Class: Simulator::VariableContext

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

Instance Method Summary collapse

Constructor Details

#initialize ⇒ VariableContext

Returns a new instance of VariableContext.



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# File 'lib/simulator/variable_context.rb', line 3

def initialize
  @variables_hash = {}
end

Instance Method Details

#add(var_hash) ⇒ Object 



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# File 'lib/simulator/variable_context.rb', line 7

def add(var_hash)
  vars = var_hash.collect do |k, v|
    Variable.new k
  end
  add_variables *vars
  set var_hash
end

#add_variables(*vars) ⇒ Object

add variables. doesn’t check for uniqueness, does not overwrite existing



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# File 'lib/simulator/variable_context.rb', line 16

def add_variables(*vars)
  # create bound variables for each variable
  bound_vars = vars.collect do |v|
    BoundVariable.new v, self
  end

  # add all the bound variables to the variables hash
  keys = vars.collect(&:name)
  append_hash = Hash[ keys.zip(bound_vars) ]
  @variables_hash.merge!(append_hash) do |key, oldval, newval|
    oldval # the first bound variable
  end
end

#clone ⇒ Object 



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# File 'lib/simulator/variable_context.rb', line 52

def clone
  copy = VariableContext.new
  copy.add_variables *unbound_variables

  # create a value hash of variable names and values
  value_hash = variables.inject({}) do |memo, v|
    memo[v.name] = v.value
    memo
  end
  copy.set value_hash
  copy
end

#get(var_name) ⇒ Object 



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# File 'lib/simulator/variable_context.rb', line 40

def get(var_name)
  @variables_hash[var_name]
end

#set(var_hash) ⇒ Object

Use to set the value for a variety of variables



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# File 'lib/simulator/variable_context.rb', line 31

def set(var_hash)
  var_hash.each do |variable_name, value|
    throw :MissingVariable unless @variables_hash.has_key? variable_name

    bv = @variables_hash[variable_name]
    bv.value = value
  end
end

#unbound_variables ⇒ Object 



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# File 'lib/simulator/variable_context.rb', line 48

def unbound_variables
  variables.collect(&:variable)
end

#variables ⇒ Object 



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# File 'lib/simulator/variable_context.rb', line 44

def variables
  @variables_hash.values
end