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#include <stdio.h>

#include <string.h>

#include <qbytearray.h>

#include <qlist.h>

struct Keyword

{

    const char *lexem;

    const char *token;

};

static const Keyword pp_keywords[] = {

    { "<", "PP_LANGLE" },

    { ">", "PP_RANGLE" },

    { "(", "PP_LPAREN"},

    { ")", "PP_RPAREN"},

    { ",", "PP_COMMA"},

    { "\n", "PP_NEWLINE"},

    { "#define", "PP_DEFINE"},

    { "#if", "PP_IF"},

    { "#undef", "PP_UNDEF"},

    { "#ifdef", "PP_IFDEF"},

    { "#ifndef", "PP_IFNDEF"},

    { "#elif", "PP_ELIF"},

    { "#else", "PP_ELSE"},

    { "#endif", "PP_ENDIF"},

    { "#include", "PP_INCLUDE"},

    { "defined", "PP_DEFINED"},

    { "+", "PP_PLUS" },

    { "-", "PP_MINUS" },

    { "*", "PP_STAR" },

    { "/", "PP_SLASH" },

    { "%", "PP_PERCENT" },

    { "^", "PP_HAT" },

    { "&", "PP_AND" },

    { "bitand", "PP_AND" },

    { "|", "PP_OR" },

    { "bitor", "PP_OR" },

    { "~", "PP_TILDE" },

    { "compl", "PP_TILDE" },

    { "!", "PP_NOT" },

    { "not", "PP_NOT" },

    { "<<", "PP_LTLT" },

    { ">>", "PP_GTGT" },

    { "==", "PP_EQEQ" },

    { "!=", "PP_NE" },

    { "not_eq", "PP_NE" },

    { "<=", "PP_LE" },

    { ">=", "PP_GE" },

    { "&&", "PP_ANDAND" },

    { "||", "PP_OROR" },

    { "?", "PP_QUESTION" },

    { ":", "PP_COLON" },

    { "##", "PP_HASHHASH"},

    { "%:%:", "PP_HASHHASH"},

    { "#", "PP_HASH"},

    { "\"", "PP_QUOTE"},

    { "\'", "PP_SINGLEQUOTE"},

    { " ", "PP_WHITESPACE" },

    { "\t", "PP_WHITESPACE" },

    { "//", "PP_CPP_COMMENT" },

    { "/*", "PP_C_COMMENT" },

    { "\\", "PP_BACKSLASH" },

    { 0, "PP_NOTOKEN"}

};

