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2313e58393
Formatter<char> internally uses Formatter<StringView> when in
Mode::Character, but that would only accept Mode::{Default,String} and
ASSERT_NOT_REACHED() otherwise, causing String::formatted("{:c}", 'a')
to crash
710 lines
22 KiB
C++
710 lines
22 KiB
C++
/*
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* Copyright (c) 2020, the SerenityOS developers.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <AK/Format.h>
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#include <AK/GenericLexer.h>
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#include <AK/String.h>
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#include <AK/StringBuilder.h>
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#include <ctype.h>
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#ifdef KERNEL
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# include <Kernel/Process.h>
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# include <Kernel/Thread.h>
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#else
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# include <stdio.h>
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# include <unistd.h>
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#endif
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namespace AK {
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namespace {
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constexpr size_t use_next_index = NumericLimits<size_t>::max();
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// The worst case is that we have the largest 64-bit value formatted as binary number, this would take
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// 65 bytes. Choosing a larger power of two won't hurt and is a bit of mitigation against out-of-bounds accesses.
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inline size_t convert_unsigned_to_string(u64 value, Array<u8, 128>& buffer, u8 base, bool upper_case)
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{
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ASSERT(base >= 2 && base <= 16);
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static constexpr const char* lowercase_lookup = "0123456789abcdef";
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static constexpr const char* uppercase_lookup = "0123456789ABCDEF";
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if (value == 0) {
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buffer[0] = '0';
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return 1;
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}
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size_t used = 0;
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while (value > 0) {
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if (upper_case)
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buffer[used++] = uppercase_lookup[value % base];
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else
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buffer[used++] = lowercase_lookup[value % base];
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value /= base;
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}
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for (size_t i = 0; i < used / 2; ++i)
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swap(buffer[i], buffer[used - i - 1]);
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return used;
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}
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void vformat_impl(TypeErasedFormatParams& params, FormatBuilder& builder, FormatParser& parser)
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{
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const auto literal = parser.consume_literal();
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builder.put_literal(literal);
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FormatParser::FormatSpecifier specifier;
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if (!parser.consume_specifier(specifier)) {
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ASSERT(parser.is_eof());
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return;
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}
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if (specifier.index == use_next_index)
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specifier.index = params.take_next_index();
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auto& parameter = params.parameters().at(specifier.index);
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FormatParser argparser { specifier.flags };
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parameter.formatter(params, builder, argparser, parameter.value);
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vformat_impl(params, builder, parser);
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}
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} // namespace AK::{anonymous}
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size_t TypeErasedFormatParams::decode(size_t value, size_t default_value)
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{
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if (value == StandardFormatter::value_not_set)
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return default_value;
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if (value == StandardFormatter::value_from_next_arg)
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value = StandardFormatter::value_from_arg + take_next_index();
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if (value >= StandardFormatter::value_from_arg) {
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const auto parameter = parameters().at(value - StandardFormatter::value_from_arg);
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Optional<i64> svalue;
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if (parameter.type == TypeErasedParameter::Type::UInt8)
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value = *reinterpret_cast<const u8*>(parameter.value);
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else if (parameter.type == TypeErasedParameter::Type::UInt16)
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value = *reinterpret_cast<const u16*>(parameter.value);
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else if (parameter.type == TypeErasedParameter::Type::UInt32)
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value = *reinterpret_cast<const u32*>(parameter.value);
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else if (parameter.type == TypeErasedParameter::Type::UInt64)
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value = *reinterpret_cast<const u64*>(parameter.value);
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else if (parameter.type == TypeErasedParameter::Type::Int8)
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svalue = *reinterpret_cast<const i8*>(parameter.value);
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else if (parameter.type == TypeErasedParameter::Type::Int16)
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svalue = *reinterpret_cast<const i16*>(parameter.value);
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else if (parameter.type == TypeErasedParameter::Type::Int32)
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svalue = *reinterpret_cast<const i32*>(parameter.value);
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else if (parameter.type == TypeErasedParameter::Type::Int64)
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svalue = *reinterpret_cast<const i64*>(parameter.value);
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else
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ASSERT_NOT_REACHED();
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if (svalue.has_value()) {
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ASSERT(svalue.value() >= 0);
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value = static_cast<size_t>(svalue.value());
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}
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}
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return value;
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}
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FormatParser::FormatParser(StringView input)
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: GenericLexer(input)
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{
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}
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StringView FormatParser::consume_literal()
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{
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const auto begin = tell();
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while (!is_eof()) {
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if (consume_specific("{{"))
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continue;
