PAREN_OPEN )
549 printf("Parse_GetIdent: Calling '%s'\n", name);
552 ret = AST_NewFunctionCall( name );
554 if( GetToken(Parser) != TOK_PAREN_CLOSE )
559 printf(" Parse_GetIdent: Argument\n");
561 AST_AppendFunctionCallArg( ret, Parse_DoExpr0(Parser) );
562 } while(GetToken(Parser) == TOK_COMMA);
563 SyntaxAssert( Parser, Parser->Token, TOK_PAREN_CLOSE );
565 printf(" Parse_GetIdent: All arguments parsed\n");
572 printf("Parse_GetIdent: Referencing '%s'\n", name);
575 ret = AST_NewConstant( name );
583 * \brief Check for an error
585 void SyntaxAssert(tParser *Parser, int Have, int Want)
588 fprintf(stderr, "ERROR: SyntaxAssert Failed, Expected %s(%i), got %s(%i) on line %i\n",
589 csaTOKEN_NAMES[Want], Want, csaTOKEN_NAMES[Have], Have, Parser->CurLine);
590 longjmp(Parser->JmpTarget, -1);