Accessors

For name.value lookups

schala-lang/language/src/ast/mod.rs

@@ -196,6 +196,7 @@ pub enum ExpressionKind {
     WhileExpression { condition: Option<Box<Expression>>, body: Block },
     ForExpression { enumerators: Vec<Enumerator>, body: Box<ForBody> },
     Lambda { params: Vec<FormalParam>, type_anno: Option<TypeIdentifier>, body: Block },
+    Access { name: Rc<String>, expr: Box<Expression> },
     ListLiteral(Vec<Expression>),
 }
 

schala-lang/language/src/ast/visitor.rs

@@ -128,6 +128,9 @@ pub fn walk_expression<V: ASTVisitor>(v: &mut V, expr: &Expression) {
             Lambda { params: _, type_anno: _, body } => {
                 walk_block(v, body);
             }
+            Access { name: _, expr } => {
+                walk_expression(v, expr);
+            }
             ListLiteral(exprs) =>
                 for expr in exprs {
                     walk_expression(v, expr);

schala-lang/language/src/ast/visualize.rs

@@ -120,6 +120,7 @@ fn render_expression(expr: &Expression, indent: usize, buf: &mut String) {
             newline(buf);
             do_indent(indent, buf);
         }
+        Access { .. } => buf.push_str("<access-expr>"),
         ListLiteral(..) => buf.push_str("<list-literal>"),
     }
     buf.push(')');

schala-lang/language/src/parsing/mod.rs

@@ -166,29 +166,28 @@
 //!
 //! module := 'module' IDENTIFIER '{' statement* '}'
 //! ```
-mod test;
 mod new_tests;
+mod test;
 
 use std::rc::Rc;
 
-use crate::tokenizing::*;
-use crate::tokenizing::Kw::*;
-use crate::tokenizing::TokenKind::*;
-use crate::tokenizing::Location;
-
-use crate::ast::*;
-use crate::identifier::IdStore;
+use crate::{
+    ast::*,
+    identifier::IdStore,
+    tokenizing::{Kw::*, Location, TokenKind::*, *},
+};
 
 /// Represents a parsing error
 #[derive(Debug)]
 pub struct ParseError {
     pub production_name: Option<String>,
     pub msg: String,
-  pub token: Token
+    pub token: Token,
 }
 
 impl ParseError {
-  fn new_with_token<T, M>(msg: M, token: Token) -> ParseResult<T> where M: Into<String> {
+    fn new_with_token<T, M>(msg: M, token: Token) -> ParseResult<T>
+    where M: Into<String> {
         Err(ParseError { msg: msg.into(), token, production_name: None })
     }
 }
@@ -212,15 +211,14 @@ pub struct Parser {
     id_store: IdStore<ASTItem>,
 }
 
-
 struct ParserRestrictions {
-  no_struct_literal: bool
+    no_struct_literal: bool,
 }
 
 struct TokenHandler {
     tokens: Vec<Token>,
     idx: usize,
-  end_of_file: Location
+    end_of_file: Location,
 }
 
 impl TokenHandler {
@@ -240,15 +238,24 @@ impl TokenHandler {
         self.peek_n(n).kind
     }
     fn peek(&mut self) -> Token {
-    self.tokens.get(self.idx).cloned().unwrap_or(Token { kind: TokenKind::EOF, location: self.end_of_file })
+        self.tokens
+            .get(self.idx)
+            .cloned()
+            .unwrap_or(Token { kind: TokenKind::EOF, location: self.end_of_file })
     }
     /// calling peek_n(0) is the same thing as peek()
     fn peek_n(&mut self, n: usize) -> Token {
-    self.tokens.get(self.idx + n).cloned().unwrap_or(Token { kind: TokenKind::EOF, location: self.end_of_file })
+        self.tokens
+            .get(self.idx + n)
+            .cloned()
+            .unwrap_or(Token { kind: TokenKind::EOF, location: self.end_of_file })
     }
     fn next(&mut self) -> Token {
         self.idx += 1;
-    self.tokens.get(self.idx - 1).cloned().unwrap_or(Token { kind: TokenKind::EOF, location: self.end_of_file })
+        self.tokens
+            .get(self.idx - 1)
+            .cloned()
+            .unwrap_or(Token { kind: TokenKind::EOF, location: self.end_of_file })
     }
 }
 
