prog8/parser/antlr/prog8.g4

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/*
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Prog8 combined lexer and parser grammar
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NOTES:
- whitespace is ignored. (tabs/spaces)
- every position can be empty, be a comment, or contain ONE statement.
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*/
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grammar prog8;
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@header {
package prog8.parser;
}
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LINECOMMENT : [\r\n][ \t]* COMMENT -> channel(HIDDEN);
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COMMENT : ';' ~[\r\n]* -> channel(HIDDEN) ;
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WS : [ \t] -> skip ;
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EOL : [\r\n]+ ;
// WS2 : '\\' EOL -> skip;
VOID: 'void';
NAME : [a-zA-Z][a-zA-Z0-9_]* ;
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DEC_INTEGER : ('0'..'9') | (('1'..'9')('0'..'9')+);
HEX_INTEGER : '$' (('a'..'f') | ('A'..'F') | ('0'..'9'))+ ;
BIN_INTEGER : '%' ('0' | '1')+ ;
ADDRESS_OF: '&';
ALT_STRING_ENCODING: '@';
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FLOAT_NUMBER : FNUMBER (('E'|'e') ('+' | '-')? FNUMBER)? ; // sign comes later from unary expression
fragment FNUMBER : ('0' .. '9') + ('.' ('0' .. '9') +)? ;
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fragment STRING_ESCAPE_SEQ : '\\' . | '\\' EOL;
STRING :
'"' ( STRING_ESCAPE_SEQ | ~[\\\r\n\f"] )* '"'
{
// get rid of the enclosing quotes
String s = getText();
setText(s.substring(1, s.length() - 1));
}
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;
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INLINEASMBLOCK :
'{{' .+? '}}'
{
// get rid of the enclosing double braces
String s = getText();
setText(s.substring(2, s.length() - 2));
}
;
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SINGLECHAR :
'\'' ( STRING_ESCAPE_SEQ | ~[\\\r\n\f"] ) '\''
{
// get rid of the enclosing quotes
String s = getText();
setText(s.substring(1, s.length() - 1));
}
;
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ZEROPAGE :
'@zp'
;
ARRAYSIG :
'[]'
;
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module : (directive | block | EOL)* EOF ;
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block: identifier integerliteral? '{' EOL (block_statement | EOL) * '}' EOL ;
block_statement:
directive
| variabledeclaration
| subroutinedeclaration
| inlineasm
;
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statement :
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directive
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| variabledeclaration
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| assignment
| augassignment
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| unconditionaljump
| postincrdecr
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| functioncall_stmt
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| if_stmt
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| branch_stmt
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| subroutinedeclaration
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| inlineasm
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| returnstmt
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| forloop
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| whileloop
| untilloop
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| repeatloop
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| whenstmt
| breakstmt
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| labeldef
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;
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variabledeclaration :
varinitializer
| structvarinitializer
| vardecl
| structvardecl
| constdecl
| memoryvardecl
| structdecl
;
subroutinedeclaration :
subroutine
| asmsubroutine
| romsubroutine
;
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labeldef : identifier ':' ;
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unconditionaljump : 'goto' (integerliteral | scoped_identifier) ;
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directive :
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directivename=('%output' | '%launcher' | '%zeropage' | '%zpreserved' | '%address' | '%import' |
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'%breakpoint' | '%asminclude' | '%asmbinary' | '%option' | '%target' )
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(directivearg? | directivearg (',' directivearg)*)
;
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directivearg : stringliteral | identifier | integerliteral ;
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vardecl: datatype ZEROPAGE? (arrayindex | ARRAYSIG) ? varname=identifier ;
structvardecl: structname=identifier varname=identifier ;
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varinitializer : vardecl '=' expression ;
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structvarinitializer : structvardecl '=' expression ;
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constdecl: 'const' varinitializer ;
memoryvardecl: ADDRESS_OF varinitializer;
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structdecl: 'struct' identifier '{' EOL vardecl ( EOL vardecl)* EOL? '}' EOL;
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datatype: 'ubyte' | 'byte' | 'uword' | 'word' | 'float' | 'str' ;
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arrayindex: '[' expression ']' ;
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assignment : assign_target '=' expression ;
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augassignment :
assign_target operator=('+=' | '-=' | '/=' | '*=' | '**=' | '&=' | '|=' | '^=' | '%=' | '<<=' | '>>=' ) expression
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;
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assign_target:
scoped_identifier
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| arrayindexed
| directmemory
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;
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postincrdecr : assign_target operator = ('++' | '--') ;
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expression :
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functioncall
| <assoc=right> prefix = ('+'|'-'|'~') expression
