impl tuple ast access

compiler/ast/src/access/mod.rs

@@ -14,11 +14,14 @@
 // You should have received a copy of the GNU General Public License
 // along with the Leo library. If not, see <https://www.gnu.org/licenses/>.
 
-mod member_access;
-pub use member_access::*;
+mod associated_constant_access;
+pub use associated_constant_access::*;
 
 mod associated_function_access;
 pub use associated_function_access::*;
 
-mod associated_constant_access;
-pub use associated_constant_access::*;
+mod member_access;
+pub use member_access::*;
+
+mod tuple_access;
+pub use tuple_access::*;

compiler/ast/src/access/tuple_access.rs

@@ -0,0 +1,40 @@
+// Copyright (C) 2019-2022 Aleo Systems Inc.
+// This file is part of the Leo library.
+
+// The Leo library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// The Leo library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with the Leo library. If not, see <https://www.gnu.org/licenses/>.
+
+use crate::{Expression, Node, PositiveNumber};
+use leo_span::Span;
+
+use serde::{Deserialize, Serialize};
+use std::fmt;
+
+/// An tuple access expression, e.g., `tuple.index`.
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
+pub struct TupleAccess {
+    /// An expression evaluating to some tuple type, e.g., `(5, 2)`.
+    pub tuple: Box<Expression>,
+    /// The index to access in the tuple expression. E.g., `0` for `(5, 2)` would yield `5`.
+    pub index: PositiveNumber,
+    /// The span for the entire expression `tuple.index`.
+    pub span: Span,
+}
+
+impl fmt::Display for TupleAccess {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "{}.{}", self.tuple, self.index)
+    }
+}
+
+crate::simple_node_impl!(TupleAccess);

compiler/ast/src/expressions/access.rs

@@ -27,30 +27,32 @@ pub enum AccessExpression {
     // Array(ArrayAccess),
     // /// An expression accessing a range of an array.
     // ArrayRange(ArrayRangeAccess),
-    /// An expression accessing a field in a structure, e.g., `circuit_var.field`.
-    Member(MemberAccess),
-    // /// Access to a tuple field using its position, e.g., `tuple.1`.
-    // Tuple(TupleAccess),
     /// Access to an associated variable of a circuit e.g `u8::MAX`.
     AssociatedConstant(AssociatedConstant),
     /// Access to an associated function of a circuit e.g `Pedersen64::hash()`.
     AssociatedFunction(AssociatedFunction),
+    /// An expression accessing a field in a structure, e.g., `circuit_var.field`.
+    Member(MemberAccess),
+    /// Access to a tuple field using its position, e.g., `tuple.1`.
+    Tuple(TupleAccess),
 }
 
 impl Node for AccessExpression {
     fn span(&self) -> Span {
         match self {
-            AccessExpression::Member(n) => n.span(),
             AccessExpression::AssociatedConstant(n) => n.span(),
             AccessExpression::AssociatedFunction(n) => n.span(),
+            AccessExpression::Member(n) => n.span(),
+            AccessExpression::Tuple(n) => n.span(),
         }
     }
 
     fn set_span(&mut self, span: Span) {
         match self {
-            AccessExpression::Member(n) => n.set_span(span),
             AccessExpression::AssociatedConstant(n) => n.set_span(span),
             AccessExpression::AssociatedFunction(n) => n.set_span(span),
+            AccessExpression::Member(n) => n.set_span(span),
+            AccessExpression::Tuple(n) => n.set_span(span),
         }
     }
 }
@@ -60,12 +62,10 @@ impl fmt::Display for AccessExpression {
         use AccessExpression::*;
 
         match self {
-            // Array(access) => access.fmt(f),
-            // ArrayRange(access) => access.fmt(f),
-            Member(access) => access.fmt(f),
-            // Tuple(access) => access.fmt(f),
             AssociatedConstant(access) => access.fmt(f),
             AssociatedFunction(access) => access.fmt(f),
+            Member(access) => access.fmt(f),
+            Tuple(access) => access.fmt(f),
         }
     }
 }

