| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| |
| package org.apache.tinkerpop.gremlin.process.traversal.translator; |
| |
| import org.apache.commons.configuration2.ConfigurationConverter; |
| import org.apache.commons.text.StringEscapeUtils; |
| import org.apache.tinkerpop.gremlin.process.traversal.Bytecode; |
| import org.apache.tinkerpop.gremlin.process.traversal.P; |
| import org.apache.tinkerpop.gremlin.process.traversal.SackFunctions; |
| import org.apache.tinkerpop.gremlin.process.traversal.Script; |
| import org.apache.tinkerpop.gremlin.process.traversal.TextP; |
| import org.apache.tinkerpop.gremlin.process.traversal.Translator; |
| import org.apache.tinkerpop.gremlin.process.traversal.Traversal; |
| import org.apache.tinkerpop.gremlin.process.traversal.TraversalSource; |
| import org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.GraphTraversal; |
| import org.apache.tinkerpop.gremlin.process.traversal.step.TraversalOptionParent; |
| import org.apache.tinkerpop.gremlin.process.traversal.strategy.TraversalStrategyProxy; |
| import org.apache.tinkerpop.gremlin.process.traversal.util.ConnectiveP; |
| import org.apache.tinkerpop.gremlin.process.traversal.util.OrP; |
| import org.apache.tinkerpop.gremlin.structure.Edge; |
| import org.apache.tinkerpop.gremlin.structure.Vertex; |
| import org.apache.tinkerpop.gremlin.structure.VertexProperty; |
| import org.apache.tinkerpop.gremlin.structure.util.StringFactory; |
| import org.apache.tinkerpop.gremlin.util.function.Lambda; |
| |
| import java.lang.reflect.Method; |
| import java.math.BigDecimal; |
| import java.sql.Timestamp; |
| import java.util.Date; |
| import java.util.HashMap; |
| import java.util.Iterator; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Set; |
| import java.util.UUID; |
| import java.util.stream.Collectors; |
| import java.util.stream.Stream; |
| |
| /** |
| * Translates Gremlin {@link Bytecode} into a Python string representation. |
| * |
| * @author Marko A. Rodriguez (http://markorodriguez.com) |
| * @author Stephen Mallette (http://stephen.genoprime.com) |
| */ |
| public final class PythonTranslator implements Translator.ScriptTranslator { |
| |
| private static final Set<String> STEP_NAMES = Stream.of(GraphTraversal.class.getMethods()).filter( |
| method -> Traversal.class.isAssignableFrom(method.getReturnType())).map(Method::getName). |
| collect(Collectors.toSet()); |
| |
| private final String traversalSource; |
| private final TypeTranslator typeTranslator; |
| |
| private PythonTranslator(final String traversalSource, final TypeTranslator typeTranslator) { |
| this.traversalSource = traversalSource; |
| this.typeTranslator = typeTranslator; |
| } |
| |
| /** |
| * Creates the translator with a {@code false} argument to {@code withParameters} using |
| * {@link #of(String, boolean)}. |
| */ |
| public static PythonTranslator of(final String traversalSource) { |
| return of(traversalSource, false); |
| } |
| |
| /** |
| * Creates the translator with the {@link DefaultTypeTranslator} passing the {@code withParameters} option to it |
| * which will handle type translation in a fashion that should typically increase cache hits and reduce |
| * compilation times if enabled at the sacrifice to rewriting of the script that could reduce readability. |
| */ |
| public static PythonTranslator of(final String traversalSource, final boolean withParameters) { |
| return of(traversalSource, new DefaultTypeTranslator(withParameters)); |
| } |
| |
| /** |
| * Creates the translator with a custom {@link TypeTranslator} instance. |
| */ |
| public static PythonTranslator of(final String traversalSource, final TypeTranslator typeTranslator) { |
| return new PythonTranslator(traversalSource, typeTranslator); |
| } |
| |
| @Override |
| public String getTraversalSource() { |
| return this.traversalSource; |
| } |
| |
| @Override |
| public Script translate(final Bytecode bytecode) { |
| return typeTranslator.apply(traversalSource, bytecode); |
| } |
| |
| @Override |
| public String getTargetLanguage() { |
| return "gremlin-python"; |
| } |
| |
| @Override |
| public String toString() { |
| return StringFactory.translatorString(this); |
| } |
| |
| /////// |
| |
| /** |
| * Performs standard type translation for the TinkerPop types to Python. |
| */ |
| public static class DefaultTypeTranslator extends AbstractTypeTranslator { |
