[120] | 1 | /** |
---|
| 2 | * Licensed to the Apache Software Foundation (ASF) under one |
---|
| 3 | * or more contributor license agreements. See the NOTICE file |
---|
| 4 | * distributed with this work for additional information |
---|
| 5 | * regarding copyright ownership. The ASF licenses this file |
---|
| 6 | * to you under the Apache License, Version 2.0 (the |
---|
| 7 | * "License"); you may not use this file except in compliance |
---|
| 8 | * with the License. You may obtain a copy of the License at |
---|
| 9 | * |
---|
| 10 | * http://www.apache.org/licenses/LICENSE-2.0 |
---|
| 11 | * |
---|
| 12 | * Unless required by applicable law or agreed to in writing, software |
---|
| 13 | * distributed under the License is distributed on an "AS IS" BASIS, |
---|
| 14 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
---|
| 15 | * See the License for the specific language governing permissions and |
---|
| 16 | * limitations under the License. |
---|
| 17 | */ |
---|
| 18 | package org.apache.hadoop.record.compiler; |
---|
| 19 | |
---|
| 20 | import java.util.ArrayList; |
---|
| 21 | |
---|
| 22 | /** |
---|
| 23 | * A wrapper around StringBuffer that automatically does indentation |
---|
| 24 | */ |
---|
| 25 | public class CodeBuffer { |
---|
| 26 | |
---|
| 27 | static private ArrayList<Character> startMarkers = new ArrayList<Character>(); |
---|
| 28 | static private ArrayList<Character> endMarkers = new ArrayList<Character>(); |
---|
| 29 | |
---|
| 30 | static { |
---|
| 31 | addMarkers('{', '}'); |
---|
| 32 | addMarkers('(', ')'); |
---|
| 33 | } |
---|
| 34 | |
---|
| 35 | static void addMarkers(char ch1, char ch2) { |
---|
| 36 | startMarkers.add(ch1); |
---|
| 37 | endMarkers.add(ch2); |
---|
| 38 | } |
---|
| 39 | |
---|
| 40 | private int level = 0; |
---|
| 41 | private int numSpaces = 2; |
---|
| 42 | private boolean firstChar = true; |
---|
| 43 | private StringBuffer sb; |
---|
| 44 | |
---|
| 45 | /** Creates a new instance of CodeBuffer */ |
---|
| 46 | CodeBuffer() { |
---|
| 47 | this(2, ""); |
---|
| 48 | } |
---|
| 49 | |
---|
| 50 | CodeBuffer(String s) { |
---|
| 51 | this(2, s); |
---|
| 52 | } |
---|
| 53 | |
---|
| 54 | CodeBuffer(int numSpaces, String s) { |
---|
| 55 | sb = new StringBuffer(); |
---|
| 56 | this.numSpaces = numSpaces; |
---|
| 57 | this.append(s); |
---|
| 58 | } |
---|
| 59 | |
---|
| 60 | void append(String s) { |
---|
| 61 | int length = s.length(); |
---|
| 62 | for (int idx = 0; idx < length; idx++) { |
---|
| 63 | char ch = s.charAt(idx); |
---|
| 64 | append(ch); |
---|
| 65 | } |
---|
| 66 | } |
---|
| 67 | |
---|
| 68 | void append(char ch) { |
---|
| 69 | if (endMarkers.contains(ch)) { |
---|
| 70 | level--; |
---|
| 71 | } |
---|
| 72 | if (firstChar) { |
---|
| 73 | for (int idx = 0; idx < level; idx++) { |
---|
| 74 | for (int num = 0; num < numSpaces; num++) { |
---|
| 75 | rawAppend(' '); |
---|
| 76 | } |
---|
| 77 | } |
---|
| 78 | } |
---|
| 79 | rawAppend(ch); |
---|
| 80 | firstChar = false; |
---|
| 81 | if (startMarkers.contains(ch)) { |
---|
| 82 | level++; |
---|
| 83 | } |
---|
| 84 | if (ch == '\n') { |
---|
| 85 | firstChar = true; |
---|
| 86 | } |
---|
| 87 | } |
---|
| 88 | |
---|
| 89 | private void rawAppend(char ch) { |
---|
| 90 | sb.append(ch); |
---|
| 91 | } |
---|
| 92 | |
---|
| 93 | public String toString() { |
---|
| 94 | return sb.toString(); |
---|
| 95 | } |
---|
| 96 | } |
---|