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php-json-ld
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Simplified relation serialization format.

This commit is contained in:
Dave Longley 2011-08-02 01:49:14 -04:00
parent 98f8f76130
commit 5244670fdb
1 changed files with 98 additions and 118 deletions
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216
jsonld.php
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@ -118,7 +118,7 @@ function jsonld_add_context($ctx, $input)
{ {
foreach($rval as $v) foreach($rval as $v)
{ {
$v->{'@context'} = _cloneContext($ctxOut); $v->{'@context'} = _clone($ctxOut);
} }
} }
else else
@ -160,8 +160,8 @@ function jsonld_compact($ctx, $input)
function jsonld_merge_contexts($ctx1, $ctx2) function jsonld_merge_contexts($ctx1, $ctx2)
{ {
// copy contexts // copy contexts
$merged = _cloneContext($ctx1); $merged = _clone($ctx1);
$copy = _cloneContext($ctx2); $copy = _clone($ctx2);
// if the new context contains any IRIs that are in the merged context, // if the new context contains any IRIs that are in the merged context,
// remove them from the merged context, they will be overwritten // remove them from the merged context, they will be overwritten
@ -541,10 +541,8 @@ function _setProperty($s, $p, $o)
} }
/** /**
* Clones a string/number or an object and sorts the keys. Deep clone * Clones an object, array, or string/number. If cloning an object, the keys
* is not performed. This function will deep copy arrays, but that feature * will be sorted.
* isn't needed in this implementation at present. If it is needed in the
* future, it will have to be implemented here.
* *
* @param value the value to clone. * @param value the value to clone.
* *
@ -561,7 +559,15 @@ function _clone($value)
sort($keys); sort($keys);
foreach($keys as $key) foreach($keys as $key)
{ {
$rval->$key = $value->$key; $rval->$key = _clone($value->$key);
}
}
else if(is_array($value))
{
$rval = array();
foreach($value as $v)
{
$rval[] = _clone($v);
} }
} }
else else
@ -572,35 +578,6 @@ function _clone($value)
return $rval; return $rval;
} }
/**
* Clones a context.
*
* @param ctx the context to clone.
*
* @return the clone of the context.
*/
function _cloneContext($ctx)
{
$rval = new stdClass();
foreach($ctx as $key => $value)
{
// deep-copy @coerce
if($key === '@coerce')
{
$rval->{'@coerce'} = new stdClass();
foreach($ctx->{'@coerce'} as $type => $p)
{
$rval->{'@coerce'}->$type = $p;
}
}
else
{
$rval->$key = $ctx->$key;
}
}
return $rval;
}
/** /**
* Gets the coerce type for the given property. * Gets the coerce type for the given property.
* *
@ -1449,9 +1426,16 @@ class MappingBuilder
public function __construct() public function __construct()
{ {
$this->count = 1; $this->count = 1;
$this->mapped = new stdClass(); $this->processed = new stdClass();
$this->mapping = new stdClass(); $this->mapping = new stdClass();
$this->output = new stdClass(); $this->adj = new stdClass();
$this->keyStack = array();
$entry = new stdClass();
$entry->keys = array('s1');
$entry->idx = 0;
$this->keyStack[] = $entry;
$this->done = new stdClass();
$this->s = '';
} }
/** /**
@ -1463,9 +1447,12 @@ class MappingBuilder
{ {
$rval = new MappingBuilder(); $rval = new MappingBuilder();
$rval->count = $this->count; $rval->count = $this->count;
$rval->mapped = _clone($this->mapped); $rval->processed = _clone($this->processed);
$rval->mapping = _clone($this->mapping); $rval->mapping = _clone($this->mapping);
$rval->output = _clone($this->output); $rval->adj = _clone($this->adj);
$rval->keyStack = _clone($this->keyStack);
$rval->done = _clone($this->done);
$rval->s = $this->s;
return $rval; return $rval;
} }
@ -1941,48 +1928,49 @@ class JsonLdProcessor
} }
/** /**
* Recursively creates a relation serialization (partial or full). * Recursively increments the relation serialization for a mapping.
