aboutsummaryrefslogtreecommitdiff
path: root/syn/src/ident.rs
diff options
context:
space:
mode:
authorRobin Krahl <robin.krahl@ireas.org>2020-01-07 11:18:04 +0000
committerDaniel Mueller <deso@posteo.net>2020-01-08 09:20:25 -0800
commit5e20a29b4fdc8a2d442d1093681b396dcb4b816b (patch)
tree55ab083fa8999d2ccbb5e921c1ffe52560dca152 /syn/src/ident.rs
parent203e691f46d591a2cc8acdfd850fa9f5b0fb8a98 (diff)
downloadnitrocli-5e20a29b4fdc8a2d442d1093681b396dcb4b816b.tar.gz
nitrocli-5e20a29b4fdc8a2d442d1093681b396dcb4b816b.tar.bz2
Add structopt dependency in version 0.3.7
This patch series replaces argparse with structopt in the argument handling code. As a first step, we need structopt as a dependency. Import subrepo structopt/:structopt at efbdda4753592e27bc430fb01f7b9650b2f3174d Import subrepo bitflags/:bitflags at 30668016aca6bd3b02c766e8347e0b4080d4c296 Import subrepo clap/:clap at 784524f7eb193e35f81082cc69454c8c21b948f7 Import subrepo heck/:heck at 093d56fbf001e1506e56dbfa38631d99b1066df1 Import subrepo proc-macro-error/:proc-macro-error at 6c4cfe79a622c5de8ae68557993542be46eacae2 Import subrepo proc-macro2/:proc-macro2 at d5d48eddca4566e5438e8a2cbed4a74e049544de Import subrepo quote/:quote at 727436c6c137b20f0f34dde5d8fda2679b9747ad Import subrepo rustversion/:rustversion at 0c5663313516263059ce9059ef81fc7a1cf655ca Import subrepo syn-mid/:syn-mid at 5d3d85414a9e6674e1857ec22a87b96e04a6851a Import subrepo syn/:syn at e87c27e87f6f4ef8919d0372bdb056d53ef0d8f3 Import subrepo textwrap/:textwrap at abcd618beae3f74841032aa5b53c1086b0a57ca2 Import subrepo unicode-segmentation/:unicode-segmentation at 637c9874c4fe0c205ff27787faf150a40295c6c3 Import subrepo unicode-width/:unicode-width at 3033826f8bf05e82724140a981d5941e48fce393 Import subrepo unicode-xid/:unicode-xid at 4baae9fffb156ba229665b972a9cd5991787ceb7
Diffstat (limited to 'syn/src/ident.rs')
-rw-r--r--syn/src/ident.rs101
1 files changed, 101 insertions, 0 deletions
diff --git a/syn/src/ident.rs b/syn/src/ident.rs
new file mode 100644
index 0000000..4ca7484
--- /dev/null
+++ b/syn/src/ident.rs
@@ -0,0 +1,101 @@
+#[cfg(feature = "parsing")]
+use crate::buffer::Cursor;
+#[cfg(feature = "parsing")]
+use crate::lookahead;
+#[cfg(feature = "parsing")]
+use crate::parse::{Parse, ParseStream, Result};
+#[cfg(feature = "parsing")]
+use crate::token::Token;
+use unicode_xid::UnicodeXID;
+
+pub use proc_macro2::Ident;
+
+#[cfg(feature = "parsing")]
+#[doc(hidden)]
+#[allow(non_snake_case)]
+pub fn Ident(marker: lookahead::TokenMarker) -> Ident {
+ match marker {}
+}
+
+#[cfg(feature = "parsing")]
+fn accept_as_ident(ident: &Ident) -> bool {
+ match ident.to_string().as_str() {
+ "_" |
+ // Based on https://doc.rust-lang.org/grammar.html#keywords
+ // and https://github.com/rust-lang/rfcs/blob/master/text/2421-unreservations-2018.md
+ // and https://github.com/rust-lang/rfcs/blob/master/text/2420-unreserve-proc.md
+ "abstract" | "as" | "become" | "box" | "break" | "const" | "continue" |
+ "crate" | "do" | "else" | "enum" | "extern" | "false" | "final" | "fn" |
+ "for" | "if" | "impl" | "in" | "let" | "loop" | "macro" | "match" |
+ "mod" | "move" | "mut" | "override" | "priv" | "pub" | "ref" |
+ "return" | "Self" | "self" | "static" | "struct" | "super" | "trait" |
+ "true" | "type" | "typeof" | "unsafe" | "unsized" | "use" | "virtual" |
+ "where" | "while" | "yield" => false,
+ _ => true,
+ }
+}
+
+#[cfg(feature = "parsing")]
+impl Parse for Ident {
+ fn parse(input: ParseStream) -> Result<Self> {
+ input.step(|cursor| {
+ if let Some((ident, rest)) = cursor.ident() {
+ if accept_as_ident(&ident) {
+ return Ok((ident, rest));
+ }
+ }
+ Err(cursor.error("expected identifier"))
+ })
+ }
+}
+
+#[cfg(feature = "parsing")]
+impl Token for Ident {
+ fn peek(cursor: Cursor) -> bool {
+ if let Some((ident, _rest)) = cursor.ident() {
+ accept_as_ident(&ident)
+ } else {
+ false
+ }
+ }
+
+ fn display() -> &'static str {
+ "identifier"
+ }
+}
+
+macro_rules! ident_from_token {
+ ($token:ident) => {
+ impl From<Token![$token]> for Ident {
+ fn from(token: Token![$token]) -> Ident {
+ Ident::new(stringify!($token), token.span)
+ }
+ }
+ };
+}
+
+ident_from_token!(self);
+ident_from_token!(Self);
+ident_from_token!(super);
+ident_from_token!(crate);
+ident_from_token!(extern);
+
+impl From<Token![_]> for Ident {
+ fn from(token: Token![_]) -> Ident {
+ Ident::new("_", token.span)
+ }
+}
+
+pub fn xid_ok(symbol: &str) -> bool {
+ let mut chars = symbol.chars();
+ let first = chars.next().unwrap();
+ if !(UnicodeXID::is_xid_start(first) || first == '_') {
+ return false;
+ }
+ for ch in chars {
+ if !UnicodeXID::is_xid_continue(ch) {
+ return false;
+ }
+ }
+ true
+}