compiler/ast/src/passes/reconstructor.rs

@@ -40,7 +40,34 @@ pub trait ExpressionReconstructor {
     }
 
     fn reconstruct_access(&mut self, input: AccessExpression) -> (Expression, Self::AdditionalOutput) {
-        (Expression::Access(input), Default::default())
+        (
+            Expression::Access(match input {
+                AccessExpression::AssociatedFunction(function) => {
+                    AccessExpression::AssociatedFunction(AssociatedFunction {
+                        ty: function.ty,
+                        name: function.name,
+                        args: function
+                            .args
+                            .into_iter()
+                            .map(|arg| self.reconstruct_expression(arg).0)
+                            .collect(),
+                        span: function.span,
+                    })
+                }
+                AccessExpression::Member(member) => AccessExpression::Member(MemberAccess {
+                    inner: Box::new(self.reconstruct_expression(*member.inner).0),
+                    name: member.name,
+                    span: member.span,
+                }),
+                AccessExpression::Tuple(tuple) => AccessExpression::Tuple(TupleAccess {
+                    tuple: Box::new(self.reconstruct_expression(*tuple.tuple).0),
+                    index: tuple.index,
+                    span: tuple.span,
+                }),
+                expr => expr,
+            }),
+            Default::default(),
+        )
     }
 
     fn reconstruct_binary(&mut self, input: BinaryExpression) -> (Expression, Self::AdditionalOutput) {
@@ -55,7 +82,6 @@ pub trait ExpressionReconstructor {
         )
     }
 
-
     fn reconstruct_call(&mut self, input: CallExpression) -> (Expression, Self::AdditionalOutput) {
         (
             Expression::Call(CallExpression {

compiler/ast/src/passes/visitor.rs

@@ -40,7 +40,22 @@ pub trait ExpressionVisitor<'a> {
         }
     }
 
-    fn visit_access(&mut self, _input: &'a AccessExpression, _additional: &Self::AdditionalInput) -> Self::Output {
+    fn visit_access(&mut self, input: &'a AccessExpression, additional: &Self::AdditionalInput) -> Self::Output {
+        match input {
+            AccessExpression::AssociatedFunction(function) => {
+                function.args.iter().for_each(|arg| {
+                    self.visit_expression(arg, &Default::default());
+                });
+            }
+            AccessExpression::Member(member) => {
+                self.visit_expression(&member.inner, additional);
+            }
+            AccessExpression::Tuple(tuple) => {
+                self.visit_expression(&tuple.tuple, additional);
+            }
+            _ => {}
+        }
+
         Default::default()
     }
 
@@ -69,9 +84,9 @@ pub trait ExpressionVisitor<'a> {
     }
 
     fn visit_circuit_init(
-    &mut self,
-    _input: &'a CircuitExpression,
-    _additional: &Self::AdditionalInput,
+        &mut self,
+        _input: &'a CircuitExpression,
+        _additional: &Self::AdditionalInput,
     ) -> Self::Output {
         Default::default()
     }

compiler/parser/src/parser/expression.rs

@@ -384,10 +384,7 @@ impl ParserContext<'_> {
         if !trailing && tuple.len() == 1 {
             Ok(tuple.swap_remove(0))
         } else {
-            Ok(Expression::Tuple(TupleExpression {
-                elements: tuple,
-                span
-            }))
+            Ok(Expression::Tuple(TupleExpression { elements: tuple, span }))
         }
     }
 

compiler/parser/src/parser/type_.rs

@@ -84,7 +84,8 @@ impl ParserContext<'_> {
     }
 
     /// Returns a [`(Type, Span)`] where `Type` is a `Type::Tuple` AST node.
-    pub fn parse_tuple_type(&mut self) -> Result<(Type, Span)> { // todo: catch and return error for nested tuple type.
+    pub fn parse_tuple_type(&mut self) -> Result<(Type, Span)> {
+        // todo: catch and return error for nested tuple type.
         let (types, _, span) = self.parse_paren_comma_list(|p| p.parse_single_type().map(Some))?;
         let elements = types.into_iter().map(|(type_, _)| type_).collect::<Vec<_>>();
 

compiler/passes/src/type_checker/check_expressions.rs

@@ -98,7 +98,6 @@ impl<'a> ExpressionVisitor<'a> for TypeChecker<'a> {
         }
     }
 
