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99.35

/sjasm/parser.cpp

/*

  SjASMPlus Z80 Cross Compiler

  This is modified sources of SjASM by Aprisobal - aprisobal@tut.by

  Copyright (c) 2005 Sjoerd Mastijn

  This software is provided 'as-is', without any express or implied warranty.
  In no event will the authors be held liable for any damages arising from the
  use of this software.

  Permission is granted to anyone to use this software for any purpose,
  including commercial applications, and to alter it and redistribute it freely,
  subject to the following restrictions:

  1. The origin of this software must not be misrepresented; you must not claim
         that you wrote the original software. If you use this software in a product,
         an acknowledgment in the product documentation would be appreciated but is
         not required.

  2. Altered source versions must be plainly marked as such, and must not be
         misrepresented as being the original software.

  3. This notice may not be removed or altered from any source distribution.

*/

// parser.cpp

#include "sjdefs.h"

static bool synerr = true;        // flag whether ParseExpression should report syntax error with Error()

static int ParseExpressionEntry(char*& p, aint& nval);

static int ParseExpPrim(char*& p, aint& nval) {
        int res = 0;
        if (SkipBlanks(p)) {
                return 0;
        }
        if (*p == '(') {
                ++p;
                res = ParseExpressionEntry(p, nval);
                if (!need(p, ')')) {
                        Error("')' expected");
                        return 0;
                }
        } else if (DeviceID && *p == '{') {                // read WORD/BYTE from virtual device memory
                char* const readMemP = p;
                const int byteOnly = cmphstr(++p, "b");
                // switch off alternative relocation evaluation for the address value
                const bool oldAreLabelsOffset = Relocation::areLabelsOffset;
                Relocation::areLabelsOffset = false;
                int addressParseRes = ParseExpressionEntry(p, nval);
                Relocation::areLabelsOffset = oldAreLabelsOffset;        // restore alternative evaluation
                if (!addressParseRes) return 0;        // some syntax error inside the address expression
                if (!need(p, '}')) {
                        Error("'}' expected", readMemP, SUPPRESS);
                        return 0;
                }
                if (nval < 0 || (0xFFFE + byteOnly) < nval) {
                        Error("Address in {..} must fetch bytes from 0x0000..0xFFFF range", readMemP);
                        nval = 0;
                        return 1;                                                // and return zero value as result (avoid "syntax error")
                }
                res = int(MemGetByte(nval));
                if (!byteOnly) res += int(MemGetByte(nval + 1)) << 8;
                nval = res;
                return 1;
        } else if (isdigit((byte)*p) && GetTemporaryLabelValue(p, nval, true)) {        // temporary label with underscore suffix
                return 1;
        } else if (isdigit((byte)*p) || (*p == '#' && isalnum((byte)*(p + 1))) || (*p == '$' && isalnum((byte)*(p + 1))) || *p == '%') {
                return GetConstant(p, nval);
        } else if (isLabelStart(p)) {
                return GetLabelValue(p, nval);
        } else if (*p == '?' && isLabelStart(p+1)) {
                // this is undocumented "?<symbol>" operator, seems as workaround for labels like "not"
                // This is deprecated and will be removed in v2.x of sjasmplus
                // (where keywords will be reserved and such label would be invalid any way)
                Warning("?<symbol> operator is deprecated and will be removed in v2.x", p);
                ++p;
                return GetLabelValue(p, nval);
        } else if ('$' == p[0] && '$' == p[1] && '$' == p[2] && '$' == p[3] && isLabelStart(p + 4)) {
                p += 4;                                                                // $$$$label variant returns physical page
                return GetLabelPhPage(p, nval);
        } else if ('$' == p[0] && '$' == p[1] && '$' == p[2] && isLabelStart(p + 3)) {
                p += 3;                                                                // $$$label variant returns physical value
                return GetLabelPhValue(p, nval);
        } else if (DISP_NONE != PseudoORG && '$' == p[0] && '$' == p[1] && '$' == p[2]) {
                if ('$' == p[3]) {                // "$$$$" operator to get physical memory page inside DISP block
                        p += 4;
                        nval = DeviceID ? Page->Number : LABEL_PAGE_UNDEFINED;
                        return 1;
                }
                // "$$$" operator to get physical address inside DISP block
                p += 3;
                nval = adrdisp;                // this is never affected by relocation
                return 1;
        } else if (DeviceID && *p == '$' && *(p + 1) == '$') {
                p += 2;
                if (isLabelStart(p)) return GetLabelPage(p, nval);
                if (DISP_NONE != PseudoORG && LABEL_PAGE_UNDEFINED != dispPageNum) {
                        // enforce explicit request of fake DISP page
                        nval = dispPageNum;
                } else {
                        // current page
                        nval = Page->Number;
                }
                return 1;
        } else if (*p == '$') {
                ++p;
                nval = CurAddress;
                if (Relocation::type && Relocation::areLabelsOffset && DISP_INSIDE_RELOCATE != PseudoORG) {
                        nval += Relocation::alternative_offset;
                }
                return 1;
        } else if (!(res = GetCharConst(p, nval))) {
                if (synerr) Error("Syntax error", p, IF_FIRST);
                return 0;
        }
        return res;
}

