April 4, 2017 Conference paper Open Access

Raskin Mikhail

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    "description": "<p>One of the powerful features of the Lisp language family is possibility to extend the language using macros.&nbsp; Some of possible extensions would benefit from a code walker, i.e. a library for processing code that keeps track of the status of different part of code, for their implementation.&nbsp; But in practice code walking is generally avoided.&nbsp;<br>\n<br>\nIn this paper, we study facilities useful to code walkers provided by &lsquo;&lsquo;Common Lisp: the Language&rsquo;&rsquo; (2nd edition) and the Common Lisp standard.&nbsp; We will show that the features described in the standard are not sufficient to write a fully portable code walker.<br>\n<br>\nOne of the problems is related to a powerful but rarely discussed feature.&nbsp; The macrolet special form allows a macro function to pass information easily to other macro invocations inside the lexical scope of the expansion.<br>\n<br>\nAnother problem for code analysis is related to the usage of non-standard special forms in expansions of standard macros. We review the handling of defun by popular free software Common Lisp implementations.<br>\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br>\nWe also survey the abilities and limitations of the available code walking and recursive macro expansion libraries.&nbsp; Some examples of apparently-conforming code that exhibit avoidable limitations of the portable code walking tools are provided.<br>\n<br>\nWe present a new attempt to implement a portable best-effort code walker for Common Lisp called Agnostic Lizard.<br>\n&nbsp;</p>", 
    "language": "eng", 
    "title": "Writing a best-effort portable code walker in Common Lisp", 
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    "keywords": [
      "code walker", 
      "macro expansion", 
      "code transformation"
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    "publication_date": "2017-04-04", 
    "creators": [
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        "orcid": "0000-0002-6660-5673", 
        "affiliation": "LaBRI, University of Bordeaux", 
        "name": "Raskin Mikhail"
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    "meeting": {
      "acronym": "ELS-2017", 
      "url": "https://european-lisp-symposium.org/2017/", 
      "dates": "3-4 April 2017", 
      "place": "Brussels, Belgium", 
      "title": "European Lisp Symposum 2017"
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