-
     fn visit_binary(&mut self, input: &'a BinaryExpression, destination: &Self::AdditionalInput) -> Self::Output {
         match input.op {
             BinaryOperation::And | BinaryOperation::Or | BinaryOperation::Nand | BinaryOperation::Nor => {
@@ -322,7 +321,6 @@ impl<'a> ExpressionVisitor<'a> for TypeChecker<'a> {
         }
     }
 
-
     fn visit_call(&mut self, input: &'a CallExpression, expected: &Self::AdditionalInput) -> Self::Output {
         match &*input.function {
             Expression::Identifier(ident) => {
@@ -338,7 +336,7 @@ impl<'a> ExpressionVisitor<'a> for TypeChecker<'a> {
                                 input.arguments.len(),
                                 input.span(),
                             )
-                                .into(),
+                            .into(),
                         );
                     }
 
@@ -361,11 +359,7 @@ impl<'a> ExpressionVisitor<'a> for TypeChecker<'a> {
         }
     }
 
-    fn visit_circuit_init(
-        &mut self,
-        input: &'a CircuitExpression,
-        additional: &Self::AdditionalInput,
-    ) -> Self::Output {
+    fn visit_circuit_init(&mut self, input: &'a CircuitExpression, additional: &Self::AdditionalInput) -> Self::Output {
         let circ = self.symbol_table.borrow().lookup_circuit(&input.name.name).cloned();
         if let Some(circ) = circ {
             // Check circuit type name.
@@ -509,8 +503,6 @@ impl<'a> ExpressionVisitor<'a> for TypeChecker<'a> {
         })
     }
 
-
-
     fn visit_ternary(&mut self, input: &'a TernaryExpression, expected: &Self::AdditionalInput) -> Self::Output {
         self.visit_expression(&input.condition, &Some(Type::Boolean));
 
@@ -525,7 +517,11 @@ impl<'a> ExpressionVisitor<'a> for TypeChecker<'a> {
         if let Some(Type::Tuple(expected_types)) = expected {
             // Check actual length is equal to expected length.
             if expected_types.len() != input.elements.len() {
-                self.emit_err(TypeCheckerError::incorrect_tuple_length(expected_types.len(), input.elements.len(), input.span()));
+                self.emit_err(TypeCheckerError::incorrect_tuple_length(
+                    expected_types.len(),
+                    input.elements.len(),
+                    input.span(),
+                ));
             }
 
             expected_types
@@ -594,5 +590,4 @@ impl<'a> ExpressionVisitor<'a> for TypeChecker<'a> {
             }
         }
     }
-
 }

tests/compiler/tuple/function_return.leo

@@ -0,0 +1,10 @@
+/*
+namespace: Compile
+expectation: Pass
+input_file:
+ - inputs/bool_bool.in
+*/
+
+function main(a: bool, b: bool) -> (bool, bool) {
+    return (a, b);
+}

tests/compiler/tuple/function_return_single_fail.leo

@@ -0,0 +1,10 @@
+/*
+namespace: Compile
+expectation: Fail
+input_file:
+ - inputs/bool_bool.in
+*/
+
+function main(a: bool, b: bool) -> (bool) {
+    return (a);
+}

tests/compiler/tuple/function_return_zero_fail.leo

@@ -0,0 +1,10 @@
+/*
+namespace: Compile
+expectation: Fail
+input_file:
+ - inputs/bool_bool.in
+*/
+
+function main(a: bool, b: bool) -> () {
+    return ();
+}

tests/compiler/tuple/inputs/bool_bool.in

@@ -0,0 +1,3 @@
+[main]
+a: bool = true;
+b: bool = false;

tests/expectations/compiler/compiler/circuits/duplicate_name_context.out

@@ -2,4 +2,4 @@
 namespace: Compile
 expectation: Fail
 outputs:
-  - "Error [EAST0372015]: circuit `Bar` shadowed by\n    --> compiler-test:8:5\n     |\n   8 |     const Bar: u32 = 66u32;\n     |     ^^^^^^^^^^^^^^^^^^^^^^\n"
+  - "Error [EAST0372016]: circuit `Bar` shadowed by\n    --> compiler-test:8:5\n     |\n   8 |     const Bar: u32 = 66u32;\n     |     ^^^^^^^^^^^^^^^^^^^^^^\n"