static int ParseExpUnair(char*& p, aint& nval) {
        SkipBlanks(p);
        char* oldP = p;
        if (cmphstr(p, "norel", true)) {
                // switch off alternative relocation evaluation for the following part of expression
                const bool oldAreLabelsOffset = Relocation::areLabelsOffset;
                Relocation::areLabelsOffset = false;
                int norelParseRes = ParseExpPrim(p, nval);                        // higher priority than other unary
                Relocation::areLabelsOffset = oldAreLabelsOffset;        // restore alternative evaluation
                if (norelParseRes) return 1;
                // "norel" operator didn't parse successfully, try to ignore it (will treat it as label)
                p = oldP;
        }
        if (cmphstr(p, "exist", true)) {
                int existEval = 0, hasParentheses = need(p, '(');
                if (hasParentheses || isLabelStart(p)) {
                        existEval = LabelExist(p, nval);
                }
                if (existEval && hasParentheses) {
                        existEval = need(p, ')');                                                // check closing parenthesis
                }
                if (existEval) return 1;
                p = oldP;
        }
        if (cmphstr(p, "sizeof", true)) {
                int sizeofEval = 0, hasParentheses = need(p, '(');
                if (hasParentheses || isLabelStart(p)) {                        // may tag label as +sizeof even when closing parenthesis
                        sizeofEval = GetLabelSize(p, nval);                                // is missing: OK, it's just extra trait causing extra tracking
                }
                if (hasParentheses) {
                        sizeofEval &= need(p, ')');
                }
                if (sizeofEval) return 1;        // valid label name (and valid optional parentheses)
                p = oldP;                                        // invalid label name or parentheses, try to ignore "sizeof"
        }
        aint right;
        int oper;
        if ((oper = need(p, "! ~ + - ")) || \
                (oper = needa(p, "not", '!', "low", 'l', "high", 'h', true)) || \
                (oper = needa(p, "abs", 'a', nullptr, 0, nullptr, 0, true)) ) {
                switch (oper) {
                case '!':
                        if (!ParseExpUnair(p, right)) return 0;
                        nval = -!right;
                        break;
                case '~':
                        if (!ParseExpUnair(p, right)) return 0;
                        nval = ~right;
                        break;
                case '+':
                        if (!ParseExpUnair(p, right)) return 0;
                        nval = right;
                        break;
                case '-':
                        if (!ParseExpUnair(p, right)) return 0;
                        nval = ~right + 1;
                        break;
                case 'l':
                        if (!ParseExpUnair(p, right)) return 0;
                        nval = right & 255;
                        break;
                case 'h':
                        if (!ParseExpUnair(p, right)) return 0;
                        nval = (right >> 8) & 255;
                        break;
                case 'a':
                        if (!ParseExpUnair(p, right)) return 0;
                        nval = abs(right);
                        break;
                default: Error("internal error", nullptr, FATAL); break;        // unreachable
                }
                return 1;
        } else {
                return ParseExpPrim(p, nval);
        }
}

static int ParseExpMul(char*& p, aint& nval) {
        aint left, right;
        int oper;
        if (!ParseExpUnair(p, left)) return 0;
        while ((oper = need(p, "* / % ")) || (oper = needa(p, "mod", '%'))) {
                if (!ParseExpUnair(p, right)) return 0;
                switch (oper) {
                case '*':
                        left *= right; break;
                case '/':
                        left = right ? left / right : 0;
                        if (!right) Error("Division by zero");
                        break;
                case '%':
                        left = right ? left % right : 0;
                        if (!right) Error("Division by zero");
                        break;
                default: Error("internal error", nullptr, FATAL); break;        // unreachable
                }
        }
        nval = left;
        return 1;
}

static int ParseExpAdd(char*& p, aint& nval) {
        aint left, right;
        int oper;
        if (!ParseExpMul(p, left)) return 0;
        while ((oper = need(p, "+ - "))) {
                if (!ParseExpMul(p, right)) return 0;
                if ('-' == oper) right = -right;
                left += right;
        }
        nval = left;
        return 1;
}

static int ParseExpShift(char*& p, aint& nval) {
        aint left, right;
        uint32_t l;
        int oper;
        if (!ParseExpAdd(p, left)) return 0;
        while ((oper = need(p, "<<>>")) || (oper = needa(p, "shl", '<' + '<', "shr", '>' + '>'))) {
                if (oper == '>' + '>' && *p == '>') {
                        ++p;
                        oper += '>';
                }
                if (!ParseExpAdd(p, right)) return 0;
                switch (oper) {
                case '<'+'<':
                        left <<= right; break;
                case '>'+'>':
                        left >>= right; break;
                case '>'+'>'+'>':
                        l = left; l >>= right; left = l; break;
                default: Error("internal error", nullptr, FATAL); break;        // unreachable
                }
        }
        nval = left;
        return 1;
}

static int ParseExpMinMax(char*& p, aint& nval) {
        aint left, right;
        int oper;
        if (!ParseExpShift(p, left)) return 0;
        while ((oper = need(p, "<?>?"))) {
                if (!ParseExpShift(p, right)) return 0;
                switch (oper) {
                case '<'+'?':
                        left = left < right ? left : right; break;
                case '>'+'?':
                        left = left > right ? left : right; break;
                default: Error("internal error", nullptr, FATAL); break;        // unreachable
                }
        }
        nval = left;
        return 1;
}

static int ParseExpCmp(char*& p, aint& nval) {
        aint left, right;
        int oper;
        if (!ParseExpMinMax(p, left)) return 0;
        while ((oper = need(p, "<=>=< > "))) {
                if (!ParseExpMinMax(p, right)) return 0;
                switch (oper) {
                case '<':
                        left = -(left < right); break;
                case '>':
                        left = -(left > right); break;
                case '<'+'=':
                        left = -(left <= right); break;
                case '>'+'=':
                        left = -(left >= right); break;
                default: Error("internal error", nullptr, FATAL); break;        // unreachable
                }
        }
        nval = left;
        return 1;
}

static int ParseExpEqu(char*& p, aint& nval) {
        aint left, right;
        int oper;
        if (!ParseExpCmp(p, left)) return 0;
        while ((oper = need(p, "=_==!="))) {
                if (!ParseExpCmp(p, right)) return 0;
                left = (('!'+'=') == oper) ? -(left != right) : -(left == right);
        }
        nval = left;
        return 1;
}

static int ParseExpBitAnd(char*& p, aint& nval) {
        aint left, right;
        if (!ParseExpEqu(p, left)) return 0;
        while (need(p, "&_") || needa(p, "and", '&')) {
                if (!ParseExpEqu(p, right)) return 0;
                left &= right;
        }
        nval = left;
        return 1;
}

static int ParseExpBitXor(char*& p, aint& nval) {
        aint left, right;
        if (!ParseExpBitAnd(p, left)) return 0;
        while (need(p, "^ ") || needa(p, "xor", '^')) {
                if (!ParseExpBitAnd(p, right)) return 0;
                left ^= right;
        }
        nval = left;
        return 1;
}

static int ParseExpBitOr(char*& p, aint& nval) {
        aint left, right;
        if (!ParseExpBitXor(p, left)) return 0;
        while (need(p, "|_") || needa(p, "or", '|')) {
                if (!ParseExpBitXor(p, right)) return 0;
                left |= right;
        }
        nval = left;
        return 1;
}

