Struct rcalc::ASTNode

pub struct ASTNode { /* fields omitted */ }

Describes a node in an Abstract Syntax Tree.

We can imagine an AST to look like a tree from a root-down approach:

AST:
       [Root Token]
  [LToken]    [RToken]
[...]       [...]  [...]

Looking at any node in the tree, we see that it consists of its own value and 0-2 children. Thus, we define an ASTNode to be a Token with up to two neighboring ASTNodes.

Methods

impl ASTNode

fn from(token: Token, children: Vec<ASTNode>) -> ASTNode

Creates an ASTNode from a Token and a vector of children nodes.

let token = Token::NUMBER(5);
let children : Vec<ASTNode> = vec![];
let node = ASTNode::from(token, children);

fn token(&self) -> &Token

Returns the token of an ASTNode.

fn children(&self) -> &Vec<ASTNode>

Returns the children of an ASTNode as a Vec.