Editing by example

  • Authors:
  • Robert P. Nix

  • Affiliations:
  • Yale Univ., New Haven, CT

  • Venue:
  • ACM Transactions on Programming Languages and Systems (TOPLAS)
  • Year:
  • 1985

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Abstract

An editing by example system is an automatic program synthesis facility embedded in a text editor that can be used to solve repetitive text editing problems. The user provides the editor with a few examples of a text transformation. The system analyzes the examples and generalizes them into a program that can perform the transformation to the rest of the user's text. This paper presents an overview of the design, analysis, and implementation of a practical editing by example system. It studies the problem of synthesizing a text processing program that generalizes the transformation implicitly described by a small number of input/output examples. A class of text processing programs called gap programs is defined and the problems associated with synthesizing them from examples are examined, leading to an efficient heuristic that provably synthesizes a gap program from examples of its input/output behavior. The editing by example system derived from this analysis has been embedded in a production text editor. By developing an editing by example system that solves a useful class of text processing problems, this work demonstrates that program synthesis is feasible in the domain of text editing.