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#include "preprocessor.h"

#include "utils.h"

#include <QStringList>

#include <QFile>

#include <QDir>

#include <QFileInfo>

QT_BEGIN_NAMESPACE

#include "ppkeywords.cpp"

#include "keywords.cpp"

// transform \r\n into \n

// \r into \n (os9 style)

// backslash-newlines into newlines

static QByteArray cleaned(const QByteArray &input)

{

    QByteArray result;

    result.reserve(input.size());

    const char *data = input;

    char *output = result.data();

    int newlines = 0;

    while (*data) {

        while (*data && is_space(*data))

            ++data;

        bool takeLine = (*data == '#');

        if (*data == '%' && *(data+1) == ':') {

            takeLine = true;

            ++data;

        }

        if (takeLine) {

            *output = '#';

            ++output;

            do ++data; while (*data && is_space(*data));

        }

        while (*data) {

            // handle \\\n, \\\r\n and \\\r

            if (*data == '\\') {

                if (*(data + 1) == '\r') {

                    ++data;

                }

                if (*data && (*(data + 1) == '\n' || (*data) == '\r')) {

                    ++newlines;

                    data += 1;

                    if (*data != '\r')

                        data += 1;

                    continue;

                }

            } else if (*data == '\r' && *(data + 1) == '\n') { // reduce \r\n to \n

                ++data;

            }

            char ch = *data;

            if (ch == '\r') // os9: replace \r with \n

                ch = '\n';

            *output = ch;

            ++output;

            if (*data == '\n') {

                // output additional newlines to keep the correct line-numbering

                // for the lines following the backslash-newline sequence(s)

                while (newlines) {

                    *output = '\n';

                    ++output;

                    --newlines;

                }

                ++data;

                break;

            }

            ++data;

        }

    }

    result.resize(output - result.constData());

    return result;

}

bool Preprocessor::preprocessOnly = false;

void Preprocessor::skipUntilEndif()

{

    while(index < symbols.size() - 1 && symbols.at(index).token != PP_ENDIF){

        switch (symbols.at(index).token) {

        case PP_IF:

        case PP_IFDEF:

        case PP_IFNDEF:

            ++index;

            skipUntilEndif();

            break;

        default:

            ;

        }

        ++index;

    }

}

bool Preprocessor::skipBranch()

{

    while (index < symbols.size() - 1

          && (symbols.at(index).token != PP_ENDIF

               && symbols.at(index).token != PP_ELIF

               && symbols.at(index).token != PP_ELSE)

       ){

        switch (symbols.at(index).token) {

        case PP_IF:

        case PP_IFDEF:

        case PP_IFNDEF:

            ++index;

            skipUntilEndif();

            break;

        default:

            ;

        }

        ++index;

    }

    return (index < symbols.size() - 1);

}

enum TokenizeMode { TokenizeCpp, TokenizePreprocessor, PreparePreprocessorStatement, TokenizePreprocessorStatement, TokenizeInclude };

static Symbols tokenize(const QByteArray &input, int lineNum = 1, TokenizeMode mode = TokenizeCpp)

{

    Symbols symbols;

    const char *begin = input;

    const char *data = begin;

    while (*data) {

        if (mode == TokenizeCpp) {

            int column = 0;

            const char *lexem = data;

            int state = 0;

            Token token = NOTOKEN;

            for (;;) {

                if (static_cast<signed char>(*data) < 0) {

                    ++data;

                    continue;

                }

                int nextindex = keywords[state].next;

                int next = 0;

                if (*data == keywords[state].defchar)

                    next = keywords[state].defnext;

                else if (!state || nextindex)

                    next = keyword_trans[nextindex][(int)*data];

                if (!next)

                    break;

                state = next;

                token = keywords[state].token;

                ++data;

            }

            // suboptimal, is_ident_char  should use a table

            if (keywords[state].ident && is_ident_char(*data))

                token = keywords[state].ident;

            if (token == NOTOKEN) {

                // an error really

                ++data;

                continue;

            }

            ++column;

            if (token > SPECIAL_TREATMENT_MARK) {

                switch (token) {

                case QUOTE:

                    data = skipQuote(data);

                    token = STRING_LITERAL;

                    // concatenate multi-line strings for easier

                    // STRING_LITERAAL handling in moc

                    if (!Preprocessor::preprocessOnly

                        && !symbols.isEmpty()

                        && symbols.last().token == STRING_LITERAL) {

                        QByteArray newString = symbols.last().unquotedLexem();

