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cpython/Lib/test/test_tokenize.py

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doctests = """
Tests for the tokenize module.
>>> import glob, random, sys
The tests can be really simple. Given a small fragment of source
code, print out a table with thokens. The ENDMARK is omitted for
brevity.
>>> dump_tokens("1 + 1")
NUMBER '1' (1, 0) (1, 1)
OP '+' (1, 2) (1, 3)
NUMBER '1' (1, 4) (1, 5)
>>> dump_tokens("if False:\\n"
... " # NL\\n"
... " True = False # NEWLINE\\n")
NAME 'if' (1, 0) (1, 2)
NAME 'False' (1, 3) (1, 8)
OP ':' (1, 8) (1, 9)
NEWLINE '\\n' (1, 9) (1, 10)
COMMENT '# NL' (2, 4) (2, 8)
NL '\\n' (2, 8) (2, 9)
INDENT ' ' (3, 0) (3, 4)
NAME 'True' (3, 4) (3, 8)
OP '=' (3, 9) (3, 10)
NAME 'False' (3, 11) (3, 16)
COMMENT '# NEWLINE' (3, 17) (3, 26)
NEWLINE '\\n' (3, 26) (3, 27)
DEDENT '' (4, 0) (4, 0)
>>> indent_error_file = \"""
... def k(x):
... x += 2
... x += 5
... \"""
>>> for tok in generate_tokens(StringIO(indent_error_file).readline): pass
Traceback (most recent call last):
...
IndentationError: unindent does not match any outer indentation level
Test roundtrip for `untokenize`. `f` is an open file or a string. The source
code in f is tokenized, converted back to source code via tokenize.untokenize(),
and tokenized again from the latter. The test fails if the second tokenization
doesn't match the first.
>>> def roundtrip(f):
... if isinstance(f, str): f = StringIO(f)
... token_list = list(generate_tokens(f.readline))
... f.close()
... tokens1 = [tok[:2] for tok in token_list]
... new_text = untokenize(tokens1)
... readline = iter(new_text.splitlines(1)).__next__
... tokens2 = [tok[:2] for tok in generate_tokens(readline)]
... return tokens1 == tokens2
...
There are some standard formattig practises that are easy to get right.
>>> roundtrip("if x == 1:\\n"
... " print(x)\\n")
True
>>> roundtrip("# This is a comment\\n# This also")
True
Some people use different formatting conventions, which makes
untokenize a little trickier. Note that this test involves trailing
whitespace after the colon. Note that we use hex escapes to make the
two trailing blanks apperant in the expected output.
>>> roundtrip("if x == 1 : \\n"
... " print(x)\\n")
True
>>> f = test_support.findfile("tokenize_tests.txt")
>>> roundtrip(open(f))
True
>>> roundtrip("if x == 1:\\n"
... " # A comment by itself.\\n"
... " print(x) # Comment here, too.\\n"
... " # Another comment.\\n"
... "after_if = True\\n")
True
