| /* |
| * [The "BSD license"] |
| * Copyright (c) 2010 Terence Parr |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 3. The name of the author may not be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| package org.antlr.codegen; |
| |
| public class JavaScriptTarget extends Target { |
| /** Convert an int to a JavaScript Unicode character literal. |
| * |
| * The current JavaScript spec (ECMA-262) doesn't provide for octal |
| * notation in String literals, although some implementations support it. |
| * This method overrides the parent class so that characters will always |
| * be encoded as Unicode literals (e.g. \u0011). |
| */ |
| public String encodeIntAsCharEscape(int v) { |
| String hex = Integer.toHexString(v|0x10000).substring(1,5); |
| return "\\u"+hex; |
| } |
| |
| /** Convert long to two 32-bit numbers separted by a comma. |
| * JavaScript does not support 64-bit numbers, so we need to break |
| * the number into two 32-bit literals to give to the Bit. A number like |
| * 0xHHHHHHHHLLLLLLLL is broken into the following string: |
| * "0xLLLLLLLL, 0xHHHHHHHH" |
| * Note that the low order bits are first, followed by the high order bits. |
| * This is to match how the BitSet constructor works, where the bits are |
| * passed in in 32-bit chunks with low-order bits coming first. |
| * |
| * Note: stole the following two methods from the ActionScript target. |
| */ |
| public String getTarget64BitStringFromValue(long word) { |
| StringBuffer buf = new StringBuffer(22); // enough for the two "0x", "," and " " |
| buf.append("0x"); |
| writeHexWithPadding(buf, Integer.toHexString((int)(word & 0x00000000ffffffffL))); |
| buf.append(", 0x"); |
| writeHexWithPadding(buf, Integer.toHexString((int)(word >> 32))); |
| |
| return buf.toString(); |
| } |
| |
| private void writeHexWithPadding(StringBuffer buf, String digits) { |
| digits = digits.toUpperCase(); |
| int padding = 8 - digits.length(); |
| // pad left with zeros |
| for (int i=1; i<=padding; i++) { |
| buf.append('0'); |
| } |
| buf.append(digits); |
| } |
| } |