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class Pry
# The list of configuration options.
CONFIG_OPTIONS = [:input, :output, :commands, :print,
:prompt, :hooks]
attr_accessor *CONFIG_OPTIONS
# Returns the target binding for the session. Note that altering this
# attribute will not change the target binding.
# @return [Binding] The target object for the session
attr_accessor :session_target
# Create a new `Pry` object.
# @param [Hash] options The optional configuration parameters.
# @option options [#readline] :input The object to use for input.
# @option options [#puts] :output The object to use for output.
# @option options [Pry::CommandBase] :commands The object to use for
# commands. (see commands.rb)
# @option options [Hash] :hooks The defined hook Procs (see hooks.rb)
# @option options [Array<Proc>] :default_prompt The array of Procs
# to use for the prompts. (see prompts.rb)
# @option options [Proc] :print The Proc to use for the 'print'
# component of the REPL. (see print.rb)
def initialize(options={})
default_options = {}
CONFIG_OPTIONS.each { |v| default_options[v] = Pry.send(v) }
default_options.merge!(options)
CONFIG_OPTIONS.each do |key|
instance_variable_set("@#{key}", default_options[key])
end
end
# Get nesting data.
# This method should not need to be accessed directly.
# @return [Array] The unparsed nesting information.
def nesting
self.class.nesting
end
# Set nesting data.
# This method should not need to be accessed directly.
# @param v nesting data.
def nesting=(v)
self.class.nesting = v
end
# Return parent of current Pry session.
# @return [Pry] The parent of the current Pry session.
def parent
idx = Pry.sessions.index(self)
if idx > 0
Pry.sessions[idx - 1]
else
nil
end
end
# Execute the hook `hook_name`, if it is defined.
# @param [Symbol] hook_name The hook to execute
# @param [Array] args The arguments to pass to the hook.
def exec_hook(hook_name, *args, &block)
hooks[hook_name].call(*args, &block) if hooks[hook_name]
end
# Initialize the repl session.
# @param [Binding] target The target binding for the session.
def repl_prologue(target)
exec_hook :before_session, output, target
Pry.active_instance = self
# Make sure special locals exist
target.eval("_pry_ = Pry.active_instance")
target.eval("_ = Pry.last_result")
self.session_target = target
end
# Clean-up after the repl session.
# @param [Binding] target The target binding for the session.
# @return [Object] The return value of the repl session (if one exists).
def repl_epilogue(target, nesting_level, break_data)
nesting.pop
exec_hook :after_session, output, target
# If break_data is an array, then the last element is the return value
break_level, return_value = Array(break_data)
# keep throwing until we reach the desired nesting level
if nesting_level != break_level
throw :breakout, break_data
end
return_value
end
# Start a read-eval-print-loop.
# If no parameter is given, default to top-level (main).
# @param [Object, Binding] target The receiver of the Pry session
# @return [Object] The target of the Pry session or an explictly given
# return value. If given return value is `nil` or no return value
# is specified then `target` will be returned.
# @example
# Pry.new.repl(Object.new)
def repl(target=TOPLEVEL_BINDING)
target = Pry.binding_for(target)
target_self = target.eval('self')
repl_prologue(target)
# cannot rely on nesting.level as
# nesting.level changes with new sessions
nesting_level = nesting.size
break_data = catch(:breakout) do
nesting.push [nesting.size, target_self, self]
loop do
rep(target)
end
end
return_value = repl_epilogue(target, nesting_level, break_data)
# if one was provided, return the return value
return return_value if return_value
# otherwise return the target_self
target_self
end
# Perform a read-eval-print.
# If no parameter is given, default to top-level (main).
# @param [Object, Binding] target The receiver of the read-eval-print
# @example
# Pry.new.rep(Object.new)
def rep(target=TOPLEVEL_BINDING)
target = Pry.binding_for(target)
print.call output, re(target)
end
# Perform a read-eval
# If no parameter is given, default to top-level (main).
# @param [Object, Binding] target The receiver of the read-eval-print
# @return [Object] The result of the eval or an `Exception` object in case of error.
# @example
# Pry.new.re(Object.new)
def re(target=TOPLEVEL_BINDING)
target = Pry.binding_for(target)
if input == Readline
# Readline tab completion
Readline.completion_proc = Pry::InputCompleter.build_completion_proc(target, commands.commands.keys)
end
# save the pry instance to active_instance
Pry.active_instance = self
target.eval("_pry_ = Pry.active_instance")
# eval the expression and save to last_result
# Do not want __FILE__, __LINE__ here because we need to distinguish
# (eval) methods for show-method and friends.
# This also sets the `_` local for the session.
set_last_result(target.eval(r(target)), target)
rescue SystemExit => e
exit
rescue Exception => e
set_last_exception(e, target)
end
# Perform a read.
# If no parameter is given, default to top-level (main).
# This is a multi-line read; so the read continues until a valid
# Ruby expression is received.
# Pry commands are also accepted here and operate on the target.
# @param [Object, Binding] target The receiver of the read.
# @return [String] The Ruby expression.
# @example
# Pry.new.r(Object.new)
def r(target=TOPLEVEL_BINDING)
target = Pry.binding_for(target)
eval_string = ""
loop do
current_prompt = select_prompt(eval_string.empty?, target.eval('self'))
val = readline(current_prompt)
# exit pry if we receive EOF character
if !val
output.puts
throw(:breakout, nesting.level)
end
val.chomp!
