PositionIn and PositionOf (String functions): Difference between revisions

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{{Template:String:PositionIn subtitle}}
{{Template:String:PositionIn and PositionOf subtitle}}


{{Template:String:PositionOf subtitle}}
The <var>PositionIn</var> and <var>PositionOf</var> functions return the numeric position of the first occurrence of one string inside another.  The difference between the two methods is that for <var>PositionIn</var>, the method object string is located in the first argument string, whereas for <var>PositionOf</var>, the first argument string is located in the method object string.  Which is more convenient to use will be application dependent.


These functions return the numeric position of the first occurrence of one string inside another.
==Syntax==
The difference between the two methods is that for PositionIn, the method
object string is located in the first argument string, whereas for
PositionOf, the first argument string is located in the method object
string.
Which is more convenient to use will be application dependent.
 
These functions are available as of version 7.2 of the [[Sirius Mods]].
==PositionIn and PositionOf syntax==
{{Template:String:PositionIn syntax}}
{{Template:String:PositionIn syntax}}
{{Template:String:PositionOf syntax}}
{{Template:String:PositionOf syntax}}
===Syntax Terms===
 
===Syntax terms===
<table class="syntaxTable">
<table class="syntaxTable">
<tr><th>%pos                                                                                                    </th>
<tr><th>%position</th>
<td>A variable to receive the position of the first occurrence of the                                       ''needle'' string in the ''haystack'' string, starting at the implicit or explicit starting position.       If ''needle'' is not found in ''haystack'', ''spos'' is set to 0.                                           </td></tr>
<td>A variable to receive the position of the first occurrence of the <var class="term">needle</var> string in the <var class="term">haystack</var> string, starting at the implicit or explicit starting position. If <var class="term">needle</var> is not found in <var class="term">haystack</var> or <var class="term">needle</var> is the null string, <var class="term">%position</var> is set to 0. </td></tr>
<tr><th>needle                                                                                                  </th>
 
<td>The string to be located in the ''haystack'' string.                                                    </td></tr>
<tr><th>string</th>
<tr><th>haystack                                                                                                 </th>
<td>The method object string.  Depending upon whether the <var>PositionIn</var> or <var>PositionOf</var> method is being used, <var class="term">string</var> may be either the:
<td>The string in which ''needle'' is to be located.                                                         </td></tr>
<ul>
<tr><th>Start=spos                                                                                              </th>
<li>search target <var class="term">needle</var>, when called as <var>PositionIn</var>
<td>This optional, name-required argument is a number that specifies the position in the ''haystack'' string at which to start searching for the ''needle'' string.                                                       ''spos'' defaults to 1, meaning that the search begins at the first character in ''haystack''.</td></tr>
<li>the search space <var class="term">haystack</var>, when called as <var>PositionOf</var></ul></td></tr>
 
<tr><th>haystack</th>
<td>The search space string in which the search target <var class="term">needle</var> is to be located.</td></tr>
 
<tr><th>needle</th>
<td>The search target string to be located in the search space <var class="term">haystack</var> string.</td></tr>
 
<tr><th><var>Start</var></th>
<td>An optional, but [[Notation conventions for methods#Named parameters|name required]], number specifying the position in the search space <var class="term">haystack</var> string at which to start searching for the search target <var class="term">needle</var> string. <var>Start</var> defaults to 1, meaning that the search begins at the first character in <var class="term">haystack</var>.</td></tr>
</table>
</table>


==Usage Notes==
==Usage notes==
*The starting position must be a positive number. A zero or negative number results in request cancellation. Specifying a starting position greater than the length of (''haystack'' plus one minus the length of ''needle'') returns a zero, because there are not enough characters in ''haystack'' to satisfy the search.
<ul>
*The PositionOf and PositionIn methods do exactly the same thing. The only difference between them is that in PositionOf, the ''haystack'' is the method object and the ''needle'' is the first argument. In PositionIn, the method object and first argument are reversed. Which method is preferable will depend on the application, and, in many cases, it will be quite arbitrary which one is used.
<li>The <var class="term">start</var> position must be a positive number. A zero or negative number results in request cancellation. Specifying a <var class="term">start</var> position greater than the length of (<var class="term">haystack</var> plus one minus the length of <var class="term">needle</var>) returns a zero, because there are not enough characters in <var class="term">haystack</var> to satisfy the search.
*The PositionOf and PositionIn methods are the object-oriented equivalents of the User Language $index function.
 
