696 lines
20 KiB
Java
696 lines
20 KiB
Java
/* The following code was generated by JFlex 1.6.1 */
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/* **********************************************
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* Duale Hochschule Baden-Württemberg Karlsruhe
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* Prof. Dr. Jörn Eisenbiegler
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*
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* Vorlesung Übersetzerbau
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* Praxis AS-Scanner mit JFlex 4
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*
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* **********************************************
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*/
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package de.dhbw.compiler.jflexasscanner;
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/**
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* This class is a scanner generated by
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* <a href="http://www.jflex.de/">JFlex</a> 1.6.1
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* from the specification file <tt>C:/Development/Schule/Java/ÜB-Praxis-JFlex Scanner für AS-Leer/src/de/dhbw/compiler/jflexasscanner/JFlexASScanner.flex</tt>
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*/
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public final class JFlexASScanner {
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/** This character denotes the end of file */
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public static final int YYEOF = -1;
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/** initial size of the lookahead buffer */
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private static final int ZZ_BUFFERSIZE = 16384;
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/** lexical states */
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public static final int YYINITIAL = 0;
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public static final int FRAC = 2;
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public static final int EXP = 4;
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public static final int STR = 6;
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public static final int NULL = 8;
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public static final int NUM = 10;
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public static final int ID = 12;
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/**
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* ZZ_LEXSTATE[l] is the state in the DFA for the lexical state l
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* ZZ_LEXSTATE[l+1] is the state in the DFA for the lexical state l
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* at the beginning of a line
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* l is of the form l = 2*k, k a non negative integer
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*/
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private static final int ZZ_LEXSTATE[] = {
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0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 3, 3
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};
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/**
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* Translates characters to character classes
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*/
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private static final String ZZ_CMAP_PACKED =
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"\10\0\3\1\2\0\1\1\22\0\1\1\13\0\1\11\3\0\12\3"+
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"\7\0\32\2\1\7\1\0\1\10\3\0\13\2\1\6\1\2\1\4"+
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"\6\2\1\5\5\2\uffff\0\uffff\0\uffff\0\uffff\0\uffff\0\uffff\0\uffff\0\uffff\0\uffff\0\uffff\0\uffff\0\uffff\0\uffff\0\uffff\0\uffff\0\uffff\0\uff95\0";
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/**
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* Translates characters to character classes
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*/
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private static final char [] ZZ_CMAP = zzUnpackCMap(ZZ_CMAP_PACKED);
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/**
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* Translates DFA states to action switch labels.
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*/
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private static final int [] ZZ_ACTION = zzUnpackAction();
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private static final String ZZ_ACTION_PACKED_0 =
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"\4\0\1\1\1\2\1\3\1\4\1\3\1\5\1\6"+
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"\1\7\1\10\1\11\1\12\1\13\1\14\1\15\2\0"+
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"\1\16";
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private static int [] zzUnpackAction() {
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int [] result = new int[21];
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int offset = 0;
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offset = zzUnpackAction(ZZ_ACTION_PACKED_0, offset, result);
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return result;
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}
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private static int zzUnpackAction(String packed, int offset, int [] result) {
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int i = 0; /* index in packed string */
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int j = offset; /* index in unpacked array */
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int l = packed.length();
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while (i < l) {
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int count = packed.charAt(i++);
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int value = packed.charAt(i++);
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do result[j++] = value; while (--count > 0);
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}
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return j;
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}
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/**
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* Translates a state to a row index in the transition table
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*/
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private static final int [] ZZ_ROWMAP = zzUnpackRowMap();
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private static final String ZZ_ROWMAP_PACKED_0 =
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"\0\0\0\12\0\24\0\36\0\12\0\50\0\12\0\12"+
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"\0\62\0\12\0\12\0\12\0\12\0\12\0\12\0\12"+
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"\0\74\0\12\0\106\0\120\0\12";
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private static int [] zzUnpackRowMap() {
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int [] result = new int[21];
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int offset = 0;
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offset = zzUnpackRowMap(ZZ_ROWMAP_PACKED_0, offset, result);
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return result;
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}
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private static int zzUnpackRowMap(String packed, int offset, int [] result) {
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int i = 0; /* index in packed string */
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int j = offset; /* index in unpacked array */
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int l = packed.length();
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while (i < l) {
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int high = packed.charAt(i++) << 16;
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result[j++] = high | packed.charAt(i++);
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}
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return j;
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}
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/**
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* The transition table of the DFA
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*/
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private static final int [] ZZ_TRANS = zzUnpackTrans();
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private static final String ZZ_TRANS_PACKED_0 =
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"\1\5\1\6\1\7\1\10\1\11\2\7\1\12\1\13"+
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"\1\14\12\0\2\15\1\16\1\17\3\16\3\15\1\20"+
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"\1\21\5\22\3\20\1\0\1\6\15\0\1\23\5\0"+
