Difference between revisions of "Utility Module"
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This [[Module Library|XQuery Module]] contains some utility and helper functions. | This [[Module Library|XQuery Module]] contains some utility and helper functions. | ||
− | With {{Announce|Version 11}}, many functions have been removed | + | With {{Announce|Version 11}}, many functions have been removed in favor of new features of XQuery 4: |
{| | {| | ||
Line 33: | Line 33: | ||
|- valign="top" | |- valign="top" | ||
| {{Code|util:map-entries}} | | {{Code|util:map-entries}} | ||
− | | [https://qt4cg.org/specifications/xpath-functions-40/Overview.html#func-map- | + | | [https://qt4cg.org/specifications/xpath-functions-40/Overview.html#func-map-entries <code>map:entries</code>] |
|- valign="top" | |- valign="top" | ||
| {{Code|util:map-values}} | | {{Code|util:map-values}} | ||
| [https://qt4cg.org/specifications/xpath-functions-40/Overview.html#func-map-values <code>map:values</code>] | | [https://qt4cg.org/specifications/xpath-functions-40/Overview.html#func-map-values <code>map:values</code>] | ||
+ | |- valign="top" | ||
+ | | {{Code|util:or}} | ||
+ | | <code>$expr1 otherwise $expr2 | ||
|- valign="top" | |- valign="top" | ||
| {{Code|util:replicate}} | | {{Code|util:replicate}} | ||
Line 46: | Line 49: | ||
All functions and errors in this module and errors are assigned to the <code><nowiki>http://basex.org/modules/util</nowiki></code> namespace, which is statically bound to the {{Code|util}} prefix.<br/> | All functions and errors in this module and errors are assigned to the <code><nowiki>http://basex.org/modules/util</nowiki></code> namespace, which is statically bound to the {{Code|util}} prefix.<br/> | ||
− | = | + | =Conditions and Ranges= |
+ | |||
+ | ==util:if== | ||
+ | |||
+ | {| width='100%' | ||
+ | |- valign="top" | ||
+ | | width='120' | '''Signature''' | ||
+ | |<pre>util:if( | ||
+ | $condition as item()*, | ||
+ | $then as item()*, | ||
+ | $else as item()* := () | ||
+ | ) as item()*</pre> | ||
+ | |- valign="top" | ||
+ | | '''Summary''' | ||
+ | |Alternative writing for the if/then/else expression: | ||
+ | * If the ''effective boolean value'' of {{Code|$condition}} is true, the {{Code|$then}} branch will be evaluated. | ||
+ | * Otherwise, {{Code|$else}} will be evaluated. If the third argument is omitted, an empty sequence will be returned. | ||
+ | |- valign="top" | ||
+ | | '''Examples''' | ||
+ | | | ||
+ | * <code>util:if(true(), 123, 456)</code> returns {{Code|123}}. | ||
+ | * <code>util:if(0, 'wrong!')</code> returns an empty sequence. | ||
+ | |} | ||
==util:count-within== | ==util:count-within== | ||
Line 61: | Line 86: | ||
| '''Summary''' | | '''Summary''' | ||
|Checks if the specified {{Code|$sequence}} has at least {{Code|$min}} and, optionally, at most {{Code|$max}} items. Equivalent to: | |Checks if the specified {{Code|$sequence}} has at least {{Code|$min}} and, optionally, at most {{Code|$max}} items. Equivalent to: | ||
− | < | + | <pre lang='xquery'> |
let $count := count($sequence) | let $count := count($sequence) | ||
return $count >= $min and $count <= $max | return $count >= $min and $count <= $max | ||
− | </ | + | </pre> |
|- valign="top" | |- valign="top" | ||
| '''Examples''' | | '''Examples''' | ||
Line 85: | Line 110: | ||
| '''Summary''' | | '''Summary''' | ||
|Returns items from {{Code|$sequence}}, starting at position {{Code|$first}} and ending at {{Code|$last}}. Equivalent to: | |Returns items from {{Code|$sequence}}, starting at position {{Code|$first}} and ending at {{Code|$last}}. Equivalent to: | ||
