kaon 0.1.4

A little scripting language written in rust
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129

use crate::compiler::{ASTNode, BinExpr, Expr, Ident, Op, ScriptFun, Stmt, Class, TypePath, ast::Constructor};

use super::ast::Trait;

/// A trait used for each pass the compiler makes.
///
/// Applies transformations to an [AST].
pub trait Pass<T: Default, E> {

    fn visit(&mut self, node: &ASTNode) {
        let _ = match node {
            ASTNode::Stmt(stmt) => self.statment(stmt),
            ASTNode::Expr(expr) => self.expression(expr),
        };
    }

    fn statment(&mut self, stmt: &Stmt) -> Result<T, E> {
        match stmt {
            Stmt::Block(stmts, _) => self.block(stmts),
            Stmt::IfStatement(expr, body, _) => self.if_statement(expr, body),
            Stmt::WhileStatement(expr, body, _) => self.while_statement(expr, body),
            Stmt::LoopStatement(body, _) => self.loop_statement(body),
            Stmt::ImportStatement(import, _) => self.import_statement(import),
            Stmt::VarDeclaration(ident, expr, _, _) => self.var_decl(ident, expr),
            Stmt::ConDeclaration(ident, expr, _, _) => self.con_decl(ident, expr),
            Stmt::AssignStatement(ident, expr, _) => self.assign_stmt(ident, expr),
            Stmt::Function(fun, _) => self.fun(fun),
            Stmt::Class(class, _) => self.class(class),
            Stmt::Constructor(constructor, _) => self.constructor(constructor),
            Stmt::Return(expr, _) => self.return_stmt(expr),
            Stmt::Break(_) => self.break_stmt(),
            Stmt::Continue(_) => self.continue_stmt(),
            Stmt::Expr(expr) => self.expression(expr),
            Stmt::Trait(trait_) => self.trait_decl(trait_),
        }
    }

    fn if_statement(&mut self, expr: &Expr, body: &(Stmt, Option<Stmt>)) -> Result<T, E>;

    fn while_statement(&mut self, expr: &Expr, body: &Stmt) -> Result<T, E>;

    fn loop_statement(&mut self, body: &Stmt) -> Result<T, E>;

    fn import_statement(&mut self, import: &Expr) -> Result<T, E>;

    fn block(&mut self, stmts: &[Stmt]) -> Result<T, E>;

    fn var_decl(&mut self, _ident: &Ident, init: &Option<Expr>) -> Result<T, E>;

    fn con_decl(&mut self, _ident: &Ident, expr: &Expr) -> Result<T, E>;

    fn assign_stmt(&mut self, _ident: &Expr, expr: &Expr) -> Result<T, E>;

    fn class(&mut self, _class: &Class) -> Result<T, E>;

    fn trait_decl(&mut self, _trait: &Trait) -> Result<T, E> {
        Ok(T::default())
    }

    fn constructor(&mut self, _constructor: &Constructor) -> Result<T, E>;

    fn fun(&mut self, _fun: &ScriptFun) -> Result<T, E>;

    fn return_stmt(&mut self, expr: &Option<Expr>) -> Result<T, E>;

    fn break_stmt(&mut self) -> Result<T, E>;

    fn continue_stmt(&mut self) -> Result<T, E>;

    fn expression(&mut self, expr: &Expr) -> Result<T, E> {
        match expr {
            Expr::Number(val, _) => self.number(val),
            Expr::String(val, _) => self.string(val),
            Expr::Boolean(val, _) => self.boolean(val),
            Expr::Unit(_) | Expr::Nil(_) => self.nil(),
            Expr::Identifier(ident) => self.identifier(ident),
            Expr::SelfExpr(_) => self.self_expr(),
            Expr::BinExpr(bin_expr, _) => self.binary_expr(bin_expr),
            Expr::UnaryExpr(op, unary_expr, _) => self.unary_expr(op, unary_expr),
            Expr::ParenExpr(expr, _) => self.expression(&*expr),
            Expr::Index(expr, index, _) => self.index(expr, index),
            Expr::List(list, _) => self.list((list).to_vec()),
            Expr::Tuple(tuple, _) => self.tuple(tuple),
            Expr::Map(map, _) => self.map(map),
            Expr::Or(lhs, rhs, _) => self.or(lhs, rhs),
            Expr::And(lhs, rhs, _) => self.and(lhs, rhs),
            Expr::FunCall(callee, args, _) => self.fun_call(callee, args),
            Expr::MemberExpr(obj, prop, _) => self.member_expr(obj, prop),
            Expr::AssocExpr(obj, prop, _) => self.assoc_expr(obj, prop),
            Expr::Type(typ, _) => self.type_spec(typ),
        }
    }

    fn type_spec(&mut self, typ: &TypePath) -> Result<T, E>;

    fn and(&mut self, lhs: &Expr, rhs: &Expr) -> Result<T, E>;

    fn or(&mut self, lhs: &Expr, rhs: &Expr) -> Result<T, E>;

    fn binary_expr(&mut self, bin_expr: &BinExpr) -> Result<T, E>;

    fn unary_expr(&mut self, _op: &Op, expr: &Expr) -> Result<T, E>;

    fn index(&mut self, expr: &Expr, index: &Expr) -> Result<T, E>;

    fn tuple(&mut self, tuple: &[Expr]) -> Result<T, E>;

    fn list(&mut self, list: Vec<Expr>) -> Result<T, E>;

    fn map(&mut self, map: &[(Expr, Expr)]) -> Result<T, E>;

    fn fun_call(&mut self, callee: &Expr, args: &[Expr]) -> Result<T, E>;

    fn member_expr(&mut self, obj: &Expr, prop: &Expr) -> Result<T, E>;

    fn assoc_expr(&mut self, obj: &Expr, prop: &Expr) -> Result<T, E>;

    fn self_expr(&mut self) -> Result<T, E>;

    fn identifier(&mut self, _ident: &Ident) -> Result<T, E>;

    fn number(&mut self, _val: &f64) -> Result<T, E>;

    fn string(&mut self, _val: &str) -> Result<T, E>;

    fn boolean(&mut self, _val: &bool) -> Result<T, E>;

    fn nil(&mut self) -> Result<T, E>;
}