| |
| public DefaultTypeTranslator(final boolean withParameters) { |
| super(withParameters); |
| } |
| |
| @Override |
| protected String getNullSyntax() { |
| return "None"; |
| } |
| |
| @Override |
| protected String getSyntax(final String o) { |
| return o.contains("'") || o.contains(System.lineSeparator()) ? |
| "\"\"\"" + o + "\"\"\"" : "'" + o + "'"; |
| } |
| |
| @Override |
| protected String getSyntax(final Boolean o) { |
| return o ? "True" : "False"; |
| } |
| |
| @Override |
| protected String getSyntax(final Date o) { |
| return "datetime.datetime.utcfromtimestamp(" + o.getTime() + " / 1000.0)"; |
| } |
| |
| @Override |
| protected String getSyntax(final Timestamp o) { |
| return "timestamp(" + o.getTime() + " / 1000.0)"; |
| } |
| |
| @Override |
| protected String getSyntax(final UUID o) { |
| return "UUID('" + o.toString() +"')"; |
| } |
| |
| @Override |
| protected String getSyntax(final Lambda o) { |
| final String lambdaString = o.getLambdaScript().trim(); |
| return "lambda: \"" + StringEscapeUtils.escapeJava(lambdaString) + "\""; |
| } |
| |
| @Override |
| protected String getSyntax(final Number o) { |
| // todo: nan/inf |
| // all int/short/BigInteger/long are just python int/bignum |
| if (o instanceof Double || o instanceof Float || o instanceof BigDecimal) |
| return "float(" + o + ")"; |
| else if (o instanceof Byte) |
| return "SingleByte(" + o + ")"; |
| else |
| return o.toString(); |
| } |
| |
| @Override |
| protected String getSyntax(final SackFunctions.Barrier o) { |
| return "Barrier." + resolveSymbol(o.toString()); |
| } |
| |
| @Override |
| protected String getSyntax(final VertexProperty.Cardinality o) { |
| return "Cardinality." + resolveSymbol(o.toString()); |
| } |
| |
| @Override |
| protected String getSyntax(final TraversalOptionParent.Pick o) { |
| return "Pick." + resolveSymbol(o.toString()); |
| } |
| |
| @Override |
| protected Script produceScript(final Set<?> o) { |
| final Iterator<?> iterator = o.iterator(); |
| script.append("set("); |
| while(iterator.hasNext()) { |
| convertToScript(iterator.next()); |
| if (iterator.hasNext()) |
| script.append(","); |
| } |
| return script.append(")"); |
| } |
| |
| @Override |
| protected Script produceScript(final List<?> o) { |
| final Iterator<?> iterator = o.iterator(); |
| script.append("["); |
| while(iterator.hasNext()) { |
| convertToScript(iterator.next()); |
| if (iterator.hasNext()) |
| script.append(","); |
| } |
| return script.append("]"); |
| } |
| |
| @Override |
| protected Script produceScript(final Map<?, ?> o) { |
| script.append("{"); |
| final Iterator<? extends Map.Entry<?, ?>> itty = o.entrySet().iterator(); |
| while (itty.hasNext()) { |
| final Map.Entry<?,?> entry = itty.next(); |
| convertToScript(entry.getKey()).append(":"); |
| convertToScript(entry.getValue()); |
| if (itty.hasNext()) |
| script.append(","); |
| } |
| return script.append("}"); |
| } |
| |
| @Override |
| protected Script produceScript(final Class<?> o) { |
| return script.append("GremlinType(" + o.getCanonicalName() + ")"); |
| } |
| |
| @Override |
| protected Script produceScript(final Enum<?> o) { |
| return script.append(o.getDeclaringClass().getSimpleName() + "." + resolveSymbol(o.toString())); |
| } |
| |
| @Override |
| protected Script produceScript(final Vertex o) { |
| script.append("Vertex("); |
| convertToScript(o.id()).append(","); |
| return convertToScript(o.label()).append(")"); |
| } |
| |
| @Override |
| protected Script produceScript(final Edge o) { |
| script.append("Edge("); |
| convertToScript(o.id()).append(","); |
| convertToScript(o.outVertex()).append(","); |
| convertToScript(o.label()).append(","); |
| return convertToScript(o.inVertex()).append(")"); |
| } |
| |
| @Override |
| protected Script produceScript(final VertexProperty<?> o) { |
| script.append("VertexProperty("); |
| convertToScript(o.id()).append(","); |
| convertToScript(o.label()).append(","); |
| return convertToScript(o.value()).append(")"); |
| } |
| |
| @Override |
| protected Script produceScript(final TraversalStrategyProxy<?> o) { |
| if (o.getConfiguration().isEmpty()) |
| return script.append("TraversalStrategy('" + o.getStrategyClass().getSimpleName() + "', None, '" + o.getStrategyClass().getName() + "')"); |
| else { |
| script.append("TraversalStrategy('").append(o.getStrategyClass().getSimpleName()).append("',"); |
