Hi Kohei, On Tue, Feb 22, 2005 at 23:00:11 -0500, Kohei Yoshida wrote:
> I'm trying to understand the mechanism of cell referencing, and > somehow the two classes ScToken and ScTokeArray seem to be playing a > major role in this. Absolutely, yes. > I have only read a fraction of the relevant code, but it seems to me > that when a formula cell object references another cell that > references another cell that references (...) another cell, instances > of ScToken which are daisy-chained together keep track of their > reference relationship, and another object of ScTokenArray manages > them. > > Is this understanding correct, or am I totally off? Not sure if I understood correctly what you meant by "daisy-chained" and "another object of ScTokenArray manages them". I'll try to put it in a few words how things work: - Each ScFormulaCell has a pointer to one ScTokenArray. - A ScTokenArray contains all ScToken types that represent the formula and are necessary to interpret the formula, amongst them are ScSingleRefToken and ScDoubleRefToken that are cell references. - The cell references are relative offsets and/or absolute positions that point into the document by sheet/column/row numbers addresses. - Using the address a cell is retrieved at that position, which may be another ScFormulaCell, which in turn is interpreted using the ScTokenArray it is pointing to. Does this help, or am I off track now? Eike -- OOo/SO Calc core developer. Number formatter bedevilled I18N transpositionizer. GnuPG key 0x293C05FD: 997A 4C60 CE41 0149 0DB3 9E96 2F1A D073 293C 05FD --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