− | < | + | <pre lang='xquery'> |
subsequence($sequence, $first, $last - $first + 1) | subsequence($sequence, $first, $last - $first + 1) | ||
− | </ | + | </pre> |
|- valign="top" | |- valign="top" | ||
| '''Examples''' | | '''Examples''' | ||
Line 107: | Line 132: | ||
| '''Summary''' | | '''Summary''' | ||
|Returns nodes in ''distinct document order'': duplicate nodes will be removed, and the remaining nodes will be returned in [https://www.w3.org/TR/xquery-31/#dt-document-order document order]. As results of path expressions are brought distinct document order before they are returned, the function is equivalent to: | |Returns nodes in ''distinct document order'': duplicate nodes will be removed, and the remaining nodes will be returned in [https://www.w3.org/TR/xquery-31/#dt-document-order document order]. As results of path expressions are brought distinct document order before they are returned, the function is equivalent to: | ||
− | < | + | <pre lang='xquery'> |
$nodes/self::node() | $nodes/self::node() | ||
− | </ | + | </pre> |
|} | |} | ||
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| '''Summary''' | | '''Summary''' | ||
|Returns the document nodes of the specified {{Code|$nodes}}. The path expression <code>/abc</code> is internally represented as <code>util:root(.)/abc</code>. Equivalent to: | |Returns the document nodes of the specified {{Code|$nodes}}. The path expression <code>/abc</code> is internally represented as <code>util:root(.)/abc</code>. Equivalent to: | ||
− | < | + | <pre lang='xquery'> |
$nodes ! / | $nodes ! / | ||
− | </ | + | </pre> |
|} | |} | ||
Line 144: | Line 169: | ||
| | | | ||
* Remove all namespaces from an element and its descendants: | * Remove all namespaces from an element and its descendants: | ||
− | < | + | <pre lang='xquery'> |
util:strip-namespaces(<xml xmlns='uri' xmlns:prefix='uri2' prefix:name='value'><prefix:child/></xml>) | util:strip-namespaces(<xml xmlns='uri' xmlns:prefix='uri2' prefix:name='value'><prefix:child/></xml>) | ||
(: yields :) | (: yields :) | ||
<xml name='value'><child/></xml> | <xml name='value'><child/></xml> | ||
− | </ | + | </pre> |
* Remove all default namespaces: | * Remove all default namespaces: | ||
− | < | + | <pre lang='xquery'> |
<xml xmlns='uri1'><child xmlns='uri2'/></xml> | <xml xmlns='uri1'><child xmlns='uri2'/></xml> | ||
=> util:strip-namespaces('') | => util:strip-namespaces('') | ||
− | </ | + | </pre> |
|} | |} | ||
Line 177: | Line 202: | ||
;Version 9.5 | ;Version 9.5 | ||
− | * Added: {{ | + | * Added: {{Code|util:intersperse}}, {{Code|util:within}}, {{Code|util:duplicates}}, {{Code|util:array-members}}, {{Code|util:array-values}}, {{Code|util:map-entries}}, {{Code|util:map-values}} |
− | * Updated: {{ | + | * Updated: {{Code|util:replicate}}: Third argument added. |
;Version 9.4 | ;Version 9.4 | ||
Line 187: | Line 212: | ||
;Version 9.2 | ;Version 9.2 | ||
− | * Added: {{ | + | * Added: {{Code|util:chars}}, {{Code|util:init}} |
− | * Updated: {{ | + | * Updated: {{Code|util:item}}, {{Code|util:last}}, {{Function||util:range}} renamed (before: {{Code|util:item-at}}, {{Code|util:item-range}}, {{Code|util:last-from}}) |
;Version 9.1 | ;Version 9.1 | ||
− | * Added: {{Function||util:if}}, {{ | + | * Added: {{Function||util:if}}, {{Code|util:or}} |
;Version 9.0 | ;Version 9.0 | ||
− | * Added: {{ | + | * Added: {{Code|util:replicate}} |
The Module was introduced with Version 8.5. | The Module was introduced with Version 8.5. |
Latest revision as of 14:36, 5 December 2023
This XQuery Module contains some utility and helper functions.
