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Humenius
2020-04-27 13:22:01 +02:00
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28
ÜB-Praxis-JFlex Scanner für AS-Leer/src/de/dhbw/compiler/jflexasscanner/FracToken.java Normal file
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/* **********************************************
* Duale Hochschule Baden-Württemberg Karlsruhe
* Prof. Dr. Jörn Eisenbiegler
*
* Vorlesung Übersetzerbau
* Praxis AS-Scanner mit JFlex
* - Token-Definition frac
*
* **********************************************
*/
package de.dhbw.compiler.jflexasscanner;
public class FracToken extends Token {
private double value;
public FracToken(int type, String text, int line, int column, double value) {
super(type,text,line,column);
this.value = value;
}
double getValue() {
return value;
}
}

54
ÜB-Praxis-JFlex Scanner für AS-Leer/src/de/dhbw/compiler/jflexasscanner/JFlexASScanner.flex Normal file
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/* **********************************************
* Duale Hochschule Baden-Württemberg Karlsruhe
* Prof. Dr. Jörn Eisenbiegler
*
* Vorlesung Übersetzerbau
* Praxis AS-Scanner mit JFlex 4
*
* **********************************************
*/
package de.dhbw.compiler.jflexasscanner;
%%
%class JFlexASScanner
%function nextToken
%type Token
%unicode
%line
%column
%public
%final
%xstate NUM, FRAC, EXP, STR, NULL
WhiteSpace = [ \t\b\r\n]+
SmallChars = [a-z]+
CapitalChars = [A-Z]+
Numbers = [0-9]+
AllChars = [a-zA-Z0-9]+
%{
%}
%eofval{
return new Token(Token.EOF, "", yyline+1, yycolumn+1);
%eofval}
%%
//[^] { return new Token(Token.INVALID, yytext(), yyline+1, yycolumn+1); }
"null" { return new Token(Token.NULL, yytext(), yyline+1, yycolumn+1); }
{Numbers} { return new Token(Token.NUM, yytext(), yyline+1, yycolumn+1); }
{AllChars} { return new Token(Token.ID, yytext(), yyline+1, yycolumn+1); }
[\[] { return new Token(Token.LSBR, yytext(), yyline+1, yycolumn+1); }
[\]] { return new Token(Token.RSBR, yytext(), yyline+1, yycolumn+1); }
[,] { return new Token(Token.COMMA, yytext(), yyline+1, yycolumn+1); }
{WhiteSpace} { /* Ignore */ }
[^] { return new Token(Token.INVALID, yytext(), yyline+1, yycolumn+1);
/*throw new Error("Illegal character <" + yytext() + ">"); */}

659
ÜB-Praxis-JFlex Scanner für AS-Leer/src/de/dhbw/compiler/jflexasscanner/JFlexASScanner.java Normal file
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/* The following code was generated by JFlex 1.6.1 */
/* **********************************************
* Duale Hochschule Baden-Württemberg Karlsruhe
* Prof. Dr. Jörn Eisenbiegler
*
* Vorlesung Übersetzerbau
* Praxis AS-Scanner mit JFlex 4
*
* **********************************************
*/
package de.dhbw.compiler.jflexasscanner;
/**
* This class is a scanner generated by
* <a href="http://www.jflex.de/">JFlex</a> 1.6.1
* from the specification file <tt>C:/Development/Schule/Java/ÜB-Praxis-JFlex Scanner für AS-Leer/src/de/dhbw/compiler/jflexasscanner/JFlexASScanner.flex</tt>
*/
public final class JFlexASScanner {
/** 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;
public static final int NUM = 2;
public static final int FRAC = 4;
public static final int EXP = 6;
public static final int STR = 8;
public static final int NULL = 10;
/**
* 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1
};
/**
* Translates characters to character classes
*/
private static final String ZZ_CMAP_PACKED =
"\10\0\3\1\2\0\1\1\22\0\1\1\13\0\1\11\3\0\12\3"+
"\7\0\32\2\1\7\1\0\1\10\3\0\13\2\1\6\1\2\1\4"+
"\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";
/**
* Translates characters to character classes
*/
private static final char [] ZZ_CMAP = zzUnpackCMap(ZZ_CMAP_PACKED);
/**
* Translates DFA states to action switch labels.
