/*  -*- c++ -*-
    tests/lexertest.cpp

    This file is part of the testsuite of KSieve,
    the KDE internet mail/usenet news message filtering library.
    Copyright (c) 2003 Marc Mutz <mutz@kde.org>

    KSieve is free software; you can redistribute it and/or modify it
    under the terms of the GNU General Public License, version 2, as
    published by the Free Software Foundation.

    KSieve is distributed in the hope that it will be useful, but
    WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA

    In addition, as a special exception, the copyright holders give
    permission to link the code of this program with any edition of
    the Qt library by Trolltech AS, Norway (or with modified versions
    of Qt that use the same license as Qt), and distribute linked
    combinations including the two.  You must obey the GNU General
    Public License in all respects for all of the code used other than
    Qt.  If you modify this file, you may extend this exception to
    your version of the file, but you are not obligated to do so.  If
    you do not wish to do so, delete this exception statement from
    your version.
*/
#include <ksieve/lexer.h>
using KSieve::Lexer;

#include <ksieve/error.h>
using KSieve::Error;

#include <QString>

#include <iostream>
#include <cstdlib>

using std::cout;
using std::cerr;
using std::endl;

static const char *token2string(Lexer::Token t)
{
    switch (t) {
#define CASE(x) case Lexer::x: \
    return #x
        CASE(None);
        CASE(HashComment);
        CASE(BracketComment);
        CASE(Identifier);
        CASE(Tag);
        CASE(Number);
        CASE(MultiLineString);
        CASE(QuotedString);
        CASE(Special);
        CASE(LineFeeds);
    }
    return "";
#undef CASE
}

struct TestCase {
    const char *name;
    const char *string;
    struct {
        Lexer::Token token;
        const char *result;
    } expected[16]; // end with { None, 0 }
    Error::Type expectedError;
    int errorLine, errorCol;
};

static const TestCase testcases[] = {
    //
    // Whitespace:
    //

    {
        "Null script", nullptr,
        { { Lexer::None, nullptr } },
        Error::None, 0, 0
    },

    {
        "Empty script", "",
        { { Lexer::None, nullptr } },
        Error::None, 0, 0
    },

    {
        "Whitespace-only script", " \t\n\t \n",
        { { Lexer::LineFeeds, "2" }, { Lexer::None, nullptr } },
        Error::None, 0, 0
    },

    {
        "Lone CR", "\r",
        { { Lexer::None, nullptr } },
        Error::CRWithoutLF, 0, 1
    },

    {
        "CR+Space", "\r ",
        { { Lexer::None, nullptr } },
        Error::CRWithoutLF, 0, 1
    },

    {
        "CRLF alone", "\r\n",
        { { Lexer::LineFeeds, "1" }, { Lexer::None, nullptr } },
        Error::None, 0, 0
    },

    //
    // hash comments:
    //

    {
        "Basic hash comment (no newline)", "#comment",
        { { Lexer::HashComment, "comment" }, { Lexer::None, nullptr } },
        Error::None, 0, 0
    },

    {
        "Basic hash comment (LF)", "#comment\n",
        { { Lexer::HashComment, "comment" }, { Lexer::None, nullptr } },
        Error::None, 0, 0
    },

    {
        "Basic hash comment (CRLF)", "#comment\r\n",
        { { Lexer::HashComment, "comment" }, { Lexer::None, nullptr } },
        Error::None, 0, 0
    },

    {
        "Basic hash comment (CR)", "#comment\r",
        { { Lexer::HashComment, nullptr } },
        Error::CRWithoutLF, 0, 9
    },

    {
        "Non-UTF-8 in hash comment", "#\xA9 copyright",
        { { Lexer::HashComment, nullptr } },
        Error::InvalidUTF8, 0, 12
    },

    //
    // bracket comments:
    //

    {
        "Basic bracket comment", "/* comment */",
        { { Lexer::BracketComment, " comment " }, { Lexer::None, nullptr } },
        Error::None, 0, 0
    },

    {
        "Basic bracket comment - missing trailing slash", "/* comment *",
        { { Lexer::BracketComment, nullptr } },
        Error::UnfinishedBracketComment, 0, 0
    },

