html_macro/
lib.rs

1extern crate proc_macro;
2
3use crate::parser::HtmlParser;
4use crate::tag::Tag;
5use syn::parse::{Parse, ParseStream, Result};
6use syn::parse_macro_input;
7
8mod parser;
9mod tag;
10
11/// Used to generate VirtualNode's from a TokenStream.
12///
13/// html! { <div> Welcome to the html! procedural macro! </div> }
14#[proc_macro]
15pub fn html(input: proc_macro::TokenStream) -> proc_macro::TokenStream {
16    let parsed = parse_macro_input!(input as Html);
17
18    let mut html_parser = HtmlParser::new();
19
20    let parsed_tags_len = parsed.tags.len();
21
22    // Iterate over all of our parsed tags and push them into our HtmlParser one by one.
23    //
24    // As we go out HtmlParser will maintain some heuristics about what we've done so far
25    // since that will sometimes inform how to parse the next token.
26    for (idx, tag) in parsed.tags.iter().enumerate() {
27        let mut next_tag = None;
28
29        if parsed_tags_len - 1 > idx {
30            next_tag = Some(&parsed.tags[idx + 1])
31        }
32
33        html_parser.push_tag(tag, next_tag);
34    }
35
36    html_parser.finish().into()
37}
38
39#[derive(Debug)]
40struct Html {
41    tags: Vec<Tag>,
42}
43
44impl Parse for Html {
45    fn parse(input: ParseStream) -> Result<Self> {
46        let mut tags = Vec::new();
47
48        while !input.is_empty() {
49            let tag: Tag = input.parse()?;
50            tags.push(tag);
51        }
52
53        Ok(Html { tags })
54    }
55}
html_macro/lib.rs

html_macro/
lib.rs
