1324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver/* 2324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * [The "BSD license"] 3324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * Copyright (c) 2010 Terence Parr 4324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * All rights reserved. 5324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * 6324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * Redistribution and use in source and binary forms, with or without 7324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * modification, are permitted provided that the following conditions 8324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * are met: 9324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * 1. Redistributions of source code must retain the above copyright 10324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * notice, this list of conditions and the following disclaimer. 11324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * 2. Redistributions in binary form must reproduce the above copyright 12324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * notice, this list of conditions and the following disclaimer in the 13324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * documentation and/or other materials provided with the distribution. 14324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * 3. The name of the author may not be used to endorse or promote products 15324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * derived from this software without specific prior written permission. 16324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * 17324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver */ 28324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 29324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruverpackage org.antlr.codegen; 30324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 31324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruverpublic class JavaScriptTarget extends Target { 32324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /** Convert an int to a JavaScript Unicode character literal. 33324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * 34324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * The current JavaScript spec (ECMA-262) doesn't provide for octal 35324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * notation in String literals, although some implementations support it. 36324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * This method overrides the parent class so that characters will always 37324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * be encoded as Unicode literals (e.g. \u0011). 38324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver */ 39324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver public String encodeIntAsCharEscape(int v) { 40324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver String hex = Integer.toHexString(v|0x10000).substring(1,5); 41324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver return "\\u"+hex; 42324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver } 43324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 44324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /** Convert long to two 32-bit numbers separted by a comma. 45324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * JavaScript does not support 64-bit numbers, so we need to break 46324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * the number into two 32-bit literals to give to the Bit. A number like 47324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * 0xHHHHHHHHLLLLLLLL is broken into the following string: 48324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * "0xLLLLLLLL, 0xHHHHHHHH" 49324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * Note that the low order bits are first, followed by the high order bits. 50324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * This is to match how the BitSet constructor works, where the bits are 51324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * passed in in 32-bit chunks with low-order bits coming first. 52324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * 53324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * Note: stole the following two methods from the ActionScript target. 54324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver */ 55324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver public String getTarget64BitStringFromValue(long word) { 56324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver StringBuffer buf = new StringBuffer(22); // enough for the two "0x", "," and " " 57324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver buf.append("0x"); 58324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver writeHexWithPadding(buf, Integer.toHexString((int)(word & 0x00000000ffffffffL))); 59324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver buf.append(", 0x"); 60324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver writeHexWithPadding(buf, Integer.toHexString((int)(word >> 32))); 61324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 62324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver return buf.toString(); 63324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver } 64324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 65324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver private void writeHexWithPadding(StringBuffer buf, String digits) { 66324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver digits = digits.toUpperCase(); 67324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver int padding = 8 - digits.length(); 68324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver // pad left with zeros 69324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver for (int i=1; i<=padding; i++) { 70324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver buf.append('0'); 71324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver } 72324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver buf.append(digits); 73324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver } 74324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver} 75