poreader 1.1.2

Read translation catalogs in PO format.
Documentation 
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grammar;

use crate::plural::formula::node::{Node, BinOp, UnOp};

extern {
    type Error = String;
}

pub(in crate::plural::formula) Formula = Expr;

Expr: Node = {
    <test:Or> "?" <if_true:Expr> ":" <if_false:Expr> => Node::new_cond(test, if_true, if_false),
    Or,
};

Or: Node = {
    <l:Or> "||" <r:And> => Node::new_binop(BinOp::Or, l, r),
    <l:Or> "or" <r:And> => Node::new_binop(BinOp::Or, l, r),
    And,
};

And: Node = {
    <l:And> "&&" <r:Logical> => Node::new_binop(BinOp::And, l, r),
    <l:And> "and" <r:Logical> => Node::new_binop(BinOp::And, l, r),
    Logical,
};

Logical: Node = {
    <l:Logical> "==" <r:Not> => Node::new_binop(BinOp::Eq, l, r),
    <l:Logical> "!=" <r:Not> => Node::new_binop(BinOp::Ne, l, r),
    <l:Logical> "<" <r:Not> => Node::new_binop(BinOp::Lt, l, r),
    <l:Logical> "<=" <r:Not> => Node::new_binop(BinOp::Lte, l, r),
    <l:Logical> ">" <r:Not> => Node::new_binop(BinOp::Gt, l, r),
    <l:Logical> ">=" <r:Not> => Node::new_binop(BinOp::Gte, l, r),
    Not,
};

Not: Node = {
    "!" <r:Add> => Node::new_unop(UnOp::Not, r),
    "not" <r:Add> => Node::new_unop(UnOp::Not, r),
    Add,
};

Add: Node = {
    <l:Add> "+" <r:Mul> => Node::new_binop(BinOp::Add, l, r),
    <l:Add> "-" <r:Mul> => Node::new_binop(BinOp::Sub, l, r),
    Mul,
};

Mul: Node = {
    <l:Mul> "*" <r:Factor> => Node::new_binop(BinOp::Mul, l, r),
    <l:Mul> "/" <r:Factor> => Node::new_binop(BinOp::Div, l, r),
    <l:Mul> "%" <r:Factor> => Node::new_binop(BinOp::Mod, l, r),
    Factor,
}

Factor: Node = {
    "-" <r:Term> => Node::new_unop(UnOp::Neg, r),
    Term,
};

Term: Node = {
    <n:Num> => Node::new_num(n),
    "n" => Node::Var,
    "(" <Expr> ")",
};

Num: i64 = r"[0-9]+" =>? match (<>).parse() {
    Ok(v) => Ok(v),
    Err(err) => Err(err.to_string().into()),
};