88af3e7eff
Hotreload the contents of for loops, if chains, component bodies, props, attributes, and any literals discovered in rsx! Add a TUI renderer to the CLI. Improve the CLI build system to be async and parallel. Refactor RSX to allow partial expansion of expressions. Merge autofmt implementations for consistency. Merge the representation of elements and components under the hood. Add a diagnostics system for rsx for improved error messages. Drop interprocess and move to websockets for communication between the CLI and the server. Assign IDs to nodes and attributes in a stable way to be used in non compiler contexts. Add hotreloading to any body of component/for loop/if chain/etc. --------- Co-authored-by: Evan Almloff <evanalmloff@gmail.com> Co-authored-by: Liam Mitchell <liamkarlmitchell@gmail.com>
87 lines
2.5 KiB
Rust
87 lines
2.5 KiB
Rust
use proc_macro2::TokenStream as TokenStream2;
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use quote::ToTokens;
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use std::hash;
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use syn::{parse::Parse, spanned::Spanned, token::Brace, Expr};
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/// A raw expression potentially wrapped in curly braces that is parsed from the input stream.
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///
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/// If there are no braces, it tries to parse as an expression without partial expansion. If there
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/// are braces, it parses the contents as a `TokenStream2` and stores it as such.
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#[derive(Clone, Debug)]
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pub struct PartialExpr {
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pub brace: Option<Brace>,
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pub expr: TokenStream2,
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}
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impl Parse for PartialExpr {
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fn parse(input: syn::parse::ParseStream) -> syn::Result<Self> {
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// Parse as an expression if there is no brace
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if !input.peek(syn::token::Brace) {
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let expr = input.parse::<syn::Expr>()?;
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return Ok(Self {
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brace: None,
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expr: expr.to_token_stream(),
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});
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}
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let content;
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let brace = Some(syn::braced!(content in input));
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let expr: TokenStream2 = content.parse()?;
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Ok(Self { brace, expr })
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}
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}
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impl ToTokens for PartialExpr {
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fn to_tokens(&self, tokens: &mut TokenStream2) {
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match &self.brace {
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Some(brace) => brace.surround(tokens, |tokens| self.expr.to_tokens(tokens)),
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_ => self.expr.to_tokens(tokens),
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}
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}
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}
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impl PartialExpr {
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pub fn as_expr(&self) -> syn::Result<syn::Expr> {
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// very important: make sure to include the brace in the span of the expr
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// otherwise autofmt will freak out since it will use the inner span
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if let Some(brace) = &self.brace {
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let mut tokens = TokenStream2::new();
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let f = |tokens: &mut TokenStream2| self.expr.to_tokens(tokens);
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brace.surround(&mut tokens, f);
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return syn::parse2(tokens);
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}
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let expr = self.expr.clone();
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syn::parse2(expr.to_token_stream())
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}
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pub fn from_expr(expr: &Expr) -> Self {
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Self {
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brace: None,
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expr: expr.to_token_stream(),
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}
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}
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pub fn span(&self) -> proc_macro2::Span {
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if let Some(brace) = &self.brace {
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brace.span.span()
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} else {
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self.expr.span()
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}
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}
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}
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impl PartialEq for PartialExpr {
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fn eq(&self, other: &Self) -> bool {
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self.expr.to_string() == other.expr.to_string()
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}
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}
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impl Eq for PartialExpr {}
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impl hash::Hash for PartialExpr {
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fn hash<H: hash::Hasher>(&self, state: &mut H) {
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self.expr.to_string().hash(state);
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}
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}
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