C++ 中的抽象语法树表示

For example, some classes would look like this (pseudocode):

class Ite extends Statement {
   Expression condition;
   Statement ifBranch;
   Statement elseBranch;
}


class Bop extends Expression {
   BOperator operator;  // +, -. * or whatever
   Expression left;     // Left operand
   Expression right;    // Right operand
}


class StatementBlock extends Statement {
   List<Statement> statements;
}


class Assignment extends Statement {
   AOperator assignOp;  // = += -= etc.
   LVal lvalue;         // The lvalue cannot be an arbitrary expression, you will usually have a specific type for it
   Expression rvalue;   // Right value
}

此外，您还需要某种方式来表示类型(对于 AST，仅静态类型就足够了，如果您的项目还需要实现一些后端，那么您还需要一些动态类型).

enum Type {
   CHAR,
   SHORT,
   INT,
   LONG,
   FLOAT,
   DOUBLE,
   ARRAY
}

class Float extends StaticType {
    final Type type = Type.FLOAT;
}

class Array extends StaticArray {
    final Type type = Type.ARRAY;

    int size;
}