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| author | Albert Larsan <74931857+albertlarsan68@users.noreply.github.com> | 2023-01-05 09:13:28 +0100 |
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| committer | Albert Larsan <74931857+albertlarsan68@users.noreply.github.com> | 2023-01-11 09:32:08 +0000 |
| commit | cf2dff2b1e3fa55fa5415d524200070d0d7aacfe (patch) | |
| tree | 40a88d9a46aaf3e8870676eb2538378b75a263eb /tests/ui/macros/html-literals.rs | |
| parent | ca855e6e42787ecd062d81d53336fe6788ef51a9 (diff) | |
| download | rust-cf2dff2b1e3fa55fa5415d524200070d0d7aacfe.tar.gz rust-cf2dff2b1e3fa55fa5415d524200070d0d7aacfe.zip | |
Move /src/test to /tests
Diffstat (limited to 'tests/ui/macros/html-literals.rs')
| -rw-r--r-- | tests/ui/macros/html-literals.rs | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/tests/ui/macros/html-literals.rs b/tests/ui/macros/html-literals.rs new file mode 100644 index 00000000000..26f00fed9c4 --- /dev/null +++ b/tests/ui/macros/html-literals.rs @@ -0,0 +1,95 @@ +// run-pass + +#![allow(non_camel_case_types)] +// A test of the macro system. Can we do HTML literals? + +/* + +This is an HTML parser written as a macro. It's all CPS, and we have +to carry around a bunch of state. The arguments to macros all look like this: + +{ tag_stack* # expr* # tokens } + +The stack keeps track of where we are in the tree. The expr is a list +of children of the current node. The tokens are everything that's +left. + +*/ +use HTMLFragment::{tag, text}; + +macro_rules! html { + ( $($body:tt)* ) => ( + parse_node!( []; []; $($body)* ) + ) +} + +macro_rules! parse_node { + ( + [:$head:ident ($(:$head_nodes:expr),*) + $(:$tags:ident ($(:$tag_nodes:expr),*))*]; + [$(:$nodes:expr),*]; + </$tag:ident> $($rest:tt)* + ) => ( + parse_node!( + [$(: $tags ($(:$tag_nodes),*))*]; + [$(:$head_nodes,)* :tag(stringify!($head).to_string(), + vec![$($nodes),*])]; + $($rest)* + ) + ); + + ( + [$(:$tags:ident ($(:$tag_nodes:expr),*) )*]; + [$(:$nodes:expr),*]; + <$tag:ident> $($rest:tt)* + ) => ( + parse_node!( + [:$tag ($(:$nodes)*) $(: $tags ($(:$tag_nodes),*) )*]; + []; + $($rest)* + ) + ); + + ( + [$(:$tags:ident ($(:$tag_nodes:expr),*) )*]; + [$(:$nodes:expr),*]; + . $($rest:tt)* + ) => ( + parse_node!( + [$(: $tags ($(:$tag_nodes),*))*]; + [$(:$nodes,)* :text(".".to_string())]; + $($rest)* + ) + ); + + ( + [$(:$tags:ident ($(:$tag_nodes:expr),*) )*]; + [$(:$nodes:expr),*]; + $word:ident $($rest:tt)* + ) => ( + parse_node!( + [$(: $tags ($(:$tag_nodes),*))*]; + [$(:$nodes,)* :text(stringify!($word).to_string())]; + $($rest)* + ) + ); + + ( []; [:$e:expr]; ) => ( $e ); +} + +pub fn main() { + let _page = html! ( + <html> + <head><title>This is the title.</title></head> + <body> + <p>This is some text</p> + </body> + </html> + ); +} + +#[allow(unused_tuple_struct_fields)] +enum HTMLFragment { + tag(String, Vec<HTMLFragment> ), + text(String), +} |