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π: a pattern languageπ - not to be confused with the π-calculus - is a pattern-based language being developed by the Software Technology group at Technische Universität Darmstadt. Quoting from the project website:
The basic idea here seems similar to the OMeta language, previously mentioned on LtU here, but based on EBNF instead of Parsing Expression Grammars (PEGs). Pattern definitions in π have the form declare_pattern name ≔ syntax ⇒ type ➞ meaning; Here's a trivial example of defining a pattern: declare_pattern integer_potentiation ≔ integer:i %W- "^" %W- integer:j ⇒ integer ➞ { int result = i; for (int k = 1; k <= j-1; k++) result *= i; return result; }; The resulting pattern can then be used directly in expressions, such as More information about the language, as well as the implementation, can be found at http://www.pi-programming.org. There's an OOPSLA09 paper on π as well, but I haven't been able to find an open access version of it yet. [Update: the π team has made their OOPSLA article available here] |
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