Introduce TupleType type alias for representing tuples

CHANGELOG.md

@@ -7,16 +7,17 @@
  * Internal alias `IntType` and `FloatType` used by the `Value` enum are now public
  * Error types for expecting each value type
  * Shortcut functions like `eval_int` to evaluate directly into a value type
+ * Type alias `TupleType` used to represent tuples was added
 
 ### Removed
 
- * Removed integration tests from shipped crate
+ * Integration tests were removed from shipped crate
 
 ### Changed
 
 ### Fixed
 
- * Wording of some documentation items
+ * Wording of some documentation items was changed to improve readability
 
 ### Deprecated
 

src/error/mod.rs

@@ -7,6 +7,7 @@
 
 use crate::value::Value;
 use token::PartialToken;
+use value::TupleType;
 
 /// Errors used in this crate.
 #[derive(Debug, PartialEq)]
@@ -88,7 +89,7 @@ pub enum Error {
     /// Only use this if there is no other error that describes the expected and provided types in more detail.
     TypeError {
         /// The expected types.
-        expected: Vec<Value>,
+        expected: TupleType,
         /// The actual value.
         actual: Value,
     },
@@ -166,7 +167,7 @@ impl Error {
     }
 
     /// Constructs `Error::TypeError{actual, expected}`.
-    pub fn type_error(actual: Value, expected: Vec<Value>) -> Self {
+    pub fn type_error(actual: Value, expected: TupleType) -> Self {
         Error::TypeError { actual, expected }
     }
 

src/interface/mod.rs

@@ -1,5 +1,6 @@
 use token;
 use tree;
+use value::TupleType;
 use Configuration;
 use EmptyConfiguration;
 use Error;
@@ -120,7 +121,7 @@ pub fn eval_boolean(string: &str) -> Result<bool, Error> {
 /// Evaluate the given expression string into a tuple.
 ///
 /// *See the [crate doc](index.html) for more examples and explanations of the expression format.*
-pub fn eval_tuple(string: &str) -> Result<Vec<Value>, Error> {
+pub fn eval_tuple(string: &str) -> Result<TupleType, Error> {
     match eval(string) {
         Ok(Value::Tuple(tuple)) => Ok(tuple),
         Ok(value) => Err(Error::expected_tuple(value)),
@@ -190,7 +191,7 @@ pub fn eval_boolean_with_configuration(
 pub fn eval_tuple_with_configuration(
     string: &str,
     configuration: &Configuration,
-) -> Result<Vec<Value>, Error> {
+) -> Result<TupleType, Error> {
     match eval_with_configuration(string, configuration) {
         Ok(Value::Tuple(tuple)) => Ok(tuple),
         Ok(value) => Err(Error::expected_tuple(value)),

src/value/mod.rs

@@ -8,6 +8,9 @@ pub type IntType = i64;
 /// The type used to represent floats in `Value::Float`.
 pub type FloatType = f64;
 
+/// The type used to represent tuples in `Value::Tuple`.
+pub type TupleType = Vec<Value>;
+
 /// The value type used by the parser.
 /// Values can be of different subtypes that are the variants of this enum.
 #[derive(Clone, Debug, PartialEq)]
@@ -21,7 +24,7 @@ pub enum Value {
     /// A boolean value.
     Boolean(bool),
     /// A tuple value.
-    Tuple(Vec<Value>),
+    Tuple(TupleType),
 }
 
 impl Value {
@@ -89,8 +92,8 @@ impl From<bool> for Value {
     }
 }
 
-impl From<Vec<Value>> for Value {
-    fn from(tuple: Vec<Value>) -> Self {
+impl From<TupleType> for Value {
+    fn from(tuple: TupleType) -> Self {
         Value::Tuple(tuple)
     }
 }