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from hypothesis import given, settings, HealthCheck
from hypothesis.strategies import text, from_regex
import io
from actinide.tokenizer import *
class ReadablePort(io.StringIO):
def __repr__(self):
# Slightly friendlier debugging output
return f"ReadablePort(str={repr(self.getvalue())}, pos={self.tell()})"
def not_(f):
return lambda *args, **kwargs: not f(*args, **kwargs)
@given(text(), text())
def test_tokenize_eof(s, input):
port = ReadablePort(input)
token, lookahead, next = tokenize_eof(s, port)
assert token is None
assert lookahead == s
assert next == tokenize_eof
assert port.tell() == 0
def comment_continues(text):
if text == '':
return False
return text[0] != '\n'
@given(text(), text().filter(comment_continues))
def test_tokenize_comment_continues(s, input):
port = ReadablePort(input)
token, lookahead, next = tokenize_comment(s, port)
assert token is None
assert port.tell() == 1
assert lookahead == input[0]
assert next == tokenize_comment
@given(text(), text().filter(not_(comment_continues)))
def test_tokenize_comment_ends(s, input):
port = ReadablePort(input)
token, lookahead, next = tokenize_comment(s, port)
assert token is None
assert port.tell() == (1 if input else 0)
assert lookahead == (input[0] if input else '')
assert next == tokenize_any
@given(text(), text())
def test_tokenize_syntax(s, input):
port = ReadablePort(input)
token, lookahead, next = tokenize_syntax(s, port)
assert token == Syntax(s)
assert isinstance(token, Syntax)
assert port.tell() == (1 if input else 0)
assert lookahead == (input[0] if input else '')
assert next == tokenize_any
@given(text(), text())
def test_tokenize_whitespace(s, input):
port = ReadablePort(input)
token, lookahead, next = tokenize_whitespace(s, port)
assert token is None
assert port.tell() == (1 if input else 0)
assert lookahead == (input[0] if input else '')
assert next == tokenize_any
def symbol_continues(text):
if text == '':
return False
return text[0] not in ' \n\t();"'
@given(text(), text().filter(symbol_continues))
def test_tokenize_symbol_continues(s, input):
port = ReadablePort(input)
token, lookahead, next = tokenize_symbol(s, port)
assert token is None
assert port.tell() == 1
assert lookahead == s + input[0]
assert next == tokenize_symbol
@given(text(), text().filter(not_(symbol_continues)))
def test_tokenize_symbol_ends(s, input):
port = ReadablePort(input)
token, lookahead, next = tokenize_symbol(s, port)
assert token == Symbol(s)
assert isinstance(token, Symbol)
assert port.tell() == (1 if input else 0)
assert lookahead == (input[0] if input else '')
assert next == tokenize_any
def string_continues(text):
if text == '':
return False
return not text[0] == '"'
@given(text(), text().filter(string_continues))
def test_tokenize_string_continues(s, input):
port = ReadablePort(input)
token, lookahead, next = tokenize_string(s, port)
assert token is None
assert port.tell() == 1
assert lookahead == input[0]
assert next == tokenize_string_character
@given(text(), text().filter(not_(string_continues)))
def test_tokenize_string_ends(s, input):
try:
port = ReadablePort(input)
token, lookahead, next = tokenize_string(s, port)
assert token is None
assert port.tell() == 1
assert lookahead == ''
assert next == tokenize_string_end
except TokenError:
assert input == ''
assert port.tell() == 0
def is_escape(text):
if text == '':
return False
return text[0] == '\\'
@given(text(), text().filter(string_continues).filter(not_(is_escape)))
def test_tokenize_string_character_continues(s, input):
port = ReadablePort(input)
token, lookahead, next = tokenize_string_character(s, port)
assert token is None
assert port.tell() == 1
assert lookahead == s + input[0]
assert next == tokenize_string_character
# Using from_regex() rather than text() because searching randomly for strings
# that start with a specific character is far, _far_ too slow. (It often fails
# to find any examples.) I _think_ this preserves the property that this group
# of three tests are exhaustive, but it's not as obvious as it would be if I
# could use text() here.
@given(text(), from_regex(r'\\.*').filter(string_continues).filter(is_escape))
def test_tokenize_string_character_begins_escape(s, input):
port = ReadablePort(input)
token, lookahead, next = tokenize_string_character(s, port)
assert token is None
assert port.tell() == 1
assert lookahead == s
assert next == tokenize_escaped_string_character
@given(text(), text().filter(not_(string_continues)))
def test_tokenize_string_character_ends(s, input):
try:
port = ReadablePort(input)
token, lookahead, next = tokenize_string_character(s, port)
assert token is None
assert port.tell() == 1
assert lookahead == s
assert next == tokenize_string_end
except TokenError:
assert input == ''
assert port.tell() == 0
@given(text(), text())
def test_tokenize_escaped_string_character(s, input):
try:
port = ReadablePort(input)
token, lookahead, next = tokenize_escaped_string_character(s, port)
assert token is None
assert port.tell() == 1
assert lookahead == s + input[0]
assert next == tokenize_string_character
except TokenError:
assert input == '' or input[0] not in '\\n'
assert port.tell() == (1 if input else 0)
@given(text(), text())
def test_tokenize_string_end(s, input):
port = ReadablePort(input)
token, lookahead, next = tokenize_string_end(s, port)
assert token == s
assert isinstance(token, String)
assert port.tell() == (1 if input else 0)
assert lookahead == (input[0] if input else '')
assert next == tokenize_any
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