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jsn.php
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jsn.php
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#!/usr/bin/php
<?php
#JSN:xdudla00
function help() {
echo "NAME
jsn.php - script to convert *.json to *.xml format\nSYNOPSYS
jsn.php [OPTION]...\nOPTIONS
--input=filename
\t(UTF-8) input has to be in json format if not set script take stdin\n
--output=filename
\t(UTF-8) output will be in XML if not set script will use stdout\n
-h=subst
\tin name of element are invalid characters replaced always with 'subst'
\tdefault: subst=\"-\"\n
-n
\tscript will not generate XML header\n
-r=root-element
\twhen set script will generate result into 'root-element' tag\n
--array-name=array-element
\tallow to generate every array element into 'array-element' tag,
\tdefault: array-element='array'\n
--item-name=item-element
\tallow to generate every item of array into 'item-element' tag
\tdefault: item-element='item'\n
-s
\tstring value from tag will be replaced with text elements\n
-i
\tnumeric values from tag will be replaced with text elements\n
-l
\tvalues of literals (true, false, null) will be transformed into
\t<true/>, <false/>, <null/> instead of attributes\n
-c
\ttranslation of problematic characters\n
-a, --array-size
\tattribute size will be added to an array elements\n
-t, --index-items
\tto each element of array will be added atribute index
\tstarts from '1' unless parameter --start is set.\n
--start=n
\tinitialization of counter for option -t, --index-items
\tcauses error when -t or --index-items option is not set\nAUTHOR
Written by Tibor Dudlák.\nERROR EXIT CODES
1\t: Invalid options or their combination
2\t: Failed to read input file
3\t: Failed to open output file for writing
4\t: Invalid input file format (bad json)
50\t: When options --array-name or --array-item contains invalid characters
51\t: When option -h is set to or contains invalid characters\n";
exit(0);
}
// function prints error message with errcode and exits with errcode
function err($errcode) { // prints only that error occured and error code
fwrite(STDERR, "Program error, exit code '" . $errcode . "', type '--help' for more info.\n"); // stderr
die($errcode);
}
/*
** function parse_args returns or calls help when '--help' is second argument
** false on wrong argument combination
** else return associative array of specified arguments and their value
**/
function parse_args($args, $count)
{
$shrt_opt_rex = "^-(n|i|l|c|a|t|s)$"; //matches short params without value
$long_opt_rex = "^--(index-items|array-size)$"; //matches long params without value
$shrt_opt_rex_val = "^-(r|h)=(.*)"; //matches short params and value
$long_opt_rex_val = "^--(input|output|array-name|item-name|start)=(.*)"; //matches long params and value
if ( ( $count == 2 ) && ( $args[1] === "--help" ) ) // if only param help is set
help();
for ( $i = 1; $i <= $count-1; $i++ ) {
if( ereg($long_opt_rex_val, $args[$i], $value) || ereg($shrt_opt_rex_val, $args[$i], $value) ) { // if regex matches options with value, [1]is option [2]is value
if ( ! isset($parsing[$value[1]]) && ( $value[2] != null ) ) // when script option is not already set
$parsing[$value[1]] = $value[2];
else // when option is set causes error
return false;
}
elseif ( ereg($shrt_opt_rex, $args[$i], $value) || ereg($long_opt_rex, $args[$i], $value) ) { // when regex matches options without value, [1]is option [2]is null
if ( ! isset($parsing[$value[1]]) )
$parsing[$value[1]] = true;
else // when option is set causes error
return false;
}
else // when other than specified option is set
return false;
}
return $parsing;
}
/*
** function check_args returns
** false if wrong argument value
** else associative array filled of all needed arguments and their value
**/
function check_args($args) {
if ( $args === false ) // when parsing failed
return false;
if ( ! isset( $args['input']) )
$args['input'] = 'php://stdin';
if (! isset( $args['output']) )
$args['output'] = 'php://stdout';
if ( isset( $args['t'] ) && isset( $args['index-items'] ) ) // when -t is set --index-items can not be set it is the same option
return false;
if ( isset( $args['start'] ) ) {
if ( ! isset( $args['t'] ) && ! isset( $args['index-items'] ) ) // start has to be combined with indexing enabled
return false;
elseif ( ( ereg("^[0-9]*$", $args['start']) ) === false )
return false;
else // casting to integer
$args['start'] = (int) $args['start'];
}
else
$args['start'] = 1;
if ( ! isset( $args['h'] ) )
