{"id":159926,"date":"2010-07-01T00:00:00","date_gmt":"2010-07-01T00:00:00","guid":{"rendered":"https:\/\/www.microsoft.com\/en-us\/research\/msr-research-item\/modeling-imperative-string-operations-with-transducers\/"},"modified":"2018-10-16T20:05:40","modified_gmt":"2018-10-17T03:05:40","slug":"modeling-imperative-string-operations-with-transducers","status":"publish","type":"msr-research-item","link":"https:\/\/www.microsoft.com\/en-us\/research\/publication\/modeling-imperative-string-operations-with-transducers\/","title":{"rendered":"Modeling Imperative String Operations with Transducers"},"content":{"rendered":"<div class=\"asset-content\">\n<p>We present a domain-specific imperative language, Bek, that directly models low-level string manipulation code featuring boolean state, search operations, and substring substitutions. We show constructively that Bek is reversible through a semantics-preserving translation to symbolic finite state transducers, a novel representation for transducers that annotates transitions with logical formulae. Symbolic finite state transducers give us a new way to marry the classic theory of finite state transducers with the recent progress in satisfiability modulo theories (SMT) solvers. We exhibit an efficient well-founded encoding from symbolic finite state transducers into the higher-order theory of algebraic datatypes. We evaluate the practical utility of Bek as a constraint language in the domain of web application sanitization code. We demonstrate that our approach can address real-world queries regarding, for example, the idempotence and relative strictness of popular sanitization functions.<\/p>\n<\/div>\n<p><!-- .asset-content --><\/p>\n","protected":false},"excerpt":{"rendered":"<p>We present a domain-specific imperative language, Bek, that directly models low-level string manipulation code featuring boolean state, search operations, and substring substitutions. We show constructively that Bek is reversible through a semantics-preserving translation to symbolic finite state transducers, a novel representation for transducers that annotates transitions with logical formulae. Symbolic finite state transducers give us [&hellip;]<\/p>\n","protected":false},"featured_media":0,"template":"","meta":{"msr-url-field":"","msr-podcast-episode":"","msrModifiedDate":"","msrModifiedDateEnabled":false,"ep_exclude_from_search":false,"_classifai_error":"","msr-author-ordering":null,"msr_publishername":"Microsoft Research","msr_publisher_other":"","msr_booktitle":"","msr_chapter":"","msr_edition":"","msr_editors":"","msr_how_published":"","msr_isbn":"","msr_issue":"","msr_journal":"","msr_number":"MSR-TR-2010-96","msr_organization":"","msr_pages_string":"","msr_page_range_start":"","msr_page_range_end":"","msr_series":"","msr_volume":"","msr_copyright":"","msr_conference_name":"","msr_doi":"","msr_arxiv_id":"","msr_s2_paper_id":"","msr_mag_id":"","msr_pubmed_id":"","msr_other_authors":"Prateek 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