1 #include <msp/strings/format.h>
2 #include <msp/strings/regex.h>
3 #include "programparser.h"
10 using namespace ProgramSyntax;
12 ProgramParser::Operator ProgramParser::operators[] =
14 { "[", 2, BINARY, LEFT_TO_RIGHT },
15 { "(", 2, BINARY, LEFT_TO_RIGHT },
16 { ".", 2, BINARY, LEFT_TO_RIGHT },
17 { "++", 2, POSTFIX, LEFT_TO_RIGHT },
18 { "--", 2, POSTFIX, LEFT_TO_RIGHT },
19 { "++", 3, PREFIX, RIGHT_TO_LEFT },
20 { "--", 3, PREFIX, RIGHT_TO_LEFT },
21 { "+", 3, PREFIX, RIGHT_TO_LEFT },
22 { "-", 3, PREFIX, RIGHT_TO_LEFT },
23 { "~", 3, PREFIX, RIGHT_TO_LEFT },
24 { "!", 3, PREFIX, RIGHT_TO_LEFT },
25 { "*", 4, BINARY, LEFT_TO_RIGHT },
26 { "/", 4, BINARY, LEFT_TO_RIGHT },
27 { "%", 4, BINARY, LEFT_TO_RIGHT },
28 { "+", 5, BINARY, LEFT_TO_RIGHT },
29 { "-", 5, BINARY, LEFT_TO_RIGHT },
30 { "<<", 6, BINARY, LEFT_TO_RIGHT },
31 { ">>", 6, BINARY, LEFT_TO_RIGHT },
32 { "<", 7, BINARY, LEFT_TO_RIGHT },
33 { ">", 7, BINARY, LEFT_TO_RIGHT },
34 { "<=", 7, BINARY, LEFT_TO_RIGHT },
35 { ">=", 7, BINARY, LEFT_TO_RIGHT },
36 { "==", 8, BINARY, LEFT_TO_RIGHT },
37 { "!=", 8, BINARY, LEFT_TO_RIGHT },
38 { "&", 9, BINARY, LEFT_TO_RIGHT },
39 { "^", 10, BINARY, LEFT_TO_RIGHT },
40 { "|", 11, BINARY, LEFT_TO_RIGHT },
41 { "&&", 12, BINARY, LEFT_TO_RIGHT },
42 { "^^", 13, BINARY, LEFT_TO_RIGHT },
43 { "||", 14, BINARY, LEFT_TO_RIGHT },
44 { "?", 15, BINARY, RIGHT_TO_LEFT },
45 { ":", 15, BINARY, RIGHT_TO_LEFT },
46 { "=", 16, BINARY, RIGHT_TO_LEFT },
47 { "+=", 16, BINARY, RIGHT_TO_LEFT },
48 { "-=", 16, BINARY, RIGHT_TO_LEFT },
49 { "*=", 16, BINARY, RIGHT_TO_LEFT },
50 { "/=", 16, BINARY, RIGHT_TO_LEFT },
51 { "%=", 16, BINARY, RIGHT_TO_LEFT },
52 { "<<=", 16, BINARY, RIGHT_TO_LEFT },
53 { ">>=", 16, BINARY, RIGHT_TO_LEFT },
54 { "&=", 16, BINARY, RIGHT_TO_LEFT },
55 { "^=", 16, BINARY, RIGHT_TO_LEFT },
56 { "|=", 16, BINARY, RIGHT_TO_LEFT },
57 { ",", 17, BINARY, LEFT_TO_RIGHT },
58 { { 0 }, 18, NO_OPERATOR, LEFT_TO_RIGHT }
61 ProgramParser::ProgramParser():
65 ProgramParser::~ProgramParser()
70 Module &ProgramParser::parse(const string &s)
77 Module &ProgramParser::parse(IO::Base &io)
83 unsigned len = io.read(buffer, sizeof(buffer));
84 source.append(buffer, len);
90 void ProgramParser::parse_source()
94 cur_stage = &module->shared;
95 iter = source.begin();
98 while(Node *statement = parse_global_declaration())
99 cur_stage->content.body.push_back(statement);
102 string token = parse_token();
105 else if(token=="vertex")
106 module->stages.push_back(VERTEX);
107 else if(token=="geometry")
108 module->stages.push_back(GEOMETRY);
109 else if(token=="fragment")
110 module->stages.push_back(FRAGMENT);
112 throw runtime_error(format("Parse error at '%s': expected stage identifier", token));
114 if(cur_stage->type!=SHARED)
115 module->stages.back().previous = cur_stage;
116 cur_stage = &module->stages.back();
118 for(; (iter!=source.end() && *iter!='\n'); ++iter) ;
122 const string &ProgramParser::peek_token(unsigned index)
124 while(next_tokens.size()<=index)
125 next_tokens.push_back(parse_token_());
126 return next_tokens[index];
129 string ProgramParser::parse_token()
131 if(!next_tokens.empty())
133 string token = next_tokens.front();
134 next_tokens.pop_front();
138 return parse_token_();
141 string ProgramParser::parse_token_()
143 if(!skip_comment_and_whitespace())
146 if(isalpha(*iter) || *iter=='_')
147 return parse_identifier();
148 else if(isdigit(*iter))
149 return parse_number();
151 return parse_other();
