Difference between revisions of "API:EPrints/Utils"

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<!-- Pod2Wiki=head_methods -->
 
==METHODS==
 
==METHODS==
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<span style='display:none'>User Comments</span>
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<!-- Edit below this comment -->
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</div>
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<!-- Pod2Wiki=item_make_name_string -->
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===make_name_string===
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$string = EPrints::Utils::make_name_string( $name, [$familylast] )
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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:
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 +
"family lineage, honourific given"
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 +
but if $familylast is true then it will be:
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"honourific given family lineage"
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<div style='background-color: #e8e8f; margin: 0.5em 0em 1em 0em; border: solid 1px #cce;  padding: 0em 1em 0em 1em; font-size: 80%; '>
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<span style='display:none'>User Comments</span>
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<!-- Edit below this comment -->
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<!-- Pod2Wiki= -->
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</div>
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<!-- Pod2Wiki=item_wrap_text -->
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===wrap_text===
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$str = EPrints::Utils::wrap_text( $text, [$width], [$init_tab], [$sub_tab] )
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Wrap $text to be at most $width (or 80 if undefined) characters per line. As a special case $width may be <tt>console</tt>, in which case the width used is the current console width ({{API:PodLink|file=Term/ReadKey|package_name=Term::ReadKey|section=|text=Term::ReadKey}}).
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 +
$init_tab and $sub_tab allow indenting on the first and subsequent lines respectively (see {{API:PodLink|file=Text/Wrap|package_name=Text::Wrap|section=|text=Text::Wrap}} for more information).
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<div style='background-color: #e8e8f; margin: 0.5em 0em 1em 0em; border: solid 1px #cce;  padding: 0em 1em 0em 1em; font-size: 80%; '>
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<span style='display:none'>User Comments</span>
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<!-- Edit below this comment -->
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<!-- Pod2Wiki= -->
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</div>
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<!-- Pod2Wiki=item_is_set -->
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===is_set===
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$boolean = EPrints::Utils::is_set( $r )
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Recursive function.
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 +
Return false if $r is not set.
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 +
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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<div style='background-color: #e8e8f; margin: 0.5em 0em 1em 0em; border: solid 1px #cce;  padding: 0em 1em 0em 1em; font-size: 80%; '>
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<span style='display:none'>User Comments</span>
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<!-- Edit below this comment -->
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<!-- Pod2Wiki= -->
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</div>
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<!-- Pod2Wiki=item_tree_to_utf8 -->
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===tree_to_utf8===
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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 $width is set then word-wrap at that many characters.
 +
 +
XHTML elements are removed with the following exceptions:
 +
 +
&lt;br /&gt; is converted to a newline.
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&lt;p&gt;...&lt;/p&gt; will have a blank line above and below.
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&lt;img /&gt; will be replaced with the content of the alt attribute.
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&lt;hr /&gt; will, if a width was specified, insert a line of dashes.
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&lt;a href="foo"&gt;bar&lt;/a&gt; will be converted into "bar &lt;foo&gt;" unless ignore_a is set.
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<div style='background-color: #e8e8f; margin: 0.5em 0em 1em 0em; border: solid 1px #cce;  padding: 0em 1em 0em 1em; font-size: 80%; '>
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<span style='display:none'>User Comments</span>
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<!-- Edit below this comment -->
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<!-- Pod2Wiki= -->
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</div>
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<!-- Pod2Wiki=item_copy -->
 +
===copy===
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$ok = EPrints::Utils::copy( $source, $target )
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Copy $source file to $target file without alteration.
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 +
Return true on success (sets $! on error).
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<div style='background-color: #e8e8f; margin: 0.5em 0em 1em 0em; border: solid 1px #cce;  padding: 0em 1em 0em 1em; font-size: 80%; '>
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<span style='display:none'>User Comments</span>
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<!-- Edit below this comment -->
