API:EPrints/Utils: Difference between revisions

Revision as of 13:52, 25 February 2010

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

API: Core API

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NAME

EPrints::Utils - Utility functions for EPrints.

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SYNOPSIS

 $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( 
   $handle, 
   "http://www.eprints.org/index.php", 
   "temp_dir/my_file" ) 
 if($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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DESCRIPTION

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

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METHODS

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make_name_string

$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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wrap_text

$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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is_set

$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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tree_to_utf8

$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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copy

$ok = EPrints::Utils::copy( $source, $target )

Copy $source file to $target file without alteration.

Return true on success (sets $! on error).

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wget

$response = EPrints::Utils::wget( $session, $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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rmtree

$ok = EPrints::Utils::rmtree( $full_path )

Unlinks the path and everything in it.

Return true on success.

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field_from_config_string

$metafield = EPrints::Utils::field_from_config_string( $dataset, $fieldname )

Return the EPrint::MetaField from $dataset with the given name.

If fieldname has a semicolon followed by render options then these are passed as render options to the new EPrints::MetaField object.

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get_input

$string = EPrints::Utils::get_input( $regexp, [$prompt], [$default] )

Read input from the keyboard.

Prints the promp and default value, if any. eg.

How many fish [5] >

Return the value the user enters at the keyboard.

If the value does not match the regexp then print the prompt again and try again.

If a default is set and the user just hits return then the default value is returned.

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get_input_hidden

EPrints::Utils::get_input_hidden( $regexp, [$prompt], [$default] )

Get input from the console without echoing the entered characters (mostly useful for getting passwords). Uses Term::ReadKey.

Identical to get_input except the characters don't appear.

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get_input_confirm

EPrints::Utils::get_input_confirm( [$prompt], [$quick], [$default] )

Asks the user for confirmation (yes/no). If $quick is true only checks for a single-character input ('y' or 'n').

If $default is '1' defaults to yes, if '0' defaults to no.

Returns true if the user answers 'yes' or false for any other value.

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clone

$clone_of_data = EPrints::Utils::clone( $data )

Deep copies the data structure $data, following arrays and hashes.

Does not handle blessed items.

Useful when we want to modify a temporary copy of a data structure that came from the configuration files.

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crypt_password

$crypted_value = EPrints::Utils::crypt_password( $value, $session )

Apply the crypt encoding to the given $value.

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url_escape

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

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

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ip2long

$long = EPrints::Utils::ip2long( $ip )

Convert quad-dotted notation to long

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long2ip

$ip = EPrints::Utils::long2ip( $ip )

Convert long to quad-dotted notation

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cmd_version

EPrints::Utils::cmd_version( $progname )

Print out a "--version" style message to STDOUT.

$progname is the name of the current script.

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escape_filename

$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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unescape_filename

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

Unescape a string previously escaped with escape_filename().

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human_filesize

$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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