@@ -296,7 +303,9 @@ impl Parser {
 }
 
 macro_rules! print_token_pattern {
-  ($tokenpattern:pat) => { stringify!($tokenpattern) }
+    ($tokenpattern:pat) => {
+        stringify!($tokenpattern)
+    };
 }
 
 macro_rules! expect {
@@ -322,8 +331,7 @@ macro_rules! delimited {
     ($self:expr, $start:pat, $parse_fn:ident, $delim:pat, $end:pat) => {
         delimited!($self, $start, $parse_fn, $delim, $end, true)
     };
-  ($self:expr, $start:pat, $parse_fn:ident, $delim:pat, $end:pat, $strictness:expr) => {
-    {
+    ($self:expr, $start:pat, $parse_fn:ident, $delim:pat, $end:pat, $strictness:expr) => {{
         expect!($self, $start);
         let mut acc = vec![];
         loop {
@@ -331,29 +339,34 @@ macro_rules! delimited {
             match peek.get_kind() {
                 $end | EOF => break,
                 Newline | Semicolon => {
-              $self.token_handler.next(); continue;
-          },
+                    $self.token_handler.next();
+                    continue;
+                }
                 _ => (),
             }
             if !$strictness {
                 match peek.get_kind() {
-            $delim => { $self.token_handler.next(); continue },
-            _ => ()
+                    $delim => {
+                        $self.token_handler.next();
+                        continue;
+                    }
+                    _ => (),
                 }
             }
             acc.push($self.$parse_fn()?);
             match $self.token_handler.peek().get_kind() {
-          $delim => { $self.token_handler.next(); continue },
+                $delim => {
+                    $self.token_handler.next();
+                    continue;
+                }
                 _ if $strictness => break,
                 _ => continue,
             };
         }
         expect!($self, $end);
         acc
+    }};
 }
-  };
-}
-
 
 impl Parser {
     /// `program := (statement delimiter)* EOF`
@@ -367,10 +380,8 @@ impl Parser {
                 Newline | Semicolon => {
                     self.token_handler.next();
                     continue;
-        },
-        _ => statements.push(
-          self.statement()?
-        ),
+                }
+                _ => statements.push(self.statement()?),
             }
         }
         Ok(AST { id: self.id_store.fresh(), statements: statements.into() })
@@ -383,20 +394,19 @@ impl Parser {
         let tok = self.token_handler.peek();
         let kind = match tok.get_kind() {
             AtSign => self.annotation().map(StatementKind::Declaration),
-      Keyword(Type) => self.type_declaration().map(|decl| { StatementKind::Declaration(decl) }),
-      Keyword(Func)=> self.func_declaration().map(|func| { StatementKind::Declaration(func) }),
+            Keyword(Type) => self.type_declaration().map(|decl| StatementKind::Declaration(decl)),
+            Keyword(Func) => self.func_declaration().map(|func| StatementKind::Declaration(func)),
             Keyword(Let) => self.binding_declaration().map(StatementKind::Declaration),
             Keyword(Interface) => self.interface_declaration().map(StatementKind::Declaration),
             Keyword(Impl) => self.impl_declaration().map(StatementKind::Declaration),
             Keyword(Import) => self.import_declaration().map(StatementKind::Import),
             Keyword(Module) => self.module_declaration().map(StatementKind::Module),
-      _ => self.expression().map(|expr| { StatementKind::Expression(expr) } ),
+            _ => self.expression().map(|expr| StatementKind::Expression(expr)),
         }?;
         let id = self.id_store.fresh();
         Ok(Statement { kind, id, location: tok.location })
     }
 
-
     #[recursive_descent_method]
     fn annotation(&mut self) -> ParseResult<Declaration> {
         expect!(self, AtSign);
@@ -407,10 +417,7 @@ impl Parser {
             vec![]
         };
 
-      Ok(Declaration::Annotation {
-          name,
-          arguments,
-      })
+        Ok(Declaration::Annotation { name, arguments })
     }
 
     #[recursive_descent_method]
@@ -463,19 +470,16 @@ impl Parser {
             LParen => {
                 let tuple_members = delimited!(self, LParen, type_name, Comma, RParen);
                 VariantKind::TupleStruct(tuple_members)
-      },
+            }
             LCurlyBrace => {
                 println!("ARAH");
-        let typed_identifier_list = delimited!(self, LCurlyBrace, typed_identifier, Comma, RCurlyBrace);
+                let typed_identifier_list =
+                    delimited!(self, LCurlyBrace, typed_identifier, Comma, RCurlyBrace);
                 VariantKind::Record(typed_identifier_list)
-      },
-      _ => VariantKind::UnitStruct
+            }
+            _ => VariantKind::UnitStruct,
         };
-    Ok(Variant {
-        id: self.id_store.fresh(),
-        name,
-        kind
-    })
+        Ok(Variant { id: self.id_store.fresh(), name, kind })
     }
 
