test_core_tags.py

# -*- coding: utf-8 -*-
"""
    jinja2.testsuite.core_tags
    ~~~~~~~~~~~~~~~~~~~~~~~~~~

    Test the core tags like for and if.

    :copyright: (c) 2017 by the Jinja Team.
    :license: BSD, see LICENSE for more details.
"""
import pytest
from jinja2 import Environment, TemplateSyntaxError, TemplateRuntimeError, \
     UndefinedError, DictLoader


@pytest.fixture
def env_trim():
    return Environment(trim_blocks=True)


@pytest.mark.core_tags
@pytest.mark.for_loop
class TestForLoop(object):

    def test_simple(self, env):
        tmpl = env.from_string('{% for item in seq %}{{ item }}{% endfor %}')
        assert tmpl.render(seq=list(range(10))) == '0123456789'

    def test_else(self, env):
        tmpl = env.from_string(
            '{% for item in seq %}XXX{% else %}...{% endfor %}')
        assert tmpl.render() == '...'

    def test_else_scoping_item(self, env):
        tmpl = env.from_string(
            '{% for item in [] %}{% else %}{{ item }}{% endfor %}')
        assert tmpl.render(item=42) == '42'

    def test_empty_blocks(self, env):
        tmpl = env.from_string('<{% for item in seq %}{% else %}{% endfor %}>')
        assert tmpl.render() == '<>'

    def test_context_vars(self, env):
        slist = [42, 24]
        for seq in [slist, iter(slist), reversed(slist), (_ for _ in slist)]:
            tmpl = env.from_string('''{% for item in seq -%}
            {{ loop.index }}|{{ loop.index0 }}|{{ loop.revindex }}|{{
                loop.revindex0 }}|{{ loop.first }}|{{ loop.last }}|{{
               loop.length }}###{% endfor %}''')
            one, two, _ = tmpl.render(seq=seq).split('###')
            (one_index, one_index0, one_revindex, one_revindex0, one_first,
             one_last, one_length) = one.split('|')
            (two_index, two_index0, two_revindex, two_revindex0, two_first,
             two_last, two_length) = two.split('|')

            assert int(one_index) == 1 and int(two_index) == 2
            assert int(one_index0) == 0 and int(two_index0) == 1
            assert int(one_revindex) == 2 and int(two_revindex) == 1
            assert int(one_revindex0) == 1 and int(two_revindex0) == 0
            assert one_first == 'True' and two_first == 'False'
            assert one_last == 'False' and two_last == 'True'
            assert one_length == two_length == '2'

    def test_cycling(self, env):
        tmpl = env.from_string('''{% for item in seq %}{{
            loop.cycle('<1>', '<2>') }}{% endfor %}{%
            for item in seq %}{{ loop.cycle(*through) }}{% endfor %}''')
        output = tmpl.render(seq=list(range(4)), through=('<1>', '<2>'))
        assert output == '<1><2>' * 4

    def test_lookaround(self, env):
        tmpl = env.from_string('''{% for item in seq -%}
            {{ loop.previtem|default('x') }}-{{ item }}-{{
            loop.nextitem|default('x') }}|
        {%- endfor %}''')
        output = tmpl.render(seq=list(range(4)))
        assert output == 'x-0-1|0-1-2|1-2-3|2-3-x|'

    def test_changed(self, env):
        tmpl = env.from_string('''{% for item in seq -%}
            {{ loop.changed(item) }},
        {%- endfor %}''')
        output = tmpl.render(seq=[None, None, 1, 2, 2, 3, 4, 4, 4])
        assert output == 'True,False,True,True,False,True,True,False,False,'

    def test_scope(self, env):
        tmpl = env.from_string('{% for item in seq %}{% endfor %}{{ item }}')
        output = tmpl.render(seq=list(range(10)))
        assert not output

    def test_varlen(self, env):
        def inner():
            for item in range(5):
                yield item
        tmpl = env.from_string('{% for item in iter %}{{ item }}{% endfor %}')
        output = tmpl.render(iter=inner())
        assert output == '01234'

    def test_noniter(self, env):
        tmpl = env.from_string('{% for item in none %}...{% endfor %}')
        pytest.raises(TypeError, tmpl.render)

