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DEC Text Processing Utility Data Types
A data type is a group of elements that ‘‘belong together’’; the elements are all
formed in the same way and are treated consistently. The data type of a variable
determines the operations that can be performed on it. The DECTPU data types
are represented by the following keywords:
• ARRAY
• BUFFER
• INTEGER
• KEYWORD
• LEARN
• MARKER
• PATTERN
• PROCESS
• PROGRAM
• RANGE
• STRING
• UNSPECIFIED
• WIDGET
• WINDOW
You use data types to interpret the contents of a variable. Unlike many
programming languages, DECTPU permits any variable to have any type of data
as a value. DECTPU has no declaration statement to restrict the type of data
that you can assign to a variable. DECTPU variables take on a data type when
they are placed on the left-hand side of an assignment statement. The right-hand
side of the assignment statement determines the data type of the variable.
Although you can construct variables freely, DECTPU built-in procedures require
that their parameters be of specific data types. Each built-in procedure can
operate only on certain data types. Some built-in procedures return a value of a
certain data type when they are executed. The following sections describe the
DECTPU data types.
DEC Text Processing Utility Data Types 3–1
- Guide to the DEC Text 1
- ProcessingUtility 1
- Contents 3
- A Sample DECTPU Procedures 7
- B DECTPU Terminal Support 7
- C DECTPU Debugger Commands 7
- Examples 7
- Intended Audience 9
- Document Structure 9
- Related Documents 9
- Reader’s Comments 9
- Conventions 10
- Monospace text 11
- 1.1 Description of DECTPU 13
- 1.1.3 DECTPU Environments 14
- 1.3 Description of EVE 16
- 1.4 DECTPU Language 17
- 1.4.5 User-Written Procedures 19
- 1.6 Learning Path for DECTPU 20
- Getting Started with DECTPU 21
- 2.1.2 Startup Files 22
- 2.4 Using Journal Files 26
- 2.4.1 Keystroke Journaling 27
- 2.6.1 /CHARACTER_SET 29
- 2.6.2 /COMMAND 30
- 2.6.3 /CREATE 31
- 2.6.4 /DEBUG 32
- 2.6.5 /DISPLAY 32
- 2.6.6 /INITIALIZATION 33
- 2.6.7 /INTERFACE 34
- 2.6.8 /JOURNAL 34
- 2.6.9 /MODIFY 35
- 2.6.10 /OUTPUT 36
- 2.6.11 /READ_ONLY 37
- 2.6.12 /RECOVER 38
- 2.6.13 /SECTION 39
- 2.6.14 /START_POSITION 40
- 3.1 Array Data Type 42
- 3.2 Buffer Data Type 43
- 3.3 Integer Data Type 44
- 3.4 Keyword Data Type 45
- 3.5 Learn Data Type 47
- 3.6 Marker Data Type 48
- 3.7 Pattern Data Type 50
- 3.7.3 Using Pattern Operators 53
- 3.7.5 Searching for a Pattern 56
- 3.7.6 Anchoring a Pattern 57
- 3.8 Process Data Type 58
- 3.9 Program Data Type 58
- 3.10 Range Data Type 59
- 3.11 String Data Type 60
- 3.12 Unspecified Data Type 61
- 3.13 Widget Data Type 62
- 3.14 Window Data Type 62
- 3.14.2 Creating Windows 63
- 3.14.4 Mapping Windows 64
- 3.14.5 Removing Windows 65
- Utility Language 67
- 4.3 Character Sets 68
- 4.3.3 General Character Sets 69
- 4.3.5 DECTPU Symbols 70
- 4.4 Identifiers 71
- 4.5 Variables 71
- 4.6 Constants 72
- 4.7 Operators 73
- 4.8 Expressions 74
- 4.8.1 Arithmetic Expressions 76
- 4.8.2 Relational Expressions 76
- 4.8.3 Pattern Expressions 77
- 4.8.4 Boolean Expressions 77
- 4.9 Reserved Words 78
- 4.10 Lexical Keywords 100
- Development 101
- 5.1 Creating DECTPU Programs 102
- 5.1.1 Simple Programs 102
- 5.1.2 Complex Programs 102
- 5.1.3 Program Syntax 103
- 5.2.1 Widget Support 104
- 5.2.2 Input Focus Support 105
- "AUXILIARY" 106
- 5.2.4 Using Callbacks 107
- 5.2.5 Using Closures 110
- 5.4 Compiling DECTPU Programs 114
- 5.5 Executing DECTPU Programs 115
- 5.5.1 Procedure Execution 116
- 5.5.2 Process Suspension 116
- 5.6.1 Section Files 117
- 5.6.2 Command Files 117
- 5.6.3 Initialization Files 118
- 5.6.5 Using Section Files 119
- 5.6.6 Using Command Files 124
- 5.7 Debugging DECTPU Programs 128
- 5.8 Handling Errors 130
- Sample DECTPU Procedures 131
- A.1 Line-Mode Editor 132
- DECTPU Terminal Support 139
- B.3 Using Terminal Wrap 141
- DECTPU Debugger Commands 143
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