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<!-- Pod2Wiki= -->
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</div>
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<!-- Pod2Wiki=item_wget -->
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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.
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Returns the HTTP response object: use $response-&gt;is_success to check whether the copy succeeded.
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<div style='background-color: #e8e8f; margin: 0.5em 0em 1em 0em; border: solid 1px #cce;  padding: 0em 1em 0em 1em; font-size: 80%; '>
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<span style='display:none'>User Comments</span>
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<!-- Edit below this comment -->
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 +
<!-- Pod2Wiki= -->
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</div>
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<!-- Pod2Wiki=item_rmtree -->
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===rmtree===
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$ok = EPrints::Utils::rmtree( $full_path )
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Unlinks the path and everything in it.
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Return true on success.
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<div style='background-color: #e8e8f; margin: 0.5em 0em 1em 0em; border: solid 1px #cce;  padding: 0em 1em 0em 1em; font-size: 80%; '>
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<span style='display:none'>User Comments</span>
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<!-- Edit below this comment -->
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<!-- Pod2Wiki= -->
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</div>
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<!-- Pod2Wiki=item_field_from_config_string -->
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===field_from_config_string===
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$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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<div style='background-color: #e8e8f; margin: 0.5em 0em 1em 0em; border: solid 1px #cce;  padding: 0em 1em 0em 1em; font-size: 80%; '>
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<span style='display:none'>User Comments</span>
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<!-- Edit below this comment -->
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<!-- Pod2Wiki= -->
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</div>
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<!-- Pod2Wiki=item_get_input -->
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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] &gt;
 +
 +
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.
 +
 +
<div style='background-color: #e8e8f; margin: 0.5em 0em 1em 0em; border: solid 1px #cce;  padding: 0em 1em 0em 1em; font-size: 80%; '>
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<span style='display:none'>User Comments</span>
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<!-- Edit below this comment -->
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<!-- Pod2Wiki= -->
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</div>
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<!-- Pod2Wiki=item_get_input_hidden -->
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===get_input_hidden===
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EPrints::Utils::get_input_hidden( $regexp, [$prompt], [$default] )
 +
Get input from the console without echoing the entered characters  (mostly useful for getting passwords). Uses {{API:PodLink|file=Term/ReadKey|package_name=Term::ReadKey|section=|text=Term::ReadKey}}.
 +
 +
Identical to get_input except the characters don't appear.
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<div style='background-color: #e8e8f; margin: 0.5em 0em 1em 0em; border: solid 1px #cce;  padding: 0em 1em 0em 1em; font-size: 80%; '>
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<span style='display:none'>User Comments</span>
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<!-- Edit below this comment -->
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<!-- Pod2Wiki= -->
 +
</div>
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<!-- Pod2Wiki=item_get_input_confirm -->
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===get_input_confirm===
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EPrints::Utils::get_input_confirm( [$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.
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Returns true if the user answers 'yes' or false for any other value.
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<div style='background-color: #e8e8f; margin: 0.5em 0em 1em 0em; border: solid 1px #cce;  padding: 0em 1em 0em 1em; font-size: 80%; '>
 +
<span style='display:none'>User Comments</span>
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<!-- Edit below this comment -->
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 +
<!-- Pod2Wiki= -->
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</div>
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<!-- Pod2Wiki=item_clone -->
 +
===clone===
 +
 +
$clone_of_data = EPrints::Utils::clone( $data )
 +
Deep copies the data structure $data, following arrays and hashes.
 +
 +
Does not handle blessed items.
 +
 +
Useful when we want to modify a temporary copy of a data structure  that came from the configuration files.
 +
 +
<div style='background-color: #e8e8f; margin: 0.5em 0em 1em 0em; border: solid 1px #cce;  padding: 0em 1em 0em 1em; font-size: 80%; '>
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<span style='display:none'>User Comments</span>
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<!-- Edit below this comment -->
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<!-- Pod2Wiki= -->
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</div>
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<!-- Pod2Wiki=item_crypt_password -->
