--- /dev/null
+/*
+ * Copyright (c) 2017, 2022 PANTHEON.tech, 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 org.antlr.v4.runtime.CharStreams;
+import org.antlr.v4.runtime.CommonTokenStream;
+import org.antlr.v4.runtime.ParserRuleContext;
+import org.antlr.v4.runtime.tree.TerminalNode;
+import org.eclipse.jdt.annotation.NonNullByDefault;
+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.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 IfFeaturePredicateParser {
+ private final StmtContext<?, ?, ?> stmt;
+
+ private IfFeaturePredicateParser(final StmtContext<?, ?, ?> stmt) {
+ this.stmt = requireNonNull(stmt);
+ }
+
+ static IfFeatureExpr parseIfFeatureExpression(final StmtContext<?, ?, ?> stmt, final String value) {
+ final var lexer = new IfFeatureExpressionLexer(CharStreams.fromString(value));
+ final var parser = new IfFeatureExpressionParser(new CommonTokenStream(lexer));
+ final var ifFeatureExprContext =
+ SourceExceptionParser.parse(lexer, parser, parser::if_feature_expr, stmt.sourceReference());
+ return new IfFeaturePredicateParser(stmt).parseIfFeatureExpr(ifFeatureExprContext);
+ }
+
+ private IfFeatureExpr parseIfFeatureExpr(final If_feature_exprContext expr) {
+ final int count = verifyExprOrTermChildren(expr);
+ final var expressions = ImmutableSet.<IfFeatureExpr>builderWithExpectedSize(count / 4 + 1);
+ for (int i = 0; i < count; i += 4) {
+ expressions.add(parseIfFeatureTerm(getChild(expr, i, If_feature_termContext.class)));
+ }
+ return IfFeatureExpr.or(expressions.build());
+ }
+
+ private IfFeatureExpr parseIfFeatureTerm(final If_feature_termContext term) {
+ final int count = verifyExprOrTermChildren(term);
+ final var expressions = ImmutableSet.<IfFeatureExpr>builderWithExpectedSize(count / 4 + 1);
+ expressions.add(parseIfFeatureFactor(getChild(term, 0, If_feature_factorContext.class)));
+
+ for (int i = 4; i < count; i += 4) {
+ expressions.add(parseIfFeatureTerm(getChild(term, i, If_feature_termContext.class)));
+ }
+ return IfFeatureExpr.and(expressions.build());
+ }
+
+ private IfFeatureExpr parseIfFeatureFactor(final If_feature_factorContext factor) {
+ final var first = factor.getChild(0);
+ if (first instanceof Identifier_ref_argContext refArg) {
+ return IfFeatureExpr.isPresent(StmtContextUtils.parseNodeIdentifier(stmt, refArg.getText()));
+ } else if (first instanceof TerminalNode terminal) {
+ return switch (terminal.getSymbol().getType()) {
+ case IfFeatureExpressionParser.LP ->
+ parseIfFeatureExpr(factor.getChild(If_feature_exprContext.class, 0));
+ case IfFeatureExpressionParser.NOT ->
+ parseIfFeatureFactor(getChild(factor, 2, If_feature_factorContext.class)).negate();
+ default -> throw new SourceException(stmt, "Unexpected terminal %s in sub-expression at %s",
+ terminal.getText(), factor.getSourceInterval());
+ };
+ } else {
+ throw new SourceException(stmt, "Unexpected error: sub-expression at %s has context %s. Please file a bug "
+ + "report with the corresponding model attached.", factor.getSourceInterval(), first);
+ }
+ }
+
+ private int verifyExprOrTermChildren(ParserRuleContext context) {
+ final int count = context.getChildCount();
+ if (count % 4 != 1) {
+ throw new SourceException(stmt, "Unexpected error: sub-expression at %s has %s children. Please file a bug "
+ + "report with the corresponding model attached.", context.getSourceInterval(), count);
+ }
+ return count;
+ }
+
+ private <T> T getChild(final ParserRuleContext parent, final int offset, final Class<T> clazz) {
+ final var child = parent.getChild(offset);
+ if (!clazz.isInstance(child)) {
+ throw new SourceException(stmt, "Unexpected error: sub-expression at %s has child %s at offset %s when "
+ + "expecting %s. Please file a bug report with the corresponding model attached.",
+ parent.getSourceInterval(), child, offset, clazz);
+ }
+ return clazz.cast(child);
+ }
+}
+++ /dev/null
-/*
- * 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;
-
-// FIXME: YANGTOOLS-1396: refactor on top of vanilla IfFeatureExpressionParser
-@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()));
- }
-}
Code Review / yangtools.git / commitdiff