0
我使用以下語法定義了算術表達式的語法。它是一個更復雜整體的子集，但問題只發生在我將語法擴展到包含邏輯運算時。ANTLRWorks - 代碼生成卡住而不生成
當我嘗試使用antlrworks編碼gen時，甚至需要很長時間才能開始生成。我認爲問題在於paren的規則，因爲它包含了一個循環到expr的開始。在固定任何幫助，這將事先很大
感謝
的選項：用於進行語法
options {
tokenVocab = MAliceLexer;
backtrack = true;
}
代碼如下：
type returns [ASTTypeNode n]
: NUMBER {$n = new IntegerTypeNode();}
| LETTER {$n = new CharTypeNode();}
| SENTENCE { $n = new StringTypeNode();}
;
term returns [ASTNode n]
: IDENTIFIER {$n = new IdentifierNode($IDENTIFIER.text);}
| CHAR {$n = new LetterNode($CHAR.text.charAt(1));}
| INTEGER {$n = new NumberNode(Integer.parseInt($INTEGER.text));}
| STRING { $n = new StringNode($STRING.text); }
;
paren returns [ASTNode n]
:term { $n = $term.n; }
| LPAR expr RPAR { $n = $expr.n; }
;
negation returns [ASTNode n]
:BITNEG (e = negation) {$n = new BitNotNode($e.n);}
| paren {$n = $paren.n;}
;
unary returns [ASTNode n]
:MINUS (u =unary) {$n = new NegativeNode($u.n);}
| negation {$n = $negation.n;}
;
mult returns [ASTNode n]
: unary DIV (m = mult) {$n = new DivideNode($unary.n, $m.n);}
| unary MULT (m = mult) {$n = new MultiplyNode($unary.n, $m.n);}
| unary MOD (m=mult) {$n = new ModNode($unary.n, $m.n);}
| unary {$n = $unary.n;}
;
binAS returns [ASTNode n]
: mult PLUS (b=binAS) {$n = new AdditionNode($mult.n, $b.n);}
| mult MINUS (b=binAS) {$n = new SubtractionNode($mult.n, $b.n);}
| mult {$n = $mult.n;}
;
comp returns [ASTNode n]
: binAS GREATEREQ (e =comp) {$n = new GreaterEqlNode($binAS.n, $e.n);}
|binAS GREATER (e = comp) {$n = new GreaterNode($binAS.n, $e.n);}
|binAS LESS (e = comp) {$n = new LessNode($binAS.n, $e.n);}
|binAS LESSEQ (e = comp) {$n = new LessEqNode($binAS.n, $e.n);}
|binAS {$n = $binAS.n;}
;
equality returns [ASTNode n]
: comp EQUAL (e = equality) {$n = new EqualNode($comp.n, $e.n);}
|comp NOTEQUAL (e = equality) {$n = new NotEqualNode($comp.n, $e.n);}
|comp { $n = $comp.n; }
;
bitAnd returns [ASTNode n]
: equality BITAND (b=bitAnd) {$n = new BitAndNode($equality.n, $b.n);}
| equality {$n = $equality.n;}
;
bitXOr returns [ASTNode n]
: bitAnd BITXOR (b = bitXOr) {$n = new BitXOrNode($bitAnd.n, $b.n);}
| bitAnd {$n = $bitAnd.n;}
;
bitOr returns [ASTNode n]
: bitXOr BITOR (e =bitOr) {$n = new BitOrNode($bitXOr.n, $e.n);}
| bitXOr {$n = $bitXOr.n;}
;
logicalAnd returns [ASTNode n]
: bitOr LOGICALAND (e = logicalAnd){ $n = new LogicalAndNode($bitOr.n, $e.n); }
| bitOr { $n = $bitOr.n; }
;
expr returns [ASTNode n]
: logicalAnd LOGICALOR (e = expr) { $n = new LogicalOrNode($logicalAnd.n, $e.n); }
| IDENTIFIER INC {$n = new IncrementNode(new IdentifierNode($IDENTIFIER.text));}
| IDENTIFIER DEC {$n = new DecrementNode(new IdentifierNode($IDENTIFIER.text));}
| logicalAnd {$n = $logicalAnd.n;}
;
`