yang/yang-parser-rfc7950/src/main/java/org/opendaylight/yangtools/yang/parser/rfc7950/stmt/if_feature/IfFeaturePredicateVisitor.java

   1 /*
   2  * Copyright (c) 2017 Pantheon Technologies, s.r.o. 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.rfc7950.stmt.if_feature;
   9
  10 import static java.util.Objects.requireNonNull;
  11
  12 import java.util.Set;
  13 import java.util.function.Predicate;
  14 import org.antlr.v4.runtime.CharStreams;
  15 import org.antlr.v4.runtime.CommonTokenStream;
  16 import org.eclipse.jdt.annotation.NonNullByDefault;
  17 import org.eclipse.jdt.annotation.Nullable;
  18 import org.opendaylight.yangtools.antlrv4.code.gen.IfFeatureExpressionLexer;
  19 import org.opendaylight.yangtools.antlrv4.code.gen.IfFeatureExpressionParser;
  20 import org.opendaylight.yangtools.antlrv4.code.gen.IfFeatureExpressionParser.Identifier_ref_argContext;
  21 import org.opendaylight.yangtools.antlrv4.code.gen.IfFeatureExpressionParser.If_feature_exprContext;
  22 import org.opendaylight.yangtools.antlrv4.code.gen.IfFeatureExpressionParser.If_feature_factorContext;
  23 import org.opendaylight.yangtools.antlrv4.code.gen.IfFeatureExpressionParser.If_feature_termContext;
  24 import org.opendaylight.yangtools.antlrv4.code.gen.IfFeatureExpressionParserBaseVisitor;
  25 import org.opendaylight.yangtools.yang.common.QName;
  26 import org.opendaylight.yangtools.yang.parser.rfc7950.antlr.SourceExceptionParser;
  27 import org.opendaylight.yangtools.yang.parser.spi.meta.StmtContext;
  28 import org.opendaylight.yangtools.yang.parser.spi.meta.StmtContextUtils;
  29 import org.opendaylight.yangtools.yang.parser.spi.source.SourceException;
  30
  31 @NonNullByDefault
  32 final class IfFeaturePredicateVisitor extends IfFeatureExpressionParserBaseVisitor<Predicate<Set<QName>>> {
  33     private final StmtContext<?, ?, ?> stmtCtx;
  34
  35     private IfFeaturePredicateVisitor(final StmtContext<?, ?, ?> ctx) {
  36         this.stmtCtx = requireNonNull(ctx);
  37     }
  38
  39     static Predicate<Set<QName>> parseIfFeatureExpression(final StmtContext<?, ?, ?> ctx, final String value) {
  40         final IfFeatureExpressionLexer lexer = new IfFeatureExpressionLexer(CharStreams.fromString(value));
  41         final IfFeatureExpressionParser parser = new IfFeatureExpressionParser(new CommonTokenStream(lexer));
  42         return new IfFeaturePredicateVisitor(ctx).visit(SourceExceptionParser.parse(lexer, parser,
  43             parser::if_feature_expr, ctx.getStatementSourceReference()));
  44     }
  45
  46     @Override
  47     public Predicate<Set<QName>> visitIf_feature_expr(final @Nullable If_feature_exprContext ctx) {
  48         final Predicate<Set<QName>> term = visitIf_feature_term(ctx.if_feature_term());
  49         final If_feature_exprContext expr = ctx.if_feature_expr();
  50         return expr == null ? term : term.or(visitIf_feature_expr(expr));
  51     }
  52
  53     @Override
  54     public Predicate<Set<QName>> visitIf_feature_term(final @Nullable If_feature_termContext ctx) {
  55         final Predicate<Set<QName>> factor = visitIf_feature_factor(ctx.if_feature_factor());
  56         final If_feature_termContext term = ctx.if_feature_term();
  57         return term == null ? factor : factor.and(visitIf_feature_term(term));
  58     }
  59
  60     @Override
  61     public Predicate<Set<QName>> visitIf_feature_factor(final @Nullable If_feature_factorContext ctx) {
  62         if (ctx.if_feature_expr() != null) {
  63             return visitIf_feature_expr(ctx.if_feature_expr());
  64         } else if (ctx.if_feature_factor() != null) {
  65             return visitIf_feature_factor(ctx.if_feature_factor()).negate();
  66         } else if (ctx.identifier_ref_arg() != null) {
  67             return visitIdentifier_ref_arg(ctx.identifier_ref_arg());
  68         }
  69
  70         throw new SourceException("Unexpected grammar context during parsing of IfFeature expression. "
  71                 + "Most probably IfFeature grammar has been changed.", stmtCtx.getStatementSourceReference());
  72     }
  73
  74     @Override
  75     public Predicate<Set<QName>> visitIdentifier_ref_arg(final @Nullable Identifier_ref_argContext ctx) {
  76         final QName featureQName = StmtContextUtils.parseNodeIdentifier(stmtCtx, ctx.getText());
  77         return setQNames -> setQNames.contains(featureQName);
  78     }
  79 }