*/
private static final int [] ZZ_ACTION = zzUnpackAction();
private static final String ZZ_ACTION_PACKED_0 =
"\2\0\1\1\1\2\1\3\1\4\1\3\1\5\1\6"+
"\1\7\2\3\1\10";
private static int [] zzUnpackAction() {
int [] result = new int[13];
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\12\0\12\0\24\0\36\0\50\0\62\0\12"+
"\0\12\0\12\0\74\0\106\0\36";
private static int [] zzUnpackRowMap() {
int [] result = new int[13];
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\3\1\4\1\5\1\6\1\7\2\5\1\10\1\11"+
"\1\12\13\0\1\4\12\0\5\5\5\0\1\5\1\6"+
"\3\5\5\0\3\5\1\13\1\5\5\0\4\5\1\14"+
"\5\0\4\5\1\15\3\0";
private static int [] zzUnpackTrans() {
int [] result = new int[80];
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[] = {
"Unknown 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\10\1\11\4\1\3\11\3\1";
private static int [] zzUnpackAttribute() {
int [] result = new int[13];
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;
/** denotes if the user-EOF-code has already been executed */
private boolean zzEOFDone;
/**
* The number of occupied positions in zzBuffer beyond zzEndRead.
* When a lead/high surrogate has been read from the input stream
* into the final zzBuffer position, this will have a value of 1;
* otherwise, it will have a value of 0.
*/
private int zzFinalHighSurrogate = 0;
/* user code: */
/**
* Creates a new scanner
*
* @param in the java.io.Reader to read input from.
*/
public JFlexASScanner(java.io.Reader in) {
this.zzReader = in;
}
/**
* Unpacks the compressed character translation table.
*
* @param packed the packed character translation table
* @return the unpacked character translation table
*/
private static char [] zzUnpackCMap(String packed) {
char [] map = new char[0x110000];
int i = 0; /* index in packed string */
int j = 0; /* index in unpacked array */
while (i < 80) {
int count = packed.charAt(i++);
char value = packed.charAt(i++);
do map[j++] = value; while (--count > 0);
}
return map;
}
/**
* 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) {
zzEndRead += zzFinalHighSurrogate;
zzFinalHighSurrogate = 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 - zzFinalHighSurrogate) {
/* if not: blow it up */
char newBuffer[] = new char[zzBuffer.length*2];
System.arraycopy(zzBuffer, 0, newBuffer, 0, zzBuffer.length);
zzBuffer = newBuffer;
zzEndRead += zzFinalHighSurrogate;
zzFinalHighSurrogate = 0;
}
/* fill the buffer with new input */
int requested = zzBuffer.length - zzEndRead;
int numRead = zzReader.read(zzBuffer, zzEndRead, requested);
/* not supposed to occur according to specification of java.io.Reader */
if (numRead == 0) {
throw new java.io.IOException("Reader returned 0 characters. See JFlex examples for workaround.");
}
if (numRead > 0) {
zzEndRead += numRead;
/* If numRead == requested, we might have requested to few chars to
encode a full Unicode character. We assume that a Reader would
otherwise never return half characters. */
if (numRead == requested) {
if (Character.isHighSurrogate(zzBuffer[zzEndRead - 1])) {
--zzEndRead;
zzFinalHighSurrogate = 1;
}
}
/* potentially more input available */
return false;
}
/* numRead < 0 ==> end of stream */
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>.
*
* Internal scan buffer is resized down to its initial length, if it has grown.
*
* @param reader the new input stream
*/
public final void yyreset(java.io.Reader reader) {
zzReader = reader;
zzAtBOL = true;
zzAtEOF = false;
zzEOFDone = false;
zzEndRead = zzStartRead = 0;
zzCurrentPos = zzMarkedPos = 0;
zzFinalHighSurrogate = 0;
yyline = yychar = yycolumn = 0;
zzLexicalState = YYINITIAL;
if (zzBuffer.length > ZZ_BUFFERSIZE)
zzBuffer = new char[ZZ_BUFFERSIZE];
}
/**
* 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 Token nextToken() 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;
boolean zzR = false;
int zzCh;
int zzCharCount;
for (zzCurrentPosL = zzStartRead ;
zzCurrentPosL < zzMarkedPosL ;
zzCurrentPosL += zzCharCount ) {
zzCh = Character.codePointAt(zzBufferL, zzCurrentPosL, zzMarkedPosL);
zzCharCount = Character.charCount(zzCh);
switch (zzCh) {
case '\u000B':
case '\u000C':
case '\u0085':
case '\u2028':
case '\u2029':
yyline++;
yycolumn = 0;
zzR = false;
break;
case '\r':
yyline++;
yycolumn = 0;
zzR = true;
break;
case '\n':
if (zzR)
zzR = false;
else {
yyline++;
yycolumn = 0;
}
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 9: break;
case 2:
{ /* Ignore */
}
case 10: break;
case 3:
{ return new Token(Token.ID, yytext(), yyline+1, yycolumn+1);
}
case 11: break;
case 4:
{ return new Token(Token.NUM, yytext(), yyline+1, yycolumn+1);
}
case 12: break;
case 5:
{ return new Token(Token.LSBR, yytext(), yyline+1, yycolumn+1);
}
case 13: break;
case 6:
{ return new Token(Token.RSBR, yytext(), yyline+1, yycolumn+1);
}
case 14: break;
case 7:
{ return new Token(Token.COMMA, yytext(), yyline+1, yycolumn+1);
}
