/* The following code was generated by JFlex 1.4.2 on 4/26/10 10:55 AM */
/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/*
* Scanner.java
* Copyright (C) 2008 University of Waikato, Hamilton, New Zealand
*/
package weka.core.mathematicalexpression;
import java_cup.runtime.SymbolFactory;
import java.io.*;
/**
* A scanner for mathematical expressions.
*
* @author FracPete (fracpete at waikato dot ac dot nz)
* @version $Revision: 6481 $
*/
public class Scanner implements java_cup.runtime.Scanner {
/** This character denotes the end of file */
public static final int YYEOF = -1;
/** initial size of the lookahead buffer */
private static final int ZZ_BUFFERSIZE = 16384;
/** lexical states */
public static final int YYINITIAL = 0;
/**
* ZZ_LEXSTATE[l] is the state in the DFA for the lexical state l
* ZZ_LEXSTATE[l+1] is the state in the DFA for the lexical state l
* at the beginning of a line
* l is of the form l = 2*k, k a non negative integer
*/
private static final int ZZ_LEXSTATE[] = {
0, 0
};
/**
* Translates characters to character classes
*/
private static final char [] ZZ_CMAP = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 32, 32, 0, 32, 32, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
32, 8, 0, 0, 0, 0, 9, 0, 34, 35, 3, 2, 33, 1, 30, 4,
29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 0, 0, 5, 6, 7, 0,
0, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31,
31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 0, 0, 0, 0, 0,
0, 16, 19, 27, 0, 14, 15, 22, 0, 25, 0, 0, 17, 0, 26, 21,
24, 20, 12, 18, 11, 13, 0, 28, 23, 0, 0, 0, 10, 0, 0, 0
};
/**
* Translates DFA states to action switch labels.
*/
private static final int [] ZZ_ACTION = zzUnpackAction();
private static final String ZZ_ACTION_PACKED_0 =
"\1\0\1\1\1\2\1\3\1\4\1\5\1\6\1\7"+
"\1\10\1\11\1\12\1\13\12\1\1\14\1\15\1\16"+
"\1\17\1\20\1\21\1\22\1\23\16\0\1\14\1\15"+
"\1\0\1\24\1\0\1\25\2\0\1\26\1\27\1\0"+
"\1\30\1\31\2\0\1\32\1\33\1\34\2\0\1\35"+
"\1\0\1\36\1\37\1\40\1\0\1\41";
private static int [] zzUnpackAction() {
int [] result = new int[71];
int offset = 0;
offset = zzUnpackAction(ZZ_ACTION_PACKED_0, offset, result);
return result;
}
private static int zzUnpackAction(String packed, int offset, int [] result) {
int i = 0; /* index in packed string */
int j = offset; /* index in unpacked array */
int l = packed.length();
while (i < l) {
int count = packed.charAt(i++);
int value = packed.charAt(i++);
do result[j++] = value; while (--count > 0);
}
return j;
}
/**
* Translates a state to a row index in the transition table
*/
private static final int [] ZZ_ROWMAP = zzUnpackRowMap();
private static final String ZZ_ROWMAP_PACKED_0 =
"\0\0\0\44\0\110\0\44\0\44\0\44\0\154\0\44"+
"\0\220\0\44\0\44\0\44\0\264\0\330\0\374\0\u0120"+
"\0\u0144\0\u0168\0\u018c\0\u01b0\0\u01d4\0\u01f8\0\u021c\0\u0240"+
"\0\44\0\44\0\44\0\44\0\44\0\44\0\u0264\0\u0288"+
"\0\u02ac\0\u02d0\0\u02f4\0\u0318\0\u033c\0\u0360\0\u0384\0\u03a8"+
"\0\u03cc\0\u03f0\0\u0414\0\u0438\0\u045c\0\u0480\0\u04a4\0\44"+
"\0\u04c8\0\44\0\u04ec\0\u0510\0\44\0\44\0\u0534\0\44"+
"\0\44\0\u0558\0\u057c\0\44\0\44\0\44\0\u05a0\0\u05c4"+
"\0\44\0\u05e8\0\44\0\44\0\44\0\u060c\0\44";
private static int [] zzUnpackRowMap() {