static int ParseExpLogAnd(char*& p, aint& nval) {
        aint left, right;
        if (!ParseExpBitOr(p, left)) return 0;
        while (need(p, "&&")) {
                if (!ParseExpBitOr(p, right)) return 0;
                left = -(left && right);
        }
        nval = left;
        return 1;
}

static int ParseExpLogOr(char*& p, aint& nval) {
        aint left, right;
        if (!ParseExpLogAnd(p, left)) return 0;
        while (need(p, "||")) {
                if (!ParseExpLogAnd(p, right)) return 0;
                left = -(left || right);
        }
        nval = left;
        return 1;
}

static int ParseExpressionEntry(char*& p, aint& nval) {
        if (ParseExpLogOr(p, nval)) return 1;
        nval = 0;
        return 0;
}

int ParseExpression(char*& p, aint& nval) {
        // if relocation is active, do the full evaluation in syntax-error-OFF mode with alternative
        // label values, and remember the result (to compare it with regular evaluation afterward)
        aint relocationVal = 0;
        int relocationRes = 0;
        if (Relocation::type) {
                char* altP = p;
                bool osynerr = synerr;
                synerr = false;
                Relocation::areLabelsOffset = true;
                relocationRes = ParseExpressionEntry(altP, relocationVal);
                Relocation::areLabelsOffset = false;
                synerr = osynerr;
        }
        // if relocation is off, or the alternative run did finish already, do regular evaluation
        int res = ParseExpressionEntry(p, nval);
        // set the Relocation::isResultAffected if the two alternative results are different
        if (res && relocationRes) {
                const bool isAffected = (relocationVal != nval);
                Relocation::isResultAffected |= isAffected;
                Relocation::deltaType =
                        (Relocation::alternative_offset == (relocationVal - nval)) ? Relocation::REGULAR :
                        ((Relocation::HIGH == Relocation::type) && ((Relocation::alternative_offset >> 8) == (relocationVal - nval))) ? Relocation::HIGH :
                        Relocation::OFF;
        }
        return res;
}

int ParseExpressionNoSyntaxError(char*& lp, aint& val) {
        bool osynerr = synerr;
        synerr = false;
        int ret_val = ParseExpression(lp, val);
        synerr = osynerr;
        return ret_val;
}

static int ParseExpressionInSubstitution(char *& lp, aint& val) {
        assert(!IsSubstituting);
        IsSubstituting = true;
        int ret_val = ParseExpressionNoSyntaxError(lp, val);
        IsSubstituting = false;
        return ret_val;
}

// returns 0 on syntax error, 1 on expression which is not enclosed in parentheses
// 2 when whole expression is in [] or () (--syntax=b/B affects when "2" is reported)
int ParseExpressionMemAccess(char*& p, aint& nval) {
        const EBracketType bt = OpenBracket(p);
        // if round parenthesis starts the expression, calculate pointer where it ends (and move "p" back on "(")
        char* const expectedEndBracket = (BT_ROUND == bt) ? ParenthesesEnd(--p) : nullptr;
        if (!ParseExpression(p, nval)) return 0;        // evaluate expression
        if (BT_NONE == bt) return 1;                                // no parentheses are always "value"
        if (BT_ROUND == bt) return (expectedEndBracket == p) ? 2 : 1;        // round parentheses are "memory" when end is as expected
        if (CloseBracket(p)) return 2;                                // square brackets must be closed properly, then it is "memory"
        return 0;        // curly brackets are not detect by OpenBracket, but if they would, it would work same as square here
}

void ParseAlignArguments(char* & src, aint & alignment, aint & fill) {
        SkipBlanks(src);
        const char * const oldSrc = src;
        fill = -1;
        if (!ParseExpression(src, alignment)) {
                alignment = -1;
                return;
        }
        if (Relocation::type) {
                WarningById(W_RELOCATABLE_ALIGN);
        }
        // check if alignment value is power of two (0..15-th power only)
        if (alignment < 1 || (1<<15) < alignment || (alignment & (alignment-1))) {
                Error("[ALIGN] Illegal align", oldSrc, SUPPRESS);
                alignment = 0;
                return;
        }
        if (!comma(src)) return;
        if (!ParseExpressionEntry(lp, fill)) {
                Error("[ALIGN] fill-byte expected after comma", bp, IF_FIRST);
                fill = -1;
        } else if (fill < 0 || 255 < fill) {
                Error("[ALIGN] Illegal align fill-byte", oldSrc, SUPPRESS);
                fill = -1;
        }
}

static constexpr const char GLUE_TAG = 10;                // '\n' CR abused for glues, can't be part of source line
static constexpr const char GLUE_CHAR = '_';
static bool glueToProcess = false;

static bool ReplaceDefineInternal(char* lp, char* const nl) {
        int definegereplaced = 0,dr;
        char* rp = nl,* nid;
        const char* ver;
        bool isDefDir = false;        // to remember if one of DEFINE-related directives was used
        bool afterNonAlphaNum, afterNonAlphaNumNext = true;
        char defarrayCountTxt[16] = { 0 };
        while (*lp && ((rp - nl) < LINEMAX)) {
                const char c1 = lp[0], c2 = lp[1];
                afterNonAlphaNum = afterNonAlphaNumNext;
                afterNonAlphaNumNext = !isalnum((byte)c1);
                if (c1 == '/' && c2 == '*') {        // block-comment local beginning (++block_nesting)
                        lp += 2;
                        ++comlin;
                        continue;
                }
                if (comlin) {
                        if (c1 == '*' && c2 == '/') {
                                lp += 2;
                                // insert space into line, if the block ending may have affected parsing of line
                                if (1 == comlin) {
                                        *rp++ = ' ';                // ^^ otherwise this line is completely commented out
                                }
                                --comlin;        // decrement block comment counter
                        } else {
                                ++lp;                // just skip all characters inside comment block
                        }
                        continue;
                }
                // for following code (0 == comlin) (unless it has its own parse loop)

                // single line comments -> finish
                if (c1 == ';' || (c1 == '/' && c2 == '/')) {
                        // set empty eol line comment, if the source of data is still the original "line" buffer
                        if (!eolComment && line <= lp && lp < line+LINEMAX) eolComment = lp;
                        break;
                }