154 string ProgramParser::parse_identifier()
157 while(iter!=source.end())
159 if(isalnum(*iter) || *iter=='_')
168 string ProgramParser::parse_number()
170 bool accept_sign = false;
172 while(iter!=source.end())
174 if(isdigit(*iter) || *iter=='.')
176 else if(*iter=='e' || *iter=='E')
181 else if(accept_sign && (*iter=='+' || *iter=='-'))
190 string ProgramParser::parse_other()
192 if(iter==source.end())
195 string token(1, *iter++);
196 for(unsigned i=1; (i<3 && iter!=source.end()); ++i)
198 bool matched = false;
199 for(const Operator *j=operators; (!matched && j->type); ++j)
201 matched = (j->token[i]==*iter);
202 for(unsigned k=0; (matched && k<i && j->token[k]); ++k)
203 matched = (j->token[k]==token[k]);
215 bool ProgramParser::skip_comment_and_whitespace()
217 unsigned comment = 0;
218 unsigned slashes = 0;
219 while(iter!=source.end())
225 else if(!isspace(*iter))
250 else if(!isspace(*iter) && slashes>=6)
253 else if(comment==3 && *iter=='*')
266 return iter!=source.end();
269 void ProgramParser::expect(const string &token)
271 string parsed = parse_token();
273 throw runtime_error(format("Parse error at '%s': expected '%s'", parsed, token));
276 string ProgramParser::expect_type()
278 string token = parse_token();
280 throw runtime_error(format("Parse error at '%s': expected a type", token));
284 string ProgramParser::expect_identifier()
286 string token = parse_token();
287 if(!is_identifier(token))
288 throw runtime_error(format("Parse error at '%s': expected an identifier", token));
292 bool ProgramParser::check(const string &token)
294 bool result = (peek_token()==token);
300 bool ProgramParser::is_interface_qualifier(const string &token)
302 return (token=="uniform" || token=="in" || token=="out");
305 bool ProgramParser::is_sampling_qualifier(const string &token)
307 return token=="centroid";
310 bool ProgramParser::is_qualifier(const string &token)
312 return (token=="const" || is_interface_qualifier(token) || is_sampling_qualifier(token));
315 bool ProgramParser::is_builtin_type(const string &token)
317 static Regex re("^(void|float|int|bool|[ib]?vec[234]|mat[234](x[234])?|sampler((1D|2D)(Array)?(Shadow)?|Cube(Shadow)?|3D))$");
318 return re.match(token);
321 bool ProgramParser::is_type(const string &token)
323 return is_builtin_type(token) || declared_types.count(token);
326 bool ProgramParser::is_identifier(const string &token)
328 static Regex re("^[a-zA-Z_][a-zA-Z0-9_]*$");
329 return re.match(token);
332 Node *ProgramParser::parse_global_declaration()
334 string token = peek_token();
336 return parse_layout();
337 else if(token=="struct")
338 return parse_struct_declaration();
339 else if(is_sampling_qualifier(token) || token=="const")
340 return parse_variable_declaration();
341 else if(is_interface_qualifier(token))
343 if(is_type(peek_token(1)))
344 return parse_variable_declaration();
346 return parse_interface_block();
348 else if(is_type(token))
350 if(peek_token(2)=="(")
351 return parse_function_declaration();
353 return parse_variable_declaration();
355 else if(token.empty())
358 throw runtime_error(format("Syntax error at '%s': expected a global declaration", token));
361 Node *ProgramParser::parse_statement()
363 string token = peek_token();
365 return parse_conditional();
366 else if(token=="for")
367 return parse_iteration();
368 else if(token=="passthrough")
369 return parse_passthrough();
370 else if(token=="return")
371 return parse_return();
372 else if(is_qualifier(token) || is_type(token))
