Difference between revisions of "API:EPrints/Utils"

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Revision as of 13:08, 20 August 2009

EPrints 3 Reference: Directory Structure - Metadata Fields - Repository Configuration - XML Config Files - XML Export Format - EPrints data structure - Core API - Data Objects


Latest Source Code (3.3, 3.2) | Revision Log | Before editing this page please read Pod2Wiki


EPrints::Utils - Utility functions for EPrints.

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 $boolean = EPrints::Utils::is_set( $object ) 
 # return true if an object/scalar/array has any data in it
 # copy the contents of the url to a file
 $response = EPrints::Utils::wget( 
   "temp_dir/my_file" ) 
 if($response->is_sucess()){ do something...}
 $name = { given=>"Wendy", family=>"Hall", honourific=>"Dame" };
 # return Dame Wendy Hall
 $string = EPrints::Utils::make_name_string( $name, 1 );
 # return Dame Hall, Wendy
 $string = EPrints::Utils::make_name_string( $name, 0 );
 # returns http://www.eprints.org?var=%3Cfoo%3E
 $string = EPrints::Utils::url_escape( "http://www.eprints.org?var=<foo>" ); 
 $esc_string = EPrints::Utils::escape_filename( $string );
 $string = EPrints::Utils::unescape_filename( $esc_string );
 $filesize_text = EPrints::Utils::human_filesize( 3300 ); 
 # returns "3kb"

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This package contains functions which don't belong anywhere else.

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$string = EPrints::Utils::make_name_string( $name, [$familylast] )

Return a string containing the name described in the hash reference $name.

The keys of the hash are one or more of given, family, honourific and lineage. The values are utf-8 strings.

Normally the result will be:

"family lineage, honourific given"

but if $familylast is true then it will be:

"honourific given family lineage"

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$str = EPrints::Utils::wrap_text( $text, [$width], [$init_tab], [$sub_tab] )

Wrap $text to be at most $width (or 80 if undefined) characters per line. As a special case $width may be console, in which case the width used is the current console width (Term::ReadKey).

$init_tab and $sub_tab allow indenting on the first and subsequent lines respectively (see Text::Wrap for more information).

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$boolean = EPrints::Utils::is_set( $r )

Recursive function.

Return false if $r is not set.

If $r is a scalar then returns true if it is not an empty string.

For arrays and hashes return true if at least one value of them is_set().

This is used to see if a complex data structure actually has any data in it.

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$string = EPrints::Utils::tree_to_utf8( $tree, $width, [$pre], [$whitespace_before], [$ignore_a] )

Convert a XML DOM tree to a utf-8 encoded string.

If $width is set then word-wrap at that many characters.

XHTML elements are removed with the following exceptions:

<br /> is converted to a newline.

<p>...</p> will have a blank line above and below.

<img /> will be replaced with the content of the alt attribute.

<hr /> will, if a width was specified, insert a line of dashes.

<a href="foo">bar</a> will be converted into "bar <foo>" unless ignore_a is set.

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$response = EPrints::Utils::wget( $handle, $source, $target )

Copy $source file or URL to $target file without alteration.

Will fail if $source is a "file:" and "enable_file_imports" is false or if $source is any other scheme and "enable_web_imports" is false.

Returns the HTTP response object: use $response->is_success to check whether the copy succeeded.

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$string = EPrints::Utils::url_escape( $url )

Escape the given $url, so that it can appear safely in HTML.

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$esc_string = EPrints::Utils::escape_filename( $string )

Take a value and escape it to be a legal filename to go in the /view/ section of the site.

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$string = EPrints::Utils::unescape_filename( $esc_string )

Unescape a string previously escaped with escape_filename().

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$filesize_text = EPrints::Utils::human_filesize( $size_in_bytes )

Return a human readable version of a filesize. If 0-4095b then show as bytes, if 4-4095Kb show as Kb otherwise show as Mb.

eg. Input of 5234 gives "5Kb", input of 3234 gives "3234b".

This is not internationalised, I don't think it needs to be. Let me know if this is a problem. support@eprints.org

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