                        newString += input.mid(lexem - begin + 1, data - lexem - 2);

                        newString.prepend('\"');

                        newString.append('\"');

                        symbols.last() = Symbol(symbols.last().lineNum,

                                                STRING_LITERAL,

                                                newString);

                        continue;

                    }

                    break;

                case SINGLEQUOTE:

                    while (*data && (*data != '\''

                                     || (*(data-1)=='\\'

                                         && *(data-2)!='\\')))

                        ++data;

                    if (*data)

                        ++data;

                    token = CHARACTER_LITERAL;

                    break;

                case LANGLE_SCOPE:

                    // split <:: into two tokens, < and ::

                    token = LANGLE;

                    data -= 2;

                    break;

                case DIGIT:

                    while (is_digit_char(*data))

                        ++data;

                    if (!*data || *data != '.') {

                        token = INTEGER_LITERAL;

                        if (data - lexem == 1 &&

                            (*data == 'x' || *data == 'X')

                            && *lexem == '0') {

                            ++data;

                            while (is_hex_char(*data))

                                ++data;

                        }

                        break;

                    }

                    token = FLOATING_LITERAL;

                    ++data;

                    // fall through

                case FLOATING_LITERAL:

                    while (is_digit_char(*data))

                        ++data;

                    if (*data == '+' || *data == '-')

                        ++data;

                    if (*data == 'e' || *data == 'E') {

                        ++data;

                        while (is_digit_char(*data))

                            ++data;

                    }

                    if (*data == 'f' || *data == 'F'

                        || *data == 'l' || *data == 'L')

                        ++data;

                    break;

                case HASH:

                    if (column == 1) {

                        mode = PreparePreprocessorStatement;

                        while (*data && (*data == ' ' || *data == '\t'))

                            ++data;

                        if (is_ident_char(*data))

                            mode = TokenizePreprocessorStatement;

                        continue;

                    }

                    break;

                case NEWLINE:

                    ++lineNum;

                    continue;

                case BACKSLASH:

                {

                    const char *rewind = data;

                    while (*data && (*data == ' ' || *data == '\t'))

                        ++data;

                    if (*data && *data == '\n') {

                        ++data;

                        continue;

                    }

                    data = rewind;

                } break;

                case CHARACTER:

                    while (is_ident_char(*data))

                        ++data;

                    token = IDENTIFIER;

                    break;

                case C_COMMENT:

                    if (*data) {

                        if (*data == '\n')

                            ++lineNum;

                        ++data;

                        if (*data) {

                            if (*data == '\n')

                                ++lineNum;

                            ++data;

                        }

                    }

                    while (*data && (*(data-1) != '/' || *(data-2) != '*')) {

                        if (*data == '\n')

                            ++lineNum;

                        ++data;

                    }

                    token = WHITESPACE; // one comment, one whitespace

                    // fall through;

                case WHITESPACE:

                    if (column == 1)

                        column = 0;

                    while (*data && (*data == ' ' || *data == '\t'))

                        ++data;

                    if (Preprocessor::preprocessOnly) // tokenize whitespace

                        break;

                    continue;

                case CPP_COMMENT:

                    while (*data && *data != '\n')

                        ++data;

                    continue; // ignore safely, the newline is a separator

                default:

                    continue; //ignore

                }

            }

#ifdef USE_LEXEM_STORE

            if (!Preprocessor::preprocessOnly

                && token != IDENTIFIER

                && token != STRING_LITERAL

                && token != FLOATING_LITERAL

                && token != INTEGER_LITERAL)

                symbols += Symbol(lineNum, token);

            else

#endif

                symbols += Symbol(lineNum, token, input, lexem-begin, data-lexem);

        } else { //   Preprocessor

            const char *lexem = data;

            int state = 0;

            Token token = NOTOKEN;

            if (mode == TokenizePreprocessorStatement) {

                state = pp_keyword_trans[0][(int)'#'];

                mode = TokenizePreprocessor;

            }

            for (;;) {

                if (static_cast<signed char>(*data) < 0) {

                    ++data;

                    continue;

                }

                int nextindex = pp_keywords[state].next;

                int next = 0;

                if (*data == pp_keywords[state].defchar)

                    next = pp_keywords[state].defnext;

                else if (!state || nextindex)

                    next = pp_keyword_trans[nextindex][(int)*data];

                if (!next)

                    break;

                state = next;

                token = pp_keywords[state].token;

                ++data;