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"\1\21\16\0\1\24\11\0\1\25\3\0";
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private static int [] zzUnpackTrans() {
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int [] result = new int[90];
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int offset = 0;
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offset = zzUnpackTrans(ZZ_TRANS_PACKED_0, offset, result);
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return result;
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}
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private static int zzUnpackTrans(String packed, int offset, int [] result) {
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int i = 0; /* index in packed string */
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int j = offset; /* index in unpacked array */
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int l = packed.length();
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while (i < l) {
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int count = packed.charAt(i++);
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int value = packed.charAt(i++);
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value--;
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do result[j++] = value; while (--count > 0);
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}
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return j;
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}
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/* error codes */
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private static final int ZZ_UNKNOWN_ERROR = 0;
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private static final int ZZ_NO_MATCH = 1;
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private static final int ZZ_PUSHBACK_2BIG = 2;
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/* error messages for the codes above */
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private static final String ZZ_ERROR_MSG[] = {
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"Unknown internal scanner error",
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"Error: could not match input",
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"Error: pushback value was too large"
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};
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/**
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* ZZ_ATTRIBUTE[aState] contains the attributes of state <code>aState</code>
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*/
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private static final int [] ZZ_ATTRIBUTE = zzUnpackAttribute();
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private static final String ZZ_ATTRIBUTE_PACKED_0 =
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"\1\0\1\10\2\0\1\11\1\1\2\11\1\1\7\11"+
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"\1\1\1\11\2\0\1\11";
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private static int [] zzUnpackAttribute() {
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int [] result = new int[21];
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int offset = 0;
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offset = zzUnpackAttribute(ZZ_ATTRIBUTE_PACKED_0, offset, result);
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return result;
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}
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private static int zzUnpackAttribute(String packed, int offset, int [] result) {
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int i = 0; /* index in packed string */
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int j = offset; /* index in unpacked array */
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int l = packed.length();
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while (i < l) {
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int count = packed.charAt(i++);
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int value = packed.charAt(i++);
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do result[j++] = value; while (--count > 0);
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}
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return j;
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}
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/** the input device */
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private java.io.Reader zzReader;
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/** the current state of the DFA */
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private int zzState;
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/** the current lexical state */
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private int zzLexicalState = YYINITIAL;
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/** this buffer contains the current text to be matched and is
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the source of the yytext() string */
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private char zzBuffer[] = new char[ZZ_BUFFERSIZE];
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/** the textposition at the last accepting state */
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private int zzMarkedPos;
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/** the current text position in the buffer */
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private int zzCurrentPos;
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/** startRead marks the beginning of the yytext() string in the buffer */
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private int zzStartRead;
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/** endRead marks the last character in the buffer, that has been read
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from input */
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private int zzEndRead;
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/** number of newlines encountered up to the start of the matched text */
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private int yyline;
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/** the number of characters up to the start of the matched text */
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private int yychar;
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/**
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* the number of characters from the last newline up to the start of the
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* matched text
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*/
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private int yycolumn;
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/**
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* zzAtBOL == true <=> the scanner is currently at the beginning of a line
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*/
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private boolean zzAtBOL = true;
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/** zzAtEOF == true <=> the scanner is at the EOF */
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private boolean zzAtEOF;
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/** denotes if the user-EOF-code has already been executed */
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private boolean zzEOFDone;
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/**
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* The number of occupied positions in zzBuffer beyond zzEndRead.
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* When a lead/high surrogate has been read from the input stream
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* into the final zzBuffer position, this will have a value of 1;
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* otherwise, it will have a value of 0.
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*/
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private int zzFinalHighSurrogate = 0;
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/* user code: */
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int intValue = 0;
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String idValue = "";
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/**
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* Creates a new scanner
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*
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* @param in the java.io.Reader to read input from.
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*/
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public JFlexASScanner(java.io.Reader in) {
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this.zzReader = in;
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}
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/**
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* Unpacks the compressed character translation table.
