зеркало из https://github.com/github/ruby.git
1594 строки
50 KiB
Ruby
1594 строки
50 KiB
Ruby
# frozen_string_literal: true
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# :markup: markdown
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# irb.rb - irb main module
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# by Keiju ISHITSUKA(keiju@ruby-lang.org)
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#
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require "ripper"
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require "reline"
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require_relative "irb/init"
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require_relative "irb/context"
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require_relative "irb/default_commands"
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require_relative "irb/ruby-lex"
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require_relative "irb/statement"
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require_relative "irb/history"
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require_relative "irb/input-method"
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require_relative "irb/locale"
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require_relative "irb/color"
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require_relative "irb/version"
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require_relative "irb/easter-egg"
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require_relative "irb/debug"
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require_relative "irb/pager"
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# ## IRB
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#
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# Module IRB ("Interactive Ruby") provides a shell-like interface that supports
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# user interaction with the Ruby interpreter.
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#
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# It operates as a *read-eval-print loop*
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# ([REPL](https://en.wikipedia.org/wiki/Read%E2%80%93eval%E2%80%93print_loop))
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# that:
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#
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# * ***Reads*** each character as you type. You can modify the IRB context to
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# change the way input works. See [Input](rdoc-ref:IRB@Input).
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# * ***Evaluates*** the code each time it has read a syntactically complete
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# passage.
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# * ***Prints*** after evaluating. You can modify the IRB context to change
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# the way output works. See [Output](rdoc-ref:IRB@Output).
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#
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#
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# Example:
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#
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# $ irb
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# irb(main):001> File.basename(Dir.pwd)
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# => "irb"
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# irb(main):002> Dir.entries('.').size
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# => 25
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# irb(main):003* Dir.entries('.').select do |entry|
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# irb(main):004* entry.start_with?('R')
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# irb(main):005> end
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# => ["README.md", "Rakefile"]
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#
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# The typed input may also include [\IRB-specific
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# commands](rdoc-ref:IRB@IRB-Specific+Commands).
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#
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# As seen above, you can start IRB by using the shell command `irb`.
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#
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# You can stop an IRB session by typing command `exit`:
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#
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# irb(main):006> exit
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# $
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#
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# At that point, IRB calls any hooks found in array `IRB.conf[:AT_EXIT]`, then
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# exits.
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#
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# ## Startup
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#
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# At startup, IRB:
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#
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# 1. Interprets (as Ruby code) the content of the [configuration
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# file](rdoc-ref:IRB@Configuration+File) (if given).
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# 2. Constructs the initial session context from [hash
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# IRB.conf](rdoc-ref:IRB@Hash+IRB.conf) and from default values; the hash
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# content may have been affected by [command-line
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# options](rdoc-ref:IB@Command-Line+Options), and by direct assignments in
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# the configuration file.
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# 3. Assigns the context to variable `conf`.
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# 4. Assigns command-line arguments to variable `ARGV`.
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# 5. Prints the [prompt](rdoc-ref:IRB@Prompt+and+Return+Formats).
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# 6. Puts the content of the [initialization
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# script](rdoc-ref:IRB@Initialization+Script) onto the IRB shell, just as if
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# it were user-typed commands.
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#
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#
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# ### The Command Line
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#
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# On the command line, all options precede all arguments; the first item that is
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# not recognized as an option is treated as an argument, as are all items that
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# follow.
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#
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# #### Command-Line Options
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#
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# Many command-line options affect entries in hash `IRB.conf`, which in turn
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# affect the initial configuration of the IRB session.
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#
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# Details of the options are described in the relevant subsections below.
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#
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# A cursory list of the IRB command-line options may be seen in the [help
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# message](https://raw.githubusercontent.com/ruby/irb/master/lib/irb/lc/help-message),
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# which is also displayed if you use command-line option `--help`.
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#
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# If you are interested in a specific option, consult the
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# [index](rdoc-ref:doc/irb/indexes.md@Index+of+Command-Line+Options).
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#
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# #### Command-Line Arguments
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#
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# Command-line arguments are passed to IRB in array `ARGV`:
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#
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# $ irb --noscript Foo Bar Baz
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# irb(main):001> ARGV
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# => ["Foo", "Bar", "Baz"]
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# irb(main):002> exit
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# $
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#
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# Command-line option `--` causes everything that follows to be treated as
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# arguments, even those that look like options:
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#
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# $ irb --noscript -- --noscript -- Foo Bar Baz
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# irb(main):001> ARGV
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# => ["--noscript", "--", "Foo", "Bar", "Baz"]
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# irb(main):002> exit
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# $
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#
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# ### Configuration File
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#
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# You can initialize IRB via a *configuration file*.
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#
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# If command-line option `-f` is given, no configuration file is looked for.
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#
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# Otherwise, IRB reads and interprets a configuration file if one is available.
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#
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# The configuration file can contain any Ruby code, and can usefully include
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# user code that:
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#
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# * Can then be debugged in IRB.
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# * Configures IRB itself.
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# * Requires or loads files.
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#
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#
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# The path to the configuration file is the first found among:
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#
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# * The value of variable `$IRBRC`, if defined.
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# * The value of variable `$XDG_CONFIG_HOME/irb/irbrc`, if defined.
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# * File `$HOME/.irbrc`, if it exists.
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# * File `$HOME/.config/irb/irbrc`, if it exists.
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# * File `.irbrc` in the current directory, if it exists.
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# * File `irb.rc` in the current directory, if it exists.
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# * File `_irbrc` in the current directory, if it exists.
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# * File `$irbrc` in the current directory, if it exists.
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#
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#
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# If the search fails, there is no configuration file.
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#
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# If the search succeeds, the configuration file is read as Ruby code, and so
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# can contain any Ruby programming you like.
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#
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# Method `conf.rc?` returns `true` if a configuration file was read, `false`
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# otherwise. Hash entry `IRB.conf[:RC]` also contains that value.
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#
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# ### Hash `IRB.conf`
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#
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# The initial entries in hash `IRB.conf` are determined by:
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#
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# * Default values.
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# * Command-line options, which may override defaults.
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# * Direct assignments in the configuration file.
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#
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#
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# You can see the hash by typing `IRB.conf`.
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#
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# Details of the entries' meanings are described in the relevant subsections
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# below.
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#
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# If you are interested in a specific entry, consult the
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# [index](rdoc-ref:doc/irb/indexes.md@Index+of+IRB.conf+Entries).
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#
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# ### Notes on Initialization Precedence
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#
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# * Any conflict between an entry in hash `IRB.conf` and a command-line option
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# is resolved in favor of the hash entry.
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# * Hash `IRB.conf` affects the context only once, when the configuration file
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# is interpreted; any subsequent changes to it do not affect the context and
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# are therefore essentially meaningless.
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#
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#
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# ### Initialization Script
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#
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# By default, the first command-line argument (after any options) is the path to
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# a Ruby initialization script.
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#
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# IRB reads the initialization script and puts its content onto the IRB shell,
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# just as if it were user-typed commands.
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#
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# Command-line option `--noscript` causes the first command-line argument to be
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# treated as an ordinary argument (instead of an initialization script);
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# `--script` is the default.
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#
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# ## Input
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#
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# This section describes the features that allow you to change the way IRB input
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# works; see also [Input and Output](rdoc-ref:IRB@Input+and+Output).
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#
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# ### Input Command History
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#
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# By default, IRB stores a history of up to 1000 input commands in a file named
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# `.irb_history`. The history file will be in the same directory as the
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# [configuration file](rdoc-ref:IRB@Configuration+File) if one is found, or in
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# `~/` otherwise.