static const Keyword keywords[] = {

    { "<", "LANGLE" },

    { ">", "RANGLE" },

    { "(", "LPAREN" },

    { ")", "RPAREN" },

    { "...", "ELIPSIS" },

    { ",", "COMMA" },

    { "[", "LBRACK" },

    { "]", "RBRACK" },

    { "<:", "LBRACK" },

    { ":>", "RBRACK" },

    { "<::", "LANGLE_SCOPE" },

    { "{", "LBRACE" },

    { "<%", "LBRACE" },

    { "}", "RBRACE" },

    { "%>", "RBRACE" },

    { "=", "EQ" },

    { "::", "SCOPE" },

    { ";", "SEMIC" },

    { ":", "COLON" },

    { ".*", "DOTSTAR" },

    { "?", "QUESTION" },

    { ".", "DOT" },

    { "dynamic_cast", "DYNAMIC_CAST" },

    { "static_cast", "STATIC_CAST" },

    { "reinterpret_cast", "REINTERPRET_CAST" },

    { "const_cast", "CONST_CAST" },

    { "typeid", "TYPEID" },

    { "this", "THIS" },

    { "template", "TEMPLATE" },

    { "throw", "THROW" },

    { "try", "TRY" },

    { "catch", "CATCH" },

    { "typedef", "TYPEDEF" },

    { "friend", "FRIEND" },

    { "class", "CLASS" },

    { "namespace", "NAMESPACE" },

    { "enum", "ENUM" },

    { "struct", "STRUCT" },

    { "union", "UNION" },

    { "virtual", "VIRTUAL" },

    { "private", "PRIVATE" },

    { "protected", "PROTECTED" },

    { "public", "PUBLIC" },

    { "export", "EXPORT" },

    { "auto", "AUTO" },

    { "register", "REGISTER" },

    { "extern", "EXTERN" },

    { "mutable", "MUTABLE" },

    { "asm", "ASM" },

    { "using", "USING" },

    { "inline", "INLINE" },

    { "explicit", "EXPLICIT" },

    { "static", "STATIC" },

    { "const", "CONST" },

    { "volatile", "VOLATILE" },

    { "operator", "OPERATOR" },

    { "sizeof", "SIZEOF" },

    { "new", "NEW" },

    { "delete", "DELETE" },

    { "+", "PLUS" },

    { "-", "MINUS" },

    { "*", "STAR" },

    { "/", "SLASH" },

    { "%", "PERCENT" },

    { "^", "HAT" },

    { "&", "AND" },

    { "bitand", "AND" },

    { "|", "OR" },

    { "bitor", "OR" },

    { "~", "TILDE" },

    { "compl", "TILDE" },

    { "!", "NOT" },

    { "not", "NOT" },

    { "+=", "PLUS_EQ" },

    { "-=", "MINUS_EQ" },

    { "*=", "STAR_EQ" },

    { "/=", "SLASH_EQ" },

    { "%=", "PERCENT_EQ" },

    { "^=", "HAT_EQ" },

    { "&=", "AND_EQ" },

    { "|=", "OR_EQ" },

    { "<<", "LTLT" },

    { ">>", "GTGT" },

    { ">>=", "GTGT_EQ" },

    { "<<=", "LTLT_EQ" },

    { "==", "EQEQ" },

    { "!=", "NE" },

    { "not_eq", "NE" },

    { "<=", "LE" },

    { ">=", "GE" },

    { "&&", "ANDAND" },

    { "||", "OROR" },

    { "++", "INCR" },

    { "--", "DECR" },

    { ",", "COMMA" },

    { "->*", "ARROW_STAR" },

    { "->", "ARROW" },

    { "char", "CHAR" },

    { "wchar", "WCHAR" },

    { "bool", "BOOL" },

    { "short", "SHORT" },

    { "int", "INT" },

    { "long", "LONG" },

    { "signed", "SIGNED" },

    { "unsigned", "UNSIGNED" },

    { "float", "FLOAT" },

    { "double", "DOUBLE" },

    { "void", "VOID" },

    { "case", "CASE" },

    { "default", "DEFAULT" },

    { "if", "IF" },

    { "else", "ELSE" },

    { "switch", "SWITCH" },

    { "while", "WHILE" },

    { "do", "DO" },

    { "for", "FOR" },

    { "break", "BREAK" },

    { "continue", "CONTINUE" },

    { "goto", "GOTO" },

    { "return", "RETURN" },

    { "Q_OBJECT", "Q_OBJECT_TOKEN" },

    { "Q_GADGET", "Q_GADGET_TOKEN" },

    { "Q_PROPERTY", "Q_PROPERTY_TOKEN" },

    { "Q_ENUMS", "Q_ENUMS_TOKEN" },

    { "Q_FLAGS", "Q_FLAGS_TOKEN" },

    { "Q_DECLARE_FLAGS", "Q_DECLARE_FLAGS_TOKEN" },

    { "Q_DECLARE_INTERFACE", "Q_DECLARE_INTERFACE_TOKEN" },

    { "Q_DECLARE_METATYPE", "Q_DECLARE_METATYPE_TOKEN" },

    { "Q_DECLARE_EXTENSION_INTERFACE", "Q_DECLARE_INTERFACE_TOKEN" },

    { "Q_SETS", "Q_FLAGS_TOKEN" },

    { "Q_CLASSINFO", "Q_CLASSINFO_TOKEN" },

    { "Q_INTERFACES", "Q_INTERFACES_TOKEN" },

    { "signals", "SIGNALS" },

    { "slots", "SLOTS" },

    { "Q_SIGNALS", "Q_SIGNALS_TOKEN" },

    { "Q_SLOTS", "Q_SLOTS_TOKEN" },

    { "Q_PRIVATE_SLOT", "Q_PRIVATE_SLOT_TOKEN" },

    { "QT_MOC_COMPAT", "Q_MOC_COMPAT_TOKEN" },

    { "QT3_SUPPORT", "Q_QT3_SUPPORT_TOKEN" },

    { "Q_INVOKABLE", "Q_INVOKABLE_TOKEN" },

    { "Q_SIGNAL", "Q_SIGNAL_TOKEN" },

    { "Q_SLOT", "Q_SLOT_TOKEN" },

    { "Q_SCRIPTABLE", "Q_SCRIPTABLE_TOKEN" },

    { "\n", "NEWLINE" },

    { "\"", "QUOTE" },

    { "\'", "SINGLEQUOTE" },

    { " ", "WHITESPACE" },

    { "\t", "WHITESPACE" },

    { "#", "HASH" },

    { "\\", "BACKSLASH" },

    { "//", "CPP_COMMENT" },

    { "/*", "C_COMMENT" },

    { 0, "NOTOKEN"}

};

inline bool is_ident_start(char s)

{

    return ((s >= 'a' && s <= 'z')

            || (s >= 'A' && s <= 'Z')

            || s == '_'

        );

}

inline bool is_ident_char(char s)

{

    return ((s >= 'a' && s <= 'z')

            || (s >= 'A' && s <= 'Z')

            || (s >= '0' && s <= '9')

            || s == '_'

        );

}

struct State

{

    State(const char* token):token(token), nextindex(0),

            defchar(0), defnext(0), ident(0) {

        memset( next, 0, sizeof(next));

