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An attempt at a macro to support HTML literals

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This commit is contained in:
Eric Holk 2012-08-09 16:48:31 -07:00
parent 96fdad2fb7
commit d704fc9196
1 changed files with 68 additions and 0 deletions
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68
src/test/run-pass/html-literals.rs Normal file
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// A test of the macro system. Can we do HTML literals?
// xfail-pretty
// xfail-test
macro_rules! html {
{ $($body:tt)* } => {
let builder = HTMLBuilder();
build_html!{builder := $($body)*};
builder.getDoc()
}
}
macro_rules! build_html {
{ $builder:expr := </$tag:ident> $($rest:tt)* } => {
$builder.endTag(stringify!($tag));
build_html!{ $builder := $($rest)* };
};
{ $builder:expr := <$tag:ident> $($rest:tt)* } => {
$builder.beginTag(stringify!($tag));
build_html!{ $builder := $($rest)* };
};
{ $builder:expr := . $($rest:tt)* } => {
$builder.addText(~".");
build_html!{ $builder := $($rest)* };
};
{ $builder:expr := $word:ident $($rest:tt)* } => {
$builder.addText(stringify!($word));
build_html!{ $builder := $($rest)* };
};
{ $builder:expr := } => { }
}
fn main() {
let page = html! {
<html>
<head><title>This is the title.</title></head>
<body>
<p>This is some text</p>
</body>
</html>
};
// When we can do this, we are successful:
//
//let page = tag(~"html", ~[tag(~"head", ~[...])])
}
enum HTMLFragment {
}
struct HTMLBuilder {
bar: ();
fn getDoc() -> HTMLFragment { fail }
fn beginTag(tag: ~str) { }
fn endTag(tag: ~str) { }
fn addText(test: ~str) { }
}
fn HTMLBuilder() -> HTMLBuilder {
HTMLBuilder { bar: () }
}