Work on grammar and reorganize src/ast/mod.rs.

src/ast/build.rs

@@ -1,8 +1,8 @@
 use crate::ast::{
-    CompilationUnit, DelegateOrIdentifier, Fqn, FunctionModifier, FunctionTypeUse, GenericArgument,
-    GenericArguments, GenericParameter, GenericParameters, Identifier, InputArgument,
-    InputArguments, InterfaceOrClassTypeUse, Reference, References, ReturnType, TupleTypeUse,
-    TypeUse, VoidOrTypeUse,
+    CompilationUnit, DelegateOrIdentifier, FullyQualifiedName, FunctionModifier, FunctionTypeUse,
+    GenericArgument, GenericArguments, GenericParameter, GenericParameters, Identifier,
+    InputArgument, InputArguments, InterfaceOrClassTypeUse, Reference, References, ReturnType,
+    TupleTypeUse, TypeUse, VoidOrTypeUse,
 };
 use crate::parser::Rule;
 use pest::iterators::Pair;
@@ -24,7 +24,7 @@ fn build_identifier(identifier_pair: Pair<Rule>) -> Identifier {
     }
 }
 
-fn build_fqn(fqn_pair: Pair<Rule>) -> Fqn {
+fn build_fqn(fqn_pair: Pair<Rule>) -> FullyQualifiedName {
     let mut identifiers: Vec<Identifier> = vec![];
     for identifier_pair in fqn_pair.into_inner() {
         identifiers.push(expect_and_use(
@@ -33,7 +33,7 @@ fn build_fqn(fqn_pair: Pair<Rule>) -> Fqn {
             build_identifier,
         ));
     }
-    Fqn { identifiers }
+    FullyQualifiedName { identifiers }
 }
 
 fn build_type_use(type_use_pair: Pair<Rule>) -> TypeUse {

src/ast/mod.rs

@@ -8,7 +8,8 @@ pub mod unparse;
 #[derive(Debug)]
 pub enum Operator {
     Binary(BinaryOperator),
-    Unary(UnaryOperator),
+    PrefixUnary(PrefixUnaryOperator),
+    SuffixUnary(SuffixUnaryOperator),
 }
 
 #[derive(Debug)]
@@ -31,16 +32,21 @@ pub enum BinaryOperator {
 }
 
 #[derive(Debug)]
-pub enum UnaryOperator {
+pub enum PrefixUnaryOperator {
+    Spread,
+    Borrow,
+    BorrowMut,
     Not,
     Negative,
-    PlusPlus,
-    MinusMinus,
-    CallOp,
-    Spread,
 }
 
-// Names
+#[derive(Debug)]
+pub enum SuffixUnaryOperator {
+    PlusPlus,
+    MinusMinus,
+}
+
+/* Names */
 
 #[derive(Debug, Clone)]
 pub struct Identifier {
@@ -48,48 +54,11 @@ pub struct Identifier {
 }
 
 #[derive(Debug)]
-pub struct Fqn {
+pub struct FullyQualifiedName {
     pub identifiers: Vec<Identifier>,
 }
 
-// Generic parameters
-
-#[derive(Debug)]
-pub struct GenericParameters(pub Vec<GenericParameter>);
-
-impl GenericParameters {
-    pub fn is_empty(&self) -> bool {
-        self.0.is_empty()
-    }
-}
-
-#[derive(Debug)]
-pub struct GenericParameter(Identifier);
-
-// Generic arguments
-
-#[derive(Debug)]
-pub struct GenericArguments(pub Vec<GenericArgument>);
-
-impl GenericArguments {
-    pub fn is_empty(&self) -> bool {
-        self.0.is_empty()
-    }
-}
-
-#[derive(Debug)]
-pub struct GenericArgument {
-    pub fqn: Fqn,
-}
-
-// Type-use and components
-
-// #[derive(Debug)]
-// pub struct TypeUse {
-//     pub fqn: Fqn,
-//     pub arguments: Option<TypeArguments>,
-//     pub inputs: Option<InputArguments>,
-// }
+/* Type Use */
 
 #[derive(Debug)]
 pub enum TypeUse {
@@ -100,7 +69,7 @@ pub enum TypeUse {
 
 #[derive(Debug)]
 pub struct InterfaceOrClassTypeUse {
-    pub fqn: Fqn,
+    pub fqn: FullyQualifiedName,
     pub generics: GenericArguments,
 }
 
