| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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.apache.samza.sql.client.cli; |
| |
| import org.apache.samza.sql.client.impl.CliCommandType; |
| import org.apache.samza.sql.client.util.CliUtil; |
| import org.jline.reader.Highlighter; |
| import org.jline.reader.LineReader; |
| import org.jline.utils.AttributedString; |
| import org.jline.utils.AttributedStringBuilder; |
| import org.jline.utils.AttributedStyle; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| /** |
| * A primitive highlighter. |
| */ |
| public class CliHighlighter implements Highlighter { |
| private static final List<String> KEYWORDS; |
| |
| static { |
| KEYWORDS = CliCommandType.getAllCommands(); |
| KEYWORDS.add("FROM"); |
| KEYWORDS.add("WHERE"); |
| } |
| |
| private static List<String> splitWithSpace(String buffer) { |
| List<String> list = new ArrayList<String>(); |
| if (CliUtil.isNullOrEmpty(buffer)) |
| return list; |
| |
| boolean prevIsSpace = Character.isSpaceChar(buffer.charAt(0)); |
| int prevPos = 0; |
| for (int i = 1; i < buffer.length(); ++i) { |
| char c = buffer.charAt(i); |
| boolean isSpace = Character.isSpaceChar(c); |
| if (isSpace != prevIsSpace) { |
| list.add(buffer.substring(prevPos, i)); |
| prevPos = i; |
| prevIsSpace = isSpace; |
| } |
| } |
| list.add(buffer.substring(prevPos)); |
| return list; |
| } |
| |
| public AttributedString highlight(LineReader reader, String buffer) { |
| AttributedStringBuilder builder = new AttributedStringBuilder(); |
| List<String> tokens = splitWithSpace(buffer); |
| |
| for (String token : tokens) { |
| if (isKeyword(token)) { |
| builder.style(AttributedStyle.BOLD.foreground(AttributedStyle.YELLOW)) |
| .append(token); |
| } else { |
| builder.style(AttributedStyle.DEFAULT) |
| .append(token); |
| } |
| } |
| |
| return builder.toAttributedString(); |
| } |
| |
| private boolean isKeyword(String token) { |
| for (String keyword : KEYWORDS) { |
| if (keyword.compareToIgnoreCase(token) == 0) |
| return true; |
| } |
| return false; |
| |
| } |
| } |