! ==============================================================================
!   INFIX:  Support for the optional library debugger extension "Infix".
!
!   Supplied for use with Inform 6 -- Release 6.12.6 -- Serial number 220219
!
!   Copyright Graham Nelson 1993-2004 and David Griffith 2012-2022
!
!   This code is licensed under either the traditional Inform license as
!   described by the DM4 or the Artistic License version 2.0.  See the
!   file COPYING in the distribution archive.
!
!   This file is automatically Included in your game file by "Grammar" if you
!   supply the -X compiler switch.
! ==============================================================================

System_file;

! ------------------------------------------------------------------------------

#Ifdef DEBUG;

Constant INFIXTT_NUMBER          0;
Constant INFIXTT_ARRAY           1;
Constant INFIXTT_ROUTINE         2;
Constant INFIXTT_CONSTANT        3;
Constant INFIXTT_DWORD           4;
Constant INFIXTT_ACTION          5;
Constant INFIXTT_ATTRIBUTE       6;
Constant INFIXTT_PROPERTY        7;
Constant INFIXTT_GLOBAL          8;
Constant INFIXTT_NAMEDOBJECT     9;
Constant INFIXTT_SYSFUN         10;
Constant INFIXTT_STATICSTRING   11;
Constant INFIXTT_LOGICAL        12;

Global infix_term_type;
Global infix_data1;
Global infix_data2;
Global infix_lvalue;
Global infix_parsed_lvalue;
Array  infix_tolowercase -> 256;
#Ifdef VN_1630;
Array  infix_text buffer 126;
#Ifnot;
Array  infix_text -> 128;
#Endif; ! VN_


[ InfixPrintAttribute x; print (string) #attribute_names_array-->x; ];

[ InfixPrintProperty x;  print (property) x; ];

#Ifdef TARGET_GLULX;
[ InfixPrintGIProperty x;  print (property) x; ];
#Endif; ! TARGET_

[ InfixPrintGlobal x;    print (string) #global_names_array-->x; ];

[ InfixPrintAction x;    print (string) #action_names_array-->(x-#lowest_action_number); ];

[ InfixPrintRoutine x;   print (string) #routine_names_array-->(x-#lowest_routine_number); ];

[ InfixPrintConstant x;  print (string) #constant_names_array-->(x-#lowest_constant_number); ];

[ InfixPrintArray x;     print (string) #array_names_array-->(x-#lowest_array_number); ];

[ InfixPrintFakeAction x;
                         print (string) #fake_action_names_array-->(x-#lowest_fake_action_number); ];

[ InfixPrintPA x n;
    for (n=#lowest_routine_number : n<=#highest_routine_number : n++) {
        if (x == Symb__Tab(INFIXTT_ROUTINE, n)) {
            print (InfixPrintRoutine) n; return;
        }
    }
    print "Routine(", x, ")";
];

[ InfixMatchPrule PrintingRule range1 range2 wa wl t i i2 it2 itlc j k plus;
    itlc = infix_tolowercase;
    if (itlc->255 == 0) {
        for (j=0 : j<256 : j++) itlc->j = j;
        itlc->'A' = 'a';    itlc->'B' = 'b';
        itlc->'C' = 'c';    itlc->'D' = 'd';
        itlc->'E' = 'e';    itlc->'F' = 'f';
        itlc->'G' = 'g';    itlc->'H' = 'h';
        itlc->'I' = 'i';    itlc->'J' = 'j';
        itlc->'K' = 'k';    itlc->'L' = 'l';
        itlc->'M' = 'm';    itlc->'N' = 'n';
        itlc->'O' = 'o';    itlc->'P' = 'p';
        itlc->'Q' = 'q';    itlc->'R' = 'r';
        itlc->'S' = 's';    itlc->'T' = 't';
        itlc->'U' = 'u';    itlc->'V' = 'v';
        itlc->'W' = 'w';    itlc->'X' = 'x';
        itlc->'Y' = 'y';    itlc->'Z' = 'z';
    }
    switch (PrintingRule) {
      InfixPrintAttribute:
        if (wa->0 == '~') { wl--; wa++; plus = 100; } ! A tilde
        t = #attribute_names_array;
      InfixPrintProperty:   t = #property_names_array;
      #Ifdef TARGET_GLULX;
      InfixPrintGIProperty: t = #identifiers_table-->2;
      #Endif; ! TARGET_
      InfixPrintAction:     t = #action_names_array;
      InfixPrintFakeAction: t = #fake_action_names_array;
      InfixPrintGlobal:     t = #global_names_array;
      InfixPrintRoutine:    t = #routine_names_array;
      InfixPrintAction:     t = #constant_names_array;
      InfixPrintArray:      t = #array_names_array;
    }

    i2 = range2-range1; it2 = infix_text+WORDSIZE;
    for (i=0 : i<=i2 : i++) {
        #Ifdef TARGET_ZCODE;
        infix_text-->0 = 62; @output_stream 3 infix_text;
        if (t) print (string) t-->i; else PrintingRule(i+range1);
        @output_stream -3;
        #Ifnot; ! TARGET_GLULX
        if (t) PrintToBuffer(infix_text, 62, t-->i);
        else PrintToBuffer(infix_text, 62, PrintingRule, i+range1);
        #Endif; ! TARGET_
        k = infix_text-->0;
        if (k ~= wl) jump XL;
        if (itlc->(it2->0) ~= itlc->(wa->0)) jump XL;
        for (j=1 : j<k : j++)
            if (itlc->(it2->j) ~= itlc->(wa->j)) jump XL;
        parsed_number = i + range1 + plus;
        rtrue;
      .XL;
    }
    rfalse;
];

[ InfixActionToken;
    if (InfixMatchPrule(InfixPrintAction, #lowest_action_number,
        #highest_action_number, WordAddress(wn), WordLength(wn))) {
        wn++; infix_lvalue = parsed_number; return 0;
    }
    if (InfixMatchPrule(InfixPrintFakeAction, #lowest_fake_action_number,
        #highest_fake_action_number, WordAddress(wn), WordLength(wn))) {
        wn++; infix_lvalue = parsed_number; return 0;
    }
    return -1;
];

