diff options
Diffstat (limited to 'AK/Format.cpp')
| -rw-r--r-- | AK/Format.cpp | 258 |
1 files changed, 142 insertions, 116 deletions
diff --git a/AK/Format.cpp b/AK/Format.cpp index cae1410a46..1144a42065 100644 --- a/AK/Format.cpp +++ b/AK/Format.cpp @@ -33,204 +33,230 @@ namespace { +constexpr size_t use_next_index = NumericLimits<size_t>::max(); + struct FormatSpecifier { StringView flags; - size_t index { 0 }; + size_t index; }; -static bool find_next_unescaped(size_t& index, StringView input, char ch) -{ - constexpr size_t unset = NumericLimits<size_t>::max(); - - index = unset; - for (size_t idx = 0; idx < input.length(); ++idx) { - if (input[idx] == ch) { - if (index == unset) - index = idx; - else - index = unset; - } else if (index != unset) { - return true; - } +class FormatStringParser : public GenericLexer { +public: + explicit FormatStringParser(StringView input) + : GenericLexer(input) + { } - return index != unset; -} -static bool find_next(size_t& index, StringView input, char ch) -{ - for (index = 0; index < input.length(); ++index) { - if (input[index] == ch) - return index; - } + StringView consume_literal() + { + const auto begin = tell(); - return false; -} -static void write_escaped_literal(StringBuilder& builder, StringView literal) -{ - for (size_t idx = 0; idx < literal.length(); ++idx) { - builder.append(literal[idx]); - if (literal[idx] == '{' || literal[idx] == '}') - ++idx; + while (!is_eof()) { + if (consume_specific("{{")) + continue; + + if (consume_specific("}}")) + continue; + + if (next_is(is_any_of("{}"))) + return m_input.substring_view(begin, tell() - begin); + + consume(); + } + + return m_input.substring_view(begin); } -} -static bool parse_number(GenericLexer& lexer, size_t& value) -{ - value = 0; + bool consume_number(size_t& value) + { + value = 0; - bool consumed_at_least_one = false; - while (!lexer.is_eof()) { - if (lexer.next_is(isdigit)) { + bool consumed_at_least_one = false; + while (next_is(isdigit)) { value *= 10; - value += lexer.consume() - '0'; + value += consume() - '0'; consumed_at_least_one = true; - } else { - break; } + + return consumed_at_least_one; } - return consumed_at_least_one; -} + bool consume_specifier(FormatSpecifier& specifier) + { + ASSERT(!next_is('}')); -constexpr size_t use_next_index = NumericLimits<size_t>::max(); + if (!consume_specific('{')) + return false; -static bool parse_format_specifier(StringView input, FormatSpecifier& specifier) -{ - GenericLexer lexer { input }; + if (!consume_number(specifier.index)) + specifier.index = use_next_index; - if (!parse_number(lexer, specifier.index)) - specifier.index = use_next_index; + if (consume_specific(':')) { + const auto begin = tell(); - if (!lexer.consume_specific(':')) - return lexer.is_eof(); + size_t level = 1; + while (level > 0) { + ASSERT(!is_eof()); - specifier.flags = lexer.consume_all(); - return true; -} + if (consume_specific('{')) { + ++level; + continue; + } -static bool parse_nested_replacement_field(GenericLexer& lexer, size_t& index) -{ - if (!lexer.consume_specific('{')) - return false; + if (consume_specific('}')) { + --level; + continue; + } - if (!parse_number(lexer, index)) - index = use_next_index; + consume(); + } - if (!lexer.consume_specific('}')) - ASSERT_NOT_REACHED(); + specifier.flags = m_input.substring_view(begin, tell() - begin - 1); + } else { + if (!consume_specific('}')) + ASSERT_NOT_REACHED(); - return true; -} + specifier.flags = ""; + } -} // namespace + return true; + } -namespace AK { + bool consume_replacement_field(size_t& index) + { + if (!consume_specific('{')) + return false; -void vformat(StringBuilder& builder, StringView fmtstr, AK::Span<const TypeErasedParameter> parameters, size_t argument_index) -{ - size_t opening; - if (!find_next_unescaped(opening, fmtstr, '{')) { - size_t dummy; - if (find_next_unescaped(dummy, fmtstr, '}')) + if (!consume_number(index)) + return use_next_index; + + if (!consume_specific('}')) ASSERT_NOT_REACHED(); - write_escaped_literal(builder, fmtstr); - return; + return true; } +}; - write_escaped_literal(builder, fmtstr.substring_view(0, opening)); +void write_escaped_literal(StringBuilder& builder, StringView literal) +{ + for (size_t idx = 0; idx < literal.length(); ++idx) { + builder.append(literal[idx]); + if (literal[idx] == '{' || literal[idx] == '}') + ++idx; + } +} - size_t closing; - if (!find_next(closing, fmtstr.substring_view(opening), '}')) - ASSERT_NOT_REACHED(); - closing += opening; +void vformat_impl(StringBuilder& builder, FormatStringParser& parser, Span<const AK::TypeErasedParameter> parameters, size_t argument_index = 0) +{ + const auto literal = parser.consume_literal(); + write_escaped_literal(builder, literal); FormatSpecifier