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CypherMatchersCreator.java
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CypherMatchersCreator.java
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/*
* Copyright (c) 2002-2016 "Neo Technology,"
* Network Engine for Objects in Lund AB [http://neotechnology.com]
*
* This file is part of Neo4j.
*
* Neo4j is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package cypher.feature.parser;
import cypher.feature.parser.matchers.BooleanMatcher;
import cypher.feature.parser.matchers.FloatMatcher;
import cypher.feature.parser.matchers.IntegerMatcher;
import cypher.feature.parser.matchers.ListMatcher;
import cypher.feature.parser.matchers.MapMatcher;
import cypher.feature.parser.matchers.NodeMatcher;
import cypher.feature.parser.matchers.PathLinkMatcher;
import cypher.feature.parser.matchers.PathMatcher;
import cypher.feature.parser.matchers.RelationshipMatcher;
import cypher.feature.parser.matchers.StringMatcher;
import cypher.feature.parser.matchers.UnorderedListMatcher;
import cypher.feature.parser.matchers.ValueMatcher;
import org.opencypher.tools.tck.parsing.generated.FeatureResultsBaseListener;
import org.opencypher.tools.tck.parsing.generated.FeatureResultsParser;
import java.util.ArrayList;
import java.util.Deque;
import java.util.HashMap;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.Map;
import java.util.Set;
class CypherMatchersCreator extends FeatureResultsBaseListener
{
private final Deque<ValueMatcher> workload;
private final Deque<Integer> listCounters;
private final Deque<Integer> mapCounters;
private final Deque<String> keys;
private final Deque<String> names;
private final Deque<PathLinkMatcher> pathElements;
private boolean unorderedLists;
private static final String INFINITY = "Inf";
CypherMatchersCreator()
{
this.workload = new LinkedList<>();
this.keys = new LinkedList<>();
this.listCounters = new LinkedList<>();
this.mapCounters = new LinkedList<>();
this.names = new LinkedList<>();
this.pathElements = new LinkedList<>();
this.unorderedLists = false;
}
ValueMatcher parsed()
{
return workload.pop();
}
CypherMatchersCreator setLists( boolean unordered )
{
unorderedLists = unordered;
return this;
}
@Override
public void enterInteger( FeatureResultsParser.IntegerContext ctx )
{
workload.push( new IntegerMatcher( Long.valueOf( ctx.getText() ) ) );
}
@Override
public void enterNullValue( FeatureResultsParser.NullValueContext ctx )
{
workload.push( ValueMatcher.NULL_MATCHER );
}
@Override
public void enterFloatingPoint( FeatureResultsParser.FloatingPointContext ctx )
{
String text = ctx.getText();
if ( text.contains( INFINITY ) )
{
workload.push( new FloatMatcher( Double.parseDouble( text + "inity" ) ) );
}
else
{
workload.push( new FloatMatcher( Double.parseDouble( text ) ) );
}
}
@Override
public void enterBool( FeatureResultsParser.BoolContext ctx )
{
workload.push( new BooleanMatcher( Boolean.valueOf( ctx.getText() ) ) );
}
@Override
public void enterString( FeatureResultsParser.StringContext ctx )
{
String text = ctx.getText();
String substring = text.substring( 1,
text.length() - 1 ); // remove wrapping quotes -- because I can't get the parser rules correct :(
String escaped = substring.replace( "\\'", "'" ); // remove escaping backslash -- see above comment
workload.push( new StringMatcher( escaped ) );
}
@Override
public void enterList( FeatureResultsParser.ListContext ctx )
{
listCounters.push( 0 );
}
@Override
public void enterListElement( FeatureResultsParser.ListElementContext ctx )
{
listCounters.push( listCounters.pop() + 1 );
}
