Class: FilterTable::Table

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(resource_instance, raw_data, criteria_string) ⇒ Table

Returns a new instance of Table.



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# File 'lib/utils/filter.rb', line 87

def initialize(resource_instance, raw_data, criteria_string)
  @resource_instance = resource_instance
  @raw_data = raw_data
  @raw_data = [] if @raw_data.nil?
  @criteria_string = criteria_string
  @populated_lazy_columns = {}
end

Instance Attribute Details

#criteria_string ⇒ Object (readonly)

Returns the value of attribute criteria_string.



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# File 'lib/utils/filter.rb', line 86

def criteria_string
  @criteria_string
end

#raw_data ⇒ Object (readonly)

Returns the value of attribute raw_data.



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# File 'lib/utils/filter.rb', line 86

def raw_data
  @raw_data
end

#resource_instance ⇒ Object (readonly)

Returns the value of attribute resource_instance.



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# File 'lib/utils/filter.rb', line 86

def resource_instance
  @resource_instance
end

Instance Method Details

#callback_for_lazy_field(field_name) ⇒ Object 



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# File 'lib/utils/filter.rb', line 212

def callback_for_lazy_field(field_name)
  return unless is_field_lazy?(field_name)
  custom_properties_schema.values.find do |property_struct|
    property_struct.field_name == field_name
  end.opts[:lazy]
end

#create_eval_context_for_row(*_) ⇒ Object 



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# File 'lib/utils/filter.rb', line 140

def create_eval_context_for_row(*_)
  raise "#{self.class} must not be used on its own. It must be inherited "\
       'and the #create_eval_context_for_row method must be implemented. This is an internal '\
       'error and should not happen.'
end

#entries ⇒ Object 



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# File 'lib/utils/filter.rb', line 155

def entries
  row_criteria_string = resource.to_s + criteria_string + ' one entry'
  raw_data.map do |row|
    create_eval_context_for_row(row, row_criteria_string)
  end
end

#field?(proposed_field) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/utils/filter.rb', line 174

def field?(proposed_field)
  # Currently we only know about a field if it is present in a at least one row of the raw data.
  # If we have no rows in the raw data, assume all fields are acceptable (and rely on failing to match on value, nil)
  return true if raw_data.empty?

  # Most resources have Symbol keys in their raw data.  Some have Strings (looking at you, `shadow`).
  is_field = false
  is_field ||= list_fields.include?(proposed_field.to_s)
  is_field ||= list_fields.include?(proposed_field.to_sym)
  is_field ||= is_field_lazy?(proposed_field.to_s)
  is_field ||= is_field_lazy?(proposed_field.to_sym)

  is_field
end

#field_populated?(field_name) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/utils/filter.rb', line 219

def field_populated?(field_name)
  @populated_lazy_columns[field_name]
end

#get_column_values(field) ⇒ Object 



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# File 'lib/utils/filter.rb', line 162

def get_column_values(field)
  raw_data.map do |row|
    row[field]
  end
end

#is_field_lazy?(sought_field_name) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/utils/filter.rb', line 205

def is_field_lazy?(sought_field_name)
  custom_properties_schema.values.any? do |property_struct|
    sought_field_name == property_struct.field_name && \
      property_struct.opts[:lazy]
  end
end

#list_fields ⇒ Object 



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# File 'lib/utils/filter.rb', line 168

def list_fields
  @__fields_in_raw_data ||= raw_data.reduce([]) do |fields, row|
    fields.concat(row.keys).uniq
  end
end

#mark_lazy_field_populated(field_name) ⇒ Object 



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# File 'lib/utils/filter.rb', line 223

def mark_lazy_field_populated(field_name)
  @populated_lazy_columns[field_name] = true
end

#params ⇒ Object 



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# File 'lib/utils/filter.rb', line 150

def params
  # TODO: consider deprecating
  raw_data
end

#populate_lazy_field(field_name, criterion) ⇒ Object 



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# File 'lib/utils/filter.rb', line 195

def populate_lazy_field(field_name, criterion)
  return unless is_field_lazy?(field_name)
  return if field_populated?(field_name)
  raw_data.each do |row|
    next if row.key?(field_name) # skip row if pre-existing data is present
    callback_for_lazy_field(field_name).call(row, criterion, self)
  end
  mark_lazy_field_populated(field_name)
end

#resource ⇒ Object 



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# File 'lib/utils/filter.rb', line 146

def resource
  resource_instance
end

#to_s ⇒ Object Also known as: inspect 



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# File 'lib/utils/filter.rb', line 189

def to_s
  resource.to_s + criteria_string
end

#where(conditions = {}, &block) ⇒ Object

Filter the raw data based on criteria (as method params) or by evaling a block; then construct a new Table of the same class as ourselves, wrapping the filtered data, and return it.



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# File 'lib/utils/filter.rb', line 98

def where(conditions = {}, &block)
  return self if !conditions.is_a?(Hash)
  return self if conditions.empty? && !block_given?

  # Initialize the details of the new Table.
  new_criteria_string = criteria_string
  filtered_raw_data = raw_data

  # If we were provided params, interpret them as criteria to be evaluated
  # against the raw data. Criteria are assumed to be hash keys.
  conditions.each do |raw_field_name, desired_value|
    raise(ArgumentError, "'#{decorate_symbols(raw_field_name)}' is not a recognized criterion - expected one of #{decorate_symbols(list_fields).join(', ')}'") unless field?(raw_field_name)
    populate_lazy_field(raw_field_name, desired_value) if is_field_lazy?(raw_field_name)
    new_criteria_string += " #{raw_field_name} == #{desired_value.inspect}"
    filtered_raw_data = filter_raw_data(filtered_raw_data, raw_field_name, desired_value)
  end

  # If we were given a block, make a special Struct for each row, that has an accessor
  # for each field declared using `register_custom_property`, then instance-eval the block
  # against the struct.
  if block_given?
    # Perform the filtering.
    filtered_raw_data = filtered_raw_data.find_all { |row_as_hash| create_eval_context_for_row(row_as_hash, '').instance_eval(&block) }
    # Try to interpret the block for updating the stringification.
    src = Trace.new
    # Swallow any exceptions raised here.
    # See https://github.com/chef/inspec/issues/2929
    begin
      src.instance_eval(&block)
    rescue # rubocop: disable Lint/HandleExceptions
      # Yes, robocop, ignoring all exceptions is normally
      # a bad idea.  Here, an exception just means we don't
      # understand what was in a `where` block, so we can't
      # meaningfully sytringify it.  We still have a decent
      # default stringification.
    end
    new_criteria_string += Trace.to_ruby(src)
  end

  self.class.new(resource, filtered_raw_data, new_criteria_string)
end