[ InfixRvalueTerm n w i initial_wn wa wl sign base digit dcount;

    initial_wn = wn;

    infix_parsed_lvalue = -1;
    infix_term_type = INFIXTT_NUMBER;

    w = NextWordStopped();
    if (w == -1) return -1;

    wa = WordAddress(wn-1);
    wl = WordLength(wn-1);
    if (wa->0 == '-' or '$' or '0' or '1' or '2' or '3'
              or '4' or '5' or '6' or '7' or '8' or '9') {
        ! Parse decimal, hex or binary number

        sign = 1; base = 10; dcount = 0;
        if (wa->0 == '-') { sign = -1; wl--; wa++; }
        else {
            if (wa->0 == '$') { base = 16; wl--; wa++; }
            if (wa->0 == '$') { base = 2; wl--; wa++; }
        }
        if (wl == 0) return -1;
        n = 0;
        while (wl > 0) {
            if (wa->0 >= 'a') digit = wa->0 - 'a' + 10;
            else digit = wa->0 - '0';
            dcount++;
            #Ifdef TARGET_ZCODE;
            switch (base) {
              2:
                if (dcount == 17) return -1;
              10:
                if (dcount == 6) return -1;
                if (dcount == 5) {
                    if (n > 3276) return -1;
                    if (n == 3276) {
                        if (sign == 1 && digit > 7) return -1;
                        if (sign == -1 && digit > 8) return -1;
                    }
                }
              16:
                if (dcount == 5) return -1;
            }
            #Ifnot; ! TARGET_GLULX
            switch (base) {
              2:
                if (dcount == 33) return -1;
              10:
                if (dcount == 11) return -1;
                if (dcount == 10) {
                    if (n > 214748363) return -1;
                }
              16:
                if (dcount == 9) return -1;
            }
            #Endif; ! TARGET_
            if (digit >= 0 && digit < base) n = base*n + digit;
            else return -1;
            wl--; wa++;
        }
        parsed_number = n*sign; return 1;
    }

    ! Parse character constant 'a'

    if (wl == 3 && wa->0 == ''' && wa->2 == ''') {
        parsed_number = wa->1; return 1;
    }

    ! ##Action, 'dword'

    switch (w) {
      '##':
        infix_term_type = INFIXTT_ACTION;
        w = NextWordStopped(); if (w == -1) return -1;
        wn--;
        if (InfixActionToken() == 0) return 1;
        return -1;
      '^^':
        infix_term_type = INFIXTT_DWORD;
        w = NextWordStopped(); if (w == -1) return -1;
        parsed_number = w; return 1;
    }

    ! Test for attribute, property, class name, variable name, array name, routine
    ! name, constant name

    wn--;
    if ((wa->0 >= 'a' && wa->0 <= 'z') ||
        (wa->0 >= 'A' && wa->0 <= 'Z') ||
         wa->0 == '_') {


        infix_term_type = INFIXTT_ATTRIBUTE;
        if (InfixMatchPrule(InfixPrintAttribute, #lowest_attribute_number,
            #highest_attribute_number, wa, wl)) {
            wn++; return 1; }

        infix_term_type = INFIXTT_PROPERTY;
        #Ifdef TARGET_ZCODE;
        if (InfixMatchPrule(InfixPrintProperty, #lowest_property_number,
            #highest_property_number, wa, wl)) {
            wn++; return 1;
        }
        #Ifnot; ! TARGET_
        if (InfixMatchPrule(InfixPrintProperty, #lowest_property_number,
            #identifiers_table-->1 - 1, wa, wl)) {
            wn++; return 1;
        }
        if (InfixMatchPrule(InfixPrintGIProperty, INDIV_PROP_START,
            #highest_property_number, wa, wl)) {
            wn++; return 1;
        }
        #Endif; ! TARGET_


        infix_term_type = INFIXTT_GLOBAL;
        if (InfixMatchPrule(InfixPrintGlobal, #lowest_global_number,
            #highest_global_number, wa, wl)) {
            infix_parsed_lvalue = parsed_number-16;
            parsed_number = #globals_array-->infix_parsed_lvalue;
            wn++; return 1;
        }

        infix_term_type = INFIXTT_ARRAY;
        if (InfixMatchPrule(InfixPrintArray, #lowest_array_number,
            #highest_array_number, wa, wl)) {
            infix_parsed_lvalue = parsed_number;
            parsed_number = Symb__Tab(INFIXTT_ARRAY,parsed_number);
            infix_data1 = temp__global3;
            infix_data2 = temp__global2;
            wn++; return 1;
        }

        infix_term_type = INFIXTT_ROUTINE;
        if (InfixMatchPrule(InfixPrintRoutine, #lowest_routine_number,
            #highest_routine_number, wa, wl)) {
            infix_parsed_lvalue = parsed_number;
            parsed_number = Symb__Tab(INFIXTT_ROUTINE,parsed_number);
            infix_data1 = temp__global3;
            infix_data2 = temp__global2;
            wn++; return 1;
        }

        infix_term_type = INFIXTT_CONSTANT;
        if (InfixMatchPrule(InfixPrintConstant, #lowest_constant_number,
            #highest_constant_number, wa, wl)) {
            infix_parsed_lvalue = parsed_number;
            parsed_number = Symb__Tab(INFIXTT_CONSTANT,parsed_number);
            infix_data1 = temp__global3;
            infix_data2 = temp__global2;
            wn++; return 1;
        }

        switch (w) {
          'parent', 'child', 'children',
          'random', 'metaclass', 'sibling':
            parsed_number = w;
            infix_parsed_lvalue = INFIXTT_SYSFUN;
            wn++; return 1;
        }
    }

    infix_term_type = INFIXTT_NAMEDOBJECT;

    wn = initial_wn; i = ParseToken(SCOPE_TT, InfixBigScope);

    if (i == GPR_REPARSE) return i;
    if (i > GPR_MULTIPLE) {
        print "(", (name) i, " (", i, "))^";
        parsed_number = i; return 1;
    }
    return -1;
]; ! end of InfixRvalueTerm

[ InfixBigScope x;
    if (scope_stage == 1) return false;  ! No multiples here
    if (scope_stage == 2) {
        objectloop (x ofclass Object) PlaceInScope(x);
        return true; ! That's the whole scope
    }
    print "; I'm unable to make any sense of that term.^";
];

