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|
use quote::format_ident;
use syn::{
Expr, Ident, LitStr, Token, Type,
parse::{Parse, ParseStream},
};
use crate::form::{ParsedChild, ParsedInput, ParsedOnSubmit};
macro_rules! parse_key_value {
($input:expr, $name:ident as $ty:ty) => {{
let key = $input.parse::<Ident>()?;
$input.parse::<Token![=]>()?;
let value = $input.parse::<$ty>()?;
if key != format_ident!(stringify!($name)) {
panic!("Expected key name to be {}, but found: {key}", stringify!($name));
}
if $input.peek(Token![,]) {
$input.parse::<Token![,]>()?;
}
value
}};
(@option $input:expr, $name:ident as $ty:ty) => {{
if $input.peek(Ident) {
Some(parse_key_value!($input, $name as $ty))
} else {
None
}
}};
}
impl Parse for ParsedInput {
fn parse(input: ParseStream) -> syn::Result<Self> {
let on_submit = input.parse::<syn::Ident>()?;
if on_submit != format_ident!("on_submit") {
panic!("Did not find correct `on_submit`: {on_submit}")
}
input.parse::<Token![=]>()?;
let on_submit = input.parse::<ParsedOnSubmit>()?;
let mut children = Vec::new();
while !input.is_empty() {
children.push(input.parse::<ParsedChild>()?);
}
Ok(Self {
on_submit,
children,
})
}
}
impl Parse for ParsedChild {
fn parse(input: ParseStream) -> syn::Result<Self> {
input.parse::<Token![<]>()?;
let variant = input.parse::<Ident>()?;
let output = match variant {
variant if variant == format_ident!("Input") => {
let name = parse_key_value!(input, name as Ident);
let rust_type = parse_key_value!(input, rust_type as Type);
let html_type = parse_key_value!(input, html_type as LitStr);
let label = parse_key_value!(input, label as LitStr);
let reactive = parse_key_value!(@option input, reactive as Ident);
let auto_complete = parse_key_value!(@option input, auto_complete as Ident);
if auto_complete.is_some() && reactive.is_none() {
panic!("Cannot provide an autocomplet, without registering an reactive signal")
}
input.parse::<Token![/]>()?;
input.parse::<Token![>]>()?;
ParsedChild::Input {
name,
rust_type,
html_type,
label,
reactive,
auto_complete,
}
}
variant if variant == format_ident!("Textarea") => {
let name = parse_key_value!(input, name as Ident);
let label = parse_key_value!(input, label as LitStr);
input.parse::<Token![/]>()?;
input.parse::<Token![>]>()?;
ParsedChild::Textarea { name, label }
}
variant if variant == format_ident!("Select") => {
let name = parse_key_value!(input, name as Ident);
let rust_type = parse_key_value!(input, rust_type as Type);
let label = parse_key_value!(input, label as LitStr);
let options = parse_key_value!(input, options as Expr);
input.parse::<Token![/]>()?;
input.parse::<Token![>]>()?;
ParsedChild::Select {
name,
label,
options,
rust_type,
}
}
variant if variant == format_ident!("Show") => {
let when = parse_key_value!(input, when as Expr);
input.parse::<Token![>]>()?;
let children = {
let mut children = vec![];
while !(input.peek(Token![<]) && input.peek2(Token![/])) {
children.push(input.parse::<ParsedChild>()?);
}
{
input.parse::<Token![<]>()?;
input.parse::<Token![/]>()?;
let show_ident = input.parse::<Ident>()?;
if show_ident != format_ident!("Show") {
panic!("Expected key name to be 'Show', but found: '{show_ident}'",);
}
input.parse::<Token![>]>()?;
children
}
};
ParsedChild::Show { when, children }
}
variant if variant == format_ident!("Checkbox") => {
let name = parse_key_value!(input, name as Ident);
let label = parse_key_value!(input, label as LitStr);
input.parse::<Token![/]>()?;
input.parse::<Token![>]>()?;
ParsedChild::Checkbox { name, label }
}
_ => panic!("Unknown form child variant: {variant}"),
};
Ok(output)
}
}
impl Parse for ParsedOnSubmit {
fn parse(input: ParseStream) -> syn::Result<Self> {
let mut inputs = Vec::new();
let should_use_move = if input.peek(Token![move]) {
input.parse::<Token![move]>()?;
true
} else {
false
};
input.parse::<Token![|]>()?;
while !input.peek(Token![|]) {
inputs.push(input.parse::<Ident>()?);
if input.peek(Token![,]) {
input.parse::<Token![,]>()?;
}
}
input.parse::<Token![|]>()?;
let block = input.parse::<Expr>()?;
input.parse::<Token![;]>()?;
Ok(Self {
inputs,
block,
should_use_move,
})
}
}
|
