爲什麼規則不起作用？

Question

VARNAME:[_a-zA-Z0-9.]+; 

prog:expression +; 

expression: VARNAME | 
    '!' expression | 
    expression '=' expression | 
    expression '+=' expression | 
    expression '-=' expression | 
    expression ('<'|'>') expression | 
    expression expression | 
    expression ('+'|'-'|'*'|'/'|'%') expression | 
    expression ('=='|'!=') expression | 
    expression ('>='|'<=') expression | 
    expression ('&&'|'||') expression | 
    expression ('++'|'--') | 
    ('++'|'--') expression |  
    '(' expression ')'| 
    '\'' expression '\'' | 
    expression ',' expression | 
    expression '*' | 
    '(' expression ')' expression | 
    expression '->' expression | 
    expression expression |   //var decl 
    expression '<' expression '>' expression | //class template 
    expression '[' expression ']' |   //array 
    expression '.' expression |   //class obj 
    expression '(' expression? ')' |   //func call 
    '{' expression '}'; 

解析文本：

(CKbdpBase*)handle->open(); 

的規則不起作用，它注意到"(CKbdpBase*)"不能正確解析。

如何修復規則？

Answer 1

我想你錯過：

• VARNAME內expression
• 一個分號prog統治結束：prog: expression + ';' ;