[ InfixCheckLineSpaced wa wl i force altered;
    for (i=1 : i<=NumberWords() : i++) {
        wa = WordAddress(i);
        wl = WordLength(i);
        if (wl > 3 && wa->0 == ''' && wa->(wl-1) == ''') {
            wa->(wl-1) = ' ';
            if (wa->(wl-2) == '/' && wa->(wl-3) == '/') {
                wa->(wl-2) = ' ';
                wa->(wl-3) = ' ';
            }
            LTI_Insert(wa-buffer, ''');
            LTI_Insert(wa-buffer + 2, ' ');
            altered = true; break;
        }
    }
    for (i=WORDSIZE : i<GetKeyBufLength() + WORDSIZE : i++) {
        #Ifdef TARGET_GLULX;
        buffer->i = LowerCase(buffer->i);
        #Endif; ! TARGET_
        force = false;
        if (buffer->i == '-' && buffer->(i+1) == '-' && buffer->(i+2) == '>')
            force = true;
        if (force) {
            if (i>WORDSIZE && buffer->(i-1) ~= ' ') {
                LTI_Insert(i++, ' '); altered = true;
            }
            if (buffer->(i+3) ~= ' ') {
                LTI_Insert(i+3, ' '); i++; altered = true;
            }
            i = i + 2; continue;
        }

        if (buffer->i == ':' && buffer->(i+1) == ':') force = true;
        if (buffer->i == '-' && buffer->(i+1) == '>') force = true;
        if (buffer->i == '.' && buffer->(i+1) == '&') {
            buffer->i = ']'; force = true;
        }
        if (buffer->i == '.' && buffer->(i+1) == '#') {
            buffer->i = ']'; force = true;
        }
        if (buffer->i == ']' && buffer->(i+1) == '&') force = true;
        if (buffer->i == ']' && buffer->(i+1) == '#') force = true;
        if (buffer->i == '+' && buffer->(i+1) == '+') force = true;
        if (buffer->i == '-' && buffer->(i+1) == '-') force = true;
        if (buffer->i == '&' && buffer->(i+1) == '&') force = true;
        if (buffer->i == '|' && buffer->(i+1) == '|') force = true;
        if (buffer->i == '~' && buffer->(i+1) == '~') force = true;

        if (buffer->i == '=' && buffer->(i+1) == '=') force = true;
        if (buffer->i == '~' && buffer->(i+1) == '=') force = true;
        if (buffer->i == '>' && buffer->(i+1) == '=') force = true;
        if (buffer->i == '<' && buffer->(i+1) == '=') force = true;
        if (buffer->i == '#' && buffer->(i+1) == '#') force = true;

        if (force) {
            if (i > WORDSIZE && buffer->(i-1) ~= ' ') {
                LTI_Insert(i++, ' '); altered = true;
            }
            if (buffer->(i+2) ~= ' ') {
                LTI_Insert(i+2, ' '); i++; altered = true;
            }
            i = i + 1; continue;
        }

        if (buffer->i == '+') force = true;
        if (buffer->i == '-') force = true;
        if (buffer->i == '*') force = true;
        if (buffer->i == '/') force = true;
        if (buffer->i == '%') force = true;
        if (buffer->i == '(') force = true;
        if (buffer->i == ')') force = true;
        if (buffer->i == '<' && buffer->(i-1) ~= ';') force = true;
        if (buffer->i == '>') force = true;
        if (buffer->i == ',') force = true;
        if (buffer->i == '.') force = true;
        if (buffer->i == '&') force = true;
        if (buffer->i == '|') force = true;
        if (buffer->i == '~') force = true;
        if (buffer->i == '=') force = true;
        if (force) {
            if (i > WORDSIZE && buffer->(i-1) ~= ' ') {
                LTI_Insert(i++, ' '); altered = true;
            }
            if (buffer->(i+1) ~= ' ') {
                LTI_Insert(i+1, ' '); i++; altered = true;
            }
        }
    }
    for (i=WORDSIZE : i<GetKeyBufLength() + WORDSIZE : i++)
        if (buffer->i == '~') { buffer->i = '['; altered = true; }
    return altered;
]; ! end of InfixCheckLineSpaced

Array InfixRV_rvals --> 32;
Array InfixRV_lvals --> 32;
Array InfixRV_op --> 32;
Array InfixRV_lop --> 32;
Array InfixRV_rop --> 32;
Array InfixRV_types --> 32;
Array InfixRV_commas --> 32;

[ InfixInBounds addr index n;
    if (addr < #array__start || addr > #array__end)
        rtrue;
    for (n=#lowest_array_number : n<=#highest_array_number : n++) {
        if (addr == Symb__Tab(INFIXTT_ARRAY, n)) {
            if (temp__global3 == 1 or 3)
                temp__global2=temp__global2*WORDSIZE+WORDSIZE-1;
            if (index > temp__global2) {
                print "Array index out of range";
                rfalse;
            }
        }
    }
    rtrue;
];

[ InfixRvalue acc w i n flag base expecting_term max maxi lop rop lvalside
              a b sysfun_f;

    if (InfixCheckLineSpaced()) return GPR_REPARSE;

!   w = wn; for (i=0 : i<10 : i++) { wn = w; InfixRvalueTerm(); print i, "^"; }
!   wn = w;

