commit f28f367186ce3d77a4475ab57f7cfbf3935924d5
author David Tolnay <dtolnay@gmail.com> Sat Mar 31 18:36:42 2018 +0200
committer GitHub <noreply@github.com> Sat Mar 31 18:36:42 2018 +0200
tree 9b1fb057c21902ddd2f6b3b49cd17edfe0e98bbb
parent fe58b5a725e85f85e25a7f1e8303b3e7edd72fc8
parent 6434beb23363a6acef0b88550e3980037ed26f6c

Merge pull request #363 from staktrace/standalone

Add a feature for linking to proc_macro.

Cargo.toml

diff --git a/Cargo.toml b/Cargo.toml
index 674c176..37449d8 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -15,7 +15,7 @@
 required-features = ["full", "parsing", "extra-traits"]
 
 [features]
-default = ["derive", "parsing", "printing", "clone-impls"]
+default = ["derive", "parsing", "printing", "clone-impls", "proc-macro"]
 derive = []
 full = []
 parsing = []
@@ -25,11 +25,12 @@
 fold = []
 clone-impls = []
 extra-traits = []
+proc-macro = ["proc-macro2/proc-macro", "quote/proc-macro"]
 
 [dependencies]
-proc-macro2 = "0.3"
-#quote = { version = "0.5", optional = true }
-quote = { git = 'https://github.com/dtolnay/quote', optional = true }
+proc-macro2 = { version = "0.3", default-features = false }
+#quote = { version = "0.5", optional = true, default-features = false }
+quote = { git = 'https://github.com/dtolnay/quote', optional = true, default-features = false }
 unicode-xid = "0.1"
 
 [dev-dependencies]

src/buffer.rs

diff --git a/src/buffer.rs b/src/buffer.rs
index 10ac5f6..d92a7a6 100644
--- a/src/buffer.rs
+++ b/src/buffer.rs
@@ -127,6 +127,7 @@
 // and caution should be used when editing it. The public-facing interface is
 // 100% safe but the implementation is fragile internally.
 
+#[cfg(feature = "proc-macro")]
 use proc_macro as pm;
 use proc_macro2::{Delimiter, Literal, Span, Term, TokenStream};
 use proc_macro2::{Group, TokenTree, Op};
@@ -219,6 +220,7 @@
 
     /// Creates a `TokenBuffer` containing all the tokens from the input
     /// `TokenStream`.
+    #[cfg(feature = "proc-macro")]
     pub fn new(stream: pm::TokenStream) -> TokenBuffer {
         Self::new2(stream.into())
     }

src/lib.rs

diff --git a/src/lib.rs b/src/lib.rs
index d881cd9..fc6d978 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -262,6 +262,7 @@
                   redundant_closure, needless_pass_by_value, redundant_field_names))]
 
 extern crate proc_macro2;
+#[cfg(feature = "proc-macro")]
 extern crate proc_macro;
 extern crate unicode_xid;
 
@@ -572,7 +573,7 @@
 /// #
 /// # fn main() {}
 /// ```
-#[cfg(feature = "parsing")]
+#[cfg(all(feature = "parsing", feature = "proc-macro"))]
 pub fn parse<T>(tokens: proc_macro::TokenStream) -> Result<T, ParseError>
 where
     T: Synom,

src/synom.rs

diff --git a/src/synom.rs b/src/synom.rs
index 6a33f4f..935b7a8 100644
--- a/src/synom.rs
+++ b/src/synom.rs
@@ -149,6 +149,7 @@
 //!
 //! *This module is available if Syn is built with the `"parsing"` feature.*
 
+#[cfg(feature = "proc-macro")]
 use proc_macro;
 use proc_macro2;
 
@@ -225,6 +226,7 @@
     fn parse2(self, tokens: proc_macro2::TokenStream) -> Result<Self::Output, ParseError>;
 
     /// Parse tokens of source code into the chosen syntax tree node.
+    #[cfg(feature = "proc-macro")]
     fn parse(self, tokens: proc_macro::TokenStream) -> Result<Self::Output, ParseError> {
         self.parse2(tokens.into())
     }