     #[recursive_descent_method]
@@ -505,8 +509,8 @@ impl Parser {
                 let name = s;
                 self.token_handler.next();
                 (name, true)
-      },
-      _ => (self.identifier()?, false)
+            }
+            _ => (self.identifier()?, false),
         };
         let params = self.formal_param_list()?;
         let type_anno = match self.token_handler.peek_kind() {
@@ -518,7 +522,8 @@ impl Parser {
 
     #[recursive_descent_method]
     fn nonempty_func_body(&mut self) -> ParseResult<Vec<Statement>> {
-    let statements = delimited!(self, LCurlyBrace, statement, Newline | Semicolon, RCurlyBrace, nonstrict);
+        let statements =
+            delimited!(self, LCurlyBrace, statement, Newline | Semicolon, RCurlyBrace, nonstrict);
         Ok(statements)
     }
 
@@ -532,14 +537,14 @@ impl Parser {
         let name = self.identifier()?;
         let anno = match self.token_handler.peek_kind() {
             Colon => Some(self.type_anno()?),
-      _ => None
+            _ => None,
         };
         let default = match self.token_handler.peek_kind() {
             Equals => {
                 self.token_handler.next();
                 Some(self.expression()?)
-      },
-      _ => None
+            }
+            _ => None,
         };
         Ok(FormalParam { name, anno, default })
     }
@@ -552,14 +557,11 @@ impl Parser {
                 self.token_handler.next();
                 false
             }
-      _ => true
+            _ => true,
         };
         let name = self.identifier()?;
-    let type_anno = if let Colon = self.token_handler.peek_kind() {
-      Some(self.type_anno()?)
-    } else {
-      None
-    };
+        let type_anno =
+            if let Colon = self.token_handler.peek_kind() { Some(self.type_anno()?) } else { None };
 
         expect!(self, Equals);
         let expr = self.expression()?;
@@ -595,8 +597,11 @@ impl Parser {
         Ok(match (first, second) {
             (interface_name, Some(type_name)) =>
                 Declaration::Impl { type_name, interface_name: Some(interface_name), block },
-      (type_singleton_name, None) =>
-        Declaration::Impl { type_name: TypeIdentifier::Singleton(type_singleton_name), interface_name: None, block }
+            (type_singleton_name, None) => Declaration::Impl {
+                type_name: TypeIdentifier::Singleton(type_singleton_name),
+                interface_name: None,
+                block,
+            },
         })
     }
 
@@ -610,7 +615,7 @@ impl Parser {
         let mut expr_body = self.precedence_expr(BinOp::min_precedence())?;
         let type_anno = match self.token_handler.peek_kind() {
             Colon => Some(self.type_anno()?),
-      _ => None
+            _ => None,
         };
         if expr_body.type_anno.is_some() {
             return ParseError::new_with_token("Bad parse state encountered", self.token_handler.peek());
@@ -641,7 +646,7 @@ impl Parser {
             params: match self.token_handler.peek_kind() {
                 LAngleBracket => delimited!(self, LAngleBracket, type_name, Comma, RAngleBracket),
                 _ => vec![],
-      }
+            },
         })
     }
 
@@ -670,10 +675,13 @@ impl Parser {
             let operation = match BinOp::from_sigil_token(&next_tok.kind) {
                 Some(sigil) => sigil,
                 //TODO I think I can fix this unreachable
-        None => unreachable!()
+                None => unreachable!(),
             };
             let rhs = self.precedence_expr(new_precedence)?;
-      lhs = Expression::new(self.id_store.fresh(), ExpressionKind::BinExp(operation, Box::new(lhs), Box::new(rhs)));
+            lhs = Expression::new(
+                self.id_store.fresh(),
+                ExpressionKind::BinExp(operation, Box::new(lhs), Box::new(rhs)),
+            );
         }
         self.parse_level -= 1;
         Ok(lhs)
@@ -691,10 +699,10 @@ impl Parser {
                 let prefix_op = PrefixOp::from_sigil(sigil.as_str());
                 Ok(Expression::new(
                     self.id_store.fresh(),
-          ExpressionKind::PrefixExp(prefix_op, Box::new(expr))
+                    ExpressionKind::PrefixExp(prefix_op, Box::new(expr)),
                 ))
-      },
-      _ => self.extended_expr()
+            }
+            _ => self.extended_expr(),
         }
     }
 