case 15: break;
case 8:
{ return new Token(Token.NULL, yytext(), yyline+1, yycolumn+1);
}
case 16: break;
default:
zzScanError(ZZ_NO_MATCH);
}
}
}
}
}

658
ÜB-Praxis-JFlex Scanner für AS-Leer/src/de/dhbw/compiler/jflexasscanner/JFlexASScanner.java~ Normal file
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/* The following code was generated by JFlex 1.6.1 */
/* **********************************************
* Duale Hochschule Baden-Württemberg Karlsruhe
* Prof. Dr. Jörn Eisenbiegler
*
* Vorlesung Übersetzerbau
* Praxis AS-Scanner mit JFlex 4
*
* **********************************************
*/
package de.dhbw.compiler.jflexasscanner;
/**
* This class is a scanner generated by
* <a href="http://www.jflex.de/">JFlex</a> 1.6.1
* from the specification file <tt>C:/Development/Schule/Java/ÜB-Praxis-JFlex Scanner für AS-Leer/src/de/dhbw/compiler/jflexasscanner/JFlexASScanner.flex</tt>
*/
public final class JFlexASScanner {
/** 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;
public static final int NUM = 2;
public static final int FRAC = 4;
public static final int EXP = 6;
public static final int STR = 8;
public static final int NULL = 10;
/**
* 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1
};
/**
* Translates characters to character classes
*/
private static final String ZZ_CMAP_PACKED =
"\10\0\3\1\2\0\1\1\22\0\1\1\13\0\1\11\3\0\12\3"+
"\7\0\32\2\1\7\1\0\1\10\3\0\13\2\1\6\1\2\1\4"+
"\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";
/**
* Translates characters to character classes
*/
private static final char [] ZZ_CMAP = zzUnpackCMap(ZZ_CMAP_PACKED);
/**
* Translates DFA states to action switch labels.
*/
private static final int [] ZZ_ACTION = zzUnpackAction();
private static final String ZZ_ACTION_PACKED_0 =
"\2\0\1\1\1\2\1\3\1\4\1\3\1\5\1\6"+
"\1\7\2\3\1\10";
private static int [] zzUnpackAction() {
int [] result = new int[13];
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\12\0\12\0\24\0\36\0\50\0\62\0\12"+
"\0\12\0\12\0\74\0\106\0\36";
private static int [] zzUnpackRowMap() {
int [] result = new int[13];
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\3\1\4\1\5\1\6\1\7\2\5\1\10\1\11"+
"\1\12\13\0\1\4\12\0\5\5\5\0\1\5\1\6"+
"\3\5\5\0\3\5\1\13\1\5\5\0\4\5\1\14"+
"\5\0\4\5\1\15\3\0";
private static int [] zzUnpackTrans() {
int [] result = new int[80];
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[] = {
"Unknown 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\10\1\11\4\1\3\11\3\1";
private static int [] zzUnpackAttribute() {
int [] result = new int[13];
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;
/** denotes if the user-EOF-code has already been executed */
private boolean zzEOFDone;
/**
* The number of occupied positions in zzBuffer beyond zzEndRead.
* When a lead/high surrogate has been read from the input stream
* into the final zzBuffer position, this will have a value of 1;
* otherwise, it will have a value of 0.
*/
private int zzFinalHighSurrogate = 0;
/* user code: */
/**
* Creates a new scanner
*
* @param in the java.io.Reader to read input from.
*/
public JFlexASScanner(java.io.Reader in) {
this.zzReader = in;
}
/**
* Unpacks the compressed character translation table.
*
* @param packed the packed character translation table
* @return the unpacked character translation table
*/
private static char [] zzUnpackCMap(String packed) {
char [] map = new char[0x110000];
int i = 0; /* index in packed string */
int j = 0; /* index in unpacked array */
while (i < 80) {
int count = packed.charAt(i++);
char value = packed.charAt(i++);
do map[j++] = value; while (--count > 0);
}
return map;
}
/**
* 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) {
zzEndRead += zzFinalHighSurrogate;
zzFinalHighSurrogate = 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 - zzFinalHighSurrogate) {
/* if not: blow it up */
char newBuffer[] = new char[zzBuffer.length*2];
System.arraycopy(zzBuffer, 0, newBuffer, 0, zzBuffer.length);
zzBuffer = newBuffer;
zzEndRead += zzFinalHighSurrogate;
zzFinalHighSurrogate = 0;
}
/* fill the buffer with new input */
int requested = zzBuffer.length - zzEndRead;
int numRead = zzReader.read(zzBuffer, zzEndRead, requested);
/* not supposed to occur according to specification of java.io.Reader */
if (numRead == 0) {
throw new java.io.IOException("Reader returned 0 characters. See JFlex examples for workaround.");
}
if (numRead > 0) {
zzEndRead += numRead;
/* If numRead == requested, we might have requested to few chars to
encode a full Unicode character. We assume that a Reader would
otherwise never return half characters. */
if (numRead == requested) {
if (Character.isHighSurrogate(zzBuffer[zzEndRead - 1])) {
--zzEndRead;
zzFinalHighSurrogate = 1;
}
}
/* potentially more input available */
return false;
}
/* numRead < 0 ==> end of stream */
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>.
