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Copy pathchunk.cpp
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2984 lines (2824 loc) · 71.3 KB
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/* Copyright (C) 2003-2015 LiveCode Ltd.
This file is part of LiveCode.
LiveCode is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License v3 as published by the Free
Software Foundation.
LiveCode is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with LiveCode. If not see <http://www.gnu.org/licenses/>. */
#include "prefix.h"
#include "globdefs.h"
#include "objdefs.h"
#include "parsedef.h"
#include "filedefs.h"
#include "mcio.h"
#include "scriptpt.h"
#include "execpt.h"
#include "handler.h"
#include "object.h"
#include "dispatch.h"
#include "stack.h"
#include "aclip.h"
#include "vclip.h"
#include "card.h"
#include "group.h"
#include "button.h"
#include "field.h"
#include "image.h"
#include "graphic.h"
#include "eps.h"
#include "scrolbar.h"
#include "player.h"
#include "sellst.h"
#include "stacklst.h"
#include "cardlst.h"
#include "chunk.h"
#include "mcerror.h"
#include "util.h"
#include "debug.h"
#include "globals.h"
MCCRef::MCCRef()
{
etype = otype = ptype = CT_UNDEFINED;
startpos = endpos = NULL;
next = NULL;
}
MCCRef::~MCCRef()
{
delete startpos;
delete endpos;
}
MCChunk::MCChunk(Boolean isforset)
{
url = stack = background = card = group = object = NULL;
cline = item = word = token = character = NULL;
source = NULL;
destvar = NULL;
destobj = NULL;
if (isforset)
desttype = DT_ISDEST;
else
desttype = DT_UNDEFINED;
function = F_UNDEFINED;
marked = False;
next = NULL;
// MW-2014-05-28: [[ Bug 11928 ]] We assume (at first) we are not a transient text chunk (i.e. one that is evaluated from a var).
m_transient_text_chunk = false;
}
MCChunk::~MCChunk()
{
delete url;
while (stack != NULL)
{
MCCRef *tptr = stack;
stack = stack->next;
delete tptr;
}
delete background;
delete card;
while(group != NULL)
{
MCCRef *tptr = group;
group = group->next;
delete tptr;
}
while(object != NULL)
{
MCCRef *tptr = object;
object = object->next;
delete tptr;
}
delete cline;
delete item;
delete word;
delete token;
delete character;
delete source;
delete destvar;
}
Parse_stat MCChunk::parse(MCScriptPoint &sp, Boolean doingthe)
{
Symbol_type type;
Boolean need_target = True;
const LT *te;
MCCRef *curref = NULL;
Chunk_term oterm = CT_UNDEFINED;
Chunk_term nterm = CT_UNDEFINED;
Chunk_term lterm = CT_UNDEFINED;
#ifdef COLLECTING_CHUNKS
MCSyntaxCollector collect(sp, doingthe, desttype == DT_ISDEST);
#endif
initpoint(sp);
while (True)
{
if (sp.next(type) != PS_NORMAL)
if (need_target)
{
MCperror->add(PE_CHUNK_NOCHUNK, sp);
return PS_ERROR;
}
else
break;
if (type == ST_ID)
{
te = NULL;
if (sp.lookup(SP_FACTOR, te) != PS_NORMAL || te->type == TT_PROPERTY)
{
if (need_target)
{
if (desttype == DT_ISDEST && stack == NULL && background == NULL
&& card == NULL && group == NULL && object == NULL)
{
MCExpression *newfact = NULL;
// MW-2011-06-22: [[ SERVER ]] Update to use SP findvar method to take into account
// execution outwith a handler.
