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23a4ac6f0b
It makes a lot more sense to keep these procs under the `Pry::Prompt` namespace than `Pry`, which is already heavily populated by other various things.
689 lines
21 KiB
Ruby
689 lines
21 KiB
Ruby
# -*- coding: utf-8 -*-
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##
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# Pry is a powerful alternative to the standard IRB shell for Ruby. It
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# features syntax highlighting, a flexible plugin architecture, runtime
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# invocation and source and documentation browsing.
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#
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# Pry can be started similar to other command line utilities by simply running
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# the following command:
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#
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# pry
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#
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# Once inside Pry you can invoke the help message:
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#
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# help
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#
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# This will show a list of available commands and their usage. For more
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# information about Pry you can refer to the following resources:
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#
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# * http://pryrepl.org/
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# * https://github.com/pry/pry
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# * the IRC channel, which is #pry on the Freenode network
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#
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# rubocop:disable Metrics/ClassLength
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class Pry
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attr_accessor :binding_stack
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attr_accessor :custom_completions
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attr_accessor :eval_string
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attr_accessor :backtrace
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attr_accessor :suppress_output
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attr_accessor :last_result
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attr_accessor :last_file
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attr_accessor :last_dir
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attr_reader :last_exception
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attr_reader :command_state
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attr_reader :exit_value
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# @since v0.12.0
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attr_reader :input_ring
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# @since v0.12.0
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attr_reader :output_ring
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attr_reader :config
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extend Pry::Config::Convenience
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config_shortcut(*Pry::Config.shortcuts)
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EMPTY_COMPLETIONS = [].freeze
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# Create a new {Pry} instance.
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# @param [Hash] options
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# @option options [#readline] :input
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# The object to use for input.
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# @option options [#puts] :output
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# The object to use for output.
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# @option options [Pry::CommandBase] :commands
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# The object to use for commands.
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# @option options [Hash] :hooks
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# The defined hook Procs.
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# @option options [Array<Proc>] :prompt
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# The array of Procs to use for prompts.
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# @option options [Proc] :print
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# The Proc to use for printing return values.
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# @option options [Boolean] :quiet
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# Omit the `whereami` banner when starting.
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# @option options [Array<String>] :backtrace
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# The backtrace of the session's `binding.pry` line, if applicable.
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# @option options [Object] :target
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# The initial context for this session.
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def initialize(options={})
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@binding_stack = []
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@indent = Pry::Indent.new
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@command_state = {}
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@eval_string = ""
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@backtrace = options.delete(:backtrace) || caller
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target = options.delete(:target)
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@config = Pry::Config.new
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config.merge!(options)
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push_prompt(config.prompt)
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@input_ring = Pry::Ring.new(config.memory_size)
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@output_ring = Pry::Ring.new(config.memory_size)
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@custom_completions = config.command_completions
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set_last_result nil
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@input_ring << nil
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push_initial_binding(target)
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exec_hook(:when_started, target, options, self)
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end
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# @deprecated Use {#input_ring} instead.
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def input_array
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warn "[DEPRECATED] '#{self.class.name}##{__method__}' is deprecated. " \
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"Use '#{self.class.name}#input_ring' instead."
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@input_ring
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end
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# @deprecated Use {#output_ring} instead.
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def output_array
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warn "[DEPRECATED] '#{self.class.name}##{__method__}' is deprecated. " \
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"Use '#{self.class.name}#output_ring' instead"
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@output_ring
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end
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# The current prompt.
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# This is the prompt at the top of the prompt stack.
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#
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# @example
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# self.prompt = Pry::Prompt::SIMPLE
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# self.prompt # => Pry::Prompt::SIMPLE
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#
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# @return [Array<Proc>] Current prompt.
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def prompt
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prompt_stack.last
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end
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def prompt=(new_prompt)
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if prompt_stack.empty?
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push_prompt new_prompt
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else
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prompt_stack[-1] = new_prompt
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end
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end
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# Initialize this instance by pushing its initial context into the binding
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# stack. If no target is given, start at the top level.
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def push_initial_binding(target=nil)
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push_binding(target || Pry.toplevel_binding)
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end
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# The currently active `Binding`.
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# @return [Binding] The currently active `Binding` for the session.
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def current_binding
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binding_stack.last
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end
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alias current_context current_binding # support previous API
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# Push a binding for the given object onto the stack. If this instance is
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# currently stopped, mark it as usable again.