*
* Internal scan buffer is resized down to its initial length, if it has grown.
*
* @param reader the new input stream
*/
public final void yyreset(java.io.Reader reader) {
zzReader = reader;
zzAtBOL = true;
zzAtEOF = false;
zzEOFDone = false;
zzEndRead = zzStartRead = 0;
zzCurrentPos = zzMarkedPos = 0;
zzFinalHighSurrogate = 0;
yyline = yychar = yycolumn = 0;
zzLexicalState = YYINITIAL;
if (zzBuffer.length > ZZ_BUFFERSIZE)
zzBuffer = new char[ZZ_BUFFERSIZE];
}
/**
* 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 Token nextToken() 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;
boolean zzR = false;
int zzCh;
int zzCharCount;
for (zzCurrentPosL = zzStartRead ;
zzCurrentPosL < zzMarkedPosL ;
zzCurrentPosL += zzCharCount ) {
zzCh = Character.codePointAt(zzBufferL, zzCurrentPosL, zzMarkedPosL);
zzCharCount = Character.charCount(zzCh);
switch (zzCh) {
case '\u000B':
case '\u000C':
case '\u0085':
case '\u2028':
case '\u2029':
yyline++;
yycolumn = 0;
zzR = false;
break;
case '\r':
yyline++;
yycolumn = 0;
zzR = true;
break;
case '\n':
if (zzR)
zzR = false;
else {
yyline++;
yycolumn = 0;
}
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:
{ throw new Error("Illegal character <" + yytext() + ">");
}
case 9: break;
case 2:
{ /* Ignore */
}
case 10: break;
case 3:
{ return new Token(Token.ID, yytext(), yyline+1, yycolumn+1);
}
case 11: break;
case 4:
{ return new Token(Token.NUM, yytext(), yyline+1, yycolumn+1);
}
case 12: break;
case 5:
{ return new Token(Token.LSBR, yytext(), yyline+1, yycolumn+1);
}
case 13: break;
case 6:
{ return new Token(Token.RSBR, yytext(), yyline+1, yycolumn+1);
}
case 14: break;
case 7:
{ return new Token(Token.COMMA, yytext(), yyline+1, yycolumn+1);
}
case 15: break;
case 8:
{ return new Token(Token.NULL, yytext(), yyline+1, yycolumn+1);
}
case 16: break;
default:
zzScanError(ZZ_NO_MATCH);
}
}
}
}
}

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/* **********************************************
* Duale Hochschule Baden-Württemberg Karlsruhe
* Prof. Dr. Jörn Eisenbiegler
*
* Vorlesung Übersetzerbau
* Praxis AS-Scanner mit JFlex
*
* **********************************************
*/
package de.dhbw.compiler.jflexasscanner;
import java.io.StringReader;
public class JFlexASScannerMain {
private static final String TEST = "[34, x,peter, 34kurt, g56, null,null, 8] ";
public static void main(String[] args) throws Exception {
JFlexASScanner scanner = new JFlexASScanner(new StringReader(TEST));
/*
* Lesen Sie hier die einzelnen Token des oben angebenen String mit Hilfe des
* Scanners ein und geben Sie sie auf die Konsole aus.