@@ -116,26 +85,68 @@ pub struct FunctionTypeUse {
     pub return_type: ReturnType,
 }
 
-#[derive(Debug)]
-pub enum TypeArguments {
-    Generics(GenericArguments),
-    Tuple(TupleArguments),
-    Function(FunctionTypeArguments),
-}
+// Generic arguments
 
 #[derive(Debug)]
-pub struct TupleArguments(pub Vec<Fqn>);
+pub struct GenericArguments(pub Vec<GenericArgument>);
 
-impl TupleArguments {
+impl GenericArguments {
     pub fn is_empty(&self) -> bool {
         self.0.is_empty()
     }
 }
 
 #[derive(Debug)]
-pub struct FunctionTypeArguments {
-    pub parameters: TupleParameters,
-    pub return_type: Box<TypeUse>,
+pub struct GenericArgument {
+    pub fqn: FullyQualifiedName,
+}
+
+/* Function Modifier */
+
+#[derive(Debug)]
+pub enum FunctionModifier {
+    Static,
+    Cons,
+    Mut,
+    Ref,
+    MutRef,
+}
+
+/* Generic parameters */
+
+#[derive(Debug)]
+pub struct GenericParameters(pub Vec<GenericParameter>);
+
+impl GenericParameters {
+    pub fn is_empty(&self) -> bool {
+        self.0.is_empty()
+    }
+}
+
+#[derive(Debug)]
+pub struct GenericParameter(Identifier);
+
+/* Input Arguments */
+
+#[derive(Debug)]
+pub struct InputArguments(pub Vec<InputArgument>);
+
+impl InputArguments {
+    pub fn is_empty(&self) -> bool {
+        self.0.is_empty()
+    }
+}
+
+#[derive(Debug)]
+pub struct InputArgument {
+    pub lhs: DelegateOrIdentifier,
+    pub rhs: Identifier,
+}
+
+#[derive(Debug)]
+pub enum DelegateOrIdentifier {
+    Delegate,
+    Identifier(Identifier),
 }
 
 // Function components
@@ -179,54 +190,13 @@ impl References {
 #[derive(Debug)]
 pub struct Reference(pub Identifier);
 
-// Inputs
+/* Input Parameters */
 
 #[derive(Debug)]
-pub enum DelegateOrIdentifier {
-    Delegate,
-    Identifier(Identifier),
-}
+pub struct InputParameters(pub Vec<InputParameter>);
 
 #[derive(Debug)]
-pub struct InputParameters(pub Vec<DelegateOrIdentifier>);
-
-impl InputParameters {
-    pub fn is_empty(&self) -> bool {
-        self.0.is_empty()
-    }
-}
-
-#[derive(Debug)]
-pub struct InputArguments(pub Vec<InputArgument>);
-
-impl InputArguments {
-    pub fn is_empty(&self) -> bool {
-        self.0.is_empty()
-    }
-}
-
-#[derive(Debug)]
-pub struct InputArgument {
-    pub lhs: DelegateOrIdentifier,
-    pub rhs: Identifier,
-}
-
-// Where guards
-
-#[derive(Debug)]
-pub struct WhereGuards(pub Vec<WhereGuard>);
-
-impl WhereGuards {
-    pub fn is_empty(&self) -> bool {
-        self.0.is_empty()
-    }
-}
-
-#[derive(Debug)]
-pub struct WhereGuard {
-    pub identifier: Identifier,
-    pub implements: ImplementsList,
-}
+pub struct InputParameter(pub TypeUse);
 
 // Implements
 
@@ -243,7 +213,7 @@ impl ImplementsList {
 
 #[derive(Debug)]
 pub struct CompilationUnit {
-    pub namespace: Option<Fqn>,
+    pub namespace: Option<FullyQualifiedName>,
     pub declarations: Vec<ModuleLevelDeclaration>,
 }
 
@@ -287,8 +257,8 @@ pub enum ClassLevelDeclaration {
 pub struct TypeDeclaration {
     pub is_public: bool,
     pub identifier: Identifier,
-    pub parameters: Option<TypeParameters>,
-    pub where_guards: WhereGuards,
+    pub lhs: TypeUse,
+    pub where_guards: TypeWhereGuards,
     pub rhs: TypeUse,
 }
 
@@ -305,8 +275,8 @@ pub struct InterfaceDeclaration {
     pub identifier: Identifier,
     pub generics: GenericParameters,
     pub inputs: InputParameters,
+    pub return_type: Option<ReturnType>,
     pub implements: ImplementsList,
-    pub where_guards: WhereGuards,
     pub declarations: Vec<InterfaceLevelDeclaration>,
 }
 
