Difference between revisions of "LlParseStringKeepNulls"

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m (<lsl> tag to <source>)
 
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{{LSL_Function
{{LSL_Function
{{#vardefine:p_src_desc|source string}}
{{#vardefine:p_separators_desc|separators to be discarded}}
{{#vardefine:p_spacers_desc|spacers to be kept}}
{{#vardefine:p_ParseStringKeepNulls_desc|boolean}}
|func_id=285|func_sleep=0.0|func_energy=10.0
|func_id=285|func_sleep=0.0|func_energy=10.0
|func=llParseStringKeepNulls|return_type=list|p1_type=string|p1_name=src|p2_type=list|p2_name=separators|p3_type=list|p3_name=spacers
|func=llParseStringKeepNulls
|func_footnote='''separators''' and '''spacers''' must be lists of strings, maximum of 8 each.
|return_type=list
|p1_type=string|p1_name=src|p1_desc=source string
|p2_type=list|p2_name=separators|p2_desc=separators to be discarded
|p3_type=list|p3_name=spacers|p3_desc=spacers to be kept
|func_footnote
|func_desc
|func_desc
|return_text=that is '''src''' broken into a list, discarding '''separators''', keeping '''spacers''', keeping any null values generated.
|return_text=that is {{LSLP|src}} broken into a list, discarding {{LSLP|separators}}, keeping {{LSLP|spacers}}, keeping any null values generated.
|spec
|spec=
|caveats=*Every element in the list will be a string, no matter what you think it should be. Cast the results of [[llList2String]] to get what you want.
The behavior is identical to that for [[llParseString2List]], except blank strings found in the list are kept. This is useful when parsing a list that contains values that can be null or empty (and subsequently removing the nulls would upset the distribution of data and the element indexes).
** ''integer my_int = (integer)llList2String(my_list,i);''
 
*** [[llList2String]] is used here, as [[llList2Integer]] can only handle integers in simple notation, ie. will not handle hexadecimal integers or scientific notation.  
llParseStringKeepNulls("", ["~"], []) will return [""]
|caveats=
* Only the first 8 {{LSLP|separators}} and first 8 {{LSLP|spacers}} will be used any extras will be ignored.
* All {{LSLP|separators}} and {{LSLP|spacers}} must be strings, all other types will be ignored.
* {{LSLP|separators}} take precedent over {{LSLP|spacers}}. The string is parsed from start to finish, each position is compared against the {{LSLP|separators}} then {{LSLP|spacers}} before moving onto the next position. The first match is the one that is returned. Using the list ["A", "AB"] will always act with "A" and never "AB".
* Duplicate or irrelevant {{LSLP|separators}} or {{LSLP|spacers}} count towards the limits and slow down parsing.
* All entries in the return are typed as string. Use explicit typecasting on [[llList2String]] to convert the values into other types. Do not rely upon the implicit typecasting of the other llList2* functions (as they typically return a default value).
* Remember to capture the result of the operation with a variable, unless you are planning to act directly on the results.
|constants
|constants
|examples=<pre>default
|examples=<source lang="lsl2">default
{
{
     state_entry()
     state_entry()
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         llOwnerSay("<" + llDumpList2String(my_list,"><") + ">");
         llOwnerSay("<" + llDumpList2String(my_list,"><") + ">");
     }
     }
}</pre>
}</source>
|helpers={{LSL Functions/ParseString2List}}
|helpers=
|also_functions=*{{LSLG|llParseString2List}}
'''Replacement functions without or very large separator/spacer count limits'''
*{{LSLG|llDumpList2String}}
{{{!}}
*{{LSLG|llCSV2List}}
{{LSL DefineRow||[[ParseString2List]]|Functions exactly the same as [[llParseString2List]] and [[llParseStringKeepNulls]].}}
*{{LSLG|llList2CSV}}
{{LSL DefineRow||[[Separate Words|separateWords]]|Functions the same as [[llParseString2List]] unless certain preconditions are not met.}}
{{!}}}
|also_functions={{LSL DefineRow||[[llParseString2List]]}}
{{LSL DefineRow||[[llDumpList2String]]}}
{{LSL DefineRow||[[llCSV2List]]}}
{{LSL DefineRow||[[llList2CSV]]}}
|also_events
|also_events
|also_tests
|also_tests
|also_articles
|also_articles
|notes
|notes
|permission
|negative_index
|sort=ParseStringKeepNulls
|sort=ParseStringKeepNulls
|cat1=List
|cat1=List

Latest revision as of 14:09, 22 January 2015

Summary

Function: list llParseStringKeepNulls( string src, list separators, list spacers );
0.0 Forced Delay
10.0 Energy

Returns a list that is src broken into a list, discarding separators, keeping spacers, keeping any null values generated.

• string src – source string
• list separators – separators to be discarded
• list spacers – spacers to be kept

Specification

The behavior is identical to that for llParseString2List, except blank strings found in the list are kept. This is useful when parsing a list that contains values that can be null or empty (and subsequently removing the nulls would upset the distribution of data and the element indexes).

llParseStringKeepNulls("", ["~"], []) will return [""]

Caveats

  • Only the first 8 separators and first 8 spacers will be used any extras will be ignored.
  • All separators and spacers must be strings, all other types will be ignored.
  • separators take precedent over spacers. The string is parsed from start to finish, each position is compared against the separators then spacers before moving onto the next position. The first match is the one that is returned. Using the list ["A", "AB"] will always act with "A" and never "AB".
  • Duplicate or irrelevant separators or spacers count towards the limits and slow down parsing.
  • All entries in the return are typed as string. Use explicit typecasting on llList2String to convert the values into other types. Do not rely upon the implicit typecasting of the other llList2* functions (as they typically return a default value).
  • Remember to capture the result of the operation with a variable, unless you are planning to act directly on the results.

Examples

default
{
    state_entry()
    {
        // This will say:
        // <A><crazy><fox><.><Saw><the><moon><.><.>
        string my_string = "A crazy fox.  Saw the moon..";
        list my_list = llParseString2List(my_string,[" "],["."]);
        llOwnerSay("<" + llDumpList2String(my_list,"><") + ">");
        
        // This will say:
        //  <A><crazy><fox><.><><><Saw><the><moon><.><><.><>
        my_list = llParseStringKeepNulls(my_string,[" "],["."]);
        llOwnerSay("<" + llDumpList2String(my_list,"><") + ">");
    }
}

Useful Snippets

Replacement functions without or very large separator/spacer count limits

•  ParseString2List – Functions exactly the same as llParseString2List and llParseStringKeepNulls.
•  separateWords – Functions the same as llParseString2List unless certain preconditions are not met.

See Also

Functions

•  llParseString2List
•  llDumpList2String
•  llCSV2List
•  llList2CSV

Deep Notes

Signature

function list llParseStringKeepNulls( string src, list separators, list spacers );
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