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extern crate proc_macro;
use unsynn::*;
use quote::quote;
unsynn! {
struct MorxBlock(Vec<Either<MorxNode, MorxChild, Literal>>);
struct MorxNode(Cons<Ident, Either<
NodeSeparator,
MorxChildren,
MorxChild,
Cons<MorxAttrs, Either<MorxChildren, NodeSeparator>>,
>>);
struct NodeSeparator(Either<EndOfStream, Semicolon>);
struct MorxAttrs(Vec<MorxAttr>);
struct MorxAttr(Cons<Ident, Optional<Cons<PunctAny<'='>, MorxAttrValue>>>);
struct MorxAttrValue(Either<Literal, Ident, BraceGroup>);
struct MorxChildren(Cons<BraceGroupContaining<MorxBlock>, Optional<NodeSeparator>>);
struct MorxChild(Cons<PunctAny<'='>, Either<Literal, BraceGroup, EndOfStream>, Optional<NodeSeparator>>);
}
#[proc_macro]
pub fn morx(input: proc_macro::TokenStream) -> proc_macro::TokenStream {
let tokens = unsynn::TokenStream::from(input);
let ast = tokens.to_token_iter().parse_all::<MorxBlock>().expect("syntax error");
generate_block(&ast).into()
}
fn generate_block(ast: &MorxBlock) -> unsynn::TokenStream {
let children: Vec<unsynn::TokenStream> = ast.0.iter().map(|child| {
match child {
Either::First(node) => generate_node(node),
Either::Second(child_expression) => generate_expr_node(&child_expression.0.second),
Either::Third(literal) => generate_literal(literal),
_ => unreachable!("Invalid morx block AST"),
}
}).collect();
quote! {
vec! [
#(#children),*
]
}.into()
}
fn generate_node(ast: &MorxNode) -> unsynn::TokenStream {
let elem_name = ast.0.first.to_string();
let attrs_or_props = match &ast.0.second {
Either::Fourth(cons) => {
let attrs = &cons.first;
attrs.0.iter().map(|attr| {
let attr_name = attr.0.first.clone();
let attr_value = attr.0.second.0.iter().next().map(|val_expr| {
val_expr.value.second.0.clone()
});
(attr_name, attr_value)
}).collect()
},
_ => Vec::new(),
};
let elem_attrs = attrs_or_props.iter().map(|attr| {
let name = Literal::string(&attr.0.to_string()).into_token_stream();
let value = match &attr.1 {
Some(Either::First(literal)) => quote!{ format!("{}", #literal) },
Some(Either::Second(ident)) => quote!{ format!("{}", #ident) },
Some(Either::Third(bracegroup)) => bracegroup.0.stream(),
Some(Either::Fourth(_invalid)) => unreachable!("Invalid element attribute type"),
None => quote!{ String::new() },
};
quote! { (#name.to_string(), #value) }
});
let elem_props = attrs_or_props.iter().map(|attr| {
let name = &attr.0;
let value = match &attr.1 {
Some(Either::First(literal)) => quote!{ format!("{}", #literal) },
Some(Either::Second(ident)) => quote!{ #ident },
Some(Either::Third(bracegroup)) => bracegroup.0.stream(),
Some(Either::Fourth(_invalid)) => unreachable!("Invalid element attribute type"),
None => quote!{ true },
};
quote! { #name: #value }
});
let children = match &ast.0.second {
Either::Second(children) => generate_block(&children.0.first.content),
Either::Third(single_child) => {
let node = generate_expr_node(&single_child.0.second);
quote!{ vec![ #node ] }
},
Either::Fourth(Cons {first: _, second: Either::First(children), third: _, fourth: _}) => generate_block(&children.0.first.content),
_ => quote!{ vec![] }
};
let is_component_node = elem_name.chars().next().map_or(false, |char| char.is_uppercase());
if is_component_node {
quote! {
RenderNode::Component(
Box::new(#elem_name {
#(#elem_props),*
children: #children
})
)
}.into()
} else {
let elem_name = Literal::string(&elem_name).into_token_stream();
quote! {
RenderNode::Element {
name: #elem_name.to_string(),
children: #children,
attributes: std::collections::HashMap::from([#(#elem_attrs),*])
}
}.into()
}
}
// This is the ={something} expression as a child of a node
fn generate_expr_node(ast: &Either<Literal, BraceGroup, EndOfStream>) -> unsynn::TokenStream {
match ast {
Either::First(literal) => generate_literal(&literal),
Either::Second(brace_expr) => {
let children = brace_expr.0.stream();
quote! {
RenderNode::Fragment { children: #children }
}
},
_ => unreachable!("Invalid expr node"),
}
}
fn generate_literal(ast: &Literal) -> unsynn::TokenStream {
quote! {
RenderNode::TextNode { content: format!("{}", #ast) }
}
}
|
