Add struct indexing parsing

reid/src/ast/mod.rs

@@ -44,12 +44,13 @@ pub enum ExpressionKind {
     VariableName(String),
     Literal(Literal),
     Array(Vec<Expression>),
-    Index(Box<Expression>, u64),
+    ArrayIndex(Box<Expression>, u64),
+    StructIndex(Box<Expression>, String),
     Binop(BinaryOperator, Box<Expression>, Box<Expression>),
     FunctionCall(Box<FunctionCallExpression>),
     BlockExpr(Box<Block>),
     IfExpr(Box<IfExpression>),
-    StructInit(StructInit),
+    StructExpression(StructExpression),
 }
 
 #[derive(Debug, Clone, Copy)]
@@ -132,7 +133,7 @@ pub enum ReturnType {
 }
 
 #[derive(Debug, Clone)]
-pub struct StructInit {
+pub struct StructExpression {
     name: String,
     fields: Vec<(String, Expression)>,
 }
@@ -150,7 +151,8 @@ pub struct VariableReference(pub VariableReferenceKind, pub TokenRange);
 #[derive(Debug, Clone)]
 pub enum VariableReferenceKind {
     Name(String, TokenRange),
-    Index(Box<VariableReference>, u64),
+    ArrayIndex(Box<VariableReference>, u64),
+    StructIndex(Box<VariableReference>, String),
 }
 
 #[derive(Debug, Clone)]

reid/src/ast/parse.rs

@@ -80,7 +80,7 @@ impl Parse for PrimaryExpression {
             (stream.peek(), stream.peek2())
         {
             Expression(
-                Kind::StructInit(stream.parse()?),
+                Kind::StructExpression(stream.parse()?),
                 stream.get_range().unwrap(),
             )
         } else if let Some(token) = stream.next() {
@@ -88,7 +88,7 @@ impl Parse for PrimaryExpression {
                 Token::Identifier(v) => {
                     if let Some(Token::BraceOpen) = stream.peek() {
                         Expression(
-                            Kind::StructInit(stream.parse()?),
+                            Kind::StructExpression(stream.parse()?),
                             stream.get_range().unwrap(),
                         )
                     } else {
@@ -134,12 +134,22 @@ impl Parse for PrimaryExpression {
             Err(stream.expected_err("expression")?)?
         };
 
-        while let Ok(ValueIndex(idx)) = stream.parse() {
+        while let Ok(index) = stream.parse::<ValueIndex>() {
+            match index {
+                ValueIndex::Array(ArrayValueIndex(idx)) => {
                     expr = Expression(
-                ExpressionKind::Index(Box::new(expr), idx),
+                        ExpressionKind::ArrayIndex(Box::new(expr), idx),
                         stream.get_range().unwrap(),
                     );
                 }
+                ValueIndex::Struct(StructValueIndex(name)) => {
+                    expr = Expression(
+                        ExpressionKind::StructIndex(Box::new(expr), name),
+                        stream.get_range().unwrap(),
+                    );
+                }
+            }
+        }
 
         Ok(PrimaryExpression(expr))
     }
@@ -415,9 +425,9 @@ impl Parse for VariableReference {
                 stream.get_range().unwrap(),
             );
 
-            while let Ok(ValueIndex(idx)) = stream.parse() {
+            while let Ok(ArrayValueIndex(idx)) = stream.parse() {
                 var_ref = VariableReference(
-                    VariableReferenceKind::Index(Box::new(var_ref), idx),
+                    VariableReferenceKind::ArrayIndex(Box::new(var_ref), idx),
                     stream.get_range().unwrap(),
                 );
             }
@@ -429,7 +439,7 @@ impl Parse for VariableReference {
     }
 }
 
