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use proc_macro2::TokenStream;
use quote::{
format_ident,
quote,
ToTokens,
};
use syn::{
self,
parse_macro_input,
Ident,
DeriveInput,
Attribute,
punctuated::Punctuated,
Field,
};
fn parse_title(attrs: &Vec<Attribute>) -> Result<String, &'static str> {
match attrs.iter().find_map(|a| a.parse_meta().ok()).and_then(|m| match m {
syn::Meta::List(m) if m.path.to_token_stream().to_string() == "title" => {
Some(m.nested)
},
_ => None,
}) {
Some(m) => {
if m.len() != 1 {
return Err("#[title()] needs exactly one literal string argument");
}
match m.first().unwrap() {
syn::NestedMeta::Lit(l) => {
match l {
syn::Lit::Str(l) => {
return Ok(
litrs::StringLit::parse(l.to_token_stream().to_string()).unwrap().value().to_string(),
);
},
_ => return Err("#[title()] needs exactly one literal string argument"),
}
},
_ => {
return Err("#[title()] argument must be a string literal");
},
}
},
None => return Err("Missing #[title(\"Field name\")]"),
};
}
fn build_fields_form<X>(
form_ident: &Ident,
value_type_ident: &Ident,
value_construct_ident: &TokenStream,
fields: &Punctuated<Field, X>,
// When deriving child field from from parent from, if the parent contains values
// need to take reference. Otherwise already a ref (refs in TempFrom structs).
from_need_ref: bool,
) -> TokenStream {
let mut form_fields = vec![];
let mut form_construct_fields = vec![];
let mut form_elements = vec![];
let mut form_parse = vec![];
let mut form_parse_assemble = vec![];
for f in fields {
let f_ident = f.ident.as_ref().unwrap();
let f_name = parse_title(&f.attrs).expect(&format!("Error with attributes on field {}", f_ident));
let f_type_ident = f.ty.to_token_stream();
form_fields.push(quote!{
#f_ident: Box < dyn rooting_forms:: FormState < #f_type_ident >>,
});
let from_maybe_ref;
if from_need_ref {
from_maybe_ref = quote!(&);
} else {
from_maybe_ref = quote!();
}
form_construct_fields.push(quote!{
#f_ident:< #f_type_ident >:: new_form(context, #f_name, from.map(| from | #from_maybe_ref from.#f_ident)),
});
form_elements.push(quote!{
{
let subelements = self.#f_ident.elements();
elements.extend(subelements.error.into_iter());
elements.push(rooting:: el("span").classes(&[rooting_forms::CSS_CLASS_LABEL]).text(#f_name));
elements.extend(subelements.elements);
}
});
form_parse.push(quote!{
let #f_ident = match self.#f_ident.parse() {
Ok(v) => Some(v),
Err(e) => {
errored = true;
None
}
};
});
form_parse_assemble.push(quote!{
#f_ident: #f_ident.unwrap(),
});
}
return quote!{
#[allow(non_camel_case_types)] struct #form_ident {
#(#form_fields) *
}
impl rooting_forms:: FormState < #value_type_ident > for #form_ident {
fn elements(&self) -> rooting_forms:: FormElements {
let mut elements = Vec::new();
#(#form_elements) *
//. .
return rooting_forms:: FormElements {
error: None,
elements: elements
};
}
fn parse(&self) -> Result < #value_type_ident,
() > {
let mut errored = false;
#(#form_parse) *
//. .
if errored {
return Err(());
}
return Ok(#value_construct_ident {
#(#form_parse_assemble) *
});
}
}
Box:: new(#form_ident {
#(#form_construct_fields) *
})
};
}
fn derive1(body: DeriveInput) -> TokenStream {
let t_ident = &body.ident;
match body.data {
syn::Data::Struct(s) => {
match s.fields {
syn::Fields::Named(fields) => {
let form_build =
build_fields_form(
&format_ident!("FormStateImpl"),
&t_ident,
&t_ident.to_token_stream(),
&fields.named,
true,
);
return quote!{
impl < C: 'static + Clone > rooting_forms:: FormWith < C > for #t_ident {
fn new_form(
context: &C,
field: &str,
from: Option<&Self>
) -> Box < dyn rooting_forms:: FormState < Self >> {
use rooting_forms::FormState;
use std::str::FromStr;
use wasm_bindgen::JsCast;
#form_build
}
}
};
},
syn::Fields::Unnamed(_) => panic!("Tuple structs aren't supported"),
syn::Fields::Unit => panic!("Unit structs aren't supported"),
}
},
syn::Data::Enum(e) => {
let mut build_variants = vec![];
for (i, v) in e.variants.iter().enumerate() {
let v_ident = &v.ident;
let v_name =
parse_title(&v.attrs).expect(&format!("Error with attributes on {}::{}", t_ident, v_ident));
let v_value = format!("{}", i);
let build_option = |ignore: TokenStream| -> TokenStream {
let default;
if i == 0 {
default = quote!(true);
} else {
default = quote!(false);
}
return quote!{
let option = rooting:: el("option").text(#v_name).attr("value", #v_value);
if from.map(| from | match from {
#t_ident:: #v_ident #ignore => true,
_ => false
}).unwrap_or(#default) {
option.ref_attr("selected", "selected");
}
select.ref_push(option);
};
};
let container = quote!(rooting::el("div").classes(&[rooting_forms::CSS_CLASS_SUBFORM]));
match &v.fields {
syn::Fields::Named(fields) => {
let build_option = build_option(quote!({
..
