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use ast::*; | |
use std::str::FromStr; | |
grammar; | |
pub Entry: () = { | |
"#" "[" "entry" "]" => (), | |
}; | |
pub Statement: Statement<'input> = { | |
"let" <var:Variable> "=" <init_expr: Expr> ";" | |
=> Statement::VariableDef(VariableDef{ | |
var, | |
init_expr | |
}), | |
<entry: Entry?> "fn" <ident: Name> "(" <params: Comma<Variable>> ")" <ty:("->" <Name>)?> <block: Block> | |
=> { | |
Statement::FunctionDef( | |
FunctionDef{ | |
ident: Ident(ident), | |
params, | |
ret_ty: if let Some(ty) = ty {Type::from(ty)} else {Type::Void}, | |
block, | |
is_entry: entry.is_some() | |
} | |
) | |
}, | |
<s: Struct> => Statement::StructDef(s) | |
}; | |
Comma<T>: Vec<T> = { // (1) | |
<v:(<T> ",")*> <e:T?> => match e { // (2) | |
None => v, | |
Some(e) => { | |
let mut v = v; | |
v.push(e); | |
v | |
} | |
} | |
}; | |
pub Struct: Struct<'input> = { | |
"struct" <ident: Name> "{" <members: Comma<Variable>> "}" | |
=> Struct{ident: Ident(ident), members: members } | |
}; | |
pub Variable: Variable<'input> = { | |
<ident: Name> ":" <ty_name:Name> => Variable(Ident(ident), Type::from(ty_name)) | |
}; | |
pub Literal: Literal<'input> = { | |
<var:Number> => Literal::Number(var), | |
r#"""# <var:Name> r#"""# => Literal::Str(var) | |
}; | |
pub AtomicExpr: Box<Expr<'input>> = { | |
<lit:Literal> => Box::new(Expr::Literal(lit)), | |
<name: Name> => Box::new(Expr::NamedVariable(Ident(name))), | |
<name: Name> "(" <expr: Comma<Expr>> ")" => Box::new(Expr::FunctionCall(FunctionCall{ident: Ident(name), arguments: expr })), | |
"(" ")" => Box::new(Expr::Void), | |
}; | |
pub Expr: Box<Expr<'input>> = { | |
<l: AtomicExpr> "+" <r: Addition> => Box::new(Expr::Addition(l, r)), | |
"(" <Expr> ")", | |
AtomicExpr | |
}; | |
pub Block: Block<'input> = { | |
"{" <stmt:Statement*> <expr:Expr?> "}" => Block(stmt, expr.unwrap_or(Box::new(Expr::Void))) | |
}; | |
pub Scope: Scope<'input> = { | |
<stmt:Statement*> => Scope::Module(Module(stmt)) | |
}; | |
Number: isize = <s:Num> => isize::from_str(s).unwrap(); | |
Name: &'input str = <s:Ident> => s; | |
match{ | |
"*", | |
"+", | |
r"[0-9]+" => Num, | |
":", | |
"(", | |
")", | |
"=", | |
"let", | |
";", | |
r#"""#, | |
"{", | |
"}", | |
"fn", | |
",", | |
"->", | |
"struct", | |
"entry", | |
"#", | |
"[", | |
"]", | |
} | |
else{ | |
r"\w+" => Ident, | |
} |
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