diff options
Diffstat (limited to '')
| -rw-r--r-- | third_party/rust/paste-impl/.cargo-checksum.json | 1 | ||||
| -rw-r--r-- | third_party/rust/paste-impl/Cargo.toml | 36 | ||||
| -rw-r--r-- | third_party/rust/paste-impl/LICENSE-APACHE | 201 | ||||
| -rw-r--r-- | third_party/rust/paste-impl/LICENSE-MIT | 25 | ||||
| -rw-r--r-- | third_party/rust/paste-impl/src/enum_hack.rs | 61 | ||||
| -rw-r--r-- | third_party/rust/paste-impl/src/lib.rs | 248 |
6 files changed, 572 insertions, 0 deletions
diff --git a/third_party/rust/paste-impl/.cargo-checksum.json b/third_party/rust/paste-impl/.cargo-checksum.json new file mode 100644 index 0000000000..acd2f7765c --- /dev/null +++ b/third_party/rust/paste-impl/.cargo-checksum.json @@ -0,0 +1 @@ +{"files":{"Cargo.toml":"a38a5cd4f98c83b4e3da74ea12f2e9ec9839c4b344f4b13be5d13280bf38b928","LICENSE-APACHE":"a60eea817514531668d7e00765731449fe14d059d3249e0bc93b36de45f759f2","LICENSE-MIT":"7f697f191d6ffb32881a6bcf535e817ebbebaaa11b9aacf4f0b26fd32e2cc201","src/enum_hack.rs":"c01854a6921de3bb55670d0f5a359fed3d68b36db837b858cc3ed1553fc13a74","src/lib.rs":"ed045c1ac2a53e733bb6065805707d6d327edf30345f4a9a8bd5db8d7041e2ca"},"package":"2e0bf239e447e67ff6d16a8bb5e4d4bd2343acf5066061c0e8e06ac5ba8ca68c"}
\ No newline at end of file diff --git a/third_party/rust/paste-impl/Cargo.toml b/third_party/rust/paste-impl/Cargo.toml new file mode 100644 index 0000000000..5b7eaad89f --- /dev/null +++ b/third_party/rust/paste-impl/Cargo.toml @@ -0,0 +1,36 @@ +# 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 = "paste-impl" +version = "0.1.12" +authors = ["David Tolnay <dtolnay@gmail.com>"] +description = "Implementation detail of the `paste` crate" +license = "MIT OR Apache-2.0" +repository = "https://github.com/dtolnay/paste" +[package.metadata.docs.rs] +targets = ["x86_64-unknown-linux-gnu"] + +[lib] +proc-macro = true +[dependencies.proc-macro-hack] +version = "0.5" + +[dependencies.proc-macro2] +version = "1.0" + +[dependencies.quote] +version = "1.0" + +[dependencies.syn] +version = "1.0" diff --git a/third_party/rust/paste-impl/LICENSE-APACHE b/third_party/rust/paste-impl/LICENSE-APACHE new file mode 100644 index 0000000000..16fe87b06e --- /dev/null +++ b/third_party/rust/paste-impl/LICENSE-APACHE @@ -0,0 +1,201 @@ + Apache License + Version 2.0, January 2004 + http://www.apache.org/licenses/ + +TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION + +1. 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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. diff --git a/third_party/rust/paste-impl/src/enum_hack.rs b/third_party/rust/paste-impl/src/enum_hack.rs new file mode 100644 index 0000000000..626b265be5 --- /dev/null +++ b/third_party/rust/paste-impl/src/enum_hack.rs @@ -0,0 +1,61 @@ +use std::collections::hash_map::DefaultHasher; +use std::hash::{Hash, Hasher}; + +use proc_macro2::{Ident, Span, TokenStream, TokenTree}; +use quote::quote; +use syn::parse::{Parse, ParseStream, Result}; +use syn::{braced, parenthesized, parse_macro_input, Token}; + +pub fn wrap(output: TokenStream) -> TokenStream { + let mut hasher = DefaultHasher::default(); + output.to_string().hash(&mut hasher); + let mangled_name = format!("_paste_{}", hasher.finish()); + let ident = Ident::new(&mangled_name, Span::call_site()); + + quote! { + #[derive(paste::EnumHack)] + enum #ident { + Value = (stringify! { + #output + }, 0).1, + } + } +} + +struct EnumHack { + token_stream: TokenStream, +} + +impl Parse for EnumHack { + fn parse(input: ParseStream) -> Result<Self> { + input.parse::<Token![enum]>()?; + input.parse::<Ident>()?; + + let braces; + braced!(braces in input); + braces.parse::<Ident>()?; + braces.parse::<Token![=]>()?; + + let parens; + parenthesized!(parens in braces); + parens.parse::<Ident>()?; + parens.parse::<Token![!]