Class: Rattler::Util::ParserCLI

Inherits:
Object
  • Object
show all
Defined in:
lib/rattler/util/parser_cli.rb

Overview

ParserCLI defines a command line interface for generated parsers.

Direct Known Subclasses

GrammarCLI

Constant Summary collapse

@@graph_formats =

The supported graph file formats

%w{jpg png svg pdf ps ps2 eps}

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(parser_class) ⇒ ParserCLI

Create a new command line interface for the given parser class

Parameters:

  • parser_class (Class) —

    the parser class to run the command line interface for



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# File 'lib/rattler/util/parser_cli.rb', line 23

def initialize(parser_class)
  @parser_class = parser_class

  OptionParser.new do |opts|

    opts.banner = "Usage: #{File.basename($0)} [filenames] [options]"

    opts.separator ''

    opts.on '-g', '--graphviz',
            'Display the parse tree using GraphViz dotty' do |g|
      @graphviz = {:dot => '|dotty'}
    end

    @@graph_formats.each do |format|
      a = 'aefhilmnorsx'.include?(format[0]) ? 'an' : 'a'
      desc = "#{format.upcase} file"
      opts.on "--#{format} FILENAME",
              "Output the parse tree as #{a} #{desc} using GraphViz" do |f|
        @graphviz = {format => f}
      end
    end

    opts.on '-f', '--file FILENAME',
            'Output the parse tree as a GraphViz DOT language file' do |file|
      @graphviz = {:dot => file}
    end

    opts.on '-d', '--dot',
            'Output the parse tree in the GraphViz DOT language' do |d|
      @graphviz = {:dot => nil}
    end

    opts.separator ''

    opts.on_tail '-h', '--help', 'Show this message' do
      abort "#{opts}\n"
    end
  end.parse!(ARGV)
end

Class Method Details

.run(parser_class) ⇒ Object

Create and run the command line interface for the given parser class

Parameters:

  • parser_class (Class) —

    the parser class to run the command line interface for



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# File 'lib/rattler/util/parser_cli.rb', line 15

def self.run(parser_class)
  self.new(parser_class).run
end

Instance Method Details

#run ⇒ Object

Run the command line interface



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# File 'lib/rattler/util/parser_cli.rb', line 65

def run
  show_result @parser_class.parse!(ARGF.read)
rescue Rattler::Runtime::SyntaxError => e
  puts e
end