prog8/parser/antlr/prog8.g4
2021-06-18 21:55:03 +02:00

311 lines
7.7 KiB
ANTLR

/*
Prog8 combined lexer and parser grammar
NOTES:
- whitespace is ignored. (tabs/spaces)
- every position can be empty, be a comment, or contain ONE statement.
*/
grammar prog8;
@header {
package prog8.parser;
}
LINECOMMENT : ('\r'? '\n' | '\r') [ \t]* COMMENT -> channel(HIDDEN);
COMMENT : ';' ~[\r\n]* -> channel(HIDDEN) ;
EOL : ('\r'? '\n' | '\r')+ ;
WS : [ \t] -> skip ;
// WS2 : '\\' EOL -> skip;
VOID: 'void';
NAME : [a-zA-Z][a-zA-Z0-9_]* ;
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: '@';
FLOAT_NUMBER : FNUMBER (('E'|'e') ('+' | '-')? FNUMBER)? ; // sign comes later from unary expression
fragment FNUMBER : ('0' .. '9') + ('.' ('0' .. '9') +)? ;
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));
}
;
INLINEASMBLOCK :
'{{' .+? '}}'
{
// get rid of the enclosing double braces
String s = getText();
setText(s.substring(2, s.length() - 2));
}
;
SINGLECHAR :
'\'' ( STRING_ESCAPE_SEQ | ~[\\\r\n\f"] ) '\''
{
// get rid of the enclosing quotes
String s = getText();
setText(s.substring(1, s.length() - 1));
}
;
ZEROPAGE :
'@zp'
;
SHARED :
'@shared'
;
ARRAYSIG :
'[]'
;
cpuregister: 'A' | 'X' | 'Y';
register: 'A' | 'X' | 'Y' | 'AX' | 'AY' | 'XY' | 'Pc' | 'Pz' | 'Pn' | 'Pv' | 'R0' | 'R1' | 'R2' | 'R3' | 'R4' | 'R5' | 'R6' | 'R7' | 'R8' | 'R9' | 'R10' | 'R11' | 'R12' | 'R13' | 'R14' | 'R15';
// A module (file) consists of zero or more directives or blocks, in any order.
// If there are more than one, then they must be separated by EOL (one or more newlines).
// However, trailing EOL is NOT required.
// Note: the parser may see *several* consecutive EOLs - this happens when EOL and comments are interleaved (see #47)
module: EOL* ((directive | block) (EOL+ (directive | block))*)? EOL* EOF;
block: identifier integerliteral? '{' EOL (block_statement | EOL)* '}';
block_statement:
directive
| variabledeclaration
| subroutinedeclaration
| inlineasm
| labeldef
;
statement :
directive
| variabledeclaration
| assignment
| augassignment
| unconditionaljump
| postincrdecr
| functioncall_stmt
| if_stmt
| branch_stmt
| subroutinedeclaration
| inlineasm
| returnstmt
| forloop
| whileloop
| untilloop
| repeatloop
| whenstmt
| breakstmt
| labeldef
;
variabledeclaration :
varinitializer
| vardecl
| constdecl
| memoryvardecl
;
subroutinedeclaration :
subroutine
| asmsubroutine
| romsubroutine
;
labeldef : identifier ':' ;
unconditionaljump : 'goto' (integerliteral | scoped_identifier) ;
directive :
directivename=('%output' | '%launcher' | '%zeropage' | '%zpreserved' | '%address' | '%import' |
'%breakpoint' | '%asminclude' | '%asmbinary' | '%option' | '%target' )
(directivearg? | directivearg (',' directivearg)*)
;
directivearg : stringliteral | identifier | integerliteral ;
vardecl: datatype SHARED? ZEROPAGE? (arrayindex | ARRAYSIG) ? varname=identifier ;
varinitializer : vardecl '=' expression ;
constdecl: 'const' varinitializer ;
memoryvardecl: ADDRESS_OF varinitializer;
datatype: 'ubyte' | 'byte' | 'uword' | 'word' | 'float' | 'str' ;
arrayindex: '[' expression ']' ;
assignment : assign_target '=' expression ;
augassignment :
