// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0

#include "ldparser.h"
#include "projectexplorerconstants.h"

#include <utils/algorithm.h>
#include <utils/qtcassert.h>

using namespace ProjectExplorer;

namespace {
    // opt. drive letter + filename: (2 brackets)
    const char * const FILE_PATTERN = "(([A-Za-z]:)?[^:]+\\.[^:]+):";
    // line no. or elf segment + offset (1 bracket)
    const char * const POSITION_PATTERN = "(\\S+|\\(\\..+?[+-]0x[a-fA-F0-9]+\\)):";
    const char * const COMMAND_PATTERN = "^(.*[\\\\/])?([a-z0-9]+-[a-z0-9]+-[a-z0-9]+-)?(ld|gold)(-[0-9\\.]+)?(\\.exe)?: ";
    const char *const RANLIB_PATTERN = "ranlib(.exe)?: (file: (.*) has no symbols)$";
}

LdParser::LdParser()
{
    setObjectName(QLatin1String("LdParser"));
    m_ranlib.setPattern(QLatin1String(RANLIB_PATTERN));
    QTC_CHECK(m_ranlib.isValid());
    m_regExpLinker.setPattern(QLatin1Char('^') +
                              QString::fromLatin1(FILE_PATTERN) + QLatin1Char('(') +
                              QString::fromLatin1(FILE_PATTERN) + QLatin1String(")?(") +
                              QLatin1String(POSITION_PATTERN) + QLatin1String(")?\\s(.+)$"));
    QTC_CHECK(m_regExpLinker.isValid());

    m_regExpGccNames.setPattern(QLatin1String(COMMAND_PATTERN));
    QTC_CHECK(m_regExpGccNames.isValid());
}

Utils::OutputLineParser::Result LdParser::handleLine(const QString &line, Utils::OutputFormat type)
{
    if (type != Utils::StdErrFormat)
        return Status::NotHandled;

    QString lne = rightTrimmed(line);
    if (!lne.isEmpty() && !lne.at(0).isSpace() && !m_incompleteTask.isNull()) {
        flush();
        return Status::NotHandled;
    }

    if (lne.startsWith(QLatin1String("TeamBuilder "))
            || lne.startsWith(QLatin1String("distcc["))
            || lne.contains(QLatin1String("ar: creating "))) {
        return Status::NotHandled;
    }

    // ld on macOS
    if (lne.startsWith("Undefined symbols for architecture") && lne.endsWith(":")) {
        m_incompleteTask = CompileTask(Task::Error, lne);
        return Status::InProgress;
    }
    if (!m_incompleteTask.isNull() && lne.startsWith("  ")) {
        m_incompleteTask.details.append(lne);
        static const QRegularExpression locRegExp("    (?<symbol>\\S+) in (?<file>\\S+)");
        const QRegularExpressionMatch match = locRegExp.match(lne);
        LinkSpecs linkSpecs;
        if (match.hasMatch()) {
            m_incompleteTask.setFile(absoluteFilePath(Utils::FilePath::fromString(
                                                          match.captured("file"))));
            addLinkSpecForAbsoluteFilePath(linkSpecs, m_incompleteTask.file, 0, match, "file");
        }
        return {Status::InProgress, linkSpecs};
    }

    if (lne.startsWith("collect2:") || lne.startsWith("collect2.exe:")) {
        scheduleTask(CompileTask(Task::Error, lne /* description */), 1);
        return Status::Done;
    }

    QRegularExpressionMatch match = m_ranlib.match(lne);
    if (match.hasMatch()) {
        QString description = match.captured(2);
        scheduleTask(CompileTask(Task::Warning, description), 1);
        return Status::Done;
    }

    match = m_regExpGccNames.match(lne);
    if (match.hasMatch()) {
        QString description = lne.mid(match.capturedLength());
        Task::TaskType type = Task::Error;
        if (description.startsWith(QLatin1String("warning: "))) {
            type = Task::Warning;
            description = description.mid(9);
        } else if (description.startsWith(QLatin1String("fatal: ")))  {
            description = description.mid(7);
        }
        scheduleTask(CompileTask(type, description), 1);
        return Status::Done;
    }

    match = m_regExpLinker.match(lne);
    if (match.hasMatch() && lne.count(':') >= 2) {
        bool ok;
        int lineno = match.captured(7).toInt(&ok);
        if (!ok)
            lineno = -1;
        Utils::FilePath filename
                = absoluteFilePath(Utils::FilePath::fromUserInput(match.captured(1)));
        int capIndex = 1;
        const QString sourceFileName = match.captured(4);
        if (!sourceFileName.isEmpty()
            && !sourceFileName.startsWith(QLatin1String("(.text"))
            && !sourceFileName.startsWith(QLatin1String("(.data"))) {
            filename = absoluteFilePath(Utils::FilePath::fromUserInput(sourceFileName));
            capIndex = 4;
        }
        QString description = match.captured(8).trimmed();
        Task::TaskType type = Task::Error;
        if (description.startsWith(QLatin1String("first defined here")) ||
            description.startsWith(QLatin1String("note:"), Qt::CaseInsensitive)) {
            type = Task::Unknown;
        } else if (description.startsWith(QLatin1String("warning: "), Qt::CaseInsensitive)) {
            type = Task::Warning;
            description = description.mid(9);
        }
        static const QStringList keywords{
            "File format not recognized",
            "undefined reference",
            "first defined here",
            "feupdateenv is not implemented and will always fail", // yes, this is quite special ...
        };
        const auto descriptionContainsKeyword = [&description](const QString &keyword) {
            return description.contains(keyword);
        };
        if (Utils::anyOf(keywords, descriptionContainsKeyword)) {
            LinkSpecs linkSpecs;
            addLinkSpecForAbsoluteFilePath(linkSpecs, filename, lineno, match, capIndex);
            scheduleTask(CompileTask(type, description, filename, lineno), 1);
            return {Status::Done, linkSpecs};
        }
    }

    return Status::NotHandled;
}

void LdParser::flush()
{
    if (m_incompleteTask.isNull())
        return;
    const Task t = m_incompleteTask;
    m_incompleteTask.clear();
    scheduleTask(t, 1);
}