                // strings parsing
                if (afterNonAlphaNum && (c1 == '"' || c1 == '\'')) {
                        *rp++ = *lp++;                                // copy the string delimiter (" or ')
                        // apostrophe inside apostrophes ('') will parse as end + start of another string
                        // which sort of "accidentally" leads to correct final results
                        while (*lp && c1 != *lp) {        // until end of current string is reached (or line ends)
                                // inside double quotes the backslash should escape (anything after it)
                                if ('"' == c1 && '\\' == *lp && lp[1]) *rp++ = *lp++;        // copy escaping backslash extra
                                *rp++ = *lp++;                        // copy string character
                        }
                        if (*lp) *rp++ = *lp++;                // copy the ending string delimiter (" or ')
                        continue;
                }

                if (!isLabelStart(lp, false)) {
                        *rp++ = *lp++;
                        continue;
                }

                // update "is define-related directive" for remainder of the line
                char* kp = lp;
                isDefDir |= afterNonAlphaNum && (cmphstr(kp, "define+") || cmphstr(kp, "define")
                        || cmphstr(kp, "undefine") || cmphstr(kp, "defarray+") || cmphstr(kp, "defarray")
                        || cmphstr(kp, "ifdef") || cmphstr(kp, "ifndef"));
                // if DEFINE-related directive was used, only macro-arguments are substituted
                // in the remaining part of the line, the define-based substitution is inhibited till EOL

                // The following loop is recursive-like macro/define substitution, the `*lp` here points
                // at alphabet/underscore char, marking start of "id" string, and it will be parsed by
                // sub-id parts, delimited by underscores, each combination of consecutive sub-ids may
                // be substituted by some macro argument or define.

                //TODO - maybe consider the substitution search to go downward, from longest term to shortest subterm
                ResetGrowSubId();
                char* nextSubIdLp = lp, * wholeIdLp = lp;
                do { //while(islabchar(*lp));
                        nid = GrowSubId(lp);                // grow the current sub-id part by part, checking each combination for substitution
                        // defines/macro arguments can substitute in the middle of ID only if they don't start with underscore
                        const bool canSubstituteInside = '_' != nid[0] || nextSubIdLp == wholeIdLp;
                        if (macrolabp && canSubstituteInside && (ver = MacroDefineTable.getverv(nid))) {
                                dr = 2;                        // macro argument substitution is possible
                        } else if (!isDefDir && canSubstituteInside && (ver = DefineTable.Get(nid))) {
                                dr = 1;                        // DEFINE substitution is possible
                                //handle DEFARRAY case
                                if (DefineTable.DefArrayList) {
                                        ver = nid;        // in case of some error, just copy the array id "as is"
                                        CStringsList* a = DefineTable.DefArrayList;
                                        while (White(*lp)) GrowSubIdByExtraChar(lp);
                                        aint val;
                                        if ('[' != *lp) Error("[ARRAY] Expression error", nextSubIdLp, SUPPRESS);
                                        if ('[' == *lp && '#' == lp[1] && ']' == lp[2]) {        // calculate size of defarray
                                                lp += 3;
                                                val = 0;
                                                while (a) {
                                                        ++val;
                                                        a = a->next;
                                                }
                                                SPRINTF1(defarrayCountTxt, 16, "%d", val);
                                                ver = defarrayCountTxt;
                                        } else {
                                                char* expLp = lp + ('[' == *lp);        // the '[' will become part of subId in didParseBrackets
                                                IsLabelNotFound = false;
                                                bool didParseBrackets = '[' == *lp && GrowSubIdByExtraChar(lp) && ParseExpressionInSubstitution(lp, val) && ']' == *lp;
                                                if (didParseBrackets && !IsLabelNotFound) {
                                                        // expression was successfully parsed and all values were known
                                                        ++lp;
                                                        while (0 < val && a) {
                                                                a = a->next;
                                                                --val;
                                                        }
                                                        if (val < 0 || NULL == a) {
                                                                *defarrayCountTxt = 0;                // substitute with empty string
                                                                ver = defarrayCountTxt;
                                                                Error("[ARRAY] index not in 0..<Size-1> range", nextSubIdLp, SUPPRESS);
                                                        } else {
                                                                ver = a->string;        // substitute with array value
                                                        }
                                                } else {        // no substitution of array possible at this time (index eval / syntax error)
                                                        lp = expLp;                                // restore lp in case expression parser went ahead a lot
                                                        dr = -1;// write into output, but don't count as replacement
                                                }
                                        }
                                }
                        } else {
                                dr = 0;                        // no possible substitution found
                                ver = nid;
                        }
                        // check if no substitution was found, and there's no more chars to extend SubId
                        if (0 == dr && !islabchar(*lp)) {
                                lp = nextSubIdLp;                // was fully extended, no match, "eat" first subId
                                ResetGrowSubId();
                                ver = GrowSubId(lp);        // find the first SubId again, for the copy
                                dr = -1;                                // write into output, but don't count as replacement
                        }
                        if (0 < dr) {
                                definegereplaced = 1;        // above zero => count as replacement
                                // look ahead in "to" array to convert any whitespace enclosed `_` to glue tag
                                char* gluep = rp;                // first skip whitespace ahead of substitution
                                while ((nl < gluep--) && (GLUE_TAG != gluep[0]) && (White(gluep[0]))) /* empty */;
                                // now check if there was whitespace, is glue char '_' and further whitespace ahead of it
                                if ((nl < gluep) && (gluep + 1 < rp) && (GLUE_CHAR == gluep[0]) && White(gluep[-1])) {
                                        gluep[0] = GLUE_TAG;// convert it to glue tag for later
                                        glueToProcess = true;
                                }
                                // look after in "from" array to convert any whitespace enclosed `_` to glue tag
                                for (gluep = lp; GLUE_TAG != gluep[0] && White(gluep[0]); ) ++gluep;
                                if ((lp < gluep) && (GLUE_CHAR == gluep[0]) && White(gluep[1])) {
                                        gluep[0] = GLUE_TAG;// convert it to glue tag for later
                                        glueToProcess = true;
                                }
                        }
                        if (0 != dr) {                                // any non-zero dr => write to the output
                                while (*ver && ((rp - nl) < LINEMAX)) *rp++ = *ver++;                // replace the string into target buffer
                                // reset subId parser to catch second+ subId in current Id
                                ResetGrowSubId();
                                nextSubIdLp = lp;
                        }
                        // continue with extending the subId, if there's still something to parse
                } while(islabchar(*lp));
        } // while(*lp)
        // add line terminator to the output buffer
        *rp++ = 0;
        if (LINEMAX <= (rp - nl)) {
                Error("line too long after macro expansion", nl, SUPPRESS);
        }
        // if no substitution happened, but there are glue bytes, glue it all together now
        if (0 == definegereplaced && glueToProcess) {
                // now glue the pieces together around each glue
                int dropChars = 0;
                for (rp = nl; *rp; ++rp) {
                        if (GLUE_TAG == *rp) {
                                char* leftp = rp + dropChars, * rightp = rp;
                                while (nl < leftp && White(leftp[-1])) --leftp;        // eat all whitespace to left
                                while (White(rightp[0])) ++rightp;                                // eat all whitespace to right
                                // leftp points at left-most whitespace char, rightp points at first non-whitespace or \0
                                if ((nl == leftp) || (0 == rightp[0])) rp[0] = GLUE_CHAR;        // nothing to glue with, restore
                                else {
                                        dropChars = (leftp - rightp);                                // discard this whitespace + glue block
                                        rp = rightp;
                                }
                        }
                        if (dropChars < 0) rp[dropChars] = rp[0];        // move other chars over removed areas
                }
                rp[dropChars] = 0;                // make sure there's zero terminator also for glued result
                glueToProcess = false;
                return true;                        // report modification
        }
        // check if whole line is just blanks, then return just empty one
        rp = nl;
        if (!glueToProcess && SkipBlanks(rp)) *nl = 0;                // only when glues were processed as well
        substitutedLine = nl;                // set global pointer to the latest substituted version
        return definegereplaced;
}

