Source Code Cross Referenced for FileBody.java in  » Scripting » rhino » org » mozilla » javascript » tools » idswitch » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Scripting » rhino » org.mozilla.javascript.tools.idswitch 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /* -*- Mode: java; tab-width: 4; indent-tabs-mode: 1; c-basic-offset: 4 -*-
002:         *
003:         * ***** BEGIN LICENSE BLOCK *****
004:         * Version: MPL 1.1/GPL 2.0
005:         *
006:         * The contents of this file are subject to the Mozilla Public License Version
007:         * 1.1 (the "License"); you may not use this file except in compliance with
008:         * the License. You may obtain a copy of the License at
009:         * http://www.mozilla.org/MPL/
010:         *
011:         * Software distributed under the License is distributed on an "AS IS" basis,
012:         * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
013:         * for the specific language governing rights and limitations under the
014:         * License.
015:         *
016:         * The Original Code is Rhino code, released
017:         * May 6, 1999.
018:         *
019:         * The Initial Developer of the Original Code is
020:         * Netscape Communications Corporation.
021:         * Portions created by the Initial Developer are Copyright (C) 1997-1999
022:         * the Initial Developer. All Rights Reserved.
023:         *
024:         * Contributor(s):
025:         *   Igor Bukanov
026:         *
027:         * Alternatively, the contents of this file may be used under the terms of
028:         * the GNU General Public License Version 2 or later (the "GPL"), in which
029:         * case the provisions of the GPL are applicable instead of those above. If
030:         * you wish to allow use of your version of this file only under the terms of
031:         * the GPL and not to allow others to use your version of this file under the
032:         * MPL, indicate your decision by deleting the provisions above and replacing
033:         * them with the notice and other provisions required by the GPL. If you do
034:         * not delete the provisions above, a recipient may use your version of this
035:         * file under either the MPL or the GPL.
036:         *
037:         * ***** END LICENSE BLOCK ***** */
038:        package org.mozilla.javascript.tools.idswitch;
039:
040:        import java.io.IOException;
041:        import java.io.Reader;
042:        import java.io.Writer;
043:
044:        public class FileBody {
045:
046:            private static class ReplaceItem {
047:                ReplaceItem next;
048:                int begin;
049:                int end;
050:                String replacement;
051:
052:                ReplaceItem(int begin, int end, String text) {
053:                    this .begin = begin;
054:                    this .end = end;
055:                    this .replacement = text;
056:                }
057:            }
058:
059:            private char[] buffer = new char[1 << 14]; // 16K
060:            private int bufferEnd;
061:            private int lineBegin;
062:            private int lineEnd;
063:            private int nextLineStart;
064:
065:            private int lineNumber;
066:
067:            ReplaceItem firstReplace;
068:            ReplaceItem lastReplace;
069:
070:            public char[] getBuffer() {
071:                return buffer;
072:            }
073:
074:            public void readData(Reader r) throws IOException {
075:                int capacity = buffer.length;
076:                int offset = 0;
077:                for (;;) {
078:                    int n_read = r.read(buffer, offset, capacity - offset);
079:                    if (n_read < 0) {
080:                        break;
081:                    }
082:                    offset += n_read;
083:                    if (capacity == offset) {
084:                        capacity *= 2;
085:                        char[] tmp = new char[capacity];
086:                        System.arraycopy(buffer, 0, tmp, 0, offset);
087:                        buffer = tmp;
088:                    }
089:                }
090:                bufferEnd = offset;
091:            }
092:
093:            public void writeInitialData(Writer w) throws IOException {
094:                w.write(buffer, 0, bufferEnd);
095:            }
096:
097:            public void writeData(Writer w) throws IOException {
098:                int offset = 0;
099:                for (ReplaceItem x = firstReplace; x != null; x = x.next) {
100:                    int before_replace = x.begin - offset;
101:                    if (before_replace > 0) {
102:                        w.write(buffer, offset, before_replace);
103:                    }
104:                    w.write(x.replacement);
105:                    offset = x.end;
106:                }
107:                int tail = bufferEnd - offset;
108:                if (tail != 0) {
109:                    w.write(buffer, offset, tail);
110:                }
111:            }
112:
113:            public boolean wasModified() {
114:                return firstReplace != null;
115:            }
116:
117:            public boolean setReplacement(int begin, int end, String text) {
118:                if (equals(text, buffer, begin, end)) {
119:                    return false;
120:                }
121:
122:                ReplaceItem item = new ReplaceItem(begin, end, text);
123:                if (firstReplace == null) {
124:                    firstReplace = lastReplace = item;
125:                } else if (begin < firstReplace.begin) {
126:                    item.next = firstReplace;
127:                    firstReplace = item;
128:                } else {
129:                    ReplaceItem cursor = firstReplace;
130:                    ReplaceItem next = cursor.next;
131:                    while (next != null) {
132:                        if (begin < next.begin) {
133:                            item.next = next;
134:                            cursor.next = item;
135:                            break;
136:                        }
137:                        cursor = next;
138:                        next = next.next;
139:                    }
140:                    if (next == null) {
141:                        lastReplace.next = item;
142:                    }
143:                }
144:
145:                return true;
146:            }
147:
148:            public int getLineNumber() {
149:                return lineNumber;
150:            }
151:
152:            public int getLineBegin() {
153:                return lineBegin;
154:            }
155:
156:            public int getLineEnd() {
157:                return lineEnd;
158:            }
159:
160:            public void startLineLoop() {
161:                lineNumber = 0;
162:                lineBegin = lineEnd = nextLineStart = 0;
163:            }
164:
165:            public boolean nextLine() {
166:                if (nextLineStart == bufferEnd) {
167:                    lineNumber = 0;
168:                    return false;
169:                }
170:                int i;
171:                int c = 0;
172:                for (i = nextLineStart; i != bufferEnd; ++i) {
173:                    c = buffer[i];
174:                    if (c == '\n' || c == '\r') {
175:                        break;
176:                    }
177:                }
178:                lineBegin = nextLineStart;
179:                lineEnd = i;
180:                if (i == bufferEnd) {
181:                    nextLineStart = i;
182:                } else if (c == '\r' && i + 1 != bufferEnd
183:                        && buffer[i + 1] == '\n') {
184:                    nextLineStart = i + 2;
185:                } else {
186:                    nextLineStart = i + 1;
187:                }
188:                ++lineNumber;
189:                return true;
190:            }
191:
192:            private static boolean equals(String str, char[] array, int begin,
193:                    int end) {
194:                if (str.length() == end - begin) {
195:                    for (int i = begin, j = 0; i != end; ++i, ++j) {
196:                        if (array[i] != str.charAt(j)) {
197:                            return false;
198:                        }
199:                    }
200:                    return true;
201:                }
202:                return false;
203:            }
204:
205:        }
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