    }

    QByteArray token;

    int next[128];

    int nextindex;

    char defchar;

    int defnext;

    const char *ident;

    bool operator==(const State& o) const

        {

            return (token == o.token

                    && nextindex == o.nextindex

                    && defchar == o.defchar

                    && defnext == o.defnext

                    && ident == o.ident);

        }

};

void newState(QList<State> &states, const char *token, const char *lexem, bool pre)

{

    const char * ident = 0;

    if (is_ident_start(*lexem))

        ident = pre?"PP_CHARACTER" : "CHARACTER";

    else if (*lexem == '#')

        ident = pre?"PP_HASH" : "HASH";

    int state = 0;

    while (*lexem) {

        int next = states[state].next[(int)*lexem];

        if (!next) {

            const char * t = 0;

            if (ident)

                t = ident;

            else

                t = pre?"PP_INCOMPLETE":"INCOMPLETE";

            next = states.size();

            states += State(t);

            states[state].next[(int)*lexem] = next;

            states[next].ident = ident;

        }

        state = next;

        ++lexem;

        if (ident && !is_ident_char(*lexem))

            ident = 0;

    }

    states[state].token = token;

}

void newState(QList<State> &states, const char *token,  char lexem)

{

    int next = states[0].next[(int)lexem];

    if (!next) {

        next = states.size();

        states += State(token);

        states[0].next[(int)lexem] = next;

    } else {

        states[next].token = token;

    }

}

void makeTable(const Keyword keywords[])

{

    int i,c;

    bool pre = (keywords == pp_keywords);

    QList<State> states;

    states += State(pre?"PP_NOTOKEN":"NOTOKEN");

    // identifiers

    for (c = 'a'; c <= 'z'; ++c)

        newState(states, pre?"PP_CHARACTER":"CHARACTER", c);

    for (c = 'A'; c <= 'Z'; ++c)

        newState(states, pre?"PP_CHARACTER":"CHARACTER", c);

    c = '_';

    newState(states, pre?"PP_CHARACTER":"CHARACTER", c);

    // add digits

    for (c = '0'; c <= '9'; ++c)

        newState(states, pre?"PP_DIGIT":"DIGIT", c);

    // keywords

    for (i = 0; keywords[i].lexem; ++i)

        newState(states, keywords[i].token, keywords[i].lexem, pre);

    // some floats

    for (c = '0'; c <= '9'; ++c)

        newState(states, pre?"PP_FLOATING_LITERAL":"FLOATING_LITERAL",

                 QByteArray(".") + char(c), pre);

    // simplify table with default transitions

    int transindex = -1;

    for (i = 0; i < states.size(); ++i) {

        int n = 0;

        int defchar = -1;

        for (c = 0; c < 128; ++c)

            if (states[i].next[c]) {

                ++n;

                defchar = c;

            }

        if (!n)

            continue;

        if (n == 1) {

            states[i].defnext = states[i].next[defchar];

            states[i].defchar = defchar;

            continue;

        }

        states[i].nextindex = ++transindex;

    }

#if 1

    // compress table

    int j, k;

    for (i = 0; i < states.size(); ++i) {

        for (j = i + 1; j < states.size(); ++j) {

            if ( states[i] == states[j] ) {

                for (k = 0; k < states.size(); ++k) {

                    if (states[k].defnext == j)

                        states[k].defnext = i;

                    if (states[k].defnext > j)

                        --states[k].defnext;

                    for (c = 0; c < 128; ++c) {

                        if (states[k].next[c] == j)

                            states[k].next[c] = i;

                        if (states[k].next[c] > j)

                            --states[k].next[c];

                    }

                }

                states.removeAt(j);

                --j;

            }

        }

    }

#endif

    printf("static const short %skeyword_trans[][128] = {\n",

           pre?"pp_":"");

    for (i = 0; i < states.size(); ++i) {

        if (i && !states[i].nextindex)

            continue;

        printf("%s    {", i?",\n":"");

        for (c = 0; c < 128; ++c)

            printf("%s%s%d",

                   c?",":"",

                   (!c || c%16)?"":"\n     ",

                   states[i].next[c]

                   );

        printf("}");

    }

    printf("\n};\n\n");

    printf("static const struct\n{\n"

           "   %sToken token;\n"

           "   short next;\n"

           "   char defchar;\n"

           "   short defnext;\n"

           "   %sToken ident;\n"

           "} %skeywords[] = {\n",

           pre ? "PP_":"",

           pre ? "PP_":"",

           pre ? "pp_":"");

    for (i = 0; i < states.size(); ++i) {

        printf("%s    {%s, %d, %d, %d, %s}",

               i?",\n":"",

               states[i].token.data(),

               states[i].nextindex,

               states[i].defchar,

               states[i].defnext,

               states[i].ident?states[i].ident:(pre?"PP_NOTOKEN":"NOTOKEN"));

    }

    printf("\n};\n");

}

int main(int argc, char **)

{

    printf("// auto generated\n"

           "// DO NOT EDIT.\n\n");

    if ( argc > 1 )

        makeTable(pp_keywords);

    else

        makeTable(keywords);

    return 0;

}