int [] result = new int[71];
int offset = 0;
offset = zzUnpackRowMap(ZZ_ROWMAP_PACKED_0, offset, result);
return result;
}
private static int zzUnpackRowMap(String packed, int offset, int [] result) {
int i = 0; /* index in packed string */
int j = offset; /* index in unpacked array */
int l = packed.length();
while (i < l) {
int high = packed.charAt(i++) << 16;
result[j++] = high | packed.charAt(i++);
}
return j;
}
/**
* The transition table of the DFA
*/
private static final int [] ZZ_TRANS = zzUnpackTrans();
private static final String ZZ_TRANS_PACKED_0 =
"\1\2\1\3\1\4\1\5\1\6\1\7\1\10\1\11"+
"\1\12\1\13\1\14\1\15\1\16\1\2\1\17\1\20"+
"\1\21\1\22\1\23\5\2\1\24\1\25\1\2\1\26"+
"\1\2\1\27\1\2\1\30\1\31\1\32\1\33\1\34"+
"\101\0\1\27\14\0\1\35\43\0\1\36\51\0\1\37"+
"\3\0\1\40\54\0\1\41\41\0\1\42\34\0\1\43"+
"\1\44\45\0\1\45\45\0\1\46\42\0\1\47\4\0"+
"\1\50\37\0\1\51\35\0\1\52\42\0\1\53\6\0"+
"\1\54\53\0\1\27\1\55\42\0\1\56\1\0\1\30"+
"\21\0\1\57\60\0\1\60\43\0\1\61\41\0\1\62"+
"\34\0\1\63\47\0\1\64\40\0\1\65\47\0\1\66"+
"\31\0\1\67\61\0\1\70\45\0\1\71\25\0\1\72"+
"\56\0\1\73\34\0\1\74\56\0\1\55\43\0\1\56"+
"\24\0\1\75\40\0\1\76\52\0\1\77\46\0\1\100"+
"\31\0\1\101\51\0\1\102\43\0\1\103\40\0\1\104"+
"\41\0\1\105\51\0\1\106\37\0\1\107\25\0";
private static int [] zzUnpackTrans() {
int [] result = new int[1584];
int offset = 0;
offset = zzUnpackTrans(ZZ_TRANS_PACKED_0, offset, result);
return result;
}
private static int zzUnpackTrans(String packed, int offset, int [] result) {
int i = 0; /* index in packed string */
int j = offset; /* index in unpacked array */
int l = packed.length();
while (i < l) {
int count = packed.charAt(i++);
int value = packed.charAt(i++);
value--;
do result[j++] = value; while (--count > 0);
}
return j;
}
/* error codes */
private static final int ZZ_UNKNOWN_ERROR = 0;
private static final int ZZ_NO_MATCH = 1;
private static final int ZZ_PUSHBACK_2BIG = 2;
/* error messages for the codes above */
private static final String ZZ_ERROR_MSG[] = {
"Unkown internal scanner error",
"Error: could not match input",
"Error: pushback value was too large"
};
/**
* ZZ_ATTRIBUTE[aState] contains the attributes of state <code>aState</code>
*/
private static final int [] ZZ_ATTRIBUTE = zzUnpackAttribute();
private static final String ZZ_ATTRIBUTE_PACKED_0 =
"\1\0\1\11\1\1\3\11\1\1\1\11\1\1\3\11"+
"\14\1\6\11\16\0\2\1\1\0\1\11\1\0\1\11"+
"\2\0\2\11\1\0\2\11\2\0\3\11\2\0\1\11"+
"\1\0\3\11\1\0\1\11";
private static int [] zzUnpackAttribute() {
int [] result = new int[71];
int offset = 0;
offset = zzUnpackAttribute(ZZ_ATTRIBUTE_PACKED_0, offset, result);
return result;
}
private static int zzUnpackAttribute(String packed, int offset, int [] result) {
int i = 0; /* index in packed string */
int j = offset; /* index in unpacked array */
int l = packed.length();
while (i < l) {
int count = packed.charAt(i++);
int value = packed.charAt(i++);
do result[j++] = value; while (--count > 0);
}
return j;
}
/** the input device */
private java.io.Reader zzReader;
/** the current state of the DFA */
private int zzState;
/** the current lexical state */
private int zzLexicalState = YYINITIAL;
/** this buffer contains the current text to be matched and is
