hy/tests/lex/test_lex.py

# Copyright (c) 2013 Paul Tagliamonte <paultag@debian.org>
#
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from hy.models.expression import HyExpression
from hy.models.integer import HyInteger
from hy.models.lambdalist import HyLambdaListKeyword
from hy.models.float import HyFloat
from hy.models.complex import HyComplex
from hy.models.symbol import HySymbol
from hy.models.string import HyString
from hy.models.dict import HyDict

from hy.lex import LexException, PrematureEndOfInput, tokenize


def test_lex_exception():
    """ Ensure tokenize throws a fit on a partial input """
    try:
        tokenize("(foo")
        assert True is False
    except PrematureEndOfInput:
        pass
    try:
        tokenize("{foo bar")
        assert True is False
    except PrematureEndOfInput:
        pass
    try:
        tokenize("(defn foo [bar]")
        assert True is False
    except PrematureEndOfInput:
        pass


def test_unbalanced_exception():
    """Ensure the tokenization fails on unbalanced expressions"""
    try:
        tokenize("(bar))")
        assert True is False
    except LexException:
        pass

    try:
        tokenize("(baz [quux]])")
        assert True is False
    except LexException:
        pass


def test_lex_expression_symbols():
    """ Make sure that expressions produce symbols """
    objs = tokenize("(foo bar)")
    assert objs == [HyExpression([HySymbol("foo"), HySymbol("bar")])]


def test_lex_expression_strings():
    """ Test that expressions can produce symbols """
    objs = tokenize("(foo \"bar\")")
    assert objs == [HyExpression([HySymbol("foo"), HyString("bar")])]


def test_lex_expression_integer():
    """ Make sure expressions can produce integers """
    objs = tokenize("(foo 2)")
    assert objs == [HyExpression([HySymbol("foo"), HyInteger(2)])]


def test_lex_lambda_list_keyword():
    """ Make sure expressions can produce lambda list keywords """
    objs = tokenize("(x &rest xs)")
    assert objs == [HyExpression([HySymbol("x"),
                                  HyLambdaListKeyword("&rest"),
                                  HySymbol("xs")])]


def test_lex_symbols():
    """ Make sure that symbols are valid expressions"""
    objs = tokenize("foo ")
    assert objs == [HySymbol("foo")]


def test_lex_strings():
    """ Make sure that strings are valid expressions"""
    objs = tokenize("\"foo\" ")
    assert objs == [HyString("foo")]


def test_lex_integers():
    """ Make sure that integers are valid expressions"""
    objs = tokenize("42 ")
    assert objs == [HyInteger(42)]


def test_lex_expression_float():
    """ Make sure expressions can produce floats """
    objs = tokenize("(foo 2.)")
    assert objs == [HyExpression([HySymbol("foo"), HyFloat(2.)])]
    objs = tokenize("(foo -0.5)")
    assert objs == [HyExpression([HySymbol("foo"), HyFloat(-0.5)])]
    objs = tokenize("(foo 1.e7)")
    assert objs == [HyExpression([HySymbol("foo"), HyFloat(1.e7)])]


def test_lex_expression_complex():
    """ Make sure expressions can produce complex """
    objs = tokenize("(foo 2.j)")
    assert objs == [HyExpression([HySymbol("foo"), HyComplex(2.j)])]
    objs = tokenize("(foo -0.5j)")
    assert objs == [HyExpression([HySymbol("foo"), HyComplex(-0.5j)])]
    objs = tokenize("(foo 1.e7j)")
    assert objs == [HyExpression([HySymbol("foo"), HyComplex(1.e7j)])]
    objs = tokenize("(foo j)")
    assert objs == [HyExpression([HySymbol("foo"), HySymbol("j")])]


def test_lex_line_counting():
    """ Make sure we can count lines / columns """
    entry = tokenize("(foo (one two))")[0]

    assert entry.start_line == 1
    assert entry.start_column == 1

    assert entry.end_line == 1
    assert entry.end_column == 15

    entry = entry[1]
    assert entry.start_line == 1
    assert entry.start_column == 6

    assert entry.end_line == 1
    assert entry.end_column == 14


def test_lex_line_counting_multi():
    """ Make sure we can do multi-line tokenization """
    entries = tokenize("""
(foo (one two))
(foo bar)
""")

    entry = entries[0]

    assert entry.start_line == 2
    assert entry.start_column == 1

    assert entry.end_line == 2
    assert entry.end_column == 15

    entry = entries[1]
    assert entry.start_line == 3
    assert entry.start_column == 1

