1 files changed, 0 insertions, 77 deletions
diff --git a/cros_alsa/cros_alsa_derive/src/common.rs b/cros_alsa/cros_alsa_derive/src/common.rs
deleted file mode 100644
index 2daaa3be..00000000
--- a/cros_alsa/cros_alsa_derive/src/common.rs
+++ /dev/null
@@ -1,77 +0,0 @@
-// Copyright 2020 The Chromium OS Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-//! This mod provides common constants, structs and functions used across cros_alsa_derive.
-use std::convert::TryFrom;
-
-use syn::{Lit, Meta, NestedMeta, Result};
-
-/// Attribute name of cros_alsa.
-const CROS_ALSA: &str = "cros_alsa";
-
-/// const for `#[cros_alsa(path = "...")]`
-const PATH: &str = "path";
-
-/// Possible `#[cros_alsa("...")]` derive macro helper attributes.
-pub enum CrosAlsaAttr {
-    /// Use `#[cros_alsa(path = "crate")]` to replace the crate path of cros_alsa in derive macros.
-    Path(syn::Path),
-}
-
-impl CrosAlsaAttr {
-    /// Return true if the value is a `Path` variant.
-    pub fn is_path(&self) -> bool {
-        use CrosAlsaAttr::*;
-        match self {
-            Path(_) => true,
-            // suppress unreachable_patterns warning because there is only one CrosAlsaAttr variant.
-            #[allow(unreachable_patterns)]
-            _ => false,
-        }
-    }
-}
-
-impl TryFrom<syn::NestedMeta> for CrosAlsaAttr {
-    type Error = syn::Error;
-    fn try_from(meta_item: NestedMeta) -> Result<CrosAlsaAttr> {
-        match meta_item {
-            // Parse `#[cros_alsa(path = "crate")]`
-            NestedMeta::Meta(Meta::NameValue(m)) if m.path.is_ident(PATH) => {
-                if let Lit::Str(lit_str) = &m.lit {
-                    return Ok(CrosAlsaAttr::Path(lit_str.parse()?));
-                }
-                Err(syn::Error::new_spanned(
-                    &m.lit,
-                    "expected a valid path for cros_alsa_derive::CrosAlsaAttr::Path",
-                ))
-            }
-            _ => Err(syn::Error::new_spanned(
-                meta_item,
-                "unrecognized cros_alsa_derive::CrosAlsaAttr",
-            )),
-        }
-    }
-}
-
-/// Parses `#[cros_alsa(path = "...")]` into a list of `CrosAlsaAttr`.
-/// It's used to replace the crate path of cros_alsa in derive macros.
-pub fn parse_cros_alsa_attr(attrs: &[syn::Attribute]) -> Result<Vec<CrosAlsaAttr>> {
-    attrs
-        .iter()
-        .flat_map(|attr| get_cros_alsa_meta_items(attr))
-        .flatten()
-        .map(CrosAlsaAttr::try_from)
-        .collect()
-}
-
-/// Parses and collects `NestedMeta` under `cros_alsa` attribute.
-fn get_cros_alsa_meta_items(attr: &syn::Attribute) -> Result<Vec<syn::NestedMeta>> {
-    if !attr.path.is_ident(CROS_ALSA) {
-        return Ok(Vec::new());
-    }
-    match attr.parse_meta() {
-        Ok(Meta::List(meta)) => Ok(meta.nested.into_iter().collect()),
-        _ => Err(syn::Error::new_spanned(attr, "expected #[cros_alsa(...)]")),
-    }
-}