assign_target operator=('+=' | '-=' | '/=' | '*=' | '**=' | '&=' | '|=' | '^=' | '%=' | '<<=' | '>>=' ) expression
;
assign_target:
scoped_identifier
| arrayindexed
| directmemory
;
postincrdecr : assign_target operator = ('++' | '--') ;
expression :
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
| 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
| prefix = 'not' expression
| literalvalue
| scoped_identifier
| arrayindexed
| directmemory
| addressof
| expression typecast
| '(' expression ')'
;
typecast : 'as' datatype;
arrayindexed : scoped_identifier arrayindex ;
directmemory : '@' '(' expression ')';
addressof : <assoc=right> ADDRESS_OF scoped_identifier ;
functioncall : scoped_identifier '(' expression_list? ')' ;
functioncall_stmt : VOID? scoped_identifier '(' expression_list? ')' ;
expression_list :
expression (',' EOL? expression)* // you can split the expression list over several lines
;
returnstmt : 'return' expression? ;
breakstmt : 'break';
identifier : NAME ;
scoped_identifier : NAME ('.' NAME)* ;
integerliteral : intpart=(DEC_INTEGER | HEX_INTEGER | BIN_INTEGER) ;
booleanliteral : 'true' | 'false' ;
arrayliteral : '[' EOL? expression (',' EOL? expression)* EOL? ']' ; // you can split the values over several lines
stringliteral : ALT_STRING_ENCODING? STRING ;
charliteral : ALT_STRING_ENCODING? SINGLECHAR ;
floatliteral : FLOAT_NUMBER ;
literalvalue :
integerliteral
| booleanliteral
| arrayliteral
| stringliteral
| charliteral
| floatliteral
;
inlineasm : '%asm' INLINEASMBLOCK;
inline: 'inline';
subroutine :
inline? 'sub' identifier '(' sub_params? ')' sub_return_part? (statement_block EOL)
;
sub_return_part : '->' sub_returns ;
statement_block :
'{' EOL
(statement | EOL) *
'}'
;
sub_params : vardecl (',' EOL? vardecl)* ;
sub_returns : datatype (',' EOL? datatype)* ;
asmsubroutine :
inline? 'asmsub' asmsub_decl statement_block
;
romsubroutine :
'romsub' integerliteral '=' asmsub_decl
;
asmsub_decl : identifier '(' asmsub_params? ')' asmsub_clobbers? asmsub_returns? ;
asmsub_params : asmsub_param (',' EOL? asmsub_param)* ;
asmsub_param : vardecl '@' register ; // A,X,Y,AX,AY,XY,Pc,Pz,Pn,Pv allowed.
asmsub_clobbers : 'clobbers' '(' clobber? ')' ;
clobber : cpuregister (',' cpuregister)* ; // A,X,Y allowed
asmsub_returns : '->' asmsub_return (',' EOL? asmsub_return)* ;
asmsub_return : datatype '@' register ; // A,X,Y,AX,AY,XY,Pc,Pz,Pn,Pv allowed
if_stmt : 'if' expression EOL? (statement | statement_block) EOL? else_part? ; // statement is constrained later
else_part : 'else' EOL? (statement | statement_block) ; // statement is constrained later
branch_stmt : branchcondition EOL? (statement | statement_block) EOL? else_part? EOL ;
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' ;
forloop : 'for' identifier 'in' expression EOL? (statement | statement_block) ;
whileloop: 'while' expression EOL? (statement | statement_block) ;
untilloop: 'do' (statement | statement_block) EOL? 'until' expression ;
repeatloop: 'repeat' expression? EOL? (statement | statement_block) ;
whenstmt: 'when' expression '{' EOL (when_choice | EOL) * '}' EOL? ;
when_choice: (expression_list | 'else' ) '->' (statement | statement_block ) ;