Class: Usher::Util::Parser

Inherits:
Object
  • Object
show all
Defined in:
lib/usher/util/parser.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(router, split_regex) ⇒ Parser

Returns a new instance of Parser.



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# File 'lib/usher/util/parser.rb', line 16

def initialize(router, split_regex)
  @router = router
  @split_regex = split_regex
  @delimiters_regex = Regexp.new(router.delimiters_regex)
end

Instance Attribute Details

#router ⇒ Object (readonly)

Returns the value of attribute router.



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# File 'lib/usher/util/parser.rb', line 7

def router
  @router
end

Class Method Details

.for_delimiters(router, valid_regex) ⇒ Object 



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# File 'lib/usher/util/parser.rb', line 9

def self.for_delimiters(router, valid_regex)
  new(
    router,
    Regexp.new('((:|\*)?' + valid_regex + '|' + router.delimiters_regex + '|\(|\)|\||\{)')
  )
end

Instance Method Details

#generate_route(unprocessed_path, conditions, requirements, default_values, generate_with, priority) ⇒ Object 



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# File 'lib/usher/util/parser.rb', line 22

def generate_route(unprocessed_path, conditions, requirements, default_values, generate_with, priority)
  match_partially = false
  processed_path = unprocessed_path
  case unprocessed_path
  when String
    if unprocessed_path[-1] == ?*
      unprocessed_path.slice!(-1)
      match_partially = true
    end
    processed_path = parse(unprocessed_path, requirements, default_values)
  when Regexp
    processed_path = [Route::Static::Greedy.new(unprocessed_path)]
  when nil
    match_partially = true
  else
    match_partially = false
  end
  
  if processed_path && !processed_path.first.is_a?(Route::Util::Group)
    group = Usher::Route::Util::Group.new(:all, nil)
    processed_path.each{|p| group << p}
    processed_path = group
  end
  
  paths = processed_path.nil? ? [nil] : Route::Util.expand_path(processed_path)

  paths.each do |path|
    path && path.each_with_index do |part, index|
      part.default_value = default_values[part.name] if part.is_a?(Usher::Route::Variable) && default_values && default_values[part.name]
      case part
      when Usher::Route::Variable::Glob
        if part.look_ahead && !part.look_ahead_priority
          part.look_ahead = nil
          part.look_ahead_priority = true
        else
          part.look_ahead = path[index + 1, path.size].find{|p| !p.is_a?(Usher::Route::Variable) && !router.delimiters.unescaped.include?(p)} || nil
        end
      when Usher::Route::Variable
        if part.look_ahead && !part.look_ahead_priority
          part.look_ahead = nil
          part.look_ahead_priority = true
        else
          part.look_ahead = router.delimiters.first_in(path[index + 1, path.size]) || router.delimiters.unescaped.first
        end
      end
    end
  end

  router.route_class.new(
    unprocessed_path,
    paths,
    router, 
    conditions, 
    requirements, 
    default_values, 
    generate_with,
    match_partially,
    priority
  )
end

#parse(path, requirements = nil, default_values = nil) ⇒ Object 



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# File 'lib/usher/util/parser.rb', line 87

def parse(path, requirements = nil, default_values = nil)
  parts = Usher::Route::Util::Group.new(:all, nil)
  scanner = StringScanner.new(path)

  current_group = parts
  part = nil
  while !scanner.eos?
    part ?
      (part << scanner.scan(@split_regex)) :
      (part = scanner.scan(@split_regex))

    if scanner.match?(/\\/) and !scanner.match?(@delimiters_regex)
      scanner.skip(/\\/)
      part << scanner.getch
      next
    end

    case part[0]
    when ?*
      var_name = part[1, part.size - 1].to_sym
      current_group << Usher::Route::Variable::Glob.new(part[1, part.size - 1], nil, requirements && requirements[var_name])
    when ?:
      var_name = part[1, part.size - 1].to_sym
      current_group << Usher::Route::Variable::Single.new(part[1, part.size - 1], nil, requirements && requirements[var_name])
    when ?{
      pattern = ''
      count = 1
      simple = scanner.scan(/~/)
      variable = scanner.scan(/[!:\*]([^,]+),/)
      until count.zero?
        regex_part = scanner.scan(/\{|\}|[^\{\}]+/)
        case regex_part[0]
        when ?{
          count += 1
        when ?}
          count -= 1
        end
        pattern << regex_part
      end
      pattern.slice!(pattern.length - 1)
      if variable
        variable_class = case variable.slice!(0)
        when ?! then Usher::Route::Variable::Greedy
        when ?* then Usher::Route::Variable::Glob
        when ?: then Usher::Route::Variable::Single
        end
        variable_name = variable[0, variable.size - 1].to_sym
        current_group << variable_class.new(variable_name, Regexp.new(pattern), requirements && requirements[variable_name])
      elsif simple
        static = Usher::Route::Static::Greedy.new(pattern)
        static.generate_with = pattern
        current_group << static
      else
        simple_parts = pattern.split(',', 2)
        static = Usher::Route::Static::Greedy.new(Regexp.new(simple_parts.last))
        static.generate_with = simple_parts.first
        current_group << static
      end
    when ?(
      new_group = Usher::Route::Util::Group.new(:any, current_group)
      current_group << new_group
      current_group = new_group
    when ?)
      current_group = current_group.parent.group_type == :one ? current_group.parent.parent : current_group.parent
    when ?|
      unless current_group.parent.group_type == :one
        detached_group = current_group.parent.pop
        new_group = Usher::Route::Util::Group.new(:one, detached_group.parent)
        detached_group.parent = new_group
        detached_group.group_type = :all
        new_group << detached_group
        new_group.parent << new_group
      end
      current_group.parent << Usher::Route::Util::Group.new(:all, current_group.parent)
      current_group = current_group.parent.last
    when ?\\
      current_group << part[1..-1]
    else
      current_group << part
    end
    part = nil
  end unless !path || path.empty?
  parts
end

#parse_and_expand(path, requirements = nil, default_values = nil) ⇒ Object 



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# File 'lib/usher/util/parser.rb', line 83

def parse_and_expand(path, requirements = nil, default_values = nil)
  Usher::Route::Util.expand_path(parse(path, requirements, default_values))
end