$args['h'] = "-";
if ( ! isset( $args['array-name'] ) )
$args['array-name'] = "array";
else // when array-name is changed script will check name, not valid causes error 50
$args['array-name'] = check_name($args['array-name'],$args['h'],false);
if ( ! isset( $args['item-name'] ) )
$args['item-name'] = "item";
else // when item-name is changed script will check name, not valid causes error 50
$args['item-name'] = check_name($args['item-name'],$args['h'],false);
if ( isset($args['array-size']) && $args['a'] ) // when -a is set --array-size can not be set it is the same option
return false;
return $args;
}
// initialization of writer and calling write_ functions
function write($json_input, $args){
$writer = new XMLWriter();
$writer->openURI($args['output']);
$writer->setIndent(true);
if ( ! isset($args['n']) ) // header
$writer->startDocument('1.0','UTF-8');
if ( isset($args['r']) ) { // placing result into "root-element" not valid name causes error 50
$writer->startElement(check_name($args['r'], $args['h'], false));
write_value( $writer, $json_input, $args );
$writer->endElement();
}
else
write_value( $writer, $json_input, $args );
}
// recursively called for writing objects
function write_object($writer, $object, $args) {
foreach ($object as $key => $value) { // when string subst is invalid character causes error 51
$writer->startElement(check_name($key, $args['h'], true));
write_value($writer, $value, $args);
$writer->endElement();
}
}
// recursively called for writing arrays
function write_array($writer, $array, $args) {
$writer->startElement($args['array-name']);
if ( isset($args['array-size']) || isset($args['a']) )
$writer->writeAttribute('size', count($array));
$index = $args['start']; // index counter initialization for every array
foreach ($array as $key => $value) {
$writer->startElement($args['item-name']);
if ( isset( $args['index-items']) || isset( $args['t']) )
$writer->writeAttribute('index', $index++);
write_value($writer, $value, $args);
$writer->endElement();
}
$writer->endElement();
}
// function for writing values
function write_value($writer, $value, $args) {
if ( is_object($value) )
write_object($writer, $value, $args);
elseif ( is_array($value) )
write_array($writer, $value, $args);
elseif ( ( is_int($value) || is_float($value) ) ) {
$value = floor($value); // need to floor number values before writing
if (isset($args['i'])) // when option -i is set
$writer->text($value);
else
$writer->writeAttribute('value', $value );
}
elseif ( ( ! isset($args['s']) && is_string($value) ) )
$writer->writeAttribute('value', $value );
elseif ( ( $value === true || $value === false || $value === null ) ) { // handling litterals true false and null
if (isset($args['l'])) { // when -l option is set for replacing literal with <literal/> tag
if ( $value === true )
$writer->writeElement("true");
elseif ( $value === false )
$writer->writeElement("false");
elseif ( $value === null )
$writer->writeElement("null");
}
else {
if ( $value === true )
$writer->writeAttribute( "value", "true");
elseif ( $value === false )
$writer->writeAttribute( "value", "false");
elseif ( $value === null )
$writer->writeAttribute( "value", "null");
}
}
elseif (isset($args['c'])) // translation of problematic characters
$writer->text($value);
else
$writer->writeRaw($value);
}
// function for checking names and replacing invalid characters
function check_name($name, $replacement, $allow_replace) {
$start_char_rex = '/^[^\p{L}|\_]/';
$validity_rex = '/<|>|"|\'|\/|\\|&|&/';
if ( preg_match($start_char_rex, $name) || preg_match($validity_rex, $name) ) { // if regex matches there is invalid character
if ( $allow_replace ) {
$name = preg_replace($validity_rex , $replacement , $name);
$name = preg_replace($start_char_rex , $replacement , $name);
if ( preg_match($start_char_rex, $name) || preg_match($validity_rex, $name) )
err(51);
}
else
err(50);
}
return $name;
}
// end of function declaration start of Input / Output chceking
if ( ( $args = @ check_args( parse_args($argv, $argc) ) ) === false )
err(1); // wrong option combination
if ( ( $json_input = @ file_get_contents($args['input']) ) === false )
err(2); // problem with reading input file
if( ! is_object( $json_input = @ json_decode($json_input, false) ) && ! is_array($json_input) )
err(4); // bad json
if ( ( $xml_output = @ fopen($args['output'], 'w')) === false )
err(3); // problem with writing to file
else
@ fclose($xml_output);
// starting function writer
@ write($json_input, $args);
?>