    expecting_term = true; base = 0;
    do {
        w = NextWordStopped();
        if (expecting_term) {
            switch (w) {
              '-//':
                InfixRV_rvals-->n = 'unary-'; InfixRV_types-->n = base + 8;
              '[//':
                InfixRV_rvals-->n = w; InfixRV_types-->n = base + 6;
              '[[':
                InfixRV_rvals-->n = w; InfixRV_types-->n = base + 2;
              '++':
                InfixRV_rvals-->n = 'pre++'; InfixRV_types-->n = base + 9;
              '--':
                InfixRV_rvals-->n = 'pre--'; InfixRV_types-->n = base + 9;
              '(//':
                InfixRV_rvals-->n = w; InfixRV_types-->n = -3; base=base+100;
              ')//':
                InfixRV_rvals-->n = w; InfixRV_types-->n = -3; base=base-100;
                if (base < 0) { wn--; flag = true; }
              -1:
                flag = true;
              default:
                wn--;
                if (InfixRValueTerm() == 1) {
                    InfixRV_rvals-->n = parsed_number;
                    InfixRV_lvals-->n = infix_parsed_lvalue;
                    InfixRV_types-->n = -1;
                    expecting_term = false;
                }
                else flag = true;
            }
        }
        else {
            expecting_term = true;
            switch (w) {
              comma_word:
                InfixRV_rvals-->n = w; InfixRV_types-->n = base;
              '=//':
                InfixRV_rvals-->n = w; InfixRV_types-->n = base + 1;
              '&&', '||':
                InfixRV_rvals-->n = w; InfixRV_types-->n = base + 2;
              '==', '[=', '>//', '>=', '<//', '<=', 'has', 'hasnt',
              'in', 'notin', 'ofclass', 'provides':
                InfixRV_rvals-->n = w; InfixRV_types-->n = base + 3;
              'or':
                InfixRV_rvals-->n = w; InfixRV_types-->n = base + 4;
              '+//', '-//':
                InfixRV_rvals-->n = w; InfixRV_types-->n = base + 5;
              '*//', '@{2f}//', '%//', '&//', '|//':
                InfixRV_rvals-->n = w; InfixRV_types-->n = base + 6;
              '->', '-->':
                InfixRV_rvals-->n = w; InfixRV_types-->n = base + 7;
              ']&', ']#':
                InfixRV_rvals-->n = w; InfixRV_types-->n = base + 10;
              THEN1__WD:
                InfixRV_rvals-->n = w; InfixRV_types-->n = base + 12;
              '::':
                InfixRV_rvals-->n = w; InfixRV_types-->n = base + 13;
              '(//':
                InfixRV_rvals-->n = '(rcall';
                InfixRV_types-->n = base + 11; base = base + 100;
              ')//':
                InfixRV_rvals-->n = w; InfixRV_types-->n = -3;
                base = base - 100;
                if (base < 0) { wn--; flag = true; }
                expecting_term = false;
              '++':
                InfixRV_rvals-->n = 'post++'; InfixRV_types-->n = base + 9;
                expecting_term = false;
              '--':
                InfixRV_rvals-->n = 'post--'; InfixRV_types-->n = base + 9;
                expecting_term = false;
              default:
                flag = true;
            }
        }
        n++;
    } until (flag || n == 32);
    if (base > 0) return -1;
    n--; if (n == 0) return -1;
    wn--;

    for (i=0 : i<n : i++) {
        acc = 0; if (InfixRV_types-->i ~= -3) acc = InfixRV_rvals-->i;
        InfixRV_op-->i = acc;
    }

    for (::) {

!       for (i=0 : i<n : i++) {
!           if (InfixRV_types-->i == -1) print InfixRV_rvals-->i, " ";
!           else if (InfixRV_types-->i == -3) print " # ";
!           else if (InfixRV_types-->i == -2) print " ## ";
!           else print (address) InfixRV_rvals-->i, "_", InfixRV_types-->i, " ";
!       }
!       new_line;

        max = -2;
        for (i=0 : i<n : i++) if (InfixRV_types-->i > max) {
                            max = InfixRV_types-->i; maxi = i; }
        if (max == -1) { parsed_number = InfixRV_rvals-->maxi; return 1; }

