| /* |
| * Permission is hereby granted, free of charge, to any person obtaining a copy of |
| * this software and associated documentation files (the "Software"), to deal in |
| * the Software without restriction, including without limitation the rights to |
| * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies |
| * of the Software, and to permit persons to whom the Software is furnished to do |
| * so, subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be included in all |
| * copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
| * SOFTWARE. |
| */ |
| package jdk.nashorn.internal.runtime.regexp.joni; |
| |
| import jdk.nashorn.internal.runtime.regexp.joni.encoding.IntHolder; |
| import jdk.nashorn.internal.runtime.regexp.joni.exception.ErrorMessages; |
| |
| abstract class ScannerSupport extends IntHolder implements ErrorMessages { |
| |
| protected final char[] chars; // pattern |
| protected int p; // current scanner position |
| protected int stop; // pattern end (mutable) |
| private int lastFetched; // last fetched value for unfetch support |
| protected int c; // current code point |
| |
| private final int begin; // pattern begin position for reset() support |
| private final int end; // pattern end position for reset() support |
| protected int _p; // used by mark()/restore() to mark positions |
| |
| private final static int INT_SIGN_BIT = 1 << 31; |
| |
| protected ScannerSupport(final char[] chars, final int p, final int end) { |
| this.chars = chars; |
| this.begin = p; |
| this.end = end; |
| |
| reset(); |
| } |
| |
| protected int getBegin() { |
| return begin; |
| } |
| |
| protected int getEnd() { |
| return end; |
| } |
| |
| protected final int scanUnsignedNumber() { |
| final int last = c; |
| int num = 0; // long ??? |
| while(left()) { |
| fetch(); |
| if (Character.isDigit(c)) { |
| final int onum = num; |
| num = num * 10 + EncodingHelper.digitVal(c); |
| if (((onum ^ num) & INT_SIGN_BIT) != 0) { |
| return -1; |
| } |
| } else { |
| unfetch(); |
| break; |
| } |
| } |
| c = last; |
| return num; |
| } |
| |
| protected final int scanUnsignedHexadecimalNumber(final int maxLength) { |
| final int last = c; |
| int num = 0; |
| int ml = maxLength; |
| while(left() && ml-- != 0) { |
| fetch(); |
| if (EncodingHelper.isXDigit(c)) { |
| final int onum = num; |
| final int val = EncodingHelper.xdigitVal(c); |
| num = (num << 4) + val; |
| if (((onum ^ num) & INT_SIGN_BIT) != 0) { |
| return -1; |
| } |
| } else { |
| unfetch(); |
| break; |
| } |
| } |
| c = last; |
| return num; |
| } |
| |
| protected final int scanUnsignedOctalNumber(final int maxLength) { |
| final int last = c; |
| int num = 0; |
| int ml = maxLength; |
| while(left() && ml-- != 0) { |
| fetch(); |
| if (Character.isDigit(c) && c < '8') { |
| final int onum = num; |
| final int val = EncodingHelper.odigitVal(c); |
| num = (num << 3) + val; |
| if (((onum ^ num) & INT_SIGN_BIT) != 0) { |
| return -1; |
| } |
| } else { |
| unfetch(); |
| break; |
| } |
| } |
| c = last; |
| return num; |
| } |
| |
| protected final void reset() { |
| p = begin; |
| stop = end; |
| } |
| |
| protected final void mark() { |
| _p = p; |
| } |
| |
| protected final void restore() { |
| p = _p; |
| } |
| |
| protected final void inc() { |
| lastFetched = p; |
| p++; |
| } |
| |
| protected final void fetch() { |
| lastFetched = p; |
| c = chars[p++]; |
| } |
| |
| protected int fetchTo() { |
| lastFetched = p; |
| return chars[p++]; |
| } |
| |
| protected final void unfetch() { |
| p = lastFetched; |
| } |
| |
| protected final int peek() { |
| return p < stop ? chars[p] : 0; |
| } |
| |
| protected final boolean peekIs(final int ch) { |
| return peek() == ch; |
| } |
| |
| protected final boolean left() { |
| return p < stop; |
| } |
| |
| } |