/*

 * Copyright (c) 2020, Stephan Unverwerth <s.unverwerth@serenityos.org>

 * Copyright (c) 2021-2022, David Tuin <davidot@serenityos.org>

 *

 * SPDX-License-Identifier: BSD-2-Clause

 */

#include <AK/StringView.h>

#include <AK/Vector.h>

#include <LibJS/ParserError.h>

#include <LibJS/Token.h>

namespace JS {

String ParserError::to_string() const

{

    if (!position.has_value())

        return MUST(String::from_byte_string(message));

    return MUST(String::formatted("{} (line: {}, column: {})", message, position.value().line, position.value().column));

}

ByteString ParserError::to_byte_string() const

{

    if (!position.has_value())

        return message;

    return ByteString::formatted("{} (line: {}, column: {})", message, position.value().line, position.value().column);

}

ByteString ParserError::source_location_hint(StringView source, char const spacer, char const indicator) const

{

    if (!position.has_value())

        return {};

    // We need to modify the source to match what the lexer considers one line - normalizing

    // line terminators to \n is easier than splitting using all different LT characters.

    ByteString source_string = source.replace("\r\n"sv, "\n"sv, ReplaceMode::All).replace("\r"sv, "\n"sv, ReplaceMode::All).replace(LINE_SEPARATOR_STRING, "\n"sv, ReplaceMode::All).replace(PARAGRAPH_SEPARATOR_STRING, "\n"sv, ReplaceMode::All);

    StringBuilder builder;

    builder.append(source_string.split_view('\n', SplitBehavior::KeepEmpty)[position.value().line - 1]);

    builder.append('\n');

    for (size_t i = 0; i < position.value().column - 1; ++i)

        builder.append(spacer);

    builder.append(indicator);

    return builder.to_byte_string();

}

}