        lop = maxi-1; rop = maxi+1;
        while (lop >= 0 && InfixRV_types-->lop < -1) lop--;
        while (rop < n && InfixRV_types-->rop < -1) rop++;
        if (lop >= 0) InfixRV_lop-->maxi = InfixRV_rvals-->lop;
        if (rop < n) InfixRV_rop-->maxi = InfixRV_rvals-->rop;
        flag = false;
        infix_term_type = INFIXTT_NUMBER;
        switch (InfixRV_rvals-->maxi) {
          comma_word:
            acc = (InfixRV_rvals-->rop);
          '=//', 'pre++', 'post++', 'pre--', 'post--':
            lvalside = lop;
            switch (InfixRV_rvals-->maxi) {
              '=//':        acc = (InfixRV_rvals-->rop);
              'pre++':      acc = (InfixRV_rvals-->rop) + 1; lvalside = rop;
              'pre--':      acc = (InfixRV_rvals-->rop) - 1; lvalside = rop;
              'post++':     acc = (InfixRV_rvals-->lop) + 1;
              'post--':     acc = (InfixRV_rvals-->lop) - 1;
            }
            switch (InfixRV_op-->lvalside) {
              THEN1__WD:
                (InfixRV_lop-->lvalside).(InfixRV_rop-->lvalside) = acc;
              '->':
                if (InfixInBounds(InfixRV_lop-->lvalside, InfixRV_rop-->lvalside))
                    (InfixRV_lop-->lvalside)->(InfixRV_rop-->lvalside) = acc;
              '-->':
                if (InfixInBounds(InfixRV_lop-->lvalside, WORDSIZE * InfixRV_rop-->lvalside))
                    (InfixRV_lop-->lvalside)-->(InfixRV_rop-->lvalside) = acc;
              default:
                w = InfixRV_lvals-->lvalside; if (w == -1) return -1;
                #Ifdef TARGET_ZCODE;
                @storew #globals_array w acc;
                #Ifnot;
                @astore #globals_array w acc;
                #Endif;
            }
            switch(InfixRV_rvals-->maxi) {
              'post++': acc--;
              'post--': acc++;
            }
          '(rcall':
            sysfun_f = false;
            switch (InfixRV_op-->lop) {
              THEN1__WD:
                a = InfixRV_lop-->lop; b = InfixRV_rop-->lop;
              default:
                a = InfixRV_rvals-->lop; b = call;
                if (InfixRV_lvals-->lop == INFIXTT_SYSFUN)
                    sysfun_f = true;
            }
            w = 0;
            i = maxi + 1; base = 100;
            if (InfixRV_types-->i == -1 && InfixRV_rvals-->i == ')//') {
                if (sysfun_f) return -1;
                acc = a.b();
            }
            else {
                while (base > 0) {
                    if (InfixRV_types-->i == -3 && InfixRV_rvals-->i == ')//') base = base - 100;
                    if (InfixRV_types-->i == -3 && InfixRV_rvals-->i == '(//') base = base + 100;
                    if (InfixRV_op-->i == '(rcall') base = base + 100;
                    if (base == 100 && InfixRV_op-->i == comma_word) {
                        InfixRV_commas-->(w++) = i;
!                       print "Comma found at ", i, "^";
                    }
                    i++;
                }
!               print "Num args = ", w + 1, "^";
!               for (i=0 : i<w : i++)
!                   print "arg: ", InfixRV_lop-->(InfixRV_commas-->i), "^";
!               print "arg: ", InfixRV_rvals-->rop, "^";
                switch (w+1) {
                  1:
                    if (sysfun_f) {
                        b = InfixRV_rvals-->rop;
                        infix_term_type = INFIXTT_NAMEDOBJECT;
                        switch(a) {
                          'metaclass':
                            acc = metaclass(b);
                          'parent':
                            acc = parent(b);
                          'child':
                            acc = child(b);
                          'children':
                            acc = children(b);
                            infix_term_type = INFIXTT_NUMBER;
                          'random':
                            acc = random(b);
                            infix_term_type = INFIXTT_NUMBER;
                          'sibling':
                            acc = sibling(b);
                        }
                    }
                    else
                        acc = a.b(InfixRV_rvals-->rop);
                  2:
                    if (sysfun_f) return -1;
                    acc = a.b(InfixRV_lop-->(InfixRV_commas-->0),
                              InfixRV_rvals-->rop);
                  3:
                    if (sysfun_f) return -1;
                    acc = a.b(InfixRV_lop-->(InfixRV_commas-->0),
                              InfixRV_lop-->(InfixRV_commas-->1),
                              InfixRV_rvals-->rop);
                  4:
                    if (sysfun_f) return -1;
                    acc = a.b(InfixRV_lop-->(InfixRV_commas-->0),
                              InfixRV_lop-->(InfixRV_commas-->1),
                              InfixRV_lop-->(InfixRV_commas-->2),
                              InfixRV_rvals-->rop);
                  5:
                    if (sysfun_f) return -1;
                    acc = a.b(InfixRV_lop-->(InfixRV_commas-->0),
                              InfixRV_lop-->(InfixRV_commas-->1),
                              InfixRV_lop-->(InfixRV_commas-->2),
                              InfixRV_lop-->(InfixRV_commas-->3),
                              InfixRV_rvals-->rop);
                  default:
                    return -1;
                }
            }
          '+//':        acc = (InfixRV_rvals-->lop) + (InfixRV_rvals-->rop);
          '-//':        acc = (InfixRV_rvals-->lop) - (InfixRV_rvals-->rop);
          '*//':        acc = (InfixRV_rvals-->lop) * (InfixRV_rvals-->rop);
          '@{2f}//':    acc = (InfixRV_rvals-->lop) / (InfixRV_rvals-->rop);
          '%//':        acc = (InfixRV_rvals-->lop) % (InfixRV_rvals-->rop);
          THEN1__WD:    acc = (InfixRV_rvals-->lop) . (InfixRV_rvals-->rop);
          '->':         acc = (InfixRV_rvals-->lop) -> (InfixRV_rvals-->rop);
          '-->':        acc = (InfixRV_rvals-->lop) --> (InfixRV_rvals-->rop);
          ']&':         acc = (InfixRV_rvals-->lop) .& (InfixRV_rvals-->rop);
          ']#':         acc = (InfixRV_rvals-->lop) .# (InfixRV_rvals-->rop);
          '::':         acc = (InfixRV_rvals-->lop) :: (InfixRV_rvals-->rop);
          '&//':        acc = (InfixRV_rvals-->lop) & (InfixRV_rvals-->rop);
          '|//':        acc = (InfixRV_rvals-->lop) | (InfixRV_rvals-->rop);
          '&&':         acc = (InfixRV_rvals-->lop) && (InfixRV_rvals-->rop);
                        infix_term_type = INFIXTT_LOGICAL;
          '||':         acc = (InfixRV_rvals-->lop) || (InfixRV_rvals-->rop);
                        infix_term_type = INFIXTT_LOGICAL;
          '<//':        acc = (InfixRV_rvals-->lop) < (InfixRV_rvals-->rop);
                        infix_term_type = INFIXTT_LOGICAL;
          '<=':         acc = (InfixRV_rvals-->lop) <= (InfixRV_rvals-->rop);
                        infix_term_type = INFIXTT_LOGICAL;
          '>//':        acc = (InfixRV_rvals-->lop) > (InfixRV_rvals-->rop);
                        infix_term_type = INFIXTT_LOGICAL;
          '>=':         acc = (InfixRV_rvals-->lop) >= (InfixRV_rvals-->rop);
                        infix_term_type = INFIXTT_LOGICAL;
          '==':         acc = (InfixRV_rvals-->lop) == (InfixRV_rvals-->rop);
                        infix_term_type = INFIXTT_LOGICAL;
          '[=':         acc = (InfixRV_rvals-->lop) ~= (InfixRV_rvals-->rop);
                        infix_term_type = INFIXTT_LOGICAL;
          'has':        acc = (InfixRV_rvals-->lop) has (InfixRV_rvals-->rop);
                        infix_term_type = INFIXTT_LOGICAL;
          'hasnt':      acc = (InfixRV_rvals-->lop) hasnt (InfixRV_rvals-->rop);
                        infix_term_type = INFIXTT_LOGICAL;
          'in':         acc = (InfixRV_rvals-->lop) in (InfixRV_rvals-->rop);
                        infix_term_type = INFIXTT_LOGICAL;
          'notin':      acc = (InfixRV_rvals-->lop) notin (InfixRV_rvals-->rop);
                        infix_term_type = INFIXTT_LOGICAL;
          'provides':   acc = (InfixRV_rvals-->lop) provides (InfixRV_rvals-->rop);
                        infix_term_type = INFIXTT_LOGICAL;
          'ofclass':    acc = (InfixRV_rvals-->lop) ofclass (InfixRV_rvals-->rop);
                        infix_term_type = INFIXTT_LOGICAL;
          '[[':         acc = ~~ (InfixRV_rvals-->rop); flag = true;
          '[//':        acc = ~ (InfixRV_rvals-->rop); flag = true;
          'unary-':     acc = - (InfixRV_rvals-->rop); flag = true;
        } ! end of switch(InfixRV_rvals-->maxi)
        InfixRV_rvals-->maxi = acc;
        InfixRV_types-->maxi = -1;
        if (rop < n) InfixRV_types-->rop = -2;
        if (flag == false && lop >= 0) InfixRV_types-->lop = -2;
    } ! end of for (::)
]; ! end of InfixRvalue