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#
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# A new IRB session creates the history file if it does not exist, and appends
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# to the file if it does exist.
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#
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# You can change the filepath by adding to your configuration file:
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# `IRB.conf[:HISTORY_FILE] = *filepath*`, where *filepath* is a string filepath.
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#
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# During the session, method `conf.history_file` returns the filepath, and
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# method `conf.history_file = *new_filepath*` copies the history to the file at
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# *new_filepath*, which becomes the history file for the session.
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#
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# You can change the number of commands saved by adding to your configuration
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# file: `IRB.conf[:SAVE_HISTORY] = *n*`, where *n* is one of:
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#
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# * Positive integer: the number of commands to be saved.
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# * Negative integer: all commands are to be saved.
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# * Zero or `nil`: no commands are to be saved.
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#
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#
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# During the session, you can use methods `conf.save_history` or
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# `conf.save_history=` to retrieve or change the count.
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#
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# ### Command Aliases
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#
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# By default, IRB defines several command aliases:
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#
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# irb(main):001> conf.command_aliases
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# => {:"$"=>:show_source, :"@"=>:whereami}
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#
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# You can change the initial aliases in the configuration file with:
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#
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# IRB.conf[:COMMAND_ALIASES] = {foo: :show_source, bar: :whereami}
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#
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# You can replace the current aliases at any time with configuration method
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# `conf.command_aliases=`; Because `conf.command_aliases` is a hash, you can
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# modify it.
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#
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# ### End-of-File
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#
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# By default, `IRB.conf[:IGNORE_EOF]` is `false`, which means that typing the
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# end-of-file character `Ctrl-D` causes the session to exit.
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#
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# You can reverse that behavior by adding `IRB.conf[:IGNORE_EOF] = true` to the
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# configuration file.
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#
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# During the session, method `conf.ignore_eof?` returns the setting, and method
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# `conf.ignore_eof = *boolean*` sets it.
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#
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# ### SIGINT
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#
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# By default, `IRB.conf[:IGNORE_SIGINT]` is `true`, which means that typing the
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# interrupt character `Ctrl-C` causes the session to exit.
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#
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# You can reverse that behavior by adding `IRB.conf[:IGNORE_SIGING] = false` to
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# the configuration file.
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#
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# During the session, method `conf.ignore_siging?` returns the setting, and
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# method `conf.ignore_sigint = *boolean*` sets it.
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#
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# ### Automatic Completion
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#
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# By default, IRB enables [automatic
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# completion](https://en.wikipedia.org/wiki/Autocomplete#In_command-line_interpr
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# eters):
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#
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# You can disable it by either of these:
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#
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# * Adding `IRB.conf[:USE_AUTOCOMPLETE] = false` to the configuration file.
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# * Giving command-line option `--noautocomplete` (`--autocomplete` is the
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# default).
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#
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#
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# Method `conf.use_autocomplete?` returns `true` if automatic completion is
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# enabled, `false` otherwise.
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#
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# The setting may not be changed during the session.
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#
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# ### Automatic Indentation
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#
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# By default, IRB automatically indents lines of code to show structure (e.g.,
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# it indent the contents of a block).
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#
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# The current setting is returned by the configuration method
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# `conf.auto_indent_mode`.
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#
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# The default initial setting is `true`:
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#
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# irb(main):001> conf.auto_indent_mode
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# => true
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# irb(main):002* Dir.entries('.').select do |entry|
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# irb(main):003* entry.start_with?('R')
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# irb(main):004> end
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# => ["README.md", "Rakefile"]
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#
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# You can change the initial setting in the configuration file with:
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#
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# IRB.conf[:AUTO_INDENT] = false
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#
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# Note that the *current* setting *may not* be changed in the IRB session.
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#
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# ### Input Method
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#
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# The IRB input method determines how command input is to be read; by default,
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# the input method for a session is IRB::RelineInputMethod. Unless the
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# value of the TERM environment variable is 'dumb', in which case the
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# most simplistic input method is used.
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#
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# You can set the input method by:
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#
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# * Adding to the configuration file:
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#
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# * `IRB.conf[:USE_SINGLELINE] = true` or `IRB.conf[:USE_MULTILINE]=
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# false` sets the input method to IRB::ReadlineInputMethod.
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# * `IRB.conf[:USE_SINGLELINE] = false` or `IRB.conf[:USE_MULTILINE] =
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# true` sets the input method to IRB::RelineInputMethod.
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#
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#
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# * Giving command-line options:
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#
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# * `--singleline` or `--nomultiline` sets the input method to
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# IRB::ReadlineInputMethod.
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# * `--nosingleline` or `--multiline` sets the input method to
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# IRB::RelineInputMethod.
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# * `--nosingleline` together with `--nomultiline` sets the
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# input to IRB::StdioInputMethod.
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#
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#
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# Method `conf.use_multiline?` and its synonym `conf.use_reline` return:
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#
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# * `true` if option `--multiline` was given.
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# * `false` if option `--nomultiline` was given.
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# * `nil` if neither was given.
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#
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#
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# Method `conf.use_singleline?` and its synonym `conf.use_readline` return:
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#
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# * `true` if option `--singleline` was given.
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# * `false` if option `--nosingleline` was given.
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# * `nil` if neither was given.
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#
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#
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# ## Output
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#
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# This section describes the features that allow you to change the way IRB
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# output works; see also [Input and Output](rdoc-ref:IRB@Input+and+Output).
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#
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# ### Return-Value Printing (Echoing)
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#
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# By default, IRB prints (echoes) the values returned by all input commands.
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#
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# You can change the initial behavior and suppress all echoing by:
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#
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# * Adding to the configuration file: `IRB.conf[:ECHO] = false`. (The default
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# value for this entry is `nil`, which means the same as `true`.)
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# * Giving command-line option `--noecho`. (The default is `--echo`.)
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#
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#
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# During the session, you can change the current setting with configuration
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# method `conf.echo=` (set to `true` or `false`).
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#
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# As stated above, by default IRB prints the values returned by all input
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# commands; but IRB offers special treatment for values returned by assignment
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# statements, which may be:
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#
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# * Printed with truncation (to fit on a single line of output), which is the
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# default; an ellipsis (`...` is suffixed, to indicate the truncation):
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#
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# irb(main):001> x = 'abc' * 100
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#
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#
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# > "abcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabc...
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#
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# * Printed in full (regardless of the length).
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# * Suppressed (not printed at all)
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#
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#
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# You can change the initial behavior by:
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#
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# * Adding to the configuration file: `IRB.conf[:ECHO_ON_ASSIGNMENT] = false`.
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# (The default value for this entry is `niL`, which means the same as
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# `:truncate`.)
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# * Giving command-line option `--noecho-on-assignment` or
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# `--echo-on-assignment`. (The default is `--truncate-echo-on-assignment`.)
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#
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#
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# During the session, you can change the current setting with configuration
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# method `conf.echo_on_assignment=` (set to `true`, `false`, or `:truncate`).
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#
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# By default, IRB formats returned values by calling method `inspect`.
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#
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# You can change the initial behavior by:
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#
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# * Adding to the configuration file: `IRB.conf[:INSPECT_MODE] = false`. (The
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# default value for this entry is `true`.)
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# * Giving command-line option `--noinspect`. (The default is `--inspect`.)
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#
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#
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# During the session, you can change the setting using method
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# `conf.inspect_mode=`.
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#
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# ### Multiline Output
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#
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# By default, IRB prefixes a newline to a multiline response.
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#
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# You can change the initial default value by adding to the configuration file:
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#
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# IRB.conf[:NEWLINE_BEFORE_MULTILINE_OUTPUT] = false
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#
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# During a session, you can retrieve or set the value using methods
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# `conf.newline_before_multiline_output?` and
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# `conf.newline_before_multiline_output=`.
