1324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver/* 2324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * [The "BSD licence"] 3324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * Copyright (c) 2005-2008 Terence Parr 4324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * All rights reserved. 5324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * 6324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * Conversion to C#: 7324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * Copyright (c) 2008-2009 Sam Harwell, Pixel Mine, Inc. 8324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * All rights reserved. 9324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * 10324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * Redistribution and use in source and binary forms, with or without 11324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * modification, are permitted provided that the following conditions 12324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * are met: 13324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * 1. Redistributions of source code must retain the above copyright 14324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * notice, this list of conditions and the following disclaimer. 15324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * 2. Redistributions in binary form must reproduce the above copyright 16324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * notice, this list of conditions and the following disclaimer in the 17324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * documentation and/or other materials provided with the distribution. 18324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * 3. The name of the author may not be used to endorse or promote products 19324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * derived from this software without specific prior written permission. 20324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * 21324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 22324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 23324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 24324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 25324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 26324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 30324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver */ 32324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 33324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruvernamespace Antlr.Runtime.Tree 34324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver{ 35324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver using StringBuilder = System.Text.StringBuilder; 36324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 37324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver public class TreePatternLexer 38324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver { 39324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver public const int Begin = 1; 40324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver public const int End = 2; 41324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver public const int Id = 3; 42324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver public const int Arg = 4; 43324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver public const int Percent = 5; 44324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver public const int Colon = 6; 45324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver public const int Dot = 7; 46324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 47324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /** <summary>The tree pattern to lex like "(A B C)"</summary> */ 48324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver protected string pattern; 49324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 50324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /** <summary>Index into input string</summary> */ 51324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver protected int p = -1; 52324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 53324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /** <summary>Current char</summary> */ 54324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver protected int c; 55324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 56324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /** <summary>How long is the pattern in char?</summary> */ 57324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver protected int n; 58324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 59324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /** <summary>Set when token type is ID or ARG (name mimics Java's StreamTokenizer)</summary> */ 60324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver public StringBuilder sval = new StringBuilder(); 61324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 62324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver public bool error = false; 63324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 64324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver public TreePatternLexer( string pattern ) 65324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver { 66324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver this.pattern = pattern; 67324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver this.n = pattern.Length; 68324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver Consume(); 69324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver } 70324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 71324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver public virtual int NextToken() 72324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver { 73324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver sval.Length = 0; // reset, but reuse buffer 74324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver while ( c != CharStreamConstants.EndOfFile ) 75324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver { 76324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver if ( c == ' ' || c == '\n' || c == '\r' || c == '\t' ) 77324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver { 78324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver Consume(); 79324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver continue; 80324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver } 81324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver if ( ( c >= 'a' && c <= 'z' ) || ( c >= 'A' && c <= 'Z' ) || c == '_' ) 82324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver { 83324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver sval.Append( (char)c ); 84324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver Consume(); 85324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver while ( ( c >= 'a' && c <= 'z' ) || ( c >= 'A' && c <= 'Z' ) || 86324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver ( c >= '0' && c <= '9' ) || c == '_' ) 87324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver { 88324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver sval.Append( (char)c ); 89324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver Consume(); 90324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver } 91324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver return Id; 92324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver } 93324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver if ( c == '(' ) 94324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver { 95324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver Consume(); 96324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver return Begin; 97324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver } 98324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver if ( c == ')' ) 99324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver { 100324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver Consume(); 101324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver return End; 102324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver } 103324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver if ( c == '%' ) 104324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver { 105324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver Consume(); 106324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver return Percent; 107324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver } 108324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver if ( c == ':' ) 109324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver { 110324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver Consume(); 111324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver return Colon; 112324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver } 113324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver if ( c == '.' ) 114324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver { 115324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver Consume(); 116324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver return Dot; 117324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver } 118324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver if ( c == '[' ) 119324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver { 120324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver // grab [x] as a string, returning x 121324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver Consume(); 122324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver while ( c != ']' ) 123324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver { 124324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver if ( c == '\\' ) 125324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver { 126324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver Consume(); 127324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver if ( c != ']' ) 128324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver { 129324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver sval.Append( '\\' ); 130324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver } 131324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver sval.Append( (char)c ); 132324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver } 133324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver else 134324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver { 135324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver sval.Append( (char)c ); 136324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver } 137324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver Consume(); 138324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver } 139324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver Consume(); 140324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver return Arg; 141324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver } 142324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver Consume(); 143324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver error = true; 144324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver return CharStreamConstants.EndOfFile; 145324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver } 146324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver return CharStreamConstants.EndOfFile; 147324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver } 148324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 149324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver protected virtual void Consume() 150324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver { 151324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver p++; 152324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver if ( p >= n ) 153324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver { 154324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver c = CharStreamConstants.EndOfFile; 155324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver } 156324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver else 157324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver { 158324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver c = pattern[p]; 159324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver } 160324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver } 161324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver } 162324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver} 163