| /* |
| * Copyright 2016-present Open Networking Laboratory |
| * |
| * Licensed 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.onosproject.yangutils.parser.impl.listeners; |
| |
| import org.onosproject.yangutils.datamodel.YangWhen; |
| import org.onosproject.yangutils.datamodel.YangWhenHolder; |
| import org.onosproject.yangutils.datamodel.utils.Parsable; |
| import org.onosproject.yangutils.parser.antlrgencode.GeneratedYangParser; |
| import org.onosproject.yangutils.parser.exceptions.ParserException; |
| import org.onosproject.yangutils.parser.impl.TreeWalkListener; |
| |
| import static org.onosproject.yangutils.datamodel.utils.YangConstructType.WHEN_DATA; |
| import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.ENTRY; |
| import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.EXIT; |
| import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructListenerErrorMessage; |
| import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.INVALID_HOLDER; |
| import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_CURRENT_HOLDER; |
| import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_HOLDER; |
| import static org.onosproject.yangutils.parser.impl.parserutils.ListenerUtil.removeQuotesAndHandleConcat; |
| import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.checkStackIsNotEmpty; |
| |
| /* |
| * Reference: RFC6020 and YANG ANTLR Grammar |
| * |
| * ABNF grammar as per RFC6020 |
| * |
| * when-stmt = when-keyword sep string optsep |
| * (";" / |
| * "{" stmtsep |
| * ;; these stmts can appear in any order |
| * [description-stmt stmtsep] |
| * [reference-stmt stmtsep] |
| * "}") |
| * |
| * ANTLR grammar rule |
| * whenStatement : WHEN_KEYWORD string (STMTEND | LEFT_CURLY_BRACE ((descriptionStatement? referenceStatement?) |
| * | (referenceStatement? descriptionStatement?)) RIGHT_CURLY_BRACE); |
| */ |
| |
| /** |
| * Represents listener based call back function corresponding to the |
| * "when" rule defined in ANTLR grammar file for corresponding ABNF rule |
| * in RFC 6020. |
| */ |
| public final class WhenListener { |
| |
| /** |
| * Creates a new when listener. |
| */ |
| private WhenListener() { |
| } |
| |
| /** |
| * Perform validations and updates the data model tree.It is called when parser |
| * receives an input matching the grammar rule (when). |
| * |
| * @param listener listener's object |
| * @param ctx context object of the grammar rule |
| */ |
| public static void processWhenEntry(TreeWalkListener listener, |
| GeneratedYangParser.WhenStatementContext ctx) { |
| |
| // Check for stack to be non empty. |
| checkStackIsNotEmpty(listener, MISSING_HOLDER, WHEN_DATA, ctx.string().getText(), ENTRY); |
| String condition = removeQuotesAndHandleConcat(ctx.string().getText()); |
| |
| YangWhenHolder whenHolder; |
| |
| // Obtain the node of the stack. |
| Parsable tmpNode = listener.getParsedDataStack().peek(); |
| if (tmpNode instanceof YangWhenHolder) { |
| whenHolder = (YangWhenHolder) tmpNode; |
| |
| YangWhen when = new YangWhen(); |
| when.setCondition(condition); |
| |
| whenHolder.setWhen(when); |
| listener.getParsedDataStack().push(when); |
| } else { |
| throw new ParserException(constructListenerErrorMessage(INVALID_HOLDER, |
| WHEN_DATA, ctx.string().getText(), ENTRY)); |
| } |
| } |
| |
| /** |
| * Performs validation and updates the data model tree.It is called when parser |
| * exits from grammar rule (when). |
| * |
| * @param listener listener's object |
| * @param ctx context object of the grammar rule |
| */ |
| public static void processWhenExit(TreeWalkListener listener, |
| GeneratedYangParser.WhenStatementContext ctx) { |
| |
| // Check for stack to be non empty. |
| checkStackIsNotEmpty(listener, MISSING_HOLDER, WHEN_DATA, ctx.string().getText(), EXIT); |
| |
| if (listener.getParsedDataStack().peek() instanceof YangWhen) { |
| listener.getParsedDataStack().pop(); |
| } else { |
| throw new ParserException(constructListenerErrorMessage(MISSING_CURRENT_HOLDER, WHEN_DATA, |
| ctx.string().getText(), EXIT)); |
| } |
| } |
| } |