UnicodeBefore (Unicode function): Difference between revisions

From m204wiki
Jump to navigation Jump to search
m (→‎Examples: add new example using new [ & ] entities)
m (remove second example)
 
(2 intermediate revisions by the same user not shown)
Line 33: Line 33:


==Examples==
==Examples==
In the following requests, the substring that precedes the left square bracket (<tt>[</tt>) character is excerpted by <var>UnicodeBefore</var>. Two variations of the request are shown because of an enhancement for square-bracket handling introduced in version 7.6 of Model 204.
In the following request, the given initial string is "Manos: The Hands of Fate [is a D-minus] of a B movie". The substring that precedes the right square bracket (<tt>]</tt>) character representation is excerpted by <var>UnicodeBefore</var>. The request uses an [[Release notes for Model 204 version 7.6#New XHTML entities for square-bracket characters|enhancement for square-bracket handling]] introduced in version 7.6 of Model&nbsp;204.  
<ul>
<li>For version 7.6 and higher:
<p>
The left and right square brackets used in this example are created using the <code>&lsqb;</code> and <code>&rsqb;</code> XHTML entities, added by zap maintenance in version 7.6. These entities are recommended because, depending on your browser's [[Unicode#Code points.2C character set mappings|codepage]], the [[Unicode#sqbrackets|square bracket characters may or may not render correctly]]:  </p>
<p class="code">begin     
%x is unicode
%x = 'Released in 1966, Manos: The Hands of Fate &lsqb;is a D-minus&rsqb; ' with -
    'of a B movie: Its plot, about desert-dwelling pagans, makes little sense.'
printText {%x:unicodeBefore('&lsqb;')}
end
</p>
<p>
The request result is:</p>
<p class="output">Released in 1966, Manos: The Hands of Fate </p></li>
 
<li>For version 7.5:
<p>
The left and right square brackets below are created using the <var>[[U (String function)|U]]</var> method and placed in variables <code>%sqL</code> and <code>%sqR</code>. The variables are inserted into a <var>Unicode</var> string and used to parse that string: </p>
<p class="code">begin       
<p class="code">begin       
%sqL          is string len 1 initial("&#x5B;":u) static
%sqR          is string len 1 initial("&#x5D;":u) static
%x is unicode
%x is unicode
%x = 'Released in 1966, Manos: The Hands of Fate ' with %sqL with -
%x = 'Manos: The Hands of Fate <b>&lsqb;</b>is a D-minus<b>&rsqb;</b> '<b>:U</b> 'of a B movie'
    ' is a D-minus ' with %sqR with -
printText {%x:unicodeBefore('&rsqb;'<b>:U</b>)}
    ' of a B movie: Its plot, about desert-dwelling pagans, makes little sense.'
printText {%x:unicodeBefore(%sqL)}
end
end
</p>
</p>
<p>
<p>
Again, the request result is:</p>
The result is:</p>
<p class="output">Released in 1966, Manos: The Hands of Fate </p>
<p class="output">Manos: The Hands of Fate [is a D-minus</p>
</li></ul>


==See also==
==See also==
{{Template:Unicode:UnicodeBefore footer}}
{{Template:Unicode:UnicodeBefore footer}}

Latest revision as of 17:34, 3 June 2016

Part of string before a substring (Unicode class)

[Introduced in Model 204 7.5]


UnicodeBefore operates on a Unicode variable or string and returns the portion of that string before a user-specified delimiter. To get the portion of the string after a delimiter, use the UnicodeAfter string method.

Syntax

%outUnicode = unicode:UnicodeAfter( substring, [Start= number])

Syntax terms

%outUnicode A Unicode variable to hold the output of the parsed input string, unicode.
unicode A Unicode string that holds the string to be parsed.
substring A Unicode string that holds the separator character or characters on which parsing occurs.
Start This numeric value is the starting point for parsing. The default value is 1, indicating the beginning of the string.

This is a name required argument, and it cannot be 0. If a value larger than the string length is specified, the method returns a null string.

Usage notes

  • If a starting value is entered, the %outUnicode value is the content of the string that begins before the first occurrence of the delimiter substring encountered after the specified start point, or that ends at the end of the string if the delimiter token is not encountered.

    The delimiter string is not a list of individual delimiters; it is a single delimiter which may be multiple characters. If your delimiter is "ok", the method looks for occurrences of those two lowercase letters, and it returns a value that starts before the first occurrence found after the starting point.

  • This method is always case-sensitive.

Examples

In the following request, the given initial string is "Manos: The Hands of Fate [is a D-minus] of a B movie". The substring that precedes the right square bracket (]) character representation is excerpted by UnicodeBefore. The request uses an enhancement for square-bracket handling introduced in version 7.6 of Model 204.

begin %x is unicode %x = 'Manos: The Hands of Fate [is a D-minus] ':U 'of a B movie' printText {%x:unicodeBefore(']':U)} end

The result is:

Manos: The Hands of Fate [is a D-minus

See also