*/
}
}

25
ÜB-Praxis-JFlex Scanner für AS-Leer/src/de/dhbw/compiler/jflexasscanner/NumToken.java Normal file
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/* **********************************************
* Duale Hochschule Baden-Württemberg Karlsruhe
* Prof. Dr. Jörn Eisenbiegler
*
* Vorlesung Übersetzerbau
* Praxis AS-Scanner mit JFlex
* - Token-Definition num
*
* **********************************************
*/
package de.dhbw.compiler.jflexasscanner;
public class NumToken extends Token {
public NumToken(int type, String text, int line, int column) {
super(type,text,line,column);
}
int getValue() {
return 0;
}
}

28
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/* **********************************************
* Duale Hochschule Baden-Württemberg Karlsruhe
* Prof. Dr. Jörn Eisenbiegler
*
* Vorlesung Übersetzerbau
* Praxis AS-Scanner mit JFlex
* - Token-Definition frac
*
* **********************************************
*/
package de.dhbw.compiler.jflexasscanner;
public class StringToken extends Token {
private String value;
public StringToken(int type, String text, int line, int column, String value) {
super(type,text,line,column);
this.value = value;
}
String getValue() {
return value;
}
}

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/* **********************************************
* Duale Hochschule Baden-Württemberg Karlsruhe
* Prof. Dr. Jörn Eisenbiegler
*
* Vorlesung Übersetzerbau
* Praxis AS-Scanner mit JFlex
* - Testfälle Aufgabe 1
*
* **********************************************
*/
package de.dhbw.compiler.jflexasscanner;
import org.junit.Test;
public class TestASScanner1 extends TokenStreamTest {
@Test
public void tokenLSBR() throws Exception {
testTokenList(" [ ", false, new Token(Token.LSBR,"[",1,3));
}
@Test
public void tokenRSBR() throws Exception {
testTokenList(" ] ", false, new Token(Token.RSBR,"]",1,3));
}
@Test
public void tokenCOMMA() throws Exception {
testTokenList(" , ", false, new Token(Token.COMMA,",",1,3));
}
@Test
public void tokenZAHL() throws Exception {
testTokenList(" 0 ", false, new Token(Token.NUM,"0",1,3));
testTokenList(" 9 ", false, new Token(Token.NUM,"9",1,3));
testTokenList(" 1234567890 ", false, new Token(Token.NUM,"1234567890",1,3));
}
@Test
public void tokenID() throws Exception {
testTokenList(" a ", false, new Token(Token.ID,"a",1,3));
testTokenList(" A ", false, new Token(Token.ID,"A",1,3));
testTokenList(" x ", false, new Token(Token.ID,"x",1,3));
testTokenList(" X ", false, new Token(Token.ID,"X",1,3));
testTokenList(" 0a ", false, new Token(Token.ID,"0a",1,3));
testTokenList(" X0 ", false, new Token(Token.ID,"X0",1,3));
testTokenList(" 1234567890a ", false, new Token(Token.ID,"1234567890a",1,3));
testTokenList(" abcdefghijklmnopqrstuvwxyz ", false, new Token(Token.ID,"abcdefghijklmnopqrstuvwxyz",1,3));
testTokenList(" ABCDEFGHIJKLMNOPQRSTUVWXYZ ", false, new Token(Token.ID,"ABCDEFGHIJKLMNOPQRSTUVWXYZ",1,3));
testTokenList(" NULL ", false, new Token(Token.ID,"NULL",1,3));
testTokenList(" NulL ", false, new Token(Token.ID,"NulL",1,3));
}
@Test
public void tokenNULL() throws Exception {
testTokenList(" null ", false, new Token(Token.NULL,"null",1,3));
}
@Test
public void tokenEOF() throws Exception {
testTokenList(" ", false);
testTokenList(" ", false, new Token(Token.EOF,"",1,2));
testTokenList("", false, new Token(Token.EOF,"",1,1));
}
@Test
public void invalidÄ() throws Exception {
testTokenList(" ä ", false, new Token(Token.INVALID,"ä",1,2));
}
public void invalidGatter() throws Exception {
testTokenList(" # ", false, new Token(Token.INVALID,"#",1,3));
}
@Test
public void sentence1() throws Exception {
testTokenList(" [ [ ] hallo ,,,Duda,123,76", false,
new Token(Token.LSBR,"[",1,2),
new Token(Token.LSBR,"[",1,4),
new Token(Token.RSBR,"]",1,6),
new Token(Token.ID,"hallo",1,8),
new Token(Token.COMMA,",",1,14),
new Token(Token.COMMA,",",1,15),
new Token(Token.COMMA,",",1,16),
new Token(Token.ID,"Duda",1,17),
new Token(Token.COMMA,",",1,21),
new Token(Token.NUM,"123",1,22),
new Token(Token.COMMA,",",1,25),
new Token(Token.NUM,"76",1,26));
}
@Test
public void sentence2() throws Exception {
testTokenList("[34, x,peter, 34kurt, g56, null,null, 8]", false,
new Token(Token.LSBR,"[",1,1),