    def test_recursive(self, env):
        tmpl = env.from_string('''{% for item in seq recursive -%}
            [{{ item.a }}{% if item.b %}<{{ loop(item.b) }}>{% endif %}]
        {%- endfor %}''')
        assert tmpl.render(seq=[
            dict(a=1, b=[dict(a=1), dict(a=2)]),
            dict(a=2, b=[dict(a=1), dict(a=2)]),
            dict(a=3, b=[dict(a='a')])
        ]) == '[1<[1][2]>][2<[1][2]>][3<[a]>]'

    def test_recursive_lookaround(self, env):
        tmpl = env.from_string('''{% for item in seq recursive -%}
            [{{ loop.previtem.a if loop.previtem is defined else 'x' }}.{{
            item.a }}.{{ loop.nextitem.a if loop.nextitem is defined else 'x'
            }}{% if item.b %}<{{ loop(item.b) }}>{% endif %}]
        {%- endfor %}''')
        assert tmpl.render(seq=[
            dict(a=1, b=[dict(a=1), dict(a=2)]),
            dict(a=2, b=[dict(a=1), dict(a=2)]),
            dict(a=3, b=[dict(a='a')])
        ]) == '[x.1.2<[x.1.2][1.2.x]>][1.2.3<[x.1.2][1.2.x]>][2.3.x<[x.a.x]>]'

    def test_recursive_depth0(self, env):
        tmpl = env.from_string('''{% for item in seq recursive -%}
            [{{ loop.depth0 }}:{{ item.a }}{% if item.b %}<{{ loop(item.b) }}>{% endif %}]
        {%- endfor %}''')
        assert tmpl.render(seq=[
            dict(a=1, b=[dict(a=1), dict(a=2)]),
            dict(a=2, b=[dict(a=1), dict(a=2)]),
            dict(a=3, b=[dict(a='a')])
        ]) == '[0:1<[1:1][1:2]>][0:2<[1:1][1:2]>][0:3<[1:a]>]'

    def test_recursive_depth(self, env):
        tmpl = env.from_string('''{% for item in seq recursive -%}
            [{{ loop.depth }}:{{ item.a }}{% if item.b %}<{{ loop(item.b) }}>{% endif %}]
        {%- endfor %}''')
        assert tmpl.render(seq=[
            dict(a=1, b=[dict(a=1), dict(a=2)]),
            dict(a=2, b=[dict(a=1), dict(a=2)]),
            dict(a=3, b=[dict(a='a')])
        ]) == '[1:1<[2:1][2:2]>][1:2<[2:1][2:2]>][1:3<[2:a]>]'

    def test_looploop(self, env):
        tmpl = env.from_string('''{% for row in table %}
            {%- set rowloop = loop -%}
            {% for cell in row -%}
                [{{ rowloop.index }}|{{ loop.index }}]
            {%- endfor %}
        {%- endfor %}''')
        assert tmpl.render(table=['ab', 'cd']) == '[1|1][1|2][2|1][2|2]'

    def test_reversed_bug(self, env):
        tmpl = env.from_string('{% for i in items %}{{ i }}'
                               '{% if not loop.last %}'
                               ',{% endif %}{% endfor %}')
        assert tmpl.render(items=reversed([3, 2, 1])) == '1,2,3'

    def test_loop_errors(self, env):
        tmpl = env.from_string('''{% for item in [1] if loop.index
                                      == 0 %}...{% endfor %}''')
        pytest.raises(UndefinedError, tmpl.render)
        tmpl = env.from_string('''{% for item in [] %}...{% else
            %}{{ loop }}{% endfor %}''')
        assert tmpl.render() == ''

    def test_loop_filter(self, env):
        tmpl = env.from_string('{% for item in range(10) if item '
                               'is even %}[{{ item }}]{% endfor %}')
        assert tmpl.render() == '[0][2][4][6][8]'
        tmpl = env.from_string('''
            {%- for item in range(10) if item is even %}[{{
                loop.index }}:{{ item }}]{% endfor %}''')
        assert tmpl.render() == '[1:0][2:2][3:4][4:6][5:8]'

    def test_loop_unassignable(self, env):
        pytest.raises(TemplateSyntaxError, env.from_string,
                      '{% for loop in seq %}...{% endfor %}')

    def test_scoped_special_var(self, env):
        t = env.from_string(
            '{% for s in seq %}[{{ loop.first }}{% for c in s %}'
            '|{{ loop.first }}{% endfor %}]{% endfor %}')
        assert t.render(seq=('ab', 'cd')) \
            == '[True|True|False][False|True|False]'

