/*
the big main central interpreter loop.
processes return codes from eval().
0 indicate noerror
yieldtocaller indicates `showpage` has been called using SHOWPAGE_RETURN semantics.
ioblock indicates a blocked io operation.
contextswitch indicates the `yield` operator has been called.
all other values indicate an error condition to be returned to postscript.
*/
int mainloop(Xpost_Context *ctx)
{
int ret;
ctxswitch:
xpost_ctx = ctx = _switch_context(ctx);
itpdata->cid = ctx->id;
while(!ctx->quit)
{
ret = eval(ctx);
if (ret)
switch (ret)
{
case yieldtocaller:
return 1;
case ioblock:
ctx->state = C_IOBLOCK; /* fallthrough */
case contextswitch:
goto ctxswitch;
default:
_onerror(ctx, ret);
}
}
return 0;
}
void ConfigTree::error(const std::string& message) const
{
_onerror(_filename, _path, message);
std::abort();
}
