Class: Rux::Parser

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

Defined Under Namespace

Classes: TagMismatchError, UnexpectedTokenError

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(lexer) ⇒ Parser

Returns a new instance of Parser.



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# File 'lib/rux/parser.rb', line 22

def initialize(lexer)
  @lexer = lexer
  @stack = []
  @current = get_next
end

Class Method Details

.parse(str) ⇒ Object 



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# File 'lib/rux/parser.rb', line 15

def parse(str)
  buffer = ::Parser::Source::Buffer.new('(source)', source: str)
  lexer = ::Rux::Lexer.new(buffer)
  new(lexer).parse
end

.parse_file(path) ⇒ Object 



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# File 'lib/rux/parser.rb', line 9

def parse_file(path)
  buffer = ::Parser::Source::Buffer.new(path).read
  lexer = ::Rux::Lexer.new(buffer)
  new(lexer).parse
end

Instance Method Details

#parse ⇒ Object 



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# File 'lib/rux/parser.rb', line 28

def parse
  curlies = 1
  children = []

  loop do
    type = type_of(current)
    break unless type

    case type
      when :tLCURLY, :tLBRACE, :tRUX_LITERAL_RUBY_CODE_START
        curlies += 1
      when :tRCURLY, :tRBRACE, :tRUX_LITERAL_RUBY_CODE_END
        curlies -= 1
    end

    break if curlies == 0

    if rb = ruby
      children << rb
    elsif type_of(current) == :tRUX_TAG_OPEN_START
      children << tag
    else
      raise UnexpectedTokenError,
        'expected ruby code or the start of a rux tag but found '\
          "#{type_of(current)} instead"
    end
  end

  AST::ListNode.new(children)
end