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if (consume_specific("}}"))
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continue;
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if (next_is(is_any_of("{}")))
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return m_input.substring_view(begin, tell() - begin);
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consume();
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}
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return m_input.substring_view(begin);
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}
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bool FormatParser::consume_number(size_t& value)
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{
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value = 0;
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bool consumed_at_least_one = false;
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while (next_is(isdigit)) {
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value *= 10;
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value += consume() - '0';
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consumed_at_least_one = true;
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}
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return consumed_at_least_one;
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}
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bool FormatParser::consume_specifier(FormatSpecifier& specifier)
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{
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ASSERT(!next_is('}'));
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if (!consume_specific('{'))
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return false;
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if (!consume_number(specifier.index))
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specifier.index = use_next_index;
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if (consume_specific(':')) {
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const auto begin = tell();
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size_t level = 1;
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while (level > 0) {
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ASSERT(!is_eof());
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if (consume_specific('{')) {
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++level;
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continue;
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}
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if (consume_specific('}')) {
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--level;
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continue;
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}
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consume();
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}
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specifier.flags = m_input.substring_view(begin, tell() - begin - 1);
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} else {
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if (!consume_specific('}'))
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ASSERT_NOT_REACHED();
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specifier.flags = "";
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}
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return true;
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}
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bool FormatParser::consume_replacement_field(size_t& index)
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{
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if (!consume_specific('{'))
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return false;
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if (!consume_number(index))
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index = use_next_index;
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if (!consume_specific('}'))
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ASSERT_NOT_REACHED();
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return true;
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}
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void FormatBuilder::put_padding(char fill, size_t amount)
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{
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for (size_t i = 0; i < amount; ++i)
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m_builder.append(fill);
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}
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void FormatBuilder::put_literal(StringView value)
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{
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for (size_t i = 0; i < value.length(); ++i) {
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m_builder.append(value[i]);
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if (value[i] == '{' || value[i] == '}')
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++i;
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}
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}
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void FormatBuilder::put_string(
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StringView value,
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Align align,
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size_t min_width,
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size_t max_width,
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char fill)
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{
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const auto used_by_string = min(max_width, value.length());
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const auto used_by_padding = max(min_width, used_by_string) - used_by_string;
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if (used_by_string < value.length())
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value = value.substring_view(0, used_by_string);
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if (align == Align::Left || align == Align::Default) {
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m_builder.append(value);
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put_padding(fill, used_by_padding);
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} else if (align == Align::Center) {
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const auto used_by_left_padding = used_by_padding / 2;
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const auto used_by_right_padding = ceil_div<size_t, size_t>(used_by_padding, 2);
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put_padding(fill, used_by_left_padding);
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m_builder.append(value);
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put_padding(fill, used_by_right_padding);
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} else if (align == Align::Right) {
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put_padding(fill, used_by_padding);
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m_builder.append(value);
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}
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}
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void FormatBuilder::put_u64(
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u64 value,
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u8 base,
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bool prefix,
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bool upper_case,
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bool zero_pad,
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Align align,
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size_t min_width,
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char fill,
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SignMode sign_mode,
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bool is_negative)
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{
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if (align == Align::Default)
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align = Align::Right;
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Array<u8, 128> buffer;
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const auto used_by_digits = convert_unsigned_to_string(value, buffer, base, upper_case);
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size_t used_by_prefix = 0;
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if (align == Align::Right && zero_pad) {
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// We want String::formatted("{:#08x}", 32) to produce '0x00000020' instead of '0x000020'. This
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// behaviour differs from both fmtlib and printf, but is more intuitive.
