further development on Teapot, a three-dimensional, function-oriented spreadsheet with iterative updates, written by Michael Haardt and Jörg Walter, from V 2.3.0 posted 2012 Feb 6.
364ef2c0ea
The primary change is to add a “funcall” token, so that an entire expression can be encapsulated as a single token. This change is used to allow a cell to include simply a selection of appropriate semantic tokens. I.e., the content and iterative content are now each a single token like the value and the result value. Token vectors are used only as intermediate results in scanning and parsing. Not this means the cells are now in effect storing parse trees, so computation should be slightly faster and future extensions (like #56) should be facilitated. This commit also takes the opportunity while internals are being altered to add another token to a cell for future use for computed attributes, cf #22, and to change the internal numerical values from double and ints to long doubles and long longs. However, the change attempts to encapsulate that choice so it would be easy to change back or change to another representation. Note that these changes break savexdr(), as the internal binary format of a cell is now different. Rather than reimplement it, it is deprecated as the world does not need another binary spreadsheet format. Hence, the ascii format for teapot spreadsheets becomes the primary file format. Loading of old xdr files is still supported for backward compatibility. Closes #59. Also along the way, various other slight fixes and enhancements crept in, a partial but probably not exhaustive list of which follows: Fixes #31. Further revisions and improvements to documentation. Make the approximate comparison of floating point values scale more accurately with the size of the doubles being compared. Further extensions of absolute and relative cell addressing. Addition of (circle constant) tau function/constant. Modified string conversion to simply use internal printing routines, and to take "scientific" and "decimal" keywords. Allowed n() function to take a list of values, or just a single location defaulting to the current location. Added floor, ceil, trunc, and round functions, and allowed them to be keywords controlling the int() integer conversion function as well. Allowed substr() to drop its last argument to go to the end of the string. Provided an enum of built-in functions to preserve legacy function identifiers, allowing the large table inside func.c to be reorganized in a clearer fashion. Added additional annotation of properties of the built-in functions, including precedence. All operators are now also accessible as built-in functions. Made precedence of unary - lower than ^ to match python. Avoided inadvertently using FLTK @symbol abbreviations for formulas with "@" in them. |
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| README.md | ||
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README.md
teapot-spreadsheet
This project represents further development on Teapot, a three-dimensional, function-oriented spreadsheet with iterative updates, written by Michael Haardt and Jörg Walter, from V 2.3.0 posted 2012 Feb 6.
This is a development version following release 2.3.0 of teapot (Table Editor And Planner, Or: Teapot), a spread sheet program for UNIX.
Copyright (C) 1995-2006 Michael Haardt
Copyright (C) 2009-2012 Joerg Walter
Copyright (C) 2019 Glen Whitney
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
The current release has the following features:
- curses based user interface with easy to understand menus
- FLTK 1.3 based GUI following common user interface conventions
- Cross-platform compatibility
- UTF-8 support
- portable sheet file format uses XDR or ASCII format
- tbl, LaTeX, HTML, CSV or formatted text files can be generated and simple SC and WK1 sheets can be imported
- typed expression evaluator with the types int, float, string, error, pointer to cell and empty
- iterative expressions
- powerful cell addressing
- three-dimensional sheets
- new expression evaluator functions can be added very easy
- a user guide, available as PDF and HTML
- It is still a small and simple program!
teapot should work on any system which supports the following:
- ANSI C
- An XDR library (included in the GNU C library, otherwise use http://people.redhat.com/~rjones/portablexdr/ )
- For the text interface: SYSV curses or ncurses library
- For UTF-8 in the text interface: libncursesw and a UTF-8 locale
- For the FLTK interface: C++
- For the FLTK interface: FLTK 1.3
A GNU zipped tar file of the prior release V 2.3.0 is available from:
http://www.syntax-k.de/projekte/teapot/
This development version is hosted at https://code.studioinfinity.org/glen/teapot-spreadsheet.
For more information, read the included manual in HTML or PDF format.