the source of the yytext() string */
private char zzBuffer[] = new char[ZZ_BUFFERSIZE];
/** the textposition at the last accepting state */
private int zzMarkedPos;
/** the current text position in the buffer */
private int zzCurrentPos;
/** startRead marks the beginning of the yytext() string in the buffer */
private int zzStartRead;
/** endRead marks the last character in the buffer, that has been read
from input */
private int zzEndRead;
/** number of newlines encountered up to the start of the matched text */
private int yyline;
/** the number of characters up to the start of the matched text */
private int yychar;
/**
* the number of characters from the last newline up to the start of the
* matched text
*/
private int yycolumn;
/**
* zzAtBOL == true <=> the scanner is currently at the beginning of a line
*/
private boolean zzAtBOL = true;
/** zzAtEOF == true <=> the scanner is at the EOF */
private boolean zzAtEOF;
/* user code: */
// Author: FracPete (fracpete at waikato dot ac dot nz)
// Version: $Revision: 6481 $
protected SymbolFactory sf;
public Scanner(InputStream r, SymbolFactory sf){
this(r);
this.sf = sf;
}
/**
* Creates a new scanner
* There is also a java.io.InputStream version of this constructor.
*
* @param in the java.io.Reader to read input from.
*/
public Scanner(java.io.Reader in) {
this.zzReader = in;
}
/**
* Creates a new scanner.
* There is also java.io.Reader version of this constructor.
*
* @param in the java.io.Inputstream to read input from.
*/
public Scanner(java.io.InputStream in) {
this(new java.io.InputStreamReader(in));
}
/**
* Refills the input buffer.
*
* @return <code>false</code>, iff there was new input.
*
* @exception java.io.IOException if any I/O-Error occurs
*/
private boolean zzRefill() throws java.io.IOException {
/* first: make room (if you can) */
if (zzStartRead > 0) {
System.arraycopy(zzBuffer, zzStartRead,
zzBuffer, 0,
zzEndRead-zzStartRead);
/* translate stored positions */
zzEndRead-= zzStartRead;
zzCurrentPos-= zzStartRead;
zzMarkedPos-= zzStartRead;
zzStartRead = 0;
}
/* is the buffer big enough? */
if (zzCurrentPos >= zzBuffer.length) {
/* if not: blow it up */
char newBuffer[] = new char[zzCurrentPos*2];
System.arraycopy(zzBuffer, 0, newBuffer, 0, zzBuffer.length);
zzBuffer = newBuffer;
}
/* finally: fill the buffer with new input */
int numRead = zzReader.read(zzBuffer, zzEndRead,
zzBuffer.length-zzEndRead);
if (numRead > 0) {
zzEndRead+= numRead;
return false;
}
// unlikely but not impossible: read 0 characters, but not at end of stream
if (numRead == 0) {
int c = zzReader.read();
if (c == -1) {
return true;
} else {
zzBuffer[zzEndRead++] = (char) c;
return false;
}
}
// numRead < 0
return true;
}
/**
* Closes the input stream.
*/
public final void yyclose() throws java.io.IOException {
zzAtEOF = true; /* indicate end of file */
zzEndRead = zzStartRead; /* invalidate buffer */
if (zzReader != null)
zzReader.close();
}
/**
* Resets the scanner to read from a new input stream.
* Does not close the old reader.
*
* All internal variables are reset, the old input stream
* <b>cannot</b> be reused (internal buffer is discarded and lost).
* Lexical state is set to <tt>ZZ_INITIAL</tt>.
