import pprint

import re

import unittest

from test import test_support

sgmllib = test_support.import_module('sgmllib', deprecated=True)

class EventCollector(sgmllib.SGMLParser):

    def __init__(self):

        self.events = []

        self.append = self.events.append

        sgmllib.SGMLParser.__init__(self)

    def get_events(self):

        # Normalize the list of events so that buffer artefacts don't

        # separate runs of contiguous characters.

        L = []

        prevtype = None

        for event in self.events:

            type = event[0]

            if type == prevtype == "data":

                L[-1] = ("data", L[-1][1] + event[1])

            else:

                L.append(event)

            prevtype = type

        self.events = L

        return L

    # structure markup

    def unknown_starttag(self, tag, attrs):

        self.append(("starttag", tag, attrs))

    def unknown_endtag(self, tag):

        self.append(("endtag", tag))

    # all other markup

    def handle_comment(self, data):

        self.append(("comment", data))

    def handle_charref(self, data):

        self.append(("charref", data))

    def handle_data(self, data):

        self.append(("data", data))

    def handle_decl(self, decl):

        self.append(("decl", decl))

    def handle_entityref(self, data):

        self.append(("entityref", data))

    def handle_pi(self, data):

        self.append(("pi", data))

    def unknown_decl(self, decl):

        self.append(("unknown decl", decl))

class CDATAEventCollector(EventCollector):

    def start_cdata(self, attrs):

        self.append(("starttag", "cdata", attrs))

        self.setliteral()

class HTMLEntityCollector(EventCollector):

    entity_or_charref = re.compile('(?:&([a-zA-Z][-.a-zA-Z0-9]*)'

        '|&#(x[0-9a-zA-Z]+|[0-9]+))(;?)')

    def convert_charref(self, name):

        self.append(("charref", "convert", name))

        if name[0] != "x":

            return EventCollector.convert_charref(self, name)

    def convert_codepoint(self, codepoint):

        self.append(("codepoint", "convert", codepoint))

        EventCollector.convert_codepoint(self, codepoint)

    def convert_entityref(self, name):

        self.append(("entityref", "convert", name))

        return EventCollector.convert_entityref(self, name)

    # These to record that they were called, then pass the call along

    # to the default implementation so that it's actions can be

    # recorded.

    def handle_charref(self, data):

        self.append(("charref", data))

        sgmllib.SGMLParser.handle_charref(self, data)

    def handle_entityref(self, data):

        self.append(("entityref", data))

        sgmllib.SGMLParser.handle_entityref(self, data)

class SGMLParserTestCase(unittest.TestCase):

    collector = EventCollector

    def get_events(self, source):

        parser = self.collector()

        try:

            for s in source:

                parser.feed(s)

            parser.close()

        except:

            #self.events = parser.events

            raise

        return parser.get_events()

    def check_events(self, source, expected_events):

        try:

            events = self.get_events(source)

        except:

            #import sys

            #print >>sys.stderr, pprint.pformat(self.events)

            raise

        if events != expected_events:

            self.fail("received events did not match expected events\n"

                      "Expected:\n" + pprint.pformat(expected_events) +

                      "\nReceived:\n" + pprint.pformat(events))

    def check_parse_error(self, source):

        parser = EventCollector()

        try:

            parser.feed(source)

            parser.close()

        except sgmllib.SGMLParseError:

            pass

        else:

            self.fail("expected SGMLParseError for %r\nReceived:\n%s"

                      % (source, pprint.pformat(parser.get_events())))

    def test_doctype_decl_internal(self):

        inside = """\

DOCTYPE html PUBLIC '-//W3C//DTD HTML 4.01//EN'

             SYSTEM 'http://www.w3.org/TR/html401/strict.dtd' [

  <!ELEMENT html - O EMPTY>

  <!ATTLIST html

      version CDATA #IMPLIED

      profile CDATA 'DublinCore'>

  <!NOTATION datatype SYSTEM 'http://xml.python.org/notations/python-module'>

  <!ENTITY myEntity 'internal parsed entity'>

  <!ENTITY anEntity SYSTEM 'http://xml.python.org/entities/something.xml'>

  <!ENTITY % paramEntity 'name|name|name'>

  %paramEntity;

  <!-- comment -->

]"""

        self.check_events(["<!%s>" % inside], [

            ("decl", inside),

            ])

    def test_doctype_decl_external(self):

        inside = "DOCTYPE html PUBLIC '-//W3C//DTD HTML 4.01//EN'"

        self.check_events("<!%s>" % inside, [

            ("decl", inside),

            ])

    def test_underscore_in_attrname(self):

        # SF bug #436621

        """Make sure attribute names with underscores are accepted"""

        self.check_events("<a has_under _under>", [

            ("starttag", "a", [("has_under", "has_under"),

                               ("_under", "_under")]),

            ])

    def test_underscore_in_tagname(self):

        # SF bug #436621

        """Make sure tag names with underscores are accepted"""

        self.check_events("<has_under></has_under>", [

            ("starttag", "has_under", []),

            ("endtag", "has_under"),

            ])

    def test_quotes_in_unquoted_attrs(self):