* *
* @param keys the keys to serialize in the current output. * @param mb the mapping builder to update.
* @param output the current mapping builder output.
* @param done the already serialized keys.
*
* @return the relation serialization.
*/ */
public function recursiveSerializeMapping($keys, $output, $done) public function serializeMapping($mb)
{ {
$rval = ''; if(count($mb->keyStack) > 0)
foreach($keys as $k)
{ {
if(!property_exists($output, $k)) // continue from top of key stack
$next = array_pop($mb->keyStack);
$len = count($next->keys);
for(; $next->idx < $len; ++$next->idx)
{ {
break; $k = $next->keys[$next->idx];
} if(!property_exists($mb->adj, $k))
if(property_exists($done, $k))
{
// mark cycle
$rval .= '_' . $k;
}
else
{
$done->$k = true;
$tmp = $output->$k;
foreach($tmp->k as $s)
{ {
$rval .= $s; $mb->keyStack[] = $next;
$iri = $tmp->m->$s; break;
}
if(property_exists($mb->done, $k))
{
// mark cycle
$mb->s .= '_' . $k;
}
else
{
// mark key as serialized
$mb->done->$k = true;
// serialize top-level key and its details
$s = $k;
$adj = $mb->adj->$k;
$iri = $adj->i;
if(property_exists($this->subjects, $iri)) if(property_exists($this->subjects, $iri))
{ {
$b = $this->subjects->$iri; $b = $this->subjects->$iri;
// serialize properties // serialize properties
$rval .= '<'; $s .= '<' . $this->serializeProperties($b) . '>';
$rval .= $this->serializeProperties($b);
$rval .= '>';
// serialize references // serialize references
$rval .= '<'; $s .= '<';
$first = true; $first = true;
$refs = $this->edges->refs->$iri->all; $refs = $this->edges->refs->$iri->all;
foreach($refs as $r) foreach($refs as $r)
@ -1993,52 +1981,46 @@ class JsonLdProcessor
} }
else else
{ {
$rval .= '|'; $s .= '|';
} }
$rval .= _isBlankNodeIri($r->s) ? '_:' : $refs->s; $s .= _isBlankNodeIri($r->s) ? '_:' : $refs->s;
} }
$rval .= '>'; $s .= '>';
} }
}
$rval .= $this->recursiveSerializeMapping($tmp->k, $output, $done); // serialize adjacent node keys
$s .= implode($adj->k);
$mb->s .= $s;
$entry = new stdClass();
$entry->keys = $adj->k;
$entry->idx = 0;
$mb->keyStack[] = $entry;
$this->serializeMapping($mb);
}
} }
} }
return $rval;
}
/**
* Creates a relation serialization (partial or full).
*
* @param output the current mapping builder output.
*
* @return the relation serialization.
*/
public function serializeMapping($output)
{
return $this->recursiveSerializeMapping(
array('s1'), $output, new stdClass());
} }
/** /**
* Recursively serializes adjacent bnode combinations. * Recursively serializes adjacent bnode combinations.
* *
* @param s the serialization to update. * @param s the serialization to update.
* @param top the top of the serialization. * @param iri the IRI of the bnode being serialized.
* @param siri the serialization name for the bnode IRI.
* @param mb the MappingBuilder to use. * @param mb the MappingBuilder to use.
* @param dir the edge direction to use ('props' or 'refs'). * @param dir the edge direction to use ('props' or 'refs').
* @param mapped all of the already-mapped adjacent bnodes. * @param mapped all of the already-mapped adjacent bnodes.
* @param notMapped all of the not-yet mapped adjacent bnodes. * @param notMapped all of the not-yet mapped adjacent bnodes.