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used_by_prefix = 0;
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} else {
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if (is_negative || sign_mode != SignMode::OnlyIfNeeded)
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used_by_prefix += 1;
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if (prefix) {
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if (base == 8)
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used_by_prefix += 1;
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else if (base == 16)
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used_by_prefix += 2;
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else if (base == 2)
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used_by_prefix += 2;
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}
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}
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const auto used_by_field = used_by_prefix + used_by_digits;
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const auto used_by_padding = max(used_by_field, min_width) - used_by_field;
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const auto put_prefix = [&]() {
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if (is_negative)
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m_builder.append('-');
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else if (sign_mode == SignMode::Always)
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m_builder.append('+');
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else if (sign_mode == SignMode::Reserved)
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m_builder.append(' ');
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if (prefix) {
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if (base == 2) {
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if (upper_case)
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m_builder.append("0B");
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else
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m_builder.append("0b");
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} else if (base == 8) {
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m_builder.append("0");
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} else if (base == 16) {
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if (upper_case)
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m_builder.append("0X");
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else
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m_builder.append("0x");
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}
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}
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};
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const auto put_digits = [&]() {
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for (size_t i = 0; i < used_by_digits; ++i)
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m_builder.append(buffer[i]);
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};
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if (align == Align::Left) {
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const auto used_by_right_padding = used_by_padding;
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put_prefix();
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put_digits();
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put_padding(fill, used_by_right_padding);
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} else if (align == Align::Center) {
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const auto used_by_left_padding = used_by_padding / 2;
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const auto used_by_right_padding = ceil_div<size_t, size_t>(used_by_padding, 2);
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put_padding(fill, used_by_left_padding);
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put_prefix();
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put_digits();
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put_padding(fill, used_by_right_padding);
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} else if (align == Align::Right) {
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const auto used_by_left_padding = used_by_padding;
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if (zero_pad) {
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put_prefix();
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put_padding('0', used_by_left_padding);
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put_digits();
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} else {
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put_padding(fill, used_by_left_padding);
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put_prefix();
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put_digits();
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}
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}
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}
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void FormatBuilder::put_i64(
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i64 value,
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u8 base,
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bool prefix,
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bool upper_case,
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bool zero_pad,
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Align align,
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size_t min_width,
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char fill,
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SignMode sign_mode)
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{
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const auto is_negative = value < 0;
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value = is_negative ? -value : value;
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put_u64(static_cast<size_t>(value), base, prefix, upper_case, zero_pad, align, min_width, fill, sign_mode, is_negative);
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}
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#ifndef KERNEL
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void FormatBuilder::put_f64(
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double value,
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u8 base,
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bool upper_case,
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Align align,
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size_t min_width,
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size_t precision,
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char fill,
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SignMode sign_mode)
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{
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StringBuilder string_builder;
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FormatBuilder format_builder { string_builder };
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format_builder.put_i64(static_cast<i64>(value), base, false, upper_case, false, Align::Right, 0, ' ', sign_mode);
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string_builder.append('.');
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if (precision > 0) {
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// FIXME: This is a terrible approximation but doing it properly would be a lot of work. If someone is up for that, a good
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// place to start would be the following video from CppCon 2019:
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// https://youtu.be/4P_kbF0EbZM (Stephan T. Lavavej “Floating-Point <charconv>: Making Your Code 10x Faster With C++17's Final Boss”)
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value -= static_cast<i64>(value);
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if (value < 0)
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value = -value;
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for (u32 i = 0; i < precision; ++i)
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value *= 10;
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format_builder.put_u64(static_cast<u64>(value), base, false, upper_case, true, Align::Right, precision);
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// FIXME: Cut off trailing zeroes by default?
