Remove activesupport dependency

keisan.gemspec

@@ -21,8 +21,6 @@ Gem::Specification.new do |spec|
 
   spec.required_ruby_version = ">= 2.0.0"
 
-  spec.add_dependency "activesupport", ">= 4.2.2"
-
   spec.add_development_dependency "coveralls"
   spec.add_development_dependency "bundler", "~> 1.14"
   spec.add_development_dependency "rake", "~> 10.0"

lib/keisan.rb

@@ -1,8 +1,6 @@
-require "active_support"
-require "active_support/core_ext"
-
 require "keisan/version"
 require "keisan/exceptions"
+require "keisan/util"
 
 require "keisan/ast/node"
 require "keisan/ast/cell"

lib/keisan/ast/builder.rb

@@ -12,10 +12,10 @@ def initialize(string: nil, parser: nil, components: nil)
         elsif !parser.nil?
           @components = parser.components
         else
-          @components = Array.wrap(components)
+          @components = Array(components)
         end
 
-        @lines = @components.split {|component|
+        @lines = Util.array_split(@components) {|component|
           component.is_a?(Parsing::LineSeparator)
         }.reject(&:empty?)
 

lib/keisan/ast/operator.rb

@@ -41,7 +41,7 @@ def initialize(children = [], parsing_operators = [])
           raise Exceptions::ASTError.new("Mismatch of children and operators")
         end
 
-        children = Array.wrap(children)
+        children = Array(children)
         super(children)
 
         @parsing_operators = parsing_operators

lib/keisan/ast/parent.rb

@@ -4,7 +4,7 @@ class Parent < Node
       attr_reader :children
 
       def initialize(children = [])
-        children = Array.wrap(children).map do |child|
+        children = Array(children).map do |child|
           child.is_a?(Cell) ? child : child.to_node
         end
         raise Exceptions::InternalError.new unless children.is_a?(Array)

lib/keisan/ast/unary_operator.rb

@@ -2,7 +2,7 @@ module Keisan
   module AST
     class UnaryOperator < Operator
       def initialize(children = [])
-        children = Array.wrap(children)
+        children = Array(children)
         super(children)
         if children.count != 1
           raise Exceptions::ASTError.new("Unary operator takes has a single child")

lib/keisan/context.rb

@@ -4,8 +4,8 @@ class Context
 
     def initialize(parent: nil, random: nil, allow_recursive: false, shadowed: [])
       @parent = parent
-      @function_registry = Functions::Registry.new(parent: @parent.try(:function_registry))
-      @variable_registry = Variables::Registry.new(parent: @parent.try(:variable_registry), shadowed: shadowed)
+      @function_registry = Functions::Registry.new(parent: @parent&.function_registry)
+      @variable_registry = Variables::Registry.new(parent: @parent&.variable_registry, shadowed: shadowed)
       @random            = random
       @allow_recursive   = allow_recursive
     end
@@ -47,7 +47,7 @@ def spawn_child(definitions: {}, shadowed: [], transient: nil)
 
     def transient_definitions
       return {} unless @transient
-      parent_definitions = @parent.present? ? @parent.transient_definitions : {}
+      parent_definitions = @parent.nil? ? {} : @parent.transient_definitions
       parent_definitions.merge(
         @variable_registry.locals
       ).merge(
@@ -100,7 +100,7 @@ def register_function!(name, function, local: false)
     end
 
     def random
-      @random || @parent.try(:random) || Random.new
+      @random || @parent&.random || Random.new
     end
 
     protected

lib/keisan/parser.rb

@@ -39,7 +39,7 @@ def multi_line?
     end
 
     def parse_multi_line!
-      line_parsers = @tokens.split {|token| token.is_a?(Tokens::LineSeparator)}.map {|tokens| self.class.new(tokens: tokens)}
+      line_parsers = Util.array_split(@tokens) {|token| token.is_a?(Tokens::LineSeparator)}.map {|tokens| self.class.new(tokens: tokens)}
       @components = []
       line_parsers.each.with_index do |line_parser, i|
         @components += line_parser.components
@@ -52,7 +52,7 @@ def parse_multi_line!
     def parse_keyword!
       keyword = tokens.first.string
       arguments = if tokens[1].is_a?(Tokens::Group)
-                    tokens[1].sub_tokens.split {|token| token.is_a?(Tokens::Comma)}.map {|argument_tokens|
+                    Util.array_split(tokens[1].sub_tokens) {|token| token.is_a?(Tokens::Comma)}.map {|argument_tokens|
                       Parsing::Argument.new(argument_tokens)
                     }
                   else
@@ -212,7 +212,7 @@ def add_group_element_components!(token)
         @components << Parsing::List.new(arguments_from_group(token))
       when :curly
         if token.sub_tokens.any? {|token| token.is_a?(Tokens::Colon)}
-          @components << Parsing::Hash.new(token.sub_tokens.split {|token| token.is_a?(Tokens::Comma)})
+          @components << Parsing::Hash.new(Util.array_split(token.sub_tokens) {|token| token.is_a?(Tokens::Comma)})
         else
           @components << Parsing::CurlyGroup.new(token.sub_tokens)
         end
@@ -280,7 +280,7 @@ def arguments_from_group(token)
       if token.sub_tokens.empty?
         []
       else
-        token.sub_tokens.split {|sub_token| sub_token.is_a?(Tokens::Comma)}.map do |sub_tokens|
+        Util.array_split(token.sub_tokens) {|sub_token| sub_token.is_a?(Tokens::Comma)}.map do |sub_tokens|
           Parsing::Argument.new(sub_tokens)
         end
       end

lib/keisan/parsing/function.rb

@@ -5,7 +5,7 @@ class Function < Element
 
       def initialize(name, arguments)
         @name = name
-        @arguments = Array.wrap(arguments)
+        @arguments = Array(arguments)
       end
     end
   end

lib/keisan/parsing/hash.rb

@@ -4,15 +4,15 @@ class Hash < Element
       attr_reader :key_value_pairs
 
       def initialize(key_value_pairs)
-        @key_value_pairs = Array.wrap(key_value_pairs).map {|key_value_pair|
+        @key_value_pairs = Array(key_value_pairs).map {|key_value_pair|
           validate_and_extract_key_value_pair(key_value_pair)
         }
       end
 
       private
 
       def validate_and_extract_key_value_pair(key_value_pair)
-        key, value = key_value_pair.split {|token| token.is_a?(Tokens::Colon)}
+        key, value = Util.array_split(key_value_pair) {|token| token.is_a?(Tokens::Colon)}
         raise Exceptions::ParseError.new("Invalid hash") unless key.size == 1 && value.size >= 1
 
         key = key.first

lib/keisan/token.rb

@@ -12,7 +12,7 @@ def type
     end
 
     def self.type
-      @type ||= self.to_s.split("::").last.underscore.to_sym
+      @type ||= Util.underscore(self.to_s.split("::").last).to_sym
     end
 
     def regex

lib/keisan/util.rb

@@ -0,0 +1,19 @@
+module Keisan
+  class Util
+    def self.underscore(str)
+      str.to_s.gsub(/([A-Z]+)([A-Z][a-z])/,'\1_\2').downcase
+    end
+
+    def self.array_split(array, &block)
+      array.inject([[]]) do |results, element|
+        if yield(element)
+          results << []
+        else
+          results.last << element
+        end
+
+        results
+      end
+    end
+  end
+end