The design and implementation of an APL dialect, ELI

  • Authors:
  • Wai-Mee Ching

  • Affiliations:
  • Goldens Bridge, NY

  • Venue:
  • APL '00 Proceedings of the international conference on APL-Berlin-2000 conference
  • Year:
  • 2000

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Abstract

ELI is an APL dialect that uses ASCII characters. It has a workspace based programming environment: all primitives of APL1[3] and control structures. It has no nested arrays or defined operators. Instead, it has user-defined data structures, and defined functions can take functions (in addition to variables) as parameters. ELI preserves the simplicity of APL1 while modestly extends it. The ELI interpreter is implemented on Windows using Visual C++, which connects to MFC to provide many GUI functions for the Window platform. The core interpreter consists of a parser, a tree-executor, and a module implementing all primitive functions. Currently the implementation also provides a function editor and the ability to save/load workspaces.