Class: Rouge::Lexers::ConsoleLexer

Inherits:
Rouge::Lexer show all
Defined in:
lib/rouge/lexers/console.rb

Direct Known Subclasses

IRBLexer

Constant Summary

Constants included from Token::Tokens

Token::Tokens::Num, Token::Tokens::Str

Instance Attribute Summary

Attributes inherited from Rouge::Lexer

#options

Instance Method Summary collapse

Methods inherited from Rouge::Lexer

aliases, all, analyze_text, #as_bool, #as_lexer, #as_list, #as_string, #as_token, assert_utf8!, #bool_option, debug_enabled?, demo, demo_file, desc, disable_debug!, enable_debug!, filenames, find, find_fancy, guess, guess_by_filename, guess_by_mimetype, guess_by_source, guesses, #hash_option, #lex, lex, #lexer_option, #list_option, mimetypes, option, option_docs, #reset!, #string_option, #tag, tag, title, #token_option

Methods included from Token::Tokens

token

Constructor Details

#initializeConsoleLexer

Returns a new instance of ConsoleLexer.


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# File 'lib/rouge/lexers/console.rb', line 16

def initialize(*)
  super
  @prompt = list_option(:prompt) { nil }
  @lang = lexer_option(:lang) { 'shell' }
  @output = lexer_option(:output) { PlainText.new(token: Generic::Output) }
  @comments = bool_option(:comments) { :guess }
end

Instance Method Details

#allow_comments?Boolean

whether to allow comments. if manually specifying a prompt that isn't simply “#”, we flag this to on

Returns:

  • (Boolean)

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# File 'lib/rouge/lexers/console.rb', line 40

def allow_comments?
  case @comments
  when :guess
    @prompt && !@prompt.empty? && !end_chars.include?('#')
  else
    @comments
  end
end

#comment_regexObject


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# File 'lib/rouge/lexers/console.rb', line 87

def comment_regex
  /\A\s*?#/
end

#end_charsObject


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# File 'lib/rouge/lexers/console.rb', line 30

def end_chars
  @end_chars ||= if @prompt.any?
    @prompt.reject { |c| c.empty? }
  else
    %w($ # > ;)
  end
end

#lang_lexerObject


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# File 'lib/rouge/lexers/console.rb', line 57

def lang_lexer
  @lang_lexer ||= case @lang
  when Lexer
    @lang
  when nil
    Shell.new(options)
  when Class
    @lang.new(options)
  when String
    Lexer.find(@lang).new(options)
  end
end

#line_regexObject


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# File 'lib/rouge/lexers/console.rb', line 83

def line_regex
  /(\\.|[^\\])*?(\n|$)/m
end

#output_lexerObject


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# File 'lib/rouge/lexers/console.rb', line 70

def output_lexer
  @output_lexer ||= case @output
  when nil
    PlainText.new(token: Generic::Output)
  when Lexer
    @output
  when Class
    @output.new(options)
  when String
    Lexer.find(@output).new(options)
  end
end

#process_line(input, &output) ⇒ Object


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# File 'lib/rouge/lexers/console.rb', line 99

def process_line(input, &output)
  input.scan(line_regex)

  if input[0] =~ /\A\s*(?:<[.]+>|[.]+)\s*\z/
    puts "console: matched snip #{input[0].inspect}" if @debug
    output_lexer.reset!
    lang_lexer.reset!

    yield Comment, input[0]
  elsif prompt_regex =~ input[0]
    puts "console: matched prompt #{input[0].inspect}" if @debug
    output_lexer.reset!

    yield Generic::Prompt, $&

    # make sure to take care of initial whitespace
    # before we pass to the lang lexer so it can determine where
    # the "real" beginning of the line is
    $' =~ /\A\s*/
    yield Text, $& unless $&.empty?

    lang_lexer.lex($', continue: true, &output)
  elsif comment_regex =~ input[0].strip
    puts "console: matched comment #{input[0].inspect}" if @debug
    output_lexer.reset!
    lang_lexer.reset!

    yield Comment, input[0]
  else
    puts "console: matched output #{input[0].inspect}" if @debug
    lang_lexer.reset!

    output_lexer.lex(input[0], continue: true, &output)
  end
end

#prompt_prefix_regexObject


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# File 'lib/rouge/lexers/console.rb', line 49

def prompt_prefix_regex
  if allow_comments?
    /[^<#]*?/m
  else
    /.*?/m
  end
end

#prompt_regexObject


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# File 'lib/rouge/lexers/console.rb', line 24

def prompt_regex
  @prompt_regex ||= begin
    /^#{prompt_prefix_regex}(?:#{end_chars.map(&Regexp.method(:escape)).join('|')})/
  end
end

#stream_tokens(input, &output) ⇒ Object


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# File 'lib/rouge/lexers/console.rb', line 91

def stream_tokens(input, &output)
  input = StringScanner.new(input)
  lang_lexer.reset!
  output_lexer.reset!

  process_line(input, &output) while !input.eos?
end