@Override
public void exitList( FeatureResultsParser.ListContext ctx )
{
// Using a LinkedList here in order to be able to prepend
LinkedList<ValueMatcher> temp = new LinkedList<>();
int counter = listCounters.pop();
for ( int i = 0; i < counter; ++i )
{
temp.addFirst( workload.pop() );
}
if ( unorderedLists )
{
workload.push( new UnorderedListMatcher( temp ) );
}
else
{
workload.push( new ListMatcher( temp ) );
}
}
@Override
public void enterPropertyMap( FeatureResultsParser.PropertyMapContext ctx )
{
mapCounters.push( 0 );
}
@Override
public void enterKeyValuePair( FeatureResultsParser.KeyValuePairContext ctx )
{
mapCounters.push( mapCounters.pop() + 1 );
}
@Override
public void exitPropertyMap( FeatureResultsParser.PropertyMapContext ctx )
{
int counter = mapCounters.pop();
Map<String,ValueMatcher> map = new HashMap<>();
for ( int i = 0; i < counter; ++i )
{
ValueMatcher value = workload.pop();
String key = keys.pop();
map.put( key, value );
}
workload.push( new MapMatcher( map ) );
}
@Override
public void enterPropertyKey( FeatureResultsParser.PropertyKeyContext ctx )
{
keys.push( ctx.getText() );
}
@Override
public void enterLabelName( FeatureResultsParser.LabelNameContext ctx )
{
names.push( ctx.getText() );
}
@Override
public void exitNodeDesc( FeatureResultsParser.NodeDescContext ctx )
{
MapMatcher properties = getMapMatcher();
Set<String> labelNames = new HashSet<>();
while ( !names.isEmpty() )
{
labelNames.add( names.pop() );
}
workload.push( new NodeMatcher( labelNames, properties ) );
}
private MapMatcher getMapMatcher()
{
if ( workload.peek() instanceof MapMatcher )
{
return (MapMatcher) workload.pop();
}
else
{
return MapMatcher.EMPTY;
}
}
@Override
public void enterRelationshipTypeName( FeatureResultsParser.RelationshipTypeNameContext ctx )
{
names.push( ctx.getText() );
}
@Override
public void exitRelationshipDesc( FeatureResultsParser.RelationshipDescContext ctx )
{
MapMatcher properties = getMapMatcher();
String relTypeName = names.pop();
workload.push( new RelationshipMatcher( relTypeName, properties ) );
}
@Override
public void exitForwardsRelationship( FeatureResultsParser.ForwardsRelationshipContext ctx )
{
constructPartialPathLink( true );
}
@Override
public void exitBackwardsRelationship( FeatureResultsParser.BackwardsRelationshipContext ctx )
{
constructPartialPathLink( false );
}
private void constructPartialPathLink( boolean outgoing )
{
// On the workload there is a RelationshipMatcher
RelationshipMatcher relMatcher = (RelationshipMatcher) workload.pop();
// On the workload there is now a NodeMatcher, which is the start node for this relationship
NodeMatcher startNode = (NodeMatcher) workload.pop();
pathElements.push( new PathLinkMatcher( relMatcher, startNode, outgoing ) );
}
@Override
public void exitPathLink( FeatureResultsParser.PathLinkContext ctx )
{
// On the workload there is a NodeMatcher, which is the end node of the last pathLink in pathElements
NodeMatcher nodeMatcher = (NodeMatcher) workload.peek();
pathElements.peek().setRightNode( nodeMatcher );
}
@Override
public void exitPath( FeatureResultsParser.PathContext ctx )
{
// On the workload there is a NodeMatcher, and then zero or more (pathLength) PathLinkMatchers
NodeMatcher singleNodePath = (NodeMatcher) workload.pop();
if ( pathElements.isEmpty() )
{
workload.push( new PathMatcher( singleNodePath ) );
}
else
{
ArrayList<PathLinkMatcher> pathLinkMatchers = new ArrayList<>();
pathElements.descendingIterator().forEachRemaining( pathLinkMatchers::add );
pathElements.clear();
workload.push( new PathMatcher( pathLinkMatchers ) );
}
}
}