if (doingthe
|| sp.findvar(sp.gettoken_nameref(), &destvar) != PS_NORMAL
&& (MCexplicitvariables
|| sp.lookupconstant(&newfact) == PS_NORMAL
|| sp.findnewvar(sp.gettoken_nameref(), kMCEmptyName, &destvar) != PS_NORMAL))
{
delete newfact;
MCperror->add(PE_CHUNK_NOVARIABLE, sp);
return PS_ERROR;
}
destvar->parsearray(sp);
desttype = DT_VARIABLE;
return PS_NORMAL;
}
else
{
if (doingthe)
sp.backup();
sp.backup();
if (sp.parseexp(True, False, &source) != PS_NORMAL)
{
MCperror->add
(PE_CHUNK_BADEXP, sp);
return PS_ERROR;
}
desttype = DT_EXPRESSION;
}
}
else
sp.backup();
break;
}
switch (te->type)
{
case TT_THE:
// MW-2013-01-17: [[ Bug 10644 ]] If we have a string chunk of a property
// then it should be evaluated as a string. However, if the string chunk
// is of a previously parsed object then we must pass as a dest so the
// object resolves correctly.
if (desttype != DT_ISDEST && (cline != NULL || item != NULL
|| word != NULL || token != NULL
|| character != NULL) &&
(stack == nil && background == nil &&
card == nil && group == nil &&
object == nil))
{
sp.backup();
if (sp.parseexp(True, False, &source) != PS_NORMAL)
{
MCperror->add
(PE_CHUNK_BADEXP, sp);
return PS_ERROR;
}
return PS_NORMAL;
}
doingthe = True;
break;
case TT_PREP:
if (need_target)
{
MCperror->add
(PE_CHUNK_BADPREP, sp);
return PS_ERROR;
}
sp.backup();
return PS_NORMAL;
case TT_TO:
if (curref != NULL && lterm >= CT_LINE)
{
if (curref->etype == CT_RANGE)
{
MCperror->add
(PE_CHUNK_BADRANGE, sp);
return PS_ERROR;
}
curref->etype = CT_RANGE;
if (sp.parseexp(False, False, &curref->endpos) != PS_NORMAL)
{
MCperror->add
(PE_CHUNK_NOENDEXP, sp);
return PS_ERROR;
}
}
else
{
sp.backup();
return PS_NORMAL;
}
break;
case TT_IN:
if (!need_target)
{
sp.backup();
return PS_NORMAL;
}
break;
case TT_OF:
need_target = True;
break;
case TT_CLASS:
if (te->which != CT_MARKED)
{
MCperror->add
(PE_CHUNK_NOCHUNK, sp);
return PS_ERROR;
}
marked = True;
break;
case TT_CHUNK:
nterm = (Chunk_term)te->which;
// MW-2013-08-05: [[ ThisMe ]] If 'this' is followed by 'me' we become 'this me'.
if (nterm == CT_THIS &&
sp . skip_token(SP_FACTOR, TT_FUNCTION, F_ME) == PS_NORMAL)
{
// Destination type is 'this me' handled in MCChunk::getobj()
desttype = DT_THIS_ME;
// Destination object is the script being compiled
destobj = sp.getobj();
// Nothing can come after 'this me' so return success.
return PS_NORMAL;
}
switch (ct_class(nterm))
{
case CT_ORDINAL:
oterm = nterm;
break;
case CT_TYPES:
// MW-2011-08-08: [[ Bug ]] Allow control ... of control ...
