Difference between revisions of "LlStringTrim"
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Omei Qunhua (talk | contribs) m (refer to "white space" consistently. Remove confusing extras. Rigorous alignment helps with analysis of the code.) |
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! class="unsortable"{{!}} Description | ! class="unsortable"{{!}} Description | ||
{{!}}- | {{!}}- | ||
{{!}}{{LSL Const|STRING_TRIM_HEAD|integer|1|hex=0x1|c=Trims | {{!}}{{LSL Const|STRING_TRIM_HEAD|integer|1|hex=0x1|c=Trims white space off the beginning.}} | ||
{{!}}{{#var:value}} | {{!}}{{#var:value}} | ||
{{!}}{{#var:comment}} | {{!}}{{#var:comment}} | ||
{{!}}- | {{!}}- | ||
{{!}}{{LSL Const|STRING_TRIM_TAIL|integer|2|hex=0x2|c=Trims | {{!}}{{LSL Const|STRING_TRIM_TAIL|integer|2|hex=0x2|c=Trims white space off the end.}} | ||
{{!}}{{#var:value}} | {{!}}{{#var:value}} | ||
{{!}}{{#var:comment}} | {{!}}{{#var:comment}} | ||
{{!}}- | {{!}}- | ||
{{!}}{{LSL Const|STRING_TRIM|integer|3|hex=0x3|c=Trims | {{!}}{{LSL Const|STRING_TRIM|integer|3|hex=0x3|c=Trims white space off the beginning and end.}} | ||
{{!}}{{#var:value}} | {{!}}{{#var:value}} | ||
{{!}}{{#var:comment}} | {{!}}{{#var:comment}} | ||
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This example returns the number of leading and trailing | This example returns the number of leading and trailing 'white space' characters on a string that were removed (not particularly useful but shows how to use the function). | ||
<lsl> | <lsl> | ||
default | default | ||
| Line 50: | Line 50: | ||
} | } | ||
listen(integer chan, string name, key id, string msg) | listen(integer chan, string name, key id, string msg) | ||
{ | { | ||
//track the length | //track the length | ||
integer length = llStringLength(msg); | integer length = llStringLength(msg); | ||
//trim msg (not necessary to store these to variables but makes reading easier) | //trim msg (not necessary to store these to variables but makes reading easier) | ||
string trim_left = llStringTrim(msg, STRING_TRIM_HEAD); | string trim_left = llStringTrim(msg, STRING_TRIM_HEAD); | ||
string trim_right = llStringTrim(msg, STRING_TRIM_TAIL); | string trim_right = llStringTrim(msg, STRING_TRIM_TAIL); | ||
string | string trim_both = llStringTrim(msg, STRING_TRIM); | ||
//output the results | //output the results | ||
llOwnerSay("Initial length = " + (string)length + | llOwnerSay("Initial length = " + (string)length + | ||
"\nLeading Spaces = " + (string)(length - llStringLength(trim_left))+ | "\nLeading Spaces = " + (string)(length - llStringLength(trim_left))+ | ||
"\nTrailing Spaces = " + (string)(length - llStringLength(trim_right))+ | "\nTrailing Spaces = " + (string)(length - llStringLength(trim_right))+ | ||
"\nTrimmed Message = \"" + | "\nTrimmed Message = \"" + trim_both + "\""); | ||
} | } | ||
} | } | ||
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*Introduced in 1.13.4 | *Introduced in 1.13.4 | ||
|notes= | |notes= | ||
Aside from | Aside from white space at the beginning and / or end, the actual string will be unaffected. This means too, though, that extraneous spaces within the string -- for instance, a mistaken double-space type -- will not be corrected. | ||
The following will remove all double spaces and leading and trailing spaces. | The following will remove all double spaces and leading and trailing spaces. | ||
Revision as of 14:45, 15 January 2013
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Summary
Function: string llStringTrim( string src, integer type );| 330 | Function ID |
| 0.0 | Forced Delay |
| 10.0 | Energy |
Returns a string that is src with leading and/or trailing white space (spaces, tabs, and line feeds) trimmed from it.
| • string | src | |||
| • integer | type | – | STRING_TRIM* flag(s) |
| Constant | Description | |
|---|---|---|
| STRING_TRIM_HEAD | 0x1 | Trims white space off the beginning. |
| STRING_TRIM_TAIL | 0x2 | Trims white space off the end. |
| STRING_TRIM | 0x3 | Trims white space off the beginning and end. |
Caveats
Examples
Whenever you are accepting unstructured input from a user -- whether via chat or via a notecard -- it is a good idea to always full trim it:
llStringTrim("User input", STRING_TRIM);
This example returns the number of leading and trailing 'white space' characters on a string that were removed (not particularly useful but shows how to use the function).
<lsl>
default
{
state_entry()
{
llListen(4, "", llGetOwner(), "");
}
on_rez(integer a)
{
llResetScript();
}
listen(integer chan, string name, key id, string msg)
{
//track the length
integer length = llStringLength(msg);
//trim msg (not necessary to store these to variables but makes reading easier)
string trim_left = llStringTrim(msg, STRING_TRIM_HEAD);
string trim_right = llStringTrim(msg, STRING_TRIM_TAIL);
string trim_both = llStringTrim(msg, STRING_TRIM);
//output the results
llOwnerSay("Initial length = " + (string)length +
"\nLeading Spaces = " + (string)(length - llStringLength(trim_left))+
"\nTrailing Spaces = " + (string)(length - llStringLength(trim_right))+
"\nTrimmed Message = \"" + trim_both + "\"");
}
}
</lsl>Notes
Aside from white space at the beginning and / or end, the actual string will be unaffected. This means too, though, that extraneous spaces within the string -- for instance, a mistaken double-space type -- will not be corrected.
The following will remove all double spaces and leading and trailing spaces. <lsl>llDumpList2String(llParseString2List(src, [" "], []), " "); //works but can use a large quantity of memory</lsl>
Deep Notes
History
- Introduced in 1.13.4
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Signature |
|---|
function string llStringTrim( string src, integer type ); |