char* ReplaceDefine(char* src) {
        glueToProcess = false;
        char* to = sline;
        for (int maxIter = 31; maxIter--;) {
                if (!ReplaceDefineInternal(src, to)) return to;        // no more replacements
                // Some define were replaced, now ping-pong sline <-> sline2 buffers
                src = to;
                to = (sline == to) ? sline2 : sline;
        }
        Error("Unable to finish substitutions, line after last iteration", src, SUPPRESS);
        return src;
}

void SetLastParsedLabel(const char* label) {
        if (LastParsedLabel) free(LastParsedLabel);
        if (nullptr != label) {
                LastParsedLabel = STRDUP(label);
                if (nullptr == LastParsedLabel) ErrorOOM();
                LastParsedLabelLine = CompiledCurrentLine;
        } else {
                LastParsedLabel = nullptr;
                LastParsedLabelLine = 0;
        }
}

void ParseLabel() {
        if (White()) return;
        if (':' == *lp) {                                                        // detect possible SIZEOF boundary tag
                bool isLocal = ('.' == lp[1]);
                if (':' == lp[1 + isLocal]) {                        // tag detected, process it
                        LabelTable.SizeBoundary(isLocal ? CLabelTable::BOUNDARY_LOCAL : CLabelTable::BOUNDARY_MAIN);
                        lp += (2 + isLocal);
                        return;
                }
        }
        if (Options::syx.IsPseudoOpBOF && ParseDirective(true)) {
                if (!SkipBlanks()) Error("Unexpected", lp);
                return;
        }
        char temp[LINEMAX], * tp = temp, * ttp;
        aint val, equPageNum = LABEL_PAGE_UNDEFINED, smcOffset = 0;
        // copy the label name into `temp` array
        while (*lp && !White() && *lp != ':' && *lp != '=' && *lp != '+') {
                *tp = *lp; ++tp; ++lp;
        }
        *tp = 0;
        // handle the special SMC_offset syntax "<label>+<single_digit>"
        if ('+' == lp[0] && isdigit(byte(lp[1])) && !isalnum(byte(lp[2]))) {
                smcOffset = lp[1] - '0';
                lp += 2;
        }
        // handle the special SMC_offset syntax "<label>+*" to target significant immediate of the instruction
        if ('+' == lp[0] && '*' == lp[1] && !isalnum(byte(lp[2]))) {
                assert(!sourcePosStack.empty());
                smcOffset = 1;                                        // heuristic value 1 for first pass or when something fails
                lp += 2;
                if (1 == pass) {
                        // put the current source position into smart-smc (if first pass, or missing record)
                        smartSmcLines.push_back(sourcePosStack.back());
                        smartSmcLines.back().colBegin = ~0U;                // mark as unresolved
                } else {
                        if ((smartSmcLines.size() <= smartSmcIndex)
                                || smartSmcLines.at(smartSmcIndex) != sourcePosStack.back()) {
                                Error("mismatch of smart-SMC positions between passes");
                        } else {
                                auto & smartSmcLine = smartSmcLines.at(smartSmcIndex);
                                if (~0U == smartSmcLine.colBegin) {
                                        Error("unresolved smart-SMC symbol (no significant target)");
                                } else {
                                        smcOffset = smartSmcLine.colBegin;        // use the smart value from previous pass
                                        smartSmcLine.colBegin = ~0U;                // mark as unsolved again
                                }
                        }
                }
                ++smartSmcIndex;
        }
        if (*lp == ':') ++lp;        // eat the optional colon after label
        tp = temp;
        SkipBlanks();
        IsLabelNotFound = false;
        if (isdigit((byte)*tp)) {
                if (smcOffset) {
                        Error("Temporary label can't use SMC-offset");
                        return;
                }
                ttp = tp;
                while (*ttp && isdigit((byte)*ttp)) ++ttp;
                if (*ttp) {
                        Error("Invalid temporary label (not a number)", temp);
                        return;
                }
                if (NeedEQU() || NeedDEFL()) {
                        Error("Number labels are allowed as address labels only, not for DEFL/=/EQU", temp, SUPPRESS);
                        return;
                }
                val = atoi(tp);
                if (!TemporaryLabelTable.InsertRefresh(val)) {
                        Error("Temporary labels flow differs in last pass (missing/new temporary label since previous pass)");
                }
        } else {
                if (isMacroNext()) {
                        if (smcOffset) Error("Macro name can't use SMC-offset");
                        else SetLastParsedLabel(tp);        // store raw label into "last parsed" without adding module/etc
                        return;                                        // and don't add it to labels table at all
                }
                bool IsDEFL = NeedDEFL(), IsEQU = NeedEQU();
                if (IsDEFL || IsEQU) {
                        Relocation::isResultAffected = false;
                        if (!ParseExpressionNoSyntaxError(lp, val)) {
                                Error("Expression error", lp);
                                val = 0;
                        }
                        if (IsLabelNotFound && IsDEFL) Error("Forward reference", NULL, EARLY);
                        // check for explicit page defined by EQU
                        if (IsEQU && comma(lp)) {
                                if (!ParseExpressionNoSyntaxError(lp, equPageNum)) {
                                        Error("Expression error", lp);
                                        equPageNum = LABEL_PAGE_UNDEFINED;
                                }
                        }