<li><var>PositionIn</var> / <var>PositionOf</var> do exactly the same thing. The only difference between them is that in <var>PositionOf</var>, the <var class="term">haystack</var> is the method object <var class="term">string</var> and the <var class="term">needle</var> is the first argument. In <var>PositionIn</var>, these roles are reversed: the <var class="term">needle</var> is the method object <var class="term">string</var> and the <var class="term">haystack</var> is the first argument. Which method is preferable will depend on the application, and, in many cases, it will be quite arbitrary which one is used.
 
<li><var>PositionIn</var> / <var>PositionOf</var> are the object-oriented equivalents of the <var class="product">User Language</var> <var>[[$Index]]</var> function.
 
<li><var>PositionIn</var> / <var>PositionOf</var> are available as of <var class="product">Sirius Mods</var> Version 7.2.</ul>
 
==Examples==
==Examples==
*If ''''%s'''' contains "This is a test", the following statements
<ol>
    [[Intrinsic classes#printtext|printText]] {%s:positionOf('is')}
<li>If <code>%s</code> contains <code>This is a test</code>, the following statements
    printText {%s:positionOf('is', start=4)}
<p class="code">[[PrintText statement|printText]] {%s:positionOf('is')}
    printText {%s:positionOf('is', start=7)}
printText {%s:positionOf('is', start=4)}
printText {%s:positionOf('is', start=7)}
</p>
will display
will display
    3
<p class="code"> 3
    6
6
    0
0
*If ''''%s'''' contains "ver", the following statements
</p>
    printText {%s:positionIn('Never say never')}
    printText {%s:positionIn('Never say never', start=4)}
    printText {%s:positionIn('Never say never', start=14)}


<li>If <code>%s</code> contains <code>ver</code>, the following statements
<p class="code">printText {%s:positionIn('Never say never')}
printText {%s:positionIn('Never say never', start=4)}
printText {%s:positionIn('Never say never', start=14)}
</p>
will display
will display
    3
<p class="code">3
    13
13
    0
0
</p>
</ol>


==See also==
==See also==
[[List of intrinsic String methods]]
{{Template:String:PositionIn and PositionOf footer}}
 
[[Category:Intrinsic String methods|PositionIn and PositionOf function]]
[[Category:Intrinsic methods]]

Latest revision as of 17:28, 27 November 2012

The position of one string inside another (String class)


The PositionIn and PositionOf functions return the numeric position of the first occurrence of one string inside another. The difference between the two methods is that for PositionIn, the method object string is located in the first argument string, whereas for PositionOf, the first argument string is located in the method object string. Which is more convenient to use will be application dependent.

Syntax

%position = string:PositionIn( haystack, [Start= number])

%position = string:PositionOf( needle, [Start= number])

Syntax terms

%position A variable to receive the position of the first occurrence of the needle string in the haystack string, starting at the implicit or explicit starting position. If needle is not found in haystack or needle is the null string, %position is set to 0.
string The method object string. Depending upon whether the PositionIn or PositionOf method is being used, string may be either the:
  • search target needle, when called as PositionIn
  • the search space haystack, when called as PositionOf
haystack The search space string in which the search target needle is to be located.
needle The search target string to be located in the search space haystack string.
Start An optional, but name required, number specifying the position in the search space haystack string at which to start searching for the search target needle string. Start defaults to 1, meaning that the search begins at the first character in haystack.

Usage notes

  • The start position must be a positive number. A zero or negative number results in request cancellation. Specifying a start position greater than the length of (haystack plus one minus the length of needle) returns a zero, because there are not enough characters in haystack to satisfy the search.
  • PositionIn / PositionOf do exactly the same thing. The only difference between them is that in PositionOf, the haystack is the method object string and the needle is the first argument. In PositionIn, these roles are reversed: the needle is the method object string and the haystack is the first argument. Which method is preferable will depend on the application, and, in many cases, it will be quite arbitrary which one is used.
  • PositionIn / PositionOf are the object-oriented equivalents of the User Language $Index function.
  • PositionIn / PositionOf are available as of Sirius Mods Version 7.2.

Examples

  1. If %s contains This is a test, the following statements

    printText {%s:positionOf('is')} printText {%s:positionOf('is', start=4)} printText {%s:positionOf('is', start=7)}

    will display

    3 6 0

  2. If %s contains ver, the following statements

    printText {%s:positionIn('Never say never')} printText {%s:positionIn('Never say never', start=4)} printText {%s:positionIn('Never say never', start=14)}

    will display

    3 13 0

See also