tests/expectations/compiler/compiler/circuits/inline.out

@@ -4,4 +4,4 @@ expectation: Pass
 outputs:
   - output:
       - initial_input_ast: no input
-    initial_ast: 8507cd1753f4d2a835fa34d3d784487d89d595ea415d51145dd7291a839159c2
+    initial_ast: 06b7428058f95519ae12657c24f873f86f43f30f9715ee3f1c0192e632775d32

tests/expectations/compiler/compiler/circuits/inline_member_pass.out

@@ -4,4 +4,4 @@ expectation: Pass
 outputs:
   - output:
       - initial_input_ast: no input
-    initial_ast: 9489ab9b78bd31ac516e1674a83c6b35708238174df88374a7b19cef3d4a8e8a
+    initial_ast: d040a3a4f2be00b8123a1cbdbfe08a651526c76f12b24e0378f4f11fa7ded820

tests/expectations/compiler/compiler/circuits/member_variable.out

@@ -4,4 +4,4 @@ expectation: Pass
 outputs:
   - output:
       - initial_input_ast: 29f6139d908d390f890f04d8ee620757d29b7f71cd48c46ff65bc1e70aae840c
-    initial_ast: 630995cc22fb6ec613f02e3aaa18392770158b2bbaf5aa1736c0bf71dd7357ce
+    initial_ast: 9a9a861c36d5b4a6207e542505b8fa338721cd6cb57904577b425c733f0ae480

tests/expectations/compiler/compiler/function/duplicate_definition_fail.out

@@ -2,4 +2,4 @@
 namespace: Compile
 expectation: Fail
 outputs:
-  - "Error [EAST0372014]: function `main` shadowed by\n    --> compiler-test:8:1\n     |\n   8 | function main(y: bool) -> bool {\n   9 |     console.log(\"{}\", 2u8);\n  10 |     return y; \n  11 | }\n     | ^\n"
+  - "Error [EAST0372015]: function `main` shadowed by\n    --> compiler-test:8:1\n     |\n   8 | function main(y: bool) -> bool {\n   9 |     console.log(\"{}\", 2u8);\n  10 |     return y; \n  11 | }\n     | ^\n"

tests/expectations/compiler/compiler/function/duplicate_parameter_fail.out

@@ -2,4 +2,4 @@
 namespace: Compile
 expectation: Fail
 outputs:
-  - "Error [EAST0372017]: variable `a` shadowed by\n    --> compiler-test:3:23\n     |\n   3 | function main(a: u32, a: u32) -> u32 {\n     |                       ^\n"
+  - "Error [EAST0372018]: variable `a` shadowed by\n    --> compiler-test:3:23\n     |\n   3 | function main(a: u32, a: u32) -> u32 {\n     |                       ^\n"

tests/expectations/compiler/compiler/function/shadow_function_with_input_fail.out

@@ -2,4 +2,4 @@
 namespace: Compile
 expectation: Fail
 outputs:
-  - "Error [EAST0372014]: function `hi` shadowed by\n    --> compiler-test:7:17\n     |\n   7 | function tester(hi: u8) -> u8 {\n     |                 ^^\n"
+  - "Error [EAST0372015]: function `hi` shadowed by\n    --> compiler-test:7:17\n     |\n   7 | function tester(hi: u8) -> u8 {\n     |                 ^^\n"

tests/expectations/compiler/compiler/records/duplicate_circuit_name_fail.out

@@ -2,4 +2,4 @@
 namespace: Compile
 expectation: Fail
 outputs:
-  - "Error [EAST0372016]: record `Token` shadowed by\n    --> compiler-test:12:1\n     |\n  12 | circuit Token { // This circuit cannot have the same name as the record defined above it.\n  13 |     x: u32,\n  14 | }\n     | ^\n"
+  - "Error [EAST0372017]: record `Token` shadowed by\n    --> compiler-test:12:1\n     |\n  12 | circuit Token { // This circuit cannot have the same name as the record defined above it.\n  13 |     x: u32,\n  14 | }\n     | ^\n"

tests/expectations/compiler/compiler/records/init_expression.out

@@ -4,4 +4,4 @@ expectation: Pass
 outputs:
   - output:
       - initial_input_ast: no input
-    initial_ast: cc9fdc5ee476d5c8930260c5fc50c968915434892180f0084f15cd69b905dc20
+    initial_ast: 209ec3cdd48655115bca90839ebe91260044d8ee9edb4c7c4542497427cb1d76