    def test_scoped_loop_var(self, env):
        t = env.from_string('{% for x in seq %}{{ loop.first }}'
                            '{% for y in seq %}{% endfor %}{% endfor %}')
        assert t.render(seq='ab') == 'TrueFalse'
        t = env.from_string('{% for x in seq %}{% for y in seq %}'
                            '{{ loop.first }}{% endfor %}{% endfor %}')
        assert t.render(seq='ab') == 'TrueFalseTrueFalse'

    def test_recursive_empty_loop_iter(self, env):
        t = env.from_string('''
        {%- for item in foo recursive -%}{%- endfor -%}
        ''')
        assert t.render(dict(foo=[])) == ''

    def test_call_in_loop(self, env):
        t = env.from_string('''
        {%- macro do_something() -%}
            [{{ caller() }}]
        {%- endmacro %}

        {%- for i in [1, 2, 3] %}
            {%- call do_something() -%}
                {{ i }}
            {%- endcall %}
        {%- endfor -%}
        ''')
        assert t.render() == '[1][2][3]'

    def test_scoping_bug(self, env):
        t = env.from_string('''
        {%- for item in foo %}...{{ item }}...{% endfor %}
        {%- macro item(a) %}...{{ a }}...{% endmacro %}
        {{- item(2) -}}
        ''')
        assert t.render(foo=(1,)) == '...1......2...'

    def test_unpacking(self, env):
        tmpl = env.from_string('{% for a, b, c in [[1, 2, 3]] %}'
                               '{{ a }}|{{ b }}|{{ c }}{% endfor %}')
        assert tmpl.render() == '1|2|3'

    def test_intended_scoping_with_set(self, env):
        tmpl = env.from_string('{% for item in seq %}{{ x }}'
                               '{% set x = item %}{{ x }}{% endfor %}')
        assert tmpl.render(x=0, seq=[1, 2, 3]) == '010203'

        tmpl = env.from_string('{% set x = 9 %}{% for item in seq %}{{ x }}'
                               '{% set x = item %}{{ x }}{% endfor %}')
        assert tmpl.render(x=0, seq=[1, 2, 3]) == '919293'


@pytest.mark.core_tags
@pytest.mark.if_condition
class TestIfCondition(object):

    def test_simple(self, env):
        tmpl = env.from_string('''{% if true %}...{% endif %}''')
        assert tmpl.render() == '...'

    def test_elif(self, env):
        tmpl = env.from_string('''{% if false %}XXX{% elif true
            %}...{% else %}XXX{% endif %}''')
        assert tmpl.render() == '...'

    def test_elif_deep(self, env):
        elifs = '\n'.join('{{% elif a == {0} %}}{0}'.format(i)
                          for i in range(1, 1000))
        tmpl = env.from_string('{{% if a == 0 %}}0{0}{{% else %}}x{{% endif %}}'
                               .format(elifs))
        for x in (0, 10, 999):
            assert tmpl.render(a=x).strip() == str(x)
        assert tmpl.render(a=1000).strip() == 'x'

    def test_else(self, env):
        tmpl = env.from_string('{% if false %}XXX{% else %}...{% endif %}')
        assert tmpl.render() == '...'

    def test_empty(self, env):
        tmpl = env.from_string('[{% if true %}{% else %}{% endif %}]')
        assert tmpl.render() == '[]'

    def test_complete(self, env):
        tmpl = env.from_string('{% if a %}A{% elif b %}B{% elif c == d %}'
                               'C{% else %}D{% endif %}')
        assert tmpl.render(a=0, b=False, c=42, d=42.0) == 'C'

    def test_no_scope(self, env):
        tmpl = env.from_string(
            '{% if a %}{% set foo = 1 %}{% endif %}{{ foo }}')
        assert tmpl.render(a=True) == '1'
        tmpl = env.from_string(
            '{% if true %}{% set foo = 1 %}{% endif %}{{ foo }}')
        assert tmpl.render() == '1'


@pytest.mark.core_tags
@pytest.mark.macros
class TestMacros(object):
    def test_simple(self, env_trim):
        tmpl = env_trim.from_string('''\
{% macro say_hello(name) %}Hello {{ name }}!{% endmacro %}
{{ say_hello('Peter') }}''')
        assert tmpl.render() == 'Hello Peter!'