@@ -316,30 +286,68 @@ pub struct ClassDeclaration {
     pub identifier: Identifier,
     pub generics: GenericParameters,
     pub class_constructor: Option<ClassConstructor>,
-    pub inputs: InputArguments,
     pub implements: ImplementsList,
-    pub where_guards: WhereGuards,
     pub declarations: Vec<ClassLevelDeclaration>,
 }
 
+// Type components
+
+#[derive(Debug)]
+pub struct TypeWhereGuards(pub Vec<TypeWhereGuard>);
+
+#[derive(Debug)]
+pub struct TypeWhereGuard {
+    pub identifier: Identifier,
+    pub implements: TypeImplementsList,
+}
+
+#[derive(Debug)]
+pub struct TypeImplementsList(pub Vec<TypeImplements>);
+
+#[derive(Debug)]
+pub struct TypeImplements {
+    pub fqn: FullyQualifiedName,
+    pub arguments: TypeImplementsArguments,
+}
+
+#[derive(Debug)]
+pub enum TypeImplementsArguments {
+    Generic(TypeGenericArguments),
+    Tuple(TypeTupleArguments),
+    Function(TypeFunctionArguments),
+}
+
+#[derive(Debug)]
+pub struct TypeGenericArguments(pub Vec<TypeGenericArgument>);
+
+#[derive(Debug)]
+pub enum TypeGenericArgument {
+    Underscore,
+    FullyQualifiedName(FullyQualifiedName),
+    Infer(Identifier),
+}
+
+#[derive(Debug)]
+pub struct TypeTupleArguments(pub Vec<TypeTupleArgument>);
+
+#[derive(Debug)]
+pub enum TypeTupleArgument {
+    Underscore,
+    FullyQualifiedName(FullyQualifiedName),
+    Infer(Identifier),
+    EllipsisUnderscore,
+    EllipsisInfer(Identifier),
+}
+
+#[derive(Debug)]
+pub struct TypeFunctionArguments {
+    pub generics: GenericArguments,
+    pub parameters: TypeTupleArguments,
+    pub return_type: ReturnType,
+}
+
 // Function declarations and components
 
-#[derive(Debug)]
-pub enum FunctionModifier {
-    Static,
-    Cons,
-    Mut,
-    Ref,
-    MutRef,
-}
-
-#[derive(Debug)]
-pub enum FunctionBody {
-    EqualsBody(Expression),
-    BlockBody(BlockStatement),
-    AliasBody(Identifier),
-}
-
 #[derive(Debug)]
 pub struct FunctionDeclaration {
     pub is_public: bool,
@@ -390,22 +398,13 @@ pub struct InterfaceOperatorFunctionDeclaration {
     pub return_type: ReturnType,
 }
 
-// Type components
+// TODO: default interface functions
 
 #[derive(Debug)]
-pub enum TypeParameters {
-    Generic(GenericParameters),
-    Tuple(TupleParameters),
-    Function(FunctionTypeParameters),
-}
-
-#[derive(Debug)]
-pub struct TupleParameters(pub Vec<Identifier>);
-
-#[derive(Debug)]
-pub struct FunctionTypeParameters {
-    pub parameters: Parameters,
-    pub return_type: TypeUse,
+pub enum FunctionBody {
+    Equals(Expression),
+    Block(BlockStatement),
+    Alias(Identifier),
 }
 
 // Class components
@@ -435,9 +434,9 @@ pub struct BlockStatement(pub Vec<Statement>);
 #[derive(Debug)]
 pub enum Statement {
     BlockStatement(BlockStatement),
-    CallStatement(CallExpression),
     VariableDeclarationStatement(VariableDeclarationStatement),
     AssignStatement(AssignStatement),
+    CallStatement(CallExpression),
     ReturnStatement(ReturnStatement),
     IfStatement(IfStatement),
     IfElseStatement(IfElseStatement),
@@ -462,15 +461,15 @@ pub struct ReturnStatement(pub Option<Expression>);
 #[derive(Debug)]
 pub struct IfStatement {
     pub condition: Expression,
-    pub then_branch: BlockStatement,
+    pub then_block: BlockStatement,
 }
 
