Class: Regexp::Syntax::Base

Inherits:
Object
  • Object
show all
Defined in:
lib/regexp_parser/syntax.rb

Overview

A lookup map of supported types and tokens in a given syntax

Direct Known Subclasses

Any, Ruby::V186

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Base

Returns a new instance of Base.



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# File 'lib/regexp_parser/syntax.rb', line 77

def initialize
  @implements = {}

  implements :literal, [:literal]
end

Instance Method Details

#excludes(type, tokens) ⇒ Object

removes



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# File 'lib/regexp_parser/syntax.rb', line 96

def excludes(type, tokens)
  if tokens
    tokens = [tokens] unless tokens.is_a?(Array)
  end

  if @implements[type]
    if tokens
      @implements[type] = @implements[type] - tokens
      @implements[type] = nil if @implements[type].empty?
    else
      @implements[type] = nil
    end
  end
end

#implementation ⇒ Object 



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# File 'lib/regexp_parser/syntax.rb', line 83

def implementation
  @implements
end

#implements(type, tokens) ⇒ Object 



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# File 'lib/regexp_parser/syntax.rb', line 87

def implements(type, tokens)
  if @implements[type]
    @implements[type] = (@implements[type] + tokens).uniq
  else
    @implements[type] = tokens
  end
end

#implements!(type, token) ⇒ Object Also known as: check!

Raises:



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# File 'lib/regexp_parser/syntax.rb', line 117

def implements!(type, token)
  raise NotImplementedError.new(self, type, token) unless
    implements?(type, token)
end

#implements?(type, token) ⇒ Boolean Also known as: check?

Returns:

  • (Boolean) 


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# File 'lib/regexp_parser/syntax.rb', line 111

def implements?(type, token)
  return true if @implements[type] and @implements[type].include?(token)
  false
end

#normalize(type, token) ⇒ Object 



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# File 'lib/regexp_parser/syntax.rb', line 123

def normalize(type, token)
  case type
  when :group
    normalize_group(type, token)
  when :backref
    normalize_backref(type, token)
  else
    [type, token]
  end
end

#normalize_backref(type, token) ⇒ Object 



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# File 'lib/regexp_parser/syntax.rb', line 143

def normalize_backref(type, token)
  case token
  when :name_ref_ab, :name_ref_sq
    [:backref, :name_ref]
  when :name_call_ab, :name_call_sq
    [:backref, :name_call]
  when :name_nest_ref_ab, :name_nest_ref_sq
    [:backref, :name_nest_ref]
  when :number_ref_ab, :number_ref_sq
    [:backref, :number_ref]
  when :number_call_ab, :number_call_sq
    [:backref, :number_call]
  when :number_rel_ref_ab, :number_rel_ref_sq
    [:backref, :number_rel_ref]
  when :number_rel_call_ab, :number_rel_call_sq
    [:backref, :number_rel_call]
  when :number_nest_ref_ab, :number_nest_ref_sq
    [:backref, :number_nest_ref]
  else
    [type, token]
  end
end

#normalize_group(type, token) ⇒ Object 



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# File 'lib/regexp_parser/syntax.rb', line 134

def normalize_group(type, token)
  case token
  when :named_ab, :named_sq
    [:group, :named]
  else
    [type, token]
  end
end