specifier; - if (!parse_format_specifier(fmtstr.substring_view(opening + 1, closing - (opening + 1)), specifier)) - ASSERT_NOT_REACHED(); + if (!parser.consume_specifier(specifier)) { + ASSERT(parser.is_eof()); + return; + } - if (specifier.index == NumericLimits<size_t>::max()) + if (specifier.index == use_next_index) specifier.index = argument_index++; - if (specifier.index >= parameters.size()) - ASSERT_NOT_REACHED(); + ASSERT(specifier.index < parameters.size()); auto& parameter = parameters[specifier.index]; parameter.formatter(builder, parameter.value, specifier.flags, parameters); - vformat(builder, fmtstr.substring_view(closing + 1), parameters, argument_index); + vformat_impl(builder, parser, parameters, argument_index); +} + +} // namespace + +namespace AK { + +void vformat(StringBuilder& builder, StringView fmtstr, Span<const TypeErasedParameter> parameters) +{ + FormatStringParser parser { fmtstr }; + vformat_impl(builder, parser, parameters); } void vformat(const LogStream& stream, StringView fmtstr, Span<const TypeErasedParameter> parameters) { StringBuilder builder; - vformat(builder, fmtstr, parameters); + FormatStringParser parser { fmtstr }; + vformat_impl(builder, parser, parameters); stream << builder.to_string(); } -void StandardFormatter::parse(StringView specifier) +void StandardFormatter::parse(StringView flags) { - GenericLexer lexer { specifier }; + FormatStringParser parser { flags }; - if (StringView { "<^>" }.contains(lexer.peek(1))) { - ASSERT(!lexer.next_is(is_any_of("{}"))); - m_fill = lexer.consume(); + if (StringView { "<^>" }.contains(parser.peek(1))) { + ASSERT(!parser.next_is(is_any_of("{}"))); + m_fill = parser.consume(); } - if (lexer.consume_specific('<')) + if (parser.consume_specific('<')) m_align = Align::Left; - else if (lexer.consume_specific('^')) + else if (parser.consume_specific('^')) m_align = Align::Center; - else if (lexer.consume_specific('>')) + else if (parser.consume_specific('>')) m_align = Align::Right; - if (lexer.consume_specific('-')) + if (parser.consume_specific('-')) m_sign = Sign::NegativeOnly; - else if (lexer.consume_specific('+')) + else if (parser.consume_specific('+')) m_sign = Sign::PositiveAndNegative; - else if (lexer.consume_specific(' ')) + else if (parser.consume_specific(' ')) m_sign = Sign::ReserveSpace; - if (lexer.consume_specific('#')) + if (parser.consume_specific('#')) m_alternative_form = true; - if (lexer.consume_specific('0')) + if (parser.consume_specific('0')) m_zero_pad = true; - if (size_t index = 0; parse_nested_replacement_field(lexer, index)) + if (size_t index = 0; parser.consume_replacement_field(index)) { + if (index == use_next_index) + TODO(); + m_width = value_from_arg + index; - else if (size_t width = 0; parse_number(lexer, width)) + } else if (size_t width = 0; parser.consume_number(width)) { m_width = width; + } + + if (parser.consume_specific('.')) { + if (size_t index = 0; parser.consume_replacement_field(index)) { + if (index == use_next_index) + TODO(); - if (lexer.consume_specific('.')) { - if (size_t index = 0; parse_nested_replacement_field(lexer, index)) m_precision = value_from_arg + index; - else if (size_t precision = 0; parse_number(lexer, precision)) + } else if (size_t precision = 0; parser.consume_number(precision)) { m_precision = precision; + } } - if (lexer.consume_specific('b')) + if (parser.consume_specific('b')) m_mode = Mode::Binary; - else if (lexer.consume_specific('B')) + else if (parser.consume_specific('B')) m_mode = Mode::BinaryUppercase; - else if (lexer.consume_specific('d')) + else if (parser.consume_specific('d')) m_mode = Mode::Decimal; - else if (lexer.consume_specific('o')) + else if (parser.consume_specific('o')) m_mode = Mode::Octal; - else if (lexer.consume_specific('x')) + else if (parser.consume_specific('x')) m_mode = Mode::Hexadecimal; - else if (lexer.consume_specific('X')) + else if (parser.consume_specific('X')) m_mode = Mode::HexadecimalUppercase; - else if (lexer.consume_specific('c')) + else if (parser.consume_specific('c')) m_mode = Mode::Character; - else if (lexer.consume_specific('s')) + else if (parser.consume_specific('s')) m_mode = Mode::String; - else if (lexer.consume_specific('p')) + else if (parser.consume_specific('p')) m_mode = Mode::Pointer; - if (!lexer.is_eof()) - dbg() << __PRETTY_FUNCTION__ << " did not consume '" << lexer.remaining() << "'"; + if (!parser.is_eof()) + dbg() << __PRETTY_FUNCTION__ << " did not consume '" << parser.remaining() << "'"; - ASSERT(lexer.is_eof()); + ASSERT(parser.is_eof()); } void Formatter<StringView>::format(StringBuilder& builder, StringView value, Span<const TypeErasedParameter>) |