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1973•International Joint Conference on Artificial IntelligenceRequires access

CLISP: conversational LISP

Warren Teitelman

Open publisher page 6 citations

Abstract

CLISP is an attempt to make LISP programs easier to read and write by extending the syntax of LISP to include infix operators, IF-THEN statements, FOR-DO-WHILE statements, and similar ALGOL-like constructs, without changing the structure or representation of the language. CLISP is implemented through LISP's error handling machinery, rather than by modifying the interpreter: when an expression is encountered whose evaluation causes an error, the expression is scanned for possible CLISP constructs, which are then converted to the equivalent LISP expressions. Thus, users can freely intermix LISP and CLISP without having to distinguish which is which. Emphasis in the design and development of CLISP has been on the system aspects of such a facility, with the goal in mind of producing a useful tool, not just another language. To this end, CLISP includes interactive error correction and many 'Do-what-I-Mean* features.

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What this paper is about

CLISP is an attempt to make LISP programs easier to read and write by extending the syntax of LISP to include infix operators, IF-THEN statements, FOR-DO-WHILE statements, and similar ALGOL-like constructs, without changing the structure or representation of the language. CLISP is implemented through LISP's error handling machinery, rather than by modifying the interpreter: when an expression is encountered whose evaluation causes an error, the expression is scanned for possible CLISP constructs, which are then converted to the equivalent LISP expressions. Thus, users can freely intermix LISP and CLISP without having to distinguish which is which. Emphasis in the design and development of CLISP has been on the system aspects of such a facility, with the goal in mind of producing a useful tool, not just another language. To this end, CLISP includes interactive error correction and many 'Do-what-I-Mean* features.

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Available abstract

CLISP is an attempt to make LISP programs easier to read and write by extending the syntax of LISP to include infix operators, IF-THEN statements, FOR-DO-WHILE statements, and similar ALGOL-like constructs, without changing the structure or representation of the language. CLISP is implemented through LISP's error handling machinery, rather than by modifying the interpreter: when an expression is encountered whose evaluation causes an error, the expression is scanned for possible CLISP constructs, which are then converted to the equivalent LISP expressions. Thus, users can freely intermix LISP and CLISP without having to distinguish which is which. Emphasis in the design and development of CLISP has been on the system aspects of such a facility, with the goal in mind of producing a useful tool, not just another language. To this end, CLISP includes interactive error correction and many 'Do-what-I-Mean* features.

Key concepts: Lisp, Interpreter, Computer science, Programming language, Exception handling, Expression (computer science), Syntax, Representation (politics)

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