Class: TwitterCldr::Transforms::Rule

Inherits:
Object
  • Object
show all
Defined in:
lib/twitter_cldr/transforms/rule.rb

Overview

Base class for all transform rules

Constant Summary collapse

STRING_TYPES = 
[
  :escaped_char, :unicode_char, :escaped_backslash,
  :quoted_string, :doubled_quote
]

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.regexp_token_string(tokens) ⇒ Object 



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# File 'lib/twitter_cldr/transforms/rule.rb', line 53

def regexp_token_string(tokens)
  tokens.inject('') do |ret, token|
    val = token_value(token)

    ret + case token.type
      when *STRING_TYPES
        Regexp.escape(val)
      else
        val
    end
  end
end

.remove_comment(rule_text) ⇒ Object 



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# File 'lib/twitter_cldr/transforms/rule.rb', line 66

def remove_comment(rule_text)
  # comment must come after semicolon
  if rule_idx = rule_text.index(/;[\s]*#/)
    rule_text[0..rule_idx]
  else
    rule_text
  end
end

.replace_symbols(tokens, symbol_table) ⇒ Object 



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# File 'lib/twitter_cldr/transforms/rule.rb', line 19

def replace_symbols(tokens, symbol_table)
  tokens.inject([]) do |ret, token|
    ret + if token.type == :variable
      symbol_table[token.value].value_tokens
    else
      Array(token)
    end
  end
end

.token_string(tokens) ⇒ Object 



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# File 'lib/twitter_cldr/transforms/rule.rb', line 47

def token_string(tokens)
  tokens.inject('') do |ret, token|
    ret + token_value(token)
  end
end

.token_value(token) ⇒ Object 



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# File 'lib/twitter_cldr/transforms/rule.rb', line 29

def token_value(token)
  case token.type
    when :escaped_char
      token.value.sub(/\A\\/, '')
    when :unicode_char
      hex = token.value.sub(/\A\\u/, '')
      [hex.to_i(16)].pack('U*')
    when :escaped_backslash
      '\\'
    when :quoted_string
      token.value[1..-2]
    when :doubled_quote
      "'"
    else
      token.value
  end
end

Instance Method Details

#backward? ⇒ Boolean

Returns:

  • (Boolean)

Raises:

  • (NotImplementedError) 


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# File 'lib/twitter_cldr/transforms/rule.rb', line 109

def backward?
  raise NotImplementedError,
    "#{__method__} must be defined in derived classes"
end

#forward? ⇒ Boolean

Returns:

  • (Boolean)

Raises:

  • (NotImplementedError) 


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# File 'lib/twitter_cldr/transforms/rule.rb', line 104

def forward?
  raise NotImplementedError,
    "#{__method__} must be defined in derived classes"
end

#invert ⇒ Object

Raises:

  • (NotImplementedError) 


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# File 'lib/twitter_cldr/transforms/rule.rb', line 114

def invert
  raise NotImplementedError,
    "#{__method__} must be defined in derived classes"
end

#is_comment? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/twitter_cldr/transforms/rule.rb', line 100

def is_comment?
  false
end

#is_conversion_rule? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/twitter_cldr/transforms/rule.rb', line 92

def is_conversion_rule?
  false
end

#is_filter_rule? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/twitter_cldr/transforms/rule.rb', line 84

def is_filter_rule?
  false
end

#is_transform_rule? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/twitter_cldr/transforms/rule.rb', line 88

def is_transform_rule?
  false
end

#is_variable? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/twitter_cldr/transforms/rule.rb', line 96

def is_variable?
  false
end

#token_string(tokens) ⇒ Object 



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# File 'lib/twitter_cldr/transforms/rule.rb', line 80

def token_string(tokens)
  self.class.token_string(tokens)
end

#token_value(token) ⇒ Object 



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# File 'lib/twitter_cldr/transforms/rule.rb', line 76

def token_value(token)
  self.class.token_value(token)
end