Class: MathEngine::Context

Inherits:
Object
  • Object
show all
Defined in:
lib/context.rb

Constant Summary collapse

DEFAULT_OPTIONS = 
{case_sensitive: true}

Instance Method Summary collapse

Constructor Details

#initialize(opts = {}) ⇒ Context

Returns a new instance of Context.



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# File 'lib/context.rb', line 5

def initialize(opts = {})
  @opts = DEFAULT_OPTIONS.merge(opts)
  @variables = {}
  @dynamic_library = Class.new.new
  @libraries = [@dynamic_library, Math]
end

Instance Method Details

#call(function_name, *args) ⇒ Object

Raises:



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# File 'lib/context.rb', line 29

def call(function_name, *args)
  library = library_for_function(function_name)
  raise UnknownFunctionError.new(function_name) unless library
  library.send(function_name.to_sym, *args)
end

#constants ⇒ Object 



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# File 'lib/context.rb', line 39

def constants
  @variables.keys.select { |variable_name| constant?(variable_name) }
end

#define(function_name, func = nil, &block) ⇒ Object 



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# File 'lib/context.rb', line 23

def define(function_name, func = nil, &block)
  @dynamic_library.class.send :define_method, function_name.to_sym do |*args|
    func ? func.call(*args) : block.call(*args)
  end
end

#get(variable_name) ⇒ Object 



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# File 'lib/context.rb', line 12

def get(variable_name)
  @variables[key variable_name]
end

#include_library(library) ⇒ Object 



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# File 'lib/context.rb', line 35

def include_library(library)
  @libraries << library
end

#set(variable_name, value) ⇒ Object

Raises:



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# File 'lib/context.rb', line 16

def set(variable_name, value)
  raise MathEngine::UnableToModifyConstantError.new(key variable_name) if constant?(key variable_name) && 
                                                                          get(variable_name)
                                                                          
  @variables[key variable_name] = value
end

#variables ⇒ Object 



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# File 'lib/context.rb', line 43

def variables
  @variables.keys - constants
end