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68 lines
937 B
68 lines
937 B
4 months ago
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tree grammar t047treeparserWalker;
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options {
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language=Python3;
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tokenVocab=t047treeparser;
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ASTLabelType=CommonTree;
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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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| ^(FUNC_DECL functionHeader)
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| ^(FUNC_DEF functionHeader block)
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;
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variable returns [res]
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: ^(VAR_DEF type declarator)
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{
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$res = $declarator.text;
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}
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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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: ^(FUNC_HDR type ID formalParameter+)
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;
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formalParameter
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: ^(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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: ^(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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;
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forStat
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: ^('for' expr expr expr block)
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;
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expr: ^(EQEQ expr expr)
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| ^(LT expr expr)
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| ^(PLUS expr expr)
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| ^(EQ ID expr)
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| atom
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;
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atom
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: ID
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| INT
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;
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