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}
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put_string(string_builder.string_view(), align, min_width, NumericLimits<size_t>::max(), fill);
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}
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#endif
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void vformat(StringBuilder& builder, StringView fmtstr, TypeErasedFormatParams params)
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{
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FormatBuilder fmtbuilder { builder };
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FormatParser parser { fmtstr };
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vformat_impl(params, fmtbuilder, parser);
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}
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void vformat(const LogStream& stream, StringView fmtstr, TypeErasedFormatParams params)
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{
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StringBuilder builder;
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vformat(builder, fmtstr, params);
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stream << builder.to_string();
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}
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void StandardFormatter::parse(TypeErasedFormatParams& params, FormatParser& parser)
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{
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if (StringView { "<^>" }.contains(parser.peek(1))) {
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ASSERT(!parser.next_is(is_any_of("{}")));
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m_fill = parser.consume();
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}
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if (parser.consume_specific('<'))
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m_align = FormatBuilder::Align::Left;
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else if (parser.consume_specific('^'))
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m_align = FormatBuilder::Align::Center;
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else if (parser.consume_specific('>'))
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m_align = FormatBuilder::Align::Right;
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if (parser.consume_specific('-'))
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m_sign_mode = FormatBuilder::SignMode::OnlyIfNeeded;
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else if (parser.consume_specific('+'))
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m_sign_mode = FormatBuilder::SignMode::Always;
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else if (parser.consume_specific(' '))
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m_sign_mode = FormatBuilder::SignMode::Reserved;
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if (parser.consume_specific('#'))
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m_alternative_form = true;
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if (parser.consume_specific('0'))
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m_zero_pad = true;
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if (size_t index = 0; parser.consume_replacement_field(index)) {
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if (index == use_next_index)
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index = params.take_next_index();
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m_width = value_from_arg + index;
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} else if (size_t width = 0; parser.consume_number(width)) {
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m_width = width;
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}
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if (parser.consume_specific('.')) {
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if (size_t index = 0; parser.consume_replacement_field(index)) {
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if (index == use_next_index)
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index = params.take_next_index();
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m_precision = value_from_arg + index;
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} else if (size_t precision = 0; parser.consume_number(precision)) {
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m_precision = precision;
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}
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}
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if (parser.consume_specific('b'))
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m_mode = Mode::Binary;
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else if (parser.consume_specific('B'))
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m_mode = Mode::BinaryUppercase;
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else if (parser.consume_specific('d'))
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m_mode = Mode::Decimal;
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else if (parser.consume_specific('o'))
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m_mode = Mode::Octal;
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else if (parser.consume_specific('x'))
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m_mode = Mode::Hexadecimal;
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else if (parser.consume_specific('X'))
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m_mode = Mode::HexadecimalUppercase;
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else if (parser.consume_specific('c'))
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m_mode = Mode::Character;
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else if (parser.consume_specific('s'))
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m_mode = Mode::String;
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else if (parser.consume_specific('p'))
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m_mode = Mode::Pointer;
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else if (parser.consume_specific('f'))
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m_mode = Mode::Float;
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else if (parser.consume_specific('a'))
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m_mode = Mode::Hexfloat;
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else if (parser.consume_specific('A'))
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m_mode = Mode::HexfloatUppercase;
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if (!parser.is_eof())
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dbgln("{} did not consume '{}'", __PRETTY_FUNCTION__, parser.remaining());
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ASSERT(parser.is_eof());
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}
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void Formatter<StringView>::format(TypeErasedFormatParams& params, FormatBuilder& builder, StringView value)
|
|
{
|
|
if (m_sign_mode != FormatBuilder::SignMode::Default)
|
|
ASSERT_NOT_REACHED();
|
|
if (m_alternative_form)
|
|
ASSERT_NOT_REACHED();
|
|
if (m_zero_pad)
|
|
ASSERT_NOT_REACHED();
|
|
if (m_mode != Mode::Default && m_mode != Mode::String && m_mode != Mode::Character)
|
|
ASSERT_NOT_REACHED();
|
|
if (m_width != value_not_set && m_precision != value_not_set)
|
|
ASSERT_NOT_REACHED();
|
|
|
|
const auto width = params.decode(m_width);
|
|
const auto precision = params.decode(m_precision, NumericLimits<size_t>::max());
|
|
|
|
builder.put_string(value, m_align, width, precision, m_fill);
|
|
}
|
|
|
|
template<typename T>
|
|
void Formatter<T, typename EnableIf<IsIntegral<T>::value>::Type>::format(TypeErasedFormatParams& params, FormatBuilder& builder, T value)
|
|
{
|
|
if (m_mode == Mode::Character) {
|
|
// FIXME: We just support ASCII for now, in the future maybe unicode?
