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Mesa Language Manual


by   James G. Mitchell
     William Maybury
     Richard Sweet



Version 4.0
May 1978



Mesa is the language component of a programming system intended for developing and
maintaining a wide range of systems and applications programs. It includes facilities for
user-defined data types, strong compile-time type checking of both data types and program
interfaces, procedure and coroutine control mechanisms, control structures for dealing with
concurrency and exceptional conditions, and features designed to support the development of
systems composed of separate modules and to control information sharing among them.




                                                   XEROX
                                                   PALO ALTO RESEARCH CENTER
                                                   3333 Coyote Hill Road /    Palo Alto   /   California 94304


                                                   SYSTEMS DEVELOPMENT DEPARTMENT
                                                   3408 Hillview Avenue   /   Palo Alto /     California 94304




                         This document is for internal Xerox use only.
                                   CONTENTS
CHAPTER 1.   INTRODUCTION                                                 1
  1.1. Syntax notation                                                    2
CHAPTER 2.   BASIC DATA TYPES AND EXPRESSIONS                             4
  2.1. A slice of Mesa code                                               4
       2.1.1. Basic lexical structure                                     5
  2.2. Simple declarations                                                6
  2.3. The fundamental operations, ... , =, and #                         7
  2.4. Basic types                                                        7
       2.4.1. T.he numeric types INTE.GER, LONG INTEGER and   CARDINAL    7
           2.4.1.1. Numeric literals                                      8
       2.4.2. Type REAL                                                   9
       2.4.3. Type BOOLEAN                                                9
       2.4.4. Type CHARACTER                                             10
       2.4.5. Relations among basic types                                10
  2.5. Expressions                                                       11
       2.5.1. Numeric operators                                          12
           2.5.1.1. The operator LONG                                    14
           2.5.1.2. CHARACTER operators                                  15
       2.5.2. Relational operators                                       15
       2.5.3. BOOLEAN operators                                          16
       2.5.4. Assignment expressions                                     17
  2.6. Initializing variables in declarations                            17
       2.6.1. Compile-time constants                                     18
  2.7. More general declarations                                         19
CHAPTER 3.   COMMON CONSTRUCTED DATA TYPES                               20
  3.1. The element types                                                 22
       3.1.1. Enumerated types                                           22
       3.1.2. Subrange types                                             24
            3.1.2.1. Subranges of numeric types                          26
            3.1.2.2. Range Assertions                                    26
  3.2. Arrays                                                            27
       3.2.1. Declaration of arrays                                      29
       3.2.2. Constructors for arrays                                    30
  3.3. Records                                                           31
       3.3.1. Field lists

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