 #[derive(Debug)]
 pub struct IfElseStatement {
     pub condition: Expression,
-    pub then_branch: BlockStatement,
+    pub then_block: BlockStatement,
     pub else_ifs: ElseIfs,
-    pub else_branch: BlockStatement,
+    pub else_block: BlockStatement,
 }
 
 #[derive(Debug)]
@@ -493,6 +492,7 @@ pub struct ForStatement {
 
 #[derive(Debug)]
 pub enum Expression {
+    Ternary(TernaryExpression),
     Binary(BinaryExpression),
     Unary(UnaryExpression),
     Assignment(Box<AssignmentExpression>),
@@ -500,6 +500,13 @@ pub enum Expression {
     Literal(Literal),
 }
 
+#[derive(Debug)]
+pub struct TernaryExpression {
+    pub condition: Box<Expression>,
+    pub true_block: Box<Expression>,
+    pub false_block: Box<Expression>,
+}
+
 #[derive(Debug)]
 pub struct BinaryExpression {
     pub left: Box<Expression>,
@@ -509,8 +516,9 @@ pub struct BinaryExpression {
 
 #[derive(Debug)]
 pub struct UnaryExpression {
-    pub operator: UnaryOperator,
+    pub lhs_operators: Vec<PrefixUnaryOperator>,
     pub expression: Box<Expression>,
+    pub rhs_operators: Vec<SuffixUnaryOperator>,
 }
 
 #[derive(Debug)]

src/parser/deimos.pest

@@ -20,6 +20,13 @@ Delegate = { "delegate" }
 Let = { "let" }
 Fn = { "fn" }
 Op = { "op" }
+Return = { "return" }
+If = { "if" }
+Else = { "else" }
+While = { "while" }
+For = { "for" }
+In = { "in" }
+Move = { "move" }
 
 // Keywords as a rule (for preventing identifiers with keywords, etc.)
 Keyword = {
@@ -44,11 +51,19 @@ Keyword = {
     | Let
     | Fn
     | Op
+    | Return
+    | If
+    | Else
+    | While
+    | For
+    | In
+    | Move
 }
 
 // Symbols
 Ellipsis = { "..." }
 Underscore = { "_" }
+Semicolon = { ";" }
 
 // Operators
 Or = { "||" }
@@ -70,6 +85,10 @@ PlusPlus = { "++" }
 MinusMinus = { "--" }
 CallOp = { "()" }
 Spread = { Ellipsis }
+Borrow = { "&" }
+Star = { "*" }
+LeftShift = { "<<" }
+RightShift = { ">>" }
 
 Operator = {
       Or
@@ -91,15 +110,12 @@ Operator = {
     | MinusMinus
     | CallOp
     | Spread
+    | Borrow
+    | Star
 }
 
 // Commonly shared constructs
 
-FullyQualifiedName = {
-      Identifier
-    ~ ( "::" ~ Identifier )*
-}
-
 Identifier = @{
       ( Keyword ~ IdentifierChar | !Keyword ~ IdentifierStartChar )
     ~ IdentifierChar*
@@ -118,14 +134,25 @@ IdentifierChar = {
     | "_"
 }
 
+FullyQualifiedName = {
+      Identifier
+    ~ ( "::" ~ Identifier )*
+}
+
 // In general:
 // Arguments = usage
 // Parameters = declaration
 
 TypeUse = {
+      (
+          Mut
+        | ( Borrow ~ Mut? )*
+      )?
+    ~ (
           InterfaceOrClassTypeUse
         | TupleTypeUse
         | FunctionTypeUse
+      )
 }
 
 InterfaceOrClassTypeUse = {
@@ -151,12 +178,7 @@ FunctionTypeUse = {
     ~ ReturnType
 }
 
-FunctionTypeModifier = {
-      Cons
-    | Mut ~ Ref
-    | Mut
-    | Ref
-}
+// Generic Arguments
 
 GenericArguments = {
       "<"
@@ -165,40 +187,6 @@ GenericArguments = {
     ~ ">"
 }
 
-InputArguments = {
-      "|"
-    ~ (
-          InputArgument
-        ~ ( "," ~ InputArgument )*
-      )?
-    ~ "|"
-}
-
-InputArgument = {
-      Identifier
-    ~ ( "=" ~ Identifier )
-}
-
-RefList = {
-      Ref
-    ~ Identifier
-    ~ ( "," ~ Identifier )*
-}
-
-FunctionInputArguments = {
-      "|"
-    ~ (
-          FunctionInputArgument
-        ~ ( "," ~ FunctionInputArgument )*
-      )?
-    ~ "|"
-}
-
-FunctionInputArgument = {
-      ( Delegate | Identifier )
-    ~ ( "=" ~ Identifier )
-}
-
 // Generic Parameters
 
