yang/yang-parser-impl/src/main/java/org/opendaylight/yangtools/yang/parser/stmt/rfc6020/IfFeatureStatementImpl.java

   1 /*
   2  * Copyright (c) 2015 Cisco Systems, Inc. and others.  All rights reserved.
   3  *
   4  * This program and the accompanying materials are made available under the
   5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
   6  * and is available at http://www.eclipse.org/legal/epl-v10.html
   7  */
   8 package org.opendaylight.yangtools.yang.parser.stmt.rfc6020;
   9
  10 import com.google.common.base.Preconditions;
  11 import java.util.Set;
  12 import java.util.function.Predicate;
  13 import org.antlr.v4.runtime.ANTLRInputStream;
  14 import org.antlr.v4.runtime.CommonTokenStream;
  15 import org.opendaylight.yangtools.antlrv4.code.gen.IfFeatureExpressionLexer;
  16 import org.opendaylight.yangtools.antlrv4.code.gen.IfFeatureExpressionParser;
  17 import org.opendaylight.yangtools.antlrv4.code.gen.IfFeatureExpressionParser.Identifier_ref_argContext;
  18 import org.opendaylight.yangtools.antlrv4.code.gen.IfFeatureExpressionParser.If_feature_exprContext;
  19 import org.opendaylight.yangtools.antlrv4.code.gen.IfFeatureExpressionParser.If_feature_factorContext;
  20 import org.opendaylight.yangtools.antlrv4.code.gen.IfFeatureExpressionParser.If_feature_termContext;
  21 import org.opendaylight.yangtools.antlrv4.code.gen.IfFeatureExpressionParserBaseVisitor;
  22 import org.opendaylight.yangtools.yang.common.QName;
  23 import org.opendaylight.yangtools.yang.common.YangVersion;
  24 import org.opendaylight.yangtools.yang.model.api.YangStmtMapping;
  25 import org.opendaylight.yangtools.yang.model.api.meta.EffectiveStatement;
  26 import org.opendaylight.yangtools.yang.model.api.stmt.IfFeatureStatement;
  27 import org.opendaylight.yangtools.yang.parser.spi.SubstatementValidator;
  28 import org.opendaylight.yangtools.yang.parser.spi.meta.AbstractDeclaredStatement;
  29 import org.opendaylight.yangtools.yang.parser.spi.meta.AbstractStatementSupport;
  30 import org.opendaylight.yangtools.yang.parser.spi.meta.StmtContext;
  31 import org.opendaylight.yangtools.yang.parser.spi.source.SourceException;
  32 import org.opendaylight.yangtools.yang.parser.stmt.rfc6020.effective.IfFeatureEffectiveStatementImpl;
  33
  34 public class IfFeatureStatementImpl extends AbstractDeclaredStatement<Predicate<Set<QName>>>
  35         implements IfFeatureStatement {
  36     private static final SubstatementValidator SUBSTATEMENT_VALIDATOR = SubstatementValidator.builder(YangStmtMapping
  37             .IF_FEATURE)
  38             .build();
  39
  40     protected IfFeatureStatementImpl(
  41             final StmtContext<Predicate<Set<QName>>, IfFeatureStatement, ?> context) {
  42         super(context);
  43     }
  44
  45     public static class Definition
  46             extends
  47             AbstractStatementSupport<Predicate<Set<QName>>, IfFeatureStatement, EffectiveStatement<Predicate<Set<QName>>, IfFeatureStatement>> {
  48
  49         public Definition() {
  50             super(YangStmtMapping.IF_FEATURE);
  51         }
  52
  53         @Override
  54         public Predicate<Set<QName>> parseArgumentValue(final StmtContext<?, ?, ?> ctx, final String value) {
  55             if(YangVersion.VERSION_1_1.equals(ctx.getRootVersion())) {
  56                 return parseIfFeatureExpression(ctx, value);
  57             } else {
  58                 final QName qName = Utils.qNameFromArgument(ctx, value);
  59                 return setQNames -> setQNames.contains(qName);
  60             }
  61         }
  62
  63         @Override
  64         public IfFeatureStatement createDeclared(
  65                 final StmtContext<Predicate<Set<QName>>, IfFeatureStatement, ?> ctx) {
