1 /* 2 * Permission is hereby granted, free of charge, to any person obtaining a copy of 3 * this software and associated documentation files (the "Software"), to deal in 4 * the Software without restriction, including without limitation the rights to 5 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies 6 * of the Software, and to permit persons to whom the Software is furnished to do 7 * so, subject to the following conditions: 8 * 9 * The above copyright notice and this permission notice shall be included in all 10 * copies or substantial portions of the Software. 11 * 12 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 13 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 14 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 15 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 16 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 17 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 18 * SOFTWARE. 19 */ 20 package jdk.nashorn.internal.runtime.regexp.joni; 21 22 import static jdk.nashorn.internal.runtime.regexp.joni.BitStatus.bsClear; 23 24 import jdk.nashorn.internal.runtime.regexp.joni.ast.Node; 25 import jdk.nashorn.internal.runtime.regexp.joni.exception.ErrorMessages; 26 import jdk.nashorn.internal.runtime.regexp.joni.exception.InternalException; 27 28 public final class ScanEnvironment { 29 30 private static final int SCANENV_MEMNODES_SIZE = 8; 31 32 int option; 33 final int caseFoldFlag; 34 final public Syntax syntax; 35 int captureHistory; 36 int btMemStart; 37 int btMemEnd; 38 int backrefedMem; 39 40 final public Regex reg; 41 42 int numCall; 43 UnsetAddrList unsetAddrList; // USE_SUBEXP_CALL 44 public int numMem; 45 46 int numNamed; // USE_NAMED_GROUP 47 48 public Node memNodes[]; 49 50 // USE_COMBINATION_EXPLOSION_CHECK 51 int numCombExpCheck; 52 int combExpMaxRegNum; 53 int currMaxRegNum; 54 boolean hasRecursion; 55 56 public ScanEnvironment(Regex regex, Syntax syntax) { 57 this.reg = regex; 58 option = regex.options; 59 caseFoldFlag = regex.caseFoldFlag; 60 this.syntax = syntax; 61 } 62 63 public void clear() { 64 captureHistory = bsClear(); 65 btMemStart = bsClear(); 66 btMemEnd = bsClear(); 67 backrefedMem = bsClear(); 68 69 numCall = 0; 70 numMem = 0; 71 72 numNamed = 0; 73 74 memNodes = null; 75 76 numCombExpCheck = 0; 77 combExpMaxRegNum = 0; 78 currMaxRegNum = 0; 79 hasRecursion = false; 80 } 81 82 public int addMemEntry() { 83 if (numMem++ == 0) { 84 memNodes = new Node[SCANENV_MEMNODES_SIZE]; 85 } else if (numMem >= memNodes.length) { 86 Node[]tmp = new Node[memNodes.length << 1]; 87 System.arraycopy(memNodes, 0, tmp, 0, memNodes.length); 88 memNodes = tmp; 89 } 90 91 return numMem; 92 } 93 94 public void setMemNode(int num, Node node) { 95 if (numMem >= num) { 96 memNodes[num] = node; 97 } else { 98 throw new InternalException(ErrorMessages.ERR_PARSER_BUG); 99 } 100 } 101 102 public int convertBackslashValue(int c) { 103 if (syntax.opEscControlChars()) { 104 switch (c) { 105 case 'n': return '\n'; 106 case 't': return '\t'; 107 case 'r': return '\r'; 108 case 'f': return '\f'; 109 case 'a': return '\007'; 110 case 'b': return '\010'; 111 case 'e': return '\033'; 112 case 'v': 113 if (syntax.op2EscVVtab()) return 11; // ??? 114 break; 115 default: 116 break; 117 } 118 } 119 return c; 120 } 121 122 void ccEscWarn(String s) { 123 if (Config.USE_WARN) { 124 if (syntax.warnCCOpNotEscaped() && syntax.backSlashEscapeInCC()) { 125 reg.warnings.warn("character class has '" + s + "' without escape"); 126 } 127 } 128 } 129 130 void closeBracketWithoutEscapeWarn(String s) { 131 if (Config.USE_WARN) { 132 if (syntax.warnCCOpNotEscaped()) { 133 reg.warnings.warn("regular expression has '" + s + "' without escape"); 134 } 135 } 136 } 137 }