micropython/tests/basics/lexer.py

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# test the lexer
try:
eval
exec
except NameError:
print("SKIP")
raise SystemExit
# __debug__ is a special symbol
print(type(__debug__))
# short input
exec("")
exec("\n")
exec("\n\n")
exec("\r")
exec("\r\r")
exec("\t")
exec("\r\n")
exec("\nprint(1)")
exec("\rprint(2)")
exec("\r\nprint(3)")
exec("\n5")
exec("\r6")
exec("\r\n7")
print(eval("1"))
print(eval("12"))
print(eval("123"))
print(eval("1\n"))
print(eval("12\n"))
print(eval("123\n"))
print(eval("1\r"))
print(eval("12\r"))
print(eval("123\r"))
# line continuation
print(eval("'123' \\\r '456'"))
print(eval("'123' \\\n '456'"))
print(eval("'123' \\\r\n '456'"))
print(eval("'123'\\\r'456'"))
print(eval("'123'\\\n'456'"))
print(eval("'123'\\\r\n'456'"))
# backslash used to escape a line-break in a string
print('a\
b')
# lots of indentation
def a(x):
if x:
if x:
if x:
if x:
if x:
if x:
if x:
if x:
if x:
if x:
if x:
if x:
if x:
if x:
if x:
print(x)
a(1)
# badly formed hex escape sequences
try:
exec(r"'\x0'")
except SyntaxError:
print("SyntaxError")
try:
exec(r"b'\x0'")
except SyntaxError:
print("SyntaxError")
try:
exec(r"'\u000'")
except SyntaxError:
print("SyntaxError")
try:
exec(r"'\U0000000'")
except SyntaxError:
print("SyntaxError")