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#
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# Examples:
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#
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# irb(main):001> conf.inspect_mode = false
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# => false
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# irb(main):002> "foo\nbar"
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# =>
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# foo
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# bar
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# irb(main):003> conf.newline_before_multiline_output = false
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# => false
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# irb(main):004> "foo\nbar"
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# => foo
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# bar
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#
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# ### Evaluation History
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#
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# By default, IRB saves no history of evaluations (returned values), and the
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# related methods `conf.eval_history`, `_`, and `__` are undefined.
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#
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# You can turn on that history, and set the maximum number of evaluations to be
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# stored:
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#
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# * In the configuration file: add `IRB.conf[:EVAL_HISTORY] = *n*`. (Examples
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# below assume that we've added `IRB.conf[:EVAL_HISTORY] = 5`.)
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# * In the session (at any time): `conf.eval_history = *n*`.
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#
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#
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# If `n` is zero, all evaluation history is stored.
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#
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# Doing either of the above:
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#
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# * Sets the maximum size of the evaluation history; defines method
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# `conf.eval_history`, which returns the maximum size `n` of the evaluation
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# history:
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#
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# irb(main):001> conf.eval_history = 5
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# => 5
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# irb(main):002> conf.eval_history
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# => 5
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#
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# * Defines variable `_`, which contains the most recent evaluation, or `nil`
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# if none; same as method `conf.last_value`:
