GoRuby, an implementation of Ruby written in Go

If anyone wants to help to get the project to the real implementation please ping me or fork it and send a pull request.

• #goruby Channel on Gophers Slack (invites to Gophers Slack are available here)

This project is released under the terms of the MIT License, as found in the LICENSE file.

There is a basic REPL within cmd/girb. It supports multiline expressions and all syntax elements the language supports yet.

To run it ad hoc run go run cmd/girb/main.go and exit the REPL with CTRL-D.

To run the command as one off run go run main.go.

• parse program files
• program file arguments
• Flags
  • -0[octal] specify record separator (\0, if no argument)
  • -a autosplit mode with -n or -p (splits $_ into $F)
  • -c check syntax only
  • -Cdirectory cd to directory before executing your script
  • -d set debugging flags (set $DEBUG to true)
  • -e 'command' one line of script. Several -e's allowed. Omit [programfile]
  • -Eex[:in] specify the default external and internal character encodings
  • -Fpattern split() pattern for autosplit (-a)
  • -i[extension] edit ARGV files in place (make backup if extension supplied)
  • -Idirectory specify $LOAD_PATH directory (may be used more than once)
  • -l enable line ending processing
  • -n assume 'while gets(); ... end' loop around your script
  • -p assume loop like -n but print line also like sed
  • -rlibrary require the library before executing your script
  • -s enable some switch parsing for switches after script name
  • -S look for the script using PATH environment variable
  • -T[level=1] turn on tainting checks
  • -v print version number, then turn on verbose mode
  • -w turn warnings on for your script
  • -W[level=2] set warning level; 0=silence, 1=medium, 2=verbose
  • -x[directory] strip off text before #!ruby line and perhaps cd to directory
  • -h show this message, --help for more info

• parse program files
• program file arguments
• Flags
  • -f Suppress read of ~/.irbrc
  • -m Bc mode (load mathn, fraction or matrix are available)
  • -d Set $DEBUG to true (same as `ruby -d')
  • -r load-module Same as `ruby -r'
  • -I path Specify $LOAD_PATH directory
  • -U Same as ruby -U
  • -E enc Same as ruby -E
  • -w Same as ruby -w
  • -W[level=2] Same as ruby -W
  • --context-mode n Set n[0-3] to method to create Binding Object, when new workspace was created
  • --echo Show result(default)
  • --noecho Don't show result
  • --inspect Use `inspect' for output (default except for bc mode)
  • --noinspect Don't use inspect for output
  • --readline Use Readline extension module
  • --noreadline Don't use Readline extension module
  • --prompt prompt-mode/--prompt-mode prompt-mode Switch prompt mode. Pre-defined prompt modes are default', simple', xmp' and inf-ruby'
  • --inf-ruby-mode Use prompt appropriate for inf-ruby-mode on emacs. Suppresses --readline.
  • --sample-book-mode/--simple-prompt Simple prompt mode
  • --noprompt No prompt mode
  • --single-irb Share self with sub-irb.
  • --tracer Display trace for each execution of commands.
  • --back-trace-limit n Display backtrace top n and tail n. The default value is 16.
  • --irb_debug n Set internal debug level to n (not for popular use)
  • --verbose Show details
  • --noverbose Don't show details
  • -v, --version Print the version of irb
  • -h, --help Print help
  • -- Separate options of irb from the list of command-line args

