Print (UnicodeNamedArraylist subroutine): Difference between revisions

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<span style="font-size:120%; color:black"><b><section begin=dpl_desc/>Print a UnicodeNamedArraylist<section end=dpl_desc/></b></span>
#REDIRECT [[Print (GenericNamedArraylist subroutine)]]
[[Category:UnicodeNamedArraylist methods|Print subroutine]]
<!--DPL?? Category:UnicodeNamedArraylist methods|Print subroutine: Print a UnicodeNamedArraylist-->
<p>
Print is a member of the [[UnicodeNamedArraylist class]].
</p>
 
This subroutine displays the contents of a UnicodeNamedArraylist on the user's
standard output device, typically a terminal.
The list item values, displayed in order by their subscript names,
are preceded by their item number and item name, both of which by default
are followed by a colon (<tt>:</tt>) and a blank.
==Syntax==
  %unamrayl:Print( [method]                  -
                  [,&nbsp;NumWidth=itemnumlen]      -
                  [,&nbsp;Separator=separator]      -
                  [,&nbsp;NameWidth=itemnamelen]    -
                  [,&nbsp;Start=firstitem]          -
                  [,&nbsp;MaxItems=maxitems]        -
                  [,&nbsp;Label=label] )
===Syntax Terms===
<dl>
<dt><i>%rc</i>
<dd>A numeric variable that is set to the number of UnicodeNamedArraylist items displayed.
<dt><i>%unamrayl</i>
<dd>A UnicodeNamedArraylist object.
<dt><i>method</i>
<dd>The method that is applied to ''%unamrayl'' items to produce the
printed output.
The method must take no parameters and produce an intrinsic (Float,
String, Fixed, Unicode) value.
It may be a system or user-written
method, a class Variable or Property, a local method ([[??]] refid=localm.),
or a [[Method variables|Method variable]].
 
The default value of ''method'' is <tt>ToString</tt>.
<dt><b>NumWidth=</b><i> itemnumlen</i>
<dd>The number of bytes in the display of each item to use for the
item number.
This is an optional parameter; if you specify a value, the parameter
name <tt>NumWidth</tt> is required.
 
Item numbers are right-justified within the indicated number of bytes, and they
are truncated on the left if the length of the item number exceeds the
space allocated for it.
The width must be a number between -1 and 10 inclusive.
If you specify a value of 0, the item number is not displayed.
 
If NumWidth is -1, the default, the method uses the minimum number
of bytes required to show the item number.
For example, one byte is required for item number 5, while five bytes
are required for item number 98764.
<dt><b>Separator=</b><i> separator</i>
<dd>A String, 15 characters or less, to be used to separate both the item
number and the item name from what follows.
That is, the ''separator'' you specify appears twice: once after the
item number and once after the item name.
 
This is an optional argument whose default is a colon (<tt>:</tt>).
A blank always follows the ''separator'' string.
If you specify a value, the parameter name <tt>Separator</tt> is required.
<dt><b>Start=</b><i> firstitem</i>
<dd>The item number of the initial item in the output display.
This is an optional argument, and it defaults to 1.
If you specify a value, the parameter name <tt>Start</tt> is required.
<dt><b>MaxItems=</b><i> maxitems</i>
<dd>The maximum number of items to display.
A zero or negative value means to display all the items.
 
This is an optional argument, and it defaults to zero.
If you specify a value, the parameter name <tt>MaxItems</tt> is required.
<dt><b>Label=</b><i> label</i>
<dd>A literal string that gets output before each line.
This is useful for &ldquo;tagging&rdquo; lines to make them more identifiable.
 
This is an optional argument whose default is a null string.
If you specify a value, the parameter name <tt>Label</tt> is required.
<dt><b>NameWidth=</b><i> itemnamelen</i>
<dd>The number of bytes in the display of the item name.
This must be a number from -1 through 255.
If you specify a value, the parameter name <tt>NameWidth</tt> is required.
 
Item names are left-justified within the indicated number of bytes, and they
are truncated on the right if the length of the item name exceeds the
space allocated for it.
This can result
in names being truncated in the middle of a character encoding of a Unicode
character that is not translatable to EBCDIC (as shown in
"[[Collections#Examples of subscript display format for named collections|Examples of subscript display format for named collections]]").
 
If you specify a value of 0, the item name is not displayed.
 
This is an optional argument; it defaults to -1, which directs the method to use
whatever number of bytes are necessary to show the entire item name.
For example, three bytes are required for item name <tt>Foo</tt>, while
eight bytes are required for item name <tt>Malmberg</tt>.
 
</dl>
==Usage Notes==
<ul>
<li>All errors in Print result in request cancellation.
<li>Since the maximum number of bytes of a subscript name that can be
displayed is 255, and the names in UnicodeNamedArraylists can be 127 characters
long and might be character encoded on display, Print may not
be able to display the full name of certain item subscripts.
 
If all the characters in a Unicode name need to be encoded, the 255-byte limit
can still accommodate 31 characters.
<li>[[Audit (UnicodeNamedArraylist subroutine)|Audit]] and [[Trace (UnicodeNamedArraylist subroutine)|Trace]] are
the same as Print except they send their output to the audit trail
and selected trace destination, respectively.
<li>For examples of Print method calls, see [[Collections#Printing a collection|Printing a collection]].
</ul>

Latest revision as of 12:28, 7 August 2012