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*
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* @param packed the packed character translation table
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* @return the unpacked character translation table
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*/
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private static char [] zzUnpackCMap(String packed) {
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char [] map = new char[0x110000];
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int i = 0; /* index in packed string */
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int j = 0; /* index in unpacked array */
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while (i < 80) {
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int count = packed.charAt(i++);
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char value = packed.charAt(i++);
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do map[j++] = value; while (--count > 0);
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}
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return map;
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}
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/**
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* Refills the input buffer.
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*
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* @return <code>false</code>, iff there was new input.
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*
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* @exception java.io.IOException if any I/O-Error occurs
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*/
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private boolean zzRefill() throws java.io.IOException {
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/* first: make room (if you can) */
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if (zzStartRead > 0) {
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zzEndRead += zzFinalHighSurrogate;
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zzFinalHighSurrogate = 0;
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System.arraycopy(zzBuffer, zzStartRead,
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zzBuffer, 0,
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zzEndRead-zzStartRead);
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/* translate stored positions */
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zzEndRead-= zzStartRead;
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zzCurrentPos-= zzStartRead;
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zzMarkedPos-= zzStartRead;
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zzStartRead = 0;
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}
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/* is the buffer big enough? */
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if (zzCurrentPos >= zzBuffer.length - zzFinalHighSurrogate) {
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/* if not: blow it up */
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char newBuffer[] = new char[zzBuffer.length*2];
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System.arraycopy(zzBuffer, 0, newBuffer, 0, zzBuffer.length);
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zzBuffer = newBuffer;
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zzEndRead += zzFinalHighSurrogate;
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zzFinalHighSurrogate = 0;
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}
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/* fill the buffer with new input */
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int requested = zzBuffer.length - zzEndRead;
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int numRead = zzReader.read(zzBuffer, zzEndRead, requested);
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/* not supposed to occur according to specification of java.io.Reader */
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if (numRead == 0) {
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throw new java.io.IOException("Reader returned 0 characters. See JFlex examples for workaround.");
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}
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if (numRead > 0) {
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zzEndRead += numRead;
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/* If numRead == requested, we might have requested to few chars to
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encode a full Unicode character. We assume that a Reader would
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otherwise never return half characters. */
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if (numRead == requested) {
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if (Character.isHighSurrogate(zzBuffer[zzEndRead - 1])) {
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--zzEndRead;
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zzFinalHighSurrogate = 1;
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}
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}
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/* potentially more input available */
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return false;
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}
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/* numRead < 0 ==> end of stream */
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return true;
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}
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/**
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* Closes the input stream.
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*/
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public final void yyclose() throws java.io.IOException {
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zzAtEOF = true; /* indicate end of file */
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zzEndRead = zzStartRead; /* invalidate buffer */
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if (zzReader != null)
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zzReader.close();
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}
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/**
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* Resets the scanner to read from a new input stream.
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* Does not close the old reader.
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*
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* All internal variables are reset, the old input stream
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* <b>cannot</b> be reused (internal buffer is discarded and lost).
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* Lexical state is set to <tt>ZZ_INITIAL</tt>.
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*
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* Internal scan buffer is resized down to its initial length, if it has grown.
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*
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* @param reader the new input stream
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*/
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public final void yyreset(java.io.Reader reader) {
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zzReader = reader;
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zzAtBOL = true;
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zzAtEOF = false;
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zzEOFDone = false;
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zzEndRead = zzStartRead = 0;
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zzCurrentPos = zzMarkedPos = 0;
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zzFinalHighSurrogate = 0;
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yyline = yychar = yycolumn = 0;
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zzLexicalState = YYINITIAL;
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if (zzBuffer.length > ZZ_BUFFERSIZE)
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zzBuffer = new char[ZZ_BUFFERSIZE];
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}
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/**
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* Returns the current lexical state.
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*/
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public final int yystate() {
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return zzLexicalState;
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}
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/**
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* Enters a new lexical state
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*
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* @param newState the new lexical state
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*/
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public final void yybegin(int newState) {
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zzLexicalState = newState;
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}
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/**
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* Returns the text matched by the current regular expression.
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*/
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public final String yytext() {
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return new String( zzBuffer, zzStartRead, zzMarkedPos-zzStartRead );
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}
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/**
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* Returns the character at position <tt>pos</tt> from the
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* matched text.
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*
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* It is equivalent to yytext().charAt(pos), but faster
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*
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* @param pos the position of the character to fetch.