|
|
#
|
|
# irb(main):003> _
|
|
# => 5
|
|
# irb(main):004> :foo
|
|
# => :foo
|
|
# irb(main):005> :bar
|
|
# => :bar
|
|
# irb(main):006> _
|
|
# => :bar
|
|
# irb(main):007> _
|
|
# => :bar
|
|
#
|
|
# * Defines variable `__`:
|
|
#
|
|
# * `__` unadorned: contains all evaluation history:
|
|
#
|
|
# irb(main):008> :foo
|
|
# => :foo
|
|
# irb(main):009> :bar
|
|
# => :bar
|
|
# irb(main):010> :baz
|
|
# => :baz
|
|
# irb(main):011> :bat
|
|
# => :bat
|
|
# irb(main):012> :bam
|
|
# => :bam
|
|
# irb(main):013> __
|
|
# =>
|
|
# 9 :bar
|
|
# 10 :baz
|
|
# 11 :bat
|
|
# 12 :bam
|
|
# irb(main):014> __
|
|
# =>
|
|
# 10 :baz
|
|
# 11 :bat
|
|
# 12 :bam
|
|
# 13 ...self-history...
|
|
#
|
|
# Note that when the evaluation is multiline, it is displayed
|
|
# differently.
|
|
#
|
|
# * `__[`*m*`]`:
|
|
#
|
|
# * Positive *m*: contains the evaluation for the given line number,
|
|
# or `nil` if that line number is not in the evaluation history:
|
|
#
|
|
# irb(main):015> __[12]
|
|
# => :bam
|
|
# irb(main):016> __[1]
|
|
# => nil
|
|
#
|
|
# * Negative *m*: contains the `mth`-from-end evaluation, or `nil` if
|
|
# that evaluation is not in the evaluation history:
|
|
#
|
|
# irb(main):017> __[-3]
|
|
# => :bam
|
|
# irb(main):018> __[-13]
|
|
# => nil
|
|
#
|
|
# * Zero *m*: contains `nil`:
|
|
#
|
|
# irb(main):019> __[0]
|
|
# => nil
|
|
#
|
|
#
|
|
#
|
|
#
|
|
# ### Prompt and Return Formats
|
|
#
|
|
# By default, IRB uses the prompt and return value formats defined in its
|
|
# `:DEFAULT` prompt mode.
|
|
#
|
|
# #### The Default Prompt and Return Format
|
|
#
|
|
# The default prompt and return values look like this:
|
|
#
|
|
# irb(main):001> 1 + 1
|
|
# => 2
|
|
# irb(main):002> 2 + 2
|
|
# => 4
|
|
#
|
|
# The prompt includes:
|
|
#
|
|
# * The name of the running program (`irb`); see [IRB
|
|
# Name](rdoc-ref:IRB@IRB+Name).
|
|
# * The name of the current session (`main`); See [IRB
|
|
# Sessions](rdoc-ref:IRB@IRB+Sessions).
|
|
# * A 3-digit line number (1-based).
|
|
#
|
|
#
|
|
# The default prompt actually defines three formats:
|
|
#
|
|
# * One for most situations (as above):
|
|
#
|
|
# irb(main):003> Dir
|
|
# => Dir
|
|
#
|
|
# * One for when the typed command is a statement continuation (adds trailing
|
|
# asterisk):
|
|
#
|
|
# irb(main):004* Dir.
|
|
#
|
|
# * One for when the typed command is a string continuation (adds trailing
|
|
# single-quote):
|
|
#
|
|
# irb(main):005' Dir.entries('.
|
|
#
|
|
#
|
|
# You can see the prompt change as you type the characters in the following:
|
|
#
|
|
# irb(main):001* Dir.entries('.').select do |entry|
|
|
# irb(main):002* entry.start_with?('R')
|
|
# irb(main):003> end
|
|
# => ["README.md", "Rakefile"]
|
|
#
|
|
# #### Pre-Defined Prompts
|
|
#
|
|
# IRB has several pre-defined prompts, stored in hash `IRB.conf[:PROMPT]`:
|
|
#
|
|
# irb(main):001> IRB.conf[:PROMPT].keys
|
|
# => [:NULL, :DEFAULT, :CLASSIC, :SIMPLE, :INF_RUBY, :XMP]
|
|
#
|
|
# To see the full data for these, type `IRB.conf[:PROMPT]`.
|
|
#
|
|
# Most of these prompt definitions include specifiers that represent values like
|
|
# the IRB name, session name, and line number; see [Prompt
|
|
# Specifiers](rdoc-ref:IRB@Prompt+Specifiers).
|
|
#
|
|
# You can change the initial prompt and return format by:
|
|
#
|
|
# * Adding to the configuration file: `IRB.conf[:PROMPT] = *mode*` where
|
|
# *mode* is the symbol name of a prompt mode.
|
|
# * Giving a command-line option:
|
|
#
|
|
# * `--prompt *mode*`: sets the prompt mode to *mode*. where *mode* is the
|
|
# symbol name of a prompt mode.
|
|
# * `--simple-prompt` or `--sample-book-mode`: sets the prompt mode to
|
|
# `:SIMPLE`.
|
|
# * `--inf-ruby-mode`: sets the prompt mode to `:INF_RUBY` and suppresses
|
|
# both `--multiline` and `--singleline`.
|
|
# * `--noprompt`: suppresses prompting; does not affect echoing.
|
|
#
|
|
#
|
|
#
|
|
# You can retrieve or set the current prompt mode with methods
|
|
#
|
|
# `conf.prompt_mode` and `conf.prompt_mode=`.
|
|
#
|
|
# If you're interested in prompts and return formats other than the defaults,
|
|
# you might experiment by trying some of the others.
|
|
#
|
|
# #### Custom Prompts
|
|
#
|
|
# You can also define custom prompts and return formats, which may be done
|
|
# either in an IRB session or in the configuration file.
|
|
#
|
|
# A prompt in IRB actually defines three prompts, as seen above. For simple
|
|
# custom data, we'll make all three the same:
|
|
#
|
|
# irb(main):001* IRB.conf[:PROMPT][:MY_PROMPT] = {
|
|
# irb(main):002* PROMPT_I: ': ',
|
|
# irb(main):003* PROMPT_C: ': ',
|
|
# irb(main):004* PROMPT_S: ': ',
|
|
# irb(main):005* RETURN: '=> '
|
|
# irb(main):006> }
|
|
# => {:PROMPT_I=>": ", :PROMPT_C=>": ", :PROMPT_S=>": ", :RETURN=>"=> "}
|
|
#
|
|
# If you define the custom prompt in the configuration file, you can also make
|
|
# it the current prompt by adding:
|
|
#
|
|
# IRB.conf[:PROMPT_MODE] = :MY_PROMPT
|
|
#
|
|
# Regardless of where it's defined, you can make it the current prompt in a
|
|
# session:
|
|
#
|
|
# conf.prompt_mode = :MY_PROMPT
|
|
#
|
|
# You can view or modify the current prompt data with various configuration
|
|
# methods:
|
|
#
|
|
# * `conf.prompt_mode`, `conf.prompt_mode=`.
|
|
# * `conf.prompt_c`, `conf.c=`.
|
|
# * `conf.prompt_i`, `conf.i=`.
|
|
# * `conf.prompt_s`, `conf.s=`.
|
|
# * `conf.return_format`, `return_format=`.
|
|
#
|
|
#
|
|
# #### Prompt Specifiers
|
|
#
|
|
# A prompt's definition can include specifiers for which certain values are
|
|
# substituted:
|
|
#
|
|
# * `%N`: the name of the running program.
|
|
# * `%m`: the value of `self.to_s`.
|
|
# * `%M`: the value of `self.inspect`.
|
|
# * `%l`: an indication of the type of string; one of `"`, `'`, `/`, `]`.
|
|
# * `%NNi`: Indentation level. NN is a 2-digit number that specifies the number
|
|
# of digits of the indentation level (03 will result in 001).
|
|
# * `%NNn`: Line number. NN is a 2-digit number that specifies the number
|
|
# of digits of the line number (03 will result in 001).
|
|
# * `%%`: Literal `%`.
|
|
#
|
|
#
|
|
# ### Verbosity
|
|
#
|
|
# By default, IRB verbosity is disabled, which means that output is smaller
|
|
# rather than larger.
|
|
#
|
|
# You can enable verbosity by:
|
|
#
|
|
# * Adding to the configuration file: `IRB.conf[:VERBOSE] = true` (the default
|
|
# is `nil`).
|
|
# * Giving command-line options `--verbose` (the default is `--noverbose`).
|
|
#
|
|
#
|
|
# During a session, you can retrieve or set verbosity with methods
|
|
# `conf.verbose` and `conf.verbose=`.
|
|
#
|
|
# ### Help
|
|
#
|
|
# Command-line option `--version` causes IRB to print its help text and exit.
|
|
#
|
|
# ### Version
|
|
#
|
|
# Command-line option `--version` causes IRB to print its version text and exit.
|
|
#
|
|
# ## Input and Output
|
|
#
|
|
# ### Color Highlighting
|
|
#
|
|
# By default, IRB color highlighting is enabled, and is used for both:
|
|
#
|
|
# * Input: As you type, IRB reads the typed characters and highlights elements
|
|
# that it recognizes; it also highlights errors such as mismatched
|
|
# parentheses.
|
|
# * Output: IRB highlights syntactical elements.
|
|
#
|
|
#
|
|
# You can disable color highlighting by:
|
|
#
|
|
# * Adding to the configuration file: `IRB.conf[:USE_COLORIZE] = false` (the
|
|
# default value is `true`).
|
|
# * Giving command-line option `--nocolorize`
|
|
#
|
|
#
|
|
# ## Debugging
|
|
#
|
|
# Command-line option `-d` sets variables `$VERBOSE` and `$DEBUG` to `true`;
|
|
# these have no effect on IRB output.
|
|
#
|
|
# ### Warnings
|
|
#
|
|
# Command-line option `-w` suppresses warnings.
|
|
#
|
|
# Command-line option `-W[*level*]` sets warning level;
|
|
#
|
|
# * 0=silence
|
|
# * 1=medium
|
|
# * 2=verbose
|
|
#
|
|
# ## Other Features
|
|
#
|
|
# ### Load Modules
|
|
#
|
|
# You can specify the names of modules that are to be required at startup.
|
|
#
|
|
# Array `conf.load_modules` determines the modules (if any) that are to be
|
|
# required during session startup. The array is used only during session
|
|
# startup, so the initial value is the only one that counts.
|
|
#
|
|
# The default initial value is `[]` (load no modules):
|
|
#
|
|
# irb(main):001> conf.load_modules
|
|
# => []
|
|
#
|
|
# You can set the default initial value via:
|
|
