0264408
135 lines
2.2 KiB
Rust
135 lines
2.2 KiB
Rust
use crate::ast::stmt::Stmt;
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#[derive(Debug, Clone)]
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pub enum Expr {
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/// 字面量：number / string / bool / nil
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Literal(Literal),
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/// 变量引用
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Variable(String),
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/// 赋值表达式：a = b
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Assign {
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name: String,
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op: AssignOp,
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value: Box<Expr>,
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},
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/// 属性访问表达式：object.name
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Get {
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object: Box<Expr>,
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name: String,
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},
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/// 属性赋值表达式：object.name = value
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Set {
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object: Box<Expr>,
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name: String,
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op: AssignOp,
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value: Box<Expr>,
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},
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/// 对象字面量：{ key: value, ... }
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ObjectLiteral {
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properties: Vec<(String, Expr)>,
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},
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/// 数组字面量：[ expr, expr, ... ]
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ArrayLiteral {
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elements: Vec<Expr>,
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},
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/// 索引访问：expr[index]
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IndexGet {
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array: Box<Expr>,
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index: Box<Expr>,
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},
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/// 索引赋值：expr[index] = value
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IndexSet {
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array: Box<Expr>,
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index: Box<Expr>,
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op: AssignOp,
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value: Box<Expr>,
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},
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/// 一元运算：!expr / -expr
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Unary {
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op: UnaryOp,
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right: Box<Expr>,
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},
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/// 二元运算：a + b
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Binary {
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left: Box<Expr>,
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op: BinaryOp,
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right: Box<Expr>,
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},
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/// 逻辑运算：&& ||
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Logical {
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left: Box<Expr>,
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op: LogicalOp,
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right: Box<Expr>,
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},
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/// 函数调用
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Call {
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callee: Box<Expr>,
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arguments: Vec<Expr>,
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},
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/// 匿名函数（为闭包预留）
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Lambda {
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params: Vec<String>,
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body: Vec<Stmt>,
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},
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}
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#[derive(Debug, Clone)]
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pub enum Literal {
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Number(f64),
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String(String),
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Bool(bool),
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Nil,
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}
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#[derive(Debug, Clone, Copy)]
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pub enum UnaryOp {
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Negate, // -
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Not, // !
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}
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#[derive(Debug, Clone, Copy)]
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pub enum BinaryOp {
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Add,
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Sub,
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Mul,
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Div,
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Mod,
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Greater,
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GreaterEqual,
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Less,
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LessEqual,
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Equal,
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NotEqual,
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}
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#[derive(Debug, Clone, Copy)]
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pub enum LogicalOp {
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And,
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Or,
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}
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#[derive(Debug, Clone, Copy)]
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pub enum AssignOp {
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Equal, // =
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PlusEqual, // +=
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MinusEqual, // -=
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StarEqual, // *=
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SlashEqual, // /=
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PercentEqual, // %=
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}
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