actually commit TP2

TP02/demo_files/ex1/Example1.g4

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+//define a lexical analyser called Example1
+
+lexer grammar Example1;
+
+OP : '+'| '*' | '-' | '/' ;
+DIGIT : [0-9] ;
+LETTER : [A-Za-z] ;
+ID : LETTER (LETTER | DIGIT)* ;             // match idents
+WS : [ \t\r\n]+ -> skip ; // skip spaces, tabs, newlines

TP02/demo_files/ex1/Makefile

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+MAINFILE = main
+PACKAGE = Example1
+
+ifndef ANTLR4
+$(error variable ANTLR4 is not set)
+endif
+
+default: $(PACKAGE).py
+
+$(PACKAGE).py: $(PACKAGE).g4
+	$(ANTLR4) $^ -Dlanguage=Python3
+
+run: $(MAINFILE).py $(PACKAGE)*.py
+	python3 $<
+
+clean:
+	rm -rf *~ $(PACKAGE)*.py $(PACKAGE)*.pyc *.interp *.tokens  __pycache*

TP02/demo_files/ex1/main.py

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+from antlr4 import InputStream
+from antlr4 import CommonTokenStream
+from Example1 import Example1
+
+import sys
+
+
+def main():
+    # InputStream reads characters (from stdin in our case)
+    input_stream = InputStream(sys.stdin.read())
+    # The generated lexer groups characters into Tokens ...
+    lexer = Example1(input_stream)
+    # ... and the stream of Tokens is managed by the TokenStream.
+    stream = CommonTokenStream(lexer)
+
+    # Display the token stream
+    stream.fill()  # needed to get stream.tokens (otherwise lazily filled-in)
+    for t in stream.tokens:
+        print(t)
+    print("Finished")
+
+
+# warns pb if py file is included in others
+if __name__ == '__main__':
+    main()