Class: Condenser::JSAnalyzer

Inherits:
Object
  • Object
show all
Includes:
ParseHelpers
Defined in:
lib/condenser/processors/js_analyzer.rb

Instance Attribute Summary

Attributes included from ParseHelpers

#matched

Class Method Summary collapse

Instance Method Summary collapse

Methods included from ParseHelpers

#current_line, #cursor, #eos?, #forward, #gobble, #next_word, #peek, #pre_match, #rewind, #scan_until, #seek

Class Method Details

.call(environment, input) ⇒ Object 



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# File 'lib/condenser/processors/js_analyzer.rb', line 10

def self.call(environment, input)
  new.call(environment, input)
end

.setup(env) ⇒ Object 



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# File 'lib/condenser/processors/js_analyzer.rb', line 7

def self.setup(env)
end

Instance Method Details

#call(environment, input) ⇒ Object

Raises:



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# File 'lib/condenser/processors/js_analyzer.rb', line 14

def call(environment, input)
  seek(0)
  @sourcefile = input[:source_file]
  @source = input[:source]
  @stack =  [:main]
  @previous = [[]]

  input[:linked_assets] ||= Set.new
  input[:export_dependencies] ||= Set.new

  scan_until(/\A(\/\/[^\n]*(\n|\z))*/)
  if matched
    directives = matched.split(/\n/).map { |l| l.delete_prefix("//").strip }
    directives.each do |directive|
      if directive.start_with?('depends_on')
        input[:process_dependencies] << directive.sub(/\Adepends_on\s+/, '')
      end
    end
  end
  
  last_postion = nil
  last_stack = nil
  while !eos?
    case @stack.last

    when :tick_value
      scan_until(/(\$\{|\`)/)
      case matched
      when '`'
        @stack.pop if pre_match[-1] != "\\" && pre_match[-1] != "\\"
      when '${'
        @stack << :tick_statment
      end

    when :import
      scan_until(/[\"\'\`\(]/)
      dynamic = if matched == "("
        scan_until(/[\"\'\`]/)
        true
      end
      
      filename = case matched
      when "\""
        double_quoted_value
      when "'"
        single_quoted_value
      when '`'
        tick_quoted_value
      end

      input[:type] = "module"
      if dynamic
        input[:process_dependencies] << filename
        input[:linked_assets] << filename 
      else
        input[:export_dependencies] << filename
      end
      scan_until(/(;|\n|\))/)
      @stack.pop

    when :export
      input[:type] = "module"
      input[:exports] = true;
      input[:default_export] = true if gobble(/\s+default/)
      gobble(/\s+/)

      if gobble(/\{/)
        @stack << :brackets
        @previous << []
      elsif gobble(/\*/)
        @stack << :export_from
      else
        @stack.pop
      end

    when :export_from
      if gobble(/\s+from\s+/)
        scan_until(/\"|\'/)
        input[:export_dependencies] <<  case matched
        when '"'
          double_quoted_value
        when "'"
          single_quoted_value
        end
      end
      @stack.pop
      @stack.pop
      
    else
      scan_until(/(\/\/|\/\*|\/|\(|\)|\{|\}|\"|\'|\`|export(?![[:alnum:]])|import(?![[:alnum:]])|\z)/)

      case matched
      when '//'
        scan_until(/(\n|\z)/)
        @previous.last << :single_line_comment
      when '/*'
        scan_until(/\*\//)
        @previous.last << :multi_line_comment
      when '"'
        double_quoted_value
        @previous.last << :double_quoted_value
      when "'"
        single_quoted_value
        @previous.last << :single_quoted_value
      when '`'
        @stack << :tick_value
      when '/'
        if pre_match.match(/(\W|\A)(void|typeof|return|export)\z/)
          regex_value
        elsif match_index = @source.rindex(/(\w+|\)|\])(\s*)\//m, @index)
          match = @source.match(/(\w+|\)|\])(\s*)\//, match_index)
          
          x = @previous.last.dup
          while match[2]&.index("\n") && [:single_line_comment, :multi_line_comment].include?(x.last)
            case x.last
            when :single_line_comment
              match_index = @source.rindex(/[^\n]*\/\/[^\n]*\s*/m, match.begin(2))
              match = @source.match(/(\w+|\)|\])\s*\//, match_index)
            when :multi_line_comment
              match_index = @source.rindex(/\/\*/m, match.begin(2))
              match = @source.match(/(\w+|\)|\])\s*\//, match_index)
            end
          end