#
|
|
# * Command-line option `-r`
|
|
#
|
|
# $ irb -r csv -r json
|
|
# irb(main):001> conf.load_modules
|
|
# => ["csv", "json"]
|
|
#
|
|
# * Hash entry `IRB.conf[:LOAD_MODULES] = *array*`:
|
|
#
|
|
# IRB.conf[:LOAD_MODULES] = %w[csv, json]
|
|
#
|
|
#
|
|
# Note that the configuration file entry overrides the command-line options.
|
|
#
|
|
# ### RI Documentation Directories
|
|
#
|
|
# You can specify the paths to RI documentation directories that are to be
|
|
# loaded (in addition to the default directories) at startup; see details about
|
|
# RI by typing `ri --help`.
|
|
#
|
|
# Array `conf.extra_doc_dirs` determines the directories (if any) that are to be
|
|
# loaded during session startup. The array is used only during session startup,
|
|
# so the initial value is the only one that counts.
|
|
#
|
|
# The default initial value is `[]` (load no extra documentation):
|
|
#
|
|
# irb(main):001> conf.extra_doc_dirs
|
|
# => []
|
|
#
|
|
# You can set the default initial value via:
|
|
#
|
|
# * Command-line option `--extra_doc_dir`
|
|
#
|
|
# $ irb --extra-doc-dir your_doc_dir --extra-doc-dir my_doc_dir
|
|
# irb(main):001> conf.extra_doc_dirs
|
|
# => ["your_doc_dir", "my_doc_dir"]
|
|
#
|
|
# * Hash entry `IRB.conf[:EXTRA_DOC_DIRS] = *array*`:
|
|
#
|
|
# IRB.conf[:EXTRA_DOC_DIRS] = %w[your_doc_dir my_doc_dir]
|
|
#
|
|
#
|
|
# Note that the configuration file entry overrides the command-line options.
|
|
#
|
|
# ### IRB Name
|
|
#
|
|
# You can specify a name for IRB.
|
|
#
|
|
# The default initial value is `'irb'`:
|
|
#
|
|
# irb(main):001> conf.irb_name
|
|
# => "irb"
|
|
#
|
|
# You can set the default initial value via hash entry `IRB.conf[:IRB_NAME] =
|
|
# *string*`:
|
|
#
|
|
# IRB.conf[:IRB_NAME] = 'foo'
|
|
#
|
|
# ### Application Name
|
|
#
|
|
# You can specify an application name for the IRB session.
|
|
#
|
|
# The default initial value is `'irb'`:
|
|
#
|
|
# irb(main):001> conf.ap_name
|
|
# => "irb"
|
|
#
|
|
# You can set the default initial value via hash entry `IRB.conf[:AP_NAME] =
|
|
# *string*`:
|
|
#
|
|
# IRB.conf[:AP_NAME] = 'my_ap_name'
|
|
#
|
|
# ### Configuration Monitor
|
|
#
|
|
# You can monitor changes to the configuration by assigning a proc to
|
|
# `IRB.conf[:IRB_RC]` in the configuration file:
|
|
#
|
|
# IRB.conf[:IRB_RC] = proc {|conf| puts conf.class }
|
|
#
|
|
# Each time the configuration is changed, that proc is called with argument
|
|
# `conf`:
|
|
#
|
|
# ### Encodings
|
|
#
|
|
# Command-line option `-E *ex*[:*in*]` sets initial external (ex) and internal
|
|
# (in) encodings.
|
|
#
|
|
# Command-line option `-U` sets both to UTF-8.
|
|
#
|
|
# ### Commands
|
|
#
|
|
# Please use the `help` command to see the list of available commands.
|
|
#
|
|
# ### IRB Sessions
|
|
#
|
|
# IRB has a special feature, that allows you to manage many sessions at once.
|
|
#
|
|
# You can create new sessions with Irb.irb, and get a list of current sessions
|
|
# with the `jobs` command in the prompt.
|
|
#
|
|
# #### Configuration
|
|
#
|
|
# The command line options, or IRB.conf, specify the default behavior of
|
|
# Irb.irb.
|
|
#
|
|
# On the other hand, each conf in IRB@Command-Line+Options is used to
|
|
# individually configure IRB.irb.
|
|
#
|
|
# If a proc is set for `IRB.conf[:IRB_RC]`, its will be invoked after execution
|
|
# of that proc with the context of the current session as its argument. Each
|
|
# session can be configured using this mechanism.
|
|
#
|
|
# #### Session variables
|
|
#
|
|
# There are a few variables in every Irb session that can come in handy:
|
|
#
|
|
# `_`
|
|
# : The value command executed, as a local variable
|
|
# `__`
|
|
# : The history of evaluated commands. Available only if
|
|
# `IRB.conf[:EVAL_HISTORY]` is not `nil` (which is the default). See also
|
|
# IRB::Context#eval_history= and IRB::History.
|
|
# `__[line_no]`
|
|
# : Returns the evaluation value at the given line number, `line_no`. If
|
|
# `line_no` is a negative, the return value `line_no` many lines before the
|
|
# most recent return value.
|
|
#
|
|
#
|
|
# ## Restrictions
|
|
#
|
|
# Ruby code typed into IRB behaves the same as Ruby code in a file, except that:
|
|
#
|
|
# * Because IRB evaluates input immediately after it is syntactically
|
|
# complete, some results may be slightly different.
|
|
# * Forking may not be well behaved.
|
|
#
|
|
module IRB
|
|
|
|
# An exception raised by IRB.irb_abort
|
|
class Abort < Exception;end
|
|
|
|
class << self
|
|
# The current IRB::Context of the session, see IRB.conf
|
|
#
|
|
# irb
|
|
# irb(main):001:0> IRB.CurrentContext.irb_name = "foo"
|
|
# foo(main):002:0> IRB.conf[:MAIN_CONTEXT].irb_name #=> "foo"
|
|
def CurrentContext # :nodoc:
|
|
conf[:MAIN_CONTEXT]
|
|
end
|
|
|
|
# Initializes IRB and creates a new Irb.irb object at the `TOPLEVEL_BINDING`
|
|
def start(ap_path = nil)
|
|
STDOUT.sync = true
|
|
$0 = File::basename(ap_path, ".rb") if ap_path
|
|
|
|
setup(ap_path)
|
|
|
|
if @CONF[:SCRIPT]
|
|
irb = Irb.new(nil, @CONF[:SCRIPT])
|
|
else
|
|
irb = Irb.new
|
|
end
|
|
irb.run(@CONF)
|
|
end
|
|
|
|
# Quits irb
|
|
def irb_exit(*) # :nodoc:
|
|
throw :IRB_EXIT, false
|
|
end
|
|
|
|
# Aborts then interrupts irb.
|
|
#
|
|
# Will raise an Abort exception, or the given `exception`.
|
|
def irb_abort(irb, exception = Abort) # :nodoc:
|
|
irb.context.thread.raise exception, "abort then interrupt!"
|
|
end
|
|
end
|
|
|
|
class Irb
|
|
# Note: instance and index assignment expressions could also be written like:
|
|
# "foo.bar=(1)" and "foo.[]=(1, bar)", when expressed that way, the former be
|
|
# parsed as :assign and echo will be suppressed, but the latter is parsed as a
|
|
# :method_add_arg and the output won't be suppressed
|
|
|
|
PROMPT_MAIN_TRUNCATE_LENGTH = 32
|
|
PROMPT_MAIN_TRUNCATE_OMISSION = '...'
|
|
CONTROL_CHARACTERS_PATTERN = "\x00-\x1F"
|
|
|
|
# Returns the current context of this irb session
|
|
attr_reader :context
|
|
# The lexer used by this irb session
|
|
attr_accessor :scanner
|
|
|
|
attr_reader :from_binding
|
|
|
|
# Creates a new irb session
|
|
def initialize(workspace = nil, input_method = nil, from_binding: false)
|
|
@from_binding = from_binding
|
|
@context = Context.new(self, workspace, input_method)
|
|
@context.workspace.load_helper_methods_to_main
|
|
@signal_status = :IN_IRB
|
|
@scanner = RubyLex.new
|
|
@line_no = 1
|
|
end
|
|
|
|
# A hook point for `debug` command's breakpoint after :IRB_EXIT as well as its
|
|
# clean-up
|
|
def debug_break
|
|
# it means the debug integration has been activated
|
|
if defined?(DEBUGGER__) && DEBUGGER__.respond_to?(:capture_frames_without_irb)
|
|
# after leaving this initial breakpoint, revert the capture_frames patch
|
|
DEBUGGER__.singleton_class.send(:alias_method, :capture_frames, :capture_frames_without_irb)
|
|
# and remove the redundant method
|
|
DEBUGGER__.singleton_class.send(:undef_method, :capture_frames_without_irb)
|
|
end
|
|
end
|
|
|
|
def debug_readline(binding)
|
|
workspace = IRB::WorkSpace.new(binding)
|
|
context.replace_workspace(workspace)
|
|
context.workspace.load_helper_methods_to_main
|
|
@line_no += 1
|
|
|
|
# When users run:
|
|
# 1. Debugging commands, like `step 2`
|
|
# 2. Any input that's not irb-command, like `foo = 123`
|
|
#
|
|
#
|
|
# Irb#eval_input will simply return the input, and we need to pass it to the
|
|
# debugger.
|
|
input = nil
|
|
forced_exit = catch(:IRB_EXIT) do
|
|
if History.save_history? && context.io.support_history_saving?
|
|
# Previous IRB session's history has been saved when `Irb#run` is exited We need
|
|
# to make sure the saved history is not saved again by resetting the counter
|
|
context.io.reset_history_counter
|
|
|
|
begin
|
|
input = eval_input
|
|
ensure
|
|
context.io.save_history
|
|
end
|
|
else
|
|
input = eval_input
|
|
end
|
|
false
|
|
end
|
|
|
|
Kernel.exit if forced_exit
|
|
|
|
if input&.include?("\n")
|
|
@line_no += input.count("\n") - 1
|
|
end
|
|
|
|
input
|
|
end
|
|
|
|
def run(conf = IRB.conf)
|
|
in_nested_session = !!conf[:MAIN_CONTEXT]
|
|
conf[:IRB_RC].call(context) if conf[:IRB_RC]
|
|
prev_context = conf[:MAIN_CONTEXT]
|
|
conf[:MAIN_CONTEXT] = context
|
|
|
|
load_history = !in_nested_session && context.io.support_history_saving?
|
|
save_history = load_history && History.save_history?
