grammar.txt

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。

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'句子
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Sentence --> Include | Statement | Assignment | Control | Expression | Constant | FunctionStatement | FunctionCall //克林闭包


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'导入语句include
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Include --> #include < ID > | #include "ID"


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'声明语句
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Statement --> Type ID; | Type ID[ Constant ]; | Type ID[ Constant ] = { ConstantList };
Type --> int | float 
ConstantList --> ∑ | Constant ConstantRest
ConstantRest --> ∑ | ,Constant | ConstantRest
ConstantRest --> (,Constant)*


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'赋值语句
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Assignment --> ID = Expression;


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'控制语句
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Control --> IfControl | WhileControl | ForControl
IfElseControl --> IfControl ElseControl
IfControl --> if( Expression ){ Sentence }
ElseControl --> ∑ | else{ Sentence } 
WhileControl --> while( Expression ){ Sentence }
ForControl --> for( Assignment; Expression; Expression ){ Sentence }


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'表达式
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Expression --> ( Expression ) | Expression Operator Expression | SingleOperator Expression | ArrayIndex | Constant
ArrayIndex --> ID[ Constant ]
SingleOperator --> ! | ++ | --
Operate --> + | - | * | / | ++ | -- | > | < | >= | <= | &


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'常量
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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


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'函数声明、调用
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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


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'return语句
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Return --> return Expresstion;