By Arthur J. Benjamin
Communications of the ACM,
Vol. 15 No. 8, Pages 742-747
A design philosophy for developing a sophisticated utility program is illustrated by the actual design and implementation of a text editor. A versatile data structure is employed so that only a small number of programmed subroutines are necessary for all types of data manipulation. Such a data structure is described, and its merits are illustrated by the ease with which powerful extensions can be implemented in terms of a few basic editing functions.
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