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#![crate_type = "proc-macro"]
#![feature(proc_macro_hygiene, proc_macro_quote)]
extern crate pest;
#[macro_use]
extern crate pest_derive;
extern crate proc_macro;
use parser::{Parser as ViewParser, Rule};
use pest::iterators::{Pair, Pairs};
use pest::Parser;
use proc_macro::{quote, Literal, TokenStream, TokenTree};
use std::iter::FromIterator;
use std::str::FromStr;
mod parser {
#[derive(Parser)]
#[grammar = "view.pest"]
pub struct Parser;
}
fn get_token_stream(mut tag_pairs: Pairs<Rule>) -> TokenStream {
let name = tag_pairs.next().expect("name").as_str();
let _name = TokenTree::Literal(Literal::string(name));
let mut attributes = vec![];
let mut handlers = vec![];
let vec: Vec<Pair<Rule>> = tag_pairs.next().expect("attributes").into_inner().collect();
for i in 0..(vec.len() / 2) {
let j = i * 2;
let k = &vec[j].as_str();
let v = &vec[j + 1];
let _v = match v.as_rule() {
Rule::embedded => {
let mut _embedded = TokenStream::from_str(v.as_str()).unwrap();
quote!($_embedded.into())
}
Rule::string => {
let _v = TokenTree::Literal(Literal::string(v.as_str()));
quote! { $_v.into() }
}
Rule::bool => {
let _v = TokenStream::from_str(v.as_str()).unwrap();
quote! { $_v.into() }
}
_ => unreachable!(),
};
if k.starts_with("on") {
let (_, k) = k.split_at(2);
let _k = TokenTree::Literal(Literal::string(k));
handlers.push(quote! {
($_k.to_string(), _squark::handler($_v)),
});
continue;
}
let _k = TokenTree::Literal(Literal::string(k));
attributes.push(quote! {
($_k.to_string(), $_v),
});
}
let _attributes = TokenStream::from_iter(attributes);
let _handlers = TokenStream::from_iter(handlers);
let mut children = vec![];
if let Some(children_pair) = tag_pairs.next() {
for p in children_pair.into_inner() {
let token = match p.as_rule() {
Rule::tag => {
let _tag = get_token_stream(p.into_inner());
quote! {
_squark::Child::from($_tag),
}
}
Rule::text => {
let _text = TokenTree::Literal(Literal::string(p.as_str()));
quote! {
$_text.into(),
}
}
Rule::embedded => {
let _embedded = TokenStream::from_str(p.as_str()).unwrap();
quote! {
{$_embedded}.into(),
}
}
_ => unreachable!(),
};
children.push(token);
}
}
let _children = TokenStream::from_iter(children);
quote! {
_squark::View::new(
$_name.to_string(),
vec![
$_attributes
],
vec![
$_handlers
],
vec![
$_children
]
)
}
}
#[proc_macro]
pub fn view(arg: TokenStream) -> TokenStream {
let s = arg.to_string();
let mut pairs = ViewParser::parse(Rule::view, &s).unwrap();
let _token = get_token_stream(pairs.next().unwrap().into_inner());
quote! {
{
extern crate squark as _squark;
$_token
}
}
}