UnicodeSubstring (Unicode function): Difference between revisions
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{{Template:Unicode:UnicodeSubstring subtitle}} | {{Template:Unicode:UnicodeSubstring subtitle}} | ||
<var>UnicodeSubstring</var> returns a specific number of characters, starting at a specific position, from the method object <var>Unicode</var> string, possibly padding it on the right. | |||
specific position | |||
possibly padding it on the right. | |||
==Syntax== | ==Syntax== | ||
{{Template:Unicode:UnicodeSubstring syntax}} | {{Template:Unicode:UnicodeSubstring syntax}} | ||
===Syntax terms=== | ===Syntax terms=== | ||
<table class="syntaxTable"> | <table class="syntaxTable"> | ||
<tr><th | <tr><th>%outUnicode</th> | ||
<td>A Unicode variable to receive the result of the UnicodeSubstring method. </td></tr> | <td>A <var>Unicode</var> variable to receive the result of the <var>UnicodeSubstring</var> method. </td></tr> | ||
<tr><th | |||
<td>A Unicode string. </td></tr> | <tr><th>unicode</th> | ||
<tr><th> | <td>A <var>Unicode</var> string. </td></tr> | ||
<td>The character position in the method object that is the starting point of the substring that is returned. The first character from the left in the method object is position < | |||
<tr><th | <tr><th>position</th> | ||
<td>The number of characters to return. If the method object has fewer characters than the requested number of characters (starting at the | <td>The character position in the method object that is the starting point of the substring that is returned. The first character from the left in the method object is position <code>1</code>.</td></tr> | ||
<tr><th>< | |||
<td>The character used to pad the result string on the right if it is shorter than the requested length. | <tr><th>length</th> | ||
<td>The number of characters to return. If the method object has fewer characters than the requested number of characters (starting at the <var class="term">position</var>), it is either padded to the requested <var class="term">length</var>, or the entire method object starting at the <var class="term">position</var> is returned with no padding, depending on the value of the <var>Pad</var> parameter. </td></tr> | |||
<tr><th><var>Pad</var></th> | |||
<td>The character used to pad the result string on the right if it is shorter than the requested length. <var>Pad</var> defaults to the null string (<tt><nowiki>''</nowiki></tt>), which means no padding is done. <var>Pad</var> is a [[Notation conventions for methods#Named parameters|name required]] parameter.</td></tr> | |||
</table> | </table> | ||
==Usage notes== | ==Usage notes== | ||
<ul> | <ul> | ||
<li>The length must be a non-negative number. | <li>The <var class="term">length</var> must be a non-negative number. A negative <var class="term">length</var> results in request cancellation. | ||
A negative | <li>The <var>Pad</var> parameter must be either null or a single character. A longer value results in a compilation error. | ||
<li>The | <li>If the starting <var class="term">position</var> is known to be 1, it might be tidier and slightly more efficient to use the <var>UnicodeLeft</var> method instead of <var>UnicodeSubstring</var>. | ||
A longer value results in a compilation error. | <li><var>UnicodeSubstring</var> is available as of <var class="product">Sirius Mods</var> Version 7.5. | ||
<li>If the starting position is known to be 1, it might be tidier and | |||
slightly more efficient to use the UnicodeLeft method instead of UnicodeSubstring. | |||
<li> | |||
</ul> | </ul> | ||
==Examples== | ==Examples== | ||
<ol> | |||
<li>The following statement places into <code>%y</code> the 5 characters of <code>%x</code> starting at the third character. If <code>%x</code> is shorter than 7 characters, then all of <code>%x</code> is copied into <code>%y</code>: | |||
<p class="code">%y = %x:unicodeSubstring(3, 5) | |||
</p> | |||
The following statement | <li>The following statement displays <code>C?!</code>: | ||
<p class="code">%u is unicode initial('ABC&#xA1;':[[U (String function)|U]]) | |||
[[Intrinsic classes#printtext|printText]] {%u:unicodeSubstring(3,3, pad='!')} | |||
</p> | |||
The question mark in the result represents a valid EBCDIC character that is not displayable. | |||
</ | </ol> | ||
==See also== | |||
<ul> | |||
<li><var>UnicodeSubstring</var> is analogous to the intrinsic <var>[[String class|String]]</var> method: <var>[[Substring (String function)|Substring]]</var>.</ul> | |||
{{Template:Unicode:UnicodeSubstring footer}} | |||
Latest revision as of 17:43, 6 November 2012
Return a substring of the method object string (Unicode class)
UnicodeSubstring returns a specific number of characters, starting at a specific position, from the method object Unicode string, possibly padding it on the right.
Syntax
%outUnicode = unicode:UnicodeSubstring( position, [length], [Pad= c])
Syntax terms
| %outUnicode | A Unicode variable to receive the result of the UnicodeSubstring method. |
|---|---|
| unicode | A Unicode string. |
| position | The character position in the method object that is the starting point of the substring that is returned. The first character from the left in the method object is position 1. |
| length | The number of characters to return. If the method object has fewer characters than the requested number of characters (starting at the position), it is either padded to the requested length, or the entire method object starting at the position is returned with no padding, depending on the value of the Pad parameter. |
| Pad | The character used to pad the result string on the right if it is shorter than the requested length. Pad defaults to the null string (''), which means no padding is done. Pad is a name required parameter. |
Usage notes
- The length must be a non-negative number. A negative length results in request cancellation.
- The Pad parameter must be either null or a single character. A longer value results in a compilation error.
- If the starting position is known to be 1, it might be tidier and slightly more efficient to use the UnicodeLeft method instead of UnicodeSubstring.
- UnicodeSubstring is available as of Sirius Mods Version 7.5.
Examples
- The following statement places into
%ythe 5 characters of%xstarting at the third character. If%xis shorter than 7 characters, then all of%xis copied into%y:%y = %x:unicodeSubstring(3, 5)
- The following statement displays
C?!:%u is unicode initial('ABC¡':U) printText {%u:unicodeSubstring(3,3, pad='!')}
The question mark in the result represents a valid EBCDIC character that is not displayable.