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https://github.com/marcin-szczepanski/jFuzzyLogic.git
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48 lines
1.9 KiB
Java
48 lines
1.9 KiB
Java
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package org.antlr.codegen;
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import java.util.*;
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public class JavaScriptTarget extends Target {
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/** Convert an int to a JavaScript Unicode character literal.
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*
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* The current JavaScript spec (ECMA-262) doesn't provide for octal
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* notation in String literals, although some implementations support it.
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* This method overrides the parent class so that characters will always
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* be encoded as Unicode literals (e.g. \u0011).
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*/
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public String encodeIntAsCharEscape(int v) {
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String hex = Integer.toHexString(v|0x10000).substring(1,5);
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return "\\u"+hex;
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}
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/** Convert long to two 32-bit numbers separted by a comma.
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* JavaScript does not support 64-bit numbers, so we need to break
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* the number into two 32-bit literals to give to the Bit. A number like
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* 0xHHHHHHHHLLLLLLLL is broken into the following string:
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* "0xLLLLLLLL, 0xHHHHHHHH"
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* Note that the low order bits are first, followed by the high order bits.
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* This is to match how the BitSet constructor works, where the bits are
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* passed in in 32-bit chunks with low-order bits coming first.
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*
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* Note: stole the following two methods from the ActionScript target.
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*/
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public String getTarget64BitStringFromValue(long word) {
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StringBuffer buf = new StringBuffer(22); // enough for the two "0x", "," and " "
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buf.append("0x");
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writeHexWithPadding(buf, Integer.toHexString((int)(word & 0x00000000ffffffffL)));
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buf.append(", 0x");
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writeHexWithPadding(buf, Integer.toHexString((int)(word >> 32)));
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return buf.toString();
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}
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private void writeHexWithPadding(StringBuffer buf, String digits) {
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digits = digits.toUpperCase();
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int padding = 8 - digits.length();
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// pad left with zeros
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for (int i=1; i<=padding; i++) {
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buf.append('0');
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}
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buf.append(digits);
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}
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}
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