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# Copyright (c) 2004-2008 Divmod.
# See LICENSE for details.

"""
Tests for parts of L{nevow.loaders}.
"""

from twisted.internet import defer

from nevow import context
from nevow import flat
from nevow import rend
from nevow import testutil
from nevow import loaders
from nevow import util
from nevow import tags

def deferredRender(res):
    defres = testutil.FakeRequest()
    d = res.renderHTTP(context.PageContext(tag=res, parent=context.RequestContext(tag=defres)))
    def accumulated(result, req):
        return req.accumulator
    return d.addCallback(accumulated, defres)


def setContent(name, content):
    """
    Write C{content} to the file named C{name}.
    """
    # If an exception is raised, the file will eventually be garbage
    # collected.  It doesn't really matter how long that takes, since if an
    # exception is raised, no code is going to try to use the contents of
    # the file.  So, don't bother making extra sure it gets closed.
    fObj = file(name, 'w')
    fObj.write(content)
    fObj.close()


class TestHTMLRenderer(testutil.TestCase):
    
    '''Test basic rendering behaviour'''

    xhtml = '''<html><head><title>Test</title></head><body><p>Hello!</p></body></html>'''

    def test_stringTemplate(self):
        r = rend.Page(docFactory=loaders.htmlstr(self.xhtml))
        return deferredRender(r).addCallback(
            lambda result: self.assertEquals(result, self.xhtml))

    def test_diskTemplate(self):
        temp = self.mktemp()
        setContent(temp, self.xhtml)
        r = rend.Page(docFactory=loaders.htmlfile(temp))
        return deferredRender(r).addCallback(
            lambda result: self.assertEquals(result, self.xhtml))


class TestStandardRenderers(testutil.TestCase):

    def test_diskTemplate(self):
        temp = self.mktemp()
        setContent(temp, """<html>
    <head>
        <title nevow:data="theTitle" nevow:render="string">This is some template data!</title>
    </head>
    <body>
        <h3 nevow:data="theHead" nevow:render="string">This is a header</h3>
        <span nevow:data="someDummyText" nevow:render="replaceNode">This node will be replaced entirely (including the span)</span>
    </body>
</html>""")

        class TemplateRenderer(rend.Page):
            def data_theTitle(self, context, data):
                return "THE TITLE"

            def data_theHead(self, context, data):
                return "THE HEADER"

            def data_someDummyText(self, context, data):
                return "SOME DUMMY TEXT"

            def render_string(self, context, data):
                """The rule is, whatever a renderer returns *replaces* the node that came in
                so if we want this data to *fill* the node the directive was on, we have to
                do it explicitly
                """
                ## This could also be written as:
                # return context.tag.clear()[ data ]
                ## choose your poison
                tag = context.tag.clear()
                tag.children.append(data)
                return tag

            def render_replaceNode(self, context, data):
                """Render the current node by replacing whatever was there (including the
                node itself) with the current data.
                """
                return data

        tr = TemplateRenderer(docFactory=loaders.htmlfile(temp))

        return deferredRender(tr).addCallback(
            lambda result: self.assertEquals(
            result,
            '<html><head><title>THE TITLE</title></head><body><h3>THE HEADER</h3>SOME DUMMY TEXT</body></html>'
            ))

    def test_sequence(self):
        """Test case provided by mg
        """
        temp = self.mktemp()
        setContent(temp, """<ol nevow:data="aList" nevow:render="sequence"><li nevow:pattern="item" nevow:render="string"></li></ol>""")

        class TemplateRenderer(rend.Page):
            def data_aList(self,context,data):
                return ["one","two","three"]

        tr = TemplateRenderer(docFactory=loaders.htmlfile(temp))

        return deferredRender(tr).addCallback(
            lambda result:
            self.assertEquals(
            result, '<ol><li>one</li><li>two</li><li>three</li></ol>',
            "Whoops. We didn't get what we expected!"
            ))

    def test_sequence2(self):
        """Test case provided by radix
        """
        temp = self.mktemp()
        setContent(temp, """<ol nevow:data="aList" nevow:render="sequence"><li nevow:pattern="item"><span nevow:render="string" /></li></ol>""")

        class TemplateRenderer(rend.Page):
            def data_aList(self,context,data):
                return ["one","two","three"]

        tr = TemplateRenderer(docFactory=loaders.htmlfile(temp))

        return deferredRender(tr).addCallback(
            lambda result:
            self.assertEquals(
            result, '<ol><li><span>one</span></li><li><span>two</span></li><li><span>three</span></li></ol>',
            "Whoops. We didn't get what we expected!"
            ))


