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/*
* Copyright (c) 2020-2022, the SerenityOS developers.
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/DeprecatedString.h>
#include <AK/GenericLexer.h>
#include <AK/OwnPtr.h>
#include <AK/Stream.h>
#include <AK/StringView.h>
#include <AK/Types.h>
#include <AK/Vector.h>
namespace Writer {
enum class WriterBehavior : u32 {
None = 0,
WriteHeaders = 1,
AllowNewlinesInFields = WriteHeaders << 1,
QuoteOnlyInFieldStart = WriteHeaders << 2,
QuoteAll = WriteHeaders << 3,
};
AK_ENUM_BITWISE_OPERATORS(WriterBehavior);
struct WriterTraits {
DeprecatedString separator;
DeprecatedString quote { "\"" };
enum QuoteEscape {
Repeat,
Backslash,
} quote_escape { Repeat };
};
constexpr WriterBehavior default_behaviors()
{
return WriterBehavior::None;
}
template<typename ContainerType, typename HeaderType = Vector<StringView>>
class XSV {
public:
static ErrorOr<void> generate(AK::Stream& output, ContainerType const& data, WriterTraits traits, HeaderType headers = {}, WriterBehavior behaviors = default_behaviors())
{
auto writer = XSV(output, data, traits, headers, behaviors);
auto with_headers = has_flag(writer.m_behaviors, WriterBehavior::WriteHeaders);
if (with_headers) {
TRY(writer.write_row(writer.m_names));
TRY(writer.m_output.write_entire_buffer({ "\n", 1 }));
}
for (auto&& row : writer.m_data) {
if (with_headers) {
if (row.size() != writer.m_names.size())
return Error::from_string_literal("Header count does not match given column count");
}
TRY(writer.write_row(row));
TRY(writer.m_output.write_entire_buffer({ "\n", 1 }));
}
return {};
}
static ErrorOr<void> generate_preview(AK::Stream& output, ContainerType const& data, WriterTraits traits, HeaderType headers = {}, WriterBehavior behaviors = default_behaviors())
{
auto writer = XSV(output, data, traits, headers, behaviors);
auto lines_written = 0;
constexpr auto max_preview_lines = 8;
auto with_headers = has_flag(writer.m_behaviors, WriterBehavior::WriteHeaders);
if (with_headers) {
TRY(writer.write_row(writer.m_names));
TRY(writer.m_output.write_entire_buffer({ "\n", 1 }));
++lines_written;
}
for (auto&& row : writer.m_data) {
if (with_headers) {
if (row.size() != writer.m_names.size())
return Error::from_string_literal("Header count does not match given column count");
}
TRY(writer.write_row(row));
TRY(writer.m_output.write_entire_buffer({ "\n", 1 }));
++lines_written;
if (lines_written >= max_preview_lines)
break;
}
return {};
}
private:
XSV(AK::Stream& output, ContainerType const& data, WriterTraits traits, HeaderType headers = {}, WriterBehavior behaviors = default_behaviors())
: m_data(data)
, m_traits(move(traits))
, m_behaviors(behaviors)
, m_names(headers)
, m_output(output)
{
if (!headers.is_empty())
m_behaviors = m_behaviors | WriterBehavior::WriteHeaders;
}
template<typename T>
ErrorOr<void> write_row(T&& row)
{
bool first = true;
for (auto&& entry : row) {
if (!first) {
TRY(m_output.write_entire_buffer(m_traits.separator.bytes()));
}
first = false;
TRY(write_entry(entry));
}
return {};
}
template<typename T>
ErrorOr<void> write_entry(T&& entry)
{
auto string = DeprecatedString::formatted("{}", FormatIfSupported(entry));
auto safe_to_write_normally = !has_flag(m_behaviors, WriterBehavior::QuoteAll)
&& !string.contains('\n')
&& !string.contains(m_traits.separator);
if (safe_to_write_normally) {
if (has_flag(m_behaviors, WriterBehavior::QuoteOnlyInFieldStart))
safe_to_write_normally = !string.starts_with(m_traits.quote);
else
safe_to_write_normally = !string.contains(m_traits.quote);
}
if (safe_to_write_normally) {
if (!string.is_empty())
TRY(m_output.write_entire_buffer(string.bytes()));
return {};
}
TRY(m_output.write_entire_buffer(m_traits.quote.bytes()));
GenericLexer lexer(string);
while (!lexer.is_eof()) {
if (lexer.consume_specific(m_traits.quote)) {
switch (m_traits.quote_escape) {
case WriterTraits::Repeat:
TRY(m_output.write_entire_buffer(m_traits.quote.bytes()));
TRY(m_output.write_entire_buffer(m_traits.quote.bytes()));
break;
case WriterTraits::Backslash:
TRY(m_output.write_entire_buffer({ "\\", 1 }));
TRY(m_output.write_entire_buffer(m_traits.quote.bytes()));
break;
}
continue;
}
auto ch = lexer.consume();
TRY(m_output.write_entire_buffer({ &ch, 1 }));
}
TRY(m_output.write_entire_buffer(m_traits.quote.bytes()));
return {};
}
ContainerType const& m_data;
WriterTraits m_traits;
WriterBehavior m_behaviors;
HeaderType m_names;
AK::Stream& m_output;
};
}
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