Created
January 10, 2017 10:42
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practical test
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COMMANDS = ['DEPEND', 'INSTALL', 'REMOVE', 'LIST'] | |
@component_dependencies = Hash.new | |
@installed_components = Array.new | |
def validate_command(command) | |
command_size = command.size | |
command_name = command.split(' ').first | |
return false unless COMMANDS.include?(command_name) | |
return false if command_name != command_name.upcase | |
return false if command_size > 80 | |
return true | |
end | |
def execute_command(command) | |
command_name = command.split(' ')[0] | |
command_in_array = command.split(' ') | |
component = command_in_array[1] | |
items = command_in_array.drop(2) | |
case command_name | |
when 'DEPEND' | |
create_dependency(component, items) | |
when 'INSTALL' | |
install_component(component, items) | |
when 'REMOVE' | |
remove_component(component) | |
when 'LIST' | |
list_components | |
end | |
end | |
def create_dependency(component, items) | |
@component_dependencies.merge!(component=> items) | |
print @component_dependencies | |
print "\n" | |
end | |
def install_component(component, items) | |
if !@component_dependencies.key?(component) | |
print "Installing #{component}\n" | |
@installed_components.push component | |
print @installed_components | |
print "\n" | |
else | |
@component_dependencies[component].each do |c| | |
if !@installed_components.include?(c) | |
print " Installing #{c} \n" | |
@installed_components.push c | |
else | |
next | |
end | |
#@installed_components.push | |
end | |
@installed_components.push component | |
print " Installing #{component}\n" | |
end | |
end | |
def remove_component(component) | |
if @installed_components.include?(component) | |
if @component_dependencies.key?(component) | |
print " Removing #{component}\n" | |
@installed_components.delete_if{|i|i== component} | |
else | |
component_usage = 0 | |
@component_dependencies.keys.each do |c| | |
next unless @installed_components.include?(c) | |
if @component_dependencies[c].include?(component) | |
component_usage = component_usage + 1 | |
end | |
end | |
if component_usage > 1 | |
print " #{component} is still needed\n" | |
elsif component_usage == 1 | |
@installed_components.delete_if{|i|i== component} | |
elsif component_usage == 0 | |
print " #{component} is not installed\n" | |
end | |
end | |
else | |
print " #{component} is not installed. \n" | |
end | |
end | |
def list_components | |
@installed_components.each do |c| | |
print " #{c}" | |
print "\n" | |
end | |
end | |
print 'Enter command: ' | |
print "\n" | |
while command = gets.chomp | |
command_name = command.split(' ')[0] | |
case command_name | |
when 'END' | |
break | |
when *COMMANDS | |
is_valid_command = validate_command(command) | |
print "Invalid Command!\n" unless is_valid_command | |
if is_valid_command | |
print command+"\n" unless command_name.eql?('LIST') | |
execute_command(command) | |
end | |
else | |
print "Invalid Command!\n" | |
break | |
end | |
end |
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