Adding gem5 source to svn.

git-svn-id: https://www4.informatik.uni-erlangen.de/i4svn/danceos/trunk/devel/fail@1819 8c4709b5-6ec9-48aa-a5cd-a96041d1645a

simulators/gem5/ext/ply/test/lex_state_try.py

@@ -0,0 +1,45 @@
+# lex_state_try.py
+#
+# Declaration of a state for which no rules are defined
+
+import sys
+if ".." not in sys.path: sys.path.insert(0,"..")
+
+import ply.lex as lex
+
+tokens = [ 
+    "PLUS",
+    "MINUS",
+    "NUMBER",
+    ]
+
+states = (('comment', 'exclusive'),)
+
+t_PLUS = r'\+'
+t_MINUS = r'-'
+t_NUMBER = r'\d+'
+
+t_ignore = " \t"
+
+# Comments
+def t_comment(t):
+    r'/\*'
+    t.lexer.begin('comment')
+    print("Entering comment state")
+
+def t_comment_body_part(t):
+    r'(.|\n)*\*/'
+    print("comment body %s" % t)
+    t.lexer.begin('INITIAL')
+
+def t_error(t):
+    pass
+
+t_comment_error = t_error
+t_comment_ignore = t_ignore
+
+lex.lex()
+
+data = "3 + 4 /* This is a comment */ + 10"
+
+lex.runmain(data=data)