114 lines
1.6 KiB
Plaintext
114 lines
1.6 KiB
Plaintext
grammar t047treeparser;
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options {
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language=Python3;
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output=AST;
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}
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tokens {
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VAR_DEF;
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ARG_DEF;
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FUNC_HDR;
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FUNC_DECL;
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FUNC_DEF;
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BLOCK;
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}
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program
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: declaration+
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;
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declaration
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: variable
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| functionHeader ';' -> ^(FUNC_DECL functionHeader)
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| functionHeader block -> ^(FUNC_DEF functionHeader block)
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;
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variable
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: type declarator ';' -> ^(VAR_DEF type declarator)
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;
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declarator
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: ID
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;
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functionHeader
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: type ID '(' ( formalParameter ( ',' formalParameter )* )? ')'
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-> ^(FUNC_HDR type ID formalParameter+)
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;
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formalParameter
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: type declarator -> ^(ARG_DEF type declarator)
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;
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type
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: 'int'
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| 'char'
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| 'void'
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| ID
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;
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block
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: lc='{'
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variable*
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stat*
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'}'
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-> ^(BLOCK[$lc,"BLOCK"] variable* stat*)
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;
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stat: forStat
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| expr ';'!
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| block
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| assignStat ';'!
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| ';'!
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;
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forStat
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: 'for' '(' start=assignStat ';' expr ';' next=assignStat ')' block
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-> ^('for' $start expr $next block)
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;
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assignStat
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: ID EQ expr -> ^(EQ ID expr)
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;
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expr: condExpr
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;
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condExpr
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: aexpr ( ('=='^ | '<'^) aexpr )?
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;
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aexpr
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: atom ( '+'^ atom )*
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;
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atom
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: ID
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| INT
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| '(' expr ')' -> expr
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;
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FOR : 'for' ;
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INT_TYPE : 'int' ;
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CHAR: 'char';
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VOID: 'void';
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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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EQ : '=' ;
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EQEQ : '==' ;
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LT : '<' ;
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PLUS : '+' ;
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WS : ( ' '
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| '\t'
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| '\r'
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| '\n'
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)+
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{ $channel=HIDDEN }
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;
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