Populate parser/ hierarchy

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

diff --git a/parser/yang-parser-rfc7950/src/main/java/org/opendaylight/yangtools/yang/parser/rfc7950/stmt/if_feature/IfFeaturePredicateVisitor.java b/parser/yang-parser-rfc7950/src/main/java/org/opendaylight/yangtools/yang/parser/rfc7950/stmt/if_feature/IfFeaturePredicateVisitor.java
new file mode 100644 (file)
index 0000000..d0777d2
--- /dev/null
+++ b/parser/yang-parser-rfc7950/src/main/java/org/opendaylight/yangtools/yang/parser/rfc7950/stmt/if_feature/IfFeaturePredicateVisitor.java
@@ -0,0 +1,89 @@
+/*
+ * Copyright (c) 2017 Pantheon Technologies, s.r.o. and others.  All rights reserved.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v1.0 which accompanies this distribution,
+ * and is available at http://www.eclipse.org/legal/epl-v10.html
+ */
+package org.opendaylight.yangtools.yang.parser.rfc7950.stmt.if_feature;
+
+import static java.util.Objects.requireNonNull;
+
+import com.google.common.collect.ImmutableSet;
+import java.util.ArrayList;
+import java.util.List;
+import org.antlr.v4.runtime.CharStreams;
+import org.antlr.v4.runtime.CommonTokenStream;
+import org.eclipse.jdt.annotation.NonNullByDefault;
+import org.eclipse.jdt.annotation.Nullable;
+import org.opendaylight.yangtools.yang.model.api.stmt.IfFeatureExpr;
+import org.opendaylight.yangtools.yang.parser.antlr.IfFeatureExpressionLexer;
+import org.opendaylight.yangtools.yang.parser.antlr.IfFeatureExpressionParser;
+import org.opendaylight.yangtools.yang.parser.antlr.IfFeatureExpressionParser.Identifier_ref_argContext;
+import org.opendaylight.yangtools.yang.parser.antlr.IfFeatureExpressionParser.If_feature_exprContext;
+import org.opendaylight.yangtools.yang.parser.antlr.IfFeatureExpressionParser.If_feature_factorContext;
+import org.opendaylight.yangtools.yang.parser.antlr.IfFeatureExpressionParser.If_feature_termContext;
+import org.opendaylight.yangtools.yang.parser.antlr.IfFeatureExpressionParserBaseVisitor;
+import org.opendaylight.yangtools.yang.parser.rfc7950.antlr.SourceExceptionParser;
+import org.opendaylight.yangtools.yang.parser.spi.meta.StmtContext;
+import org.opendaylight.yangtools.yang.parser.spi.meta.StmtContextUtils;
+import org.opendaylight.yangtools.yang.parser.spi.source.SourceException;
+
+@NonNullByDefault
+final class IfFeaturePredicateVisitor extends IfFeatureExpressionParserBaseVisitor<IfFeatureExpr> {
+    private final StmtContext<?, ?, ?> stmtCtx;
+
+    private IfFeaturePredicateVisitor(final StmtContext<?, ?, ?> ctx) {
+        this.stmtCtx = requireNonNull(ctx);
+    }
+
+    static IfFeatureExpr parseIfFeatureExpression(final StmtContext<?, ?, ?> ctx, final String value) {
+        final IfFeatureExpressionLexer lexer = new IfFeatureExpressionLexer(CharStreams.fromString(value));
+        final IfFeatureExpressionParser parser = new IfFeatureExpressionParser(new CommonTokenStream(lexer));
+        final IfFeatureExpr ret = new IfFeaturePredicateVisitor(ctx).visit(SourceExceptionParser.parse(lexer, parser,
+            parser::if_feature_expr, ctx.sourceReference()));
+
+        return ret;
+    }
+
+    @Override
+    public IfFeatureExpr visitIf_feature_expr(final @Nullable If_feature_exprContext ctx) {
+        return IfFeatureExpr.or(ctx.if_feature_term().stream()
+            .map(this::visitIf_feature_term)
+            .collect(ImmutableSet.toImmutableSet()));
+    }
+
+    @Override
+    public IfFeatureExpr visitIf_feature_term(final @Nullable If_feature_termContext ctx) {
+        final IfFeatureExpr factor = visitIf_feature_factor(ctx.if_feature_factor());
+        final List<If_feature_termContext> terms = ctx.if_feature_term();
+        if (terms == null || terms.isEmpty()) {
+            return factor;
+        }
+        final List<IfFeatureExpr> factors = new ArrayList<>(terms.size() + 1);
+        factors.add(factor);
+        for (If_feature_termContext term : terms) {
+            factors.add(visitIf_feature_term(term));
+        }
+        return IfFeatureExpr.and(ImmutableSet.copyOf(factors));
+    }
+
+    @Override
+    public IfFeatureExpr visitIf_feature_factor(final @Nullable If_feature_factorContext ctx) {
+        if (ctx.if_feature_expr() != null) {
+            return visitIf_feature_expr(ctx.if_feature_expr());
+        } else if (ctx.if_feature_factor() != null) {
+            return visitIf_feature_factor(ctx.if_feature_factor()).negate();
+        } else if (ctx.identifier_ref_arg() != null) {
+            return visitIdentifier_ref_arg(ctx.identifier_ref_arg());
+        }
+
+        throw new SourceException("Unexpected grammar context during parsing of IfFeature expression. "
+                + "Most probably IfFeature grammar has been changed.", stmtCtx);
+    }
+
+    @Override
+    public IfFeatureExpr visitIdentifier_ref_arg(final @Nullable Identifier_ref_argContext ctx) {
+        return IfFeatureExpr.isPresent(StmtContextUtils.parseNodeIdentifier(stmtCtx, ctx.getText()));
+    }
+}