|
|
ASSERT(value >= 0 && value <= 127);
|
|
|
|
m_mode = Mode::String;
|
|
|
|
Formatter<StringView> formatter { *this };
|
|
return formatter.format(params, builder, StringView { reinterpret_cast<const char*>(&value), 1 });
|
|
}
|
|
|
|
if (m_precision != NumericLimits<size_t>::max())
|
|
ASSERT_NOT_REACHED();
|
|
|
|
if (m_mode == Mode::Pointer) {
|
|
if (m_sign_mode != FormatBuilder::SignMode::Default)
|
|
ASSERT_NOT_REACHED();
|
|
if (m_align != FormatBuilder::Align::Default)
|
|
ASSERT_NOT_REACHED();
|
|
if (m_alternative_form)
|
|
ASSERT_NOT_REACHED();
|
|
if (m_width != value_not_set)
|
|
ASSERT_NOT_REACHED();
|
|
|
|
m_mode = Mode::Hexadecimal;
|
|
m_alternative_form = true;
|
|
m_width = 2 * sizeof(void*);
|
|
m_zero_pad = true;
|
|
}
|
|
|
|
u8 base = 0;
|
|
bool upper_case = false;
|
|
if (m_mode == Mode::Binary) {
|
|
base = 2;
|
|
} else if (m_mode == Mode::BinaryUppercase) {
|
|
base = 2;
|
|
upper_case = true;
|
|
} else if (m_mode == Mode::Octal) {
|
|
base = 8;
|
|
} else if (m_mode == Mode::Decimal || m_mode == Mode::Default) {
|
|
base = 10;
|
|
} else if (m_mode == Mode::Hexadecimal) {
|
|
base = 16;
|
|
} else if (m_mode == Mode::HexadecimalUppercase) {
|
|
base = 16;
|
|
upper_case = true;
|
|
} else {
|
|
ASSERT_NOT_REACHED();
|
|
}
|
|
|
|
const auto width = params.decode(m_width);
|
|
|
|
if (IsSame<typename MakeUnsigned<T>::Type, T>::value)
|
|
builder.put_u64(value, base, m_alternative_form, upper_case, m_zero_pad, m_align, width, m_fill, m_sign_mode);
|
|
else
|
|
builder.put_i64(value, base, m_alternative_form, upper_case, m_zero_pad, m_align, width, m_fill, m_sign_mode);
|
|
}
|
|
|
|
void Formatter<char>::format(TypeErasedFormatParams& params, FormatBuilder& builder, char value)
|
|
{
|
|
if (m_mode == Mode::Binary || m_mode == Mode::BinaryUppercase || m_mode == Mode::Decimal || m_mode == Mode::Octal || m_mode == Mode::Hexadecimal || m_mode == Mode::HexadecimalUppercase) {
|
|
// Trick: signed char != char. (Sometimes weird features are actually helpful.)