@@ -705,24 +713,34 @@ impl Parser {
             //TODO need a next non whitespace
             let next = self.token_handler.peek_kind();
             match next {
-              Period => unimplemented!(),
+                Period => {
+                    self.token_handler.next();
+                    let name = self.identifier()?;
+                    expression = Expression::new(
+                        self.id_store.fresh(),
+                        ExpressionKind::Access { name, expr: Box::new(expression) },
+                    );
+                }
                 LSquareBracket => {
                     let indexers = delimited!(self, LSquareBracket, expression, Comma, RSquareBracket);
                     if indexers.is_empty() {
-                      return ParseError::new_with_token("Empty index expressions are not allowed", self.token_handler.peek());
+                        return ParseError::new_with_token(
+                            "Empty index expressions are not allowed",
+                            self.token_handler.peek(),
+                        );
+                    }
+                    expression = Expression::new(
+                        self.id_store.fresh(),
+                        ExpressionKind::Index { indexee: Box::new(expression), indexers },
+                    );
                 }
-                  expression = Expression::new(self.id_store.fresh(), ExpressionKind::Index {
-                      indexee: Box::new(expression),
-                      indexers,
-                  });
-              },
                 LParen => {
                     let arguments = delimited!(self, LParen, invocation_argument, Comma, RParen);
-                  expression = Expression::new(self.id_store.fresh(), ExpressionKind::Call {
-                      f: Box::new(expression),
-                      arguments,
-                  });
-              },
+                    expression = Expression::new(
+                        self.id_store.fresh(),
+                        ExpressionKind::Call { f: Box::new(expression), arguments },
+                    );
+                }
                 _ => break,
             }
         }
@@ -735,22 +753,20 @@ impl Parser {
             Underscore => {
                 self.token_handler.next();
                 InvocationArgument::Ignored
-      },
-      Identifier(s) => {
-        match self.token_handler.peek_kind_n(1) {
+            }
+            Identifier(s) => match self.token_handler.peek_kind_n(1) {
                 Equals => {
                     self.token_handler.next();
                     self.token_handler.next();
                     let expr = self.expression()?;
                     InvocationArgument::Keyword { name: s, expr }
-          },
+                }
                 _ => {
                     let expr = self.expression()?;
                     InvocationArgument::Positional(expr)
                 }
-        }
             },
-      _ => InvocationArgument::Positional(self.expression()?)
+            _ => InvocationArgument::Positional(self.expression()?),
         })
     }
 
@@ -760,12 +776,18 @@ impl Parser {
         Ok(if let LSquareBracket = self.token_handler.peek_kind() {
             let indexers = delimited!(self, LSquareBracket, expression, Comma, RSquareBracket);
             if indexers.is_empty() {
-        return ParseError::new_with_token("Empty index expressions are not allowed", self.token_handler.peek());
+                return ParseError::new_with_token(
+                    "Empty index expressions are not allowed",
+                    self.token_handler.peek(),
+                );
             }
-      Expression::new(self.id_store.fresh(), ExpressionKind::Index {
+            Expression::new(
+                self.id_store.fresh(),
+                ExpressionKind::Index {
                     indexee: Box::new(Expression::new(self.id_store.fresh(), primary.kind)),
                     indexers,
-      })
+                },
+            )
         } else {
             primary
         })
@@ -806,7 +828,8 @@ impl Parser {
             _ => None,
         };
         let body = self.nonempty_func_body()?.into();
-    Ok(Expression::new(self.id_store.fresh(), ExpressionKind::Lambda { params, type_anno, body })) //TODO need to handle types somehow
+        Ok(Expression::new(self.id_store.fresh(), ExpressionKind::Lambda { params, type_anno, body }))
+        //TODO need to handle types somehow
     }
 
