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| 1 | +# frozen_string_literal: true |
| 2 | + |
| 3 | +module Git |
| 4 | + # Takes a hash of user options and a declarative map and produces |
| 5 | + # an array of command-line arguments. Also validates that only |
| 6 | + # supported options are provided based on the map. |
| 7 | + # |
| 8 | + # @api private |
| 9 | + class ArgsBuilder |
| 10 | + # This hash maps an option type to a lambda that knows how to build the |
| 11 | + # corresponding command-line argument. This is a scalable dispatch table. |
| 12 | + ARG_BUILDERS = { |
| 13 | + boolean: ->(config, value) { value ? config[:flag] : [] }, |
| 14 | + |
| 15 | + valued_equals: ->(config, value) { "#{config[:flag]}=#{value}" if value }, |
| 16 | + |
| 17 | + valued_space: ->(config, value) { [config[:flag], value.to_s] if value }, |
| 18 | + |
| 19 | + repeatable_valued_space: lambda do |config, value| |
| 20 | + Array(value).flat_map { |v| [config[:flag], v.to_s] } |
| 21 | + end, |
| 22 | + |
| 23 | + custom: ->(config, value) { config[:builder].call(value) }, |
| 24 | + |
| 25 | + validate_only: ->(_config, _value) { [] } # Does not build any args |
| 26 | + }.freeze |
| 27 | + |
| 28 | + # Main entrypoint to validate options and build arguments |
| 29 | + def self.build(opts, option_map) |
| 30 | + validate!(opts, option_map) |
| 31 | + new(opts, option_map).build |
| 32 | + end |
| 33 | + |
| 34 | + # Public validation method that can be called independently |
| 35 | + def self.validate!(opts, option_map) |
| 36 | + validate_unsupported_keys!(opts, option_map) |
| 37 | + validate_configured_options!(opts, option_map) |
| 38 | + end |
| 39 | + |
| 40 | + def initialize(opts, option_map) |
| 41 | + @opts = opts |
| 42 | + @option_map = option_map |
| 43 | + end |
| 44 | + |
| 45 | + def build |
| 46 | + @option_map.flat_map do |config| |
| 47 | + type = config[:type] |
| 48 | + next config[:flag] if type == :static |
| 49 | + |
| 50 | + key = config[:keys].find { |k| @opts.key?(k) } |
| 51 | + next [] unless key |
| 52 | + |
| 53 | + build_arg_for_option(config, @opts[key]) |
| 54 | + end.compact |
| 55 | + end |
| 56 | + |
| 57 | + private |
| 58 | + |
| 59 | + def build_arg_for_option(config, value) |
| 60 | + builder = ARG_BUILDERS[config[:type]] |
| 61 | + builder&.call(config, value) || [] |
| 62 | + end |
| 63 | + |
| 64 | + private_class_method def self.validate_unsupported_keys!(opts, option_map) |
| 65 | + all_valid_keys = option_map.flat_map { |config| config[:keys] }.compact |
| 66 | + unsupported_keys = opts.keys - all_valid_keys |
| 67 | + |
| 68 | + return if unsupported_keys.empty? |
| 69 | + |
| 70 | + raise ArgumentError, "Unsupported options: #{unsupported_keys.map(&:inspect).join(', ')}" |
| 71 | + end |
| 72 | + |
| 73 | + private_class_method def self.validate_configured_options!(opts, option_map) |
| 74 | + option_map.each do |config| |
| 75 | + next unless config[:keys] # Skip static flags |
| 76 | + |
| 77 | + check_for_missing_required_option!(opts, config) |
| 78 | + validate_option_value!(opts, config) |
| 79 | + end |
| 80 | + end |
| 81 | + |
| 82 | + private_class_method def self.check_for_missing_required_option!(opts, config) |
| 83 | + return unless config[:required] |
| 84 | + |
| 85 | + key_provided = config[:keys].any? { |k| opts.key?(k) } |
| 86 | + return if key_provided |
| 87 | + |
| 88 | + raise ArgumentError, "Missing required option: #{config[:keys].first}" |
| 89 | + end |
| 90 | + |
| 91 | + private_class_method def self.validate_option_value!(opts, config) |
| 92 | + validator = config[:validator] |
| 93 | + return unless validator |
| 94 | + |
| 95 | + user_key = config[:keys].find { |k| opts.key?(k) } |
| 96 | + return unless user_key # Don't validate if the user didn't provide the option |
| 97 | + |
| 98 | + return if validator.call(opts[user_key]) |
| 99 | + |
| 100 | + raise ArgumentError, "Invalid value for option: #{user_key}" |
| 101 | + end |
| 102 | + end |
| 103 | +end |
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