          if @previous.last.last == :loop && match[1] =~ /\)\z/
            regex_value
          elsif %w(void typeof return export).include?(match[1])
            regex_value
          elsif match[0].length + match_index != @index
            regex_value
          elsif match[1].strip.empty?
            regex_value
          end
        else
          regex_value
        end
      when '('
        @stack << if pre_match =~ /\W*(for|while)\s*\z/
          :loop
        else
          :parenthesis
        end
      when ')'
        raise unexptected_token(")") if @stack.last != :parenthesis && @stack.last != :loop
        @previous.last << @stack.pop
      when '{'
        @stack.push :brackets
        @previous << []
      when '}'
        case @stack.last
        when :tick_statment
          @stack.pop
        when :brackets
          @stack.pop
          @previous.pop
          @previous.last << :brackets
          if @stack.last == :export
            @stack.pop
            @stack << :export_from if peek(/\s+from/i)
          end
        else
          raise unexptected_token("}")
        end
      when 'export'
        if @stack.last == :main
          @stack << :export
        end
      when 'import'
        @stack << :import
      else
        @stack.pop
      end
    end

    if last_postion == @index && last_stack == @stack.last
      syntax_error = Condenser::SyntaxError.new("Error parsing JS file with JSAnalyzer")
      syntax_error.instance_variable_set(:@path, @sourcefile)
      raise Condenser::SyntaxError, "Error parsing JS file with JSAnalyzer"
    else
      last_postion = @index
      last_stack = @stack.last
    end
  end
  
  raise Condenser::SyntaxError, "Unexpected EOF" if !@stack.empty? && @stack.last != :main
end

#double_quoted_value ⇒ Object 



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# File 'lib/condenser/processors/js_analyzer.rb', line 216

def double_quoted_value
  ret_value = String.new

  while scan_until(/[\"\n\\]/)
    case matched
    when "\n"
      raise unexptected_token("\\n")
    when "\\"
      ret_value << pre_match << matched << gobble(1)
    when "\""
      ret_value << pre_match
      return ret_value
    else
      ret_value << match
    end
  end
end

#regex_value ⇒ Object 



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# File 'lib/condenser/processors/js_analyzer.rb', line 262

def regex_value
  ret_value = String.new

  regex_stack =  ['/']
  while !regex_stack.empty?
    
    scan_until(/[\/\[\]]/)
    escaped = pre_match[-1] == "\\" && pre_match[-2] != "\\"
    ret_value << pre_match
    case matched
    when "["
      regex_stack << '[' if !escaped && regex_stack.last != "["
      ret_value << matched
    when "]"
      regex_stack.pop if !escaped && regex_stack.last == "["
      ret_value << matched
    when "/"
      # From https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Regular_expressions/Character_class
      # 
      # The lexical grammar does a very rough parse of regex literals, so
      # that it does not end the regex literal at a / character which appears
      # within a character class. This means /[/]/ is valid without needing
      # to escape the /.
      if !escaped && regex_stack.last != "[" && regex_stack.pop != "/"
        raise unexptected_token("/")
      else
        ret_value << matched
      end
    end
  end

  ret_value
end

#single_quoted_value ⇒ Object 



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# File 'lib/condenser/processors/js_analyzer.rb', line 234

def single_quoted_value
  ret_value = String.new

  while scan_until(/[\'\n]/)
    if matched == "\n"
      raise unexptected_token("\\n")
    elsif matched == "\'" && pre_match[-1] != "\\"
      ret_value << pre_match
      return ret_value
    else
      ret_value << pre_match
    end
  end
end

#tick_quoted_value ⇒ Object 



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# File 'lib/condenser/processors/js_analyzer.rb', line 249

def tick_quoted_value
  ret_value = String.new

  while scan_until(/[\`]/)
    if matched == "\`" && pre_match[-1] != "\\"
      ret_value << pre_match
      return ret_value
    else
      ret_value << pre_match
    end
  end
end

#unexptected_token(token) ⇒ Object 



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# File 'lib/condenser/processors/js_analyzer.rb', line 201

def unexptected_token(token)
  start = (@source.rindex("\n", @old_index) || 0) + 1
  uptop = @source.index("\n", @index) || (@old_index + @matched.length)
  lineno = @source[0..start].count("\n") + 1

  message = "Unexpected token #{token} #{@sourcefile} #{lineno.to_s.rjust(4)}:#{(@index-start)}"
  message << "\n#{lineno.to_s.rjust(4)}: " << @source[start..uptop]
  message << "\n      #{'-'* ([@index-1-start,1].max)}#{'^'*([@matched.length,1].max)}"
  message << "\n"
  
  syntax_error = Condenser::SyntaxError.new(message)
  syntax_error.instance_variable_set(:@path, @sourcefile)
  syntax_error
end