     #[recursive_descent_method]
@@ -829,7 +852,7 @@ impl Parser {
             match inner.len() {
                 0 => Ok(Expression::new(self.id_store.fresh(), TupleLiteral(vec![]))),
                 1 => Ok(inner.pop().unwrap()),
-        _ => Ok(Expression::new(self.id_store.fresh(), TupleLiteral(inner)))
+                _ => Ok(Expression::new(self.id_store.fresh(), TupleLiteral(inner))),
             }
         };
         self.restrictions.no_struct_literal = old_struct_value;
@@ -845,8 +868,8 @@ impl Parser {
             LCurlyBrace if !self.restrictions.no_struct_literal => {
                 let fields = self.record_block()?;
                 Expression::new(self.id_store.fresh(), NamedStruct { name: qualified_identifier, fields })
-      },
-      _ => Expression::new(self.id_store.fresh(), Value(qualified_identifier))
+            }
+            _ => Expression::new(self.id_store.fresh(), Value(qualified_identifier)),
         })
     }
 
@@ -934,11 +957,17 @@ impl Parser {
         loop {
             match self.token_handler.peek_kind() {
                 RCurlyBrace | EOF => break,
-        Semicolon | Newline => { self.token_handler.next(); continue},
+                Semicolon | Newline => {
+                    self.token_handler.next();
+                    continue;
+                }
                 _ => {
                     cond_arms.push(self.cond_arm()?);
                     match self.token_handler.peek_kind() {
-            Comma | Semicolon | Newline => { self.token_handler.next(); continue; },
+                        Comma | Semicolon | Newline => {
+                            self.token_handler.next();
+                            continue;
+                        }
                         _ => break,
                     }
                 }
@@ -969,15 +998,13 @@ impl Parser {
             Keyword(Kw::Is) => {
                 self.token_handler.next();
                 Condition::Pattern(self.pattern()?)
-      },
+            }
             ref tok if BinOp::from_sigil_token(tok).is_some() => {
                 let op = BinOp::from_sigil_token(&self.token_handler.next().kind).unwrap();
                 let expr = self.expression()?;
                 Condition::TruncatedOp(op, expr)
-      },
-      _ => {
-        Condition::Expression(self.expression()?)
-      },
+            }
+            _ => Condition::Expression(self.expression()?),
         })
     }
 
@@ -987,8 +1014,8 @@ impl Parser {
             Keyword(Kw::If) => {
                 self.token_handler.next();
                 Some(self.expression()?)
-      },
-      _ => None
+            }
+            _ => None,
         })
     }
 
@@ -1012,17 +1039,15 @@ impl Parser {
                     LCurlyBrace => {
                         let members = delimited!(self, LCurlyBrace, record_pattern_entry, Comma, RCurlyBrace);
                         Pattern::Record(qualified_identifier, members)
-          },
+                    }
                     LParen => {
                         let members = delimited!(self, LParen, pattern, Comma, RParen);
                         Pattern::TupleStruct(qualified_identifier, members)
-          },
-          _ => {
-            Pattern::VarOrName(qualified_identifier)
-          },
                     }
-      },
-      _ => self.pattern_literal()?
+                    _ => Pattern::VarOrName(qualified_identifier),
+                }
+            }
+            _ => self.pattern_literal()?,
         })
     }
 
@@ -1033,22 +1058,22 @@ impl Parser {
             Keyword(Kw::True) => {
                 self.token_handler.next();
                 Pattern::Literal(PatternLiteral::BoolPattern(true))
-      },
+            }
             Keyword(Kw::False) => {
                 self.token_handler.next();
                 Pattern::Literal(PatternLiteral::BoolPattern(false))
-      },
+            }
             StrLiteral { s, .. } => {
                 self.token_handler.next();
                 Pattern::Literal(PatternLiteral::StringPattern(s))
-      },
+            }
             DigitGroup(_) | HexLiteral(_) | BinNumberSigil | Period => self.signed_number_literal()?,
             Operator(ref op) if **op == "-" => self.signed_number_literal()?,
             Underscore => {
                 self.token_handler.next();
                 Pattern::Ignored
-      },
-      other => return ParseError::new_with_token(format!("{:?} is not a valid Pattern", other), tok)
+            }
+            other => return ParseError::new_with_token(format!("{:?} is not a valid Pattern", other), tok),
         })
     }
 
