From 7614b96fe45240dafe91ae549e712b560e2d4c10 Mon Sep 17 00:00:00 2001
From: Emil Fresk <emil.fresk@gmail.com>
Date: Sat, 31 Dec 2022 14:45:13 +0100
Subject: RTIC v2: Initial commit

rtic-syntax is now part of RTIC repository
---
 macros/src/syntax/parse/monotonic.rs | 42 ++++++++++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)
 create mode 100644 macros/src/syntax/parse/monotonic.rs

(limited to 'macros/src/syntax/parse/monotonic.rs')

diff --git a/macros/src/syntax/parse/monotonic.rs b/macros/src/syntax/parse/monotonic.rs
new file mode 100644
index 0000000..0583233
--- /dev/null
+++ b/macros/src/syntax/parse/monotonic.rs
@@ -0,0 +1,42 @@
+use proc_macro2::Span;
+use syn::Attribute;
+use syn::{parse, spanned::Spanned, ItemType, Visibility};
+
+use crate::syntax::parse::util::FilterAttrs;
+use crate::syntax::{
+    ast::{Monotonic, MonotonicArgs},
+    parse::util,
+};
+
+impl MonotonicArgs {
+    pub(crate) fn parse(attr: Attribute) -> parse::Result<Self> {
+        crate::syntax::parse::monotonic_args(attr.path, attr.tokens)
+    }
+}
+
+impl Monotonic {
+    pub(crate) fn parse(args: MonotonicArgs, item: &ItemType, span: Span) -> parse::Result<Self> {
+        if item.vis != Visibility::Inherited {
+            return Err(parse::Error::new(
+                span,
+                "this field must have inherited / private visibility",
+            ));
+        }
+
+        let FilterAttrs { cfgs, attrs, .. } = util::filter_attributes(item.attrs.clone());
+
+        if !attrs.is_empty() {
+            return Err(parse::Error::new(
+                attrs[0].path.span(),
+                "Monotonic does not support attributes other than `#[cfg]`",
+            ));
+        }
+
+        Ok(Monotonic {
+            cfgs,
+            ident: item.ident.clone(),
+            ty: item.ty.clone(),
+            args,
+        })
+    }
+}
-- 
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