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use nom::{self, IResult};
pub enum Expr<'a> {
Var(&'a [u8]),
}
pub enum Node<'a> {
Lit(&'a [u8]),
Expr(Expr<'a>),
}
fn take_content(i: &[u8]) -> IResult<&[u8], Node> {
if i.len() < 1 || i[0] == b'{' {
return IResult::Error(error_position!(nom::ErrorKind::TakeUntil, i));
}
for (j, c) in i.iter().enumerate() {
if *c == b'{' {
if i.len() < j + 2 {
return IResult::Done(&i[..0], Node::Lit(&i[..]));
} else if i[j + 1] == '{' as u8 {
return IResult::Done(&i[j..], Node::Lit(&i[..j]));
} else if i[j + 1] == '%' as u8 {
return IResult::Done(&i[j..], Node::Lit(&i[..j]));
}
}
}
IResult::Done(&i[..0], Node::Lit(&i[..]))
}
named!(expr_var<Expr>, map!(ws!(nom::alphanumeric), Expr::Var));
named!(any_expr<Expr>, delimited!(tag!("{{"), expr_var, tag!("}}")));
named!(expr_node<Node>, map!(any_expr, Node::Expr));
named!(parse_template< Vec<Node> >, many1!(alt!(take_content | expr_node)));
pub fn parse<'a>(src: &'a str) -> Vec<Node> {
match parse_template(src.as_bytes()) {
IResult::Done(_, res) => res,
_ => panic!("problems parsing template source"),
}
}
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