@@ -1058,8 +1083,8 @@ impl Parser {
             Operator(ref op) if **op == "-" => {
                 self.token_handler.next();
                 true
-      },
-      _ => false
+            }
+            _ => false,
         };
         let Expression { kind, .. } = self.number_literal()?;
         Ok(Pattern::Literal(PatternLiteral::NumPattern { neg, num: kind }))
@@ -1073,8 +1098,8 @@ impl Parser {
                 expect!(self, Colon);
                 let pat = self.pattern()?;
                 (name, pat)
-      },
-      _ => (name.clone(), Pattern::Literal(PatternLiteral::StringPattern(name)))
+            }
+            _ => (name.clone(), Pattern::Literal(PatternLiteral::StringPattern(name))),
         })
     }
 
@@ -1091,7 +1116,11 @@ impl Parser {
             LCurlyBrace => self.block(),
             _ => {
                 let expr = self.expression()?;
-        let s = Statement { id: self.id_store.fresh(), location: tok.location, kind: StatementKind::Expression(expr) };
+                let s = Statement {
+                    id: self.id_store.fresh(),
+                    location: tok.location,
+                    kind: StatementKind::Expression(expr),
+                };
                 Ok(s.into())
             }
         }
@@ -1151,13 +1180,14 @@ impl Parser {
         let tok = self.token_handler.peek();
         Ok(match tok.get_kind() {
             LCurlyBrace => {
-        let statements = delimited!(self, LCurlyBrace, statement, Newline | Semicolon, RCurlyBrace, nonstrict);
+                let statements =
+                    delimited!(self, LCurlyBrace, statement, Newline | Semicolon, RCurlyBrace, nonstrict);
                 StatementBlock(statements.into())
-      },
+            }
             Keyword(Kw::Return) => {
                 self.token_handler.next();
                 MonadicReturn(self.expression()?)
-      },
+            }
             _ => return ParseError::new_with_token("for expressions must end in a block or 'return'", tok),
         })
     }
@@ -1182,12 +1212,12 @@ impl Parser {
                 self.token_handler.next();
                 let id = self.id_store.fresh();
                 Ok(Expression::new(id, BoolLiteral(true)))
-      },
+            }
             Keyword(Kw::False) => {
                 self.token_handler.next();
                 let id = self.id_store.fresh();
                 Ok(Expression::new(id, BoolLiteral(false)))
-      },
+            }
             StrLiteral { s, .. } => {
                 self.token_handler.next();
                 let id = self.id_store.fresh();
@@ -1214,12 +1244,12 @@ impl Parser {
                 let digits = self.digits()?;
                 let n = parse_binary(digits, tok)?;
                 Ok(Expression::new(self.id_store.fresh(), NatLiteral(n)))
-      },
+            }
             HexLiteral(text) => {
                 let digits: String = text.chars().filter(|c| c.is_digit(16)).collect();
                 let n = parse_hex(digits, tok)?;
                 Ok(Expression::new(self.id_store.fresh(), NatLiteral(n)))
-      },
+            }
             _ => return ParseError::new_with_token("Expected '0x' or '0b'", tok),
         }
     }
@@ -1236,12 +1266,12 @@ impl Parser {
             match digits.parse::<f64>() {
                 Ok(f) => Ok(Expression::new(self.id_store.fresh(), FloatLiteral(f))),
                 Err(e) => ParseError::new_with_token(format!("Float failed to parse with error: {}", e), tok),
-
             }
         } else {
             match digits.parse::<u64>() {
                 Ok(d) => Ok(Expression::new(self.id_store.fresh(), NatLiteral(d))),
-        Err(e) => ParseError::new_with_token(format!("Integer failed to parse with error: {}", e), tok),
+                Err(e) =>
+                    ParseError::new_with_token(format!("Integer failed to parse with error: {}", e), tok),
             }
         }
     }
@@ -1251,8 +1281,14 @@ impl Parser {
         let mut ds = String::new();
         loop {
             match self.token_handler.peek_kind() {
-        Underscore => { self.token_handler.next(); continue; },
-        DigitGroup(ref s) => { self.token_handler.next(); ds.push_str(s)},
+                Underscore => {
+                    self.token_handler.next();
+                    continue;
+                }
+                DigitGroup(ref s) => {
+                    self.token_handler.next();
+                    ds.push_str(s)
+                }
                 _ => break,
             }
         }
@@ -1278,19 +1314,15 @@ impl Parser {
             LCurlyBrace => {
                 let names = delimited!(self, LCurlyBrace, identifier, Comma, RCurlyBrace);
                 ImportedNames::List(names)
-      },
+            }
             Operator(ref s) if **s == "*" => {
                 self.token_handler.next();
                 ImportedNames::All
-      },
-      _ => ImportedNames::LastOfPath
+            }
+            _ => ImportedNames::LastOfPath,
         };
 
