Class: Delphin::RelationsFile

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

Overview

A file that contains a set of database schema tables.

This object is a hash of ProfileTableSchema objects indexed by table name.

Instance Method Summary collapse

Constructor Details

#initialize(file) ⇒ RelationsFile

Returns a new instance of RelationsFile.



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# File 'lib/delphin.rb', line 337

def initialize(file)
  super()
  state = :outside_table
  table_name = nil
  file.each_with_index do |line,i|
    # Remove comments and surrounding whitespace.
    line.sub!(/#.*/, "")
    line.strip!
    case state
    when :inside_table
      if line.empty?
        state = :outside_table
      elsif line =~ /^(\S+)\s+:(\w+)(\s+:key)?(\s+:partial)?$/
        # E.g. parse-id :integer :key
        field, type = line.split
        self[table_name].add_field($1, $2, !$3.nil?, !$4.nil?)
      else
        raise InvalidRelationsFile.new(filename, i+1, line)
      end
    when :outside_table
      next if line.empty?
      if line =~ /(\S+):/
        # E.g. item:
        table_name = $1
        self[table_name] = ProfileTableSchema.new(table_name)
        state = :inside_table
      else
        raise InvalidRelationsFile.new(filename, i+1, line)
      end
    end
  end # each_with_index
end

Instance Method Details

#to_s ⇒ Object

Print out a relations file



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# File 'lib/delphin.rb', line 371

def to_s
  values.map {|t| t.to_s}.join("\n\n")
end