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/*
* Copyright (c) 2020, the SerenityOS developers.
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/GenericLexer.h>
#include <AK/HashMap.h>
#include <AK/String.h>
#include <AK/StringBuilder.h>
namespace AK {
class SourceGenerator {
AK_MAKE_NONCOPYABLE(SourceGenerator);
public:
using MappingType = HashMap<StringView, String>;
explicit SourceGenerator(StringBuilder& builder, char opening = '@', char closing = '@')
: m_builder(builder)
, m_opening(opening)
, m_closing(closing)
{
}
explicit SourceGenerator(StringBuilder& builder, const MappingType& mapping, char opening = '@', char closing = '@')
: m_builder(builder)
, m_mapping(mapping)
, m_opening(opening)
, m_closing(closing)
{
}
SourceGenerator(SourceGenerator&&) = default;
SourceGenerator fork() { return SourceGenerator { m_builder, m_mapping, m_opening, m_closing }; }
void set(StringView key, String value) { m_mapping.set(key, value); }
String get(StringView key) const
{
auto result = m_mapping.get(key);
if (!result.has_value()) {
warnln("No key named `{}` set on SourceGenerator", key);
VERIFY_NOT_REACHED();
}
return result.release_value();
}
StringView as_string_view() const { return m_builder.string_view(); }
String as_string() const { return m_builder.build(); }
void append(StringView pattern)
{
GenericLexer lexer { pattern };
while (!lexer.is_eof()) {
// FIXME: It is a bit inconvenient, that 'consume_until' also consumes the 'stop' character, this makes
// the method less generic because there is no way to check if the 'stop' character ever appeared.
const auto consume_until_without_consuming_stop_character = [&](char stop) {
return lexer.consume_while([&](char ch) { return ch != stop; });
};
m_builder.append(consume_until_without_consuming_stop_character(m_opening));
if (lexer.consume_specific(m_opening)) {
const auto placeholder = consume_until_without_consuming_stop_character(m_closing);
if (!lexer.consume_specific(m_closing))
VERIFY_NOT_REACHED();
m_builder.append(get(placeholder));
} else {
VERIFY(lexer.is_eof());
}
}
}
private:
StringBuilder& m_builder;
MappingType m_mapping;
char m_opening, m_closing;
};
}
using AK::SourceGenerator;
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