267 lines
8.1 KiB
Rust
267 lines
8.1 KiB
Rust
use super::*;
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use proc_macro2::TokenStream as TokenStream2;
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use quote::{quote, ToTokens, TokenStreamExt};
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use syn::{
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ext::IdentExt,
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parse::{discouraged::Speculative, Parse, ParseBuffer, ParseStream},
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token, Error, Expr, ExprClosure, Ident, LitStr, Result, Token,
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};
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// =======================================
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// Parse the VNode::Element type
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// =======================================
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pub struct Element {
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name: Ident,
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key: Option<AttrType>,
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attributes: Vec<ElementAttr>,
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listeners: Vec<ElementAttr>,
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children: Vec<Node>,
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is_static: bool,
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}
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impl ToTokens for Element {
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fn to_tokens(&self, tokens: &mut TokenStream2) {
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let name = &self.name;
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let attr = &self.attributes;
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let childs = &self.children;
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let listeners = &self.listeners;
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tokens.append_all(quote! {
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__cx.element(
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dioxus_elements::#name,
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__cx.bump().alloc([ #(#listeners),* ]),
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__cx.bump().alloc([ #(#attr),* ]),
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__cx.bump().alloc([ #(#childs),* ]),
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None,
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)
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});
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}
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}
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impl Parse for Element {
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fn parse(stream: ParseStream) -> Result<Self> {
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let name = Ident::parse(stream)?;
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// TODO: remove this in favor of the compile-time validation system
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if !crate::util::is_valid_tag(&name.to_string()) {
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return Err(Error::new(name.span(), "Not a valid Html tag"));
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}
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// parse the guts
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let content: ParseBuffer;
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syn::braced!(content in stream);
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let mut attributes: Vec<ElementAttr> = vec![];
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let mut listeners: Vec<ElementAttr> = vec![];
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let mut children: Vec<Node> = vec![];
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let mut key = None;
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'parsing: loop {
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// [1] Break if empty
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if content.is_empty() {
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break 'parsing;
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}
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if content.peek(Ident) && content.peek2(Token![:]) && !content.peek3(Token![:]) {
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parse_element_body(
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&content,
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&mut attributes,
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&mut listeners,
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&mut key,
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name.clone(),
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)?;
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} else {
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children.push(content.parse::<Node>()?);
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}
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// consume comma if it exists
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// we don't actually care if there *are* commas after elements/text
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if content.peek(Token![,]) {
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let _ = content.parse::<Token![,]>();
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}
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}
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Ok(Self {
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key,
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name,
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attributes,
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children,
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listeners,
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is_static: false,
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})
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}
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}
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/// =======================================
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/// Parse a VElement's Attributes
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/// =======================================
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struct ElementAttr {
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element_name: Ident,
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name: Ident,
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value: AttrType,
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namespace: Option<String>,
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}
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enum AttrType {
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BumpText(LitStr),
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FieldTokens(Expr),
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EventTokens(Expr),
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Event(ExprClosure),
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}
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// We parse attributes and dump them into the attribute vec
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// This is because some tags might be namespaced (IE style)
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// These dedicated tags produce multiple name-spaced attributes
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fn parse_element_body(
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stream: ParseStream,
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attrs: &mut Vec<ElementAttr>,
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listeners: &mut Vec<ElementAttr>,
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key: &mut Option<AttrType>,
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element_name: Ident,
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) -> Result<()> {
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let mut name = Ident::parse_any(stream)?;
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let name_str = name.to_string();
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stream.parse::<Token![:]>()?;
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// Return early if the field is a listener
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if name_str.starts_with("on") {
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// remove the "on" bit
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// name = Ident::new(&name_str.trim_start_matches("on"), name.span());
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let ty = if stream.peek(token::Brace) {
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let content;
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syn::braced!(content in stream);
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// Try to parse directly as a closure
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let fork = content.fork();
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if let Ok(event) = fork.parse::<ExprClosure>() {
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content.advance_to(&fork);
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AttrType::Event(event)
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} else {
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AttrType::EventTokens(content.parse()?)
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}
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} else {
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AttrType::Event(stream.parse()?)
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};
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listeners.push(ElementAttr {
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name,
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value: ty,
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namespace: None,
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element_name: element_name.clone(),
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});
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return Ok(());
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}
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let ty: AttrType = match name_str.as_str() {
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// short circuit early if style is using the special syntax
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"style" if stream.peek(token::Brace) => {
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let inner;
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syn::braced!(inner in stream);
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while !inner.is_empty() {
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let name = Ident::parse_any(&inner)?;
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inner.parse::<Token![:]>()?;
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let ty = if inner.peek(LitStr) {
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let rawtext = inner.parse::<LitStr>().unwrap();
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AttrType::BumpText(rawtext)
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} else {
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let toks = inner.parse::<Expr>()?;
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AttrType::FieldTokens(toks)
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};
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if inner.peek(Token![,]) {
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let _ = inner.parse::<Token![,]>();
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}
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attrs.push(ElementAttr {
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name,
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value: ty,
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namespace: Some("style".to_string()),
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element_name: element_name.clone(),
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});
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}
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return Ok(());
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}
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"key" => {
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*key = Some(AttrType::BumpText(stream.parse::<LitStr>()?));
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return Ok(());
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}
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"classes" => {
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todo!("custom class lsit not supported")
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}
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"namespace" => {
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todo!("custom namespace not supported")
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}
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"ref" => {
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todo!("NodeRefs are currently not supported! This is currently a reserved keyword.")
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}
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// Fall through
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_ => {
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if stream.peek(LitStr) {
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let rawtext = stream.parse::<LitStr>().unwrap();
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AttrType::BumpText(rawtext)
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} else {
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let toks = stream.parse::<Expr>()?;
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AttrType::FieldTokens(toks)
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}
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}
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};
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// consume comma if it exists
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// we don't actually care if there *are* commas between attrs
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if stream.peek(Token![,]) {
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let _ = stream.parse::<Token![,]>();
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}
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attrs.push(ElementAttr {
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name,
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value: ty,
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namespace: None,
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element_name,
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});
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Ok(())
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}
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impl ToTokens for ElementAttr {
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fn to_tokens(&self, tokens: &mut TokenStream2) {
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let el_name = &self.element_name;
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let name_str = self.name.to_string();
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let nameident = &self.name;
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let namespace = match &self.namespace {
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Some(t) => quote! { Some(#t) },
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None => quote! { None },
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};
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match &self.value {
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AttrType::BumpText(value) => tokens.append_all(quote! {
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dioxus_elements::#el_name.#nameident(__cx, format_args_f!(#value))
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}),
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// __cx.attr(#name, format_args_f!(#value), #namespace, false)
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//
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// AttrType::BumpText(value) => tokens.append_all(quote! {
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// __cx.attr(#name, format_args_f!(#value), #namespace, false)
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// }),
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AttrType::FieldTokens(exp) => tokens.append_all(quote! {
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dioxus_elements::#el_name.#nameident(__cx, #exp)
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}),
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// __cx.attr(#name_str, #exp, #namespace, false)
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// AttrType::FieldTokens(exp) => tokens.append_all(quote! {
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// dioxus_elements::#el_name.#nameident(__cx, format_args_f!(#value))
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// __cx.attr(#name_str, #exp, #namespace, false)
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// }),
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// todo: move event handlers on to the elements or onto the nodefactory
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AttrType::Event(event) => tokens.append_all(quote! {
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dioxus::events::on::#nameident(__cx, #event)
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}),
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AttrType::EventTokens(event) => tokens.append_all(quote! {
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dioxus::events::on::#nameident(__cx, #event)
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}),
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}
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}
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}
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