 GenericParameters = {
@@ -208,67 +196,75 @@ GenericParameters = {
     ~ ">"
 }
 
-InputParameters = {
+// Function Input Arguments
+
+FunctionInputArguments = {
       "|"
-    ~ InputParameter
-    ~ ( "," ~ InputParameter )*
+    ~ (
+          FunctionInputArgument
+        ~ ( "," ~ FunctionInputArgument )*
+      )?
     ~ "|"
 }
 
-InputParameter = {
-      Identifier
-    ~ ":"
-    ~ TypeUse
+FunctionInputArgument = {
+      ( Delegate ~ "=" ~ Identifier )
+    | Identifier
 }
 
-TupleGenericParameters = {
+// Function type components
+
+FunctionTypeModifier = {
+      Cons
+    | Mut ~ Ref
+    | Mut
+    | Ref
+}
+
+Parameters = {
       "("
     ~ (
-          Identifier
-        ~ ( "," ~ Identifier )*
+          Parameter
+        ~ ( "," ~ Parameter )*
       )?
     ~ ")"
 }
 
-FunctionGenericParameters = {
-      TupleGenericParameters
-    ~ FunctionGenericParameterReturnType
-}
-
-FunctionGenericParameterReturnType = {
-      "->"
-    ~ ( Void | Identifier )
-    ~ RefList?
-}
-
-FunctionInputParameters = {
-      "|"
-    ~ FunctionInputParameter
-    ~ ( "," ~ FunctionInputParameter )*
-    ~ "|"
-}
-
-FunctionInputParameter = {
-      ( Delegate | Identifier )
+Parameter = {
+      Identifier
     ~ ":"
     ~ TypeUse
 }
 
+ReturnType = {
+      "->"
+    ~ ( Void | TypeUse )
+    ~ RefList?
+}
+
+RefList = {
+      Ref
+    ~ Identifier
+    ~ ( "," ~ Identifier )*
+}
+
+// Input Parameters
+
+InputParameters = {
+      "("
+    ~ (
+          TypeUse
+        ~ ( "," ~ TypeUse )*
+      )?
+    ~ ")"
+}
+
+// Implements list
+
 ImplementsList = {
       ":"
     ~ TypeUse
-    ~ ( "+" ~ TypeUse )
-}
-
-WhereGuards = {
-      Where
-    ~ WhereGuard
-    ~ ( "," ~ WhereGuard )*
-}
-
-WhereGuard = {
-      Identifier
-    ~ ImplementsList
+    ~ ( "+" ~ TypeUse )*
 }
 
 // Top-level constructs
@@ -324,7 +320,7 @@ Type = {
       Pub?
     ~ TypeKw
     ~ Identifier
-    ~ GenericParameters?
+    ~ TypeUse
     ~ TypeWhereGuards?
     ~ "="
     ~ TypeUse
@@ -341,9 +337,10 @@ Interface = {
       Pub?
     ~ Int
     ~ Identifier
-    ~ InterfaceGenericParametersAndInputs?
+    ~ GenericParameters?
+    ~ InputParameters?
+    ~ ReturnType?
     ~ ImplementsList?
-    ~ WhereGuards?
     ~ ( "{" ~ InterfaceLevelDeclaration* ~ "}" )?
 }
 
@@ -354,8 +351,6 @@ Class = {
     ~ GenericParameters?
     ~ ClassConstructor?
     ~ ImplementsList?
-    ~ InputArguments?
-    ~ WhereGuards?
     ~ ( "{" ~ ClassLevelDeclaration* ~ "}" )?
 }
 
@@ -370,19 +365,23 @@ TypeWhereGuards = {
 TypeWhereGuard = {
       Identifier
     ~ ":"
-    ~ TypeTypeUse
-    ~ ( "+" ~ TypeTypeUse )*
+    ~ TypeImplementsList
 }
 
-TypeTypeUse = {
+TypeImplementsList = {
+     TypeImplements
+   ~ ( "+" ~ TypeImplements )*
+}
+
+TypeImplements = {
       FullyQualifiedName
-    ~ TypeTypeArguments?
+    ~ TypeImplementsArguments?
 }
 
-TypeTypeArguments = {
+TypeImplementsArguments = {
       TypeGenericArguments
-    | TypeGenericFunctionArguments
-    | TypeGenericTupleArguments
+    | TypeTupleArguments
+    | TypeFunctionArguments
 }
 
