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