>>> roundtrip("if (x # The comments need to go in the right place\\n"
... " == 1):\\n"
... " print('x==1')\\n")
True
>>> roundtrip("class Test: # A comment here\\n"
... " # A comment with weird indent\\n"
... " after_com = 5\\n"
... " def x(m): return m*5 # a one liner\\n"
... " def y(m): # A whitespace after the colon\\n"
... " return y*4 # 3-space indent\\n")
True
Some error-handling code
>>> roundtrip("try: import somemodule\\n"
... "except ImportError: # comment\\n"
... " print 'Can not import' # comment2\\n"
... "else: print 'Loaded'\\n")
True
Balancing contunuation
>>> roundtrip("a = (3,4, \\n"
... "5,6)\\n"
... "y = [3, 4,\\n"
... "5]\\n"
... "z = {'a': 5,\\n"
... "'b':15, 'c':True}\\n"
... "x = len(y) + 5 - a[\\n"
... "3] - a[2]\\n"
... "+ len(z) - z[\\n"
... "'b']\\n")
True
Ordinary integers and binary operators
>>> dump_tokens("0xff <= 255")
NUMBER '0xff' (1, 0) (1, 4)
OP '<=' (1, 5) (1, 7)
NUMBER '255' (1, 8) (1, 11)
>>> dump_tokens("01234567 > ~0x15")
NUMBER '01234567' (1, 0) (1, 8)
OP '>' (1, 9) (1, 10)
OP '~' (1, 11) (1, 12)
NUMBER '0x15' (1, 12) (1, 16)
>>> dump_tokens("2134568 != 01231515")
NUMBER '2134568' (1, 0) (1, 7)
OP '!=' (1, 8) (1, 10)
NUMBER '01231515' (1, 11) (1, 19)
>>> dump_tokens("(-124561-1) & 0200000000")
OP '(' (1, 0) (1, 1)
OP '-' (1, 1) (1, 2)
NUMBER '124561' (1, 2) (1, 8)
OP '-' (1, 8) (1, 9)
NUMBER '1' (1, 9) (1, 10)
OP ')' (1, 10) (1, 11)
OP '&' (1, 12) (1, 13)
NUMBER '0200000000' (1, 14) (1, 24)
>>> dump_tokens("0xdeadbeef != -1")
NUMBER '0xdeadbeef' (1, 0) (1, 10)
OP '!=' (1, 11) (1, 13)
OP '-' (1, 14) (1, 15)
NUMBER '1' (1, 15) (1, 16)
>>> dump_tokens("0xdeadc0de & 012345")
NUMBER '0xdeadc0de' (1, 0) (1, 10)
OP '&' (1, 11) (1, 12)
NUMBER '012345' (1, 13) (1, 19)
>>> dump_tokens("0xFF & 0x15 | 1234")
NUMBER '0xFF' (1, 0) (1, 4)
OP '&' (1, 5) (1, 6)
NUMBER '0x15' (1, 7) (1, 11)
OP '|' (1, 12) (1, 13)
NUMBER '1234' (1, 14) (1, 18)
Long integers
>>> dump_tokens("x = 0L")
NAME 'x' (1, 0) (1, 1)
OP '=' (1, 2) (1, 3)
NUMBER '0L' (1, 4) (1, 6)
>>> dump_tokens("x = 0xfffffffffff")
NAME 'x' (1, 0) (1, 1)
OP '=' (1, 2) (1, 3)
NUMBER '0xffffffffff (1, 4) (1, 17)
>>> dump_tokens("x = 123141242151251616110l")
NAME 'x' (1, 0) (1, 1)
OP '=' (1, 2) (1, 3)
NUMBER '123141242151 (1, 4) (1, 26)
>>> dump_tokens("x = -15921590215012591L")
NAME 'x' (1, 0) (1, 1)
OP '=' (1, 2) (1, 3)
OP '-' (1, 4) (1, 5)
NUMBER '159215902150 (1, 5) (1, 23)
Floating point numbers
>>> dump_tokens("x = 3.14159")
NAME 'x' (1, 0) (1, 1)
OP '=' (1, 2) (1, 3)
NUMBER '3.14159' (1, 4) (1, 11)
>>> dump_tokens("x = 314159.")