if (lterm != CT_UNDEFINED && nterm > lterm
|| nterm == lterm && nterm != CT_GROUP && nterm != CT_LAYER && nterm != CT_STACK)
{
MCperror->add(PE_CHUNK_BADORDER, sp);
return PS_ERROR;
}
curref = new MCCRef;
curref->otype = nterm;
if (curref->otype == CT_BACKGROUND || curref->otype == CT_CARD)
{
Symbol_type itype;
const LT *ite;
if (sp.next(itype) == PS_NORMAL)
{
if (sp.lookup(SP_FACTOR, ite) == PS_NORMAL
&& ite->type == TT_CHUNK
&& ite->which >= CT_LAYER && ite->which <= CT_FIELD)
{
curref->ptype = curref->otype;
nterm = curref->otype = (Chunk_term)ite->which;
}
else
sp.backup();
}
}
if (oterm == CT_UNDEFINED)
{
if (sp.skip_token(SP_FACTOR, TT_PROPERTY) == PS_NORMAL)
curref->etype = CT_ID;
else
curref->etype = CT_EXPRESSION;
if (sp.parseexp(curref->otype <= CT_FIELD, False,
&curref->startpos) != PS_NORMAL)
{
MCperror->add(PE_CHUNK_NOSTARTEXP, sp);
delete curref;
return PS_ERROR;
}
}
else
{
curref->etype = oterm;
oterm = CT_UNDEFINED;
}
switch (curref->otype)
{
case CT_URL:
case CT_URL_HEADER:
url = curref;
break;
case CT_TOP_LEVEL:
case CT_MODELESS:
case CT_PALETTE:
case CT_MODAL:
case CT_PULLDOWN:
case CT_POPUP:
case CT_OPTION:
case CT_STACK:
if (oterm > CT_STACK)
{
MCperror->add(PE_CHUNK_BADSTACKREF, sp);
delete curref;
return PS_ERROR;
}
curref->next = stack;
stack = curref;
break;
case CT_BACKGROUND:
background = curref;
break;
case CT_CARD:
card = curref;
break;
case CT_GROUP:
curref->next = group;
group = curref;
break;
case CT_LAYER:
// MW-2011-08-08: [[ Bug ]] Chain 'control' chunks allowing things like 'graphic ... of control ...'
// where the latter chunk refers to a group.
curref->next = object;
object = curref;
break;
case CT_AUDIO_CLIP:
case CT_VIDEO_CLIP:
case CT_MENU:
case CT_BUTTON:
case CT_SCROLLBAR:
case CT_PLAYER:
case CT_IMAGE:
case CT_FIELD:
case CT_GRAPHIC:
case CT_EPS:
case CT_COLOR_PALETTE:
case CT_MAGNIFY:
object = curref;
break;
case CT_LINE:
cline = curref;
break;
case CT_ITEM:
item = curref;
break;
case CT_WORD:
word = curref;
break;
case CT_TOKEN:
token = curref;
break;
case CT_CHARACTER:
character = curref;
break;
default: /* curref->otype */
fprintf(stderr, "MCChunk: ERROR bad chunk type %d\n", nterm);
break;
}
if (nterm < CT_LINE)
need_target = False;
lterm = nterm;
break;
default: /* chunk class */
MCperror->add(PE_CHUNK_BADCHUNK, sp);
return PS_ERROR;
}
doingthe = False;
break;
case TT_FUNCTION:
function = (Functions)te->which;
switch (function)
{
case F_CLICK_CHUNK:
case F_CLICK_CHAR_CHUNK:
case F_CLICK_FIELD:
case F_CLICK_LINE:
case F_CLICK_TEXT:
case F_FOUND_CHUNK:
case F_FOUND_FIELD:
case F_FOUND_LINE:
case F_FOUND_TEXT:
case F_SELECTED_CHUNK:
case F_SELECTED_FIELD:
case F_SELECTED_IMAGE:
case F_SELECTED_LINE:
case F_SELECTED_TEXT:
case F_MOUSE_CONTROL:
case F_MOUSE_CHUNK:
case F_MOUSE_CHAR_CHUNK:
case F_MOUSE_LINE:
case F_MOUSE_TEXT:
case F_DRAG_SOURCE:
case F_DRAG_DESTINATION:
case F_FOCUSED_OBJECT:
if (desttype == DT_ISDEST)
{ // delete the selectedLine of field x
if (function == F_SELECTED_LINE || function == F_SELECTED_CHUNK)
{}
}
else if (cline != NULL || item != NULL || word != NULL
|| token != NULL || character != NULL)
{
sp.backup();
if (sp.parseexp(True, False, &source) != PS_NORMAL)
{
MCperror->add(PE_CHUNK_BADEXP, sp);
