proc-quote-impl-0.3.2/Cargo.toml.orig000064400000000000000000000010701363607551600156400ustar0000000000000000[package] name = "proc-quote-impl" version = "0.3.2" authors = ["PedroGonçaloCorreia "] description = "A procedural macro implementation of quote!." license = "MIT/Apache-2.0" readme = "README.md" keywords = ["syn", "quote", "proc-macro"] categories = ["development-tools::procedural-macro-helpers"] repository = "https://github.com/Goncalerta/proc-quote" edition = "2018" [lib] proc-macro = true [dependencies] quote = { version = "1.0" } proc-macro-hack = "0.5" proc-macro2 = { version = "1.0", default-features = false } proc-quote-impl-0.3.2/Cargo.toml0000644000000021130000000000000121250ustar00# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO # # When uploading crates to the registry Cargo will automatically # "normalize" Cargo.toml files for maximal compatibility # with all versions of Cargo and also rewrite `path` dependencies # to registry (e.g. crates.io) dependencies # # If you believe there's an error in this file please file an # issue against the rust-lang/cargo repository. If you're # editing this file be aware that the upstream Cargo.toml # will likely look very different (and much more reasonable) [package] edition = "2018" name = "proc-quote-impl" version = "0.3.2" authors = ["PedroGonçaloCorreia "] description = "A procedural macro implementation of quote!." readme = "README.md" keywords = ["syn", "quote", "proc-macro"] categories = ["development-tools::procedural-macro-helpers"] license = "MIT/Apache-2.0" repository = "https://github.com/Goncalerta/proc-quote" [lib] proc-macro = true [dependencies.proc-macro-hack] version = "0.5" [dependencies.proc-macro2] version = "1.0" default-features = false [dependencies.quote] version = "1.0" proc-quote-impl-0.3.2/LICENSE-APACHE000064400000000000000000000240541363572041400146750ustar0000000000000000 Apache License Version 2.0, January 2004 http://www.apache.org/licenses/ TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 1. Definitions. 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See the License for the specific language governing permissions and limitations under the License. proc-quote-impl-0.3.2/LICENSE-MIT000064400000000000000000000020521363572041400143770ustar0000000000000000Copyright (c) 2019 Pedro Gonçalo Correia Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. proc-quote-impl-0.3.2/README.md000064400000000000000000000005431342416551000142210ustar0000000000000000Rust Quasi-Quoting ================== This crate hosts the procedural macro implementation [`proc-quote::quote!`](https://crates.io/crates/proc-quote), rather than the [the original `quote!` macro](https://github.com/dtolnay/quote), implemented with `macro_rules!`. This crate is not supposed to be used directly. Use `proc-quote` crate instead.proc-quote-impl-0.3.2/src/lib.rs000064400000000000000000000007401343547520300146510ustar0000000000000000//! This is the proc-macro part of the proc-quote crate. //! Do not use this crate directly. extern crate proc_macro; use proc_macro::TokenStream; use proc_macro_hack::proc_macro_hack; mod proc_quote; #[doc(hidden)] #[proc_macro_hack] pub fn quote(input: TokenStream) -> TokenStream { proc_quote::quote(input.into()).into() } #[doc(hidden)] #[proc_macro_hack] pub fn quote_spanned(input: TokenStream) -> TokenStream { proc_quote::quote_spanned(input.into()).into() } proc-quote-impl-0.3.2/src/proc_quote.rs000064400000000000000000000411021343675046700162710ustar0000000000000000use proc_macro2::*; use quote::{quote, quote_spanned, TokenStreamExt}; use std::collections::BTreeSet; /// Error struct for this crate. This error can be raised /// into a `TokenStream` that calls `compile_error!` with /// the given message, at the given span. struct Error { span_s: Span, span_e: Option, msg: &'static str, } impl Error { /// Creates a new Error at the given span with the given /// message. fn new(span: Span, msg: &'static str) -> Self { Self { span_s: span, span_e: None, msg, } } /// Sets the end of the span of this error. The start of /// the span is set in `Error::new`. fn end_span(mut self, span: Span) -> Self { self.span_e = Some(span); self } /// Raises into a `TokenStream` that calls `compile_error!