Class: KDL::Types::URLTemplate::Parser

Inherits:
Object
  • Object
show all
Defined in:
lib/kdl/types/url_template.rb

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(string) ⇒ Parser

Returns a new instance of Parser.



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# File 'lib/kdl/types/url_template.rb', line 30

def initialize(string)
  @string = string
  @index = 0
end

Class Method Details

.parse(string) ⇒ Object 



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# File 'lib/kdl/types/url_template.rb', line 26

def self.parse(string)
  new(string).parse
end

Instance Method Details

#next_token ⇒ Object 



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# File 'lib/kdl/types/url_template.rb', line 43

def next_token
  buffer = +''
  context = nil
  expansion_type = nil
  loop do
    c = @string[@index]
    case context
    when nil
      case c
      when '{'
        context = :expansion
        buffer = +''
        n = @string[@index + 1]
        expansion_type = case n
                         when '+' then ReservedExpansion
                         when '#' then FragmentExpansion
                         when '.' then LabelExpansion
                         when '/' then PathExpansion
                         when ';' then ParameterExpansion
                         when '?' then QueryExpansion
                         when '&' then QueryContinuation
                         else StringExpansion
                         end
        @index += (expansion_type == StringExpansion ? 1 : 2)
      when nil then return nil
      else
        buffer = +c
        @index += 1
        context = :literal
      end
    when :literal
      case c
      when '{', nil then return StringLiteral.new(buffer)
      else
        buffer << c
        @index += 1
      end
    when :expansion
      case c
      when '}'
        @index += 1
        return parse_expansion(buffer, expansion_type)
      when nil
        raise ArgumentError, 'unterminated expansion'
      else
        buffer << c
        @index += 1
      end
    end
  end
end

#parse ⇒ Object 



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# File 'lib/kdl/types/url_template.rb', line 35

def parse
  result = []
  until (token = next_token).nil?
    result << token
  end
  result
end

#parse_expansion(string, type) ⇒ Object 



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# File 'lib/kdl/types/url_template.rb', line 95

def parse_expansion(string, type)
  variables = string.split(',').map do |str|
    case str
    when /(.*)\*$/
      Variable.new(Regexp.last_match(1),
                   explode: true,
                   allow_reserved: type.allow_reserved?,
                   with_name: type.with_name?,
                   keep_empties: type.keep_empties?)
    when /(.*):(\d+)/
      Variable.new(Regexp.last_match(1),
                   limit: Regexp.last_match(2).to_i,
                   allow_reserved: type.allow_reserved?,
                   with_name: type.with_name?,
                   keep_empties: type.keep_empties?)
    else
      Variable.new(str,
                   allow_reserved: type.allow_reserved?,
                   with_name: type.with_name?,
                   keep_empties: type.keep_empties?)
    end
  end
  type.new(variables)
end