new Token(Token.NUM,"34",1,2),
new Token(Token.COMMA,",",1,4),
new Token(Token.ID,"x",1,6),
new Token(Token.COMMA,",",1,7),
new Token(Token.ID,"peter",1,8),
new Token(Token.COMMA,",",1,13),
new Token(Token.ID,"34kurt",1,16),
new Token(Token.COMMA,",",1,22),
new Token(Token.ID,"g56",1,24),
new Token(Token.COMMA,",",1,27),
new Token(Token.NULL,"null",1,29),
new Token(Token.COMMA,",",1,33),
new Token(Token.NULL,"null",1,34),
new Token(Token.COMMA,",",1,38),
new Token(Token.NUM,"8",1,40),
new Token(Token.RSBR,"]",1,41));
}
@Test
public void sentence3() throws Exception {
testTokenList("[ a, b, \n c, \r\nd]", false,
new Token(Token.LSBR,"[",1,1),
new Token(Token.ID,"a",1,3),
new Token(Token.COMMA,",",1,4),
new Token(Token.ID,"b",1,6),
new Token(Token.COMMA,",",1,7),
new Token(Token.ID,"c",2,2),
new Token(Token.COMMA,",",2,3),
new Token(Token.ID,"d",3,1),
new Token(Token.RSBR,"]",3,2));
}
}

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/* **********************************************
* Duale Hochschule Baden-Württemberg Karlsruhe
* Prof. Dr. Jörn Eisenbiegler
*
* Vorlesung Übersetzerbau
* Praxis AS-Scanner mit JFlex
* - Testfälle Aufgabe 1
*
* **********************************************
*/
package de.dhbw.compiler.jflexasscanner;
import org.junit.Test;
public class TestASScanner2 extends TokenStreamTest {
@Test
public void token1_1() throws Exception {
testTokenList(" 1.1 ", false, new Token(Token.FRAC,"1.1",1,3));
}
@Test
public void token1_() throws Exception {
testTokenList(" 1. ", false, new Token(Token.FRAC,"1.",1,3));
}
@Test
public void token_1() throws Exception {
testTokenList(" .1 ", false,
new Token(Token.INVALID,".",1,3),
new Token(Token.NUM,"1",1,4));
}
@Test
public void token1_1_1() throws Exception {
testTokenList(" 1.1^1 ", false, new Token(Token.FRAC,"1.1^1",1,3));
}
@Test
public void token1__1() throws Exception {
testTokenList(" 1.^1 ", false, new Token(Token.FRAC,"1.^1",1,3));
}
@Test
public void token0120_01230_01230() throws Exception {
testTokenList(" 01234567890.01234567890^01234567890 ", false,
new Token(Token.FRAC,"01234567890.01234567890^01234567890",1,3));
}
@Test
public void token0120_01230_() throws Exception {
testTokenList(" 01230.01230^ ", false,
new Token(Token.FRAC,"01230.01230",1,3),
new Token(Token.INVALID,"^",1,14));
}
@Test
public void token0120_0abc() throws Exception {
testTokenList(" 01230.0abc",false,
new Token(Token.FRAC,"01230.0",1,3),
new Token(Token.ID,"abc",1,10));
}
@Test
public void token0120_abc() throws Exception {
testTokenList(" 01230.abc", false,
new Token(Token.FRAC,"01230.",1,3),
new Token(Token.ID,"abc",1,9));
}
@Test
public void token0120_0_45LSBR() throws Exception {
testTokenList(" 01230.0^45[", false,
new Token(Token.FRAC,"01230.0^45",1,3),
new Token(Token.LSBR,"[",1,13));
}
@Test
public void sentence1() throws Exception {
testTokenList("[ hallo, 23.45, 4., 5.^56, 0.0^00, 78]", false,
new Token(Token.LSBR,"[",1,1),
new Token(Token.ID,"hallo",1,3),
new Token(Token.COMMA,",",1,8),
new Token(Token.FRAC,"23.45",1,10),
new Token(Token.COMMA,",",1,15),
new Token(Token.FRAC,"4.",1,17),
new Token(Token.COMMA,",",1,19),
new Token(Token.FRAC,"5.^56",1,21),
new Token(Token.COMMA,",",1,26),
new Token(Token.FRAC,"0.0^00",1,28),
new Token(Token.COMMA,",",1,34),
new Token(Token.NUM,"78",1,36),
new Token(Token.RSBR,"]",1,38));
}
}

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/* **********************************************
* Duale Hochschule Baden-Württemberg Karlsruhe
* Prof. Dr. Jörn Eisenbiegler
*
* Vorlesung Übersetzerbau
* Praxis AS-Scanner mit JFlex
* - Testfälle Aufgabe 2
*
* **********************************************
*/
package de.dhbw.compiler.jflexasscanner;
import org.junit.Test;
public class TestASScanner3 extends TokenStreamTest {
@Test
public void tokenInt() throws Exception {
testTokenList(" 0 ", true, new Token(Token.NUM,"0",1,3));
testTokenList(" 00 ", true, new Token(Token.NUM,"00",1,3));
testTokenList(" 1 ", true, new Token(Token.NUM,"1",1,3));
testTokenList(" 12 ", true, new Token(Token.NUM,"12",1,3));
testTokenList(" 123 ", true, new Token(Token.NUM,"123",1,3));
testTokenList(" 1234567890 ", true, new Token(Token.NUM,"1234567890",1,3));
testTokenList(" 078 ", true, new Token(Token.NUM,"078",1,3));