` /// with the given message, at the given span. fn raise(self) -> TokenStream { let Error { span_s, span_e, msg, } = self; let compile_error = quote_spanned! { span_s=> compile_error!(#msg) }; quote_spanned! { span_e.unwrap_or(span_s)=> #compile_error ; } } } /// Type alias for results in this crate. type Result = std::result::Result; /// Wraps the inner content inside a block with boilerplate to create and return `__stream`. /// If `requested_span` is some, an aditional `let __span = ...;` line is added before `inner`. fn generate_quote_header(inner: TokenStream, requested_span: Option) -> TokenStream { let requested_span = if let Some(requested_span) = requested_span { quote! { let __span = #requested_span; } } else { TokenStream::new() }; quote! { { let mut __stream = ::proc_quote::__rt::TokenStream::new(); #requested_span #inner __stream } } } /// Transforms an `Ident` into code that appends the given `Ident` into `__stream`. fn parse_ident(stream: &mut TokenStream, ident: &Ident) { let ref_mut_stream = quote! { &mut __stream }; let requested_span = quote! { __span }; let span = ident.span(); let ident = ident.to_string(); stream.append_all(quote_spanned! { span=> ::proc_quote::__rt::append_ident(#ref_mut_stream, #ident, #requested_span); }); } /// Transforms a `Punct` into code that appends the given `Punct` into `__stream`. fn parse_punct(stream: &mut TokenStream, punct: &Punct) { let ref_mut_stream = quote! { &mut __stream }; let requested_span = quote! { __span }; let span = punct.span(); let spacing = punct.spacing(); let punct = punct.as_char(); let append = match spacing { Spacing::Alone => quote_spanned! { span=> ::proc_quote::__rt::append_punct(#ref_mut_stream, #punct, ::proc_quote::__rt::Spacing::Alone, #requested_span); }, Spacing::Joint => quote_spanned! { span=> ::proc_quote::__rt::append_punct(#ref_mut_stream, #punct, ::proc_quote::__rt::Spacing::Joint, #requested_span); }, }; stream.append_all(append); } /// Transforms a `Literal` into code that appends the given `Literal` into `__stream`. fn parse_literal(stream: &mut TokenStream, lit: &Literal) { let ref_mut_stream = quote! { &mut __stream }; let requested_span = quote! { __span }; let span = lit.span(); let lit_to_string = lit.to_string(); stream.append_all(quote_spanned!{ span=> ::proc_quote::__rt::append_stringified_tokens(#ref_mut_stream, #lit_to_string, #requested_span); }); } /// Logic common to `parse_group` and `parse_group_in_iterator_pattern`. fn parse_group_base( stream: &mut TokenStream, inner: TokenStream, delimiter: Delimiter, group_span: Span, ) { let ref_mut_stream = quote! { &mut __stream }; let requested_span = quote! { __span }; let delimiter = match delimiter { Delimiter::Parenthesis => quote! { ::proc_quote::__rt::Delimiter::Parenthesis }, Delimiter::Brace => quote! { ::proc_quote::__rt::Delimiter::Brace }, Delimiter::Bracket => quote! { ::proc_quote::__rt::Delimiter::Bracket }, Delimiter::None => quote! { ::proc_quote::__rt::Delimiter::None }, }; stream.append_all(quote_spanned! { group_span => ::proc_quote::__rt::append_group(#ref_mut_stream, #inner, #delimiter, #requested_span); }); } /// Transforms a `Group` into code that appends the given `Group` into `__stream`. /// /// Inside iterator patterns, use `parse_group_in_iterator_pattern`. fn parse_group(stream: &mut TokenStream, group: &Group) -> Result<()> { let mut inner = group.stream().into_iter().peekable(); let inner = parse_token_stream(&mut inner)?; let inner = generate_quote_header(inner, None); Ok(parse_group_base( stream, inner, group.delimiter(), group.span(), )) } /// Transforms a `Group` into code that appends the given `Group` into `__stream`. /// /// This function is used inside the iterator patterns, to check for iterators used /// inside. fn parse_group_in_iterator_pattern( stream: &mut TokenStream, group: &Group, iter_idents: &mut BTreeSet, ) -> Result<()> { let mut inner = group.stream().into_iter().peekable(); let