*
* @param reader the new input stream
*/
public final void yyreset(java.io.Reader reader) {
zzReader = reader;
zzAtBOL = true;
zzAtEOF = false;
zzEndRead = zzStartRead = 0;
zzCurrentPos = zzMarkedPos = 0;
yyline = yychar = yycolumn = 0;
zzLexicalState = YYINITIAL;
}
/**
* Returns the current lexical state.
*/
public final int yystate() {
return zzLexicalState;
}
/**
* Enters a new lexical state
*
* @param newState the new lexical state
*/
public final void yybegin(int newState) {
zzLexicalState = newState;
}
/**
* Returns the text matched by the current regular expression.
*/
public final String yytext() {
return new String( zzBuffer, zzStartRead, zzMarkedPos-zzStartRead );
}
/**
* Returns the character at position <tt>pos</tt> from the
* matched text.
*
* It is equivalent to yytext().charAt(pos), but faster
*
* @param pos the position of the character to fetch.
* A value from 0 to yylength()-1.
*
* @return the character at position pos
*/
public final char yycharat(int pos) {
return zzBuffer[zzStartRead+pos];
}
/**
* Returns the length of the matched text region.
*/
public final int yylength() {
return zzMarkedPos-zzStartRead;
}
/**
* Reports an error that occured while scanning.
*
* In a wellformed scanner (no or only correct usage of
* yypushback(int) and a match-all fallback rule) this method
* will only be called with things that "Can't Possibly Happen".
* If this method is called, something is seriously wrong
* (e.g. a JFlex bug producing a faulty scanner etc.).
*
* Usual syntax/scanner level error handling should be done
* in error fallback rules.
*
* @param errorCode the code of the errormessage to display
*/
private void zzScanError(int errorCode) {
String message;
try {
message = ZZ_ERROR_MSG[errorCode];
}
catch (ArrayIndexOutOfBoundsException e) {
message = ZZ_ERROR_MSG[ZZ_UNKNOWN_ERROR];
}
throw new Error(message);
}
/**
* Pushes the specified amount of characters back into the input stream.
*
* They will be read again by then next call of the scanning method
*
* @param number the number of characters to be read again.
* This number must not be greater than yylength()!
*/
public void yypushback(int number) {
if ( number > yylength() )
zzScanError(ZZ_PUSHBACK_2BIG);
zzMarkedPos -= number;
}
/**
* Resumes scanning until the next regular expression is matched,
* the end of input is encountered or an I/O-Error occurs.
*
* @return the next token
* @exception java.io.IOException if any I/O-Error occurs
*/
public java_cup.runtime.Symbol next_token() throws java.io.IOException {
int zzInput;
int zzAction;
// cached fields:
int zzCurrentPosL;
int zzMarkedPosL;
int zzEndReadL = zzEndRead;
char [] zzBufferL = zzBuffer;
char [] zzCMapL = ZZ_CMAP;
int [] zzTransL = ZZ_TRANS;
int [] zzRowMapL = ZZ_ROWMAP;
int [] zzAttrL = ZZ_ATTRIBUTE;
while (true) {
zzMarkedPosL = zzMarkedPos;
zzAction = -1;
zzCurrentPosL = zzCurrentPos = zzStartRead = zzMarkedPosL;
zzState = ZZ_LEXSTATE[zzLexicalState];
zzForAction: {
while (true) {
if (zzCurrentPosL < zzEndReadL)
zzInput = zzBufferL[zzCurrentPosL++];
else if (zzAtEOF) {
zzInput = YYEOF;
break zzForAction;
}
else {
// store back cached positions
zzCurrentPos = zzCurrentPosL;
zzMarkedPos = zzMarkedPosL;
