Issue #12: Excessive memory consumption in parse() (contributed by glen.tw)

git-svn-id: http://json-simple.googlecode.com/svn/trunk@206 b68fe964-5755-0410-a06c-9fee2ea08261

Author: fangyidong

doc/json.lex

@@ -46,7 +46,7 @@ FALLBACK_CH = .
 												}
 <STRING_BEGIN> \\				{sb.append('\\');}
 
-<YYINITIAL> \" 					{ sb.delete(0, sb.length());yybegin(STRING_BEGIN);}
+<YYINITIAL> \" 					{ sb = null; sb = new StringBuffer(); yybegin(STRING_BEGIN);}
 <YYINITIAL> {INT}				{ Long val=Long.valueOf(yytext()); return new Yytoken(Yytoken.TYPE_VALUE, val);}
 <YYINITIAL> {DOUBLE}			{ Double val=Double.valueOf(yytext()); return new Yytoken(Yytoken.TYPE_VALUE, val);}
 <YYINITIAL> "true"|"false"		{ Boolean val=Boolean.valueOf(yytext()); return new Yytoken(Yytoken.TYPE_VALUE, val);}
@@ -58,4 +58,4 @@ FALLBACK_CH = .
 <YYINITIAL> ","					{ return new Yytoken(Yytoken.TYPE_COMMA,null);}
 <YYINITIAL> ":"					{ return new Yytoken(Yytoken.TYPE_COLON,null);}
 <YYINITIAL> {WS}+		    	{}
-<YYINITIAL> {FALLBACK_CH}		{ throw new ParseException(yychar, ParseException.ERROR_UNEXPECTED_CHAR, new Character(yycharat(0)));}
+<YYINITIAL> {FALLBACK_CH}		{ throw new ParseException(yychar, ParseException.ERROR_UNEXPECTED_CHAR, new Character(yycharat(0)));}