Remove CalculationInterpolation (#161)

lib/sass/calculation_value.rb

@@ -13,5 +13,4 @@ def assert_calculation_value(_name = nil)
   end
 end
 
-require_relative 'calculation_value/calculation_interpolation'
 require_relative 'calculation_value/calculation_operation'

lib/sass/value/calculation.rb

@@ -37,7 +37,7 @@ def max(arguments)
         def clamp(min, value = nil, max = nil)
           if (value.nil? && !valid_clamp_arg?(min)) ||
              (max.nil? && [min, value].none? { |x| x && valid_clamp_arg?(x) })
-            raise Sass::ScriptError, 'Argument must be an unquoted SassString or CalculationInterpolation.'
+            raise Sass::ScriptError, 'Argument must be an unquoted SassString.'
           end
 
           new('clamp', [min, value, max].compact)
@@ -46,8 +46,7 @@ def clamp(min, value = nil, max = nil)
         private
 
         def valid_clamp_arg?(value)
-          value.is_a?(Sass::CalculationValue::CalculationInterpolation) ||
-            (value.is_a?(Sass::Value::String) && !value.quoted?)
+          value.is_a?(Sass::Value::String) && !value.quoted?
         end
       end
 

spec/sass/value/calculation_spec.rb

@@ -7,8 +7,7 @@
     Sass::Value::Number.new(1),
     Sass::Value::String.new('1', quoted: false),
     described_class.calc(Sass::Value::Number.new(1)),
-    Sass::CalculationValue::CalculationOperation.new('+', Sass::Value::Number.new(1), Sass::Value::Number.new(1)),
-    Sass::CalculationValue::CalculationInterpolation.new('')
+    Sass::CalculationValue::CalculationOperation.new('+', Sass::Value::Number.new(1), Sass::Value::Number.new(1))
   ]
   invalid_calculation_values = [Sass::Value::String.new('1', quoted: true)]
 
@@ -164,8 +163,7 @@
     # When `clamp()` is called with less than three arguments, the list of
     # accepted values is much narrower
     valid_clamp_values = [
-      Sass::Value::String.new('1', quoted: false),
-      Sass::CalculationValue::CalculationInterpolation.new('1')
+      Sass::Value::String.new('1', quoted: false)
     ]
     invalid_clamp_values = [
       Sass::Value::Number.new(1),
@@ -298,7 +296,7 @@
       expect do
         Sass.compile_string('a {b: foo()}',
                             functions: { 'foo()': fn }).css
-      end.to raise_sass_compile_error.with_message('SassString or CalculationInterpolation')
+      end.to raise_sass_compile_error.with_message('SassString')
     end
 
     it 'an unknown calculation function' do

spec/sass_proto_spec.rb

@@ -63,7 +63,6 @@ def remote_eq(lhs, rhs)
                                                                             ])
                                              ]),
     __LINE__ => Sass::Value::Calculation.clamp(Sass::Value::String.new('var(--clamp)', quoted: false)),
-    __LINE__ => Sass::Value::Calculation.clamp(Sass::CalculationValue::CalculationInterpolation.new('var(--clamp)')),
     __LINE__ => Sass::Value::Color.new(red: 0, green: 0, blue: 0, alpha: 1),
     __LINE__ => Sass::Value::Color.new(hue: 0, saturation: 0, lightness: 0, alpha: 1),
     __LINE__ => Sass::Value::Color.new(hue: 0, whiteness: 0, blackness: 0, alpha: 1),