An Implementation of J
by Roger Hui
published by Iverson Software Inc., 1992-01-27.
Preface
J is a dialect of APL freely available on a wide variety of machines. It is the latest in the line of development known as "dictionary APL". The spelling scheme uses the ASCII alphabet. The underlying concepts, such as arrays, verbs, adverbs, and rank, are extensions and generalizations of ideas in APL\360. Anomalies have been removed. The result is at once simpler and more powerful than previous dialects.
This document describes an implementation of J in C. The reader is assumed to be familiar with J and C. J is specified by the ISI Dictionary of J, and introductions to the language are available in An Introduction to J and Programming in J; C is described in The C Programming Language.
Why "J"? It is easy to type.
Acknowledgment
Ex ungue leonem.
Contents
0. Introduction
1. Interpreting a Sentence
1.1 Word Formation
1.2 Parsing
1.3 Trains
1.4 Name Resolution
2. Nouns
2.1 Arrays
2.2 Types
2.3 Memory Management
3. Verbs
3.1 Anatomy of a Verb
3.2 Rank
3.3 Atomic (Scalar) Verbs
3.4 Obverses, Identities, and Variants
3.5 Error Handling
4. Adverbs and Conjunctions
5. Representation
5.1 Atomic Representation
5.2 Display Representation
5.3 String Representation
5.3 Tree Representation
6. Display
6.1 Numeric Display
6.2 Boxed Display
6.3 Formatted Display
7. Comparatives
8. Primitives
Appendices
A. Incunabulum
B. Program Files
C. The LinkJ Interface
D. Compiling
E. Foreign Conjunction
F. System Summary
Bibliography
Glossary and Index