testTokenList(" 004500 ", true, new Token(Token.NUM,"004500",1,3));
}
@Test
public void tokenFrac0() throws Exception {
testTokenList(" 0. ", true, new Token(Token.FRAC,"0.",1,3));
testTokenList(" 0.0 ", true, new Token(Token.FRAC,"0.0",1,3));
testTokenList(" 0.0^0 ", true, new Token(Token.FRAC,"0.0^0",1,3));
}
@Test
public void tokenFrac1() throws Exception {
testTokenList(" 1. ", true, new Token(Token.FRAC,"1.",1,3));
testTokenList(" 1.1 ", true, new Token(Token.FRAC,"1.1",1,3));
testTokenList(" 1.1^1 ", true, new Token(Token.FRAC,"1.1^1",1,3));
}
@Test
public void tokenFrac123() throws Exception {
testTokenList(" 0.12^34 ", true, new Token(Token.FRAC,"0.12^34",1,3));
testTokenList(" 0.045^0023 ", true, new Token(Token.FRAC,"0.045^0023",1,3));
testTokenList(" 123.4560^7890 ", true, new Token(Token.FRAC,"123.4560^7890",1,3));
}
@Test
public void tokenID() throws Exception {
testTokenList(" 012abc ", true, new Token(Token.ID,"012abc",1,3));
testTokenList(" 012abc34 ", true, new Token(Token.ID,"012abc34",1,3));
}
}

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/* **********************************************
* Duale Hochschule Baden-Württemberg Karlsruhe
* Prof. Dr. Jörn Eisenbiegler
*
* Vorlesung Übersetzerbau
* Praxis AS-Scanner mit JFlex
* - Testfälle Aufgabe 3
*
* **********************************************
*/
package de.dhbw.compiler.jflexasscanner;
import org.junit.Test;
public class TestASScanner4 extends TokenStreamTest {
@Test
public void tokenTo() throws Exception {
testTokenList(" .. ", false, new Token(Token.TO,"..",1,3));
}
@Test
public void tokenNumToNum() throws Exception {
testTokenList(" 4 .. 5 ", false,
new Token(Token.NUM,"4",1,3),
new Token(Token.TO,"..",1,5),
new Token(Token.NUM,"5",1,8));
testTokenList(" 4..5 ", false,
new Token(Token.NUM,"4",1,3),
new Token(Token.TO,"..",1,4),
new Token(Token.NUM,"5",1,6));
testTokenList(" 4......5 ", false,
new Token(Token.NUM,"4",1,3),
new Token(Token.TO,"..",1,4),
new Token(Token.TO,"..",1,6),
new Token(Token.TO,"..",1,8),
new Token(Token.NUM,"5",1,10));
}
@Test
public void tokenFracToNum() throws Exception {
testTokenList(" 4. .. 5 ", false,
new Token(Token.FRAC,"4.",1,3),
new Token(Token.TO,"..",1,6),
new Token(Token.NUM,"5",1,9));
testTokenList(" 4.5 ", false, new Token(Token.FRAC,"4.5",1,3));
testTokenList(" 4...5 ", false,
new Token(Token.FRAC,"4.",1,3),
new Token(Token.TO,"..",1,5),
new Token(Token.NUM,"5",1,7));
testTokenList(" 4.......5 ", false,
new Token(Token.FRAC,"4.",1,3),
new Token(Token.TO,"..",1,5),
new Token(Token.TO,"..",1,7),
new Token(Token.TO,"..",1,9),
new Token(Token.NUM,"5",1,11));
}
}

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/* **********************************************
* Duale Hochschule Baden-Württemberg Karlsruhe
* Prof. Dr. Jörn Eisenbiegler
*
* Vorlesung Übersetzerbau
* Praxis AS-Scanner mit JFlex
* - Testfälle Aufgabe 3
*
* **********************************************
*/
package de.dhbw.compiler.jflexasscanner;
import org.junit.Test;
public class TestASScanner5 extends TokenStreamTest {
@Test
public void stringABC() throws Exception {
testTokenList("\"abc\"", true,
new Token(Token.STR,"\"abc\"",1,1));
testTokenList(" \"abc\" ", true,
new Token(Token.STR,"\"abc\"",1,2));
}
@Test
public void stringEmpty() throws Exception {
testTokenList(" \"\" ", true,
new Token(Token.STR,"\"\"",1,2));
testTokenList(" \" \" ", true,
new Token(Token.STR,"\" \"",1,2));
}
@Test
public void stringEscape() throws Exception {
testTokenList("\"\\\"\"", true,
new Token(Token.STR,"\"\\\"\"",1,1));
testTokenList(" \"\\\"\\\"\\\"\" ", true,
new Token(Token.STR,"\"\\\"\\\"\\\"\"",1,2));
testTokenList(" \" \\\" \" ", true,
new Token(Token.STR,"\" \\\" \"",1,2));
}
@Test
public void stringAll() throws Exception {
testTokenList("\"abcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ\\\" \"", true,
new Token(Token.STR,"\"abcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ\\\" \"",1,1));
testTokenList("\"abcde\\\"\"\"fg\\\"hi\" \"jkl\\\"\"", true,
new Token(Token.STR,"\"abcde\\\"\"",1,1),
new Token(Token.STR,"\"fg\\\"hi\"",1,10),
new Token(Token.STR,"\"jkl\\\"\"",1,19));
}
}

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/* **********************************************