With Version 11, many functions have been removed in favor of new features of XQuery 4:
BaseX 10 | XQuery 4 |
util:array-members
|
array:members
|
util:array-values
|
array:values
|
util:chars
|
fn:characters
|
util:duplicates
|
fn:duplicate-values
|
util:init
|
fn:trunk
|
util:intersperse
|
fn:intersperse
|
util:item
|
fn:items-at
|
util:last
|
fn:foot
|
util:map-entries
|
map:entries
|
util:map-values
|
map:values
|
util:or
|
$expr1 otherwise $expr2
|
util:replicate
|
fn:replicate
|
Contents
Conventions[edit]
All functions and errors in this module and errors are assigned to the http://basex.org/modules/util
namespace, which is statically bound to the util
prefix.
Conditions and Ranges[edit]
util:if[edit]
Signature | util:if( $condition as item()*, $then as item()*, $else as item()* := () ) as item()* |
Summary | Alternative writing for the if/then/else expression:
|
Examples |
|
util:count-within[edit]
Signature | util:count-within( $sequence as item()*, $min as xs:integer, $max as xs:integer := () ) as xs:boolean |
Summary | Checks if the specified $sequence has at least $min and, optionally, at most $max items. Equivalent to:
let $count := count($sequence)
return $count >= $min and $count <= $max
|
Examples |
|
util:range[edit]
Signature | util:range( $sequence as item()*, $first as xs:double, $last as xs:double ) as item()* |
Summary | Returns items from $sequence , starting at position $first and ending at $last . Equivalent to:
subsequence($sequence, $first, $last - $first + 1)
|
Examples |
|
Node Functions[edit]
util:ddo[edit]
Signature | util:ddo( $nodes as node()* ) as node()* |
Summary | Returns nodes in distinct document order: duplicate nodes will be removed, and the remaining nodes will be returned in document order. As results of path expressions are brought distinct document order before they are returned, the function is equivalent to:
$nodes/self::node()
|
util:root[edit]
Signature | util:root( $nodes as node()* ) as document-node()* |
Summary | Returns the document nodes of the specified $nodes . The path expression /abc is internally represented as util:root(.)/abc . Equivalent to:
$nodes ! /
|
util:strip-namespaces[edit]
Signature | util:strip-namespaces( $node as node(), $prefixes as xs:string* := () ) as node() |
Summary | Removes namespaces with the specified $prefixes from the supplied $node . An empty string can be supplied to remove the default namespace. If no prefixes are specified, all namespaces will be removed.
|
Examples |
util:strip-namespaces(<xml xmlns='uri' xmlns:prefix='uri2' prefix:name='value'><prefix:child/></xml>)
(: yields :)
<xml name='value'><child/></xml>
<xml xmlns='uri1'><child xmlns='uri2'/></xml>
=> util:strip-namespaces('')
|
Errors[edit]
Code | Description |
---|---|
negative
|
The specified number is negative. |
Changelog[edit]
- Version 11.0
- Removed:
util:array-members
,util:array-values
,util:chars
,util:duplicates
,util:init
,util:intersperse
,util:item
,util:last
,util:map-entries
,util:map-values
,util:replicate
- Version 9.7
- Added:
util:strip-namespaces
- Updated:
util:count-within
: Renamed fromutil:within
.
- Version 9.5
- Added:
util:intersperse
,util:within
,util:duplicates
,util:array-members
,util:array-values
,util:map-entries
,util:map-values
- Updated:
util:replicate
: Third argument added.
- Version 9.4
- Added:
util:root
- Version 9.3
- Added:
util:ddo
- Version 9.2
- Added:
util:chars
,util:init
- Updated:
util:item
,util:last
,util:range
renamed (before:util:item-at
,util:item-range
,util:last-from
)
- Version 9.1
- Added:
util:if
,util:or
- Version 9.0
- Added:
util:replicate
The Module was introduced with Version 8.5.