语法分析器所用到的文法。
#notice：首字母大写的除了ID外为非终结符，剩下的为终结符，ID表示标识符。
#句子
Sentence --> Include | Statement | Assignment | Control | Expression | Constant | FunctionStatement | FunctionCall //克林闭包
#导入语句include
Include --> #include < ID > | #include "ID"
#声明语句
Statement --> Type ID; | Type ID[ Constant ]; | Type ID[ Constant ] = { ConstantList };
Type --> int | float
ConstantList --> ∑ | Constant ConstantRest
ConstantRest --> ∑ | ,Constant | ConstantRest
ConstantRest --> (,Constant)*
#赋值语句
Assignment --> ID = Expression;
#控制语句
Control --> IfControl | WhileControl | ForControl
IfElseControl --> IfControl ElseControl
IfControl --> if( Expression ){ Sentence }
ElseControl --> ∑ | else{ Sentence }
WhileControl --> while( Expression ){ Sentence }
ForControl --> for( Assignment; Expression; Expression ){ Sentence }
###表达式
Expression --> ( Expression ) | Expression Operator Expression | SingleOperator Expression | ArrayIndex | Constant
ArrayIndex --> ID[ Constant ]
SingleOperator --> ! | ++ | --
Operate --> + | - | * | / | ++ | -- | > | < | >= | <= | &
#常量
Constant --> Num | String
Num --> [0-9] | [1-9][0-9]+ //正则表达式表示
String --> [a-zA-Z0-9\n%:,.]+ //正则表达式表示
#函数声明、调用
FunctionStatement --> Type FunctionName( StateParameterList ){ Sentence }
StateParameterList --> ∑ | Parameter ParameterRest
Parameter --> Type ID
ParameterRest --> ∑ | ,Parameter | ParameterRest
Type --> int | float | char | double
FunctionCall --> ID( CallParameterList );
CallParameterList --> ∑ | ID ParameterRest
ParameterRest --> ∑ | ,ID | ParameterRest
#return语句
Return --> return Expresstion;