NAME 'x' (1, 0) (1, 1)
OP '=' (1, 2) (1, 3)
NUMBER '314159.' (1, 4) (1, 11)
>>> dump_tokens("x = .314159")
NAME 'x' (1, 0) (1, 1)
OP '=' (1, 2) (1, 3)
NUMBER '.314159' (1, 4) (1, 11)
>>> dump_tokens("x = 3e14159")
NAME 'x' (1, 0) (1, 1)
OP '=' (1, 2) (1, 3)
NUMBER '3e14159' (1, 4) (1, 11)
>>> dump_tokens("x = 3E123")
NAME 'x' (1, 0) (1, 1)
OP '=' (1, 2) (1, 3)
NUMBER '3E123' (1, 4) (1, 9)
>>> dump_tokens("x+y = 3e-1230")
NAME 'x' (1, 0) (1, 1)
OP '+' (1, 1) (1, 2)
NAME 'y' (1, 2) (1, 3)
OP '=' (1, 4) (1, 5)
NUMBER '3e-1230' (1, 6) (1, 13)
>>> dump_tokens("x = 3.14e159")
NAME 'x' (1, 0) (1, 1)
OP '=' (1, 2) (1, 3)
NUMBER '3.14e159' (1, 4) (1, 12)
String literals
>>> dump_tokens("x = ''; y = \\\"\\\"")
NAME 'x' (1, 0) (1, 1)
OP '=' (1, 2) (1, 3)
STRING "''" (1, 4) (1, 6)
OP ';' (1, 6) (1, 7)
NAME 'y' (1, 8) (1, 9)
OP '=' (1, 10) (1, 11)
STRING '""' (1, 12) (1, 14)
>>> dump_tokens("x = '\\\"'; y = \\\"'\\\"")
NAME 'x' (1, 0) (1, 1)
OP '=' (1, 2) (1, 3)
STRING '\\'"\\'' (1, 4) (1, 7)
OP ';' (1, 7) (1, 8)
NAME 'y' (1, 9) (1, 10)
OP '=' (1, 11) (1, 12)
STRING '"\\'"' (1, 13) (1, 16)
>>> dump_tokens("x = \\\"doesn't \\\"shrink\\\", does it\\\"")
NAME 'x' (1, 0) (1, 1)
OP '=' (1, 2) (1, 3)
STRING '"doesn\\'t "' (1, 4) (1, 14)
NAME 'shrink' (1, 14) (1, 20)
STRING '", does it"' (1, 20) (1, 31)
>>> dump_tokens("x = u'abc' + U'ABC'")
NAME 'x' (1, 0) (1, 1)
OP '=' (1, 2) (1, 3)
STRING "u'abc'" (1, 4) (1, 10)
OP '+' (1, 11) (1, 12)
STRING "U'ABC'" (1, 13) (1, 19)
>>> dump_tokens('y = "ABC" + "ABC"')
NAME 'y' (1, 0) (1, 1)
OP '=' (1, 2) (1, 3)
STRING '"ABC"' (1, 4) (1, 10)
OP '+' (1, 11) (1, 12)
STRING '"ABC"' (1, 13) (1, 19)
>>> dump_tokens("x = r'abc' + r'ABC' + R'ABC' + R'ABC'")
NAME 'x' (1, 0) (1, 1)
OP '=' (1, 2) (1, 3)
STRING "r'abc'" (1, 4) (1, 11)
OP '+' (1, 12) (1, 13)
STRING "r'ABC'" (1, 14) (1, 21)
OP '+' (1, 22) (1, 23)
STRING "R'ABC'" (1, 24) (1, 31)
OP '+' (1, 32) (1, 33)
STRING "R'ABC'" (1, 34) (1, 41)
>>> dump_tokens('y = r"abc" + r"ABC" + R"ABC" + R"ABC"')
NAME 'y' (1, 0) (1, 1)
OP '=' (1, 2) (1, 3)
STRING 'r"abc"' (1, 4) (1, 11)
OP '+' (1, 12) (1, 13)
STRING 'r"ABC"' (1, 14) (1, 21)
OP '+' (1, 22) (1, 23)
STRING 'R"ABC"' (1, 24) (1, 31)
OP '+' (1, 32) (1, 33)
STRING 'R"ABC"' (1, 34) (1, 41)
Operators
>>> dump_tokens("def d22(a, b, c=2, d=2, *k): pass")
NAME 'def' (1, 0) (1, 3)
