diff options
Diffstat (limited to 'lib/gitlab/i18n/po_linter.rb')
| -rw-r--r-- | lib/gitlab/i18n/po_linter.rb | 193 |
1 files changed, 193 insertions, 0 deletions
diff --git a/lib/gitlab/i18n/po_linter.rb b/lib/gitlab/i18n/po_linter.rb new file mode 100644 index 00000000000..201d73cfe1d --- /dev/null +++ b/lib/gitlab/i18n/po_linter.rb @@ -0,0 +1,193 @@ +require 'simple_po_parser' + +module Gitlab + module I18n + class PoLinter + attr_reader :po_path, :entries, :locale + + VARIABLE_REGEX = /%{\w*}|%[a-z]/.freeze + + def initialize(po_path, locale = I18n.locale.to_s) + @po_path = po_path + @locale = locale + end + + def errors + @errors ||= validate_po + end + + def validate_po + if parse_error = parse_po + return 'PO-syntax errors' => [parse_error] + end + + validate_entries + end + + def parse_po + @entries = SimplePoParser.parse(po_path) + nil + rescue SimplePoParser::ParserError => e + @entries = [] + e.message + end + + def validate_entries + errors = {} + + entries.each do |entry| + # Skip validation of metadata + next if entry[:msgid].empty? + + errors_for_entry = validate_entry(entry) + errors[join_message(entry[:msgid])] = errors_for_entry if errors_for_entry.any? + end + + errors + end + + def validate_entry(entry) + errors = [] + + validate_flags(errors, entry) + validate_variables(errors, entry) + validate_newlines(errors, entry) + + errors + end + + def validate_newlines(errors, entry) + message_id = join_message(entry[:msgid]) + + if entry[:msgid].is_a?(Array) + errors << "<#{message_id}> is defined over multiple lines, this breaks some tooling." + end + + if translations_in_entry(entry).any? { |translation| translation.is_a?(Array) } + errors << "<#{message_id}> has translations defined over multiple lines, this breaks some tooling." + end + end + + def validate_variables(errors, entry) + if entry[:msgid_plural].present? + validate_variables_in_message(errors, entry[:msgid], entry['msgstr[0]']) + + # Validate all plurals + entry.keys.select { |key_name| key_name =~ /msgstr\[[1-9]\]/ }.each do |plural_key| + validate_variables_in_message(errors, entry[:msgid_plural], entry[plural_key]) + end + else + validate_variables_in_message(errors, entry[:msgid], entry[:msgstr]) + end + end + + def validate_variables_in_message(errors, message_id, message_translation) + message_id = join_message(message_id) + required_variables = message_id.scan(VARIABLE_REGEX) + + validate_unnamed_variables(errors, required_variables) + validate_translation(errors, message_id, required_variables) + validate_variable_usage(errors, message_translation, required_variables) + end + + def validate_translation(errors, message_id, used_variables) + variables = fill_in_variables(used_variables) + + begin + Gitlab::I18n.with_locale(locale) do + translated = if message_id.include?('|') + FastGettext::Translation.s_(message_id) + else + FastGettext::Translation._(message_id) + end + + translated % variables + end + + # `sprintf` could raise an `ArgumentError` when invalid passing something + # other than a Hash when using named variables + # + # `sprintf` could raise `TypeError` when passing a wrong type when using + # unnamed variables + # + # FastGettext::Translation could raise `RuntimeError` (raised as a string), + # or as subclassess `NoTextDomainConfigured` & `InvalidFormat` + # + # `FastGettext::Translation` could raise `ArgumentError` as subclassess + # `InvalidEncoding`, `IllegalSequence` & `InvalidCharacter` + rescue ArgumentError, TypeError, RuntimeError => e + errors << "Failure translating to #{locale} with #{variables}: #{e.message}" + end + end + + def fill_in_variables(variables) + if variables.empty? + [] + elsif variables.any? { |variable| unnamed_variable?(variable) } + variables.map do |variable| + variable == '%d' ? Random.rand(1000) : Gitlab::Utils.random_string + end + else + variables.inject({}) do |hash, variable| + variable_name = variable[/\w+/] + hash[variable_name] = Gitlab::Utils.random_string + hash + end + end + end + + def validate_unnamed_variables(errors, variables) + if variables.size > 1 && variables.any? { |variable_name| unnamed_variable?(variable_name) } + errors << 'is combining multiple unnamed variables' + end + end + + def validate_variable_usage(errors, translation, required_variables) + translation = join_message(translation) + + # We don't need to validate when the message is empty. + # Translations could fallback to the default, or we could be validating a + # language that does not have plurals. + return if translation.empty? + + found_variables = translation.scan(VARIABLE_REGEX) + + missing_variables = required_variables - found_variables + if missing_variables.any? + errors << "<#{translation}> is missing: [#{missing_variables.to_sentence}]" + end + + unknown_variables = found_variables - required_variables + if unknown_variables.any? + errors << "<#{translation}> is using unknown variables: [#{unknown_variables.to_sentence}]" + end + end + + def unnamed_variable?(variable_name) + !variable_name.start_with?('%{') + end + + def validate_flags(errors, entry) + if flag = entry[:flag] + errors << "is marked #{flag}" + end + end + + def join_message(message) + Array(message).join + end + + def translations_in_entry(entry) + if entry[:msgid_plural].present? + entry.fetch_values(*plural_translation_keys_in_entry(entry)) + else + [entry[:msgstr]] + end + end + + def plural_translation_keys_in_entry(entry) + entry.keys.select { |key| key =~ /msgstr\[\d*\]/ } + end + end + end +end |