return PS_ERROR;
}
return PS_NORMAL;
}
desttype = DT_FUNCTION;
break;
case F_ME:
desttype = DT_ME;
destobj = sp.getobj();
break;
case F_MENU_OBJECT:
desttype = DT_MENU_OBJECT;
break;
case F_TARGET:
desttype = DT_TARGET;
break;
// MW-2008-11-05: [[ Owner Reference ]] If we encounter 'the owner of ...' then
// parse the syntax as:
// 'the' owner [ 'of' ] <chunk>
// owner 'of' <chunk>
case F_OWNER:
desttype = DT_OWNER;
if (sp . skip_token(SP_FACTOR, TT_OF) != PS_NORMAL && !doingthe)
{
MCperror -> add(PE_PROPERTY_NOTOF, sp);
return PS_ERROR;
}
source = new MCChunk(False);
if (static_cast<MCChunk *>(source) -> parse(sp, False) != PS_NORMAL)
{
MCperror->add(PE_PROPERTY_BADCHUNK, sp);
return PS_ERROR;
}
return PS_NORMAL;
case F_TEMPLATE_STACK:
case F_TEMPLATE_AUDIO_CLIP:
case F_TEMPLATE_VIDEO_CLIP:
case F_TEMPLATE_GROUP:
case F_TEMPLATE_CARD:
case F_TEMPLATE_BUTTON:
case F_TEMPLATE_FIELD:
case F_TEMPLATE_IMAGE:
case F_TEMPLATE_SCROLLBAR:
case F_TEMPLATE_PLAYER:
case F_TEMPLATE_GRAPHIC:
case F_TEMPLATE_EPS:
desttype = (Dest_type)(te->which - F_TEMPLATE_BUTTON + DT_BUTTON);
break;
case F_SELECTED_OBJECT:
desttype = DT_SELECTED;
break;
case F_TOP_STACK:
desttype = DT_TOP_STACK;
break;
case F_CLICK_STACK:
desttype = DT_CLICK_STACK;
break;
case F_MOUSE_STACK:
desttype = DT_MOUSE_STACK;
break;
default: /* function */
if (need_target && desttype != DT_ISDEST)
{
if (doingthe)
sp.backup();
sp.backup();
if (sp.parseexp(True, False, &source) != PS_NORMAL)
{
MCperror->add(PE_CHUNK_BADEXP, sp);
return PS_ERROR;
}
// MW-2013-06-20: [[ Bug 10966 ]] Make sure we mark the chunk as being of
// 'expression' type. This means 'source' will be evaluated and then parsed
// as a control reference in 'getobj()' context. This has wider implications
// that just 'controlAtLoc()' - it means any function used on the rhs of
// 'of' for properties will now function correctly.
desttype = DT_EXPRESSION;
return PS_NORMAL;
}
else
{
sp.backup();
if (need_target)
return PS_ERROR;
return PS_NORMAL;
}
}
if (sp.skip_token(SP_FACTOR, TT_LPAREN) == PS_NORMAL)
if (sp.skip_token(SP_FACTOR, TT_RPAREN) != PS_NORMAL)
{
MCperror->add
(PE_CHUNK_BADEXP, sp);
return PS_ERROR;
}
return PS_NORMAL;
default: /* factor */
if (need_target)
{
if (stack != NULL || background != NULL || card != NULL
|| group != NULL || object != NULL)
{
MCperror->add
(PE_CHUNK_NOCHUNK, sp);
return PS_ERROR;
}
if (desttype != DT_UNDEFINED)
{
MCperror->add
(PE_CHUNK_BADDEST, sp);
return PS_ERROR;
}
if (doingthe)
sp.backup();
sp.backup();
if (sp.parseexp(True, False, &source) != PS_NORMAL)
{
MCperror->add(PE_CHUNK_BADEXP, sp);
return PS_ERROR;
}
}
else
sp.backup();
return PS_NORMAL;
}
}
else
{ /* token type != ST_ID */
if (need_target)
{
if (stack != NULL || background != NULL || card != NULL
|| group != NULL || object != NULL)
{
MCperror->add(PE_CHUNK_NOCHUNK, sp);
return PS_ERROR;
}
if (desttype != DT_UNDEFINED)
{
MCperror->add(PE_CHUNK_BADDEST, sp);
return PS_ERROR;
}
sp.backup();
if (sp.parseexp(True, True, &source) != PS_NORMAL)
{
MCperror->add(PE_CHUNK_BADEXP, sp);
return PS_ERROR;
}
// MW-2007-07-03: [[ Bug 1925 ]] We have just parsed an expression so set
// the desttype appropriately. This means things such as the foo of (...)