    def test_scoping(self, env_trim):
        tmpl = env_trim.from_string('''\
{% macro level1(data1) %}
{% macro level2(data2) %}{{ data1 }}|{{ data2 }}{% endmacro %}
{{ level2('bar') }}{% endmacro %}
{{ level1('foo') }}''')
        assert tmpl.render() == 'foo|bar'

    def test_arguments(self, env_trim):
        tmpl = env_trim.from_string('''\
{% macro m(a, b, c='c', d='d') %}{{ a }}|{{ b }}|{{ c }}|{{ d }}{% endmacro %}
{{ m() }}|{{ m('a') }}|{{ m('a', 'b') }}|{{ m(1, 2, 3) }}''')
        assert tmpl.render() == '||c|d|a||c|d|a|b|c|d|1|2|3|d'

    def test_arguments_defaults_nonsense(self, env_trim):
        pytest.raises(TemplateSyntaxError, env_trim.from_string, '''\
{% macro m(a, b=1, c) %}a={{ a }}, b={{ b }}, c={{ c }}{% endmacro %}''')

    def test_caller_defaults_nonsense(self, env_trim):
        pytest.raises(TemplateSyntaxError, env_trim.from_string, '''\
{% macro a() %}{{ caller() }}{% endmacro %}
{% call(x, y=1, z) a() %}{% endcall %}''')

    def test_varargs(self, env_trim):
        tmpl = env_trim.from_string('''\
{% macro test() %}{{ varargs|join('|') }}{% endmacro %}\
{{ test(1, 2, 3) }}''')
        assert tmpl.render() == '1|2|3'

    def test_simple_call(self, env_trim):
        tmpl = env_trim.from_string('''\
{% macro test() %}[[{{ caller() }}]]{% endmacro %}\
{% call test() %}data{% endcall %}''')
        assert tmpl.render() == '[[data]]'

    def test_complex_call(self, env_trim):
        tmpl = env_trim.from_string('''\
{% macro test() %}[[{{ caller('data') }}]]{% endmacro %}\
{% call(data) test() %}{{ data }}{% endcall %}''')
        assert tmpl.render() == '[[data]]'

    def test_caller_undefined(self, env_trim):
        tmpl = env_trim.from_string('''\
{% set caller = 42 %}\
{% macro test() %}{{ caller is not defined }}{% endmacro %}\
{{ test() }}''')
        assert tmpl.render() == 'True'

    def test_include(self, env_trim):
        env_trim = Environment(
            loader=DictLoader({
                'include': '{% macro test(foo) %}[{{ foo }}]{% endmacro %}'
            })
        )
        tmpl = env_trim.from_string(
            '{% from "include" import test %}{{ test("foo") }}')
        assert tmpl.render() == '[foo]'

    def test_macro_api(self, env_trim):
        tmpl = env_trim.from_string(
            '{% macro foo(a, b) %}{% endmacro %}'
            '{% macro bar() %}{{ varargs }}{{ kwargs }}{% endmacro %}'
            '{% macro baz() %}{{ caller() }}{% endmacro %}')
        assert tmpl.module.foo.arguments == ('a', 'b')
        assert tmpl.module.foo.name == 'foo'
        assert not tmpl.module.foo.caller
        assert not tmpl.module.foo.catch_kwargs
        assert not tmpl.module.foo.catch_varargs
        assert tmpl.module.bar.arguments == ()
        assert not tmpl.module.bar.caller
        assert tmpl.module.bar.catch_kwargs
        assert tmpl.module.bar.catch_varargs
        assert tmpl.module.baz.caller

    def test_callself(self, env_trim):
        tmpl = env_trim.from_string('{% macro foo(x) %}{{ x }}{% if x > 1 %}|'
                                    '{{ foo(x - 1) }}{% endif %}{% endmacro %}'
                                    '{{ foo(5) }}')
        assert tmpl.render() == '5|4|3|2|1'

    def test_macro_defaults_self_ref(self, env):
        tmpl = env.from_string('''
            {%- set x = 42 %}
            {%- macro m(a, b=x, x=23) %}{{ a }}|{{ b }}|{{ x }}{% endmacro -%}
        ''')
        assert tmpl.module.m(1) == '1||23'
        assert tmpl.module.m(1, 2) == '1|2|23'
        assert tmpl.module.m(1, 2, 3) == '1|2|3'
        assert tmpl.module.m(1, x=7) == '1|7|7'


