239 lines
7.0 KiB
Rust
239 lines
7.0 KiB
Rust
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use proc_macro2::{Span, TokenStream};
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use quote::{quote, ToTokens};
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use std::fs;
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use std::path::{Path, PathBuf};
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use syn::parse::{Parse, ParseStream, Result as ParseResult};
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use syn::punctuated::Punctuated;
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use syn::{Fields, Ident, ItemStruct, Lifetime, LitBool, LitChar, LitStr, Token};
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use crate::compiler::Compiler;
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use crate::error::*;
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enum GenericParamName {
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Ident(Ident),
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LifeTime(Lifetime),
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}
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impl ToTokens for GenericParamName {
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fn to_tokens(&self, tokens: &mut TokenStream) {
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match self {
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GenericParamName::Ident(ref i) => i.to_tokens(tokens),
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GenericParamName::LifeTime(ref l) => l.to_tokens(tokens),
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}
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}
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}
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// arguments for include_template* macros
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#[derive(Default)]
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struct DeriveTemplateOptions {
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path: Option<LitStr>,
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delimiter: Option<LitChar>,
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escape: Option<LitBool>,
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type_: Option<LitStr>,
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}
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impl Parse for DeriveTemplateOptions {
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fn parse(outer: ParseStream) -> ParseResult<Self> {
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let s;
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syn::parenthesized!(s in outer);
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let mut options = Self::default();
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let mut found_keys = Vec::new();
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while !s.is_empty() {
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let key = s.parse::<Ident>()?;
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s.parse::<Token![=]>()?;
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// check if argument is repeated
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if found_keys.iter().any(|e| *e == key) {
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return Err(syn::Error::new(
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key.span(),
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format!("Argument `{}` was repeated.", key),
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));
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}
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if key == "path" {
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options.path = Some(s.parse::<LitStr>()?);
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} else if key == "delimiter" {
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options.delimiter = Some(s.parse::<LitChar>()?);
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} else if key == "escape" {
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options.escape = Some(s.parse::<LitBool>()?);
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} else if key == "type" {
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options.type_ = Some(s.parse::<LitStr>()?);
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} else {
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return Err(syn::Error::new(
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key.span(),
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format!("Unknown option: `{}`", key),
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));
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}
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found_keys.push(key);
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// consume comma token
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if s.is_empty() {
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break;
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} else {
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s.parse::<Token![,]>()?;
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}
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}
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Ok(options)
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}
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}
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impl DeriveTemplateOptions {
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fn merge(&mut self, other: DeriveTemplateOptions) -> Result<(), syn::Error> {
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fn merge_single<T: ToTokens>(
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lhs: &mut Option<T>,
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rhs: Option<T>,
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) -> Result<(), syn::Error> {
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if lhs.is_some() {
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if let Some(rhs) = rhs {
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Err(syn::Error::new_spanned(rhs, "keyword argument repeated."))
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} else {
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Ok(())
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}
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} else {
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*lhs = rhs;
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Ok(())
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}
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}
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merge_single(&mut self.path, other.path)?;
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merge_single(&mut self.delimiter, other.delimiter)?;
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merge_single(&mut self.escape, other.escape)?;
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merge_single(&mut self.type_, other.type_)?;
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Ok(())
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}
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}
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struct TemplateStruct {
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options: DeriveTemplateOptions,
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}
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fn compile(
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input_file: &Path,
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output_file: &Path,
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options: &DeriveTemplateOptions,
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) -> Result<(), Error> {
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let mut compiler = Compiler::new();
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if let Some(ref delimiter) = options.delimiter {
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compiler = compiler.delimiter(delimiter.value());
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}
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if let Some(ref escape) = options.escape {
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compiler = compiler.escape(escape.value);
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}
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compiler.compile_file(input_file, &*output_file)
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}
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fn derive_template_impl(tokens: TokenStream) -> Result<TokenStream, syn::Error> {
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let strct = syn::parse2::<ItemStruct>(tokens)?;
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let mut all_options = DeriveTemplateOptions::default();
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for attr in strct.attrs {
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let opt = syn::parse2::<DeriveTemplateOptions>(attr.tokens)?;
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all_options.merge(opt)?;
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}
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let input_file = match all_options.path {
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Some(ref path) => {
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let mut input = PathBuf::from(std::env::var("CARGO_MANIFEST_DIR").expect(
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"Internal error: environmental variable `CARGO_MANIFEST_DIR` is not set.",
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));
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input.push("templates");
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input.push(path.value());
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input
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}
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None => {
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return Err(syn::Error::new(
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Span::call_site(),
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"`path` option must be specified.",
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)
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.into())
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}
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};
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let filename = match input_file.file_name() {
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Some(f) => f,
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None => {
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return Err(syn::Error::new(
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Span::call_site(),
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format!("Invalid file name: {:?}", input_file),
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))
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}
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};
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let out_dir = match std::env::var("SAILFISH_OUTPUT_DIR") {
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Ok(dir) => {
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let p = PathBuf::from(dir);
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fs::create_dir_all(&*p).unwrap();
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p.canonicalize().unwrap()
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}
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Err(_) => PathBuf::from(env!("OUT_DIR")),
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};
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let mut output_file = out_dir.clone();
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output_file.push("templates");
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output_file.push(filename);
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compile(&*input_file, &*output_file, &all_options)
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.map_err(|e| syn::Error::new(Span::call_site(), e))?;
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let input_file_string = input_file.to_string_lossy();
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let output_file_string = output_file.to_string_lossy();
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// Generate tokens
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let name = strct.ident;
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let field_names: Punctuated<Ident, Token![,]> = match strct.fields {
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Fields::Named(fields) => fields
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.named
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.into_iter()
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.map(|f| {
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f.ident.expect(
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"Internal error: Failed to get field name (error code: 73621)",
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)
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})
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.collect(),
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Fields::Unit => Punctuated::new(),
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_ => {
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return Err(syn::Error::new(
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Span::call_site(),
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"You cannot derive `Template` or `TemplateOnce` for tuple struct",
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));
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}
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};
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let (impl_generics, ty_generics, where_clause) = strct.generics.split_for_impl();
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let tokens = quote! {
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impl #impl_generics sailfish::TemplateOnce for #name #ty_generics #where_clause {
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fn render_once(self) -> sailfish::runtime::RenderResult {
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include_bytes!(#input_file_string);
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use sailfish::runtime as sfrt;
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use sfrt::Render as _;
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static SIZE_HINT: sfrt::SizeHint = sfrt::SizeHint::new();
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let _size_hint = SIZE_HINT.get();
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let mut _ctx = sfrt::Context {
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buf: sfrt::Buffer::with_capacity(_size_hint)
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};
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let #name { #field_names } = self;
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include!(#output_file_string);
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SIZE_HINT.update(_ctx.buf.len());
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_ctx.into_result()
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}
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}
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};
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Ok(tokens)
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}
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pub fn derive_template(tokens: TokenStream) -> TokenStream {
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derive_template_impl(tokens).unwrap_or_else(|e| e.to_compile_error())
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}
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