Pry.cmd_ret_value = process_commands(val, eval_string, target)
if Pry.cmd_ret_value
eval_string << "Pry.cmd_ret_value\n"
else
eval_string << "#{val}\n"
end
break eval_string if valid_expression?(eval_string)
end
end
# Set the last result of an eval.
# @param [Object] result The result.
# @param [Binding] target The binding to set `_` on.
def set_last_result(result, target)
Pry.last_result = result
target.eval("_ = Pry.last_result")
end
# Set the last exception for a session.
# @param [Exception] ex The exception.
# @param [Binding] target The binding to set `_ex_` on.
def set_last_exception(ex, target)
Pry.last_exception = ex
target.eval("_ex_ = Pry.last_exception")
end
# Process Pry commands. Pry commands are not Ruby methods and are evaluated
# prior to Ruby expressions.
# Commands can be modified/configured by the user: see `Pry::Commands`
# This method should not need to be invoked directly - it is called
# by `Pry#r`.
# @param [String] val The current line of input.
# @param [String] eval_string The cumulative lines of input for
# multi-line input.
# @param [Binding] target The receiver of the commands.
def process_commands(val, eval_string, target)
def val.clear() replace("") end
def eval_string.clear() replace("") end
pattern, cmd_data = commands.commands.find do |name, cmd_data|
/^#{name}(?!\S)(?:\s+(.+))?/ =~ val
end
# no command was matched, so return to caller
return if !pattern
args_string = $1
args = args_string ? Shellwords.shellwords(args_string) : []
action = cmd_data[:action]
keep_retval = cmd_data[:keep_retval]
options = {
:val => val,
:eval_string => eval_string,
:nesting => nesting,
:commands => commands.commands
}
# set some useful methods to be used by the action blocks
commands.opts = options
commands.target = target
commands.output = output
case action.arity <=> 0
when -1
# Use instance_exec() to make the `opts` method, etc available
ret_value = commands.instance_exec(*args, &action)
when 1, 0
# ensure that we get the right number of parameters
# since 1.8.7 complains about incorrect arity (1.9.2
# doesn't care)
args_with_corrected_arity = args.values_at *0..(action.arity - 1)
ret_value = commands.instance_exec(*args_with_corrected_arity, &action)
end
# a command was processed so we can now clear the input string
val.clear
# return value of block only if :keep_retval is true
ret_value if keep_retval
end
# Returns the next line of input to be used by the pry instance.
# This method should not need to be invoked directly.
# @param [String] current_prompt The prompt to use for input.
# @return [String] The next line of input.
def readline(current_prompt="> ")
if input == Readline
# Readline must be treated differently
# as it has a second parameter.
input.readline(current_prompt, true)
else
if input.method(:readline).arity == 1
input.readline(current_prompt)
else
input.readline
end
end
end
# Returns the appropriate prompt to use.
# This method should not need to be invoked directly.
# @param [Boolean] first_line Whether this is the first line of input
# (and not multi-line input).
# @param [Object] target_self The receiver of the Pry session.
# @return [String] The prompt.
def select_prompt(first_line, target_self)
if first_line
Array(prompt).first.call(target_self, nesting.level)
else
Array(prompt).last.call(target_self, nesting.level)
end
end
if RUBY_VERSION =~ /1.9/
require 'ripper'
# Determine if a string of code is a valid Ruby expression.
# Ruby 1.9 uses Ripper, Ruby 1.8 uses RubyParser.
# @param [String] code The code to validate.
# @return [Boolean] Whether or not the code is a valid Ruby expression.
# @example
# valid_expression?("class Hello") #=> false
# valid_expression?("class Hello; end") #=> true
def valid_expression?(code)
!!Ripper::SexpBuilder.new(code).parse
end
else
require 'ruby_parser'
# Determine if a string of code is a valid Ruby expression.
# Ruby 1.9 uses Ripper, Ruby 1.8 uses RubyParser.
# @param [String] code The code to validate.
# @return [Boolean] Whether or not the code is a valid Ruby expression.
# @example
# valid_expression?("class Hello") #=> false
# valid_expression?("class Hello; end") #=> true
def valid_expression?(code)
RubyParser.new.parse(code)
rescue Racc::ParseError, SyntaxError
false
else
true
end
end
end
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