Module: Migr8::Util::Expander

Defined in:

lib/migr8.rb

Defined Under Namespace

Classes: UnknownVariableError

Class Method Summary

• .expand_str(str, dict) ⇒ Object
• .expand_value(value, dict) ⇒ Object
• .expand_vars(vars) ⇒ Object

Class Method Details

.expand_str(str, dict) ⇒ Object

# File 'lib/migr8.rb', line 2197

def expand_str(str, dict)
  raise unless dict.is_a?(Hash)
  if str =~ /\A\$\{(.*?)\}\z/
    var = $1
    if var.empty?
      return ''
    elsif dict.key?(var)
      return dict[var]
    else
      raise UnknownVariableError.new("${#{var}}: no such variable.")
    end
  else
    return str.gsub(/\$\{(.*?)\}/) {
      var = $1
      if var.empty?
        ''
      elsif dict.key?(var)
        dict[var].to_s
      else
        raise UnknownVariableError.new("${#{var}}: no such variable.")
      end
    }
  end
end

.expand_value(value, dict) ⇒ Object

# File 'lib/migr8.rb', line 2174

def expand_value(value, dict)
  case value
  when String
    return expand_str(value, dict)
  when Array
    arr = value
    i = 0
    while i < arr.length
      arr[i] = expand_value(arr[i], dict)
      i += 1
    end
    return arr
  when Hash
    hash = value
    hash.keys.each do |k|
      hash[k] = expand_value(hash[k], dict)
    end
    return hash
  else
    return value
  end
end

.expand_vars(vars) ⇒ Object

# File 'lib/migr8.rb', line 2164

def expand_vars(vars)
  dict = {}
  vars.each do |d|
    d.each do |k, v|
      dict[k] = expand_value(v, dict)
    end
  end if vars
  return dict
end