Hi everyone (including those who bring this up on wrong irc channels),
Here's a quick overview on what I have in mind for the API to allow the
OOX import component to handle formulas:
1. The cell will have a new interface "XFormulaTokens" or something,
with methods
* sequence<any> getTokenArray()
* void setTokenArray([in] sequence<any> aTokens)
There will be UNO structs for the different token types we have, and
each any will contain one of them.
2. From the document, a new service like "FormulaParser" can be
instantiated, which has an interface with methods
* sequence<any> parseFormula([in] string aFormula)
* string printFormula([in] sequence<any> aTokens)
and properties to control things like reference style, parameter
separators, or possibly a function name replacement list. This is
basically a wrapper around ScCompiler::CompileString and
CreateStringFromTokenArray.
I'll try to flesh this out and make a basic implementation (without
settings beyond what ScCompiler has today) this week, on CWS
xmlfilter02, so it can be used and extended with what's needed for the
filter.
To share formula handling code between xls and xlsx import, I think of
something like this:
xls:
1. Read tokens into API structs
2. Reorder tokens from RPN into "normal" order
3. Do some magic processing
4. Apply the tokens to the cell
xlsx:
1. Read the formula string
2. Use new service to parse into tokens
3. Do some magic processing
4. Apply the tokens to the cell
This would allow step 3 to be shared.
Niklas
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