! ------------------------------------------------------------------------

[ InfixWelcomeSub;
    print "; Welcome to the ~Infix~ debugger (1/040828), which makes the
        following verbs available:^^
        ~; <expression>~: evaluates this Inform expression: e.g.
        ~; location~ will print the value of the variable ~location~,
        ~; 3*5+1~ will print 16, ~; children(old cloth bag)~ will tell you
        how many items are in it. (You can name objects either by their
        names inside the source code, such as ~d_obj~, or by typing the
        names by which the game's parser would normally know them, such
        as ~floor~: the effect is the same.)^
        Any expression is allowed except that you can't use double-quoted
        strings of text: but you can send messages, call routines or
        assign values to variables, properties and array entries.
        ^   ~; score++~ is one way to get on in the world.
        ^   ~; deadflag = true~ is one way to get out of it.
        ^   ~; StopDaemon(nasty little dwarf)~ will keep you from being pestered.^
        Conditions like ~; score>20~ are also allowed and print
        either 1 (if true) or 0 (if false).^^";
    print "~;examine <something>~ or ~;x <something>~ gives full details
        of whatever it is. For instance, ~;x ##Take~ describes the Take
        action; ~;x Class~ the class Class; ~;x 'drop'~ the dictionary
        word ~drop~ and so on for numbers, routines, arrays and of course
        objects.  ~;xo~ examines something as an object, so for instance
        ~;x location~ tells you about the variable ~location~, but ~;xo
        location~ tells you what object it refers to.^^";
    print "~;give~, ~;remove~ and ~;move~ work like the corresponding
        Inform statements.^^";
    print "~;<~ causes an action: for instance, ~;< Eat cheese~.^^";
    print "~;watch~ or ~;w~ can set a watch on various activities:
        type just ~;w~ for details.^^";
    print "~;inventory~ or ~;i~ describes the contents of this story file.^";
];

[ InfixEvalSub; InfixExamineP(true); ];

[ InfixActionSub;
    print "; <", (InfixPrintAction) infix_lvalue;
    if (noun) print " (", (the) noun, ")";
    if (second) print " (", (the) second, ")";
    print ">^";
    if (second) <<(infix_lvalue) noun second>>;
    if (noun) <<(infix_lvalue) noun>>;
    <<(infix_lvalue)>>;
];

[ InfixGiveSub f t;
    print "; give (", (the) noun, ") ";
    if (second < 0) { second = ~second; f=true; }
    #Ifdef VN_1630;
    t = NUM_ATTR_BYTES * 8;
    #Ifnot;
    t = 48;
    #Endif; ! VN_
    if (second < 0 || second >= t) "<No such attribute>";
    if (f) print "@@126";
    print (DebugAttribute) second;
    #Ifdef TARGET_ZCODE;
    if (f) @clear_attr noun second;
    else   @set_attr noun second;
    #Ifnot; ! TARGET_GLULX
    t = second + 8;
    if (f) @astorebit noun t 0; ! give noun ~second;
    else   @astorebit noun t 1; ! give noun second;
    #Endif; ! TARGET_
    if (t);  ! quell unused n variable warning
    new_line;
];

[ InfixMoveSub;
    print "; move (", (the) noun, ") to (", (the) second, ")^";
    move noun to second;
];

[ InfixRemoveSub;
    print "; remove (", (the) noun, ")^";
    remove noun;
];

[ InfixHex x y;
    #Ifdef TARGET_ZCODE;
    y = (x & $7f00) / $100;
    if (x < 0) y = y + $80;
    #Ifnot; ! TARGET_GLULX
    y = (x & $7f000000) / $1000000;
    if (x < 0) y = y + $80;
    print (Infixhexdigit) y/$10, (Infixhexdigit) y;
    y = x & $ff0000 / $10000;
    print (Infixhexdigit) y/$10, (Infixhexdigit) y;
    y = (x & $ff00) / $100;
    #Endif; ! TARGET_
    x = x & $ff;
    print (Infixhexdigit) y/$10, (Infixhexdigit) y, (Infixhexdigit) x/$10, (Infixhexdigit) x;
];

[ Infixhexdigit x; x = x % $10; if (x < 10) print x; else print (char) 'a'+x-10; ];

[ InfixExamineOSub;
    infix_data1 = metaclass(noun);
    #Ifdef TARGET_GLULX; ! different coding for Glulx
    if (infix_data1 == Object) infix_data1 = 2;
    if (infix_data1 == Class) infix_data1 = 1;
    #Endif; ! TARGET_
    infix_term_type = INFIXTT_CONSTANT;
    InfixExamineP(false);
];

[ InfixExamineSSub;
    infix_term_type = INFIXTT_STATICSTRING;
    InfixExamineP(false);
];

[ InfixExamineSub;     InfixExamineP(false); ];