    {
        "Basic bracket comment - missing trailing asterisk + slash", "/* comment ",
        { { Lexer::BracketComment, nullptr } },
        Error::UnfinishedBracketComment, 0, 0
    },

    {
        "Basic bracket comment - missing leading slash", "* comment */",
        { { Lexer::None, nullptr } },
        Error::IllegalCharacter, 0, 0
    },

    {
        "Basic bracket comment - missing leading asterisk + slash", "comment */",
        { { Lexer::Identifier, "comment" }, { Lexer::None, nullptr } },
        Error::IllegalCharacter, 0, 8
    },

    {
        "Basic multiline bracket comment (LF)", "/* comment\ncomment */",
        { { Lexer::BracketComment, " comment\ncomment " }, { Lexer::None, nullptr } },
        Error::None, 0, 0
    },

    {
        "Basic multiline bracket comment (CRLF)", "/* comment\r\ncomment */",
        { { Lexer::BracketComment, " comment\ncomment " }, { Lexer::None, nullptr } },
        Error::None, 0, 0
    },

    {
        "Basic multiline bracket comment (CR)", "/* comment\rcomment */",
        { { Lexer::BracketComment, nullptr } },
        Error::CRWithoutLF, 0, 11
    },

    {
        "Non-UTF-8 in bracket comment", "/*\xA9 copyright*/",
        { { Lexer::BracketComment, nullptr } },
        Error::InvalidUTF8, 0, 14
    },