|
|
Formatter<signed char> formatter { *this };
|
|
return formatter.format(params, builder, static_cast<signed char>(value));
|
|
} else {
|
|
Formatter<StringView> formatter { *this };
|
|
return formatter.format(params, builder, { &value, 1 });
|
|
}
|
|
}
|
|
void Formatter<bool>::format(TypeErasedFormatParams& params, FormatBuilder& builder, bool value)
|
|
{
|
|
if (m_mode == Mode::Binary || m_mode == Mode::BinaryUppercase || m_mode == Mode::Decimal || m_mode == Mode::Octal || m_mode == Mode::Hexadecimal || m_mode == Mode::HexadecimalUppercase) {
|
|
Formatter<u8> formatter { *this };
|
|
return formatter.format(params, builder, static_cast<u8>(value));
|
|
} else {
|
|
Formatter<StringView> formatter { *this };
|
|
return formatter.format(params, builder, value ? "true" : "false");
|
|
}
|
|
}
|
|
#ifndef KERNEL
|
|
void Formatter<double>::format(TypeErasedFormatParams& params, FormatBuilder& builder, double value)
|
|
{
|
|
u8 base;
|
|
bool upper_case;
|
|
if (m_mode == Mode::Default || m_mode == Mode::Float) {
|
|
base = 10;
|
|
upper_case = false;
|
|
} else if (m_mode == Mode::Hexfloat) {
|
|
base = 16;
|
|
upper_case = false;
|
|
} else if (m_mode == Mode::HexfloatUppercase) {
|
|
base = 16;
|
|
upper_case = true;
|
|
} else {
|
|
ASSERT_NOT_REACHED();
|
|
}
|
|
|
|
const auto width = params.decode(m_width);
|
|
const auto precision = params.decode(m_precision, 6);
|
|
|
|
builder.put_f64(value, base, upper_case, m_align, width, precision, m_fill, m_sign_mode);
|
|
}
|
|
void Formatter<float>::format(TypeErasedFormatParams& params, FormatBuilder& builder, float value)
|
|
{
|
|
Formatter<double> formatter { *this };
|
|
formatter.format(params, builder, value);
|
|
}
|
|
#endif
|
|
|
|
#ifndef KERNEL
|
|
void vout(FILE* file, StringView fmtstr, TypeErasedFormatParams params, bool newline)
|
|
{
|
|
StringBuilder builder;
|
|
vformat(builder, fmtstr, params);
|
|
|
|
if (newline)
|
|
builder.append('\n');
|
|
|
|
const auto string = builder.string_view();
|
|
const auto retval = ::fwrite(string.characters_without_null_termination(), 1, string.length(), file);
|
|
ASSERT(static_cast<size_t>(retval) == string.length());
|
|
}
|
|
#endif
|
|
|
|
void vdbgln(StringView fmtstr, TypeErasedFormatParams params)
|
|
{
|
|
StringBuilder builder;
|
|
|
|
// FIXME: This logic is redundant with the stuff in LogStream.cpp.
|
|
#if defined(__serenity__)
|
|
# ifdef KERNEL
|
|
if (Kernel::Processor::is_initialized() && Kernel::Thread::current()) {
|
|
auto& thread = *Kernel::Thread::current();
|
|
builder.appendff("\033[34;1m[{}({}:{})]\033[0m: ", thread.process().name(), thread.pid().value(), thread.tid().value());
|
|
} else {
|
|
builder.appendff("\033[34;1m[Kernel]\033[0m: ");
|
|
}
|
|
# else
|
|
static TriState got_process_name = TriState::Unknown;
|
|
static char process_name_buffer[256];
|
|
|
|
if (got_process_name == TriState::Unknown) {
|
|
if (get_process_name(process_name_buffer, sizeof(process_name_buffer)) == 0)
|
|
got_process_name = TriState::True;
|
|
else
|
|
got_process_name = TriState::False;
|
|
}
|
|
if (got_process_name == TriState::True)
|
|
builder.appendff("\033[33;1m{}({})\033[0m: ", process_name_buffer, getpid());
|
|
# endif
|
|
#endif
|
|
|
|
vformat(builder, fmtstr, params);
|
|
builder.append('\n');
|
|
|
|
const auto string = builder.string_view();
|
|
|
|
const auto retval = dbgputstr(string.characters_without_null_termination(), string.length());
|
|
ASSERT(retval == 0);
|
|
}
|
|
|
|
template struct Formatter<unsigned char, void>;
|
|
template struct Formatter<unsigned short, void>;
|
|
template struct Formatter<unsigned int, void>;
|
|
template struct Formatter<unsigned long, void>;
|
|
template struct Formatter<unsigned long long, void>;
|
|
template struct Formatter<short, void>;
|
|
template struct Formatter<int, void>;
|
|
template struct Formatter<long, void>;
|
|
template struct Formatter<long long, void>;
|
|
template struct Formatter<signed char, void>;
|
|
|
|
} // namespace AK
|