boolean eof = zzRefill();
// get translated positions and possibly new buffer
zzCurrentPosL = zzCurrentPos;
zzMarkedPosL = zzMarkedPos;
zzBufferL = zzBuffer;
zzEndReadL = zzEndRead;
if (eof) {
zzInput = YYEOF;
break zzForAction;
}
else {
zzInput = zzBufferL[zzCurrentPosL++];
}
}
int zzNext = zzTransL[ zzRowMapL[zzState] + zzCMapL[zzInput] ];
if (zzNext == -1) break zzForAction;
zzState = zzNext;
int zzAttributes = zzAttrL[zzState];
if ( (zzAttributes & 1) == 1 ) {
zzAction = zzState;
zzMarkedPosL = zzCurrentPosL;
if ( (zzAttributes & 8) == 8 ) break zzForAction;
}
}
}
// store back cached position
zzMarkedPos = zzMarkedPosL;
switch (zzAction < 0 ? zzAction : ZZ_ACTION[zzAction]) {
case 11:
{ return sf.newSymbol("Or", sym.OR);
}
case 34: break;
case 24:
{ return sf.newSymbol("Sin", sym.SIN);
}
case 35: break;
case 23:
{ return sf.newSymbol("Log", sym.LOG);
}
case 36: break;
case 16:
{ return sf.newSymbol("Left Bracket", sym.LPAREN);
}
case 37: break;
case 27:
{ return sf.newSymbol("True", sym.TRUE);
}
case 38: break;
case 1:
{ System.err.println("Illegal character: "+yytext());
}
case 39: break;
case 29:
{ return sf.newSymbol("Sqrt", sym.SQRT);
}
case 40: break;
case 30:
{ return sf.newSymbol("Ceil", sym.CEIL);
}
case 41: break;
case 31:
{ return sf.newSymbol("False", sym.FALSE);
}
case 42: break;
case 18:
{ return sf.newSymbol("Less or equal than", sym.LE);
}
case 43: break;
case 17:
{ return sf.newSymbol("Right Bracket", sym.RPAREN);
}
case 44: break;
case 26:
{ return sf.newSymbol("Cos", sym.COS);
}
case 45: break;
case 21:
{ return sf.newSymbol("Exp", sym.EXP);
}
case 46: break;
case 12:
{ return sf.newSymbol("Number", sym.NUMBER, new Double(yytext()));
}
case 47: break;
case 3:
{ return sf.newSymbol("Plus", sym.PLUS);
}
case 48: break;
case 13:
{ return sf.newSymbol("Variable", sym.VARIABLE, new String(yytext()));
}
case 49: break;
case 22:
{ return sf.newSymbol("Abs", sym.ABS);
}
case 50: break;
case 20:
{ return sf.newSymbol("Tan", sym.TAN);
}
case 51: break;
case 15:
{ return sf.newSymbol("Comma", sym.COMMA);
}
case 52: break;
case 33:
{ return sf.newSymbol("IfElse", sym.IFELSE);
}
case 53: break;
case 28:
{ return sf.newSymbol("Rint", sym.RINT);
}
case 54: break;
case 8:
{ return sf.newSymbol("Greater than", sym.GT);
}
case 55: break;
case 19:
{ return sf.newSymbol("Greater or equal than", sym.GE);
}
case 56: break;
case 5:
{ return sf.newSymbol("Division", sym.DIVISION);
}
case 57: break;
case 7:
{ return sf.newSymbol("Equals", sym.EQ);
}
case 58: break;
case 10:
{ return sf.newSymbol("And", sym.AND);
}
case 59: break;
case 9:
{ return sf.newSymbol("Not", sym.NOT);
}
case 60: break;
case 4:
{ return sf.newSymbol("Times", sym.TIMES);
}
case 61: break;
case 32:
{ return sf.newSymbol("Floor", sym.FLOOR);
}
case 62: break;
case 6:
{ return sf.newSymbol("Less than", sym.LT);
}
case 63: break;
case 25:
{ return sf.newSymbol("Pow", sym.POW);
}
case 64: break;
case 14:
{ /* ignore white space. */
}
case 65: break;
case 2:
{ return sf.newSymbol("Minus", sym.MINUS);
}
case 66: break;
default:
if (zzInput == YYEOF && zzStartRead == zzCurrentPos) {
zzAtEOF = true;
{ return sf.newSymbol("EOF",sym.EOF);
}
}
else {
zzScanError(ZZ_NO_MATCH);
}
}
}
}
}