|
|
|
|
if load_history
|
|
context.io.load_history
|
|
end
|
|
|
|
prev_trap = trap("SIGINT") do
|
|
signal_handle
|
|
end
|
|
|
|
begin
|
|
if defined?(RubyVM.keep_script_lines)
|
|
keep_script_lines_backup = RubyVM.keep_script_lines
|
|
RubyVM.keep_script_lines = true
|
|
end
|
|
|
|
forced_exit = catch(:IRB_EXIT) do
|
|
eval_input
|
|
end
|
|
ensure
|
|
# Do not restore to nil. It will cause IRB crash when used with threads.
|
|
IRB.conf[:MAIN_CONTEXT] = prev_context if prev_context
|
|
|
|
RubyVM.keep_script_lines = keep_script_lines_backup if defined?(RubyVM.keep_script_lines)
|
|
trap("SIGINT", prev_trap)
|
|
conf[:AT_EXIT].each{|hook| hook.call}
|
|
|
|
context.io.save_history if save_history
|
|
Kernel.exit if forced_exit
|
|
end
|
|
end
|
|
|
|
# Evaluates input for this session.
|
|
def eval_input
|
|
configure_io
|
|
|
|
each_top_level_statement do |statement, line_no|
|
|
signal_status(:IN_EVAL) do
|
|
begin
|
|
# If the integration with debugger is activated, we return certain input if it
|
|
# should be dealt with by debugger
|
|
if @context.with_debugger && statement.should_be_handled_by_debugger?
|
|
return statement.code
|
|
end
|
|
|
|
@context.evaluate(statement, line_no)
|
|
|
|
if @context.echo? && !statement.suppresses_echo?
|
|
if statement.is_assignment?
|
|
if @context.echo_on_assignment?
|
|
output_value(@context.echo_on_assignment? == :truncate)
|
|
end
|
|
else
|
|
output_value
|
|
end
|
|
end
|
|
rescue SystemExit, SignalException
|
|
raise
|
|
rescue Interrupt, Exception => exc
|
|
handle_exception(exc)
|
|
@context.workspace.local_variable_set(:_, exc)
|
|
end
|
|
end
|
|
end
|
|
end
|
|
|
|
def read_input(prompt)
|
|
signal_status(:IN_INPUT) do
|
|
@context.io.prompt = prompt
|
|
if l = @context.io.gets
|
|
print l if @context.verbose?
|
|
else
|
|
if @context.ignore_eof? and @context.io.readable_after_eof?
|
|
l = "\n"
|
|
if @context.verbose?
|
|
printf "Use \"exit\" to leave %s\n", @context.ap_name
|
|
end
|
|
else
|
|
print "\n" if @context.prompting?
|
|
end
|
|
end
|
|
l
|
|
end
|
|
end
|
|
|
|
def readmultiline
|
|
prompt = generate_prompt([], false, 0)
|
|
|
|
# multiline
|
|
return read_input(prompt) if @context.io.respond_to?(:check_termination)
|
|
|
|
# nomultiline
|
|
code = +''
|
|
line_offset = 0
|
|
loop do
|
|
line = read_input(prompt)
|
|
unless line
|
|
return code.empty? ? nil : code
|
|
end
|
|
|
|
code << line
|
|
return code if command?(code)
|
|
|
|
tokens, opens, terminated = @scanner.check_code_state(code, local_variables: @context.local_variables)
|
|
return code if terminated
|
|
|
|
line_offset += 1
|
|
continue = @scanner.should_continue?(tokens)
|
|
prompt = generate_prompt(opens, continue, line_offset)
|
|
end
|
|
end
|
|
|
|
def each_top_level_statement
|
|
loop do
|
|
code = readmultiline
|
|
break unless code
|
|
yield build_statement(code), @line_no
|
|
@line_no += code.count("\n")
|
|
rescue RubyLex::TerminateLineInput
|
|
end
|
|
end
|
|
|
|
def build_statement(code)
|
|
if code.match?(/\A\n*\z/)
|
|
return Statement::EmptyInput.new
|
|
end
|
|
|
|
code = code.dup.force_encoding(@context.io.encoding)
|
|
if (command, arg = @context.parse_command(code))
|
|
command_class = Command.load_command(command)
|
|
Statement::Command.new(code, command_class, arg)
|
|
else
|
|
is_assignment_expression = @scanner.assignment_expression?(code, local_variables: @context.local_variables)
|
|
Statement::Expression.new(code, is_assignment_expression)
|
|
end
|
|
end
|
|
|
|
def command?(code)
|
|
!!@context.parse_command(code)
|
|
end
|
|
|
|
def configure_io
|
|
if @context.io.respond_to?(:check_termination)
|
|
@context.io.check_termination do |code|
|
|
if Reline::IOGate.in_pasting?
|
|
rest = @scanner.check_termination_in_prev_line(code, local_variables: @context.local_variables)
|
|
if rest
|
|
Reline.delete_text
|
|
rest.bytes.reverse_each do |c|
|
|
Reline.ungetc(c)
|
|
end
|
|
true
|
|
else
|
|
false
|
|
end
|
|
else
|
|
next true if command?(code)
|
|
|
|
_tokens, _opens, terminated = @scanner.check_code_state(code, local_variables: @context.local_variables)
|
|
terminated
|
|
end
|
|
end
|
|
end
|
|
if @context.io.respond_to?(:dynamic_prompt)
|
|
@context.io.dynamic_prompt do |lines|
|
|
tokens = RubyLex.ripper_lex_without_warning(lines.map{ |l| l + "\n" }.join, local_variables: @context.local_variables)
|
|
line_results = IRB::NestingParser.parse_by_line(tokens)
|
|
tokens_until_line = []
|
|
line_results.map.with_index do |(line_tokens, _prev_opens, next_opens, _min_depth), line_num_offset|
|
|
line_tokens.each do |token, _s|
|
|
# Avoid appending duplicated token. Tokens that include "n" like multiline
|
|
# tstring_content can exist in multiple lines.
|
|
tokens_until_line << token if token != tokens_until_line.last
|
|
end
|
|
continue = @scanner.should_continue?(tokens_until_line)
|
|
generate_prompt(next_opens, continue, line_num_offset)
|
|
end
|
|
end
|
|
end
|
|
|
|
if @context.io.respond_to?(:auto_indent) and @context.auto_indent_mode
|
|
@context.io.auto_indent do |lines, line_index, byte_pointer, is_newline|
|
|
next nil if lines == [nil] # Workaround for exit IRB with CTRL+d
|
|
next nil if !is_newline && lines[line_index]&.byteslice(0, byte_pointer)&.match?(/\A\s*\z/)
|
|
|
|
code = lines[0..line_index].map { |l| "#{l}\n" }.join
|
|
tokens = RubyLex.ripper_lex_without_warning(code, local_variables: @context.local_variables)
|
|
@scanner.process_indent_level(tokens, lines, line_index, is_newline)
|
|
end
|
|
end
|
|
end
|
|
|
|
def convert_invalid_byte_sequence(str, enc)
|
|
str.force_encoding(enc)
|
|
str.scrub { |c|
|
|
c.bytes.map{ |b| "\\x#{b.to_s(16).upcase}" }.join
|
|
}
|
|
end
|
|
|
|
def encode_with_invalid_byte_sequence(str, enc)
|
|
conv = Encoding::Converter.new(str.encoding, enc)
|
|
dst = String.new
|
|
begin
|
|
ret = conv.primitive_convert(str, dst)
|
|
case ret
|
|
when :invalid_byte_sequence
|
|
conv.insert_output(conv.primitive_errinfo[3].dump[1..-2])
|
|
redo
|
|
when :undefined_conversion
|
|
c = conv.primitive_errinfo[3].dup.force_encoding(conv.primitive_errinfo[1])
|
|
conv.insert_output(c.dump[1..-2])
|
|
redo
|
|
when :incomplete_input
|
|
conv.insert_output(conv.primitive_errinfo[3].dump[1..-2])
|
|
when :finished
|
|
end
|
|
break
|
|
end while nil
|
|
dst
|
|
end
|
|
|
|
def handle_exception(exc)
|
|
if exc.backtrace[0] =~ /\/irb(2)?(\/.*|-.*|\.rb)?:/ && exc.class.to_s !~ /^IRB/ &&
|
|
!(SyntaxError === exc) && !(EncodingError === exc)