                        // after EQU/DEFL expressions there must be <EOL>, anything else is syntax error
                        // this was added in v1.17.1 after realizing the line `label=$+1 and 7`
                        // does evaluate whole "$+1 and 7" as expression, not as instruction `and`
                        // (same problem exists with and/or/xor and if you have macro named after operator)
                        if (!SkipBlanks(lp)) {
                                Error("Unexpected", lp);
                                SkipToEol(lp);
                        }

                } else {
                        int gl = 0;
                        char* p = lp,* n;
                        SkipBlanks(p);
                        if (*p == '@') {
                                ++p; gl = 1;
                        }
                        if ((n = GetID(p)) && StructureTable.Emit(n, tp, p, gl)) {
                                if (smcOffset) Error("Structure instance can't use SMC-offset");
                                lp = p;
                                // this was instancing STRUCT, make it also define "main" label for future "local" ones
                                tp = ValidateLabel(tp, true);
                                if (tp) delete[] tp;
                                return;
                        }
                        val = CurAddress;
                }
                val += smcOffset;
                ttp = tp;
                bool isLocal;
                if (!(tp = ValidateLabel(isLocal, tp, true))) {
                        return;
                }
                // Copy label name to last parsed label variable
                if (!IsDEFL) SetLastParsedLabel(tp);
                unsigned traits = (isLocal ? LABEL_IS_LOCAL : 0) | (IsEQU ? LABEL_IS_EQU : 0) | (IsDEFL ? LABEL_IS_DEFL : 0) | (smcOffset ? LABEL_IS_SMC : 0);
                if (pass == LASTPASS) {
                        SLabelTableEntry* label = LabelTable.Find(tp, true);
                        if (nullptr == label && IsDEFL) {        // DEFL labels can be defined as late as needed (including pass3)
                                if (LabelTable.Insert(tp, val, traits)) label = LabelTable.Find(tp, true);
                        }
                        if (nullptr == label) {                // should have been already defined before last pass
                                Error("Label not found", tp);
                                delete[] tp;
                                return;
                        }
                        if (IsDEFL) {                //re-set DEFL value
                                LabelTable.Insert(tp, val, traits);
                        } else if (IsSldExportActive()) {
                                // SLD (Source Level Debugging) tracing-data logging
                                WriteToSldFile(IsEQU ? equPageNum : label->page, val, IsEQU ? 'D' : 'F', tp);        //version 0
                                WriteToSldFile(IsEQU ? equPageNum : label->page, val, 'L', ExportLabelToSld(ttp, label));        //version 1
                        }

                        if (val != label->value) {
                                // unless special label like DEFL, the values from Pass 2 are intact, just label->updatePass is touched
                                // so in case the value mismatch happens, the CLabelTable::Update is used to fix values for Pass 3 (with warning)
                                static constexpr const int WARNING_HELP_BUFFER_MAX = 128;
                                char buf[WARNING_HELP_BUFFER_MAX];
                                SPRINTF2(buf, WARNING_HELP_BUFFER_MAX, "previous value %u not equal %u", label->value, val);
                                Warning("Label has different value in pass 3", buf);
                                LabelTable.Update(tp, val);
                        } else {
                                label->updatePass = pass;        // just "touch" it here in third pass
                        }
                } else if (pass == 2 && !LabelTable.Insert(tp, val, traits, equPageNum)) {
                        // label already exist, and did NOT need update, ie. duplicate label (could not find other code path to this)
                        if (!LabelTable.Update(tp, val)) assert(false); // unreachable, update will always work after insert failed
                } else if (pass == 1 && !LabelTable.Insert(tp, val, traits, equPageNum)) {
                        Error("Duplicate label", tp, EARLY);
                }
                // sizeof() implementation, must search for inserted label one more time (to do it in every pass)
                SLabelTableEntry* label = LabelTable.Find(tp, true);
                assert(label);
                // soft main/local boundary for current nesting level
                LabelTable.SizeBoundary(isLocal ? CLabelTable::BOUNDARY_LOCAL : CLabelTable::BOUNDARY_MAIN);
                // add new label to size tracking if it has SIZEOF trait
                if (LABEL_HAS_SIZE & label->traits) LabelTable.TrackForSize(label);

// TODO v2.x: this is too complicated in current version: Unreal/Cspect already expect
// EQU/DEFL to be current page or "ROM" = not a big deal as they did change in v1.x course already.
// But also struct labels are set as EQU ones, so this has to split, and many other details.
// (will also need more than LABEL_PAGE_UNDEFINED value to deal with more states)
//                 if (IsEQU && comma(lp)) {        // Device extension: "<label> EQU <address>,<page number>"
//                         if (!DeviceID) {
//                                 Error("EQU can set page to label only in device mode", line);
//                                 SkipToEol(lp);
//                         } else if (!ParseExpression(lp, oval)) {        // try to read page number into "oval"
//                                 Error("Expression error", lp);
//                                 oval = -1;
//                         } else if (oval < 0 || Device->PagesCount <= oval) {
//                                 ErrorInt("Invalid page number", oval);
//                                 oval = -1;
//                         } else {
//                                 if (val < 0 || 0xFFFF < val) Warning("The EQU address is outside of 16bit range", line);
//                                 CLabelTableEntry* equLabel = LabelTable.Find(tp, true);        // must be already defined + found
//                                 equLabel->page = oval;                        // set it's page number
//                         }
//                 }

                delete[] tp;
        }
}

int ParseMacro() {
        int gl = 0, r = 0;
        char* p = lp, *n;
        SkipBlanks(p);
        if (*p == '@') {
                gl = 1; ++p;
        }
        if (!(n = GetID(p))) {
                return 0;
        }

        if (!gl) r = MacroTable.Emit(n, p);                // global '@' operator inhibits macros
        if (r == 2) return 1;        // successfully emitted
        if (r == 1) {                        // error reported
                lp = p;
                return 0;
        }