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def push_binding(object)
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@stopped = false
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binding_stack << Pry.binding_for(object)
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end
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#
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# Generate completions.
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#
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# @param [String] str
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# What the user has typed so far
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#
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# @return [Array<String>]
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# Possible completions
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#
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def complete(str)
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return EMPTY_COMPLETIONS unless config.completer
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Pry.critical_section do
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completer = config.completer.new(config.input, self)
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completer.call str, target: current_binding, custom_completions: custom_completions.call.push(*sticky_locals.keys)
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end
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end
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#
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# Injects a local variable into the provided binding.
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#
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# @param [String] name
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# The name of the local to inject.
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#
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# @param [Object] value
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# The value to set the local to.
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#
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# @param [Binding] b
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# The binding to set the local on.
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#
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# @return [Object]
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# The value the local was set to.
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#
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def inject_local(name, value, b)
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value = Proc === value ? value.call : value
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if b.respond_to?(:local_variable_set)
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b.local_variable_set name, value
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else # < 2.1
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begin
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Pry.current[:pry_local] = value
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b.eval "#{name} = ::Pry.current[:pry_local]"
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ensure
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Pry.current[:pry_local] = nil
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end
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end
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end
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undef :memory_size if method_defined? :memory_size
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# @return [Integer] The maximum amount of objects remembered by the inp and
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# out arrays. Defaults to 100.
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def memory_size
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@output_ring.max_size
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end
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undef :memory_size= if method_defined? :memory_size=
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def memory_size=(size)
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@input_ring = Pry::Ring.new(size)
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@output_ring = Pry::Ring.new(size)
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end
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# Inject all the sticky locals into the current binding.
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def inject_sticky_locals!
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sticky_locals.each_pair do |name, value|
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inject_local(name, value, current_binding)
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end
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end
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# Add a sticky local to this Pry instance.
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# A sticky local is a local that persists between all bindings in a session.
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# @param [Symbol] name The name of the sticky local.
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# @yield The block that defines the content of the local. The local
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# will be refreshed at each tick of the repl loop.
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def add_sticky_local(name, &block)
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config.extra_sticky_locals[name] = block
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end
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def sticky_locals
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{ _in_: input_ring,
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_out_: output_ring,
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_pry_: self,
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_ex_: last_exception && last_exception.wrapped_exception,
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_file_: last_file,
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_dir_: last_dir,
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_: proc { last_result },
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__: proc { output_ring[-2] }
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}.merge(config.extra_sticky_locals)
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end
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# Reset the current eval string. If the user has entered part of a multiline
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# expression, this discards that input.
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def reset_eval_string
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@eval_string = ""
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end
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# Pass a line of input to Pry.
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#
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# This is the equivalent of `Binding#eval` but with extra Pry!
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#
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# In particular:
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# 1. Pry commands will be executed immediately if the line matches.
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# 2. Partial lines of input will be queued up until a complete expression has
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# been accepted.
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# 3. Output is written to `#output` in pretty colours, not returned.
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#
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# Once this method has raised an exception or returned false, this instance
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# is no longer usable. {#exit_value} will return the session's breakout
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# value if applicable.
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#
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# @param [String?] line The line of input; `nil` if the user types `<Ctrl-D>`
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# @option options [Boolean] :generated Whether this line was generated automatically.
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# Generated lines are not stored in history.
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# @return [Boolean] Is Pry ready to accept more input?
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# @raise [Exception] If the user uses the `raise-up` command, this method
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# will raise that exception.
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def eval(line, options={})
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return false if @stopped
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exit_value = nil
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exception = catch(:raise_up) do
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exit_value = catch(:breakout) do
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handle_line(line, options)
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# We use 'return !@stopped' here instead of 'return true' so that if
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# handle_line has stopped this pry instance (e.g. by opening _pry_.repl and
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# then popping all the bindings) we still exit immediately.
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return !@stopped
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end
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exception = false
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end
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@stopped = true
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@exit_value = exit_value
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# TODO: make this configurable?
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raise exception if exception
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return false
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end
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def handle_line(line, options)
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if line.nil?
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config.control_d_handler.call(@eval_string, self)
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return
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end
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ensure_correct_encoding!(line)
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Pry.history << line unless options[:generated]
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@suppress_output = false
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inject_sticky_locals!
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begin
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if !process_command_safely(line)
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@eval_string << "#{line.chomp}\n" if !line.empty? || !@eval_string.empty?