@pytest.mark.core_tags
@pytest.mark.set
class TestSet(object):

    def test_normal(self, env_trim):
        tmpl = env_trim.from_string('{% set foo = 1 %}{{ foo }}')
        assert tmpl.render() == '1'
        assert tmpl.module.foo == 1

    def test_block(self, env_trim):
        tmpl = env_trim.from_string('{% set foo %}42{% endset %}{{ foo }}')
        assert tmpl.render() == '42'
        assert tmpl.module.foo == u'42'

    def test_block_escaping(self):
        env = Environment(autoescape=True)
        tmpl = env.from_string('{% set foo %}<em>{{ test }}</em>'
                               '{% endset %}foo: {{ foo }}')
        assert tmpl.render(test='<unsafe>') == 'foo: <em>&lt;unsafe&gt;</em>'

    def test_set_invalid(self, env_trim):
        pytest.raises(TemplateSyntaxError, env_trim.from_string,
                      "{% set foo['bar'] = 1 %}")
        tmpl = env_trim.from_string('{% set foo.bar = 1 %}')
        exc_info = pytest.raises(TemplateRuntimeError, tmpl.render, foo={})
        assert 'non-namespace object' in exc_info.value.message

    def test_namespace_redefined(self, env_trim):
        tmpl = env_trim.from_string('{% set ns = namespace() %}'
                                    '{% set ns.bar = "hi" %}')
        exc_info = pytest.raises(TemplateRuntimeError, tmpl.render,
                                 namespace=dict)
        assert 'non-namespace object' in exc_info.value.message

    def test_namespace(self, env_trim):
        tmpl = env_trim.from_string('{% set ns = namespace() %}'
                                    '{% set ns.bar = "42" %}'
                                    '{{ ns.bar }}')
        assert tmpl.render() == '42'

    def test_namespace_block(self, env_trim):
        tmpl = env_trim.from_string('{% set ns = namespace() %}'
                                    '{% set ns.bar %}42{% endset %}'
                                    '{{ ns.bar }}')
        assert tmpl.render() == '42'

    def test_init_namespace(self, env_trim):
        tmpl = env_trim.from_string('{% set ns = namespace(d, self=37) %}'
                                    '{% set ns.b = 42 %}'
                                    '{{ ns.a }}|{{ ns.self }}|{{ ns.b }}')
        assert tmpl.render(d={'a': 13}) == '13|37|42'

    def test_namespace_loop(self, env_trim):
        tmpl = env_trim.from_string('{% set ns = namespace(found=false) %}'
                                    '{% for x in range(4) %}'
                                    '{% if x == v %}'
                                    '{% set ns.found = true %}'
                                    '{% endif %}'
                                    '{% endfor %}'
                                    '{{ ns.found }}')
        assert tmpl.render(v=3) == 'True'
        assert tmpl.render(v=4) == 'False'

    def test_namespace_macro(self, env_trim):
        tmpl = env_trim.from_string('{% set ns = namespace() %}'
                                    '{% set ns.a = 13 %}'
                                    '{% macro magic(x) %}'
                                    '{% set x.b = 37 %}'
                                    '{% endmacro %}'
                                    '{{ magic(ns) }}'
                                    '{{ ns.a }}|{{ ns.b }}')
        assert tmpl.render() == '13|37'


@pytest.mark.core_tags
@pytest.mark.with_
class TestWith(object):

    def test_with(self, env):
        tmpl = env.from_string('''\
        {% with a=42, b=23 -%}
            {{ a }} = {{ b }}
        {% endwith -%}
            {{ a }} = {{ b }}\
        ''')
        assert [x.strip() for x in tmpl.render(a=1, b=2).splitlines()] \
            == ['42 = 23', '1 = 2']

    def test_with_argument_scoping(self, env):
        tmpl = env.from_string('''\
        {%- with a=1, b=2, c=b, d=e, e=5 -%}
            {{ a }}|{{ b }}|{{ c }}|{{ d }}|{{ e }}
        {%- endwith -%}
        ''')
        assert tmpl.render(b=3, e=4) == '1|2|3|4|5'