diff options
author | Jason Macnak <natsu@google.com> | 2020-03-19 21:13:33 +0000 |
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committer | Jason Macnak <natsu@google.com> | 2020-04-06 10:42:34 -0700 |
commit | a1b325846b1eb3f6de63cf424d5399faf83693bd (patch) | |
tree | f1cad0ddd3c53022e0b298d6a93f647b087fbc5a | |
parent | ea945c67837133d236ba99b81e0dc3906ac5819a (diff) | |
download | paste-impl-a1b325846b1eb3f6de63cf424d5399faf83693bd.tar.gz |
Import 'paste-impl' rust crate version 0.1.8
Bug: b/151760391
Test: m crosvm.experimental
Change-Id: I032151bd9df1e5a61ed482070161bfece5fdea8e
-rw-r--r-- | .cargo_vcs_info.json | 5 | ||||
-rw-r--r-- | Android.bp | 23 | ||||
-rw-r--r-- | Cargo.toml | 38 | ||||
-rw-r--r-- | Cargo.toml.orig | 23 | ||||
l--------- | LICENSE | 1 | ||||
-rw-r--r-- | LICENSE-APACHE | 201 | ||||
-rw-r--r-- | LICENSE-MIT | 25 | ||||
-rw-r--r-- | METADATA | 17 | ||||
-rw-r--r-- | MODULE_LICENSE_APACHE2 | 0 | ||||
l--------- | NOTICE | 1 | ||||
-rw-r--r-- | src/enum_hack.rs | 61 | ||||
-rw-r--r-- | src/lib.rs | 200 |
12 files changed, 595 insertions, 0 deletions
diff --git a/.cargo_vcs_info.json b/.cargo_vcs_info.json new file mode 100644 index 0000000..984f7e4 --- /dev/null +++ b/.cargo_vcs_info.json @@ -0,0 +1,5 @@ +{ + "git": { + "sha1": "68b6baab911f1fdf9d3ab1d3b3ab08b73b28d21a" + } +} diff --git a/Android.bp b/Android.bp new file mode 100644 index 0000000..c519e1f --- /dev/null +++ b/Android.bp @@ -0,0 +1,23 @@ +// This file is generated by cargo2android.py. + +rust_proc_macro { + name: "libpaste_impl", + crate_name: "paste_impl", + srcs: ["src/lib.rs"], + edition: "2018", + rlibs: [ + "libproc_macro2", + "libquote", + "libsyn", + ], + proc_macros: [ + "libproc_macro_hack", + ], +} + +// dependent_library ["feature_list"] +// proc-macro-hack-0.5.12 +// proc-macro2-1.0.9 "default,proc-macro" +// quote-1.0.3 "default,proc-macro" +// syn-1.0.16 "clone-impls,default,derive,parsing,printing,proc-macro,quote" +// unicode-xid-0.2.0 "default" diff --git a/Cargo.toml b/Cargo.toml new file mode 100644 index 0000000..91725d4 --- /dev/null +++ b/Cargo.toml @@ -0,0 +1,38 @@ +# 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 = "0.1.8" +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" +[badges.travis-ci] +repository = "dtolnay/paste" diff --git a/Cargo.toml.orig b/Cargo.toml.orig new file mode 100644 index 0000000..8082791 --- /dev/null +++ b/Cargo.toml.orig @@ -0,0 +1,23 @@ +[package] +name = "paste-impl" +version = "0.1.8" +authors = ["David Tolnay <dtolnay@gmail.com>"] +edition = "2018" +license = "MIT OR Apache-2.0" +description = "Implementation detail of the `paste` crate" +repository = "https://github.com/dtolnay/paste" + +[lib] +proc-macro = true + +[badges] +travis-ci = { repository = "dtolnay/paste" } + +[dependencies] +proc-macro-hack = "0.5" +proc-macro2 = "1.0" +quote = "1.0" +syn = "1.0" + +[package.metadata.docs.rs] +targets = ["x86_64-unknown-linux-gnu"] @@ -0,0 +1 @@ +LICENSE-APACHE
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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/METADATA b/METADATA new file mode 100644 index 0000000..c28d4fe --- /dev/null +++ b/METADATA @@ -0,0 +1,17 @@ +name: "paste-impl" +description: + "Implementation detail of the `paste` crate" + +third_party { + url { + type: HOMEPAGE + value: "https://crates.io/crates/paste-impl" + } + url { + type: GIT + value: "https://github.com/dtolnay/paste" + } + version: "0.1.8" + last_upgrade_date { year: 2020 month: 3 day: 19 } + license_type: NOTICE +} diff --git a/MODULE_LICENSE_APACHE2 b/MODULE_LICENSE_APACHE2 new file mode 100644 index 0000000..e69de29 --- /dev/null +++ b/MODULE_LICENSE_APACHE2 @@ -0,0 +1 @@ +LICENSE
\ No newline at end of file diff --git a/src/enum_hack.rs b/src/enum_hack.rs new file mode 100644 index 0000000..626b265 --- /dev/null +++ b/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/src/lib.rs b/src/lib.rs new file mode 100644 index 0000000..97190d6 --- /dev/null +++ b/src/lib.rs @@ -0,0 +1,200 @@ +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 delimiter == Delimiter::None && is_single_ident(&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() +} + +fn is_single_ident(input: &TokenStream) -> bool { + let mut has_ident = false; + for tt in input.clone() { + match tt { + TokenTree::Ident(_) if !has_ident => has_ident = true, + _ => return false, + } + } + has_ident +} + +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![:](punct.span()), 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 { + 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)) +} |