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end
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rescue RescuableException => e
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self.last_exception = e
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result = e
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Pry.critical_section do
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show_result(result)
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end
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return
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end
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# This hook is supposed to be executed after each line of ruby code
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# has been read (regardless of whether eval_string is yet a complete expression)
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exec_hook :after_read, eval_string, self
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begin
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complete_expr = Pry::Code.complete_expression?(@eval_string)
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rescue SyntaxError => e
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output.puts "SyntaxError: #{e.message.sub(/.*syntax error, */m, '')}"
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reset_eval_string
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end
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if complete_expr
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if @eval_string =~ /;\Z/ || @eval_string.empty? || @eval_string =~ /\A *#.*\n\z/
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@suppress_output = true
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end
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# A bug in jruby makes java.lang.Exception not rescued by
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# `rescue Pry::RescuableException` clause.
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#
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# * https://github.com/pry/pry/issues/854
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# * https://jira.codehaus.org/browse/JRUBY-7100
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#
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# Until that gets fixed upstream, treat java.lang.Exception
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# as an additional exception to be rescued explicitly.
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#
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# This workaround has a side effect: java exceptions specified
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# in `Pry.config.exception_whitelist` are ignored.
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jruby_exceptions = []
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if Pry::Helpers::BaseHelpers.jruby?
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jruby_exceptions << Java::JavaLang::Exception
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end
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begin
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# Reset eval string, in case we're evaluating Ruby that does something
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# like open a nested REPL on this instance.
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eval_string = @eval_string
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reset_eval_string
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result = evaluate_ruby(eval_string)
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rescue RescuableException, *jruby_exceptions => e
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# Eliminate following warning:
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# warning: singleton on non-persistent Java type X
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# (http://wiki.jruby.org/Persistence)
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if Pry::Helpers::BaseHelpers.jruby? && e.class.respond_to?('__persistent__')
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e.class.__persistent__ = true
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end
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self.last_exception = e
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result = e
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end
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Pry.critical_section do
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show_result(result)
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end
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end
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throw(:breakout) if current_binding.nil?
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end
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private :handle_line
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# Potentially deprecated — Use `Pry::REPL.new(pry, :target => target).start`
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# (If nested sessions are going to exist, this method is fine, but a goal is
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# to come up with an alternative to nested sessions altogether.)
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def repl(target = nil)
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Pry::REPL.new(self, target: target).start
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end
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def evaluate_ruby(code)
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inject_sticky_locals!
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exec_hook :before_eval, code, self
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result = current_binding.eval(code, Pry.eval_path, Pry.current_line)
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set_last_result(result, code)
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ensure
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update_input_history(code)
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exec_hook :after_eval, result, self
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end
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# Output the result or pass to an exception handler (if result is an exception).
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def show_result(result)
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if last_result_is_exception?
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exception_handler.call(output, result, self)
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elsif should_print?
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print.call(output, result, self)
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else
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# nothin'
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end
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rescue RescuableException => e
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# Being uber-paranoid here, given that this exception arose because we couldn't
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# serialize something in the user's program, let's not assume we can serialize
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# the exception either.
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begin
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output.puts "(pry) output error: #{e.inspect}\n#{e.backtrace.join("\n")}"
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rescue RescuableException => e
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if last_result_is_exception?
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output.puts "(pry) output error: failed to show exception"
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else
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output.puts "(pry) output error: failed to show result"
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end
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end
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ensure
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output.flush if output.respond_to?(:flush)
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end
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# Force `eval_string` into the encoding of `val`. [Issue #284]
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def ensure_correct_encoding!(val)
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if @eval_string.empty? &&
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val.respond_to?(:encoding) &&
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val.encoding != @eval_string.encoding
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@eval_string.force_encoding(val.encoding)
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end
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end
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private :ensure_correct_encoding!
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# If the given line is a valid command, process it in the context of the
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# current `eval_string` and binding.
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# @param [String] val The line to process.
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# @return [Boolean] `true` if `val` is a command, `false` otherwise
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def process_command(val)
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val = val.lstrip if /^\s\S/ !~ val
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val = val.chomp
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result = commands.process_line(val,
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target: current_binding,
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output: output,
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eval_string: @eval_string,
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pry_instance: self,
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hooks: hooks
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)
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# set a temporary (just so we can inject the value we want into eval_string)
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Pry.current[:pry_cmd_result] = result
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# note that `result` wraps the result of command processing; if a
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# command was matched and invoked then `result.command?` returns true,
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# otherwise it returns false.
