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