Enum Node

pub enum Node<'a> {
    Null,
    Bool(bool),
    Number(Decimal),
    String(&'a str),
    TemplateString(&'a [&'a Node<'a>]),
    Pointer,
    Array(&'a [&'a Node<'a>]),
    Object(&'a [(&'a Node<'a>, &'a Node<'a>)]),
    Identifier(&'a str),
    Closure(&'a Node<'a>),
    Parenthesized(&'a Node<'a>),
    Root,
    Member {
        node: &'a Node<'a>,
        property: &'a Node<'a>,
    },
    Slice {
        node: &'a Node<'a>,
        from: Option<&'a Node<'a>>,
        to: Option<&'a Node<'a>>,
    },
    Interval {
        left: &'a Node<'a>,
        right: &'a Node<'a>,
        left_bracket: Bracket,
        right_bracket: Bracket,
    },
    Conditional {
        condition: &'a Node<'a>,
        on_true: &'a Node<'a>,
        on_false: &'a Node<'a>,
    },
    Unary {
        node: &'a Node<'a>,
        operator: Operator,
    },
    Binary {
        left: &'a Node<'a>,
        operator: Operator,
        right: &'a Node<'a>,
    },
    FunctionCall {
        kind: FunctionKind,
        arguments: &'a [&'a Node<'a>],
    },
    MethodCall {
        kind: MethodKind,
        this: &'a Node<'a>,
        arguments: &'a [&'a Node<'a>],
    },
    Error {
        node: Option<&'a Node<'a>>,
        error: AstNodeError<'a>,
    },
}

抽象语法树节点枚举 定义了表达式中所有可能的节点类型

Variants

Null

空值节点

Bool(bool)

布尔值节点

Number(Decimal)

数字节点（使用高精度十进制）

String(&'a str)

字符串节点

TemplateString(&'a [&'a Node<'a>])

模板字符串节点（包含多个子节点的数组）

Pointer

指针节点（回调引用 #）

Array(&'a [&'a Node<'a>])

数组节点

Object(&'a [(&'a Node<'a>, &'a Node<'a>)])

对象节点（键值对数组）

Identifier(&'a str)

标识符节点

Closure(&'a Node<'a>)

闭包节点

Parenthesized(&'a Node<'a>)

括号表达式节点

Root

根节点（$ 引用）

Member

成员访问节点（对象.属性 或 对象[“属性”]）

Fields

node: &'a Node<'a>

property: &'a Node<'a>

Slice

切片节点（数组[from:to]）

Fields

node: &'a Node<'a>

from: Option<&'a Node<'a>>

to: Option<&'a Node<'a>>

Interval

区间节点（[a, b] 或 (a, b) 等）

Fields

left: &'a Node<'a>

right: &'a Node<'a>

left_bracket: Bracket

right_bracket: Bracket

Conditional

条件表达式节点（三元操作符 condition ? true_expr : false_expr）

Fields

condition: &'a Node<'a>

on_true: &'a Node<'a>

on_false: &'a Node<'a>

Unary

一元操作节点（如 -x, !x, +x）

Fields

node: &'a Node<'a>

operator: Operator

Binary

二元操作节点（如 x + y, x == y）

Fields

left: &'a Node<'a>

operator: Operator

right: &'a Node<'a>

FunctionCall

函数调用节点

Fields

kind: FunctionKind

arguments: &'a [&'a Node<'a>]

MethodCall

方法调用节点

Fields

kind: MethodKind

this: &'a Node<'a>

arguments: &'a [&'a Node<'a>]

Error

错误节点（包含解析错误信息）

Fields

node: Option<&'a Node<'a>>

error: AstNodeError<'a>

Implementations

impl<'a> Node<'a>

pub fn walk<F>(&self, func: F)

where F: FnMut(&Self) + Clone,

遍历AST节点 对每个节点（包括子节点）执行指定的函数

pub fn first_error(&self) -> Option<AstNodeError<'_>>

查找AST中的第一个错误 返回第一个遇到的错误节点中的错误信息

pub fn has_error(&self) -> bool

检查AST是否包含错误节点

Trait Implementations

impl<'a> Clone for Node<'a>

fn clone(&self) -> Node<'a>

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<'a> Debug for Node<'a>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'a, '_derivative_strum> From<&'_derivative_strum Node<'a>> for &'static str

fn from(x: &'_derivative_strum Node<'a>) -> &'static str

Converts to this type from the input type.

impl<'a> From<Node<'a>> for &'static str

fn from(x: Node<'a>) -> &'static str

Converts to this type from the input type.

impl<'a> PartialEq for Node<'a>

fn eq(&self, other: &Node<'a>) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<'a> StructuralPartialEq for Node<'a>