  66             return new IfFeatureStatementImpl(ctx);
  67         }
  68
  69         @Override
  70         public EffectiveStatement<Predicate<Set<QName>>, IfFeatureStatement> createEffective(
  71                 final StmtContext<Predicate<Set<QName>>, IfFeatureStatement, EffectiveStatement<Predicate<Set<QName>>, IfFeatureStatement>> ctx) {
  72             return new IfFeatureEffectiveStatementImpl(ctx);
  73         }
  74
  75         @Override
  76         protected SubstatementValidator getSubstatementValidator() {
  77             return SUBSTATEMENT_VALIDATOR;
  78         }
  79
  80         private static Predicate<Set<QName>> parseIfFeatureExpression(final StmtContext<?, ?, ?> ctx, final String value) {
  81             final IfFeatureExpressionLexer lexer = new IfFeatureExpressionLexer(new ANTLRInputStream(value));
  82             final CommonTokenStream tokens = new CommonTokenStream(lexer);
  83             final IfFeatureExpressionParser parser = new IfFeatureExpressionParser(tokens);
  84
  85             return new IfFeaturePredicateVisitor(ctx).visit(parser.if_feature_expr());
  86         }
  87
  88         private static class IfFeaturePredicateVisitor extends IfFeatureExpressionParserBaseVisitor<Predicate<Set<QName>>> {
  89             private final StmtContext<?, ?, ?> stmtCtx;
  90
  91             public IfFeaturePredicateVisitor(final StmtContext<?, ?, ?> ctx) {
  92                 this.stmtCtx = Preconditions.checkNotNull(ctx);
  93             }
  94
  95             @Override
  96             public Predicate<Set<QName>> visitIf_feature_expr(final If_feature_exprContext ctx) {
  97                 if (ctx.if_feature_expr() != null) {
  98                     return visitIf_feature_term(ctx.if_feature_term()).or(visitIf_feature_expr(ctx.if_feature_expr()));
  99                 } else {
 100                     return visitIf_feature_term(ctx.if_feature_term());
 101                 }
 102             }
 103
 104             @Override
 105             public Predicate<Set<QName>> visitIf_feature_term(final If_feature_termContext ctx) {
 106                 if (ctx.if_feature_term() != null) {
 107                     return visitIf_feature_factor(ctx.if_feature_factor()).and(visitIf_feature_term(ctx.if_feature_term()));
 108                 } else {
 109                     return visitIf_feature_factor(ctx.if_feature_factor());
 110                 }
 111             }
 112
 113             @Override
 114             public Predicate<Set<QName>> visitIf_feature_factor(final If_feature_factorContext ctx) {
 115                 if (ctx.if_feature_expr() != null) {
 116                     return visitIf_feature_expr(ctx.if_feature_expr());
 117                 } else if (ctx.if_feature_factor() != null) {
 118                     return visitIf_feature_factor(ctx.if_feature_factor()).negate();
 119                 } else if (ctx.identifier_ref_arg() != null) {
 120                     return visitIdentifier_ref_arg(ctx.identifier_ref_arg());
 121                 }
 122
 123                 throw new SourceException("Unexpected grammar context during parsing of IfFeature expression. "
 124                         + "Most probably IfFeature grammar has been changed.", stmtCtx.getStatementSourceReference());
 125             }
 126
 127             @Override
 128             public Predicate<Set<QName>> visitIdentifier_ref_arg(final Identifier_ref_argContext ctx) {
 129                 final QName featureQName = Utils.qNameFromArgument(stmtCtx, ctx.getText());
 130                 return setQNames -> setQNames.contains(featureQName);
 131             }
 132         }
 133     }
 134
 135     @Override
 136     public Predicate<Set<QName>> getIfFeaturePredicate() {
 137         return argument();
 138     }
 139 }