dash_lang/
ast.rs

1use std::collections::HashMap;
2
3/// Stores the runtime context for the interpreter, including variables and user-defined functions.
4#[derive(Default)]
5pub struct Context {
6    /// A map of variable names to their string values.
7    pub variables: HashMap<String, String>,
8    /// A map of function names to their parameter list and body.
9    pub functions: HashMap<String, (Vec<String>, Vec<Stmt>)>,
10}
11
12/// Represents an expression in the language.
13#[derive(Debug, Clone)]
14pub enum Expr {
15    /// An integer literal.
16    Int(i64),
17    /// A string literal.
18    Str(String),
19    /// A variable reference.
20    Var(String),
21    /// A function call with arguments.
22    Call(String, Vec<Expr>),
23    /// A binary operation (e.g., addition, comparison).
24    Binary(Box<Expr>, Op, Box<Expr>),
25}
26
27/// Represents a statement in the language.
28#[derive(Debug, Clone)]
29pub enum Stmt {
30    /// Prints the result of an expression.
31    Print(Expr),
32    /// Declares or updates a variable.
33    Let(String, Expr),
34    /// Conditional execution.
35    If {
36        condition: Expr,
37        then_branch: Vec<Stmt>,
38        else_branch: Option<Vec<Stmt>>,
39    },
40    /// Looping construct.
41    While {
42        condition: Expr,
43        body: Vec<Stmt>,
44    },
45    /// Exits a loop early.
46    Break,
47    /// Skips to the next loop iteration.
48    Continue,
49    /// Defines a function.
50    Fn {
51        name: String,
52        params: Vec<String>,
53        body: Vec<Stmt>,
54    },
55    /// Calls a function as a statement.
56    Call(String, Vec<Expr>),
57    /// Returns a value from a function.
58    Return(Expr),
59}
60
61/// Supported binary operators.
62#[derive(Debug, Clone)]
63pub enum Op {
64    Add,
65    Sub,
66    Mul,
67    Div,
68    Greater,
69    Less,
70    GreaterEq,
71    LessEq,
72    Equal,
73    NotEqual,
74}
75
76/// Internal control flow used during execution.
77pub enum LoopControl {
78    None,
79    Break,
80    Continue,
81    Return(String),
82}
dash_lang/ast.rs

dash_lang/
ast.rs
