remove redundant array dimension struct

compiler/ast/src/common/array_dimensions.rs

@@ -20,41 +20,12 @@ use serde::{ser::SerializeSeq, Deserialize, Serialize, Serializer};
 use smallvec::{smallvec, SmallVec};
 use std::{fmt, ops::Deref};
 
-/// A single array dimension.
-#[derive(Clone, Deserialize, Debug, PartialEq, Eq, Hash)]
-pub enum Dimension {
-    /// The dimension was specified, e.g., `5` elements.
-    Number(PositiveNumber),
-}
-
-impl fmt::Display for Dimension {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        match self {
-            Self::Number(num) => write!(f, "{}", num),
-        }
-    }
-}
-
-impl Dimension {
-    /// } Returns `Some(n)` unless the dimension is [`Unspecified`].
-    pub fn as_specified(&self) -> Option<&PositiveNumber> {
-        match self {
-            Self::Number(n) => Some(n),
-        }
-    }
-
-    /// Returns true if the dimension is known to be zero.
-    fn is_zero(&self) -> bool {
-        self.as_specified().filter(|n| n.is_zero()).is_some()
-    }
-}
-
 /// Specifies array dimensions for array [`Type`]s or in array initializer [`Expression`]s.
 #[derive(Clone, Deserialize, Debug, PartialEq, Eq, Hash)]
-pub struct ArrayDimensions(pub SmallVec<[Dimension; 1]>);
+pub struct ArrayDimensions(pub SmallVec<[PositiveNumber; 1]>);
 
 impl Deref for ArrayDimensions {
-    type Target = [Dimension];
+    type Target = [PositiveNumber];
 
     fn deref(&self) -> &Self::Target {
         &*self.0
@@ -63,7 +34,7 @@ impl Deref for ArrayDimensions {
 
 impl ArrayDimensions {
     /// Returns a single-dimensional array dimension.
-    pub fn single(dim: Dimension) -> Self {
+    pub fn single(dim: PositiveNumber) -> Self {
         Self(smallvec![dim])
     }
 
@@ -73,7 +44,7 @@ impl ArrayDimensions {
     }
 
     /// Attempts to remove the first dimension from the array, or returns `None` if it doesn't.
-    pub fn remove_first(&mut self) -> Option<Dimension> {
+    pub fn remove_first(&mut self) -> Option<PositiveNumber> {
         if self.is_empty() {
             None
         } else {
@@ -82,7 +53,7 @@ impl ArrayDimensions {
     }
 
     /// Attempts to remove the last dimension from the array, or returns `None` if it doesn't.
-    pub fn remove_last(&mut self) -> Option<Dimension> {
+    pub fn remove_last(&mut self) -> Option<PositiveNumber> {
         self.0.pop()
     }
 }
@@ -95,9 +66,7 @@ impl Serialize for ArrayDimensions {
     {
         let mut seq = serializer.serialize_seq(Some(self.0.len()))?;
         for dim in self.0.iter() {
-            match dim {
-                Dimension::Number(num) => seq.serialize_element(&num)?,
-            }
+            seq.serialize_element(&dim)?;
         }
         seq.end()
     }

compiler/ast/src/input/input_value.rs

@@ -88,8 +88,7 @@ impl TryFrom<(Type, Expression)> for InputValue {
                 }
 
                 if let Some(dimension) = array_init.dimensions.remove_first() {
-                    if let Some(number) = dimension.as_specified() {
-                        let size = number.value.parse::<usize>().unwrap();
+                    let size = dimension.value.parse::<usize>().unwrap();
                     let mut values = Vec::with_capacity(size);
 
                     // For when Dimensions are specified in a canonical way: [[u8; 3], 2];
@@ -111,9 +110,6 @@ impl TryFrom<(Type, Expression)> for InputValue {
                     };
 
                     Self::Array(values)
-                    } else {
-                        unreachable!("dimensions must be specified");
-                    }
                 } else {
                     unreachable!("dimensions are checked for zero");
                 }

compiler/parser/src/parser/type_.rs

@@ -59,12 +59,12 @@ impl ParserContext<'_> {
 
     /// Returns an [`ArrayDimensions`] AST node if the next tokens represent dimensions for an array type.
     pub fn parse_array_dimensions(&mut self) -> Result<ArrayDimensions> {
-        Ok(if let Some(dim) = self.parse_array_dimension() {
+        Ok(if let Some((dim, _)) = self.eat_int() {
             ArrayDimensions(smallvec![dim])
         } else {
             let mut had_item_err = false;
             let (dims, _, span) = self.parse_paren_comma_list(|p| {
-                Ok(if let Some(dim) = p.parse_array_dimension() {
+                Ok(if let Some((dim, _)) = p.eat_int() {
                     Some(dim)
                 } else {
                     let token = p.expect_any()?;
@@ -80,15 +80,6 @@ impl ParserContext<'_> {
         })
     }
 
-    /// Parses a basic array dimension, i.e., an integer or `_`.
-    fn parse_array_dimension(&mut self) -> Option<Dimension> {
-        if let Some((int, _)) = self.eat_int() {
-            Some(Dimension::Number(int))
-        } else {
-            None
-        }
-    }
-
     /// Returns a [`(Type, Span)`] tuple of AST nodes if the next token represents a type.
     /// Also returns the span of the parsed token.
     pub fn parse_type(&mut self) -> Result<(Type, Span)> {