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https://issues.apache.org/jira/browse/MATH-192?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12570417#action_12570417
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Axel Kramer commented on MATH-192:
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> Phil Steitz - 17/Feb/08 09:30 AM
> I am +1 for incorporating something based on this, assuming
> 1) The code can be contributed under ASL (see
> http://www.apache.org/licenses/#clas)
> 2) There is sufficient community interest to ready it for release / maintain
> it
>
> Assuming yes to 1), we need to go through the incubator IP clearance process.
> Not a big deal. The important thing is to make sure that the code is
> unencumbered. Luc or I can handle that.
Thanks for your help.
Some parts of the parser are derived from the
http://sourceforge.net/projects/hartmath project.
The author allowed me to start my successor project "MathEclipse" with his
coding under the Eclipse Common Public License (removing dependencies to
external GPL libraries from the original project).
I know the author personally here in Germany and got his permission to use his
original parser code also under ASL.
I've also taken some methods of the Eclipse JDT parser/scanner and reworked it
for the math parser. But AFAIK the Eclipse license should be compatible with
the ASL?
How does the "IP clearance process" work technically/formally?
> Niall Pemberton - 17/Feb/08 09:56 AM
> Just to clarify - this is currently part of the matheclipse sourceforge
> project?
> http://www.matheclipse.org/
Yes, it's released in the MathEclipse project, but it's not used as a
commons-math (double or Complex type) evaluator in this project.
I've used the parser there for a symbolic math evaluator.
You can test the current syntax online in this AJAX form:
http://matheclipse.org/en/Special:Calc
See the "Examples" combo-box or the menu "Help->Input Syntax" for some syntax
examples.
The JUnit tests also show some more input examples:
http://matheclipse.cvs.sourceforge.net/matheclipse/org.matheclipse.core.test/src/org/matheclipse/core/system/SystemTestCase.java?view=markup
> Also was the parser generated using JavaCC or ANTLR or some other such tool -
> if so which?
No, it's handwritten.
> Operator precedence driven parser
> ----------------------------------
>
> Key: MATH-192
> URL: https://issues.apache.org/jira/browse/MATH-192
> Project: Commons Math
> Issue Type: New Feature
> Environment: Tested with commons-math-1.2-RC1-src
> Reporter: Axel Kramer
> Priority: Minor
> Attachments: parser.zip
>
>
> Attached are sources for an operator precedence driven parser as described
> here:
> http://en.wikipedia.org/wiki/Operator-precedence_parser
> At the moment the used syntax for the math expressions is very similar to the
> Mathematica input syntax
> and must probably be reworked for the common maths needs.
> Mainly the parser is driven by the arrays HEADER_STRINGS, OPERATOR_STRINGS
> and OPERATORS in the:
> org.matheclipse.parser.operator.ASTNodeFactory
> class.
> There's a utility class
> org.matheclipse.parser.util.GenerateOperatorArrays
> which generates the above arrays for operator sets defined in a textfile like
> for example
> /org.matheclipse.parser/eval/src/operators.txt
> JUnit test classes for testing the pure parser without any evaluations:
> /org.matheclipse.parser.test/src/org/matheclipse/parser/test/AllParserTests.java
> JUnit test classes for testing the evaluation in double or Complex
> calculation mode:
> /org.matheclipse.parser.test/src/org/matheclipse/parser/test/eval/AllEvalTests.java
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