373 return parse_variable_declaration();
374 else if(!token.empty())
376 RefPtr<ExpressionStatement> expr = new ExpressionStatement;
377 expr->expression = parse_expression();
380 return expr.release();
383 throw runtime_error(format("Syntax error at '%s': expected a statement", token));
386 Layout *ProgramParser::parse_layout()
390 RefPtr<Layout> layout = new Layout;
393 string token = parse_token();
395 throw runtime_error(format("Parse error at '%s': expected layout qualifier id", token));
397 layout->qualifiers.push_back(Layout::Qualifier());
398 Layout::Qualifier &qual = layout->qualifiers.back();
399 qual.identifier = token;
402 qual.value = parse_token();
404 if(peek_token()==")")
410 layout->interface = parse_token();
413 return layout.release();
416 void ProgramParser::parse_block(Block &block, bool require_braces)
418 bool have_braces = (require_braces || peek_token()=="{");
424 while(peek_token()!="}")
425 block.body.push_back(parse_statement());
428 block.body.push_back(parse_statement());
430 block.use_braces = (require_braces || block.body.size()!=1);
436 Expression *ProgramParser::parse_expression(unsigned precedence)
438 RefPtr<Expression> left;
439 VariableReference *left_var = 0;
442 string token = peek_token();
444 const Operator *oper = 0;
445 for(Operator *i=operators; (!oper && i->type); ++i)
446 if(token==i->token && (!left || i->type!=PREFIX) && (left || i->type!=POSTFIX))
449 if(token==";" || token==")" || token=="]" || token=="," || (oper && precedence && oper->precedence>=precedence))
452 return left.release();
454 throw runtime_error(format("Parse error at '%s': expected an expression", token));
461 throw runtime_error(format("Parse error at '%s': function name must be an identifier", token));
462 left = parse_function_call(left_var);
466 RefPtr<MemberAccess> memacc = new MemberAccess;
467 memacc->left = left.release();
469 memacc->member = expect_identifier();
472 else if(oper && oper->type==POSTFIX)
474 RefPtr<UnaryExpression> unary = new UnaryExpression;
475 unary->oper = parse_token();
476 unary->prefix = false;
477 unary->expression = left.release();
480 else if(oper && oper->type==BINARY)
481 left = parse_binary(left.release(), oper);
483 throw runtime_error(format("Parse error at '%s': expected an operator", token));
491 RefPtr<ParenthesizedExpression> parexpr = new ParenthesizedExpression;
492 parexpr->expression = parse_expression();
496 else if(is_identifier(token))
498 RefPtr<VariableReference> var = new VariableReference;
499 var->name = expect_identifier();
501 left_var = var.get();
503 else if(oper && oper->type==PREFIX)
505 RefPtr<UnaryExpression> unary = new UnaryExpression;
506 unary->oper = parse_token();
507 unary->prefix = true;
508 unary->expression = parse_expression(oper->precedence);
511 else if(isdigit(token[0]))
513 RefPtr<Literal> literal = new Literal;
514 literal->token = parse_token();
518 throw runtime_error(format("Parse error at '%s': expected an expression", token));
523 BinaryExpression *ProgramParser::parse_binary(Expression *left, const Operator *oper)
525 RefPtr<BinaryExpression> binary = (oper->precedence==16 ? new Assignment : new BinaryExpression);
527 binary->oper = parse_token();
528 if(binary->oper=="[")
530 binary->right = parse_expression();
535 binary->right = parse_expression(oper->precedence+(oper->assoc==RIGHT_TO_LEFT));
536 return binary.release();
539 FunctionCall *ProgramParser::parse_function_call(VariableReference *var)
541 RefPtr<FunctionCall> call = new FunctionCall;
