1f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project/* 2f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * Copyright (C) 2007 The Android Open Source Project 3f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * 4f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * Licensed under the Apache License, Version 2.0 (the "License"); 5f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * you may not use this file except in compliance with the License. 6f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * You may obtain a copy of the License at 7f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * 8f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * http://www.apache.org/licenses/LICENSE-2.0 9f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * 10f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * Unless required by applicable law or agreed to in writing, software 11f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * distributed under the License is distributed on an "AS IS" BASIS, 12f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * See the License for the specific language governing permissions and 14f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * limitations under the License. 15f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project */ 16f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 17f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Projectpackage com.android.dx.util; 18f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 19f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Projectimport java.io.FilterWriter; 20f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Projectimport java.io.IOException; 21f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Projectimport java.io.Writer; 22f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 23f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project/** 24f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * Writer that wraps another writer and passes width-limited and 25f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * optionally-prefixed output to its subordinate. When lines are 26f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * wrapped they are automatically indented based on the start of the 27f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * line. 28f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project */ 29f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Projectpublic final class IndentingWriter extends FilterWriter { 3099409883d9c4c0ffb49b070ce307bb33a9dfe9f1The Android Open Source Project /** {@code null-ok;} optional prefix for every line */ 31f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project private final String prefix; 32f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 3399409883d9c4c0ffb49b070ce307bb33a9dfe9f1The Android Open Source Project /** {@code > 0;} the maximum output width */ 34f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project private final int width; 35f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 3699409883d9c4c0ffb49b070ce307bb33a9dfe9f1The Android Open Source Project /** {@code > 0;} the maximum indent */ 37f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project private final int maxIndent; 38f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 3999409883d9c4c0ffb49b070ce307bb33a9dfe9f1The Android Open Source Project /** {@code >= 0;} current output column (zero-based) */ 40f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project private int column; 41f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 42f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project /** whether indent spaces are currently being collected */ 43f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project private boolean collectingIndent; 44f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 4599409883d9c4c0ffb49b070ce307bb33a9dfe9f1The Android Open Source Project /** {@code >= 0;} current indent amount */ 46f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project private int indent; 47f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 48f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project /** 49f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * Constructs an instance. 50de75089fb7216d19e9c22cce4dc62a49513477d3Carl Shapiro * 5199409883d9c4c0ffb49b070ce307bb33a9dfe9f1The Android Open Source Project * @param out {@code non-null;} writer to send final output to 5299409883d9c4c0ffb49b070ce307bb33a9dfe9f1The Android Open Source Project * @param width {@code >= 0;} the maximum output width (not including 5399409883d9c4c0ffb49b070ce307bb33a9dfe9f1The Android Open Source Project * {@code prefix}), or {@code 0} for no maximum 5499409883d9c4c0ffb49b070ce307bb33a9dfe9f1The Android Open Source Project * @param prefix {@code non-null;} the prefix for each line 55f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project */ 56f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project public IndentingWriter(Writer out, int width, String prefix) { 57f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project super(out); 58f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 59f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project if (out == null) { 60f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project throw new NullPointerException("out == null"); 61f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 62f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 63f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project if (width < 0) { 64f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project throw new IllegalArgumentException("width < 0"); 65f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 66f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 67f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project if (prefix == null) { 68f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project throw new NullPointerException("prefix == null"); 69f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 70f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 71f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project this.width = (width != 0) ? width : Integer.MAX_VALUE; 72f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project this.maxIndent = width >> 1; 73f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project this.prefix = (prefix.length() == 0) ? null : prefix; 74f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 75f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project bol(); 76f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 77f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 78f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project /** 79f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * Constructs a no-prefix instance. 80de75089fb7216d19e9c22cce4dc62a49513477d3Carl Shapiro * 8199409883d9c4c0ffb49b070ce307bb33a9dfe9f1The Android Open Source Project * @param out {@code non-null;} writer to send final output to 8299409883d9c4c0ffb49b070ce307bb33a9dfe9f1The Android Open Source Project * @param width {@code >= 0;} the maximum output width (not including 8399409883d9c4c0ffb49b070ce307bb33a9dfe9f1The Android Open Source Project * {@code prefix}), or {@code 0} for no maximum 84f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project */ 85f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project public IndentingWriter(Writer out, int width) { 86f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project this(out, width, ""); 87f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 88f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 89f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project /** {@inheritDoc} */ 90f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project @Override 91f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project public void write(int c) throws IOException { 92f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project synchronized (lock) { 93f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project if (collectingIndent) { 94f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project if (c == ' ') { 95f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project indent++; 96f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project if (indent >= maxIndent) { 97f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project indent = maxIndent; 98f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project collectingIndent = false; 99f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 100f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } else { 101f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project collectingIndent = false; 102f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 103f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 104f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 105f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project if ((column == width) && (c != '\n')) { 106f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project out.write('\n'); 107f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project column = 0; 108f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project /* 109f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * Note: No else, so this should fall through to the next 110f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * if statement. 111f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project */ 112f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 113f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 114f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project if (column == 0) { 115f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project if (prefix != null) { 116f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project out.write(prefix); 117f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 118f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 119f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project if (!collectingIndent) { 120f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project for (int i = 0; i < indent; i++) { 121f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project out.write(' '); 122f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 123f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project column = indent; 124f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 125f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 126f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 127f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project out.write(c); 128f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 129f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project if (c == '\n') { 130f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project bol(); 131f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } else { 132f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project column++; 133f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 134f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 135f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 136f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 137f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project /** {@inheritDoc} */ 138f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project @Override 139f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project public void write(char[] cbuf, int off, int len) throws IOException { 140f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project synchronized (lock) { 141f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project while (len > 0) { 142f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project write(cbuf[off]); 143f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project off++; 144f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project len--; 145f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 146f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 147f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 148f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 149f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project /** {@inheritDoc} */ 150f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project @Override 151f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project public void write(String str, int off, int len) throws IOException { 152f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project synchronized (lock) { 153f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project while (len > 0) { 154f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project write(str.charAt(off)); 155f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project off++; 156f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project len--; 157f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 158f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 159f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 160f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 161f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project /** 162f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * Indicates that output is at the beginning of a line. 163f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project */ 164f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project private void bol() { 165f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project column = 0; 166f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project collectingIndent = (maxIndent != 0); 167f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project indent = 0; 168f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 169f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project} 170