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/*
* Copyright (c) 2020, the SerenityOS developers.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <AK/Format.h>
#include <AK/GenericLexer.h>
#include <AK/PrintfImplementation.h>
#include <AK/String.h>
#include <AK/StringBuilder.h>
namespace {
struct FormatSpecifier {
StringView flags;
size_t index { 0 };
};
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;
}
}
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;
}
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;
}
}
static size_t parse_number(StringView input)
{
size_t value = 0;
for (char ch : input) {
value *= 10;
value += ch - '0';
}
return value;
}
static bool parse_format_specifier(StringView input, FormatSpecifier& specifier)
{
specifier.index = NumericLimits<size_t>::max();
GenericLexer lexer { input };
auto index = lexer.consume_while([](char ch) { return StringView { "0123456789" }.contains(ch); });
if (index.length() > 0)
specifier.index = parse_number(index);
if (!lexer.consume_specific(':'))
return lexer.is_eof();
specifier.flags = lexer.consume_all();
return true;
}
} // namespace
namespace AK {
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, '}'))
ASSERT_NOT_REACHED();
write_escaped_literal(builder, fmtstr);
return;
}
write_escaped_literal(builder, fmtstr.substring_view(0, opening));
size_t closing;
if (!find_next(closing, fmtstr.substring_view(opening), '}'))
ASSERT_NOT_REACHED();
closing += opening;
FormatSpecifier specifier;
if (!parse_format_specifier(fmtstr.substring_view(opening + 1, closing - (opening + 1)), specifier))
ASSERT_NOT_REACHED();
if (specifier.index == NumericLimits<size_t>::max())
specifier.index = argument_index++;
if (specifier.index >= parameters.size())
ASSERT_NOT_REACHED();
auto& parameter = parameters[specifier.index];
if (!parameter.formatter(builder, parameter.value, specifier.flags))
ASSERT_NOT_REACHED();
vformat(builder, fmtstr.substring_view(closing + 1), parameters, argument_index);
}
void vformat(const LogStream& stream, StringView fmtstr, Span<const TypeErasedParameter> parameters)
{
StringBuilder builder;
vformat(builder, fmtstr, parameters);
stream << builder.to_string();
}
bool Formatter<StringView>::parse(StringView flags)
{
return flags.is_empty();
}
void Formatter<StringView>::format(StringBuilder& builder, StringView value)
{
builder.append(value);
}
template<typename T>
bool Formatter<T, typename EnableIf<IsIntegral<T>::value>::Type>::parse(StringView flags)
{
GenericLexer lexer { flags };
if (lexer.consume_specific('0'))
zero_pad = true;
auto field_width = lexer.consume_while([](char ch) { return StringView { "0123456789" }.contains(ch); });
if (field_width.length() > 0)
this->field_width = parse_number(field_width);
if (lexer.consume_specific('x'))
hexadecimal = true;
return lexer.is_eof();
}
template<typename T>
void Formatter<T, typename EnableIf<IsIntegral<T>::value>::Type>::format(StringBuilder& builder, T value)
{
char* bufptr;
if (hexadecimal)
PrintfImplementation::print_hex([&](auto, char ch) { builder.append(ch); }, bufptr, value, false, false, false, zero_pad, field_width);
else if (IsSame<typename MakeUnsigned<T>::Type, T>::value)
PrintfImplementation::print_u64([&](auto, char ch) { builder.append(ch); }, bufptr, value, false, zero_pad, field_width);
else
PrintfImplementation::print_i64([&](auto, char ch) { builder.append(ch); }, bufptr, value, false, zero_pad, field_width);
}
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<char, 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
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