|
|
# The backtrace of invalid encoding hash (ex. {"\xAE": 1}) raises EncodingError without lineno.
|
|
irb_bug = true
|
|
else
|
|
irb_bug = false
|
|
# To support backtrace filtering while utilizing Exception#full_message, we need to clone
|
|
# the exception to avoid modifying the original exception's backtrace.
|
|
exc = exc.clone
|
|
filtered_backtrace = exc.backtrace.map { |l| @context.workspace.filter_backtrace(l) }.compact
|
|
backtrace_filter = IRB.conf[:BACKTRACE_FILTER]
|
|
|
|
if backtrace_filter
|
|
if backtrace_filter.respond_to?(:call)
|
|
filtered_backtrace = backtrace_filter.call(filtered_backtrace)
|
|
else
|
|
warn "IRB.conf[:BACKTRACE_FILTER] #{backtrace_filter} should respond to `call` method"
|
|
end
|
|
end
|
|
|
|
exc.set_backtrace(filtered_backtrace)
|
|
end
|
|
|
|
highlight = Color.colorable?
|
|
|
|
order =
|
|
if RUBY_VERSION < '3.0.0'
|
|
STDOUT.tty? ? :bottom : :top
|
|
else # '3.0.0' <= RUBY_VERSION
|
|
:top
|
|
end
|
|
|
|
message = exc.full_message(order: order, highlight: highlight)
|
|
message = convert_invalid_byte_sequence(message, exc.message.encoding)
|
|
message = encode_with_invalid_byte_sequence(message, IRB.conf[:LC_MESSAGES].encoding) unless message.encoding.to_s.casecmp?(IRB.conf[:LC_MESSAGES].encoding.to_s)
|
|
message = message.gsub(/((?:^\t.+$\n)+)/) { |m|
|
|
case order
|
|
when :top
|
|
lines = m.split("\n")
|
|
when :bottom
|
|
lines = m.split("\n").reverse
|
|
end
|
|
unless irb_bug
|
|
if lines.size > @context.back_trace_limit
|
|
omit = lines.size - @context.back_trace_limit
|
|
lines = lines[0..(@context.back_trace_limit - 1)]
|
|
lines << "\t... %d levels..." % omit
|
|
end
|
|
end
|
|
lines = lines.reverse if order == :bottom
|
|
lines.map{ |l| l + "\n" }.join
|
|
}
|
|
# The "<top (required)>" in "(irb)" may be the top level of IRB so imitate the main object.
|
|
message = message.gsub(/\(irb\):(?<num>\d+):in (?<open_quote>[`'])<(?<frame>top \(required\))>'/) { "(irb):#{$~[:num]}:in #{$~[:open_quote]}<main>'" }
|
|
puts message
|
|
puts 'Maybe IRB bug!' if irb_bug
|
|
rescue Exception => handler_exc
|
|
begin
|
|
puts exc.inspect
|
|
puts "backtraces are hidden because #{handler_exc} was raised when processing them"
|
|
rescue Exception
|
|
puts 'Uninspectable exception occurred'
|
|
end
|
|
end
|
|
|
|
# Evaluates the given block using the given `path` as the Context#irb_path and
|
|
# `name` as the Context#irb_name.
|
|
#
|
|
# Used by the irb command `source`, see IRB@IRB+Sessions for more information.
|
|
def suspend_name(path = nil, name = nil)
|
|
@context.irb_path, back_path = path, @context.irb_path if path
|
|
@context.irb_name, back_name = name, @context.irb_name if name
|
|
begin
|
|
yield back_path, back_name
|
|
ensure
|
|
@context.irb_path = back_path if path
|
|
@context.irb_name = back_name if name
|
|
end
|
|
end
|
|
|
|
# Evaluates the given block using the given `workspace` as the
|
|
# Context#workspace.
|
|
#
|
|
# Used by the irb command `irb_load`, see IRB@IRB+Sessions for more information.
|
|
def suspend_workspace(workspace)
|
|
current_workspace = @context.workspace
|
|
@context.replace_workspace(workspace)
|
|
yield
|
|
ensure
|
|
@context.replace_workspace current_workspace
|
|
end
|
|
|
|
# Evaluates the given block using the given `input_method` as the Context#io.
|
|
#
|
|
# Used by the irb commands `source` and `irb_load`, see IRB@IRB+Sessions for
|
|
# more information.
|
|
def suspend_input_method(input_method)
|
|
back_io = @context.io
|
|
@context.instance_eval{@io = input_method}
|
|
begin
|
|
yield back_io
|
|
ensure
|
|
@context.instance_eval{@io = back_io}
|
|
end
|
|
end
|
|
|
|
# Handler for the signal SIGINT, see Kernel#trap for more information.
|
|
def signal_handle
|
|
unless @context.ignore_sigint?
|
|
print "\nabort!\n" if @context.verbose?
|
|
exit
|
|
end
|
|
|
|
case @signal_status
|
|
when :IN_INPUT
|
|
print "^C\n"
|
|
raise RubyLex::TerminateLineInput
|
|
when :IN_EVAL
|
|
IRB.irb_abort(self)
|
|
when :IN_LOAD
|
|
IRB.irb_abort(self, LoadAbort)
|
|
when :IN_IRB
|
|
# ignore
|
|
else
|
|
# ignore other cases as well
|
|
end
|
|
end
|
|
|
|
# Evaluates the given block using the given `status`.
|
|
def signal_status(status)
|
|
return yield if @signal_status == :IN_LOAD
|
|
|
|
signal_status_back = @signal_status
|
|
@signal_status = status
|
|
begin
|
|
yield
|
|
ensure
|
|
@signal_status = signal_status_back
|
|
end
|
|
end
|
|
|
|
def output_value(omit = false) # :nodoc:
|
|
str = @context.inspect_last_value
|
|
multiline_p = str.include?("\n")
|
|
if omit
|
|
winwidth = @context.io.winsize.last
|
|
if multiline_p
|
|
first_line = str.split("\n").first
|
|
result = @context.newline_before_multiline_output? ? (@context.return_format % first_line) : first_line
|
|
output_width = Reline::Unicode.calculate_width(result, true)
|
|
diff_size = output_width - Reline::Unicode.calculate_width(first_line, true)
|
|
if diff_size.positive? and output_width > winwidth
|
|
lines, _ = Reline::Unicode.split_by_width(first_line, winwidth - diff_size - 3)
|
|
str = "%s..." % lines.first
|
|
str += "\e[0m" if Color.colorable?
|
|
multiline_p = false
|
|
else
|
|
str = str.gsub(/(\A.*?\n).*/m, "\\1...")
|
|
str += "\e[0m" if Color.colorable?
|
|
end
|
|
else
|
|
output_width = Reline::Unicode.calculate_width(@context.return_format % str, true)
|
|
diff_size = output_width - Reline::Unicode.calculate_width(str, true)
|
|
if diff_size.positive? and output_width > winwidth
|
|
lines, _ = Reline::Unicode.split_by_width(str, winwidth - diff_size - 3)
|
|
str = "%s..." % lines.first
|
|
str += "\e[0m" if Color.colorable?