// works correctly.
desttype = DT_EXPRESSION;
}
else
sp.backup();
break;
}
}
return PS_NORMAL;
}
MCVarref *MCChunk::getrootvarref(void)
{
if (destvar != NULL)
return destvar;
if (source != NULL)
return source -> getrootvarref();
return NULL;
}
void MCChunk::take_components(MCChunk *tchunk)
{
if (tchunk->character != NULL)
{
delete character;
character = tchunk->character;
tchunk->character = NULL;
}
if (tchunk->token != NULL)
{
delete token;
token = tchunk->token;
tchunk->token = NULL;
}
if (tchunk->word != NULL)
{
delete word;
word = tchunk->word;
tchunk->word = NULL;
}
if (tchunk->item != NULL)
{
delete item;
item = tchunk->item;
tchunk->item = NULL;
}
if (tchunk->cline != NULL)
{
delete cline;
cline = tchunk->cline;
tchunk->cline = NULL;
}
// MW-2014-05-28: [[ Bug 11928 ]] As soon as we take components from a chunk then
// mark us as transient text, so that we don't use the same components next time.
m_transient_text_chunk = true;
}
Exec_stat MCChunk::getobj(MCExecPoint &ep, MCObject *&objptr,
uint4 &parid, Boolean recurse)
{
objptr = NULL;
parid = 0;
MCStack *sptr = MCdefaultstackptr;
MCGroup *bptr = NULL;
MCCard *cptr = NULL;
MCGroup *gptr = NULL;
MCExecPoint ep2(ep);
if (desttype != DT_UNDEFINED && desttype != DT_ISDEST)
{
Exec_stat stat = ES_ERROR;
switch (desttype)
{
case DT_EXPRESSION:
case DT_VARIABLE:
if (recurse)
{
if (desttype == DT_EXPRESSION)
{
if (source->eval(ep2) != ES_NORMAL)
{
MCeerror->add(EE_CHUNK_BADOBJECTEXP, line, pos);
return ES_ERROR;
}
}
else
{
if (destvar->eval(ep2) != ES_NORMAL)
{
MCeerror->add(EE_CHUNK_BADOBJECTEXP, line, pos);
return ES_ERROR;
}
}
MCScriptPoint sp(ep2);
MCChunk *tchunk = new MCChunk(False);
MCerrorlock++;
Symbol_type type;
if (tchunk->parse(sp, False) == PS_NORMAL
&& sp.next(type) == PS_EOF)
stat = ES_NORMAL;
MCerrorlock--;
if (stat == ES_NORMAL)
stat = tchunk->getobj(ep2, objptr, parid, False);
if (stat == ES_NORMAL)
take_components(tchunk);
delete tchunk;
}
if (stat != ES_NORMAL)
{
MCeerror->add
(EE_CHUNK_BADOBJECTEXP, line, pos, ep2.getsvalue());
return ES_ERROR;
}
break;
case DT_ME:
// MW-2009-01-28: [[ Inherited parentScripts ]]
// If we are executing in the context of a parent-handle invocation
// (indicated by getparentscript() of the EP being non-NULL) 'me'
// refers to the derived object context, otherwise it is the object
// we were compiled in.
if (ep.getparentscript() == NULL)
objptr = destobj;
else
objptr = ep . getobj();
break;
// MW-2013-08-05: [[ ThisMe ]] 'this me' is the object of the script
// currently being executed, so it is always the object the script
// was compiled into.
case DT_THIS_ME:
objptr = destobj;
break;
case DT_MENU_OBJECT:
objptr = MCmenuobjectptr;
break;
case DT_TARGET:
objptr = MCtargetptr;
break;
// MW-2008-11-05: [[ Owner Reference ]] If the desttype is DT_OWNER it means that <source>
// must point to an MCChunk object (as that's how its parsed).
