https://github.com/i-e-b/dbss

[Working] A toy spread-sheet engine using SQL for backing
https://github.com/i-e-b/dbss

c-sharp database experimental spreadsheet working

Last synced: 2 months ago
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[Working] A toy spread-sheet engine using SQL for backing

• Host: GitHub
• URL: https://github.com/i-e-b/dbss
• Owner: i-e-b
• License: bsd-3-clause
• Created: 2011-10-22T18:59:49.000Z (over 13 years ago)
• Default Branch: master
• Last Pushed: 2018-12-18T08:10:31.000Z (over 6 years ago)
• Last Synced: 2025-01-27T12:11:18.641Z (4 months ago)
• Topics: c-sharp, database, experimental, spreadsheet, working
• Language: C#
• Homepage:
• Size: 52.7 KB
• Stars: 2
• Watchers: 3
• Forks: 1
• Open Issues: 0
• Metadata Files:
  • Readme: README
  • License: LICENSE

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README

        
DBSS

====

A toy spread-sheet engine with SQL backing

Each cell can have a name, a value and a formula.

Names hide but don't overwrite formulas and values (like giving a function or constant a name)

Formulae update values based on calculations

Values are values.

Formulae DON'T start in '=' (this isn't Excel!)

Formulae are infix, support functions and scientific notation of large numbers.

Functions are nestable.

Operators:

	+  add

	-  substract

	*  multiply

	/  divide

	^  exponent

	%  modulo

	!  

	

Constants defined: (case insensitive)

	pi - Value of π

	e  - Value of e

	R  - Row (Y-value) of current cell

	C  - Column (X-value) of current cell

	

Functions defined: (case insensitive)

LOOKUP functions (co-ords are absolute. To get relative co-ordinates, do like "$(C,R-1)")

	$(x,y)  - value of cell at co-ordinates given

	$f(x,y) - function string of cell at co-ordinates given

	$n(x,y) - name of cell at co-ordinates given

	

	floor(x) - integer value from floor of float

	ceil(x)  - integer value from ceiling of float

	sqrt(x)  - square root of x

	cos(x)   - Cosine of x

	sin(x)   - Sine of x

	sign(x)  - *ve sign of x (-1, 0, 1)

TODO

----

 - More common functions

 - Lookup by cell name

 - Lookup by truth-table (1D and 2D to start with, possible reduction sets for 3+D)

 - Colour code cells by what fields are populated.

 - Use named cells as functions in formulae