NAME 'd22' (1, 4) (1, 7)
OP '(' (1, 7) (1, 8)
NAME 'a' (1, 8) (1, 9)
OP ',' (1, 9) (1, 10)
NAME 'b' (1, 11) (1, 12)
OP ',' (1, 12) (1, 13)
NAME 'c' (1, 14) (1, 15)
OP '=' (1, 15) (1, 16)
NUMBER '2' (1, 16) (1, 17)
OP ',' (1, 17) (1, 18)
NAME 'd' (1, 19) (1, 20)
OP '=' (1, 20) (1, 21)
NUMBER '2' (1, 21) (1, 22)
OP ',' (1, 22) (1, 23)
OP '*' (1, 24) (1, 25)
NAME 'k' (1, 25) (1, 26)
OP ')' (1, 26) (1, 27)
OP ':' (1, 27) (1, 28)
NAME 'pass' (1, 29) (1, 33)
>>> dump_tokens("def d01v_(a=1, *k, **w): pass")
NAME 'def' (1, 0) (1, 3)
NAME 'd01v_' (1, 4) (1, 9)
OP '(' (1, 9) (1, 10)
NAME 'a' (1, 10) (1, 11)
OP '=' (1, 11) (1, 12)
NUMBER '1' (1, 12) (1, 13)
OP ',' (1, 13) (1, 14)
OP '*' (1, 15) (1, 16)
NAME 'k' (1, 16) (1, 17)
OP ',' (1, 17) (1, 18)
OP '**' (1, 19) (1, 21)
NAME 'w' (1, 21) (1, 22)
OP ')' (1, 22) (1, 23)
OP ':' (1, 23) (1, 24)
NAME 'pass' (1, 25) (1, 29)
Comparison
>>> dump_tokens("if 1 < 1 > 1 == 1 >= 5 <= 0x15 <= 0x12 != " +
... "1 and 5 in 1 not in 1 is 1 or 5 is not 1: pass")
NAME 'if' (1, 0) (1, 2)
NUMBER '1' (1, 3) (1, 4)
OP '<' (1, 5) (1, 6)
NUMBER '1' (1, 7) (1, 8)
OP '>' (1, 9) (1, 10)
NUMBER '1' (1, 11) (1, 12)
OP '==' (1, 13) (1, 15)
NUMBER '1' (1, 16) (1, 17)
OP '>=' (1, 18) (1, 20)
NUMBER '5' (1, 21) (1, 22)
OP '<=' (1, 23) (1, 25)
NUMBER '0x15' (1, 26) (1, 30)
OP '<=' (1, 31) (1, 33)
NUMBER '0x12' (1, 34) (1, 38)
OP '!=' (1, 39) (1, 41)
NUMBER '1' (1, 42) (1, 43)
NAME 'and' (1, 44) (1, 47)
NUMBER '5' (1, 48) (1, 49)
NAME 'in' (1, 50) (1, 52)
NUMBER '1' (1, 53) (1, 54)
NAME 'not' (1, 55) (1, 58)
NAME 'in' (1, 59) (1, 61)
NUMBER '1' (1, 62) (1, 63)
NAME 'is' (1, 64) (1, 66)
NUMBER '1' (1, 67) (1, 68)
NAME 'or' (1, 69) (1, 71)
NUMBER '5' (1, 72) (1, 73)
NAME 'is' (1, 74) (1, 76)
NAME 'not' (1, 77) (1, 80)
NUMBER '1' (1, 81) (1, 82)
OP ':' (1, 82) (1, 83)
NAME 'pass' (1, 84) (1, 88)
Shift
>>> dump_tokens("x = 1 << 1 >> 5")
NAME 'x' (1, 0) (1, 1)
OP '=' (1, 2) (1, 3)
NUMBER '1' (1, 4) (1, 5)
OP '<<' (1, 6) (1, 8)
NUMBER '1' (1, 9) (1, 10)
OP '>>' (1, 11) (1, 13)
NUMBER '5' (1, 14) (1, 15)
Additive
>>> dump_tokens("x = 1 - y + 15 - 01 + 0x124 + z + a[5]")
NAME 'x' (1, 0) (1, 1)
OP '=' (1, 2) (1, 3)
NUMBER '1' (1, 4) (1, 5)
OP '-' (1, 6) (1, 7)
NAME 'y' (1, 8) (1, 9)
OP '+' (1, 10) (1, 11)
NUMBER '15' (1, 12) (1, 14)
OP '-' (1, 15) (1, 16)
NUMBER '01' (1, 17) (1, 19)