| left = expression EOL? bop = '**' EOL? right = expression
| left = expression EOL? bop = ('*' | '/' | '%' ) EOL? right = expression
| left = expression EOL? bop = ('+' | '-' ) EOL? right = expression
| left = expression EOL? bop = ('<<' | '>>' ) EOL? right = expression
| left = expression EOL? bop = ('<' | '>' | '<=' | '>=') EOL? right = expression
| left = expression EOL? bop = '&' EOL? right = expression
| left = expression EOL? bop = '^' EOL? right = expression
| left = expression EOL? bop = '|' EOL? right = expression
| left = expression EOL? bop = ('==' | '!=') EOL? right = expression
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| rangefrom = expression rto = ('to'|'downto') rangeto = expression ('step' rangestep = expression)? // can't create separate rule due to mutual left-recursion
| left = expression EOL? bop = 'and' EOL? right = expression
| left = expression EOL? bop = 'or' EOL? right = expression
| left = expression EOL? bop = 'xor' EOL? right = expression
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| prefix = 'not' expression
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| literalvalue
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| scoped_identifier
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| arrayindexed
| directmemory
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| addressof
| expression typecast
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| '(' expression ')'
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;
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typecast : 'as' datatype;
arrayindexed : scoped_identifier arrayindex ;
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directmemory : '@' '(' expression ')';
addressof : <assoc=right> ADDRESS_OF scoped_identifier ;
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functioncall : scoped_identifier '(' expression_list? ')' ;
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functioncall_stmt : VOID? scoped_identifier '(' expression_list? ')' ;
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expression_list :
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expression (',' EOL? expression)* // you can split the expression list over several lines
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;
returnstmt : 'return' expression? ;
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breakstmt : 'break';
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identifier : NAME ;
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scoped_identifier : NAME ('.' NAME)* ;
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integerliteral : intpart=(DEC_INTEGER | HEX_INTEGER | BIN_INTEGER) ;
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booleanliteral : 'true' | 'false' ;
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arrayliteral : '[' EOL? expression (',' EOL? expression)* EOL? ']' ; // you can split the values over several lines
stringliteral : ALT_STRING_ENCODING? STRING ;
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charliteral : ALT_STRING_ENCODING? SINGLECHAR ;
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floatliteral : FLOAT_NUMBER ;
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literalvalue :
integerliteral
| booleanliteral
| arrayliteral
| stringliteral
| charliteral
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| floatliteral
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;
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inlineasm : '%asm' INLINEASMBLOCK;
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subroutine :
'sub' identifier '(' sub_params? ')' sub_return_part? (statement_block EOL)
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;
sub_return_part : '->' sub_returns ;
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statement_block :
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'{' EOL
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(statement | EOL) *
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'}'
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;
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sub_params : vardecl (',' EOL? vardecl)* ;
sub_returns : datatype (',' EOL? datatype)* ;
asmsubroutine :
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'asmsub' asmsub_decl statement_block
;
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romsubroutine :
'romsub' integerliteral '=' asmsub_decl
;
asmsub_decl : identifier '(' asmsub_params? ')' asmsub_clobbers? asmsub_returns? ;
asmsub_params : asmsub_param (',' EOL? asmsub_param)* ;
asmsub_param : vardecl '@' identifier ; // A,X,Y,AX,AY,XY,Pc,Pz,Pn,Pv allowed.
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asmsub_clobbers : 'clobbers' '(' clobber? ')' ;
clobber : identifier (',' identifier)* ; // A,X,Y allowed
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asmsub_returns : '->' asmsub_return (',' EOL? asmsub_return)* ;
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asmsub_return : datatype '@' identifier ; // A,X,Y,AX,AY,XY,Pc,Pz,Pn,Pv allowed
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if_stmt : 'if' expression EOL? (statement | statement_block) EOL? else_part? ; // statement is constrained later
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else_part : 'else' EOL? (statement | statement_block) ; // statement is constrained later
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branch_stmt : branchcondition EOL? (statement | statement_block) EOL? else_part? EOL ;
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branchcondition: 'if_cs' | 'if_cc' | 'if_eq' | 'if_z' | 'if_ne' | 'if_nz' | 'if_pl' | 'if_pos' | 'if_mi' | 'if_neg' | 'if_vs' | 'if_vc' ;
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forloop : 'for' identifier 'in' expression EOL? (statement | statement_block) ;
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whileloop: 'while' expression EOL? (statement | statement_block) ;
untilloop: 'do' (statement | statement_block) EOL? 'until' expression ;
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repeatloop: 'repeat' expression? EOL? (statement | statement_block) ;
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whenstmt: 'when' expression '{' EOL (when_choice | EOL) * '}' EOL? ;
when_choice: (expression_list | 'else' ) '->' (statement | statement_block ) ;
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