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| The module was introduced with Version 7.3. Some of the functions have been adopted from the obsolete Utility Module. | | The module was introduced with Version 7.3. Some of the functions have been adopted from the obsolete Utility Module. |
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Revision as of 15:58, 17 January 2016
This XQuery Module contains functions to convert data between different formats.
Conventions
All functions in this module are assigned to the http://basex.org/modules/convert
namespace, which is statically bound to the convert
prefix.
All errors are assigned to the http://basex.org/errors
namespace, which is statically bound to the bxerr
prefix.
Strings
convert:binary-to-string
Signatures
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convert:binary-to-string($bytes as xs:anyAtomicType) as xs:string
convert:binary-to-string($bytes as xs:anyAtomicType, $encoding as xs:string) as xs:string
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Summary
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Converts the specifed binary data (xs:base64Binary, xs:hexBinary) to a string. The UTF-8 default encoding can be overwritten with the optional $encoding argument.
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Errors
|
BXCO0001 : The input is an invalid XML string, or the wrong encoding has been specified. Invalid XML characters will be ignored if the CHECKSTRINGS option is turned off.
BXCO0002 : The specified encoding is invalid or not supported.
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Examples
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convert:binary-to-string(xs:hexBinary('48656c6c6f576f726c64')) returns the string HelloWorld .
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convert:string-to-base64
Signatures
|
convert:string-to-base64($input as xs:string) as xs:base64Binary
convert:string-to-base64($input as xs:string, $encoding as xs:string) as xs:base64Binary
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Summary
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Converts the specified string to a xs:base64Binary item. If the default encoding is chosen, conversion will be cheap, as both xs:string and xs:base64Binary items are internally represented as byte arrays. The UTF-8 default encoding can be overwritten with the optional $encoding argument.
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Errors
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BXCO0001 : The input cannot be represented in the specified encoding.
BXCO0002 : The specified encoding is invalid or not supported.
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Examples
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convert:string-to-base64('HelloWorld') returns the xs:base64binary item SGVsbG9Xb3JsZA== .
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convert:string-to-hex
Signatures
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convert:string-to-hex($input as xs:string) as xs:hexBinary
convert:string-to-hex($input as xs:string, $encoding as xs:string) as xs:hexBinary
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Summary
|
Converts the specified string to a xs:hexBinary item. If the default encoding is chosen, conversion will be cheap, as both xs:string and xs:hexBinary items are internally represented as byte arrays. The UTF-8 default encoding can be overwritten with the optional $encoding argument.
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Errors
|
BXCO0001 : The input cannot be represented in the specified encoding.
BXCO0002 : The specified encoding is invalid or not supported.
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Examples
|
convert:string-to-hex('HelloWorld') returns the Base64 item 48656C6C6F576F726C64 .
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Binary Data
convert:bytes-to-base64
Signatures
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convert:bytes-to-base64($input as xs:byte*) as xs:base64Binary
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Summary
|
Converts the specified byte sequence to a xs:base64Binary item. Conversion is cheap, as xs:base64Binary items are internally represented as byte arrays.
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Errors
|
BXCO0001 : The input cannot be represented in the specified encoding.
BXCO0002 : The specified encoding is invalid or not supported.
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Examples
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convert:string-to-base64('HelloWorld') returns the xs:base64binary item SGVsbG9Xb3JsZA== .
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convert:bytes-to-hex
Signatures
|
convert:bytes-to-hex($input as xs:byte*) as xs:hexBinary
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Summary
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Converts the specified byte sequence to a xs:hexBinary item. Conversion is cheap, as xs:hexBinary items are internally represented as byte arrays.
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convert:binary-to-bytes
Signatures
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convert:binary-to-bytes($bin as xs:anyAtomicType) as xs:byte*
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Summary
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Returns the specified binary data (xs:base64Binary, xs:hexBinary) as a sequence of bytes.
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Examples
|
convert:binary-to-bytes(xs:base64Binary('QmFzZVggaXMgY29vbA==')) returns the sequence (66, 97, 115, 101, 88, 32, 105, 115, 32, 99, 111, 111, 108) .
convert:binary-to-bytes(xs:hexBinary("4261736558")) returns the sequence (66 97 115 101 88) .
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Numbers
convert:integer-to-base
Signatures
|
convert:integer-to-base($num as xs:integer, $base as xs:integer) as xs:string
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Summary
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Converts $num to base $base , interpreting it as a 64-bit unsigned integer. The first $base elements of the sequence '0',..,'9','a',..,'z' are used as digits. Valid bases are 2, .., 36 .
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Errors
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BXCO0004 : The specified base is not in the range 2-36.
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Examples
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convert:integer-to-base(-1, 16) returns the hexadecimal string 'ffffffffffffffff' .
convert:integer-to-base(22, 5) returns '42' .
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convert:integer-from-base
Signatures
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convert:integer-from-base($str as xs:string, $base as xs:integer) as xs:integer
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Summary
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Decodes an xs:integer from $str , assuming that it's encoded in base $base . The first $base elements of the sequence '0',..,'9','a',..,'z' are allowed as digits, case doesn't matter. Valid bases are 2 - 36. If $str contains more than 64 bits of information, the result is truncated arbitarily.
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Errors
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BXCO0004 : The specified base is not in the range 2-36.
BXCO0005 : The specified digit is not valid for the given range.
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Examples
|
convert:integer-from-base('ffffffffffffffff', 16) returns -1 .
convert:integer-from-base('CAFEBABE', 16) returns 3405691582 .
convert:integer-from-base('42', 5) returns 22 .
convert:integer-from-base(convert:integer-to-base(123, 7), 7) returns 123 .
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Dates and Durations
convert:integer-to-dateTime
Signatures
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convert:integer-to-dateTime($ms as xs:integer) as xs:dateTime
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Summary
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Converts the specified number of milliseconds since 1 Jan 1970 to an item of type xs:dateTime.
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Examples
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convert:integer-to-dateTime(0) returns 1970-01-01T00:00:00Z .
convert:integer-to-dateTime(1234567890123) returns 2009-02-13T23:31:30.123Z .
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convert:dateTime-to-integer
Signatures
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convert:dateTime-to-integer($dateTime as xs:dateTime) as xs:integer
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Summary
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Converts the specified item of type xs:dateTime to the number of milliseconds since 1 Jan 1970.
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Examples
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convert:dateTime-to-integer(xs:dateTime('1970-01-01T00:00:00Z')) returns 0 .
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convert:integer-to-dayTime
Signatures
|
convert:integer-to-dayTime($ms as xs:integer) as xs:dayTimeDuration
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Summary
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Converts the specified number of milliseconds to an item of type xs:dayTimeDuration.
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Examples
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convert:integer-to-dayTime(1234) returns PT1.234S .
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convert:dayTime-to-integer
Signatures
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convert:dayTime-to-integer($dayTime as xs:dayTimeDuration) as xs:integer
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Summary
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Converts the specified item of type xs:dayTimeDuration to milliseconds represented by an integer.
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Examples
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convert:dayTime-to-integer(xs:dayTimeDuration('PT1S')) returns 1000 .
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Errors
Code
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Description
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BXCO0001
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The input is an invalid XML string, or the wrong encoding has been specified.
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BXCO0002
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The specified encoding is invalid or not supported.
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BXCO0003
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The specified base is not in the range 2-36.
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BXCO0004
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The specified encoding is invalid or not supported.
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BXCO0005
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The specified digit is not valid for the given range.
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Changelog
- Version 7.5
The module was introduced with Version 7.3. Some of the functions have been adopted from the obsolete Utility Module.