[ InfixExamineP brief x a b w flag lines;
    switch (infix_term_type) {
      INFIXTT_NUMBER:
        if (brief) "; == ", noun;
        print "; The number ", noun, " == $", (InfixHex) noun;
        if (noun >= 32 && noun < 127) print " == '", (char) noun, "'";
        new_line;
      INFIXTT_NAMEDOBJECT:
        print "~", (name) noun, "~ (", noun, ")^"; if (brief) return;
        <<ShowObj noun>>;
      INFIXTT_CONSTANT:
        if (brief) "; == ", noun;
        switch (infix_data1 & 15) {
            nothing:
                print "; Constant ", (InfixPrintConstant) infix_parsed_lvalue,
                " == ", noun, "^";
            2: <<ShowObj noun>>;
            1:
                print "Class ", (name) noun, "^";
                objectloop (a ofclass noun) {
                    if (flag) print ", "; else print "Contains: ";
                    print (name) a, " (", a, ")"; flag=true;
                }
                if (flag == false) "No object is of this class";
        }
        new_line;
      INFIXTT_ATTRIBUTE:
        if (brief) "; == ", noun;
        if (noun >= 48 || noun < 0) "; No such attribute";
        print "; Attribute ", (InfixPrintAttribute) noun,
            " (numbered ", noun, ")^";
        objectloop (x has noun) {
            if (flag) print ", ";
            else print "Each of these ~has ", (InfixPrintAttribute) noun, "~: ";
            print (name) x, " (", x, ")"; flag = true;
        }
        if (flag == false) "No object ~has ", (InfixPrintAttribute) noun, "~";
        new_line;
      INFIXTT_PROPERTY:
        if (brief) "; == ", noun;
        print "; Property ", (property) noun, " (numbered ", noun, ")^";
        objectloop (x provides noun) {
            if (flag) print ", "; else print "Provided by: ";
            print (name) x, " (", x, ")"; flag = true;
        }
        if (flag == false) "Which is not provided by any object";
        new_line;
      INFIXTT_DWORD:
        if (brief) "; == ", noun;
        if (noun == 0) "; This word is not in the dictionary";
        a = noun->#dict_par1;
        print "; Dictionary word '", (address) noun;
        if (a & 4) print "//p";
        print "' (address ", noun, ")";
        if (a) {
            print ": ";
            if (a & 2)   print "meta ";
            if (a & 1)   print "verb   ";
            if (a & 8)   print "preposition   ";
            if (a & 4)   print "pluralising ";
            if (a & 128) print "noun ";
        }
        new_line;
        if (a & 1) <<ShowVerb noun>>;
      INFIXTT_ROUTINE:
        if (brief) "; == ", noun;
        print "; Routine ", (InfixPrintRoutine) infix_parsed_lvalue, " (number ",
          infix_parsed_lvalue, ", packed address ", noun, ")^";
      INFIXTT_GLOBAL:
        if (brief) "; == ", noun;
        print "; Global ", (InfixPrintGlobal) infix_parsed_lvalue, " == ", noun, "^";
      INFIXTT_ARRAY:
        if (brief) "; == ", noun;
        print "; Array ", (InfixPrintArray) infix_parsed_lvalue, " ";
        infix_data1 = infix_data1 % 16;
        switch (infix_data1) {
          0:    print "->"; a=0;
          1:    print "-->"; a=0;
          2:    print "string"; a=1;
          3:    print "table"; a=1;
          4:    print "buffer"; a=WORDSIZE;
        }
        print " ", infix_data2 + 1 - a, "^; == "; b = infix_data2;
        for (w=b : w>=a : w--)
            if (infix_data1 == 0 or 2 or 4) { if (noun->w) break; }
            else { if (noun-->w) break; }
        if (b-w < 5) w=b;
        for (: x<=w : x++) {
            if (infix_data1 == 0 or 2 or 4) print noun->x, " ";
            else print noun-->x, " ";
            if (x+1 == a) print ": ";
            }
        if (w < b) print "(then ", b-w, " zero entries)";
        new_line;
      INFIXTT_ACTION:
        if (brief) "; == ", noun;
        if (noun >= #lowest_fake_action_number && noun <= #highest_fake_action_number)
           "; Fake action ", (InfixPrintFakeAction) noun,
            " (numbered ", noun, ")^Is not generated by any grammar";
        print "; Action ", (InfixPrintAction) noun,
            " (numbered ", noun, ")^";
        #Ifdef TARGET_ZCODE;
        w = HDR_DICTIONARY-->0;
        for (b=0 : b<(HDR_DICTIONARY-->0 + 5)-->0 : b++) {
            w = HDR_DICTIONARY-->0 + 7 + b*9;
            if ((w->#dict_par1) & 1) {
                a = (HDR_STATICMEMORY-->0)-->($ff-(w->#dict_par2));
                lines = a->0; a++;
                for (: lines>0 : lines--) {
                    a = UnpackGrammarLine(a);
                    if (action_to_be == noun) {
                        print "'", (address) w, "' "; DebugGrammarLine();
                        new_line;
                        flag = true;
                    }
                }
            }
        }
        #Ifnot; ! TARGET_GLULX
        for (b=0 : b < #dictionary_table-->0 : b++) {
            w = #dictionary_table + WORDSIZE + b*(DICT_WORD_SIZE + 7);
            if ((w->#dict_par1) & 1) {
                a = (#grammar_table)-->(DictionaryWordToVerbNum(w) + 1);
                lines = a->0; a++;
                for (: lines>0 : lines--) {
                    a = UnpackGrammarLine(a);
                    if (action_to_be == noun) {
                        print "'", (address) w, "' "; DebugGrammarLine();
                        new_line;
                        flag = true;
                    }
                }
            }
        }
        #Endif; ! TARGET_

        if (flag == 0) "Is not generated by any grammar";
      INFIXTT_SYSFUN:
        if (brief) "; == ", noun;
        "; System function ~", (address) infix_parsed_lvalue, "~ has
        not been overridden by any routine and so has its standard definition.";
      INFIXTT_STATICSTRING:
        if (brief) "; == ", noun;
        if (metaclass(noun) ~= String) "; ", noun, " is not a string.";
        print "~", (string) noun, "~^";
      INFIXTT_LOGICAL:
        if (noun == true) "; true"; if (noun == false) "; false";
        "; ", noun;
    }
    new_line;
]; ! end of InfixExamineP

[ InfixDescribeWatchSub x y z s flag aflag;
    print "; The Infix ~;watch~ verb allows you to set a watch on any named
        routine(s) or objects: for instance ~;watch ScoreSub~ or
        ~;watch silver bars~. You can also:
        ^    ~;watch objects~: changes to attribute or property settings";
    if (debug_flag & 8) print " (on)"; else print " (off)";

    print ";^    ~;watch timers~: the running of timers and daemons each turn";
    if (debug_flag & 4) print " (on)"; else print " (off)";

    print ";^    ~;watch messages~: all messages sent";
    if (debug_flag & 1) print " (on)"; else print " (off)";

    print ";^    ~;watch actions~: all actions generated";
    if (debug_flag & 2) print " (on)"; else print " (off)";

    print ".^~~;watch~ can be abbreviated to ~;w~ and use ~off~ to stop
        watching: for instance ~;w location off~.^";
    aflag = debug_flag;
    objectloop (x has infix__watching) flag = true; aflag = aflag || flag;
    if (flag) print "The following objects are currently being watched: ";
    flag = false;
    objectloop (x has infix__watching) {
        if (flag) print ", "; flag = true;
        print (name) x, " (", x, ")";
    }
    if (flag) new_line;
    s = (#highest_routine_number - #lowest_routine_number);
    if (s%8 == 0) s=s/8; else s=s/8+1;
    for (flag=false,x=0 : x<s : x++) if (#routine_flags_array->x) flag = true;
    aflag = aflag || flag;
    if (flag) print "The following routines are currently being watched: ";
    for (x=0,flag=false : x<s : x++) {
        for (y=1,z=0 : y<256 : z++,y=y*2) {
            if ((#routine_flags_array->x) & y) {
                if (flag) print ", "; flag = true;
                print (InfixPrintRoutine)
                    #lowest_routine_number + x*8 + z;
            }
        }
    }
    if (flag) new_line;
    if (aflag == false) "At present, nothing is being watched.";
];

