Class: Packr::RegexpGroup

Inherits:
Object
  • Object
show all
Defined in:
lib/packr/regexp_group.rb

Defined Under Namespace

Classes: Item

Constant Summary collapse

IGNORE = 
"\\0"
BACK_REF = 
/\\(\d+)/
ESCAPE_CHARS = 
/\\./
ESCAPE_BRACKETS = 
/\(\?[:=!]|\[[^\]]+\]/
BRACKETS = 
/\(/
KEYS = 
"~"

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(values, flags = nil) ⇒ RegexpGroup

Returns a new instance of RegexpGroup.



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# File 'lib/packr/regexp_group.rb', line 13

def initialize(values, flags = nil)
  @values = []
  values.each { |key, value| @values << Item.new(key, value) }
  if flags && flags.is_a(String)
    @ignore_case = !!(flags =~ /i/)
  end
end

Instance Attribute Details

#values ⇒ Object

Returns the value of attribute values.



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# File 'lib/packr/regexp_group.rb', line 4

def values
  @values
end

Class Method Details

.count(expression) ⇒ Object 



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# File 'lib/packr/regexp_group.rb', line 116

def self.count(expression)
  expression = expression.to_s.gsub(ESCAPE_CHARS, "").gsub(ESCAPE_BRACKETS, "")
  expression.scan(BRACKETS).length
end

Instance Method Details

#exec(string, &replacement) ⇒ Object 



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# File 'lib/packr/regexp_group.rb', line 30

def exec(string, &replacement)
  string = string.to_s
  regexp = value_of
  
  replacement ||= lambda do |match|
    return "" if match.nil?
    arguments = [match] + $~.captures + [$~.begin(0), string]
    offset, result = 1, ""
    @values.each do |item|
      nxt = offset + item.length + 1
      if arguments[offset] # do we have a result?
        rep = item.replacement
        if rep.is_a?(Proc)
          args = arguments[offset...nxt]
          index = arguments[-2]
          result = rep.call *(args + [index, string])
        else
          result = rep.is_a?(Numeric) ? arguments[offset + rep] : rep.to_s
        end
      end
      offset = nxt
    end
    result
  end
  
  replacement.is_a?(Proc) ? string.gsub(regexp, &replacement) :
      string.gsub(regexp, replacement.to_s)
end

#test(string) ⇒ Object 



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# File 'lib/packr/regexp_group.rb', line 59

def test(string)
  exec(string) != string
end

#to_s ⇒ Object 



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# File 'lib/packr/regexp_group.rb', line 63

def to_s
  length = 0
  "(" + @values.map { |item|
    # Fix back references.
    ref = item.to_s.gsub(BACK_REF) { |m| "\\" + (1 + $1.to_i + length).to_s }
    length += item.length + 1
    ref
  }.join(")|(") + ")"
end

#union(*args) ⇒ Object 



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# File 'lib/packr/regexp_group.rb', line 21

def union(*args)
  values = {}
  @values.each { |item| values[item.expression] = item.replacement }
  args.each do |arg|
    arg.values.each { |item| values[item.expression] = item.replacement }
  end
  self.class.new(values)
end

#value_of(type = nil) ⇒ Object 



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# File 'lib/packr/regexp_group.rb', line 73

def value_of(type = nil)
  return self if type == Object
  flag = @ignore_case ? Regexp::IGNORECASE : nil
  Regexp.new(self.to_s, flag)
end