| convertToScript(ConfigurationConverter.getMap(o.getConfiguration())); |
| script.append(", '"); |
| script.append(o.getStrategyClass().getName()); |
| return script.append("')"); |
| } |
| } |
| |
| @Override |
| protected Script produceScript(final String traversalSource, final Bytecode o) { |
| script.append(traversalSource); |
| for (final Bytecode.Instruction instruction : o.getInstructions()) { |
| final String methodName = instruction.getOperator(); |
| final Object[] arguments = instruction.getArguments(); |
| if (0 == arguments.length) |
| script.append(".").append(resolveSymbol(methodName)).append("()"); |
| else if (methodName.equals("range") && 2 == arguments.length) |
| if (((Number) arguments[0]).longValue() + 1 == ((Number) arguments[1]).longValue()) |
| script.append("[").append(arguments[0].toString()).append("]"); |
| else |
| script.append("[").append(arguments[0].toString()).append(":").append(arguments[1].toString()).append("]"); |
| else if (methodName.equals("limit") && 1 == arguments.length) |
| script.append("[0:").append(arguments[0].toString()).append("]"); |
| else if (methodName.equals("values") && 1 == arguments.length && script.getScript().length() > 3 && !STEP_NAMES.contains(arguments[0].toString())) |
| script.append(".").append(arguments[0].toString()); |
| else { |
| script.append(".").append(resolveSymbol(methodName)).append("("); |
| |
| // python has trouble with java varargs...wrapping in collection seems to solve the problem |
| final boolean varargsBeware = instruction.getOperator().equals(TraversalSource.Symbols.withStrategies) |
| || instruction.getOperator().equals(TraversalSource.Symbols.withoutStrategies); |
| if (varargsBeware) script.append("*["); |
| |
| final Iterator<?> itty = Stream.of(arguments).iterator(); |
| while (itty.hasNext()) { |
| convertToScript(itty.next()); |
| if (itty.hasNext()) script.append(","); |
| } |
| |
| if (varargsBeware) script.append("]"); |
| |
| script.append(")"); |
| } |
| } |
| return script; |
| } |
| |
| @Override |
| protected Script produceScript(final P<?> p) { |
| if (p instanceof TextP) { |
| script.append("TextP.").append(resolveSymbol(p.getBiPredicate().toString())).append("("); |
| convertToScript(p.getValue()); |
| } else if (p instanceof ConnectiveP) { |
| // ConnectiveP gets some special handling because it's reduced to and(P, P, P) and we want it |
| // generated the way it was written which was P.and(P).and(P) |
| final List<P<?>> list = ((ConnectiveP) p).getPredicates(); |
| final String connector = p instanceof OrP ? "or_" : "and_"; |
| for (int i = 0; i < list.size(); i++) { |
| produceScript(list.get(i)); |
| |
| // for the first/last P there is no parent to close |
| if (i > 0 && i < list.size() - 1) script.append(")"); |
| |
| // add teh connector for all but last P |
| if (i < list.size() - 1) { |
| script.append(".").append(connector).append("("); |
| } |
| } |
| } else { |
| script.append("P.").append(resolveSymbol(p.getBiPredicate().toString())).append("("); |
| convertToScript(p.getValue()); |
| } |
| script.append(")"); |
| return script; |
| } |
| |
| protected String resolveSymbol(final String methodName) { |
| return SymbolHelper.toPython(methodName); |
| } |
| } |
| |
| static final class SymbolHelper { |
| |
| private final static Map<String, String> TO_PYTHON_MAP = new HashMap<>(); |
| private final static Map<String, String> FROM_PYTHON_MAP = new HashMap<>(); |
| |
| static { |
| TO_PYTHON_MAP.put("global", "global_"); |
| TO_PYTHON_MAP.put("as", "as_"); |
| TO_PYTHON_MAP.put("in", "in_"); |
| TO_PYTHON_MAP.put("and", "and_"); |
| TO_PYTHON_MAP.put("or", "or_"); |
| TO_PYTHON_MAP.put("is", "is_"); |
| TO_PYTHON_MAP.put("not", "not_"); |
| TO_PYTHON_MAP.put("from", "from_"); |
| TO_PYTHON_MAP.put("list", "list_"); |
| TO_PYTHON_MAP.put("set", "set_"); |
| TO_PYTHON_MAP.put("all", "all_"); |
| TO_PYTHON_MAP.put("with", "with_"); |
| // |
| TO_PYTHON_MAP.forEach((k, v) -> FROM_PYTHON_MAP.put(v, k)); |
| } |
| |
| private SymbolHelper() { |
| // static methods only, do not instantiate |
| } |
| |
| public static String toPython(final String symbol) { |
| return TO_PYTHON_MAP.getOrDefault(symbol, symbol); |
| } |
| |
| public static String toJava(final String symbol) { |
| return FROM_PYTHON_MAP.getOrDefault(symbol, symbol); |
| } |
| |
| } |
| } |