// In this case attempt to evaluate it and then step up one in the ownership chain. Note
// that we can't step higher than a mainstack, so we set objptr to NULL in this case.
case DT_OWNER:
if (static_cast<MCChunk *>(source) -> getobj(ep2, objptr, parid, True) != ES_NORMAL)
{
MCeerror -> add(EE_CHUNK_BADOBJECTEXP, line, pos);
return ES_ERROR;
}
if (objptr -> gettype() == CT_STACK && MCdispatcher -> ismainstack(static_cast<MCStack *>(objptr)))
objptr = NULL;
else
objptr = objptr -> getparent();
break;
case DT_STACK:
objptr = MCtemplatestack;
return ES_NORMAL;
case DT_AUDIO_CLIP:
objptr = MCtemplateaudio;
return ES_NORMAL;
case DT_VIDEO_CLIP:
objptr = MCtemplatevideo;
return ES_NORMAL;
case DT_GROUP:
objptr = MCtemplategroup;
return ES_NORMAL;
case DT_CARD:
objptr = MCtemplatecard;
return ES_NORMAL;
case DT_BUTTON:
objptr = MCtemplatebutton;
return ES_NORMAL;
case DT_FIELD:
objptr = MCtemplatefield;
return ES_NORMAL;
case DT_IMAGE:
objptr = MCtemplateimage;
return ES_NORMAL;
case DT_SCROLLBAR:
objptr = MCtemplatescrollbar;
return ES_NORMAL;
case DT_PLAYER:
objptr = MCtemplateplayer;
return ES_NORMAL;
case DT_GRAPHIC:
objptr = MCtemplategraphic;
return ES_NORMAL;
case DT_EPS:
objptr = MCtemplateeps;
return ES_NORMAL;
case DT_ERROR:
objptr = MCerrorptr;
break;
case DT_SELECTED:
objptr = MCselected->getfirst();
break;
case DT_TOP_STACK:
objptr = MCtopstackptr;
break;
case DT_CLICK_STACK:
objptr = MCclickstackptr;
break;
case DT_MOUSE_STACK:
objptr = MCmousestackptr;
break;
case DT_FUNCTION:
switch (function)
{
case F_CLICK_CHUNK:
case F_CLICK_CHAR_CHUNK:
case F_CLICK_FIELD:
case F_CLICK_LINE:
case F_CLICK_TEXT:
objptr = MCclickfield;
break;
case F_SELECTED_CHUNK:
case F_SELECTED_FIELD:
case F_SELECTED_LINE:
case F_SELECTED_TEXT:
objptr = MCactivefield;
break;
case F_SELECTED_IMAGE:
objptr = MCactiveimage;
break;
case F_FOUND_CHUNK:
case F_FOUND_FIELD:
case F_FOUND_LINE:
case F_FOUND_TEXT:
objptr = MCfoundfield;
break;
case F_MOUSE_CONTROL:
case F_MOUSE_CHUNK:
case F_MOUSE_CHAR_CHUNK:
case F_MOUSE_LINE:
case F_MOUSE_TEXT:
// OK-2009-01-19: Refactored to ensure behaviour is the same as the mouseControl.
