Class: Coppertone::MacroString::MacroParser

Inherits:
Object
  • Object
show all
Defined in:
lib/coppertone/macro_string/macro_parser.rb

Overview

A internal class that parses the macro string template into an object that can later be evaluated (or ‘expanded’) in the context of a particular SPF check.

Constant Summary collapse

SIMPLE_MACRO_LETTERS = 
%w[% _ -].freeze

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(s) ⇒ MacroParser

Returns a new instance of MacroParser.



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# File 'lib/coppertone/macro_string/macro_parser.rb', line 13

def initialize(s)
  @s = s.dup
  @macros = []
  parse_macro_array
end

Instance Attribute Details

#macros ⇒ Object (readonly)

Returns the value of attribute macros.



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# File 'lib/coppertone/macro_string/macro_parser.rb', line 11

def macros
  @macros
end

Instance Method Details

#parse_contextual_interpolated_macro ⇒ Object

Raises:



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# File 'lib/coppertone/macro_string/macro_parser.rb', line 33

def parse_contextual_interpolated_macro
  raise MacroStringParsingError unless @s[1] == '{'

  closing_index = @s.index('}')
  raise MacroStringParsingError unless closing_index

  interpolated_body = @s[2, closing_index - 2]
  @macros << MacroExpand.new(interpolated_body)
  @s = @s[(closing_index + 1)..]
end

#parse_interpolated_macro ⇒ Object

Raises:



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# File 'lib/coppertone/macro_string/macro_parser.rb', line 45

def parse_interpolated_macro
  raise MacroStringParsingError if @s.length == 1

  macro_code = @s[0, 2]
  if MacroStaticExpand.exists_for?(macro_code)
    @macros << MacroStaticExpand.macro_for(macro_code)
    @s = @s[2..]
  else
    parse_contextual_interpolated_macro
  end
end

#parse_macro_array ⇒ Object 



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# File 'lib/coppertone/macro_string/macro_parser.rb', line 19

def parse_macro_array
  while @s && !@s.empty?
    if starting_macro?
      parse_interpolated_macro
    else
      parse_macro_literal
    end
  end
end

#parse_macro_literal ⇒ Object 



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# File 'lib/coppertone/macro_string/macro_parser.rb', line 57

def parse_macro_literal
  new_idx = @s.index('%')
  new_idx ||= @s.length
  @macros << MacroLiteral.new(@s[0, new_idx])
  @s = @s[new_idx..]
  new_idx
end

#starting_macro? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/coppertone/macro_string/macro_parser.rb', line 29

def starting_macro?
  @s && @s.length >= 1 && (@s[0] == '%')
end