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From "Phil Steitz (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MATH-192) Operator precedence driven parser
Date Sun, 17 Feb 2008 17:32:39 GMT

    [ https://issues.apache.org/jira/browse/MATH-192?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12569726#action_12569726
] 

Phil Steitz commented on MATH-192:
----------------------------------

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.


> 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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