mirror of
https://github.com/SerenityOS/serenity
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122 lines
3.9 KiB
C++
122 lines
3.9 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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#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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public:
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using MappingType = HashMap<StringView, String>;
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explicit SourceGenerator(SourceGenerator& parent, char opening = '@', char closing = '@')
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: m_parent(&parent)
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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(char opening = '@', char closing = '@')
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: m_parent(nullptr)
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, m_opening(opening)
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, m_closing(closing)
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{
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m_builder = new StringBuilder();
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}
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void set(StringView key, String value) { m_mapping.set(key, value); }
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String lookup(StringView key) const
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{
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if (auto opt = m_mapping.get(key); opt.has_value())
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return opt.value();
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if (m_parent == nullptr) {
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dbgln("Can't find key '{}'", key);
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ASSERT_NOT_REACHED();
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}
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return m_parent->lookup(key);
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}
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String generate() const { return builder().build(); }
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StringBuilder& builder()
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{
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if (m_parent)
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return m_parent->builder();
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else
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return *m_builder;
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}
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const StringBuilder& builder() const
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{
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if (m_parent)
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return m_parent->builder();
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else
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return *m_builder;
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}
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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 inconvinient, 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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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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ASSERT_NOT_REACHED();
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builder().append(lookup(placeholder));
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} else {
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ASSERT(lexer.is_eof());
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}
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}
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}
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private:
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SourceGenerator* m_parent;
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MappingType m_mapping;
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OwnPtr<StringBuilder> m_builder;
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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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