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if result.command?
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if !result.void_command?
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# the command that was invoked was non-void (had a return value) and so we make
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# the value of the current expression equal to the return value
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# of the command.
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@eval_string.replace "::Pry.current[:pry_cmd_result].retval\n"
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end
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true
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else
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false
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end
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end
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# Same as process_command, but outputs exceptions to `#output` instead of
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# raising.
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# @param [String] val The line to process.
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# @return [Boolean] `true` if `val` is a command, `false` otherwise
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def process_command_safely(val)
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process_command(val)
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rescue CommandError, Pry::Slop::InvalidOptionError, MethodSource::SourceNotFoundError => e
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Pry.last_internal_error = e
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output.puts "Error: #{e.message}"
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true
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end
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# Run the specified command.
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# @param [String] val The command (and its params) to execute.
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# @return [Pry::Command::VOID_VALUE]
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# @example
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# pry_instance.run_command("ls -m")
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def run_command(val)
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commands.process_line(val,
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eval_string: @eval_string,
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target: current_binding,
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pry_instance: self,
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output: output
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)
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Pry::Command::VOID_VALUE
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end
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# Execute the specified hook.
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# @param [Symbol] name The hook name to execute
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# @param [*Object] args The arguments to pass to the hook
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# @return [Object, Exception] The return value of the hook or the exception raised
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#
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# If executing a hook raises an exception, we log that and then continue sucessfully.
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# To debug such errors, use the global variable $pry_hook_error, which is set as a
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# result.
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def exec_hook(name, *args, &block)
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e_before = hooks.errors.size
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hooks.exec_hook(name, *args, &block).tap do
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hooks.errors[e_before..-1].each do |e|
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output.puts "#{name} hook failed: #{e.class}: #{e.message}"
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output.puts "#{e.backtrace.first}"
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output.puts "(see _pry_.hooks.errors to debug)"
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end
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end
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end
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# Set the last result of an eval.
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# This method should not need to be invoked directly.
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# @param [Object] result The result.
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# @param [String] code The code that was run.
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def set_last_result(result, code="")
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@last_result_is_exception = false
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@output_ring << result
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self.last_result = result unless code =~ /\A\s*\z/
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end
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#
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# Set the last exception for a session.
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#
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# @param [Exception] e
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# the last exception.
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#
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def last_exception=(e)
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last_exception = Pry::LastException.new(e)
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@last_result_is_exception = true
|
|
@output_ring << last_exception
|
|
@last_exception = last_exception
|
|
end
|
|
|
|
# Update Pry's internal state after evalling code.
|
|
# This method should not need to be invoked directly.
|
|
# @param [String] code The code we just eval'd
|
|
def update_input_history(code)
|
|
# Always push to the @input_ring as the @output_ring is always pushed to.
|
|
@input_ring << code
|
|
if code
|
|
Pry.line_buffer.push(*code.each_line)
|
|
Pry.current_line += code.lines.count
|
|
end
|
|
end
|
|
|
|
# @return [Boolean] True if the last result is an exception that was raised,
|
|
# as opposed to simply an instance of Exception (like the result of
|
|
# Exception.new)
|
|
def last_result_is_exception?
|
|
@last_result_is_exception
|
|
end
|
|
|
|
# Whether the print proc should be invoked.
|
|
# Currently only invoked if the output is not suppressed.
|
|
# @return [Boolean] Whether the print proc should be invoked.
|
|
def should_print?
|
|
!@suppress_output
|
|
end
|
|
|
|
# Returns the appropriate prompt to use.
|
|
# @return [String] The prompt.
|
|
def select_prompt
|
|
object = current_binding.eval('self')
|
|
open_token = @indent.open_delimiters.last || @indent.stack.last
|
|
|
|
c = Pry::Config.assign({
|
|
object: object,
|
|
nesting_level: binding_stack.size - 1,
|
|
open_token: open_token,
|
|
session_line: Pry.history.session_line_count + 1,
|
|
history_line: Pry.history.history_line_count + 1,
|
|
expr_number: input_ring.count,
|
|
_pry_: self,
|
|
binding_stack: binding_stack,
|
|
input_ring: input_ring,
|
|
eval_string: @eval_string,
|
|
cont: !@eval_string.empty?
|
|
})
|
|
|
|
Pry.critical_section do
|
|
# If input buffer is empty then use normal prompt
|
|
if eval_string.empty?
