Class: Korekto::Symbols

Inherits:
Object
  • Object
show all
Defined in:
lib/korekto/symbols.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Symbols

Returns a new instance of Symbols.



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# File 'lib/korekto/symbols.rb', line 4

def initialize
  @h   = {}
  @t2p = {}
  @v2t = {}
  @scanner = /:\w+|./
end

Instance Attribute Details

#t2p ⇒ Object (readonly)

Returns the value of attribute t2p.



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# File 'lib/korekto/symbols.rb', line 3

def t2p
  @t2p
end

#v2t ⇒ Object (readonly)

Returns the value of attribute v2t.



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# File 'lib/korekto/symbols.rb', line 3

def v2t
  @v2t
end

Instance Method Details

#define!(statement) ⇒ Object 



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# File 'lib/korekto/symbols.rb', line 25

def define!(statement)
  if statement.pattern?
    unless statement.literal_regexp?
      statement.scan(@scanner){|w| @h[w]=nil unless @v2t.include?(w) or @h.include?(w)}
    end
  else
    statement.scan(@scanner){|w| @h[w]=nil unless @h.include?(w)}
  end
end

#s2r(statement) ⇒ Object 



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# File 'lib/korekto/symbols.rb', line 35

def s2r(statement)
  if statement[0]=='/' and statement[-1]=='/'
    Regexp.new(statement[1..-2])
  else
    pattern,count,seen = '\A',0,{}
    statement.scan(@scanner) do |v|
      if n=seen[v]
        pattern << '\\'+n
      elsif type = @v2t[v]
        regex = @t2p[type]
        if type[0]=='.'
          pattern << regex
        else
          count += 1
          seen[v]=count.to_s
          pattern << '('+regex+')'
        end
      else
        # Escape Regexp specials
        v = Regexp.quote v
        # To avoid collisions with back-references, isolate digit in square brackets:
        '0123456789'.include?(_=v[0]) and v[0]='['+_+']'
        pattern << v
      end
    end
    raise Error, 'pattern with no captures' if count < 1
    pattern << '\Z'
    Regexp.new(pattern)
  end
end

#set_scanner(value) ⇒ Object 



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# File 'lib/korekto/symbols.rb', line 11

def set_scanner(value) = @scanner=Regexp.new(value)

#undefined(statement) ⇒ Object 



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# File 'lib/korekto/symbols.rb', line 13

def undefined(statement)
  undefined = []
  if statement.pattern?
    unless statement.literal_regexp?
      statement.scan(@scanner){|w| undefined.push(w) unless @v2t.include?(w) or @h.include?(w)}
    end
  else
    statement.scan(@scanner){|w| undefined.push(w) unless @h.include?(w)}
  end
  return undefined.uniq
end