inner = parse_token_stream_in_iterator_pattern(&mut inner, iter_idents)?; let inner = generate_quote_header(inner, None); Ok(parse_group_base( stream, inner, group.delimiter(), group.span(), )) } /// Helper enum for `interpolation_pattern_type`'s return type. enum InterpolationPattern { /// #ident Ident(Ident), /// #( group ) token_stream * Iterator(Group, TokenStream), /// Not an interpolation pattern None, } /// Alias for common iterator passed to the parsing functions. type InputIter = std::iter::Peekable; /// Returns the interpolation pattern type based on the content of the given /// `punct` and the rest of the `input`. /// /// Input that is part of the pattern is automatically consumed. fn interpolation_pattern_type( punct: &Punct, input: &mut InputIter, ) -> Result { match (punct.as_char(), input.peek()) { // #ident ('#', Some(TokenTree::Ident(_))) => { if let Some(TokenTree::Ident(ident)) = input.next() { Ok(InterpolationPattern::Ident(ident)) } else { panic!("guaranteed by previous match") } } // #(group) ('#', Some(TokenTree::Group(group))) if group.delimiter() == Delimiter::Parenthesis => { let inner = match input.next() { Some(TokenTree::Group(inner)) => inner, _ => panic!("guaranteed by previous match"), }; let separator = parse_separator(input, inner.span())?; Ok(InterpolationPattern::Iterator(inner, separator)) } // Not an interpolation pattern _ => Ok(InterpolationPattern::None), } } /// Interpolates the given variable, which should implement `ToTokens`. fn interpolate_to_tokens_ident(stream: &mut TokenStream, ident: &Ident) { let ref_mut_stream = quote! { &mut __stream }; let span = ident.span(); stream.append_all(quote_spanned! { span=> ::proc_quote::__rt::append_to_tokens(#ref_mut_stream, & #ident); }); } /// Interpolates the expression inside the group, which should evaluate to /// something that implements `ToTokens`. /// /// Returns the vector of idents that were called inside the iterator. fn interpolate_iterator_group( stream: &mut TokenStream, group: &Group, separator: &TokenStream, ) -> Result> { let mut iter_idents = BTreeSet::new(); let mut inner = group.stream().into_iter().peekable(); let output = parse_token_stream_in_iterator_pattern(&mut inner, &mut iter_idents)?; let mut idents = iter_idents.iter(); let first = match idents.next() { Some(first) => first, None => { return Err(Error::new( group.span(), "Expected at least one iterator inside pattern.", )); } }; let first = quote! { #first }; let idents_in_tuple = idents.fold(first, |previous, next| quote! { (#previous, #next) }); let mut idents = iter_idents.iter(); let first = match idents.next() { Some(first) => first, None => { return Err(Error::new( group.span(), "Expected at least one iterator inside pattern.", )); } }; let first_into_iter = quote_spanned!(first.span()=> #first .__proc_quote__as_repeat() ); let zip_iterators = idents .map(|ident| quote_spanned! { ident.span()=> .zip( #ident .__proc_quote__as_repeat() ) }); if separator.is_empty() { stream.append_all(quote! { { use ::proc_quote::Repeat; for #idents_in_tuple in #first_into_iter #(#zip_iterators)* { #output } } }); } else { stream.append_all(quote! { { use ::proc_quote::Repeat; for (__i, #idents_in_tuple) in #first_into_iter #(#zip_iterators)* .enumerate() { if __i > 0 { #separator } #output } } }); } Ok(iter_idents) } /// Returns true if the next tokens are jointed '=>', the pattern that separates /// the span from the template in `quote_spanned!` macro. fn is_end_span(token: &TokenTree, input: &mut InputIter) -> bool { match token { TokenTree::Punct(punct) => { if punct.as_char() == '=' && punct.spacing() == Spacing::Joint { match input.peek() { Some(TokenTree::Punct(punct)) => { punct.as_char() == '>' && punct.spacing() == Spacing::Alone } _ => false, } } else { false } } _ => false, } } /// Parses the input according to `quote!