1 files changed, 88 insertions, 0 deletions
diff --git a/src/bindgen/error.rs b/src/bindgen/error.rs
new file mode 100644
index 0000000..e4002f6
--- /dev/null
+++ b/src/bindgen/error.rs
@@ -0,0 +1,88 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+use std::error;
+use std::fmt;
+
+pub use crate::bindgen::cargo::cargo_expand::Error as CargoExpandError;
+pub use crate::bindgen::cargo::cargo_metadata::Error as CargoMetadataError;
+pub use crate::bindgen::cargo::cargo_toml::Error as CargoTomlError;
+pub use syn::parse::Error as ParseError;
+
+#[derive(Debug)]
+#[allow(clippy::enum_variant_names)]
+pub enum Error {
+    CargoMetadata(String, CargoMetadataError),
+    CargoToml(String, CargoTomlError),
+    CargoExpand(String, CargoExpandError),
+    ParseSyntaxError {
+        crate_name: String,
+        src_path: String,
+        error: ParseError,
+    },
+    ParseCannotOpenFile {
+        crate_name: String,
+        src_path: String,
+    },
+}
+
+impl fmt::Display for Error {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        match *self {
+            Error::CargoMetadata(ref path, ref error) => write!(
+                f,
+                "Couldn't execute `cargo metadata` with manifest {:?}: {:?}",
+                path, error
+            ),
+            Error::CargoToml(ref path, ref error) => {
+                write!(f, "Couldn't load manifest file {:?}: {:?}", path, error)
+            }
+            Error::CargoExpand(ref crate_name, ref error) => write!(
+                f,
+                "Parsing crate `{}`: couldn't run `cargo rustc -Zunpretty=expanded`: {:?}",
+                crate_name, error
+            ),
+            Error::ParseSyntaxError {
+                ref crate_name,
+                ref src_path,
+                ref error,
+            } => {
+                write!(
+                    f,
+                    "Parsing crate `{}`:`{}`:\n{:?}",
+                    crate_name, src_path, error
+                )?;
+
+                if !src_path.is_empty() {
+                    write!(
+                        f,
+                        "\nTry running `rustc -Z parse-only {}` to see a nicer error message",
+                        src_path,
+                    )?
+                }
+                Ok(())
+            }
+            Error::ParseCannotOpenFile {
+                ref crate_name,
+                ref src_path,
+            } => write!(
+                f,
+                "Parsing crate `{}`: cannot open file `{}`.",
+                crate_name, src_path
+            ),
+        }
+    }
+}
+
+impl error::Error for Error {
+    fn source(&self) -> Option<&(dyn error::Error + 'static)> {
+        match self {
+            Error::CargoMetadata(_, ref error) => Some(error),
+            Error::CargoToml(_, ref error) => Some(error),
+            Error::CargoExpand(_, ref error) => Some(error),
+            Error::ParseSyntaxError { ref error, .. } => Some(error),
+            Error::ParseCannotOpenFile { .. } => None,
+        }
+    }
+}