Updated AST

This commit is contained in:
Erin 2021-06-06 21:09:18 +02:00 committed by ondra05
parent bccf5bc74b
commit e5c6feacb9

94
src/ast.rs Normal file
View file

@ -0,0 +1,94 @@
use crate::variables::Value;
type Span = std::ops::Range<usize>;
#[derive(Debug)]
pub struct Iden(String);
#[derive(Debug)]
pub struct Block {
pub block: Vec<Stmt>,
}
/// A syntactic unit expressing an effect.
#[derive(Debug)]
pub struct Stmt {
pub kind: StmtKind,
pub span: Span,
}
#[derive(Debug)]
pub enum StmtKind {
// Control flow
If {
cond: Expr,
body: Block,
},
Loop {
body: Block,
},
Break,
HopBack,
Var {
iden: Iden,
init: Option<Expr>,
},
Functio {
iden: Iden,
args: Vec<Iden>,
body: Block,
},
Call {
iden: Iden,
args: Vec<Expr>,
},
Print(Expr),
Melo(Iden),
}
impl Stmt {
pub fn new(kind: StmtKind, span: Span) -> Self {
Self { kind, span }
}
}
/// Expression is parse unit which do not cause any effect,
/// like math and logical operations or values.
#[derive(Debug)]
pub struct Expr {
kind: ExprKind,
span: Span,
}
#[derive(Debug)]
pub enum ExprKind {
Binary {
lhs: Box<Expr>,
rhs: Box<Expr>,
kind: BinOpKind,
},
Not(Box<Expr>),
Literal(Value),
}
impl Expr {
pub fn new(kind: ExprKind, span: Span) -> Self {
Self { kind, span }
}
}
#[derive(Debug)]
pub enum BinOpKind {
Add,
Subtract,
Multiply,
Divide,
Greater,
Less,
Equal,
NotEqual,
And,
Or,
}