        // not a macro, see if it's structure
        if (StructureTable.Emit(n, nullptr, p, gl)) {
                lp = p;
                return 1;
        }

        return 0;
}

void ParseInstruction() {
        if ('@' == *lp) ++lp;                // skip single '@', if it was used to inhibit macro expansion
        if (ParseDirective()) return;
        Z80::GetOpCode();
}

static const byte win2dos[] = //taken from HorrorWord %)))
{
        0xB0, 0xB1, 0xB2, 0xB3, 0xB4, 0xB5, 0xB6, 0xB7, 0xB8, 0xB9, 0xBA, 0xBB, 0xBC, 0xBD, 0xBE, 0xBF,
        0xC0, 0xC1, 0xC2, 0xC3, 0xC4, 0xC5, 0xC6, 0xC7, 0xC8, 0xC9, 0xCA, 0xCB, 0xCC, 0xCD, 0xCE, 0xCF,
        0xD0, 0xD1, 0xD2, 0xD3, 0xD4, 0xD5, 0xD6, 0xD7, 0xF0, 0xD8, 0xD9, 0xDA, 0xDB, 0xDC, 0xDD, 0xDE,
        0xDF, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7, 0xF8, 0xF1, 0xF9, 0xFA, 0xFB, 0xFC, 0xFD, 0xFE, 0x20,
        0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8A, 0x8B, 0x8C, 0x8D, 0x8E, 0x8F,
        0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9A, 0x9B, 0x9C, 0x9D, 0x9E, 0x9F,
        0xA0, 0xA1, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, 0xA7, 0xA8, 0xA9, 0xAA, 0xAB, 0xAC, 0xAD, 0xAE, 0xAF,
        0xE0, 0xE1, 0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7, 0xE8, 0xE9, 0xEA, 0xEB, 0xEC, 0xED, 0xEE, 0xEF
};

//#define DEBUG_COUT_PARSE_LINE

// returns 1 when already fully processed (part of DUP/etc)
int PrepareLine() {
        ListSilentOrExternalEmits();

        ++CompiledCurrentLine;
        if (!RepeatStack.empty()) {
                SRepeatStack& dup = RepeatStack.top();
                if (!dup.IsInWork) {
                        lp = line;
                        dup.Pointer->next = new CStringsList(lp);
                        dup.Pointer = dup.Pointer->next;
#ifdef DEBUG_COUT_PARSE_LINE
                        fprintf(stderr, ">%d %d %c%ld-%d [%s]\n", pass, CurSourcePos.line,
                                        (!RepeatStack.empty() && RepeatStack.top().IsInWork ? '!' : '.'),RepeatStack.size(),
                                        (!RepeatStack.empty() ? RepeatStack.top().Level : 0), line);
#endif
                        // check if there's some label at beginning of the line, skip it
                        if (islabchar(*lp)) {
                                // if directives are enabled at beginning of line, check if it is nested DUP/REPT/WHILE/EDUP...
                                if (Options::syx.IsPseudoOpBOF && ParseDirective_REPT()) return 1;
                                // skip label chars and trailing colon
                                while (islabchar(*lp)) ++lp;
                                if (':' == *lp) ++lp;
                        }
                        // catch any nested DUP/WHILE/REPT and EDUP directives
                        ParseDirective_REPT();
                        return 1;
                }
        }
#ifdef DEBUG_COUT_PARSE_LINE
        fprintf(stderr, "|%d %d %c%ld-%d [%s]\n", pass, CurSourcePos.line,
                        (!RepeatStack.empty() && RepeatStack.top().IsInWork ? '!' : '.'), RepeatStack.size(),
                        (!RepeatStack.empty() ? RepeatStack.top().Level : 0), line);
#endif
        lp = ReplaceDefine(line);

#ifdef DEBUG_COUT_PARSE_LINE
        fprintf(stderr,"rdOut [%s]->[%s] %d\n", line, lp, comlin);
#endif

        // update current address by memory wrapping, current page, etc... (before the label is defined)
        if (DeviceID)        Device->CheckPage(CDevice::CHECK_NO_EMIT);
        ListAddress = CurAddress;

        if (!ConvertEncoding) {
                byte* lp2 = (byte*) lp;
                while (*lp2) {
                        if (128 <= *lp2) {
                                *lp2 = win2dos[(*lp2) - 128];
                        }
                        ++lp2;
                }
        }
        return 0;
}

bool PrepareNonBlankMultiLine(char*& p) {
        // loop while the current line is blank-only (read further lines until EOF or non-blank char)
        while (SkipBlanks(p)) {
                // if inside macro system, but without any more macro-lines in buffer, act as if "EOF"
                // (to not leak into reading actual file while the macro is executing)
                if (listmacro && nullptr == lijstp) return false;
                // list the current (old) line
                ListFile();
                // read the next line
                if (!ReadLine()) return false;
                PrepareLine();
                p = lp;
        }
        return true;
}

void ParseLine(bool parselabels) {
        if (PrepareLine()) return;

        if (eolComment && IsSldExportActive()) SldTrackComments();

        if (!*lp) {
                char *srcNonWhiteChar = line;
                SkipBlanks(srcNonWhiteChar);
                // check if only "end-line" comment remained, treat that one as "empty" line too
                if (';' == srcNonWhiteChar[0] || ('/' == srcNonWhiteChar[0] && '/' == srcNonWhiteChar[1]))
                        srcNonWhiteChar = lp;                        // force srcNonWhiteChar to point to 0
                if (*srcNonWhiteChar || comlin) {        // non-empty source line turned into nothing
                        ListFile(true);                                        // or empty source inside comment-block -> "skipped"
                } else {
                        ListFile();                                                // empty source line outside of block-comment -> "normal"
                }
                return;
        }

        if (parselabels) ParseLabel();
        if (!SkipBlanks()) ParseMacro();
        if (!SkipBlanks()) ParseInstruction();
        if (!SkipBlanks()) Error("Unexpected", lp);
        ListFile();
}

void ParseLineSafe(bool parselabels) {
        char* tmp = NULL, * tmp2 = NULL;
        char* rp = lp;
        if (sline[0] > 0) {
                tmp = STRDUP(sline);
                if (tmp == NULL) ErrorOOM();
        }
        if (sline2[0] > 0) {
                tmp2 = STRDUP(sline2);
                if (tmp2 == NULL) ErrorOOM();
        }

