120 lines
3.5 KiB
Ruby
120 lines
3.5 KiB
Ruby
require "yawpa/version"
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# Example options configuration:
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# {
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# version: {},
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# verbose: {aliases: ['-v']},
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# get: {nargs: 1},
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# set: {nargs: 2},
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# }
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module Yawpa
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class UnknownOptionException < Exception; end
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class InvalidArgumentsException < Exception; end
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module_function
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def parse(params, options)
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options = _massage_options(options)
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opts = {}
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args = []
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i = 0
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while i < params.length
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param = params[i]
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if param =~ /^--([^=]+)(?:=(.+))?$/
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param_name, val = $1, $2
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if options[param_name].nil?
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raise UnknownOptionException.new("Unknown option '#{param_name}'")
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end
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opt_config = options[param_name]
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param_key = opt_config[:key]
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if opt_config[:nargs].last == 0
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opts[param_key] = true
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else
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opts[param_key] = []
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opts[param_key] << val if val
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if opts[param_key].length < opt_config[:nargs].last
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gathered = _gather(i + 1, opt_config[:nargs].last - opts[param_key].length, params)
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i += gathered.length
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opts[param_key] += gathered
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if opts[param_key].length < opt_config[:nargs].first
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raise InvalidArgumentsException.new("Not enough arguments supplied for option '#{param_key}'")
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end
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end
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end
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elsif param =~ /^-(.+)$/
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short_flags = $1
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short_idx = 0
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while short_idx < short_flags.length
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opt_config = _find_opt_config_by_short_name(options, short_flags[short_idx])
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if opt_config.nil?
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raise UnknownOptionException.new("Unknown option '-#{short_flags[short_idx]}'")
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end
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param_key = opt_config[:key]
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if opt_config[:nargs].last == 0
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opts[param_key] = true
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else
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opts[param_key] = []
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if short_idx + 1 < short_flags.length
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opts[param_key] << short_flags[short_idx + 1, short_flags.length]
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end
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if opts[param_key].length < opt_config[:nargs].last
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gathered = _gather(i + 1, opt_config[:nargs].last - opts[param_key].length, params)
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i += gathered.length
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opts[param_key] += gathered
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if opts[param_key].length < opt_config[:nargs].first
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raise InvalidArgumentsException.new("Not enough arguments supplied for option '#{param_key}'")
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end
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end
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break
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end
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short_idx += 1
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end
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else
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args << params[i]
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end
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i += 1
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end
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# Condense 1-element arrays of option values to just the element itself
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opts.each_key do |k|
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if opts[k].class == Array and opts[k].length == 1
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opts[k] = opts[k].first
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end
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end
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return [opts, args]
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end
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def _gather(start_idx, max, params)
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result = []
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index = start_idx
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loop do
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break if index >= params.length
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break if params[index][0] == '-'
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result << params[index]
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index += 1
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break if result.length == max
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end
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result
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end
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def _massage_options(options)
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{}.tap do |newopts|
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options.each_pair do |k, v|
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newkey = k.to_s
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newopts[newkey] = {key: k}
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nargs = v[:nargs] || 0
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nargs = (nargs..nargs) if nargs.class == Fixnum
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newopts[newkey][:nargs] = nargs
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newopts[newkey][:short] = v[:short] || ''
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end
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end
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end
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def _find_opt_config_by_short_name(options, short_name)
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options.each_pair do |k, v|
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return v if v[:short] == short_name
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end
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nil
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end
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end
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