 TypeGenericArguments = {
@@ -398,16 +397,16 @@ TypeGenericArgument = {
     | ( Infer ~ Identifier )
 }
 
-TypeGenericTupleArguments = {
+TypeTupleArguments = {
       "("
     ~ (
-          TypeGenericTupleArgument
-        ~ ( "," ~ TypeGenericTupleArgument )*
+          TypeTupleArgument
+        ~ ( "," ~ TypeTupleArgument )*
       )?
     ~ ")"
 }
 
-TypeGenericTupleArgument = {
+TypeTupleArgument = {
       Underscore
     | FullyQualifiedName
     | ( Infer ~ Identifier )
@@ -415,120 +414,13 @@ TypeGenericTupleArgument = {
     | ( Ellipsis ~ Infer ~ Identifier )
 }
 
-TypeGenericFunctionArguments = {
-      TypeGenericTupleArguments
-    ~ TypeGenericArguments?
-    ~ TypeFunctionReturnType
-}
-
-TypeFunctionReturnType = {
-      "->"
-    ~ ( Void | FullyQualifiedName )
-    ~ RefList?
-}
-
-// Interface
-
-InterfaceGenericParametersAndInputs = {
-      GenericParameters ~ InputParameters?
-    | TupleGenericParameters
-    | FunctionGenericParameters ~ FunctionInputParameters?
-    | InputParameters
-}
-
-InterfaceFunction = {
-      (
-          Static
-        | Cons
-        | ( Mut ~ Ref? )
-      )?
-    ~ Fn
-    ~ GenericParameters?
-    ~ Identifier
-    ~ Parameters
+TypeFunctionArguments = {
+      TypeGenericArguments?
+    ~ TypeTupleArguments
     ~ ReturnType
-    ~ WhereGuards?
-}
-
-InterfaceDefaultFunction = {
-      Def
-    ~ (
-          Static
-        | Cons
-        | ( Mut ~ Ref? )
-      )?
-    ~ Fn
-    ~ GenericParameters?
-    ~ Identifier
-    ~ Parameters
-    ~ ReturnType
-    ~ WhereGuards?
-    ~ FunctionBody
-}
-
-InterfaceOperatorFunction = {
-      (
-          Cons
-        | ( Mut ~ Ref? )
-      )?
-    ~ Op
-    ~ Operator
-    ~ Parameters
-    ~ ReturnType
-    ~ RefList?
-    ~ WhereGuards? // TODO: decide if we want this for interface op functions
-}
-
-InterfaceDefaultOperatorFunction = {
-      Def
-    ~ (
-          Cons
-        | ( Mut ~ Ref? )
-      )?
-    ~ Op
-    ~ Operator
-    ~ Parameters
-    ~ ReturnType
-    ~ RefList?
-    ~ WhereGuards?
-    ~ FunctionBody
-}
-
-// Class constructs
-
-ClassConstructor = {
-      "("
-    ~ DataMember
-    ~ ( "," ~ DataMember )*
-    ~ ")"
-}
-
-DataMember = {
-      Property
-    | Field
-}
-
-Property = {
-      Mut?
-    ~ Identifier
-    ~ ":"
-    ~ TypeUse
-}
-
-Field = {
-      Mut?
-    ~ Fld
-    ~ Identifier
-    ~ ":"
-    ~ TypeUse
 }
 
 // Function constructs
-FunctionModifier = {
-      Static
-    | Cons
-    | Mut? ~ Ref?
-}
 
 FunctionDefinition = {
       Pub?
@@ -562,30 +454,68 @@ PlatformFunction = {
     ~ ReturnType
 }
 
-Parameters = {
-      "("
-    ~ (
-          Parameter
-        ~ ( "," ~ Parameter )*
+InterfaceFunction = {
+      (
+          Static
+        | Cons
+        | ( Mut ~ Ref? )
       )?
-    ~ ")"
+    ~ Fn
+    ~ GenericParameters?
+    ~ Identifier
+    ~ Parameters
+    ~ ReturnType
 }
 
-Parameter = {
-      Identifier
-    ~ ":"
-    ~ TypeUse
+InterfaceDefaultFunction = {
+      Def
+    ~ (
+          Static
+        | Cons
+        | ( Mut ~ Ref? )
+      )?
+    ~ Fn
+    ~ GenericParameters?
+    ~ Identifier
+    ~ Parameters
+    ~ ReturnType
+    ~ FunctionBody
 }
 
