[03 - JFlex Scanner] Get TestASScanner1 to work

ÜB-Praxis-JFlex Scanner für AS-Leer/bin/de/dhbw/compiler/jflexasscanner/JFlexASScanner.flex

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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 FRAC, EXP, STR, NULL, ID, NUM
+
+%{
+    String idValue = "";
+    int intValue = 0;
+%}
+
+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); }
+{WhiteSpace}             { /* Ignore */ }
+<YYINITIAL> {
+    "null"                       { return new Token(Token.NULL, yytext(), yyline+1, yycolumn+1); }
+    {AllChars}                   { yybegin(ID);
+                                   idValue = yytext(); System.out.println("BEGIN ID <"+idValue+">"); }
+    {Numbers}                    { yybegin(NUM);
+                                   intValue = yycharat(0)-'0'; }
+    [\[]                         { return new Token(Token.LSBR, yytext(), yyline+1, yycolumn+1); }
+    [\]]                         { return new Token(Token.RSBR, yytext(), yyline+1, yycolumn+1); }
+    [,]                          { return new Token(Token.COMMA, yytext(), yyline+1, yycolumn+1); }
+}
+
+<NUM> {
+    {Numbers}                      { intValue = intValue * 10 + yycharat(0) - '0'; }
+    {SmallChars} | {CapitalChars}  { yybegin(ID); idValue = String.valueOf(intValue); yypushback(1); }
+    [^]                            { yybegin(YYINITIAL);
+                                     yypushback(1);
+                                     return new NumToken(String.valueOf(intValue), yyline+1, yycolumn+1); }
+
+<ID> {
+    {AllChars}                      { idValue += yytext(); }
+}
+<ID>        [^]                      { 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); }
+
+
+[^]                      { return new Token(Token.INVALID, yytext(), yyline+1, yycolumn+1);
+                            /*throw new Error("Illegal character <" + yytext() + ">"); */}
+
+
+