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Kaplan, Simon M. Najork, Marc-Alexander 2011-05-07T11:59:38Z 2011-05-07T11:59:38Z 10000-01-01 1994 This thesis describes Cube, the first visual language to employ a three-dimensional syntax. The third dimension provides for a richer syntax, makes the language more expressive, and prepares the ground for novel, virtual-reality-based programming environments. We use dimensional extent to convey semantic meaning, or more precisely, to distinguish between logical disjunctions and conjunctions, and between sum and product types. Cube uses the data flow metaphor as an intuitive way to describe logic programs. The semantics of the language is based on a higher-order form of Horn logic. Predicates are viewed as a special kind of terms, and are treated as first-class values. In particularly, they can be passed as arguments to other predicates, which allows us to define higher-order predicates. Cube has a static polymorphic type system, and uses the Hindley-Milner algorithm to perform type inference. Well-typed programs are guaranteed to be type-safe. We have implemented two Cube interpreters: An initial feasibility study, and a prototype implementation with improved interactive capabilities. Both of them exploit the implicit parallelism of the language by simulated concurrency, implemented via time-slicing. Made available in DSpace on 2011-05-07T11:59:38Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9416415.pdf: 6524869 bytes, checksum: 289fb34486c544015e52d47557e10e8f (MD5) Previous issue date: 1994 Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:35:15Z Item is restricted indefinitely. Restriction data tranferred 2014-07-01T11:13:50-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission ETDs are only available to UIUC Users without author permission U of I Only AAI9416415 (UMI)AAI9416415 http://hdl.handle.net/2142/19189 eng Copyright 1994 Najork, Marc-Alexander Computer Science Programming in three dimensions text Computer Science Computer Science University of Illinois at Urbana-Champaign Dissertation Ph.D.