001package votorola.g.web.gwt; // Copyright 2012, Michael Allan. Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Votorola Software"), to deal in the Votorola Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicence, and/or sell copies of the Votorola Software, and to permit persons to whom the Votorola Software is furnished to do so, subject to the following conditions: The preceding copyright notice and this permission notice shall be included in all copies or substantial portions of the Votorola Software. THE VOTOROLA 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 VOTOROLA SOFTWARE OR THE USE OR OTHER DEALINGS IN THE VOTOROLA SOFTWARE. 002 003 004/** {@linkplain com.google.gwt.regexp.shared.RegExp RegExp} utilities. 005 */ 006public final class RegExpX 007{ 008 009 010 private RegExpX() {} 011 012 013 014 /** Appends the character to the string builder, preceded by any quoting necessary to 015 * convert it from a meta-character to a character literal. 016 */ 017 public static void appendQuoted( final StringBuilder b, final char ch ) 018 { 019 if( ch == '\\' 020 || ch == '.' 021 || ch == '*' 022 || ch == '+' 023 || ch == '?' 024 || ch == '=' 025 || ch == '!' 026 || ch == ':' 027 || ch == '|' 028 || ch == '(' || ch == ')' 029 || ch == '{' || ch == '}' 030 || ch == '$' 031 || ch == '^' 032 || ch == '[' || ch == ']' ) b.append( '\\' ); 033 b.append( ch ); 034 } 035 036 037 038 /** Translates all meta-characters in the string to literals by quoting where 039 * necessary and appends the result to the string builder. 040 */ 041 public static void appendQuoted( final StringBuilder b, final String s ) 042 { 043 appendQuoted( b, s, /*start*/0, /*end*/s.length() ); 044 } 045 046 047 048 /** Translates all meta-characters in the substring to literals by quoting where 049 * necessary and appends the result to the string builder. The substring is taken 050 * from s and extends from start to end-1. 051 * 052 * @param start the index of the first character of the substring (inclusive). 053 * @param end the index of the substring end (exclusive). 054 */ 055 public static void appendQuoted( final StringBuilder b, final String s, final int start, 056 final int end ) 057 { 058 for( int c = start; c < end; ++c ) appendQuoted( b, s.charAt( c )); 059 } 060 061 062}