OP '+' (1, 20) (1, 21)
NUMBER '0x124' (1, 22) (1, 27)
OP '+' (1, 28) (1, 29)
NAME 'z' (1, 30) (1, 31)
OP '+' (1, 32) (1, 33)
NAME 'a' (1, 34) (1, 35)
OP '[' (1, 35) (1, 36)
NUMBER '5' (1, 36) (1, 37)
OP ']' (1, 37) (1, 38)
Multiplicative
>>> dump_tokens("x = 1//1*1/5*12%0x12")
NAME 'x' (1, 0) (1, 1)
OP '=' (1, 2) (1, 3)
NUMBER '1' (1, 4) (1, 5)
OP '//' (1, 5) (1, 7)
NUMBER '1' (1, 7) (1, 8)
OP '*' (1, 8) (1, 9)
NUMBER '1' (1, 9) (1, 10)
OP '/' (1, 10) (1, 11)
NUMBER '5' (1, 11) (1, 12)
OP '*' (1, 12) (1, 13)
NUMBER '12' (1, 13) (1, 15)
OP '%' (1, 15) (1, 16)
NUMBER '0x12' (1, 16) (1, 20)
Unary
>>> dump_tokens("~1 ^ 1 & 1 |1 ^ -1")
OP '~' (1, 0) (1, 1)
NUMBER '1' (1, 1) (1, 2)
OP '^' (1, 3) (1, 4)
NUMBER '1' (1, 5) (1, 6)
OP '&' (1, 7) (1, 8)
NUMBER '1' (1, 9) (1, 10)
OP '|' (1, 11) (1, 12)
NUMBER '1' (1, 12) (1, 13)
OP '^' (1, 14) (1, 15)
OP '-' (1, 16) (1, 17)
NUMBER '1' (1, 17) (1, 18)
>>> dump_tokens("-1*1/1+1*1//1 - ---1**1")
OP '-' (1, 0) (1, 1)
NUMBER '1' (1, 1) (1, 2)
OP '*' (1, 2) (1, 3)
NUMBER '1' (1, 3) (1, 4)
OP '/' (1, 4) (1, 5)
NUMBER '1' (1, 5) (1, 6)
OP '+' (1, 6) (1, 7)
NUMBER '1' (1, 7) (1, 8)
OP '*' (1, 8) (1, 9)
NUMBER '1' (1, 9) (1, 10)
OP '//' (1, 10) (1, 12)
NUMBER '1' (1, 12) (1, 13)
OP '-' (1, 14) (1, 15)
OP '-' (1, 16) (1, 17)
OP '-' (1, 17) (1, 18)
OP '-' (1, 18) (1, 19)
NUMBER '1' (1, 19) (1, 20)
OP '**' (1, 20) (1, 22)
NUMBER '1' (1, 22) (1, 23)
Selector
>>> dump_tokens("import sys, time\\nx = sys.modules['time'].time()")
NAME 'import' (1, 0) (1, 6)
NAME 'sys' (1, 7) (1, 10)
OP ',' (1, 10) (1, 11)
NAME 'time' (1, 12) (1, 16)
NEWLINE '\\n' (1, 16) (1, 17)
NAME 'x' (2, 0) (2, 1)
OP '=' (2, 2) (2, 3)
NAME 'sys' (2, 4) (2, 7)
OP '.' (2, 7) (2, 8)
NAME 'modules' (2, 8) (2, 15)
OP '[' (2, 15) (2, 16)
STRING "'time'" (2, 16) (2, 22)
OP ']' (2, 22) (2, 23)
OP '.' (2, 23) (2, 24)
NAME 'time' (2, 24) (2, 28)
OP '(' (2, 28) (2, 29)
OP ')' (2, 29) (2, 30)
Methods
>>> dump_tokens("@staticmethod\\ndef foo(x,y): pass")
OP '@' (1, 0) (1, 1)
NAME 'staticmethod (1, 1) (1, 13)
NEWLINE '\\n' (1, 13) (1, 14)
NAME 'def' (2, 0) (2, 3)
NAME 'foo' (2, 4) (2, 7)
OP '(' (2, 7) (2, 8)
NAME 'x' (2, 8) (2, 9)
OP ',' (2, 9) (2, 10)
NAME 'y' (2, 10) (2, 11)
OP ')' (2, 11) (2, 12)
OP ':' (2, 12) (2, 13)
NAME 'pass' (2, 14) (2, 18)
Backslash means line continuation, except for comments
