| /* |
| * Copyright 2016 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.YangModule; |
| import org.onosproject.yangutils.datamodel.YangRevision; |
| import org.onosproject.yangutils.datamodel.YangSubModule; |
| import org.onosproject.yangutils.parser.Parsable; |
| import org.onosproject.yangutils.parser.ParsableDataType; |
| import org.onosproject.yangutils.parser.antlrgencode.GeneratedYangParser; |
| import org.onosproject.yangutils.parser.exceptions.ParserException; |
| import org.onosproject.yangutils.parser.impl.TreeWalkListener; |
| import org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation; |
| import org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction; |
| import org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType; |
| import org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation; |
| |
| /* |
| * Reference: RFC6020 and YANG ANTLR Grammar |
| * |
| * ABNF grammar as per RFC6020 |
| * module-stmt = optsep module-keyword sep identifier-arg-str |
| * optsep |
| * "{" stmtsep |
| * module-header-stmts |
| * linkage-stmts |
| * meta-stmts |
| * revision-stmts |
| * body-stmts |
| * "}" optsep |
| * |
| * revision-stmt = revision-keyword sep revision-date optsep |
| * (";" / |
| * "{" stmtsep |
| * [description-stmt stmtsep] |
| * [reference-stmt stmtsep] |
| * "}") |
| * |
| * ANTLR grammar rule |
| * module_stmt : MODULE_KEYWORD IDENTIFIER LEFT_CURLY_BRACE module_body* RIGHT_CURLY_BRACE; |
| * |
| * revision_stmt : REVISION_KEYWORD DATE_ARG (STMTEND | LEFT_CURLY_BRACE revision_stmt_body RIGHT_CURLY_BRACE); |
| * revision_stmt_body : description_stmt? reference_stmt?; |
| */ |
| |
| /** |
| * Implements listener based call back function corresponding to the "revision" |
| * rule defined in ANTLR grammar file for corresponding ABNF rule in RFC 6020. |
| */ |
| public final class RevisionListener { |
| |
| /** |
| * Creates a new revision listener. |
| */ |
| private RevisionListener() { |
| } |
| |
| public static void processRevisionEntry(TreeWalkListener listener, |
| GeneratedYangParser.RevisionStatementContext ctx) { |
| |
| // Check for stack to be non empty. |
| ListenerValidation.checkStackIsNotEmpty(listener, ListenerErrorType.MISSING_HOLDER, |
| ParsableDataType.REVISION_DATA, |
| String.valueOf(ctx.DATE_ARG().getText()), |
| ListenerErrorLocation.ENTRY); |
| |
| // Validate for reverse chronological order of revision & for revision value. |
| if (!validateRevision(listener, ctx)) { |
| return; |
| // TODO to be implemented. |
| } |
| |
| YangRevision revisionNode = new YangRevision(); |
| revisionNode.setRevDate(String.valueOf(ctx.DATE_ARG().getText())); |
| |
| listener.getParsedDataStack().push(revisionNode); |
| } |
| |
| /** |
| * It is called when parser exits from grammar rule (revision), it perform |
| * validations and update the data model tree. |
| * |
| * @param listener Listener's object. |
| * @param ctx context object of the grammar rule. |
| */ |
| public static void processRevisionExit(TreeWalkListener listener, |
| GeneratedYangParser.RevisionStatementContext ctx) { |
| |
| // Check for stack to be non empty. |
| ListenerValidation |
| .checkStackIsNotEmpty(listener, ListenerErrorType.MISSING_HOLDER, ParsableDataType.REVISION_DATA, |
| String.valueOf(ctx.DATE_ARG().getText()), ListenerErrorLocation.EXIT); |
| |
| Parsable tmpRevisionNode = listener.getParsedDataStack().peek(); |
| if (tmpRevisionNode instanceof YangRevision) { |
| listener.getParsedDataStack().pop(); |
| |
| // Check for stack to be non empty. |
| ListenerValidation.checkStackIsNotEmpty(listener, ListenerErrorType.MISSING_HOLDER, |
| ParsableDataType.REVISION_DATA, |
| String.valueOf(ctx.DATE_ARG().getText()), |
| ListenerErrorLocation.EXIT); |
| |
| Parsable tmpNode = listener.getParsedDataStack().peek(); |
| switch (tmpNode.getParsableDataType()) { |
| case MODULE_DATA: { |
| YangModule module = (YangModule) tmpNode; |
| module.setRevision((YangRevision) tmpRevisionNode); |
| break; |
| } |
| case SUB_MODULE_DATA: { |
| YangSubModule subModule = (YangSubModule) tmpNode; |
| subModule.setRevision((YangRevision) tmpRevisionNode); |
| break; |
| } |
| default: |
| throw new ParserException( |
| ListenerErrorMessageConstruction |
| .constructListenerErrorMessage(ListenerErrorType.INVALID_HOLDER, |
| ParsableDataType.REVISION_DATA, |
| String.valueOf(ctx.DATE_ARG() |
| .getText()), |
| ListenerErrorLocation.EXIT)); |
| } |
| } else { |
| throw new ParserException( |
| ListenerErrorMessageConstruction |
| .constructListenerErrorMessage(ListenerErrorType.MISSING_CURRENT_HOLDER, |
| ParsableDataType.REVISION_DATA, String |
| .valueOf(ctx.DATE_ARG() |
| .getText()), |
| ListenerErrorLocation.EXIT)); |
| } |
| } |
| |
| /** |
| * Validate revision. |
| * |
| * @param listener Listener's object. |
| * @param ctx context object of the grammar rule. |
| * @return validation result |
| */ |
| private static boolean validateRevision(TreeWalkListener listener, |
| GeneratedYangParser.RevisionStatementContext ctx) { |
| // TODO to be implemented |
| return true; |
| } |
| } |