*/ */
public function serializeCombos( public function serializeCombos(
$s, $top, $mb, $dir, $mapped, $notMapped) $s, $iri, $siri, $mb, $dir, $mapped, $notMapped)
{ {
// copy mapped nodes
$mapped = _clone($mapped);
// handle recursion // handle recursion
if(count($notMapped) > 0) if(count($notMapped) > 0)
{ {
// copy mapped nodes
$mapped = _clone($mapped);
// map first bnode in list // map first bnode in list
$mapped->{$mb->mapNode($notMapped[0]->s)} = $notMapped[0]->s; $mapped->{$mb->mapNode($notMapped[0]->s)} = $notMapped[0]->s;
@ -2049,46 +2031,43 @@ class JsonLdProcessor
for($r = 0; $r < $rotations; ++$r) for($r = 0; $r < $rotations; ++$r)
{ {
$m = ($r === 0) ? $mb : $original->copy(); $m = ($r === 0) ? $mb : $original->copy();
$this->serializeCombos($s, $top, $m, $dir, $mapped, $notMapped); $this->serializeCombos(
$s, $iri, $siri, $m, $dir, $mapped, $notMapped);
// rotate not-mapped for next combination // rotate not-mapped for next combination
_rotate($notMapped); _rotate($notMapped);
} }
} }
// handle final adjacent node in current combination // no more adjacent bnodes to map, update serialization
else else
{ {
$keys = array_keys((array)$mapped); $keys = array_keys((array)$mapped);
sort($keys); sort($keys);
$mb->output->$top = new stdClass(); $entry = new stdClass();
$mb->output->$top->k = $keys; $entry->i = $iri;
$mb->output->$top->m = $mapped; $entry->k = $keys;
$entry->m = $mapped;
$mb->adj->$siri = $entry;
$this->serializeMapping($mb);
// optimize away mappings that are already too large // optimize away mappings that are already too large
$_s = $this->serializeMapping($mb->output); if($s->$dir === null or
if($s->$dir === null or _compareSerializations($_s, $s->$dir->s) <= 0) _compareSerializations($mb->s, $s->$dir->s) <= 0)
{ {
$oldCount = $mb->count;
// recurse into adjacent values // recurse into adjacent values
foreach($keys as $i => $k) foreach($keys as $i => $k)
{ {
$this->serializeBlankNode($s, $mapped->$k, $mb, $dir); $this->serializeBlankNode($s, $mapped->$k, $mb, $dir);
} }
// reserialize if more nodes were mapped
if($mb->count > $oldCount)
{
$_s = $this->serializeMapping($mb->output);
}
// update least serialization if new one has been found // update least serialization if new one has been found
$this->serializeMapping($mb);
if($s->$dir === null or if($s->$dir === null or
(_compareSerializations($_s, $s->$dir->s) <= 0 and (_compareSerializations($mb->s, $s->$dir->s) <= 0 and
count($_s) >= count($s->$dir->s))) strlen($mb->s) >= strlen($s->$dir->s)))
{ {
$s->$dir = new stdClass(); $s->$dir = new stdClass();
$s->$dir->s = $_s; $s->$dir->s = $mb->s;
$s->$dir->m = $mb->mapping; $s->$dir->m = $mb->mapping;
} }
} }
@ -2105,12 +2084,12 @@ class JsonLdProcessor
*/ */
public function serializeBlankNode($s, $iri, $mb, $dir) public function serializeBlankNode($s, $iri, $mb, $dir)
{ {
// only do mapping if iri not already mapped // only do mapping if iri not already processed
if(!property_exists($mb->mapped, $iri)) if(!property_exists($mb->processed, $iri))
{ {
// iri now mapped // iri now processed
$mb->mapped->$iri = true; $mb->processed->$iri = true;
$top = $mb->mapNode($iri); $siri = $mb->mapNode($iri);
// copy original mapping builder // copy original mapping builder
$original = $mb->copy(); $original = $mb->copy();
@ -2155,7 +2134,8 @@ class JsonLdProcessor
for($i = 0; $i < $combos; ++$i) for($i = 0; $i < $combos; ++$i)
{ {
$m = ($i === 0) ? $mb : $original->copy(); $m = ($i === 0) ? $mb : $original->copy();
$this->serializeCombos($s, $top, $mb, $dir, $mapped, $notMapped); $this->serializeCombos(
$s, $iri, $siri, $mb, $dir, $mapped, $notMapped);
} }
} }
} }