From 5e20a29b4fdc8a2d442d1093681b396dcb4b816b Mon Sep 17 00:00:00 2001
From: Robin Krahl <robin.krahl@ireas.org>
Date: Tue, 7 Jan 2020 11:18:04 +0000
Subject: 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
---
 syn-mid/src/arg.rs | 99 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 99 insertions(+)
 create mode 100644 syn-mid/src/arg.rs

(limited to 'syn-mid/src/arg.rs')

diff --git a/syn-mid/src/arg.rs b/syn-mid/src/arg.rs
new file mode 100644
index 0000000..593a1ac
--- /dev/null
+++ b/syn-mid/src/arg.rs
@@ -0,0 +1,99 @@
+use syn::{Attribute, Lifetime, Token};
+
+use super::PatType;
+
+ast_enum_of_structs! {
+    /// An argument in a function signature: the `n: usize` in `fn f(n: usize)`.
+    pub enum FnArg {
+        /// The `self` argument of an associated method, whether taken by value
+        /// or by reference.
+        Receiver(Receiver),
+
+        /// A function argument accepted by pattern and type.
+        Typed(PatType),
+    }
+}
+
+ast_struct! {
+    /// The `self` argument of an associated method, whether taken by value
+    /// or by reference.
+    pub struct Receiver {
+        pub attrs: Vec<Attribute>,
+        pub reference: Option<(Token![&], Option<Lifetime>)>,
+        pub mutability: Option<Token![mut]>,
+        pub self_token: Token![self],
+    }
+}
+
+mod parsing {
+    use syn::{
+        parse::{discouraged::Speculative, Parse, ParseStream, Result},
+        Attribute, Token,
+    };
+
+    use super::{FnArg, PatType, Receiver};
+
+    impl Parse for FnArg {
+        fn parse(input: ParseStream<'_>) -> Result<Self> {
+            let attrs = input.call(Attribute::parse_outer)?;
+
+            let ahead = input.fork();
+            if let Ok(mut receiver) = ahead.parse::<Receiver>() {
+                if !ahead.peek(Token![:]) {
+                    input.advance_to(&ahead);
+                    receiver.attrs = attrs;
+                    return Ok(FnArg::Receiver(receiver));
+                }
+            }
+
+            let mut typed = input.call(fn_arg_typed)?;
+            typed.attrs = attrs;
+            Ok(FnArg::Typed(typed))
+        }
+    }
+
+    impl Parse for Receiver {
+        fn parse(input: ParseStream<'_>) -> Result<Self> {
+            Ok(Self {
+                attrs: Vec::new(),
+                reference: {
+                    if input.peek(Token![&]) {
+                        Some((input.parse()?, input.parse()?))
+                    } else {
+                        None
+                    }
+                },
+                mutability: input.parse()?,
+                self_token: input.parse()?,
+            })
+        }
+    }
+
+    fn fn_arg_typed(input: ParseStream<'_>) -> Result<PatType> {
+        Ok(PatType {
+            attrs: Vec::new(),
+            pat: input.parse()?,
+            colon_token: input.parse()?,
+            ty: Box::new(input.parse()?),
+        })
+    }
+}
+
+mod printing {
+    use proc_macro2::TokenStream;
+    use quote::{ToTokens, TokenStreamExt};
+
+    use super::Receiver;
+
+    impl ToTokens for Receiver {
+        fn to_tokens(&self, tokens: &mut TokenStream) {
+            tokens.append_all(&self.attrs);
+            if let Some((ampersand, lifetime)) = &self.reference {
+                ampersand.to_tokens(tokens);
+                lifetime.to_tokens(tokens);
+            }
+            self.mutability.to_tokens(tokens);
+            self.self_token.to_tokens(tokens);
+        }
+    }
+}
-- 
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