-    Ok(ImportSpecifier {
-      id: self.id_store.fresh(),
-      path_components,
-      imported_names
-    })
+        Ok(ImportSpecifier { id: self.id_store.fresh(), path_components, imported_names })
     }
 
     #[recursive_descent_method]
@@ -1299,11 +1331,11 @@ impl Parser {
             Operator(ref s) if **s == "*" => {
                 self.token_handler.next();
                 ImportedNames::All
-      },
+            }
             LCurlyBrace => {
                 let names = delimited!(self, LCurlyBrace, identifier, Comma, RCurlyBrace);
                 ImportedNames::List(names)
-      },
+            }
             _ => return ParseError::new_with_token("Expected '{{' or '*'", self.token_handler.peek()),
         })
     }
@@ -1324,11 +1356,15 @@ fn parse_binary(digits: String, tok: Token) -> ParseResult<u64> {
         match d {
             '1' => result += multiplier,
             '0' => (),
-      _ => return ParseError::new_with_token("Encountered a character not '1' or '0 while parsing a binary literal", tok),
+            _ =>
+                return ParseError::new_with_token(
+                    "Encountered a character not '1' or '0 while parsing a binary literal",
+                    tok,
+                ),
         }
         multiplier = match multiplier.checked_mul(2) {
             Some(m) => m,
-      None => return ParseError::new_with_token("This binary expression will overflow", tok)
+            None => return ParseError::new_with_token("This binary expression will overflow", tok),
         }
     }
     Ok(result)
@@ -1344,9 +1380,8 @@ fn parse_hex(digits: String, tok: Token) -> ParseResult<u64> {
         }
         multiplier = match multiplier.checked_mul(16) {
             Some(m) => m,
-      None => return ParseError::new_with_token("This hex expression will overflow", tok)
+            None => return ParseError::new_with_token("This hex expression will overflow", tok),
         }
     }
     Ok(result)
 }
-

schala-lang/language/src/parsing/new_tests.rs

@@ -203,11 +203,36 @@ fn operators() {
 
 #[test]
 fn accessors() {
-    /*
-    assert_expr!("a.b");
-    assert_expr!("a.b.c.d()");
-    assert_expr!("a.b().c.d()");
-    */
+    use ExpressionKind::*;
+
+    assert_expr!("a.b", expr(Access { name: rc("b"), expr: bx(expr(Value(qn!(a)))) }));
+    assert_expr!(
+        "a.b.c",
+        expr(Access {
+            name: rc("c"),
+            expr: bx(expr(Access { name: rc("b"), expr: bx(expr(Value(qn!(a)))) }))
+        })
+    );
+    assert_expr!(
+        "a.b.c(3)",
+        expr(Call {
+            f: bx(expr(Access {
+                name: rc("c"),
+                expr: bx(expr(Access { name: rc("b"), expr: bx(expr(Value(qn!(a)))) }))
+            })),
+            arguments: vec![InvocationArgument::Positional(expr(NatLiteral(3)))],
+        })
+    );
+    assert_expr!(
+        "a.b().c",
+        expr(Access {
+            name: rc("c"),
+            expr: bx(expr(Call {
+                f: bx(expr(Access { name: rc("b"), expr: bx(expr(Value(qn!(a)))) })),
+                arguments: vec![]
+            }))
+        })
+    );
 }
 
 #[test]

schala-lang/language/src/reduced_ir/mod.rs

@@ -4,7 +4,7 @@ use crate::{
     ast,
     builtin::Builtin,
     symbol_table::{DefId, SymbolSpec, SymbolTable},
-    type_inference::TypeContext,
+    type_inference::{TypeContext, TypeId},
 };
 
 mod test;
@@ -135,23 +135,14 @@ impl<'a, 'b> Reducer<'a, 'b> {
             }),
             NamedStruct { name, fields } => {
                 self.symbol_table.debug();
+                println!("Namedstruct name {} id: {}", name, name.id);
                 let symbol = self.symbol_table.lookup_symbol(&name.id).unwrap();
                 let (tag, type_id) = match symbol.spec() {
                     SymbolSpec::RecordConstructor { tag, members: _, type_id } => (tag, type_id),
                     e => return Expression::ReductionError(format!("Bad symbol for NamedStruct: {:?}", e)),
                 };
 
