ISO/IEC INTERNATIONAL STANDARD 13751 First edition 2001-02-01 Information technology Programming languages, their environments and system software interfaces : Programming language Extended APL Technologies de I'information Langages de programmation, leurs environnements et interfaces logiciel systemeLangage de programmation APL étendu Reference number ISO/IEC 13751:2001(E) E( @ISO/IEC 2001 Copyright International Organization for Standardization ted without license from IHS Not for Resale ISO/IEC 13751:2001(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading this area. Adobe is a trademarkof Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event ?ISO/IEC2001 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISO's member body in the country of the requester. ISO copyright office Case postale 56. CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail [email protected] Web www.iso.ch Printed in Switzerland CopyightinteratinalOorganization for Standardization @ISO/IEC2001-All rightsreserved mittedwithoutlicensefrom IHS Not for Resale ISO/IEC13751:2001(E) Contents 1 Scope 1 2 Normative References 2 3 Form of this International Standard 3 3.1 Form of Definitions 3 3.2 Named Arrays in Examples 4 3.3 Notes 5 3.4 Cross-References 5 3.5 General Definitions 5 4 Compliance 7 4.1 Conforming Implementations 7 4.1.1 Required Behaviour for Conforming Implementations 7 4.1.2 Required Documentation for Conforming Implementations 8 4.1.2.1 Documentation of Optional-Facilities 8 4.1.2.2 Documentationof Implementation-Defined-Facilities 8 4.1.2.3 Consistent Extensions 9 4.2 Conforming Programs 9 4.2.1 Required Behaviour for Conforming Programs 9 4.2.2 Required Documentation for Conforming Programs 9 5 Definitions 11 5.1 Characters 11 5.2 Numbers 13 5.2.1 Elementary Operations 13 5.2.2 Number Constants 14 5.2.3 Subsets of the Set of Numbers 14 5.2.4 Implementation Algorithms 16 5.2.5 Defined Operations 18 5.3 Objects 20 5.3.1 Lists 20 5.3.2 Arrays 21 5.3.3 Defined-Functions 23 5.3.4 Tokens 25 @ ISO/IEC 2001 - All rights reserved ili pyrighIntematnalOrganizationforStandardizatio No reproduction or networking pemited withoutlicense from IHS Not for Resale ISO/IEC 13751 :2001 (E) 5.3.4.1 Metaclasses 26 5.3.4.2 Index-List 29 5.3.5 Symbols 29 5.3.6 Contexts 29 5.3.7 Workspaces 30 5.3.8 Sessions 30 5.3.9 Shared-Variables 32 5.3.10 Systems 33 5.4 Evaluation Sequences 35 5.4.1 Evaluation Sequence Phrases 36 5.4.2 Diagrams 37 5.5 Other Terms 38 b Syntax and Evaluation 39 6.1 Introduction 39 6.1.1 Evaluate-Line 39 6.1.2 Character-Diagrams 40 6.1.3 Evaluate-Statement 47 6.1.4 Bind-Token-Class 49 6.1.5 Literal-Conversion 50 6.1.6 Statement-Analysis Token-Diagrams 50 6.2 Reduce-Statement 55 6.3 The Phrase Evaluators 60 6.3.1 Diagrams 60 6.3.2 Remove-Parentheses 60 6.3.3 Evaluate-Niladic-Function 60 6.3.4 Evaluate-Monadic-Function 61 6.3.5 Evaluate-Monadic-Operator 62 6.3.6 Evaluate-Dyadic-Function 63 6.3.7 Evaluate-Dyadic-Operator 65 6.3.8 Evaluate-Indexed-Reference 66 6.3.9 Evaluate-Assignment 67 6.3.10 Evaluate-Indexed-Assignment 67 6.3.11 Evaluate-Variable 68 6.3.12 Build-Index-List 68 6.3.13 Process-End-of-Statement 69 6.4 The Form Table 70 7 Scalar Functions 75 7.1 Monadic Scalar Functions 76 7.1.1 Conjugate 76 7.1.2 Neg