-impl Parse for StructInit {
+impl Parse for StructExpression {
     fn parse(mut stream: TokenStream) -> Result<Self, Error> {
         let Some(Token::Identifier(name)) = stream.next() else {
             return Err(stream.expected_err("struct identifier")?);
@@ -439,9 +449,8 @@ impl Parse for StructInit {
         let fields = named_list.0.into_iter().map(|f| (f.0, f.1)).collect();
 
         stream.expect(Token::BraceClose)?;
-        stream.expect(Token::Semi)?;
 
-        Ok(StructInit { name, fields })
+        Ok(StructExpression { name, fields })
     }
 }
 
@@ -480,21 +489,51 @@ impl<T: Parse + std::fmt::Debug> Parse for NamedField<T> {
     }
 }
 
-#[derive(Debug, Clone, Copy)]
-pub struct ValueIndex(u64);
+#[derive(Debug, Clone)]
+pub enum ValueIndex {
+    Array(ArrayValueIndex),
+    Struct(StructValueIndex),
+}
 
 impl Parse for ValueIndex {
+    fn parse(mut stream: TokenStream) -> Result<Self, Error> {
+        match stream.peek() {
+            Some(Token::BracketOpen) => Ok(ValueIndex::Array(stream.parse()?)),
+            Some(Token::Dot) => Ok(ValueIndex::Struct(stream.parse()?)),
+            _ => Err(stream.expected_err("value or struct index")?),
+        }
+    }
+}
+
+#[derive(Debug, Clone, Copy)]
+pub struct ArrayValueIndex(u64);
+
+impl Parse for ArrayValueIndex {
     fn parse(mut stream: TokenStream) -> Result<Self, Error> {
         stream.expect(Token::BracketOpen)?;
         if let Some(Token::DecimalValue(idx)) = stream.next() {
             stream.expect(Token::BracketClose)?;
-            Ok(ValueIndex(idx))
+            Ok(ArrayValueIndex(idx))
         } else {
             return Err(stream.expected_err("array index (number)")?);
         }
     }
 }
 
+#[derive(Debug, Clone)]
+pub struct StructValueIndex(String);
+
+impl Parse for StructValueIndex {
+    fn parse(mut stream: TokenStream) -> Result<Self, Error> {
+        stream.expect(Token::Dot)?;
+        if let Some(Token::Identifier(name)) = stream.next() {
+            Ok(StructValueIndex(name))
+        } else {
+            return Err(stream.expected_err("struct index (number)")?);
+        }
+    }
+}
+
 impl Parse for BlockLevelStatement {
     fn parse(mut stream: TokenStream) -> Result<Self, Error> {
         use BlockLevelStatement as Stmt;

reid/src/ast/process.rs

@@ -152,9 +152,12 @@ impl ast::VariableReferenceKind {
                     (*range).into(),
                 ))
             }
-            ast::VariableReferenceKind::Index(var_ref, idx) => {
+            ast::VariableReferenceKind::ArrayIndex(var_ref, idx) => {
                 mir::IndexedVariableReferenceKind::Index(Box::new(var_ref.process()), *idx)
             }
+            ast::VariableReferenceKind::StructIndex(variable_reference, _) => {
+                todo!("struct indexing into mir")
+            }
         }
     }
 }
@@ -194,12 +197,15 @@ impl ast::Expression {
             ast::ExpressionKind::Array(expressions) => {
                 mir::ExprKind::Array(expressions.iter().map(|e| e.process()).collect())
             }
-            ast::ExpressionKind::Index(expression, idx) => mir::ExprKind::Index(
+            ast::ExpressionKind::ArrayIndex(expression, idx) => mir::ExprKind::Index(
                 Box::new(expression.process()),
                 mir::TypeKind::Vague(mir::VagueType::Unknown),
                 *idx,
             ),
-            ast::ExpressionKind::StructInit(struct_init) => todo!("implement struct init process"),
+            ast::ExpressionKind::StructExpression(struct_init) => {
+                todo!("implement struct init process")
+            }
+            ast::ExpressionKind::StructIndex(expression, _) => todo!("struct index expression"),
         };
 
         mir::Expression(kind, self.1.into())