tests/expectations/compiler/compiler/records/init_expression_shorthand.out

@@ -4,4 +4,4 @@ expectation: Pass
 outputs:
   - output:
       - initial_input_ast: no input
-    initial_ast: c765de9e29d4ca9bd9ba2f7a5ee72c2e4c8278948d32a6c9a441f5eacde564ea
+    initial_ast: 73452a5c1cd8fc44277d025eb18a42529e4cc9f97282b508e996912c6b8753d3

tests/expectations/compiler/compiler/statements/duplicate_variable.out

@@ -2,4 +2,4 @@
 namespace: Compile
 expectation: Fail
 outputs:
-  - "Error [EAST0372017]: variable `x` shadowed by\n    --> compiler-test:5:4\n     |\n   5 |   \tlet x: bool = true;\n     |    ^^^^^^^^^^^^^^^^^^\n"
+  - "Error [EAST0372018]: variable `x` shadowed by\n    --> compiler-test:5:4\n     |\n   5 |   \tlet x: bool = true;\n     |    ^^^^^^^^^^^^^^^^^^\n"

tests/expectations/compiler/compiler/tuple/function_return.out

@@ -0,0 +1,7 @@
+---
+namespace: Compile
+expectation: Pass
+outputs:
+  - output:
+      - initial_input_ast: 99be02d0d987d66d7bcac961871997df93d22a28989a08cb71ce2ea65528b6e6
+    initial_ast: 6f8a109c723a892e2b3dc61071a5330fa6827fb15bea0ed6e1f52bf40f60f8cf

tests/expectations/compiler/compiler/tuple/function_return_single_fail.out

@@ -0,0 +1,5 @@
+---
+namespace: Compile
+expectation: Fail
+outputs:
+  - "Error [EAST0372014]: Tuples of one element are not allowed.\n    --> compiler-test:3:36\n     |\n   3 | function main(a: bool, b: bool) -> (bool) {\n     |                                    ^^^^^^\n     |\n     = Try defining a single type by removing the parenthesis `( )`"

tests/expectations/compiler/compiler/tuple/function_return_zero_fail.out

@@ -0,0 +1,5 @@
+---
+namespace: Compile
+expectation: Fail
+outputs:
+  - "Error [EAST0372013]: Tuples of zero elements are not allowed.\n    --> compiler-test:3:36\n     |\n   3 | function main(a: bool, b: bool) -> () {\n     |                                    ^^"

tests/expectations/parser/parser/expression/literal/group_fail.out

@@ -2,12 +2,12 @@
 namespace: ParseExpression
 expectation: Fail
 outputs:
-  - "Error [EPAR0370005]: expected A valid expression. -- got 'A tuple expression.'\n    --> test:1:1\n     |\n   1 | ()group\n     | ^^"
+  - "did not consume all input: 'group' @ 1:3-8\n"
   - "Error [EPAR0370027]: Could not parse the implicit value: 123.\n    --> test:1:2\n     |\n   1 | (123)group\n     |  ^^^"
   - "Error [EPAR0370009]: unexpected string: expected 'expression', got ','\n    --> test:1:2\n     |\n   1 | (,)group\n     |  ^"
   - "Error [EPAR0370009]: unexpected string: expected 'expression', got '+'\n    --> test:1:2\n     |\n   1 | (+, -,)group\n     |  ^"
   - "Error [EPAR0370009]: unexpected string: expected 'expression', got ','\n    --> test:1:2\n     |\n   1 | (,+, -)group\n     |  ^"
-  - "Error [EPAR0370005]: expected A valid expression. -- got 'A tuple expression.'\n    --> test:1:1\n     |\n   1 | (x,y)group\n     | ^^^^^"
+  - "did not consume all input: 'group' @ 1:6-11\n"
   - "Error [EPAR0370027]: Could not parse the implicit value: 123.\n    --> test:1:2\n     |\n   1 | (123,456u8)group\n     |  ^^^"
   - "Error [EPAR0370027]: Could not parse the implicit value: 123.\n    --> test:1:2\n     |\n   1 | (123,456field)group\n     |  ^^^"
   - "Error [EPAR0370004]: Unexpected white space between terms (123,456) and group\n    --> test:1:11\n     |\n   1 | (123, 456) group\n     |           ^"