-ReturnType = {
-      "->"
-    ~ ( Void | TypeUse )
+InterfaceOperatorFunction = {
+      (
+          Cons
+        | ( Mut ~ Ref? )
+      )?
+    ~ Op
+    ~ Operator
+    ~ Parameters
+    ~ ReturnType
+}
+
+InterfaceDefaultOperatorFunction = {
+      Def
+    ~ (
+          Cons
+        | ( Mut ~ Ref? )
+      )?
+    ~ Op
+    ~ Operator
+    ~ Parameters
+    ~ ReturnType
     ~ RefList?
+    ~ FunctionBody
+}
+
+FunctionModifier = {
+      Static
+    | Cons
+    | Mut? ~ Ref?
 }
 
 FunctionBody = {
       FunctionEqualsBody
-    | FunctionBlockBody
+    | BlockStatement
     | FunctionAliasBody
 }
 
@@ -594,29 +524,62 @@ FunctionEqualsBody = {
     ~ Expression
 }
 
-FunctionBlockBody = {
-      "{"
-    ~ Statement*
-    ~ "}"
-}
-
 FunctionAliasBody = {
       "alias"
     ~ Identifier
 }
 
+// Class constructs
+
+ClassConstructor = {
+      "("
+    ~ DataMember
+    ~ ( "," ~ DataMember )*
+    ~ ")"
+}
+
+DataMember = {
+      Property
+    | Field
+}
+
+Property = {
+      Mut?
+    ~ Identifier
+    ~ ":"
+    ~ TypeUse
+}
+
+Field = {
+      Mut?
+    ~ Fld
+    ~ Identifier
+    ~ ":"
+    ~ TypeUse
+}
+
 // Statements
 
 BlockStatement = {
       "{"
     ~ Statement*
+    ~ Expression?
     ~ "}"
 }
 
 Statement = {
+      (
           BlockStatement
         | VariableDeclaration
-    | AssignmentExpression
+        | AssignmentStatement
+        | CallStatement
+        | ReturnStatement
+        | IfStatement
+        | IfElseStatement
+        | WhileStatement
+        | ForStatement
+      )?
+    ~ Semicolon
 }
 
 VariableDeclaration = {
@@ -627,26 +590,76 @@ VariableDeclaration = {
     ~ ( "=" ~ Expression )?
 }
 
+AssignmentStatement = {
+      Expression
+    ~ "="
+    ~ Expression
+}
+
+CallStatement = { PrimaryExpression }
+
+ReturnStatement = {
+      Return
+    ~ Expression?
+}
+
+IfStatement = {
+      If
+    ~ Expression
+    ~ BlockStatement
+}
+
+IfElseStatement = {
+      If
+    ~ Expression
+    ~ BlockStatement
+    ~ ( Else ~ IfStatement )*
+    ~ Else
+    ~ BlockStatement
+}
+
+WhileStatement = {
+      While
+    ~ Expression
+    ~ BlockStatement
+}
+
+ForStatement = {
+      For
+    ~ Expression
+    ~ In
+    ~ Expression
+    ~ BlockStatement
+}
+
 // Expressions
 
-Expression = { OrExpression }
+Expression = {
+      TernaryExpression
+    | OrExpression
+}
+
+TernaryExpression = {
+      ( OrExpression | ParenthesizedExpression )
+    ~ "?"
+    ~ Expression
+    ~ ":"
+    ~ Expression
+}
 
 OrExpression = {
       AndExpression
-    ~ ( Or ~ Expression )*
+    ~ ( Or ~ Expression )?
 }
 
 AndExpression = {
       EqualityExpression
-    ~ ( And ~ Expression )*
+    ~ ( And ~ Expression )?
 }
 
 EqualityExpression = {
       ComparisonExpression
-    ~ (
-          ( EqualTo | NotEqualTo )
-        ~ Expression
-      )*
+    ~ ( ( EqualTo | NotEqualTo ) ~ Expression )?
 }
 
 ComparisonExpression = {
@@ -654,7 +667,12 @@ ComparisonExpression = {
     ~ (
           ( Greater | Less | GreaterEqual | LessEqual )
         ~ Expression
-      )*
+      )?
+}
+
+ShiftExpression = {
+      AdditiveExpression
+    ~ ( ( LeftShift | RightShift ) ~ Expression )?
 }
 