}));
let mut subform_from_fields_def = vec![];
let mut subform_from_fields_match = vec![];
let mut subform_from_fields_copy = vec![];
for f in &fields.named {
let f_ident = f.ident.as_ref().unwrap();
let f_type = f.ty.to_token_stream();
subform_from_fields_def.push(quote!{
#f_ident:& 'a #f_type,
});
subform_from_fields_match.push(quote!(#f_ident));
subform_from_fields_copy.push(quote!(#f_ident: #f_ident));
}
let subform_build =
build_fields_form(
&format_ident!("{}_{}_FormState", t_ident, v.ident),
&t_ident,
"e!(#t_ident:: #v_ident),
&fields.named,
false,
);
build_variants.push(quote!{
{
#build_option
//. .
let subform = {
struct FromTemp < 'a > {
#(#subform_from_fields_def) *
}
let from = from.and_then(| from | match from {
#t_ident:: #v_ident {
#(#subform_from_fields_match),
*
}
=> Some(FromTemp {
#(#subform_from_fields_copy),
*
}),
_ => None,
});
#subform_build
};
let subform_elements = subform.elements();
let container = #container;
if let Some(error) = subform_elements.error {
container.ref_push(error);
}
container.ref_extend(subform_elements.elements);
variant_elements.push(container);
variant_parse.push(Box::new(move || subform.parse()));
}
});
},
syn::Fields::Unnamed(fields) => {
if fields.unnamed.len() != 1 {
panic!(
"Only single field tuple enum variants are supported currently ({}::{})",
t_ident,
v_ident
);
}
let build_option = build_option(quote!((_)));
let f = fields.unnamed.first().unwrap();
let f_type_ident = f.ty.to_token_stream();
build_variants.push(quote!{
{
#build_option
//. .
let subform =< #f_type_ident >:: new_form(context, #v_name, from.and_then(| from | match from {
#t_ident:: #v_ident(from) => Some(from),
_ => None,
}));
let subform_elements = subform.elements();
let container = #container;
if let Some(error) = subform_elements.error {
container.ref_push(error);
}
container.ref_extend(subform_elements.elements);
variant_elements.push(container);
variant_parse.push(
Box:: new(move || subform.parse().map(| v | #t_ident:: #v_ident(v)))
);
}
});
},
syn::Fields::Unit => {
let build_option = build_option(quote!());
build_variants.push(quote!{
{
#build_option
//. .
variant_parse.push(Box:: new(|| Ok(#t_ident:: #v_ident)));
variant_elements.push(#container);
}
});
},
}
}
return quote!{
impl < C: 'static + Clone > rooting_forms:: FormWith < C > for #t_ident {
fn new_form(
context: &C,
field: &str,
from: Option<&Self>
) -> Box < dyn rooting_forms:: FormState < Self >> {
use rooting_forms::FormState;
use std::str::FromStr;
use wasm_bindgen::JsCast;
struct FormStateImpl {
select: rooting::El,
variant_parse: Vec < Box < dyn Fn() -> Result < #t_ident,
() >>>,
variant_elements: Vec<rooting::El>,
current_variant: std::rc::Rc<std::cell::Cell<usize>>,
}
impl rooting_forms:: FormState < #t_ident > for FormStateImpl {
fn elements(&self) -> rooting_forms::FormElements {
let mut out = vec![];
out.push(self.select.clone());
out.extend(self.variant_elements.clone());
return rooting_forms::FormElements {
error: None,
elements: out,
};
}
fn parse(&self) -> Result < #t_ident,
() > {
return self.variant_parse[self.current_variant.get()]();
}
}
let variant = std::rc::Rc::new(std::cell::Cell::new(0));
let mut elements = vec![];
let select =
rooting::el("select")
.classes(&[rooting_forms::CSS_CLASS_SMALL_INPUT])
.attr(rooting_forms::ATTR_LABEL, field);
elements.push(select.clone());
let mut variant_parse: Vec < Box < dyn Fn() -> Result < #t_ident,
() >>>
//.
= vec ![];
let mut variant_elements = vec![];
#(#build_variants) *
//. .
select.ref_on("change", {
let variant_elements = variant_elements.clone();
let variant = variant.clone();
move |event| {
let index =
usize::from_str(
&event
.target()
.unwrap()
.dyn_into::<rooting_forms::republish::HtmlSelectElement>()
.unwrap()
.value(),
).unwrap();
variant.set(index);
for (e_index, v) in variant_elements.iter().enumerate() {
v.ref_modify_classes(&[(rooting_forms::CSS_CLASS_HIDDEN, e_index != index)]);
}
}
});
for v in &variant_elements[1..] {
v.ref_classes(&[rooting_forms::CSS_CLASS_HIDDEN]);
}
return Box::new(FormStateImpl {
select: select,
variant_parse: variant_parse,
variant_elements: variant_elements,
current_variant: variant,
});
}
}
}
},
syn::Data::Union(_) => panic!("Union types unsupported"),
};
}
#[proc_macro_derive(Form, attributes(title))]
pub fn derive(body: proc_macro::TokenStream) -> proc_macro::TokenStream {
let ast = parse_macro_input!(body as syn::DeriveInput);
return derive1(ast).into();
}