            }

            // suboptimal, is_ident_char  should use a table

            if (pp_keywords[state].ident && is_ident_char(*data))

                token = pp_keywords[state].ident;

            switch (token) {

            case NOTOKEN:

                ++data;

                break;

            case PP_IFDEF:

                symbols += Symbol(lineNum, PP_IF);

                symbols += Symbol(lineNum, PP_DEFINED);

                continue;

            case PP_IFNDEF:

                symbols += Symbol(lineNum, PP_IF);

                symbols += Symbol(lineNum, PP_NOT);

                symbols += Symbol(lineNum, PP_DEFINED);

                continue;

            case PP_INCLUDE:

                mode = TokenizeInclude;

                break;

            case PP_QUOTE:

                data = skipQuote(data);

                token = PP_STRING_LITERAL;

                break;

            case PP_SINGLEQUOTE:

                while (*data && (*data != '\''

                                 || (*(data-1)=='\\'

                                     && *(data-2)!='\\')))

                    ++data;

                if (*data)

                    ++data;

                token = PP_CHARACTER_LITERAL;

                break;

            case PP_DIGIT:

                while (is_digit_char(*data))

                    ++data;

                if (!*data || *data != '.') {

                    token = PP_INTEGER_LITERAL;

                    if (data - lexem == 1 &&

                        (*data == 'x' || *data == 'X')

                        && *lexem == '0') {

                        ++data;

                        while (is_hex_char(*data))

                            ++data;

                    }

                    break;

                }

                token = PP_FLOATING_LITERAL;

                ++data;

                // fall through

            case PP_FLOATING_LITERAL:

                while (is_digit_char(*data))

                    ++data;

                if (*data == '+' || *data == '-')

                    ++data;

                if (*data == 'e' || *data == 'E') {

                    ++data;

                    while (is_digit_char(*data))

                        ++data;

                }

                if (*data == 'f' || *data == 'F'

                    || *data == 'l' || *data == 'L')

                    ++data;

                break;

            case PP_CHARACTER:

                if (mode == PreparePreprocessorStatement) {

                    // rewind entire token to begin

                    data = lexem;

                    mode = TokenizePreprocessorStatement;

                    continue;

                }

                while (is_ident_char(*data))

                    ++data;

                token = PP_IDENTIFIER;

                break;

            case PP_C_COMMENT:

                if (*data) {

                    if (*data == '\n')

                        ++lineNum;

                    ++data;

                    if (*data) {

                        if (*data == '\n')

                            ++lineNum;

                        ++data;

                    }

                }

                while (*data && (*(data-1) != '/' || *(data-2) != '*')) {

                    if (*data == '\n')

                        ++lineNum;

                    ++data;

                }

                token = PP_WHITESPACE; // one comment, one whitespace

                // fall through;

            case PP_WHITESPACE:

                while (*data && (*data == ' ' || *data == '\t'))

                    ++data;

                continue; // the preprocessor needs no whitespace

            case PP_CPP_COMMENT:

                while (*data && *data != '\n')

                    ++data;

                continue; // ignore safely, the newline is a separator

            case PP_NEWLINE:

                ++lineNum;

                mode = TokenizeCpp;

                break;

            case PP_BACKSLASH:

            {

                const char *rewind = data;

                while (*data && (*data == ' ' || *data == '\t'))

                    ++data;

                if (*data && *data == '\n') {

                    ++data;

                    continue;

                }

                data = rewind;

            } break;

            case PP_LANGLE:

                if (mode != TokenizeInclude)

                    break;

                token = PP_STRING_LITERAL;

                while (*data && *data != '\n' && *(data-1) != '>')

                    ++data;

                break;

            default:

                break;

            }

            if (mode == PreparePreprocessorStatement)

                continue;

#ifdef USE_LEXEM_STORE

            if (token != PP_IDENTIFIER

                && token != PP_STRING_LITERAL

                && token != PP_FLOATING_LITERAL

                && token != PP_INTEGER_LITERAL)

                symbols += Symbol(lineNum, token);

            else

#endif

                symbols += Symbol(lineNum, token, input, lexem-begin, data-lexem);

        }

    }

    symbols += Symbol(); // eof symbol

    return symbols;

}

void Preprocessor::substituteMacro(const MacroName &macro, Symbols &substituted, MacroSafeSet safeset)

{

    Symbols saveSymbols = symbols;

    int saveIndex = index;

    symbols = macros.value(macro).symbols;

    index = 0;

    safeset += macro;

    substituteUntilNewline(substituted, safeset);

    symbols = saveSymbols;

    index = saveIndex;

}