• everything is an object
  • allow method calls on everything
  • operators are method calls
• full UTF8 support
  • Unicode identifier
  • Unicode symbols
• functions
  • with parens
  • without parens
  • return keyword
  • default values for parameters
  • keyword arguments
  • block arguments
  • hash as last argument without braces
• function calls
  • with parens
  • without parens
  • with block arguments
• conditionals
  • if
  • if/else
  • if/elif/else
  • tenary ? :
  • unless
  • unless/else
  • case
  • ||
  • &&
• control flow
  • for loop
  • while loop
  • until loop
  • break
  • next
  • redo
  • flip flop
• numbers
  • integers
    • integer arithmetics
    • integers 1234
    • integers with underscores 1_234
    • decimal numbers 0d170, 0D170
    • octal numbers 0252, 0o252, 0O252
    • hexadecimal numbers 0xaa, 0xAa, 0xAA, 0Xaa, 0XAa, 0XaA
    • binary numbers 0b10101010, 0B10101010
  • floats
    • float arithmetics
    • 12.34
    • 1234e-2
    • 1.234E1
    • floats with underscores 2.2_22
• booleans
• strings
  • double quoted
  • single quoted
  • character literals (?\n, ?a,...)
  • %q{}
  • %Q{}
  • heredoc
    • without indentation (<<EOF)
    • indented (<<-EOF)
    • “squiggly” heredoc <<~
    • quoted heredoc
      • single quotes <<-'HEREDOC'
      • double quotes <<-"HEREDOC"
      • backticks <<-`HEREDOC`"
  • escaped characters
    • \a bell, ASCII 07h (BEL)
    • \b backspace, ASCII 08h (BS)
    • \t horizontal tab, ASCII 09h (TAB)
    • \n newline (line feed), ASCII 0Ah (LF)
    • \v vertical tab, ASCII 0Bh (VT)
    • \f form feed, ASCII 0Ch (FF)
    • \r carriage return, ASCII 0Dh (CR)
    • \e escape, ASCII 1Bh (ESC)
    • \s space, ASCII 20h (SPC)
    • \\ backslash, \
    • \nnn octal bit pattern, where nnn is 1-3 octal digits ([0-7])
    • \xnn hexadecimal bit pattern, where nn is 1-2 hexadecimal digits ([0-9a-fA-F])
    • \unnnn Unicode character, where nnnn is exactly 4 hexadecimal digits ([0-9a-fA-F])
    • \u{nnnn ...} Unicode character(s), where each nnnn is 1-6 hexadecimal digits ([0-9a-fA-F])
    • \cx or \C-x control character, where x is an ASCII printable character
    • \M-x meta character, where x is an ASCII printable character
    • \M-\C-x meta control character, where x is an ASCII printable character
    • \M-\cx same as above
    • \c\M-x same as above
    • \c? or \C-? delete, ASCII 7Fh (DEL)
  • interpolation #{}
  • automatic concatenation
• arrays
  • array literal [1,2]
  • array indexing arr[2]
  • splat
  • array decomposition
  • implicit array assignment
  • array of strings %w{}
  • array of symbols %i{}
• nil
• hashes
  • literal with => notation
  • literal with key: notation
  • indexing hash[:foo]
  • every Ruby Object can be a hash key
• symbols
  • :symbol
  • :"symbol"
  • :"symbol" with interpolation
  • :'symbol'
  • %s{symbol}
  • singleton symbols
• regexp
  • /regex/
  • %r{regex}
• ranges
  • .. inclusive
  • ... exclusive
• procs ->
• variables
  • variable assignments
  • globals
• operators
  • +
  • -
  • /
  • *
  • !
  • <
  • >
  • ** (pow)
  • % (modulus)
  • & (AND)
  • ^ (XOR)
  • >> (right shift)
  • << (left shift, append)
  • == (equal)
  • != (not equal)
  • === (case equality)
  • =~ (pattern match)
  • !~ (does not match)
  • <=> (comparison or spaceship operator)
  • <= (less or equal)
  • >= (greater or equal)
  • assignment operators
    • +=
    • -=
    • /=
    • *=
    • %=
    • **=
    • &=
    • |=
    • ^=
    • <<=
    • >>=
    • ||=
    • &&=
• function blocks (procs)
• error handling
  • begin/rescue
  • ensure
  • retry
• constants
• scope operator ::
• classes
  • class objects
  • class Class
  • instance variables
  • class variables
  • class methods
  • instance methods
  • method overrides
  • private
  • protected
  • public
  • inheritance
  • constructors
  • new
  • self
  • singleton classes (also known as the metaclass or eigenclass) class << self
  • assigment methods
  • self defined classes
  • self defined classes with inheritance
• modules
• object main
• comments '#'