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From "Paul Libbrecht (JIRA)" <>
Subject [jira] Commented: (MATH-192) Operator precedence driven parser
Date Sat, 16 Feb 2008 22:49:08 GMT


Paul Libbrecht commented on MATH-192:


how extensible is this parser ?
Could it be "warm extensible", that is, extensible after compilation, by programme-calls?

E.g. could I redefine after class-loading, that \ is the (binary) set difference or the (unary)
macro-call ?

thanks in advance


PS: do I understand correctly that your submission is expected as a donation that'd be under

> Operator precedence driven parser 
> ----------------------------------
>                 Key: MATH-192
>                 URL:
>             Project: Commons Math
>          Issue Type: New Feature
>         Environment: Tested with commons-math-1.2-RC1-src
>            Reporter: Axel Kramer
>            Priority: Minor
>         Attachments:
> Attached are sources for an operator precedence driven parser as described here:
> 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/
> JUnit test classes for testing the evaluation in double or Complex calculation mode:
> /org.matheclipse.parser.test/src/org/matheclipse/parser/test/eval/

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