* Duale Hochschule Baden-Württemberg Karlsruhe
* Prof. Dr. Jörn Eisenbiegler
*
* Vorlesung Übersetzerbau
* Praxis AS-Scanner mit JFlex
* - Testsuite
*
* **********************************************
*/
package de.dhbw.compiler.jflexasscanner;
import org.junit.runner.RunWith;
import org.junit.runners.Suite;
import org.junit.runners.Suite.SuiteClasses;
@RunWith(Suite.class)
@SuiteClasses({ TestASScanner1.class, TestASScanner2.class, TestASScanner3.class, TestASScanner4.class, TestASScanner5.class })
public class TestsAll {
}

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/* **********************************************
* Duale Hochschule Baden-Württemberg Karlsruhe
* Prof. Dr. Jörn Eisenbiegler
*
* Vorlesung Übersetzerbau
* Praxis AS-Scanner mit JFlex
* - Token-Definition
*
* **********************************************
*/
package de.dhbw.compiler.jflexasscanner;
public class Token {
public static final int EOF = 0;
public static final int INVALID = -1;
public static final int LSBR = 1;
public static final int RSBR = 2;
public static final int COMMA = 3;
public static final int NUM = 4;
public static final int ID = 5;
public static final int NULL = 6;
public static final int FRAC = 7;
public static final int TO = 8;
public static final int STR = 9;
private int type;
private String text;
private int line;
private int columnm;
public Token(int type, String text, int line, int column) {
this.type = type;
this.text = text;
this.line = line;
this.columnm = column;
}
public Token(int type, String text) {
this(type,text,0,0);
}
public int getType() {
return type;
}
public String getText() {
return text;
}
public int getLine() {
return line;
}
public int getColumn() {
return columnm;
}
public String toString() {
return "(" + getTypeName(type) + "," + text + "," + line + "," + columnm + ")";
}
public static String getTypeName(int tokenType) {
switch (tokenType) {
case EOF: return "EOF";
case INVALID: return "INVALID";
case LSBR: return "LSBR";
case RSBR: return "RSBR";
case COMMA: return "COMMA";
case NUM: return "NUM";
case ID: return "ID";
case NULL: return "NULL";
case FRAC: return "FRAC";
case TO: return "TO";
case STR: return "STR";
default: return "Unknown token type!";
}
}
}

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/* **********************************************
* Duale Hochschule Baden-Württemberg Karlsruhe
* Prof. Dr. Jörn Eisenbiegler
*
* Vorlesung Übersetzerbau
* Praxis AS-Scanner mit JFlex
* - Testfall-Utility
*
* **********************************************
*/
package de.dhbw.compiler.jflexasscanner;
import static org.junit.Assert.assertEquals;
import java.io.StringReader;
public abstract class TokenStreamTest {
protected void testTokenList(String in, boolean convert, Token... TokenList) throws Exception {
JFlexASScanner scanner = new JFlexASScanner(new StringReader(in));
Token myToken;
for (Token expected : TokenList) {
myToken = scanner.nextToken();
assertEquals("Expect Token "+expected.toString()+". Error in type.",
expected.getType(), myToken.getType());
assertEquals("Expect Token "+expected.toString()+". Error in text.",
expected.getText(), myToken.getText());
assertEquals("Expect Token "+expected.toString()+". Error in line.",
expected.getLine(), myToken.getLine());
assertEquals("Expect Token "+expected.toString()+". Error in column.",
expected.getColumn(), myToken.getColumn());
if (convert) {
switch (myToken.getType()) {
case Token.NUM:
int intValue = Integer.parseInt(expected.getText());
assertEquals("Expected Token value "+intValue,
intValue,((NumToken)myToken).getValue());
break;
case Token.FRAC:
double doubleValue = Double.parseDouble(expected.getText().replace("^", "e"));
assertEquals("Expected Token value "+doubleValue,
doubleValue,((FracToken)myToken).getValue(), doubleValue*0.0000001);
break;
case Token.STR:
String stringValue = expected.getText().replace("\\\"", "\"");
stringValue = stringValue.substring(1,stringValue.length()-1);
assertEquals("Expected Token value "+stringValue,
stringValue,((StringToken)myToken).getValue());
break;
}
}
}
myToken = scanner.nextToken();
assertEquals("Expected End of File (EOF), read " + myToken.toString() + ".", Token.EOF, myToken.getType());
}
}