|
|
end
|
|
end
|
|
end
|
|
|
|
if multiline_p && @context.newline_before_multiline_output?
|
|
str = "\n" + str
|
|
end
|
|
|
|
Pager.page_content(format(@context.return_format, str), retain_content: true)
|
|
end
|
|
|
|
# Outputs the local variables to this current session, including #signal_status
|
|
# and #context, using IRB::Locale.
|
|
def inspect
|
|
ary = []
|
|
for iv in instance_variables
|
|
case (iv = iv.to_s)
|
|
when "@signal_status"
|
|
ary.push format("%s=:%s", iv, @signal_status.id2name)
|
|
when "@context"
|
|
ary.push format("%s=%s", iv, eval(iv).__to_s__)
|
|
else
|
|
ary.push format("%s=%s", iv, eval(iv))
|
|
end
|
|
end
|
|
format("#<%s: %s>", self.class, ary.join(", "))
|
|
end
|
|
|
|
private
|
|
|
|
def generate_prompt(opens, continue, line_offset)
|
|
ltype = @scanner.ltype_from_open_tokens(opens)
|
|
indent = @scanner.calc_indent_level(opens)
|
|
continue = opens.any? || continue
|
|
line_no = @line_no + line_offset
|
|
|
|
if ltype
|
|
f = @context.prompt_s
|
|
elsif continue
|
|
f = @context.prompt_c
|
|
else
|
|
f = @context.prompt_i
|
|
end
|
|
f = "" unless f
|
|
if @context.prompting?
|
|
p = format_prompt(f, ltype, indent, line_no)
|
|
else
|
|
p = ""
|
|
end
|
|
if @context.auto_indent_mode and !@context.io.respond_to?(:auto_indent)
|
|
unless ltype
|
|
prompt_i = @context.prompt_i.nil? ? "" : @context.prompt_i
|
|
ind = format_prompt(prompt_i, ltype, indent, line_no)[/.*\z/].size +
|
|
indent * 2 - p.size
|
|
p += " " * ind if ind > 0
|
|
end
|
|
end
|
|
p
|
|
end
|
|
|
|
def truncate_prompt_main(str) # :nodoc:
|
|
str = str.tr(CONTROL_CHARACTERS_PATTERN, ' ')
|
|
if str.size <= PROMPT_MAIN_TRUNCATE_LENGTH
|
|
str
|
|
else
|
|
str[0, PROMPT_MAIN_TRUNCATE_LENGTH - PROMPT_MAIN_TRUNCATE_OMISSION.size] + PROMPT_MAIN_TRUNCATE_OMISSION
|
|
end
|
|
end
|
|
|
|
def format_prompt(format, ltype, indent, line_no) # :nodoc:
|
|
format.gsub(/%([0-9]+)?([a-zA-Z%])/) do
|
|
case $2
|
|
when "N"
|
|
@context.irb_name
|
|
when "m"
|
|
main_str = @context.main.to_s rescue "!#{$!.class}"
|
|
truncate_prompt_main(main_str)
|
|
when "M"
|
|
main_str = @context.main.inspect rescue "!#{$!.class}"
|
|
truncate_prompt_main(main_str)
|
|
when "l"
|
|
ltype
|
|
when "i"
|
|
if indent < 0
|
|
if $1
|
|
"-".rjust($1.to_i)
|
|
else
|
|
"-"
|
|
end
|
|
else
|
|
if $1
|
|
format("%" + $1 + "d", indent)
|
|
else
|
|
indent.to_s
|
|
end
|
|
end
|
|
when "n"
|
|
if $1
|
|
format("%" + $1 + "d", line_no)
|
|
else
|
|
line_no.to_s
|
|
end
|
|
when "%"
|
|
"%" unless $1
|
|
end
|
|
end
|
|
end
|
|
end
|
|
end
|
|
|
|
class Binding
|
|
# Opens an IRB session where `binding.irb` is called which allows for
|
|
# interactive debugging. You can call any methods or variables available in the
|
|
# current scope, and mutate state if you need to.
|
|
#
|
|
# Given a Ruby file called `potato.rb` containing the following code:
|
|
#
|
|
# class Potato
|
|
# def initialize
|
|
# @cooked = false
|
|
# binding.irb
|
|
# puts "Cooked potato: #{@cooked}"
|
|
# end
|
|
# end
|
|
#
|
|
# Potato.new
|
|
#
|
|
# Running `ruby potato.rb` will open an IRB session where `binding.irb` is
|
|
# called, and you will see the following:
|
|
#
|
|
# $ ruby potato.rb
|
|
#
|
|
# From: potato.rb @ line 4 :
|
|
#
|
|
# 1: class Potato
|
|
# 2: def initialize
|
|
# 3: @cooked = false
|
|
# => 4: binding.irb
|
|
# 5: puts "Cooked potato: #{@cooked}"
|
|
# 6: end
|
|
# 7: end
|
|
# 8:
|
|
# 9: Potato.new
|
|
#
|
|
# irb(#<Potato:0x00007feea1916670>):001:0>
|
|
#
|
|
# You can type any valid Ruby code and it will be evaluated in the current
|
|
# context. This allows you to debug without having to run your code repeatedly:
|
|
#
|
|
# irb(#<Potato:0x00007feea1916670>):001:0> @cooked
|
|
# => false
|
|
# irb(#<Potato:0x00007feea1916670>):002:0> self.class
|
|
# => Potato
|
|
# irb(#<Potato:0x00007feea1916670>):003:0> caller.first
|
|
# => ".../2.5.1/lib/ruby/2.5.0/irb/workspace.rb:85:in `eval'"
|
|
# irb(#<Potato:0x00007feea1916670>):004:0> @cooked = true
|
|
# => true
|
|
#
|
|
# You can exit the IRB session with the `exit` command. Note that exiting will
|
|
# resume execution where `binding.irb` had paused it, as you can see from the
|
|
# output printed to standard output in this example:
|
|
#
|
|
# irb(#<Potato:0x00007feea1916670>):005:0> exit
|
|
# Cooked potato: true
|
|
#
|
|
# See IRB for more information.
|
|
def irb(show_code: true)
|
|
# Setup IRB with the current file's path and no command line arguments
|
|
IRB.setup(source_location[0], argv: []) unless IRB.initialized?
|
|
# Create a new workspace using the current binding
|
|
workspace = IRB::WorkSpace.new(self)
|
|
# Print the code around the binding if show_code is true
|
|
STDOUT.print(workspace.code_around_binding) if show_code
|
|
# Get the original IRB instance
|
|
debugger_irb = IRB.instance_variable_get(:@debugger_irb)
|
|
|
|
irb_path = File.expand_path(source_location[0])
|
|
|
|
if debugger_irb
|
|
# If we're already in a debugger session, set the workspace and irb_path for the original IRB instance
|
|
debugger_irb.context.replace_workspace(workspace)
|
|
debugger_irb.context.irb_path = irb_path
|
|
# If we've started a debugger session and hit another binding.irb, we don't want
|
|
# to start an IRB session instead, we want to resume the irb:rdbg session.
|
|
IRB::Debug.setup(debugger_irb)
|
|
IRB::Debug.insert_debug_break
|
|
debugger_irb.debug_break
|
|
else
|
|
# If we're not in a debugger session, create a new IRB instance with the current
|
|
# workspace
|
|
binding_irb = IRB::Irb.new(workspace, from_binding: true)
|
|
binding_irb.context.irb_path = irb_path
|
|
binding_irb.run(IRB.conf)
|
|
binding_irb.debug_break
|
|
end
|
|
end
|
|
end
|