 AdditiveExpression = {
@@ -662,33 +680,38 @@ AdditiveExpression = {
     ~ (
           ( Add | Subtract )
         ~ Expression
-      )*
+      )?
 }
 
 MultiplicativeExpression = {
-      SpreadExpression
+      UnaryExpression
     ~ (
           ( Multiply | Divide | Modulo )
         ~ Expression
-      )*
-}
-
-SpreadExpression = {
-      UnaryExpression
-    ~ Spread
-    ~ Expression
+      )?
 }
 
 UnaryExpression = {
-      ( Not | Negative )*
+      ( 
+          Spread
+        | ( Borrow ~ Mut )
+        | Borrow
+        | Mut
+        | Not
+        | Negative
+      )*
     ~ PrimaryExpression
-    ~ ( ( NoParenthesesCall | ParenthesesCall )+ | ( PlusPlus | MinusMinus ) )?
+    ~ ( PlusPlus | MinusMinus )*
 }
 
 PrimaryExpression = {
+      (
           Literal
-    | ObjectAccess
+        | FullyQualifiedName
+        | Closure
         | ParenthesizedExpression
+      )
+    ~ ExpressionSuffix?
 }
 
 ParenthesizedExpression = {
@@ -697,6 +720,18 @@ ParenthesizedExpression = {
     ~ ")"
 }
 
+ExpressionSuffix = {
+      ObjectAccess
+    ~ ( ParenthesesCall ~ ObjectAccess? )*
+    | ( ParenthesesCall ~ ObjectAccess? )+
+}
+
+ObjectAccess = {
+      "."
+    ~ Identifier
+    ~ ( "." ~ Identifier )*
+}
+
 // Calls
 
 ParenthesesCall = {
@@ -704,11 +739,7 @@ ParenthesesCall = {
     ~ "("
     ~ ExpressionList?
     ~ ")"
-}
-
-NoParenthesesCall = {
-      TurboFish?
-    ~ ExpressionList
+    ~ Closure?
 }
 
 TurboFish = {
@@ -721,20 +752,46 @@ ExpressionList = {
     ~ ( "," ~ Expression )*
 }
 
-// Assignment
-AssignmentExpression = {
-      ObjectAccess
-    ~ "="
-    ~ Expression
+// Closure
+
+Closure = {
+      ( Cons | Mut )?
+    ~ Move?
+    ~ ClosureCaptures?
+    ~ "{"
+    ~ ( ClosureParameters? ~ "->" )?
+    ~ Statement*
+    ~ Expression?
+    ~ "}"
 }
 
-// Object
-ObjectAccess = {
-      FullyQualifiedName
-    ~ ( "." ~ Identifier )*
+ClosureParameters = {
+      ClosureParameter
+    ~ ( "," ~ ClosureParameter )*
+}
+
+ClosureParameter = {
+      Identifier
+    ~ ( ":" ~ TypeUse )?
+}
+
+ClosureCaptures = {
+      "|"
+    ~ ClosureCapture
+    ~ ( "," ~ ClosureCapture )*
+    ~ "|"
+}
+
+ClosureCapture = {
+      (
+          Mut
+        | ( Borrow ~ Mut? )*
+      )?
+    ~ Identifier
 }
 
 // Literals
+
 Literal = {
       NumberLiteral
     | StringLiteral
@@ -742,9 +799,9 @@ Literal = {
 }
 
 NumberLiteral = {
-      LongLiteral
+      DoubleLiteral
+    | LongLiteral
     | IntLiteral
-    | DoubleLiteral
 }
 
 IntLiteral = { NumberBase }
@@ -754,18 +811,21 @@ LongLiteral = ${ NumberBase ~ "L" }
 DoubleLiteral = ${ DecimalBase ~ "." ~ Digit+ }
 
 NumberBase = {
-      DecimalBase
-    | BinaryBase
+      BinaryBase
     | HexadecimalBase
+    | DecimalBase
 }
 
-DecimalBase = @{ DecimalStartDigit ~ Digit* }
+DecimalBase = @{
+      "0"
+    | DecimalStartDigit ~ Digit*
+}
 
-BinaryBase = @{ "0b" ~ Digit* }
+BinaryBase = @{ "0b" ~ Digit+ }
 
 DecimalStartDigit = { '1'..'9' }
 
-Digit = { '0'..'9'+ }
+Digit = @{ '0'..'9'+ }
 
 HexadecimalBase = @{ "0x" ~ HexadecimalDigit+ }