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module Slop
class Parser
# Our Options instance.
attr_reader :options
# A Hash of configuration options.
attr_reader :config
# Returns an Array of String arguments that were not parsed.
attr_reader :arguments
def initialize(options, **config)
@options = options
@config = config
reset
end
# Reset the parser, useful to use the same instance to parse a second
# time without duplicating state.
def reset
@arguments = []
@options.each(&:reset)
self
end
# Traverse `strings` and process options one by one. Anything after
# `--` is ignored. If a flag includes a equals (=) it will be split
# so that `flag, argument = s.split('=')`.
#
# The `call` method will be executed immediately for each option found.
# Once all options have been executed, any found options will have
# the `finish` method called on them.
#
# Returns a Slop::Result.
def parse(strings)
reset # reset before every parse
# ignore everything after "--"
strings, ignored_args = partition(strings)
pairs = strings.each_cons(2).to_a
# this ensures we still support the last string being a flag,
# otherwise it'll only be used as an argument.
pairs << [strings.last, nil]
@arguments = strings.dup
pairs.each_with_index do |pair, idx|
flag, arg = pair
break if !flag
# support `foo=bar`
orig_flag = flag.dup
if match = flag.match(/([^=]+)=([^=]*)/)
flag, arg = match.captures
end
if opt = try_process(flag, arg)
# since the option was parsed, we remove it from our
# arguments (plus the arg if necessary)
# delete argument first while we can find its index.
if opt.expects_argument?
# if we consumed the argument, remove the next pair
if consume_next_argument?(orig_flag)
pairs.delete_at(idx + 1)
end
arguments.each_with_index do |argument, i|
if argument == orig_flag && !orig_flag.include?("=")
arguments.delete_at(i + 1)
end
end
end
arguments.delete(orig_flag)
end
end
@arguments += ignored_args
if !suppress_errors?
unused_options.each do |o|
if o.config[:required]
pretty_flags = o.flags.map { |f| "`#{f}'" }.join(", ")
raise MissingRequiredOption, "missing required option #{pretty_flags}"
end
end
end
Result.new(self).tap do |result|
used_options.each { |o| o.finish(result) }
end
end
# Returns an Array of Option instances that were used.
def used_options
options.select { |o| o.count > 0 }
end
# Returns an Array of Option instances that were not used.
def unused_options
options.to_a - used_options
end
private
def consume_next_argument?(flag)
return false if flag.include?("=")
return true if flag.start_with?("--")
return true if /\A-[a-zA-Z]\z/ === flag
false
end
# We've found an option, process and return it
def process(option, arg)
option.ensure_call(arg)
option
end
# Try and find an option to process
def try_process(flag, arg)
if option = matching_option(flag)
process(option, arg)
elsif flag.start_with?("--no-") && option = matching_option(flag.sub("no-", ""))
process(option, false)
elsif flag =~ /\A-[^-]{2,}/
try_process_smashed_arg(flag) || try_process_grouped_flags(flag, arg)
else
if flag.start_with?("-") && !suppress_errors?
raise UnknownOption.new("unknown option `#{flag}'", "#{flag}")
end
end
end
# try and process a flag with a "smashed" argument, e.g.
# -nFoo or -i5
def try_process_smashed_arg(flag)
option = matching_option(flag[0, 2])
if option && option.expects_argument?
process(option, flag[2..-1])
end
end
# try and process as a set of grouped short flags. drop(1) removes
# the prefixed -, then we add them back to each flag separately.
def try_process_grouped_flags(flag, arg)
flags = flag.split("").drop(1).map { |f| "-#{f}" }
last = flags.pop
flags.each { |f| try_process(f, nil) }
try_process(last, arg) # send the argument to the last flag
end
def suppress_errors?
config[:suppress_errors]
end
def matching_option(flag)
options.find { |o| o.flags.include?(flag) }
end
def partition(strings)
if strings.include?("--")
partition_idx = strings.index("--")
return [[], strings[1..-1]] if partition_idx.zero?
[strings[0..partition_idx-1], strings[partition_idx+1..-1]]
else
[strings, []]
end
end
end
end
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