Class: URITemplate::RFC6570::Expression

Inherits:
Token
  • Object
show all
Extended by:
ClassMethods
Includes:
Expression
Defined in:
lib/uri_template/rfc6570/expression.rb

Direct Known Subclasses

Named, Unnamed

Defined Under Namespace

Modules: ClassMethods Classes: Basic, FormQuery, FormQueryContinuation, Fragment, Label, Named, Path, PathParameters, Reserved, Unnamed

Constant Summary collapse

PREFIX = 
''.freeze
SEPARATOR = 
','.freeze
PAIR_CONNECTOR = 
'='.freeze
PAIR_IF_EMPTY = 
true
LIST_CONNECTOR = 
','.freeze
BASE_LEVEL = 
1
CHARACTER_CLASS = 
CHARACTER_CLASSES[:unreserved]
OPERATOR = 
''

Constants included from Token

Token::EMPTY_ARRAY

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from ClassMethods

generate_hash_extractor, hash_extractor, hash_extractors

Methods included from Expression

#expression?, #literal?

Methods included from Token

#ends_with_slash?, #host?, #scheme?, #size, #starts_with_slash?

Constructor Details

#initialize(vars) ⇒ Expression

Returns a new instance of Expression.



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# File 'lib/uri_template/rfc6570/expression.rb', line 34

def initialize(vars)
  @variable_specs = vars
  @variables = vars.map(&:first)
  @variables.uniq!
end

Instance Attribute Details

#variables ⇒ Object (readonly)

Returns the value of attribute variables.



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# File 'lib/uri_template/rfc6570/expression.rb', line 32

def variables
  @variables
end

Instance Method Details

#arity ⇒ Object 



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# File 'lib/uri_template/rfc6570/expression.rb', line 63

def arity
  @variable_specs.size
end

#expand(vars) ⇒ Object 



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# File 'lib/uri_template/rfc6570/expression.rb', line 67

def expand( vars )
  result = []
  @variable_specs.each do | var, expand , max_length |
    if Utils.def? vars[var]
      result.push(*expand_one(var, vars[var], expand, max_length))
    end
  end
  if result.any?
    return (self.class::PREFIX + result.join(self.class::SEPARATOR))
  else
    return ''
  end
end

#expand_partial(vars) ⇒ Object 



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# File 'lib/uri_template/rfc6570/expression.rb', line 81

def expand_partial( vars )
  result = []
  follow_up = self.class::FOLLOW_UP
  var_specs = []
  @variable_specs.each do | var, expand , max_length |
    if vars.key? var
      unless var_specs.none?
        result.push( follow_up.new( var_specs ) )
        var_specs = []
      end
      unless result.none?
        result.push( Literal.new(self.class::SEPARATOR) )
      end
      one = Array(expand_one(var, vars[var], expand, max_length))
      result.push( Literal.new(one.join(self.class::SEPARATOR)))
    end
    var_specs << [var,expand,max_length]
  end
  if result.none?
    # no literal was emitted so far
    return [ self ]
  end
  unless self.class::PREFIX.empty? || empty_literals?( result )
    result.unshift( Literal.new(self.class::PREFIX) )
  end
  if var_specs.size != 0
    result.push( follow_up.new( var_specs ) )
  end
  return result
end

#extract(position, matched) ⇒ Object 



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# File 'lib/uri_template/rfc6570/expression.rb', line 112

def extract(position,matched)
  name, expand, max_length = @variable_specs[position]
  if matched.nil?
    return [[ name , extracted_nil ]]
  end
  if expand
    it = URITemplate::RegexpEnumerator.new(self.class.hash_extractor(max_length), :rest => :raise)
    if position == 0
      matched = "#{self.class::SEPARATOR}#{matched}"
    end
    splitted = it.each(matched)\
      .map do |match|
        raise match.inspect if match.kind_of? String
        [ decode(match[1]), decode(match[2], false) ]
      end
    return after_expand(name, splitted)
  end

  return [ [ name, decode( matched ) ] ]
end

#level ⇒ Object 



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# File 'lib/uri_template/rfc6570/expression.rb', line 51

def level
  if @variable_specs.none?{|_,expand,ml| expand || (ml > 0) }
    if @variable_specs.size == 1
      return self.class::BASE_LEVEL
    else
      return 3
    end
  else
    return 4
  end
end

#to_s ⇒ Object 



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# File 'lib/uri_template/rfc6570/expression.rb', line 133

def to_s
  return '{' + self.class::OPERATOR + @variable_specs.map{|name,expand,max_length| name + (expand ? '*': '') + (max_length > 0 ? (':' + max_length.to_s) : '') }.join(',') + '}'
end