    //
    // numbers:
    //
    {
        "Basic number 1", "1",
        { { Lexer::Number, "1" }, { Lexer::None, nullptr } },
        Error::None, 0, 0
    },
    {
        "Basic number 01", "01",
        { { Lexer::Number, "01" }, { Lexer::None, nullptr } },
        Error::None, 0, 0
    },
    {
        "Qualified number 1k", "1k",
        { { Lexer::Number, "1k" }, { Lexer::None, nullptr } },
        Error::None, 0, 0
    },
    {
        "Qualified number 1M", "1M",
        { { Lexer::Number, "1M" }, { Lexer::None, nullptr } },
        Error::None, 0, 0
    },
    {
        "Qualified number 1G", "1G",
        { { Lexer::Number, "1G" }, { Lexer::None, nullptr } },
        Error::None, 0, 0
    },
    //
    // identifiers:
    //
    {
        "Basic identifier \"id\"", "id",
        { { Lexer::Identifier, "id" }, { Lexer::None, nullptr } },
        Error::None, 0, 0
    },
    {
        "Basic identifier \"_id\"", "_id",
        { { Lexer::Identifier, "_id" }, { Lexer::None, nullptr } },
        Error::None, 0, 0
    },
    //
    // tags:
    //
    {
        "Basic tag \":tag\"", ":tag",
        { { Lexer::Tag, "tag" }, { Lexer::None, nullptr } },
        Error::None, 0, 0
    },
    {
        "Basic tag \":_tag\"", ":_tag",
        { { Lexer::Tag, "_tag" }, { Lexer::None, nullptr } },
        Error::None, 0, 0
    },
    //
    // specials:
    //
    {
        "Basic special \"{}[]();,\"", "{}[]();,",
        {   { Lexer::Special, "{" }, { Lexer::Special, "}" },
            { Lexer::Special, "[" }, { Lexer::Special, "]" },
            { Lexer::Special, "(" }, { Lexer::Special, ")" },
            { Lexer::Special, ";" }, { Lexer::Special, "," }, { Lexer::None, nullptr }},
        Error::None, 0, 0
    },
    //
    // quoted-string:
    //
    {
        "Basic quoted string \"foo\"", "\"foo\"",
        { { Lexer::QuotedString, "foo" }, { Lexer::None, nullptr } },
        Error::None, 0, 0
    },
    {
        "Basic quoted string, UTF-8", "\"foo\xC3\xB1" "foo\"", // fooäfoo
        { { Lexer::QuotedString, "foo\xC3\xB1" "foo" }, { Lexer::None, nullptr } },
        Error::None, 0, 0
    },
    {
        "Quoted string, escaped '\"'", "\"foo\\\"bar\"",
        { { Lexer::QuotedString, "foo\"bar" }, { Lexer::None, nullptr } },
        Error::None, 0, 0
    },
    {
        "Quoted string, escaped '\\'", "\"foo\\\\bar\"",
        { { Lexer::QuotedString, "foo\\bar" }, { Lexer::None, nullptr } },
        Error::None, 0, 0
    },
    {
        "Quoted string, excessive escapes", "\"\\fo\\o\"",
        { { Lexer::QuotedString, "foo" }, { Lexer::None, nullptr } },
        Error::None, 0, 0
    },
    {
        "Quoted string across lines (LF)", "\"foo\nbar\"",
        { { Lexer::QuotedString, "foo\nbar" }, { Lexer::None, nullptr } },
        Error::None, 0, 0
    },
    {
        "Quoted string across lines (CRLF)", "\"foo\r\nbar\"",
        { { Lexer::QuotedString, "foo\nbar" }, { Lexer::None, nullptr } },
        Error::None, 0, 0
    },
    //
    // multiline strings:
    //
    {
        "Basic multiline string I (LF)", "text:\nfoo\n.",
        { { Lexer::MultiLineString, "foo" /* "foo\n" ? */ }, { Lexer::None, nullptr } },
        Error::None, 0, 0
    },
    {
        "Basic multiline string I (CRLF)", "text:\r\nfoo\r\n.",
        { { Lexer::MultiLineString, "foo" /* "foo\n" ? */ }, { Lexer::None, nullptr } },
        Error::None, 0, 0
    },
    {
        "Basic multiline string II (LF)", "text:\nfoo\n.\n",
        { { Lexer::MultiLineString, "foo" /* "foo\n" ? */ }, { Lexer::None, nullptr } },
        Error::None, 0, 0
    },
    {
        "Basic multiline string II (CRLF)", "text:\r\nfoo\r\n.\r\n",
        { { Lexer::MultiLineString, "foo" /* "foo\n" ? */ }, { Lexer::None, nullptr } },
        Error::None, 0, 0
    },
    {
        "Dotstuffed multiline string (LF)", "text:\n..foo\n.",
        { { Lexer::MultiLineString, ".foo" /* ".foo\n" ? */ }, { Lexer::None, nullptr } },
        Error::None, 0, 0
    },
    {
        "Dotstuffed multiline string (CRLF)", "text:\r\n..foo\r\n.",
        { { Lexer::MultiLineString, ".foo" /* ".foo\n" ? */ }, { Lexer::None, nullptr } },
        Error::None, 0, 0
    },
    {
        "Incompletely dotstuffed multiline string (LF)", "text:\n.foo\n.",
        { { Lexer::MultiLineString, ".foo" /* ".foo\n" ? */ }, { Lexer::None, nullptr } },
        Error::None, 0, 0
    },
    {
        "Incompletely dotstuffed multiline string (CRLF)", "text:\r\n.foo\r\n.",
        { { Lexer::MultiLineString, ".foo" /* ".foo\n" ? */ }, { Lexer::None, nullptr } },
        Error::None, 0, 0
    },
    {
        "Multiline with a line with only one '.'", "text:\r\nfoo\r\n..\r\nbar\r\n.",
        { { Lexer::MultiLineString, "foo\n.\nbar" }, { Lexer::None, nullptr } },
        Error::None, 0, 0
    },

    //
    // Errors in single tokens:
    //

    //
    // numbers:
    //
    {
        "Number, unknown qualifier", "100f",
        { { Lexer::Number, "100" } },
        Error::UnexpectedCharacter, 0, 3
    },
    {
        "Negative number", "-100",
        { { Lexer::None, nullptr } },
        Error::IllegalCharacter, 0, 0
    },
    //
    // identifiers:
    //
    {
        "Identifier, leading digits", "0id",
        { { Lexer::Number, "0" } },
        Error::UnexpectedCharacter, 0, 1
    },
    {
        "Identifier, embedded umlaut", "idäid",
        { { Lexer::Identifier, "id" } },
        Error::IllegalCharacter, 0, 2
    },
    //
    // tags:
    //
    {
        "Lone ':' (at end)", ":",
        { { Lexer::Tag, nullptr } },
        Error::UnexpectedCharacter, 0, 0
    },
    {
        "Lone ':' (in stream)", ": ",
        { { Lexer::Tag, nullptr } },
        Error::UnexpectedCharacter, 0, 1
    },
    {
        "Tag, leading digits", ":0tag",
        { { Lexer::Tag, nullptr } },
        Error::NoLeadingDigits, 0, 1
    },
    {
        "Tag, embedded umlaut", ":tagätag",
        { { Lexer::Tag, "tag" } },
        Error::IllegalCharacter, 0, 4
    },
    //
    // specials: (none)
    // quoted string:
    //
    {
        "Premature end of quoted string", "\"foo",
        { { Lexer::QuotedString, "foo" } },
        Error::PrematureEndOfQuotedString, 0, 0
    },
    {
        "Invalid UTF-8 in quoted string", "\"foo\xC0\xA0" "foo\"",
        { { Lexer::QuotedString, "foo" } },
        Error::InvalidUTF8, 0, 4
    },