    assert entry.end_line == 3
    assert entry.end_column == 9


def test_lex_line_counting_multi_inner():
    """ Make sure we can do multi-line tokenization (inner) """
    entry = tokenize("""(foo
    bar)""")[0]
    inner = entry[0]

    assert inner.start_line == 1
    assert inner.start_column == 2

    inner = entry[1]

    assert inner.start_line == 2
    assert inner.start_column == 5


def test_dicts():
    """ Ensure that we can tokenize a dict. """
    objs = tokenize("{foo bar bar baz}")
    assert objs == [HyDict(["foo", "bar", "bar", "baz"])]

    objs = tokenize("(bar {foo bar bar baz})")
    assert objs == [HyExpression([HySymbol("bar"),
                                  HyDict(["foo", "bar",
                                          "bar", "baz"])])]

    objs = tokenize("{(foo bar) (baz quux)}")
    assert objs == [HyDict([
        HyExpression([HySymbol("foo"), HySymbol("bar")]),
        HyExpression([HySymbol("baz"), HySymbol("quux")])
    ])]


def test_nospace():
    """ Ensure we can tokenize without spaces if we have to """
    entry = tokenize("(foo(one two))")[0]

    assert entry.start_line == 1
    assert entry.start_column == 1

    assert entry.end_line == 1
    assert entry.end_column == 14

    entry = entry[1]
    assert entry.start_line == 1
    assert entry.start_column == 5

    assert entry.end_line == 1
    assert entry.end_column == 13


def test_escapes():
    """ Ensure we can escape things """
    entry = tokenize("(foo \"foo\\n\")")[0]
    assert entry[1] == "foo\n"

    entry = tokenize("(foo \"foo\s\")")[0]
    assert entry[1] == "foo\\s"


def test_unicode_escapes():
    """Ensure unicode escapes are handled correctly"""
    s = r'"a\xac\u1234\u20ac\U00008000"'
    assert len(s) == 29
    entry = tokenize(s)[0]
    assert len(entry) == 5
    assert [ord(x) for x in entry] == [97, 172, 4660, 8364, 32768]


def test_hashbang():
    """ Ensure we can escape things """
    entry = tokenize("#!this is a comment\n")
    assert entry == []


def test_complex():
    """Ensure we tokenize complex numbers properly"""
    # This is a regression test for #143
    entry = tokenize("(1j)")[0][0]
    assert entry == HyComplex("1.0j")
    entry = tokenize("(j)")[0][0]
    assert entry == HySymbol("j")


def test_reader_macro():
    """Ensure reader macros are handles properly"""
    entry = tokenize("#^()")
    assert entry[0][0] == HySymbol("dispatch_reader_macro")
    assert entry[0][1] == HyString("^")
    assert len(entry[0]) == 3


def test_lex_comment_382():
    """Ensure that we can tokenize sources with a comment at the end"""
    entry = tokenize("foo ;bar\n;baz")
    assert entry == [HySymbol("foo")]


def test_lex_mangling_star():
    """Ensure that mangling starred identifiers works according to plan"""
    entry = tokenize("*foo*")
    assert entry == [HySymbol("FOO")]
    entry = tokenize("*")
    assert entry == [HySymbol("*")]
    entry = tokenize("*foo")
    assert entry == [HySymbol("*foo")]


def test_lex_mangling_hyphen():
    """Ensure that hyphens get translated to underscores during mangling"""
    entry = tokenize("foo-bar")
    assert entry == [HySymbol("foo_bar")]
    entry = tokenize("-")
    assert entry == [HySymbol("-")]


def test_lex_mangling_qmark():
    """Ensure that identifiers ending with a question mark get mangled ok"""
    entry = tokenize("foo?")
    assert entry == [HySymbol("is_foo")]
    entry = tokenize("?")
    assert entry == [HySymbol("?")]
    entry = tokenize("im?foo")
    assert entry == [HySymbol("im?foo")]
    entry = tokenize(".foo?")
    assert entry == [HySymbol(".is_foo")]
    entry = tokenize("foo.bar?")
    assert entry == [HySymbol("foo.is_bar")]
    entry = tokenize("foo?.bar")
    assert entry == [HySymbol("is_foo.bar")]
    entry = tokenize(".foo?.bar.baz?")
    assert entry == [HySymbol(".is_foo.bar.is_baz")]