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* A value from 0 to yylength()-1.
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*
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* @return the character at position pos
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*/
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public final char yycharat(int pos) {
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return zzBuffer[zzStartRead+pos];
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}
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/**
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* Returns the length of the matched text region.
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*/
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public final int yylength() {
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return zzMarkedPos-zzStartRead;
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}
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/**
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* Reports an error that occured while scanning.
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*
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* In a wellformed scanner (no or only correct usage of
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* yypushback(int) and a match-all fallback rule) this method
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* will only be called with things that "Can't Possibly Happen".
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* If this method is called, something is seriously wrong
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* (e.g. a JFlex bug producing a faulty scanner etc.).
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*
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* Usual syntax/scanner level error handling should be done
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* in error fallback rules.
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*
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* @param errorCode the code of the errormessage to display
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*/
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private void zzScanError(int errorCode) {
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String message;
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try {
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message = ZZ_ERROR_MSG[errorCode];
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}
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catch (ArrayIndexOutOfBoundsException e) {
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message = ZZ_ERROR_MSG[ZZ_UNKNOWN_ERROR];
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}
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throw new Error(message);
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}
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/**
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* Pushes the specified amount of characters back into the input stream.
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*
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* They will be read again by then next call of the scanning method
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*
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* @param number the number of characters to be read again.
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* This number must not be greater than yylength()!
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*/
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public void yypushback(int number) {
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if ( number > yylength() )
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zzScanError(ZZ_PUSHBACK_2BIG);
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zzMarkedPos -= number;
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}
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/**
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* Resumes scanning until the next regular expression is matched,
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* the end of input is encountered or an I/O-Error occurs.
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*
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* @return the next token
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* @exception java.io.IOException if any I/O-Error occurs
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*/
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public Token nextToken() throws java.io.IOException {
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int zzInput;
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int zzAction;
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// cached fields:
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int zzCurrentPosL;
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int zzMarkedPosL;
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int zzEndReadL = zzEndRead;
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char [] zzBufferL = zzBuffer;
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char [] zzCMapL = ZZ_CMAP;
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int [] zzTransL = ZZ_TRANS;
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int [] zzRowMapL = ZZ_ROWMAP;
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int [] zzAttrL = ZZ_ATTRIBUTE;
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while (true) {
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zzMarkedPosL = zzMarkedPos;
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boolean zzR = false;