|
|
generate_prompt(Array(prompt).first, c)
|
|
# Otherwise use the wait prompt (indicating multi-line expression)
|
|
else
|
|
generate_prompt(Array(prompt).last, c)
|
|
end
|
|
end
|
|
end
|
|
|
|
def generate_prompt(prompt_proc, conf)
|
|
if prompt_proc.arity == 1
|
|
prompt_proc.call(conf)
|
|
else
|
|
prompt_proc.call(conf.object, conf.nesting_level, conf._pry_)
|
|
end
|
|
end
|
|
private :generate_prompt
|
|
|
|
# the array that the prompt stack is stored in
|
|
def prompt_stack
|
|
@prompt_stack ||= Array.new
|
|
end
|
|
private :prompt_stack
|
|
|
|
# Pushes the current prompt onto a stack that it can be restored from later.
|
|
# Use this if you wish to temporarily change the prompt.
|
|
# @param [Array<Proc>] new_prompt
|
|
# @return [Array<Proc>] new_prompt
|
|
# @example
|
|
# new_prompt = [ proc { '>' }, proc { '>>' } ]
|
|
# push_prompt(new_prompt) # => new_prompt
|
|
def push_prompt(new_prompt)
|
|
prompt_stack.push new_prompt
|
|
end
|
|
|
|
# Pops the current prompt off of the prompt stack.
|
|
# If the prompt you are popping is the last prompt, it will not be popped.
|
|
# Use this to restore the previous prompt.
|
|
# @return [Array<Proc>] Prompt being popped.
|
|
# @example
|
|
# prompt1 = [ proc { '>' }, proc { '>>' } ]
|
|
# prompt2 = [ proc { '$' }, proc { '>' } ]
|
|
# pry = Pry.new :prompt => prompt1
|
|
# pry.push_prompt(prompt2)
|
|
# pry.pop_prompt # => prompt2
|
|
# pry.pop_prompt # => prompt1
|
|
# pry.pop_prompt # => prompt1
|
|
def pop_prompt
|
|
prompt_stack.size > 1 ? prompt_stack.pop : prompt
|
|
end
|
|
|
|
undef :pager if method_defined? :pager
|
|
# Returns the currently configured pager
|
|
# @example
|
|
# _pry_.pager.page text
|
|
def pager
|
|
Pry::Pager.new(self)
|
|
end
|
|
|
|
undef :output if method_defined? :output
|
|
# Returns an output device
|
|
# @example
|
|
# _pry_.output.puts "ohai!"
|
|
def output
|
|
Pry::Output.new(self)
|
|
end
|
|
|
|
# Raise an exception out of Pry.
|
|
#
|
|
# See Kernel#raise for documentation of parameters.
|
|
# See rb_make_exception for the inbuilt implementation.
|
|
#
|
|
# This is necessary so that the raise-up command can tell the
|
|
# difference between an exception the user has decided to raise,
|
|
# and a mistake in specifying that exception.
|
|
#
|
|
# (i.e. raise-up RunThymeError.new should not be the same as
|
|
# raise-up NameError, "unititialized constant RunThymeError")
|
|
#
|
|
def raise_up_common(force, *args)
|
|
exception = if args == []
|
|
last_exception || RuntimeError.new
|
|
elsif args.length == 1 && args.first.is_a?(String)
|
|
RuntimeError.new(args.first)
|
|
elsif args.length > 3
|
|
raise ArgumentError, "wrong number of arguments"
|
|
elsif !args.first.respond_to?(:exception)
|
|
raise TypeError, "exception class/object expected"
|
|
elsif args.length === 1
|
|
args.first.exception
|
|
else
|
|
args.first.exception(args[1])
|
|
end
|
|
|
|
raise TypeError, "exception object expected" unless exception.is_a? Exception
|
|
|
|
exception.set_backtrace(args.length === 3 ? args[2] : caller(1))
|
|
|
|
if force || binding_stack.one?
|
|
binding_stack.clear
|
|
throw :raise_up, exception
|
|
else
|
|
binding_stack.pop
|
|
raise exception
|
|
end
|
|
end
|
|
|
|
def raise_up(*args); raise_up_common(false, *args); end
|
|
|
|
def raise_up!(*args); raise_up_common(true, *args); end
|
|
|
|
# Convenience accessor for the `quiet` config key.
|
|
# @return [Boolean]
|
|
def quiet?
|
|
config.quiet
|
|
end
|
|
end
|
|
# rubocop:enable Metrics/ClassLength
|