Class: Usher::Util::Parser::ParserInstance

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

Instance Method Summary collapse

Constructor Details

#initialize(router, split_regex) ⇒ ParserInstance

Returns a new instance of ParserInstance.



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

def initialize(router, split_regex)
  @router = router
  @split_regex = split_regex
end

Instance Method Details

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



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# File 'lib/usher/util/parser.rb', line 21

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

  paths = Route::Util.expand_path(unprocessed_path)

  paths.each do |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
        part.look_ahead = path[index + 1, path.size].find{|p| !p.is_a?(Usher::Route::Variable) && !router.delimiter_chars.include?(p[0])} || nil
      when Usher::Route::Variable
        part.look_ahead = path[index + 1, path.size].find{|p| router.delimiter_chars.include?(p[0])} || router.delimiters.first
      end
    end
  end

  Route.new(
    paths,
    router, 
    conditions, 
    requirements, 
    default_values, 
    generate_with,
    match_partially
  )
  
end

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



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# File 'lib/usher/util/parser.rb', line 71

def parse(path, requirements = nil, default_values = nil)
  parts = Usher::Route::Util::Group.new(:all, nil)
  ss = StringScanner.new(path)
  current_group = parts
  while !ss.eos?
    part = ss.scan(@split_regex)
    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
      variable = ss.scan(/[!:\*]([^,]+),/)
      until count.zero?
        regex_part = ss.scan(/\{|\}|[^\{\}]+/)
        case regex_part[0]
        when ?{
          count += 1
        when ?}
          count -= 1
        end
        pattern << regex_part
      end
      pattern.slice!(pattern.length - 1)
      regex = Regexp.new(pattern)
      if variable
        variable_type = variable.slice!(0).chr.to_sym
        variable_class = case variable_type
        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, regex, requirements && requirements[variable_name])
      else
        current_group << regex
      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
    else
      current_group << part
    end
  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 67

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