    //
    // Whitespace / token separation: valid
    //

    {
        "Two identifiers with linebreaks", "foo\nbar\n",
        {   { Lexer::Identifier, "foo" },
            { Lexer::LineFeeds, "1" },
            { Lexer::Identifier, "bar" },
            { Lexer::LineFeeds, "1" },
            { Lexer::None, nullptr }},
        Error::None, 0, 0
    },

    //
    // Whitespace / token separation: invalid
    //
};

static const int numTestCases = sizeof testcases / sizeof *testcases;

int main(int argc, char *argv[])
{
    if (argc == 2) {   // manual test
        const char *scursor = argv[1];
        const char *const send = argv[1] + qstrlen(argv[1]);

        Lexer lexer(scursor, send);

        cout << "Begin" << endl;
        while (!lexer.atEnd()) {
            QString result;
            Lexer::Token token = lexer.nextToken(result);
            if (lexer.error()) {
                cout << "Error " << token2string(token) << ": \""
                     << lexer.error().asString().toLatin1().constData() << "\" at ("
                     << lexer.error().line() << "," << lexer.error().column()
                     << ")" << endl;
                break;
            } else {
                cout << "Got " << token2string(token) << ": \""
                     << result.toUtf8().data() << "\" at ("
                     << lexer.line() << "," << lexer.column() << ")" << endl;
            }
        }
        cout << "End" << endl;
    } else if (argc == 1) {   // automated test
        bool success = true;
        for (int i = 0; i < numTestCases; ++i) {
            bool ok = true;
            const TestCase &t = testcases[i];
            const char *const send = t.string + qstrlen(t.string);
            Lexer lexer(t.string, send, Lexer::IncludeComments);
            cerr << t.name << ":";
            for (int j = 0; !lexer.atEnd(); ++j) {
                QString result;
                Lexer::Token token = lexer.nextToken(result);
                Error error = lexer.error();
                if (t.expected[j].token != token) {
                    ok = false;
                    cerr << " expected token " << token2string(t.expected[j].token)
                         << ", got " << token2string(token);
                }
                if (QString::fromUtf8(t.expected[j].result) != result) {
                    ok = false;
                    if (t.expected[j].result) {
                        cerr << " expected string \"" << t.expected[j].result << "\"";
                    } else {
                        cerr << " expected null string";
                    }
                    if (!result.toUtf8().isNull()) {
                        cerr << ", got \"" << result.toUtf8().data() << "\"";
                    } else {
                        cerr << ", got null string";
                    }
                }
                if (error && error.type() != t.expectedError) {
                    ok = false;
                    cerr << " expected error #" << (int)t.expectedError
                         << ", got #" << (int)error.type();
                }
                if (error && (error.line() != t.errorLine || error.column() != t.errorCol)) {
                    ok = false;
                    cerr << " expected position (" << t.errorLine << "," << t.errorCol
                         << "), got (" << error.line() << "," << error.column() << ")";
                }
                if (error) {
                    goto ErrorOut;
                }
                if (t.expected[j].token == Lexer::None
                    && t.expected[j].result == nullptr) {
                    break;
                }
            }
            if (!lexer.atEnd()) {
                ok = false;
                cerr << " premature end of expected token list";
            }
ErrorOut:
            if (ok) {
                cerr << " ok";
            }
            cerr << endl;
            if (!ok) {
                success = false;
            }
        }
        if (!success) {
            return 1;
        }
    } else { // usage error
        cerr << "usage: lexertest [ <string> ]" << endl;
        exit(1);
    }

    return 0;
}
