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#[derive(Debug)]
pub struct Program {
pub stanzas: Vec<Stanza>,
}
impl Program {
pub fn new() -> Self {
Self {
stanzas: Vec::new(),
}
}
pub fn from_str(mut self, i: &str) -> Result<Self, nom::error::Error<&str>> {
use nom::Finish;
let (remaining_input, stanzas) = crate::parser::parse_file(i).finish()?;
assert!(remaining_input.trim().is_empty(), "{remaining_input}");
self.stanzas = stanzas;
Ok(self)
}
}
#[derive(Debug, PartialEq, Eq)]
pub struct Stanza {
pub pattern: Pattern,
pub statements: Block,
}
#[derive(Debug, Eq, PartialEq, Clone)]
pub enum Pattern {
Begin,
End,
Node(NodePattern),
}
#[derive(Debug, Eq, PartialEq, Clone)]
pub struct NodePattern {
pub modifier: Modifier,
pub kind: String,
}
#[derive(Default, Debug, Eq, PartialEq, Clone, Copy)]
pub enum Modifier {
#[default]
Enter,
Leave,
}
#[derive(Debug, Default, Eq, PartialEq, Clone)]
pub struct Block {
pub body: Vec<Statement>,
}
#[derive(Debug, Eq, PartialEq, Clone)]
pub enum Statement {
Bare(Expr),
Declaration(Declaration),
}
#[derive(Debug, Eq, PartialEq, Clone)]
pub enum Expr {
Node,
Unit,
Lit(Literal),
Ident(Identifier),
FieldAccess(Box<Expr>, Identifier),
Index(Box<Expr>, Box<Expr>),
Bin(Box<Expr>, BinOp, Box<Expr>),
Unary(Box<Expr>, UnaryOp),
Call(Call),
List(List),
If(IfExpr),
Block(Block),
}
impl Expr {
pub fn boxed(self) -> Box<Expr> {
Box::new(self)
}
pub fn as_ident(self) -> Option<Identifier> {
match self {
Self::Ident(i) => Some(i),
_ => None,
}
}
}
#[derive(Debug, Eq, PartialEq, Clone, Copy)]
pub enum UnaryOp {
Not,
}
#[derive(Debug, Eq, PartialEq, Clone, Copy)]
pub enum BinOp {
Arith(ArithOp),
Cmp(CmpOp),
Logic(LogicOp),
// =
Assign(AssignOp),
}
// + - * /
#[derive(Debug, Eq, PartialEq, Clone, Copy)]
pub enum ArithOp {
Add,
Sub,
Mul,
Div,
Mod,
}
// && ||
#[derive(Debug, Eq, PartialEq, Clone, Copy)]
pub enum LogicOp {
And,
Or,
}
// == != > < >= <=
#[derive(Debug, Eq, PartialEq, Clone, Copy)]
pub enum CmpOp {
Eq,
Neq,
Gt,
Lt,
Gte,
Lte,
}
// =, +=, -=, *=, /=
#[derive(Debug, Eq, PartialEq, Clone, Copy)]
pub struct AssignOp {
pub op: Option<ArithOp>,
}
pub type Identifier = String;
#[derive(Debug, Eq, PartialEq, Clone)]
pub enum Literal {
Str(String),
Int(i128),
Bool(bool),
}
/// A function call
#[derive(Debug, Eq, PartialEq, Clone)]
pub struct Call {
pub function: Identifier,
pub parameters: Vec<Expr>,
}
impl From<Call> for Expr {
fn from(expr: Call) -> Expr {
Expr::Call(expr)
}
}
/// A list construction expression
#[derive(Debug, Eq, PartialEq, Clone)]
pub struct List {
pub items: Vec<Expr>,
}
impl From<List> for Expr {
fn from(list: List) -> Expr {
Expr::List(list)
}
}
#[derive(Debug, PartialEq, Eq, Clone, Copy)]
pub enum Type {
Unit,
Integer,
String,
Boolean,
Node,
List,
}
#[derive(Debug, PartialEq, Eq, Clone)]
pub struct Declaration {
pub ty: Type,
pub name: Identifier,
pub init: Option<Box<Expr>>,
}
#[derive(Debug, Eq, PartialEq, Clone)]
pub struct IfExpr {
pub condition: Box<Expr>,
pub then: Block,
pub else_: Block,
}
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