Compaq DEC Text Processing Utility AA-PWCBD-TE Manual do Utilizador Página 74
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Lexical Elements of the DEC Text Processing Utility Language
4.7 Operators
Table 4–5 (Cont.) DECTPU Operators
Type Symbol Description
+ Pattern concatenation
& Pattern linkage
Logical AND Boolean AND
NOT Boolean NOT
OR Boolean OR
XOR Boolean exclusive OR
You can use the + operator to concatenate strings. You can also use the relational
operators to compare a string with a string, a marker with a marker, or a range
with a range.
The precedence of the operators in an expression determines the order in which
the operands are evaluated. Table 4–6 lists the order of precedence for DECTPU
operators. Operators of equal precedence are listed on the same line.
Table 4–6 Operator Precedence
Operator Precedence
unary +,unary – Highest
NOT
*, /, AND
@, &, +, –, |, OR, XOR
=, <>, <, <=, >, >=
:= Lowest
Expressions enclosed in parentheses are evaluated first. You must use
parentheses for correct evaluation of an expression that combines relational
operators.
You can use parentheses in an expression to force a particular order for combining
operands. For example:
Expression Result
8*5/2-4 16
8*5/(2-4) -20
4.8 Expressions
An expression can be a constant, a variable, a procedure, or a combination of
these separated by operators. You can use expressions in a DECTPU procedure
where an identifier or constant is required. Expressions are frequently used
within DECTPU conditional language statements.
The data types of all elements of a DECTPU expression must be the same. The
following are exceptions to this rule:
• You can mix keywords, strings, and pattern variables in expressions used to
create patterns.
4–8 Lexical Elements of the DEC Text Processing Utility Language
- 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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