>()?; + + let inner; + braced!(inner in parens); + let token_stream: TokenStream = inner.parse()?; + + parens.parse::<Token![,]>()?; + parens.parse::<TokenTree>()?; + braces.parse::<Token![.]>()?; + braces.parse::<TokenTree>()?; + braces.parse::<Token![,]>()?; + + Ok(EnumHack { token_stream }) + } +} + +pub fn extract(input: proc_macro::TokenStream) -> proc_macro::TokenStream { + let inner = parse_macro_input!(input as EnumHack); + proc_macro::TokenStream::from(inner.token_stream) +} diff --git a/third_party/rust/paste-impl/src/lib.rs b/third_party/rust/paste-impl/src/lib.rs new file mode 100644 index 0000000000..dce8bb07fd --- /dev/null +++ b/third_party/rust/paste-impl/src/lib.rs @@ -0,0 +1,248 @@ +extern crate proc_macro; + +mod enum_hack; + +use proc_macro2::{Delimiter, Group, Ident, Punct, Spacing, Span, TokenStream, TokenTree}; +use proc_macro_hack::proc_macro_hack; +use quote::{quote, ToTokens}; +use std::iter::FromIterator; +use syn::parse::{Error, Parse, ParseStream, Parser, Result}; +use syn::{parenthesized, parse_macro_input, Lit, LitStr, Token}; + +#[proc_macro] +pub fn item(input: proc_macro::TokenStream) -> proc_macro::TokenStream { + let input = parse_macro_input!(input as PasteInput); + proc_macro::TokenStream::from(input.expanded) +} + +#[proc_macro] +pub fn item_with_macros(input: proc_macro::TokenStream) -> proc_macro::TokenStream { + let input = parse_macro_input!(input as PasteInput); + proc_macro::TokenStream::from(enum_hack::wrap(input.expanded)) +} + +#[proc_macro_hack] +pub fn expr(input: proc_macro::TokenStream) -> proc_macro::TokenStream { + let input = parse_macro_input!(input as PasteInput); + let output = input.expanded; + proc_macro::TokenStream::from(quote!({ #output })) +} + +#[doc(hidden)] +#[proc_macro_derive(EnumHack)] +pub fn enum_hack(input: proc_macro::TokenStream) -> proc_macro::TokenStream { + enum_hack::extract(input) +} + +struct PasteInput { + expanded: TokenStream, +} + +impl Parse for PasteInput { + fn parse(input: ParseStream) -> Result<Self> { + let mut expanded = TokenStream::new(); + while !input.is_empty() { + match input.parse()? { + TokenTree::Group(group) => { + let delimiter = group.delimiter(); + let content = group.stream(); + let span = group.span(); + if delimiter == Delimiter::Bracket && is_paste_operation(&content) { + let segments = parse_bracket_as_segments.parse2(content)?; + let pasted = paste_segments(span, &segments)?; + pasted.to_tokens(&mut expanded); + } else if is_none_delimited_single_ident_or_lifetime(delimiter, &content) { + content.to_tokens(&mut expanded); + } else { + let nested = PasteInput::parse.parse2(content)?; + let mut group = Group::new(delimiter, nested.expanded); + group.set_span(span); + group.to_tokens(&mut expanded); + } + } + other => other.to_tokens(&mut expanded), + } + } + Ok(PasteInput { expanded }) + } +} + +fn is_paste_operation(input: &TokenStream) -> bool { + let input = input.clone(); + parse_bracket_as_segments.parse2(input).is_ok() +} + +// https://github.com/dtolnay/paste/issues/26 +fn is_none_delimited_single_ident_or_lifetime(delimiter: Delimiter, input: &TokenStream) -> bool { + if delimiter != Delimiter::None { + return false; + } + + #[derive(PartialEq)] + enum State { + Init, + Ident, + Apostrophe, + Lifetime, + } + + let mut state = State::Init; + for tt in input.clone() { + state = match (state, &tt) { + (State::Init, TokenTree::Ident(_)) => State::Ident, + (State::Init, TokenTree::Punct(punct)) if punct.as_char() == '\'' => State::Apostrophe, + (State::Apostrophe, TokenTree::Ident(_)) => State::Lifetime, + _ => return false, + }; + } + state == State::Ident || state == State::Lifetime +} + +enum Segment { + String(String), + Apostrophe(Span), + Env(LitStr), + Modifier(Token![:], Ident), +} + +fn parse_bracket_as_segments(input: ParseStream) -> Result<Vec<Segment>> { + input.parse::<Token![<]>()?; + + let segments = parse_segments(input)?; + + input.parse::<Token![>]>()?; + if !input.is_empty() { + return Err(input.error("invalid input")); + } + Ok(segments) +} + +fn parse_segments(input: ParseStream) -> Result<Vec<Segment>> { + let mut segments = Vec::new(); + while !