    def test_slots(self):
        """test case provided by mg! thanks
        """
        temp = self.mktemp()
        setContent(temp, """
        <table nevow:data="aDict" nevow:render="slots">
        <tr><td><nevow:slot name="1" /></td><td><nevow:slot name="2" /></td></tr>
        <tr><td><nevow:slot name="3" /></td><td><nevow:slot name="4" /></td></tr>
        </table>""")
    
        class Renderer(rend.Page):
            def data_aDict(self,context,data):
                return {'1':'one','2':'two','3':'three','4':'four'}
            def render_slots(self,context,data):
                for name,value in data.items():
                    context.fillSlots(name, value)
                return context.tag

        return deferredRender(Renderer(docFactory=loaders.htmlfile(temp))).addCallback(
            lambda result:
            self.assertEquals(
            result,
            "<table><tr><td>one</td><td>two</td></tr><tr><td>three</td><td>four</td></tr></table>",
            "Whoops. We didn't get what we expected!"))

    def test_patterns(self):
        temp = self.mktemp()
        setContent(temp, """<span nevow:render="foo">
            <span nevow:pattern="one">ONE</span>
            <span nevow:pattern="two">TWO</span>
            <span nevow:pattern="three">THREE</span>
        </span>""")

        class Mine(rend.Page):
            def render_foo(self, context, data):
                return context.tag.allPatterns(data)

        return defer.DeferredList([
            deferredRender(Mine("one", docFactory=loaders.htmlfile(temp))).addCallback(
            lambda result: self.assertEquals(result, '<span>ONE</span>')),
            deferredRender(Mine("two", docFactory=loaders.htmlfile(temp))).addCallback(
            lambda result: self.assertEquals(result, '<span>TWO</span>')),
            deferredRender(Mine("three", docFactory=loaders.htmlfile(temp))).addCallback(
            lambda result: self.assertEquals(result, '<span>THREE</span>'))
            ], fireOnOneErrback=True)



class TestSubclassAsRenderAndDataFactory(testutil.TestCase):
    def test_rendererSubclass(self):
        from nevow import tags
        class Subclass(rend.Page):
            docFactory = loaders.stan(tags.html[
                tags.div(data=tags.directive("hello"))[
                    str
                ],
                tags.span(render=tags.directive("world"))
            ])
            def data_hello(self, context, data):
                self.helloCalled = True
                return "hello"
    
            def render_world(self, context, data):
                return "world"

        sr = Subclass()
        D = deferredRender(sr)
        def after(result):
            self.assertSubstring('hello', result)
            self.assertSubstring('world', result)
            self.assertEquals(result,
                              "<html><div>hello</div>world</html>")
        return D.addCallback(after)


class TestXmlFileWithSlots(testutil.TestCase):
    def test_slotWithCharacterData(self):
        """Test that xml templates with slots that contain content can be
        loaded"""
        template = '<p xmlns:nevow="http://nevow.com/ns/nevow/0.1"><nevow:slot name="foo">stuff</nevow:slot></p>'
        doc = loaders.xmlstr(template).load()



class TestAttrReplacement(testutil.TestCase):
    """
    Test the replacement of an attribute in an HTML or XML document using slot
    or attr elements.
    """
    def testXML(self):
        t = '<a xmlns:n="http://nevow.com/ns/nevow/0.1" href="#"><n:attr name="href">href</n:attr>label</a>'
        result = flat.flatten(loaders.xmlstr(t).load())
        self.assertEqual(result, '<a href="href">label</a>')
        t = '<a xmlns:n="http://nevow.com/ns/nevow/0.1" href="#"><n:attr name="href"><n:slot name="href"/></n:attr>label</a>'
        precompiled = loaders.xmlstr(t).load()
        ctx = context.WovenContext(tag=tags.invisible[precompiled])
        ctx.fillSlots('href', 'href')
        result = flat.flatten(precompiled, ctx)
        self.assertEqual(result, '<a href="href">label</a>')


    def testHTML(self):
        t = '<a href="#"><nevow:attr name="href">href</nevow:attr>label</a>'
        doc = flat.flatten(loaders.htmlstr(t).load())
        self.assertEqual(doc, '<a href="href">label</a>')
        t = '<a href="#"><nevow:attr name="href"><nevow:slot name="href"/></nevow:attr>label</a>'
        precompiled = loaders.htmlstr(t).load()
        ctx = context.WovenContext(tag=tags.invisible[precompiled])
        ctx.fillSlots('href', 'href')
        result = flat.flatten(precompiled, ctx)
        self.assertEqual(result, '<a href="href">label</a>')

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