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===crypt_password===
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$crypted_value = EPrints::Utils::crypt_password( $value, $session )
 +
Apply the crypt encoding to the given $value.
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<div style='background-color: #e8e8f; margin: 0.5em 0em 1em 0em; border: solid 1px #cce;  padding: 0em 1em 0em 1em; font-size: 80%; '>
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<span style='display:none'>User Comments</span>
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<!-- Edit below this comment -->
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<!-- Pod2Wiki= -->
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</div>
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<!-- Pod2Wiki=item_url_escape -->
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===url_escape===
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$string = EPrints::Utils::url_escape( $url )
 +
Escape the given $url, so that it can appear safely in HTML.
 +
 +
<div style='background-color: #e8e8f; margin: 0.5em 0em 1em 0em; border: solid 1px #cce;  padding: 0em 1em 0em 1em; font-size: 80%; '>
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<span style='display:none'>User Comments</span>
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<!-- Edit below this comment -->
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<!-- Pod2Wiki= -->
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</div>
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<!-- Pod2Wiki=item_ip2long -->
 +
===ip2long===
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$long = EPrints::Utils::ip2long( $ip )
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Convert quad-dotted notation to long
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<div style='background-color: #e8e8f; margin: 0.5em 0em 1em 0em; border: solid 1px #cce;  padding: 0em 1em 0em 1em; font-size: 80%; '>
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<span style='display:none'>User Comments</span>
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<!-- Edit below this comment -->
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<!-- Pod2Wiki= -->
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</div>
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<!-- Pod2Wiki=item_long2ip -->
 +
===long2ip===
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$ip = EPrints::Utils::long2ip( $ip )
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Convert long to quad-dotted notation
 +
 +
<div style='background-color: #e8e8f; margin: 0.5em 0em 1em 0em; border: solid 1px #cce;  padding: 0em 1em 0em 1em; font-size: 80%; '>
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<span style='display:none'>User Comments</span>
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<!-- Edit below this comment -->
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<!-- Pod2Wiki= -->
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</div>
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<!-- Pod2Wiki=item_cmd_version -->
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===cmd_version===
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EPrints::Utils::cmd_version( $progname )
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Print out a "--version" style message to STDOUT.
 +
 +
$progname is the name of the current script.
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<div style='background-color: #e8e8f; margin: 0.5em 0em 1em 0em; border: solid 1px #cce;  padding: 0em 1em 0em 1em; font-size: 80%; '>
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<span style='display:none'>User Comments</span>
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<!-- Edit below this comment -->
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<!-- Pod2Wiki= -->
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</div>
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<!-- Pod2Wiki=item_escape_filename -->
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===escape_filename===
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$esc_string = EPrints::Utils::escape_filename( $string )
 +
Take a value and escape it to be a legal filename to go in the /view/ section of the site.
 +
 +
<div style='background-color: #e8e8f; margin: 0.5em 0em 1em 0em; border: solid 1px #cce;  padding: 0em 1em 0em 1em; font-size: 80%; '>
 +
<span style='display:none'>User Comments</span>
 +
<!-- Edit below this comment -->
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<!-- Pod2Wiki= -->
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</div>
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<!-- Pod2Wiki=item_unescape_filename -->
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===unescape_filename===
 +
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$string = EPrints::Utils::unescape_filename( $esc_string )
 +
Unescape a string previously escaped with escape_filename().
 +
 +
<div style='background-color: #e8e8f; margin: 0.5em 0em 1em 0em; border: solid 1px #cce;  padding: 0em 1em 0em 1em; font-size: 80%; '>
 +
<span style='display:none'>User Comments</span>
 +
<!-- Edit below this comment -->
 +
 +
 +
<!-- Pod2Wiki= -->
 +
</div>
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<!-- Pod2Wiki=item_human_filesize -->
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===human_filesize===
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$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
 +
 
<div style='background-color: #e8e8f; margin: 0.5em 0em 1em 0em; border: solid 1px #cce;  padding: 0em 1em 0em 1em; font-size: 80%; '>
 
<div style='background-color: #e8e8f; margin: 0.5em 0em 1em 0em; border: solid 1px #cce;  padding: 0em 1em 0em 1em; font-size: 80%; '>
 
<span style='display:none'>User Comments</span>
 
<span style='display:none'>User Comments</span>

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

Latest Source Code (3.4, 3.3) | Revision Log | Before editing this page please read Pod2Wiki


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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