(input.is_empty() || input.peek(Token![>])) { + match input.parse()? { + TokenTree::Ident(ident) => { + let mut fragment = ident.to_string(); + if fragment.starts_with("r#") { + fragment = fragment.split_off(2); + } + if fragment == "env" && input.peek(Token![!]) { + input.parse::<Token![!]>()?; + let arg; + parenthesized!(arg in input); + let var: LitStr = arg.parse()?; + segments.push(Segment::Env(var)); + } else { + segments.push(Segment::String(fragment)); + } + } + TokenTree::Literal(lit) => { + let value = match syn::parse_str(&lit.to_string())? { + Lit::Str(string) => string.value().replace('-', "_"), + Lit::Int(_) => lit.to_string(), + _ => return Err(Error::new(lit.span(), "unsupported literal")), + }; + segments.push(Segment::String(value)); + } + TokenTree::Punct(punct) => match punct.as_char() { + '_' => segments.push(Segment::String("_".to_string())), + '\'' => segments.push(Segment::Apostrophe(punct.span())), + ':' => segments.push(Segment::Modifier(Token), input.parse()?)), + _ => return Err(Error::new(punct.span(), "unexpected punct")), + }, + TokenTree::Group(group) => { + if group.delimiter() == Delimiter::None { + let nested = parse_segments.parse2(group.stream())?; + segments.extend(nested); + } else { + return Err(Error::new(group.span(), "unexpected token")); + } + } + } + } + Ok(segments) +} + +fn paste_segments(span: Span, segments: &[Segment]) -> Result<TokenStream> { + let mut evaluated = Vec::new(); + let mut is_lifetime = false; + + for segment in segments { + match segment { + Segment::String(segment) => { + evaluated.push(segment.clone()); + } + Segment::Apostrophe(span) => { + if is_lifetime { + return Err(Error::new(*span, "unexpected lifetime")); + } + is_lifetime = true; + } + Segment::Env(var) => { + let resolved = match std::env::var(var.value()) { + Ok(resolved) => resolved, + Err(_) => { + return Err(Error::new(var.span(), "no such env var")); + } + }; + let resolved = resolved.replace('-', "_"); + evaluated.push(resolved); + } + Segment::Modifier(colon, ident) => { + let span = quote!(#colon #ident); + let last = match evaluated.pop() { + Some(last) => last, + None => return Err(Error::new_spanned(span, "unexpected modifier")), + }; + if ident == "lower" { + evaluated.push(last.to_lowercase()); + } else if ident == "upper" { + evaluated.push(last.to_uppercase()); + } else if ident == "snake" { + let mut acc = String::new(); + let mut prev = '_'; + for ch in last.chars() { + if ch.is_uppercase() && prev != '_' { + acc.push('_'); + } + acc.push(ch); + prev = ch; + } + evaluated.push(acc.to_lowercase()); + } else if ident == "camel" { + let mut acc = String::new(); + let mut prev = '_'; + for ch in last.chars() { + if ch != '_' { + if prev == '_' { + for chu in ch.to_uppercase() { + acc.push(chu); + } + } else if prev.is_uppercase() { + for chl in ch.to_lowercase() { + acc.push(chl); + } + } else { + acc.push(ch); + } + } + prev = ch; + } + evaluated.push(acc); + } else { + return Err(Error::new_spanned(span, "unsupported modifier")); + } + } + } + } + + let pasted = evaluated.into_iter().collect::<String>(); + let ident = TokenTree::Ident(Ident::new(&pasted, span)); + let tokens = if is_lifetime { + let apostrophe = TokenTree::Punct(Punct::new('\'', Spacing::Joint)); + vec![apostrophe, ident] + } else { + vec![ident] + }; + Ok(TokenStream::from_iter(tokens)) +} |