-                // Eventually, the ReducedIR should decide what field ordering is optimal.
-                // For now, just do it alphabetically.
-                let mut field_order: Vec<String> = self
-                    .type_context
-                    .lookup_record_members(&type_id, tag)
-                    .unwrap()
-                    .iter()
-                    .map(|(field, _type_id)| field)
-                    .cloned()
-                    .collect();
-                field_order.sort_unstable();
+                let field_order = compute_field_orderings(&self.type_context, &type_id, tag).unwrap();
 
                 let mut field_map = HashMap::new();
                 for (name, expr) in fields.iter() {
@@ -179,6 +170,8 @@ impl<'a, 'b> Reducer<'a, 'b> {
             WhileExpression { .. } => Expression::ReductionError("While expr not implemented".to_string()),
             ForExpression { .. } => Expression::ReductionError("For expr not implemented".to_string()),
             ListLiteral { .. } => Expression::ReductionError("ListLiteral expr not implemented".to_string()),
+            Access { name, expr } =>
+                Expression::Access { name: name.as_ref().to_string(), expr: Box::new(self.expression(expr)) },
         }
     }
 
@@ -388,3 +381,21 @@ impl ast::Pattern {
         })
     }
 }
+
+/// Given the type context and a variant, compute what order the fields on it were stored.
+/// This needs to be public until type-checking is fully implemented because the type information
+/// is only available at runtime.
+pub fn compute_field_orderings(
+    type_context: &TypeContext,
+    type_id: &TypeId,
+    tag: u32,
+) -> Option<Vec<String>> {
+    // Eventually, the ReducedIR should decide what field ordering is optimal.
+    // For now, just do it alphabetically.
+
+    let record_members = type_context.lookup_record_members(type_id, tag)?;
+    let mut field_order: Vec<String> =
+        record_members.iter().map(|(field, _type_id)| field).cloned().collect();
+    field_order.sort_unstable();
+    Some(field_order)
+}

schala-lang/language/src/reduced_ir/types.rs

@@ -50,6 +50,7 @@ pub enum Expression {
     Tuple(Vec<Expression>),
     Lookup(Lookup),
     Assign { lval: DefId, rval: Box<Expression> },
+    Access { name: String, expr: Box<Expression> },
     Callable(Callable),
     Call { f: Box<Expression>, args: Vec<Expression> },
     Conditional { cond: Box<Expression>, then_clause: Vec<Statement>, else_clause: Vec<Statement> },

schala-lang/language/src/tree_walk_eval/evaluator.rs

@@ -126,6 +126,28 @@ impl<'a, 'b> Evaluator<'a, 'b> {
             Expression::CaseMatch { box cond, alternatives } =>
                 self.case_match_expression(cond, alternatives)?,
             Expression::ReductionError(e) => return Err(e.into()),
+            Expression::Access { name, box expr } => {
+                let expr = self.expression(expr)?;
+                match expr {
+                    Primitive::Object { items, ordered_fields: Some(ordered_fields), .. } => {
+                        let idx = match ordered_fields.iter().position(|s| s == &name) {
+                            Some(idx) => idx,
+                            None => return Err(format!("Field `{}` not found", name).into()),
+                        };
+
+                        let item = match items.get(idx) {
+                            Some(item) => item,
+                            None => return Err(format!("Field lookup `{}` failed", name).into()),
+                        };
+
+                        item.clone()
+                    }
+                    e =>
+                        return Err(
+                            format!("Trying to do a field lookup on a non-object value: {:?}", e).into()
+                        ),
+                }
+            }
         })
     }
 

schala-lang/language/src/tree_walk_eval/test.rs

@@ -1,6 +1,6 @@
 #![cfg(test)]
-use test_case::test_case;
 use pretty_assertions::assert_eq;
+use test_case::test_case;
 
 use crate::{
     symbol_table::SymbolTable,
@@ -367,3 +367,14 @@ import Option::*
 let x = Some(9); if x is Some(q) then { q } else { 0 }"#;
     eval_assert(source, "9");
 }
+
+#[test]
+fn accessors() {
+    let source = r#"
+type Klewos = Klewos { a: Int, b: String }
+let value = Klewos::Klewos { a: 50, b: "nah" }
+(value.a, value.b)
+    "#;
+
+    eval_assert(source, r#"(50, "nah")"#);
+}