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require 'readline'
class Pry
# The list of configuration options.
ConfigOptions = [:input, :output, :commands, :print,
:prompt, :hooks]
attr_accessor *ConfigOptions
# 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={})
h = {}
ConfigOptions.each { |v| h[v] = Pry.send(v) }
default_options = h
default_options.merge!(options)
ConfigOptions.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
# 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
# @example
# Pry.new.repl(Object.new)
def repl(target=TOPLEVEL_BINDING)
target = binding_for(target)
target_self = target.eval('self')
exec_hook :before_session, output, target_self
# cannot rely on nesting.level as
# nesting.level changes with new sessions
nesting_level = nesting.size
Pry.active_instance = self
# Make sure special locals exist
target.eval("_pry_ = Pry.active_instance")
target.eval("_ = Pry.last_result")
break_level = catch(:breakout) do
nesting.push [nesting.size, target_self, self]
loop do
rep(target)
end
end
nesting.pop
exec_hook :after_session, output, target_self
# keep throwing until we reach the desired nesting level
if nesting_level != break_level
throw :breakout, break_level
end
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 = 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 = binding_for(target)
if input == Readline
Readline.completion_proc = Pry::InputCompleter.build_completion_proc(target, commands.commands.keys)
end
# eval the expression and save to last_result
Pry.last_result = target.eval r(target)
# save the pry instance to active_instance
Pry.active_instance = self
# define locals _pry_ and _ (active instance and last expression)
target.eval("_pry_ = Pry.active_instance")
target.eval("_ = Pry.last_result")
rescue SystemExit => e
exit
rescue Exception => e
e
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 = binding_for(target)
eval_string = ""
loop do
current_prompt = select_prompt(eval_string.empty?, target.eval('self'))
val = readline(current_prompt)
val.chomp!
process_commands(val, eval_string, target)
eval_string << "#{val}\n"
break eval_string if valid_expression?(eval_string)
end
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, data = commands.commands.find do |name, data|
/^#{name}(?!\S)(?:\s+(.+))?/ =~ val
end
if pattern
args_string = $1
args = args_string ? args_string.split : []
action = data[:action]
options = {
:val => val,
:eval_string => eval_string,
:nesting => nesting,
:output => output,
:commands => commands.commands
}
# set some useful methods to be used by the action blocks
commands.opts = options
commands.target = target
commands.output = output
# send the correct number of parameters to the block (to avoid
# warnings in 1.8.7)
case action.arity <=> 0
when -1
commands.instance_exec(*args, &action)
when 1, 0
# ensure that we get the right number of parameters;
# using values_at we pad out missing parameters with nils so
# that 1.8.7 doesn't complain about incorrect arity (1.9.2
# doesn't care)
args_with_corrected_arity = args.values_at *0..(action.arity - 1)
# Use instance_exec() to make the `opts` method, etc available
commands.instance_exec(*args_with_corrected_arity, &action)
end
val.clear
end
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
# Return a `Binding` object for `target` or return `target` if it is
# already a `Binding`.
# In the case where `target` is top-level then return `TOPLEVEL_BINDING`
# @param [Object] target The object to get a `Binding` object for.
# @return [Binding] The `Binding` object.
def binding_for(target)
if target.is_a?(Binding)
target
else
if target == TOPLEVEL_BINDING.eval('self')
TOPLEVEL_BINDING
else
target.__binding__
end
end
end
end
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