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116 lines
2.6 KiB
ANTLR
116 lines
2.6 KiB
ANTLR
/*
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IL65 lexer and parser grammar
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*/
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grammar il65;
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COMMENT : ';' ~[\r\n]* -> channel(1) ;
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WS : [ \t] -> skip ;
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EOL : [\r\n]+ -> skip ;
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NAME : [a-zA-Z_][a-zA-Z0-9_]* ;
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DEC_INTEGER : ('0'..'9') | (('1'..'9')('0'..'9')+);
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HEX_INTEGER : '$' (('a'..'f') | ('A'..'F') | ('0'..'9'))+ ;
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BIN_INTEGER : '%' ('0' | '1')+ ;
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FLOAT_NUMBER : FNUMBER (('E'|'e') ('+' | '-')? FNUMBER)? ; // sign comes later from unary expression
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fragment FNUMBER : ('0' .. '9') + ('.' ('0' .. '9') +)? ;
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fragment STRING_ESCAPE_SEQ : '\\' . | '\\' EOL;
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STRING :
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'"' ( STRING_ESCAPE_SEQ | ~[\\\r\n\f"] )* '"'
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{
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// get rid of the enclosing quotes
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String s = getText();
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setText(s.substring(1, s.length() - 1));
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}
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;
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module : statement* EOF ;
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statement :
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directive
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| varinitializer
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| vardecl
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| constdecl
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| memoryvardecl
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| assignment
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| augassignment
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;
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directive : '%' identifier (directivearg? | directivearg (',' directivearg)*) ;
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directivearg : identifier | integerliteral ;
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vardecl: datatype arrayspec? identifier ;
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varinitializer : datatype arrayspec? identifier '=' expression ;
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constdecl: 'const' varinitializer ;
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memoryvardecl: 'memory' varinitializer;
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datatype: 'byte' | 'word' | 'float' | 'str' | 'str_p' | 'str_s' | 'str_ps' ;
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arrayspec: '[' expression (',' expression)? ']' ;
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assignment : assign_target '=' expression ;
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augassignment :
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assign_target operator=('+=' | '-=' | '/=' | '//=' | '*=' | '**=' |
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'<<=' | '>>=' | '<<@=' | '>>@=' | '&=' | '|=' | '^=') expression
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;
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assign_target:
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register
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| identifier
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| scoped_identifier
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;
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expression :
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unaryexp = unary_expression
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| '(' precedence_expr=expression ')'
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| left = expression '**' right = expression
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| left = expression ('*' | '/' | '//' | '**') right = expression
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| left = expression ('+' | '-' | '%') right = expression
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| left = expression ('<<' | '>>' | '<<@' | '>>@' | '&' | '|' | '^') right = expression
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| left = expression ('and' | 'or' | 'xor') right = expression
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| left = expression ('==' | '!=' | '<' | '>' | '<=' | '>=') right = expression
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| literalvalue
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| register
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| identifier
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| scoped_identifier
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;
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unary_expression :
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operator = '~' expression
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| operator = ('+' | '-') expression
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| operator = 'not' expression
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;
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identifier : NAME ;
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scoped_identifier : NAME ('.' NAME)+ ;
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register : 'A' | 'X' | 'Y' | 'AX' | 'AY' | 'XY' | 'SC' | 'SI' | 'SZ' ;
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integerliteral : DEC_INTEGER | HEX_INTEGER | BIN_INTEGER ;
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booleanliteral : 'true' | 'false' ;
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arrayliteral : '[' expression (',' expression)* ']' ;
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stringliteral : STRING ;
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floatliteral : FLOAT_NUMBER ;
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literalvalue :
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integerliteral
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| booleanliteral
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| arrayliteral
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| stringliteral
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| floatliteral
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;
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