        ParseLine(parselabels);

        *sline = 0;
        *sline2 = 0;

        if (tmp2 != NULL) {
                STRCPY(sline2, LINEMAX2, tmp2);
                free(tmp2);
        }
        if (tmp != NULL) {
                STRCPY(sline, LINEMAX2, tmp);
                free(tmp);
        }
        lp = rp;
}

void ParseStructLabel(CStructure* st) {
        char* tp, temp[LINEMAX];
        if (PreviousIsLabel) {
                free(PreviousIsLabel);
                PreviousIsLabel = nullptr;
        }
        if (White()) {
                return;
        }
        tp = temp;
        if (*lp == '.') {
                ++lp;
        }
        while (*lp && islabchar(*lp)) {
                *tp = *lp; ++tp; ++lp;
        }
        *tp = 0;
        if (*lp == ':') {
                ++lp;
        }
        tp = temp; SkipBlanks();
        if (isdigit((byte)*tp)) {
                Error("[STRUCT] Number labels not allowed within structs"); return;
        }
        PreviousIsLabel = STRDUP(tp);
        if (PreviousIsLabel == NULL) ErrorOOM();
        st->AddLabel(tp);
}

void ParseStructMember(CStructure* st) {
        aint val, len;
        bp = lp;
        Relocation::isResultAffected = false;
        Relocation::EType deltaType = Relocation::OFF;
        switch (GetStructMemberId(lp)) {
        case SMEMBBLOCK:
                if (!ParseExpression(lp, len)) {
                        len = 1;
                        Error("[STRUCT] Expression expected");
                }
                if (comma(lp)) {
                        if (!ParseExpression(lp, val)) {
                                val = 0;
                                Error("[STRUCT] Expression expected");
                        }
                        check8(val);
                        val &= 255;
                } else {
                        val = -1;
                }
                st->AddMember(new CStructureEntry2(st->noffset, len, val, deltaType, SMEMBBLOCK));
                break;
        case SMEMBBYTE:
                if (!ParseExpression(lp, val)) val = 0;
                check8(val);
                deltaType = Relocation::isResultAffected ? Relocation::deltaType : Relocation::OFF;
                st->AddMember(new CStructureEntry2(st->noffset, 1, val, deltaType, SMEMBBYTE));
                Relocation::resolveRelocationAffected(INT_MAX, Relocation::HIGH);        // clear flags + warn when can't be relocated
                break;
        case SMEMBWORD:
                if (!ParseExpression(lp, val)) val = 0;
                check16(val);
                deltaType = Relocation::isResultAffected ? Relocation::deltaType : Relocation::OFF;
                st->AddMember(new CStructureEntry2(st->noffset, 2, val, deltaType, SMEMBWORD));
                Relocation::resolveRelocationAffected(INT_MAX);        // clear flags + warn when can't be relocated
                break;
        case SMEMBD24:
                if (!ParseExpression(lp, val)) val = 0;
                check24(val);
                st->AddMember(new CStructureEntry2(st->noffset, 3, val, deltaType, SMEMBD24));
                break;
        case SMEMBDWORD:
                if (!ParseExpression(lp, val)) val = 0;
                st->AddMember(new CStructureEntry2(st->noffset, 4, val, deltaType, SMEMBDWORD));
                break;
        case SMEMBTEXT:
                {
                        if (!ParseExpression(lp, len) || len < 1 || CStructureEntry2::TEXT_MAX_SIZE < len) {
                                Error("[STRUCT] Expression for length of text expected (1..8192)");
                                SkipToEol(lp);
                                break;
                        }
                        byte* textData = new byte[len]();        // zero-initialized for stable binary results
                        if (nullptr == textData) ErrorOOM();
                        if (comma(lp)) {                // if comma then init data array explicitly
                                GetStructText(lp, len, textData);
                        } else if (SkipBlanks(lp)) {
                                // if empty without comma, init with the zeroed values
                        } else {
                                Error("[STRUCT] Comma expected", lp, SUPPRESS);        // syntax error
                        }
                        st->AddMember(new CStructureEntry2(st->noffset, len, textData));
                }
                break;
        case SMEMBALIGN:
        {
                aint val, fill;
                ParseAlignArguments(lp, val, fill);
                if (-1 == val) val = 4;
                if (st->maxAlignment < val) st->maxAlignment = val;        // update structure "max alignment"
                aint bytesToAdvance = (~st->noffset + 1) & (val - 1);
                if (bytesToAdvance < 1) break;                // already aligned, nothing to do
                // create alignment block
                st->AddMember(new CStructureEntry2(st->noffset, bytesToAdvance, fill, deltaType, SMEMBBLOCK));
                break;
        }
        default:
                char* pp = lp,* n;
                int gl = 0;
                CStructure* s;
                SkipBlanks(pp);
                if (*pp == '@') {
                        ++pp;
                        gl = 1;
                }
                if ((n = GetID(pp)) && (s = StructureTable.zoek(n, gl))) {
                        if (st == s) {
                                Error("[STRUCT] Can't include itself", NULL);
                                SkipToEol(pp);
                                lp = pp;
                                break;
                        }
                        if (s->maxAlignment && ((~st->noffset + 1) & (s->maxAlignment - 1))) {
                                // Inserted structure did use ALIGN in definition and it is misaligned here
                                char warnTxt[LINEMAX];
                                SPRINTF3(warnTxt, LINEMAX,
                                                 "Struct %s did use ALIGN %d in definition, but here it is misaligned by %d bytes",
                                                 s->naam, s->maxAlignment, ((~st->noffset + 1) & (s->maxAlignment - 1)));
                                Warning(warnTxt);
                        }
                        lp = pp;
                        st->CopyLabels(s);
                        st->CopyMembers(s, lp);
                }
                break;
        }
        Relocation::checkAndWarn();
}

void ParseStructLine(CStructure* st) {
        ++CompiledCurrentLine;
        lp = ReplaceDefine(line);
        if (!*lp) return;
        ParseStructLabel(st);
        if (SkipBlanks()) return;
        ParseStructMember(st);
        if (SkipBlanks()) return;
        if (*lp) Error("[STRUCT] Unexpected", lp);
}

//eof parser.cpp

z00m128 / sjasmplus / 26128377223

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