542 call->name = var->name;
543 call->constructor = is_type(call->name);
545 while(peek_token()!=")")
547 if(!call->arguments.empty())
549 call->arguments.push_back(parse_expression());
552 return call.release();
555 StructDeclaration *ProgramParser::parse_struct_declaration()
558 RefPtr<StructDeclaration> strct = new StructDeclaration;
560 strct->name = expect_identifier();
561 parse_block(strct->members, true);
564 declared_types.insert(strct->name);
565 return strct.release();
568 VariableDeclaration *ProgramParser::parse_variable_declaration()
570 RefPtr<VariableDeclaration> var = new VariableDeclaration;
572 string token = peek_token();
573 if(is_sampling_qualifier(token))
575 var->sampling = parse_token();
576 token = peek_token();
577 if(!is_interface_qualifier(token))
578 throw runtime_error(format("Parse error at '%s': expected an interface qualifier", token));
581 if(is_interface_qualifier(token))
582 var->interface = parse_token();
583 else if(token=="const")
585 var->constant = true;
589 var->type = expect_type();
590 var->name = expect_identifier();
597 var->array_size = parse_expression();
603 var->init_expression = parse_expression();
606 return var.release();
609 FunctionDeclaration *ProgramParser::parse_function_declaration()
611 RefPtr<FunctionDeclaration> func = new FunctionDeclaration;
613 func->return_type = expect_type();
614 func->name = expect_identifier();
616 while(peek_token()!=")")
618 if(!func->parameters.empty())
621 RefPtr<VariableDeclaration> var = new VariableDeclaration;
622 var->type = expect_type();
623 var->name = expect_identifier();
624 func->parameters.push_back(var.release());
628 string token = peek_token();
631 func->definition = true;
632 parse_block(func->body, true);
637 throw runtime_error(format("Parse error at '%s': expected '{' or ';'", token));
639 return func.release();
642 InterfaceBlock *ProgramParser::parse_interface_block()
644 RefPtr<InterfaceBlock> iface = new InterfaceBlock;
646 iface->interface = parse_token();
647 if(!is_interface_qualifier(iface->interface))
648 throw runtime_error(format("Parse error at '%s': expected an interface qualifier", iface->interface));
650 iface->name = expect_identifier();
651 parse_block(iface->members, true);
654 iface->instance_name = expect_identifier();
663 return iface.release();
666 Conditional *ProgramParser::parse_conditional()
670 RefPtr<Conditional> cond = new Conditional;
671 cond->condition = parse_expression();
674 parse_block(cond->body, false);
676 string token = peek_token();
680 parse_block(cond->else_body, false);
683 return cond.release();
686 Iteration *ProgramParser::parse_iteration()
690 RefPtr<Iteration> loop = new Iteration;
691 string token = peek_token();
693 loop->init_statement = parse_statement();
696 RefPtr<ExpressionStatement> expr = new ExpressionStatement;
697 expr->expression = parse_expression();
699 loop->init_statement = expr.release();
701 loop->condition = parse_expression();
703 loop->loop_expression = parse_expression();
706 parse_block(loop->body, false);
708 return loop.release();
711 Passthrough *ProgramParser::parse_passthrough()
713 expect("passthrough");
714 RefPtr<Passthrough> pass = new Passthrough;
715 if(cur_stage->type==GEOMETRY)
718 pass->subscript = parse_expression();
722 return pass.release();
725 Return *ProgramParser::parse_return()
728 RefPtr<Return> ret = new Return;
729 if(peek_token()!=";")
730 ret->expression = parse_expression();
732 return ret.release();