>>> roundtrip("x=1+\\\\n"
... "1\\n"
... "# This is a comment\\\\n"
... "# This also\\n")
True
>>> roundtrip("# Comment \\\\nx = 0")
True
>>>
>>> tempdir = os.path.dirname(f) or os.curdir
>>> testfiles = glob.glob(os.path.join(tempdir, "test*.py"))
>>> if not test_support.is_resource_enabled("compiler"):
... testfiles = random.sample(testfiles, 10)
...
>>> for testfile in testfiles:
... if not roundtrip(open(testfile)): break
... else: True
True
"""
from test import test_support
from tokenize import (tokenize, untokenize, generate_tokens, NUMBER, NAME, OP,
STRING, ENDMARKER, tok_name)
from io import StringIO
import os
def dump_tokens(s):
"""Print out the tokens in s in a table format.
The ENDMARKER is omitted.
"""
f = StringIO(s)
for type, token, start, end, line in generate_tokens(f.readline):
if type == ENDMARKER:
break
type = tok_name[type]
print("%(type)-10.10s %(token)-13.13r %(start)s %(end)s" % locals())
def roundtrip(s):
f = StringIO(s)
source = untokenize(generate_tokens(f.readline))
print(source, end="")
# This is an example from the docs, set up as a doctest.
def decistmt(s):
"""Substitute Decimals for floats in a string of statements.
>>> from decimal import Decimal
>>> s = 'print(+21.3e-5*-.1234/81.7)'
>>> decistmt(s)
"print (+Decimal ('21.3e-5')*-Decimal ('.1234')/Decimal ('81.7'))"
The format of the exponent is inherited from the platform C library.
Known cases are "e-007" (Windows) and "e-07" (not Windows). Since
we're only showing 12 digits, and the 13th isn't close to 5, the
rest of the output should be platform-independent.
>>> exec(s) #doctest: +ELLIPSIS
-3.21716034272e-0...7
Output from calculations with Decimal should be identical across all
platforms.
>>> exec(decistmt(s))
-3.217160342717258261933904529E-7
"""
result = []
g = generate_tokens(StringIO(s).readline) # tokenize the string
for toknum, tokval, _, _, _ in g:
if toknum == NUMBER and '.' in tokval: # replace NUMBER tokens
result.extend([
(NAME, 'Decimal'),
(OP, '('),
(STRING, repr(tokval)),
(OP, ')')
])
else:
result.append((toknum, tokval))
return untokenize(result)
__test__ = {"doctests" : doctests, 'decistmt': decistmt}
def test_main():
from test import test_tokenize
test_support.run_doctest(test_tokenize, True)
if __name__ == "__main__":
test_main()
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