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int zzCh;
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int zzCharCount;
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for (zzCurrentPosL = zzStartRead ;
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zzCurrentPosL < zzMarkedPosL ;
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zzCurrentPosL += zzCharCount ) {
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zzCh = Character.codePointAt(zzBufferL, zzCurrentPosL, zzMarkedPosL);
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zzCharCount = Character.charCount(zzCh);
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switch (zzCh) {
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case '\u000B':
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case '\u000C':
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case '\u0085':
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case '\u2028':
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case '\u2029':
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yyline++;
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yycolumn = 0;
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zzR = false;
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break;
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case '\r':
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yyline++;
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yycolumn = 0;
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zzR = true;
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break;
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case '\n':
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if (zzR)
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zzR = false;
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else {
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yyline++;
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yycolumn = 0;
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}
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|
break;
|
|
default:
|
|
zzR = false;
|
|
yycolumn += zzCharCount;
|
|
}
|
|
}
|
|
|
|
if (zzR) {
|
|
// peek one character ahead if it is \n (if we have counted one line too much)
|
|
boolean zzPeek;
|
|
if (zzMarkedPosL < zzEndReadL)
|
|
zzPeek = zzBufferL[zzMarkedPosL] == '\n';
|
|
else if (zzAtEOF)
|
|
zzPeek = false;
|
|
else {
|
|
boolean eof = zzRefill();
|
|
zzEndReadL = zzEndRead;
|
|
zzMarkedPosL = zzMarkedPos;
|
|
zzBufferL = zzBuffer;
|
|
if (eof)
|
|
zzPeek = false;
|
|
else
|
|
zzPeek = zzBufferL[zzMarkedPosL] == '\n';
|
|
}
|
|
if (zzPeek) yyline--;
|
|
}
|
|
zzAction = -1;
|
|
|
|
zzCurrentPosL = zzCurrentPos = zzStartRead = zzMarkedPosL;
|
|
|
|
zzState = ZZ_LEXSTATE[zzLexicalState];
|
|
|
|
// set up zzAction for empty match case:
|
|
int zzAttributes = zzAttrL[zzState];
|
|
if ( (zzAttributes & 1) == 1 ) {
|
|
zzAction = zzState;
|
|
}
|
|
|
|
|
|
zzForAction: {
|
|
while (true) {
|
|
|
|
if (zzCurrentPosL < zzEndReadL) {
|
|
zzInput = Character.codePointAt(zzBufferL, zzCurrentPosL, zzEndReadL);
|
|
zzCurrentPosL += Character.charCount(zzInput);
|
|
}
|
|
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 = Character.codePointAt(zzBufferL, zzCurrentPosL, zzEndReadL);
|
|
zzCurrentPosL += Character.charCount(zzInput);
|
|
}
|
|
}
|
|
int zzNext = zzTransL[ zzRowMapL[zzState] + zzCMapL[zzInput] ];
|
|
if (zzNext == -1) break zzForAction;
|
|
zzState = zzNext;
|
|
|
|
zzAttributes = zzAttrL[zzState];
|
|
if ( (zzAttributes & 1) == 1 ) {
|
|
zzAction = zzState;
|
|
zzMarkedPosL = zzCurrentPosL;
|
|
if ( (zzAttributes & 8) == 8 ) break zzForAction;
|
|
}
|
|
|
|
}
|
|
}
|
|
|
|
// store back cached position
|
|
zzMarkedPos = zzMarkedPosL;
|
|
|
|
if (zzInput == YYEOF && zzStartRead == zzCurrentPos) {
|
|
zzAtEOF = true;
|
|
{ return new Token(Token.EOF, "", yyline+1, yycolumn+1);
|
|
}
|
|
}
|
|
else {
|
|
switch (zzAction < 0 ? zzAction : ZZ_ACTION[zzAction]) {
|
|
case 1:
|
|
{ return new Token(Token.INVALID, yytext(), yyline+1, yycolumn+1);
|
|
/*throw new Error("Illegal character <" + yytext() + ">"); */
|
|
}
|
|
case 15: break;
|
|
case 2:
|
|
{ /* Ignore */
|
|
}
|
|
case 16: break;
|
|
case 3:
|
|
{ yybegin(ID);
|
|
idValue = yytext(); System.out.println("BEGIN ID <"+idValue+">");
|
|
}
|
|
case 17: break;
|
|
case 4:
|
|
{ yybegin(NUM);
|
|
intValue = yycharat(0)-'0';
|
|
}
|
|
case 18: break;
|
|
case 5:
|
|
{ return new Token(Token.LSBR, yytext(), yyline+1, yycolumn+1);
|
|
}
|
|
case 19: break;
|
|
case 6:
|
|
{ return new Token(Token.RSBR, yytext(), yyline+1, yycolumn+1);
|
|
}
|
|
case 20: break;
|
|
case 7:
|
|
{ return new Token(Token.COMMA, yytext(), yyline+1, yycolumn+1);
|
|
}
|
|
case 21: break;
|
|
case 8:
|
|
{ yybegin(YYINITIAL);
|
|
yypushback(1);
|
|
return new NumToken(String.valueOf(intValue), yyline+1, yycolumn+1);
|
|
}
|
|
case 22: break;
|
|
case 9:
|
|
{ yybegin(ID); idValue = String.valueOf(intValue); yypushback(1);
|
|
}
|
|
case 23: break;
|
|
case 10:
|
|
{ intValue = intValue * 10 + yycharat(0) - '0';
|
|
}
|
|
case 24: break;
|
|
case 11:
|
|
{ yybegin(YYINITIAL);System.out.println("PUSHBACK BEFORE <"+yytext()+">");
|
|
yypushback(1); System.out.println("PUSHBACK AFTER <"+yytext()+">"); System.out.println("LINE <"+yyline+"> / COLUMN <"+yycolumn+">");
|
|
return new Token(Token.ID, idValue, yyline+1, yycolumn);
|
|
}
|
|
case 25: break;
|
|
case 12:
|
|
{
|
|
}
|
|
case 26: break;
|
|
case 13:
|
|
{ idValue += yytext(); System.out.println("IN ID <"+idValue+">");
|
|
}
|
|
case 27: break;
|
|
case 14:
|
|
{ return new Token(Token.NULL, yytext(), yyline+1, yycolumn+1);
|
|
}
|
|
case 28: break;
|
|
default:
|
|
zzScanError(ZZ_NO_MATCH);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
}
|