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  classDiagram
direction BT
class ASTNode {
  - List~ASTNode~ children
  - String value
  - TokenType type
  + addChild(ASTNode) void
  + evaluate() int
  + visit() void
  + toString() String
  + ASTNode(TokenType, String) 
}
class Lexer {
  - int pos
  - char currentChar
  - String input
  + tokenize() List~Token~
  - skipWhitespace() void
  - advance() void
  - number() String
  + Lexer(String) 
}
class Main {
  + main(String[]) void
  + Main() 
}
class Parser {
  - List~Token~ tokens
  - int pos
  + parse() ASTNode
  - factor() ASTNode?
  - expression() ASTNode
  - advance() void
  - currentToken() Token
  - term() ASTNode
  + Parser(List~Token~) 
}
class Token {
  - TokenType type
  - String value
  + getValue() String
  + toString() String
  + getType() TokenType
  + Token(TokenType, String) 
}
class TokenType {
<<enumeration>>
  +  NUMBER
  +  PLUS
  +  DIVIDE
  +  UNKNOWN
  +  MINUS
  +  MULTIPLY
  + values() TokenType[]
  + valueOf(String) TokenType
  + TokenType() 
}

ASTNode "1" *--> "type 1" TokenType 
Lexer  ..>  Token : «create»
Main  ..>  Lexer : «create»
Main  ..>  Parser : «create»
Parser  ..>  ASTNode : «create»
Parser "1" *--> "tokens *" Token 
Parser  ..>  Token : «create»
Token "1" *--> "type 1" TokenType

2022

01-02

这是测试页面

{
    "type": "line",
    "data": {
        "labels": ["January", "February", "March", "April", "May", "June", "July"],
        "datasets": [{
            "label": "My First dataset",
            "backgroundColor": "rgb(255, 99, 132)",
            "borderColor": "rgb(255, 99, 132)",
            "data": [0, 10, 5, 2, 20, 30, 45]
        }]
    },
    "options": {
        "responsive": true,
        "title": {
            "display": true,
            "text": "Chart.js Line Chart"
        }
    }
}

[{"url":"https://i.loli.net/2019/12/25/Fze9jchtnyJXMHN.jpg","alt":""},{"url":"https://i.loli.net/2019/12/25/ryLVePaqkYm4TEK.jpg","alt":""},{"url":"https://i.loli.net/2019/12/25/gEy5Zc1Ai6VuO4N.jpg","alt":""},{"url":"https://i.loli.net/2019/12/25/d6QHbytlSYO4FBG.jpg","alt":""},{"url":"https://i.loli.net/2019/12/25/6nepIJ1xTgufatZ.jpg","alt":""},{"url":"https://i.loli.net/2019/12/25/E7Jvr4eIPwUNmzq.jpg","alt":""},{"url":"https://i.loli.net/2019/12/25/mh19anwBSWIkGlH.jpg","alt":""},{"url":"https://i.loli.net/2019/12/25/2tu9JC8ewpBFagv.jpg","alt":""}]

$\begin{aligned} \dot{x} & = \sigma(y-x) \\ \dot{y} & = \rho x - y - xz \\ \dot{z} & = -\beta z + xy \end{aligned}$