` rules. fn parse_token_stream(input: &mut InputIter) -> Result { let mut output = TokenStream::new(); while let Some(token) = input.next() { match &token { TokenTree::Group(group) => parse_group(&mut output, group)?, TokenTree::Ident(ident) => parse_ident(&mut output, ident), TokenTree::Literal(lit) => parse_literal(&mut output, lit), TokenTree::Punct(punct) => match interpolation_pattern_type(&punct, input)? { InterpolationPattern::Ident(ident) => { interpolate_to_tokens_ident(&mut output, &ident); } InterpolationPattern::Iterator(group, separator) => { interpolate_iterator_group(&mut output, &group, &separator)?; } InterpolationPattern::None => { parse_punct(&mut output, punct); } }, } } Ok(output) } /// Parses the input according to `quote!` rules inside an iterator pattern. fn parse_token_stream_in_iterator_pattern( input: &mut InputIter, iter_idents: &mut BTreeSet, ) -> Result { let mut output = TokenStream::new(); while let Some(token) = input.next() { match &token { TokenTree::Group(group) => { parse_group_in_iterator_pattern(&mut output, group, iter_idents)? } TokenTree::Ident(ident) => parse_ident(&mut output, ident), TokenTree::Literal(lit) => parse_literal(&mut output, lit), TokenTree::Punct(punct) => match interpolation_pattern_type(&punct, input)? { InterpolationPattern::Ident(ident) => { interpolate_to_tokens_ident(&mut output, &ident); iter_idents.insert(ident); } InterpolationPattern::Iterator(group, separator) => { iter_idents.append(&mut interpolate_iterator_group( &mut output, &group, &separator, )?); } InterpolationPattern::None => { parse_punct(&mut output, punct); } }, } } Ok(output) } /// Parses the input according to `quote!` rules in an iterator pattern, between /// the parenthesis and the asterisk. fn parse_separator(input: &mut InputIter, iterators_span: Span) -> Result { let mut output = TokenStream::new(); while let Some(token) = input.next() { match &token { TokenTree::Group(group) => parse_group(&mut output, group)?, TokenTree::Ident(ident) => parse_ident(&mut output, ident), TokenTree::Literal(lit) => parse_literal(&mut output, lit), TokenTree::Punct(punct) => { if punct.as_char() == '*' { // The asterisk marks the end of the iterator pattern return Ok(output); } else { match interpolation_pattern_type(&punct, input)? { InterpolationPattern::Ident(ident) => { // TODO(#1) don't allow iterator variables interpolate_to_tokens_ident(&mut output, &ident) } InterpolationPattern::Iterator(group, separator) => { let span_s = group.span(); let span_e = separator .into_iter() .last() .map(|s| s.span()) .unwrap_or(span_s); return Err(Error::new( span_s, "Iterator patterns not supported inside separators.", ) .end_span(span_e)); } InterpolationPattern::None => { parse_punct(&mut output, punct); } } } } } } Err(Error::new( iterators_span, "Iterating interpolation does not have `*` symbol.", )) } /// Parses the span given in `quote_spanned!`, before '=>'. fn parse_span(input: &mut InputIter) -> Result { let mut output = TokenStream::new(); let span_s = input.peek().map(|token| token.span()); while let Some(token) = input.next() { if is_end_span(&token, input) { let span_e = input.next().expect("guaranteed by if").span(); let span_s = span_s.expect("guaranteed inside while"); if output.is_empty() { return Err(Error::new( span_s, "No span given before `=>`. Expected `quote_spanned!{ span=> ... }`.", ) .end_span(span_e)); } else { return Ok(output); } } else { output.append(token); } } Err(Error::new( Span::call_site(), "Could not find `=>`. Expected `quote_spanned!{ span=> ... }`.", )) } pub fn quote(input: TokenStream) -> TokenStream { let mut input = input.into_iter().peekable(); let span = quote! { ::proc_quote::__rt::Span::call_site() }; match parse_token_stream(&mut input) { Ok(output) => generate_quote_header(output, Some(span)), Err(err) => return err.raise(), } } pub fn quote_spanned(input: TokenStream) -> TokenStream { let mut input = input.into_iter().peekable(); let span = match parse_span(&mut input) { Ok(span) => span, Err(err) => return err.raise(), }; match parse_token_stream(&mut input) { Ok(output) => generate_quote_header(output, Some(span)), Err(err) => return err.raise(), } } proc-quote-impl-0.3.2/.cargo_vcs_info.json0000644000000001120000000000000141240ustar00{ "git": { "sha1": "af4b164430e8b0ea7695fd3bdd13b1f5562dbd3e" } }