[ InfixWatchOnSub i j k l;
    if (noun == 0) return InfixDescribeWatchSub();
    if (infix_term_type == INFIXTT_ROUTINE) {
        i = infix_parsed_lvalue/8;
        for (j=0,k=1 : j<infix_parsed_lvalue%8 : j++) k=k*2;
        l = #routine_flags_array->i;
        l = l | k;
        #Ifdef TARGET_ZCODE;
        @storeb #routine_flags_array i l;
        #Ifnot; ! TARGET_GLULX
        @astoreb #routine_flags_array i l;
        #Endif; ! TARGET_
       "; Watching routine ", (InfixPrintRoutine) infix_parsed_lvalue, ".";
    }
    if (metaclass(noun) == Object) {
        give noun infix__watching;
       "; Watching object ~", (name) noun, "~ (", noun, ").";
    }
    InfixDescribeWatchSub();
  ];

[ InfixWatchOffSub i j k l;
    if (noun == 0) return InfixDescribeWatchSub();
    if (infix_term_type == INFIXTT_ROUTINE) {
        i = infix_parsed_lvalue/8;
        for (j=0,k=1 : j<infix_parsed_lvalue%8 : j++) k=k*2;
        l = #routine_flags_array->i;
        l = l & (~k);
        #Ifdef TARGET_ZCODE;
        @storeb #routine_flags_array i l;
        #Ifnot; ! TARGET_GLULX
        @astoreb #routine_flags_array i l;
        #Endif; ! TARGET
       "; Not watching ", (InfixPrintRoutine) infix_parsed_lvalue, ".";
    }
    if (metaclass(noun) == Object) {
        #Ifdef TARGET_ZCODE;
        @clear_attr noun infix__watching;
        #Ifnot; ! TARGET_GLULX
        @astorebit noun (infix__watching+8) 0;
        #Endif; ! TARGET_
       "; Not watching object ~", (name) noun, "~ (", noun, ").";
    }
    InfixDescribeWatchSub();
];

[ InfixList from to tab filter i flag;
    print "^    ";
    for (i=from : i<=to : i++)
        if (tab-->(i-from)) {
            flag = true;
            if (tab == #array_names_array) {
                Symb__Tab(INFIXTT_ARRAY, i);
                flag = ~~(temp__global3 & 16);
            }
            if (tab == #routine_names_array) {
                Symb__Tab(INFIXTT_ROUTINE,i);
                flag = ~~(temp__global3 & 16);
            }
            if (tab == #constant_names_array) {
                Symb__Tab(INFIXTT_CONSTANT,i);
                flag = (~~(temp__global3 & 16)) && (temp__global3 % 16 == filter);
            }
            if (flag) print (string) tab-->(i-from), " ";
        }
        new_line;
];

[ InfixInvSub i;

    print (string) Story, (string) Headline;
    print "  ", (number) #highest_object_number - #lowest_object_number + 1,
        " objects;^";

    print "  non-library object-name constants:";
    InfixList(#lowest_constant_number, #highest_constant_number, #constant_names_array, 2);

    print "  ", (number) #highest_class_number - #lowest_class_number + 1, "  classes:^    ";
    for (i=#lowest_class_number : i<=#highest_class_number : i++)
        print (name) #class_objects_array-->i, " ";
    new_line;

    print "  non-library arrays:";
    InfixList(#lowest_array_number, #highest_array_number, #array_names_array);

    print "  non-library routines:";
    InfixList(#lowest_routine_number, #highest_routine_number, #routine_names_array);

    print "  non-library constants:";
    InfixList(#lowest_constant_number, #highest_constant_number, #constant_names_array, 0);

    print "  (common) properties:";
    #Ifdef TARGET_ZCODE;
    InfixList(#lowest_property_number, INDIV_PROP_START-1, #property_names_array);
    #Ifnot; ! TARGET_GLULX
    InfixList(#lowest_property_number, #identifiers_table-->1 - 1, #property_names_array);
    #Endif; ! TARGET_

    print "  (individual) properties:";
    #Ifdef TARGET_ZCODE;
    InfixList(INDIV_PROP_START, #highest_property_number, #property_names_array + 126);
    #Ifnot; ! TARGET_GLULX
    InfixList(INDIV_PROP_START, #highest_property_number, #identifiers_table-->2);
    #Endif; ! TARGET_

    print "  attributes:";
    InfixList(#lowest_attribute_number, #highest_attribute_number, #attribute_names_array);

    if (true) return;

    print "  variables:";
    InfixList(#lowest_global_number, #highest_global_number, #global_names_array);

    print "  actions:";
    InfixList(#lowest_action_number, #highest_action_number, #action_names_array);

    print "  fake actions:";
    InfixList(#lowest_fake_action_number, #highest_fake_action_number, #fake_action_names_array);
];

Verb meta ';i' ';inv' ';inventory'
    *                                           -> InfixInv;
Verb meta ';x' ';examine'
    * InfixRvalue                               -> InfixExamine;
Verb meta ';xo' ';examineo'
    * InfixRvalue                               -> InfixExamineO;
Verb meta ';xs' ';examines'
    * InfixRvalue                               -> InfixExamineS;
Verb meta ';<'
    * InfixActionToken                          -> InfixAction
    * InfixActionToken InfixRvalue              -> InfixAction
    * InfixActionToken InfixRvalue InfixRvalue  -> InfixAction;
Verb meta ';//'
    *                                           -> InfixWelcome
    * InfixRvalue                               -> InfixEval;
Verb meta ';give'
    * InfixRvalue InfixRvalue                   -> InfixGive;
Verb meta ';move'
    * InfixRvalue "to" InfixRvalue              -> InfixMove;
Verb meta ';remove'
    * InfixRvalue                               -> InfixRemove;
Verb meta ';watch' ';w'
    *                                           -> InfixWatchOn
    * "timers"/"daemons"                        -> TimersOn
    * "timers"/"daemons" "off"                  -> TimersOff
    * "actions"                                 -> ActionsOn
    * "actions" "off"                           -> ActionsOff
    * "messages"                                -> RoutinesOn
    * "messages" "off"                          -> RoutinesOff
    * "objects"                                 -> ChangesOn
    * "objects" "off"                           -> ChangesOff
    * InfixRvalueTerm                           -> InfixWatchOn
    * InfixRvalueTerm "off"                     -> InfixWatchOff;

#Endif; ! DEBUG

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