177 lines
3.0 KiB
Plaintext
177 lines
3.0 KiB
Plaintext
grammar Congress;
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options {
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language=Python;
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output=AST;
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ASTLabelType=CommonTree;
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}
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tokens {
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PROG;
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COMMA=',';
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COLONMINUS=':-';
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LPAREN='(';
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RPAREN=')';
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// Structure
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THEORY;
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STRUCTURED_NAME;
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// Kinds of Formulas
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RULE;
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LITERAL;
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ATOM;
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NOT;
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// Terms
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VARIABLE;
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STRING_OBJ;
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INTEGER_OBJ;
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FLOAT_OBJ;
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SYMBOL_OBJ;
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}
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prog
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: formula formula* EOF -> ^(THEORY formula+)
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| EOF
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;
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formula
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: bare_formula formula_terminator? -> bare_formula
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;
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formula_terminator
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: ';'
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| '.'
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;
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bare_formula
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: rule
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| formula
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;
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rule
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: atom COLONMINUS literal_list -> ^(RULE atom literal_list)
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;
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literal_list
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: literal (COMMA literal)* -> literal+
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;
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literal
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: atom -> atom
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| NEGATION atom -> ^(NOT atom)
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;
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NEGATION
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: 'not'
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| 'NOT'
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| '!'
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;
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atom
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: relation_constant LPAREN term_list RPAREN -> ^(ATOM relation_constant term_list)
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| propositional_constant -> ^(ATOM propositional_constant)
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;
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term_list
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: term (COMMA term)* -> term+
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;
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term
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: object_constant
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| variable
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;
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object_constant
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: INT -> ^(INTEGER_OBJ INT)
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| FLOAT -> ^(FLOAT_OBJ FLOAT)
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| STRING -> ^(STRING_OBJ STRING)
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;
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variable
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: ID -> ^(VARIABLE ID)
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;
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relation_constant
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: ID (':' ID)* -> ^(STRUCTURED_NAME ID+)
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;
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propositional_constant
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: ID
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;
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SYMBOL
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: ':' ID
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;
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ID : ('a'..'z'|'A'..'Z'|'_') ('a'..'z'|'A'..'Z'|'0'..'9'|'_')*
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;
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INT : '0'..'9'+
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;
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FLOAT
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: ('0'..'9')+ '.' ('0'..'9')* EXPONENT?
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| '.' ('0'..'9')+ EXPONENT?
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| ('0'..'9')+ EXPONENT
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;
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COMMENT
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: '//' ~('\n'|'\r')* '\r'? '\n' {$channel=HIDDEN;}
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| '/*' ( options {greedy=false;} : . )* '*/' {$channel=HIDDEN;}
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;
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WS : ( ' '
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| '\t'
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| '\r'
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| '\n'
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) {$channel=HIDDEN;}
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;
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// Characters in string are either
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// (i) any character except ", carriage-return, linefeed, backslash
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// (ii) an escape sequence like \t, \n, \r
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// (iii) or a universal character name like \u10af
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// Order of the above 3 in the following rule is important.
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STRING
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: '"' (~('"' | '\r' | '\n' | '\\')
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| ESC_SEQ )*
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'"'
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;
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// Escape sequences
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// Simple escape sequences like \n, \t, \\ are taken from Stroustrup.
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// Octal escape sequences are either 1, 2, or 3 octal digits exactly.
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// Hexadecimal escape sequences begin with \x and continue until non-hex found.
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// No handling of tri-graph sequences.
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CHAR: '\'' ( ESC_SEQ | ~('\''|'\\') ) '\''
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;
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fragment
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EXPONENT : ('e'|'E') ('+'|'-')? ('0'..'9')+ ;
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fragment
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HEX_DIGIT : ('0'..'9'|'a'..'f'|'A'..'F') ;
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fragment
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ESC_SEQ
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: '\\' ('b'|'t'|'n'|'f'|'r'|'"'|'\''|'\\')
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| UNICODE_ESC
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| OCTAL_ESC
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;
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fragment
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OCTAL_ESC
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: '\\' ('0'..'3') ('0'..'7') ('0'..'7')
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| '\\' ('0'..'7') ('0'..'7')
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| '\\' ('0'..'7')
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;
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fragment
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UNICODE_ESC
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: '\\' 'u' HEX_DIGIT HEX_DIGIT HEX_DIGIT HEX_DIGIT
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;
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