Class: Sass::Exec::Base

Inherits:
Object
  • Object
show all
Defined in:
lib/sass/exec/base.rb

Overview

The abstract base class for Sass executables.

Direct Known Subclasses

SassConvert, SassScss

Constant Summary collapse

COLORS =
{:red => 31, :green => 32, :yellow => 33}

Instance Method Summary collapse

Constructor Details

#initialize(args) ⇒ Base



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# File 'lib/sass/exec/base.rb', line 7

def initialize(args)
  @args = args
  @options = {}
end

Instance Method Details

#color(color, str) ⇒ String (protected)

Wraps the given string in terminal escapes causing it to have the given color. If terminal escapes aren't supported on this platform, just returns the string instead.



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# File 'lib/sass/exec/base.rb', line 148

def color(color, str)
  raise "[BUG] Unrecognized color #{color}" unless COLORS[color]

  # Almost any real Unix terminal will support color,
  # so we just filter for Windows terms (which don't set TERM)
  # and not-real terminals, which aren't ttys.
  return str if ENV["TERM"].nil? || ENV["TERM"].empty? || !STDOUT.tty?
  "\e[#{COLORS[color]}m#{str}\e[0m"
end

#encoding_option(opts) (protected)

Set an option for specifying Encoding.default_external.



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# File 'lib/sass/exec/base.rb', line 90

def encoding_option(opts)
  encoding_desc = 'Specify the default encoding for input files.'
  opts.on('-E', '--default-encoding ENCODING', encoding_desc) do |encoding|
    Encoding.default_external = encoding
  end
end

#get_line(exception) ⇒ String (protected)

Finds the line of the source template on which an exception was raised.



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# File 'lib/sass/exec/base.rb', line 67

def get_line(exception)
  # SyntaxErrors have weird line reporting
  # when there's trailing whitespace
  if exception.is_a?(::SyntaxError)
    return (exception.message.scan(/:(\d+)/).first || ["??"]).first
  end
  (exception.backtrace[0].scan(/:(\d+)/).first || ["??"]).first
end

#parse

Parses the command-line arguments and runs the executable. This does not handle exceptions or exit the program.

See Also:



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# File 'lib/sass/exec/base.rb', line 46

def parse
  @opts = OptionParser.new(&method(:set_opts))
  @opts.parse!(@args)

  process_result

  @options
end

#parse!

Parses the command-line arguments and runs the executable. Calls Kernel#exit at the end, so it never returns.

See Also:



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# File 'lib/sass/exec/base.rb', line 16

def parse!
  begin
    parse
  rescue Exception => e
    # Exit code 65 indicates invalid data per
    # http://www.freebsd.org/cgi/man.cgi?query=sysexits. Setting it via
    # at_exit is a bit of a hack, but it allows us to rethrow when --trace
    # is active and get both the built-in exception formatting and the
    # correct exit code.
    at_exit {exit Sass::Util.windows? ? 13 : 65} if e.is_a?(Sass::SyntaxError)

    raise e if @options[:trace] || e.is_a?(SystemExit)

    if e.is_a?(Sass::SyntaxError)
      $stderr.puts e.sass_backtrace_str("standard input")
    else
      $stderr.print "#{e.class}: " unless e.class == RuntimeError
      $stderr.puts e.message.to_s
    end
    $stderr.puts "  Use --trace for backtrace."

    exit 1
  end
  exit 0
end

#process_result (protected)

Processes the options set by the command-line arguments. In particular, sets @options[:input] and @options[:output] to appropriate IO streams.

This is meant to be overridden by subclasses so they can run their respective programs.



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# File 'lib/sass/exec/base.rb', line 102

def process_result
  input, output = @options[:input], @options[:output]
  args = @args.dup
  input ||=
    begin
      filename = args.shift
      @options[:filename] = filename
      open_file(filename) || $stdin
    end
  @options[:output_filename] = args.shift
  output ||= @options[:output_filename] || $stdout
  @options[:input], @options[:output] = input, output
end

#puts(*args) (protected)

Same as Kernel.puts, but doesn't print anything if the --quiet option is set.



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# File 'lib/sass/exec/base.rb', line 134

def puts(*args)
  return if @options[:for_engine][:quiet]
  Kernel.puts(*args)
end

#puts_action(name, color, arg) (protected)

Prints a status message about performing the given action, colored using the given color (via terminal escapes) if possible.



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# File 'lib/sass/exec/base.rb', line 125

def puts_action(name, color, arg)
  return if @options[:for_engine][:quiet]
  printf color(color, "%11s %s\n"), name, arg
  STDOUT.flush
end

#set_opts(opts) (protected)

Tells optparse how to parse the arguments available for all executables.

This is meant to be overridden by subclasses so they can add their own options.



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# File 'lib/sass/exec/base.rb', line 83

def set_opts(opts)
  Sass::Util.abstract(this)
end

#to_sString



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# File 'lib/sass/exec/base.rb', line 56

def to_s
  @opts.to_s
end

#write_output(text, destination) (protected)



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# File 'lib/sass/exec/base.rb', line 158

def write_output(text, destination)
  if destination.is_a?(String)
    open_file(destination, 'w') {|file| file.write(text)}
  else
    destination.write(text)
  end
end