if (MCmousestackptr != NULL)
objptr = MCmousestackptr->getcard()->getmousecontrol();
else
objptr = NULL;
break;
case F_FOCUSED_OBJECT:
objptr = MCdefaultstackptr->getcard()->getkfocused();
if (objptr == NULL)
objptr = MCdefaultstackptr->getcard();
break;
case F_DRAG_SOURCE:
objptr = MCdragsource;
break;
case F_DRAG_DESTINATION:
objptr = MCdragdest;
break;
default:
objptr = NULL;
break;
}
break;
default:
objptr = NULL;
break;
}
if (objptr == NULL)
{
MCeerror->add(EE_CHUNK_NOTARGET, line, pos);
return ES_ERROR;
}
switch (objptr->gettype())
{
case CT_STACK:
sptr = (MCStack *)objptr;
break;
case CT_CARD:
cptr = (MCCard *)objptr;
sptr = cptr->getstack();
break;
case CT_GROUP:
bptr = gptr = (MCGroup *)objptr;
cptr = gptr->getcard();
sptr = cptr->getstack();
break;
case CT_AUDIO_CLIP:
case CT_VIDEO_CLIP:
case CT_LAYER:
case CT_MENU:
case CT_BUTTON:
case CT_IMAGE:
case CT_FIELD:
case CT_GRAPHIC:
case CT_EPS:
case CT_SCROLLBAR:
case CT_PLAYER:
case CT_MAGNIFY:
case CT_COLOR_PALETTE:
MCCard *t_card;
t_card = objptr -> getcard(parid);
if (t_card == NULL)
return ES_ERROR;
parid = t_card -> getid();
return ES_NORMAL;
default:
break;
}
}
else
if (stack == NULL && background == NULL && card == NULL
&& group == NULL && object == NULL)
return ES_ERROR;
else
if (url != NULL)
{
uint4 offset;
if (MCU_offset(SIGNATURE, ep.getsvalue(), offset) && (ep . getsvalue() . getlength() > 8 && strncmp(ep . getsvalue() . getstring(), "REVO", 4) == 0))
{
IO_handle stream = MCS_fakeopen(ep.getsvalue());
if (MCdispatcher->readfile(NULL, NULL, stream, sptr) != IO_NORMAL)
{
MCS_close(stream);
return ES_ERROR;
}
MCS_close(stream);
}
else
return ES_ERROR;
}
else
sptr = MCdefaultstackptr;
if (stack != NULL)
{
switch (stack->etype)
{
case CT_EXPRESSION:
case CT_ID:
if (stack->startpos->eval(ep2) != ES_NORMAL)
{
MCeerror->add(EE_CHUNK_BADSTACKEXP, line, pos);
return ES_ERROR;
}
if (stack->etype == CT_ID)
sptr = sptr->findstackid(ep2.getuint4());
else
sptr = sptr->findstackname(ep2.getsvalue());
break;
case CT_THIS:
break;
default:
MCeerror->add(EE_CHUNK_BADSTACKEXP, line, pos);
return ES_ERROR;
}
if (sptr != NULL && stack->next != NULL)
{
switch (stack->next->etype)
{
case CT_EXPRESSION:
case CT_ID:
if (stack->next->startpos->eval(ep2) != ES_NORMAL)
{
MCeerror->add(EE_CHUNK_BADSTACKEXP, line, pos);
return ES_ERROR;
}
if (stack->next->etype == CT_ID)
sptr = sptr->findsubstackid(ep2.getuint4());
else
sptr = sptr->findsubstackname(ep2.getsvalue());
break;
case CT_THIS:
break;
default:
MCeerror->add(EE_CHUNK_BADSTACKEXP, line, pos);
return ES_ERROR;
}
}
}
if (sptr == NULL)
{
MCeerror->add(EE_CHUNK_NOSTACK, line, pos);
return ES_ERROR;
}
if (object != NULL && (object->otype == CT_AUDIO_CLIP || object->otype == CT_VIDEO_CLIP))
{
if (ct_class(object->etype) == CT_ORDINAL)
objptr = sptr->getAV(object->etype, MCnullmcstring, object->otype);
else
{
if (object->startpos->eval(ep2) != ES_NORMAL)
{
MCeerror->add(EE_CHUNK_BADOBJECTEXP, line, pos);
return ES_ERROR;
}
objptr = sptr->getAV(object->etype, ep2.getsvalue(), object->otype);
if (objptr == NULL)
objptr = sptr->getobjname(object->otype, ep2.getsvalue());
}
if (objptr == NULL)
{
// Lookup the name we are searching for. If it doesn't exist, then no object can
// have it as a name.
MCNameRef t_obj_name;
t_obj_name = MCNameLookupWithOldString(ep2.getsvalue(), kMCCompareCaseless);
if (t_obj_name != nil)
{
if (object->otype == CT_VIDEO_CLIP)