        # SF bug #436621

        """Be sure quotes in unquoted attributes are made part of the value"""

        self.check_events("<a href=foo'bar\"baz>", [

            ("starttag", "a", [("href", "foo'bar\"baz")]),

            ])

    def test_xhtml_empty_tag(self):

        """Handling of XHTML-style empty start tags"""

        self.check_events("<br />text<i></i>", [

            ("starttag", "br", []),

            ("data", "text"),

            ("starttag", "i", []),

            ("endtag", "i"),

            ])

    def test_processing_instruction_only(self):

        self.check_events("<?processing instruction>", [

            ("pi", "processing instruction"),

            ])

    def test_bad_nesting(self):

        self.check_events("<a><b></a></b>", [

            ("starttag", "a", []),

            ("starttag", "b", []),

            ("endtag", "a"),

            ("endtag", "b"),

            ])

    def test_bare_ampersands(self):

        self.check_events("this text & contains & ampersands &", [

            ("data", "this text & contains & ampersands &"),

            ])

    def test_bare_pointy_brackets(self):

        self.check_events("this < text > contains < bare>pointy< brackets", [

            ("data", "this < text > contains < bare>pointy< brackets"),

            ])

    def test_attr_syntax(self):

        output = [

          ("starttag", "a", [("b", "v"), ("c", "v"), ("d", "v"), ("e", "e")])

          ]

        self.check_events("""<a b='v' c="v" d=v e>""", output)

        self.check_events("""<a  b = 'v' c = "v" d = v e>""", output)

        self.check_events("""<a\nb\n=\n'v'\nc\n=\n"v"\nd\n=\nv\ne>""", output)

        self.check_events("""<a\tb\t=\t'v'\tc\t=\t"v"\td\t=\tv\te>""", output)

    def test_attr_values(self):

        self.check_events("""<a b='xxx\n\txxx' c="yyy\t\nyyy" d='\txyz\n'>""",

                        [("starttag", "a", [("b", "xxx\n\txxx"),

                                            ("c", "yyy\t\nyyy"),

                                            ("d", "\txyz\n")])

                         ])

        self.check_events("""<a b='' c="">""", [

            ("starttag", "a", [("b", ""), ("c", "")]),

            ])

        # URL construction stuff from RFC 1808:

        safe = "$-_.+"

        extra = "!*'(),"

        reserved = ";/?:@&="

        url = "http://example.com:8080/path/to/file?%s%s%s" % (

            safe, extra, reserved)

        self.check_events("""<e a=%s>""" % url, [

            ("starttag", "e", [("a", url)]),

            ])

        # Regression test for SF patch #669683.

        self.check_events("<e a=rgb(1,2,3)>", [

            ("starttag", "e", [("a", "rgb(1,2,3)")]),

            ])

    def test_attr_values_entities(self):

        """Substitution of entities and charrefs in attribute values"""

        # SF bug #1452246

        self.check_events("""<a b=&lt; c=&lt;&gt; d=&lt-&gt; e='&lt; '

                                f="&xxx;" g=' !' h='Ǵ'

                                i='x?a=b&c=d;'

                                j='*' k='*'>""",

            [("starttag", "a", [("b", "<"),

                                ("c", "<>"),

                                ("d", "&lt->"),

                                ("e", "< "),

                                ("f", "&xxx;"),

                                ("g", " !"),

                                ("h", "Ǵ"),

                                ("i", "x?a=b&c=d;"),

                                ("j", "*"),

                                ("k", "*"),

                                ])])

    def test_convert_overrides(self):

        # This checks that the character and entity reference

        # conversion helpers are called at the documented times.  No

        # attempt is made to really change what the parser accepts.

        #

        self.collector = HTMLEntityCollector

        self.check_events(('<a title="&ldquo;test&#x201d;">foo</a>'

                           '&foobar;*'), [

            ('entityref', 'convert', 'ldquo'),

            ('charref', 'convert', 'x201d'),

            ('starttag', 'a', [('title', '“test”')]),

            ('data', 'foo'),

            ('endtag', 'a'),

            ('entityref', 'foobar'),

            ('entityref', 'convert', 'foobar'),

            ('charref', '42'),

            ('charref', 'convert', '42'),

            ('codepoint', 'convert', 42),

            ])

    def test_attr_funky_names(self):

        self.check_events("""<a a.b='v' c:d=v e-f=v>""", [

            ("starttag", "a", [("a.b", "v"), ("c:d", "v"), ("e-f", "v")]),

            ])

    def test_attr_value_ip6_url(self):

        # http://www.python.org/sf/853506

        self.check_events(("<a href='http://[1080::8:800:200C:417A]/'>"

                           "<a href=http://[1080::8:800:200C:417A]/>"), [

            ("starttag", "a", [("href", "http://[1080::8:800:200C:417A]/")]),

            ("starttag", "a", [("href", "http://[1080::8:800:200C:417A]/")]),

            ])

    def test_illegal_declarations(self):

        s = 'abc<!spacer type="block" height="25">def'

        self.check_events(s, [

            ("data", "abc"),

            ("unknown decl", 'spacer type="block" height="25"'),

            ("data", "def"),

            ])

    def test_weird_starttags(self):

        self.check_events("<a<a>", [

            ("starttag", "a", []),

            ("starttag", "a", []),

            ])

        self.check_events("</a<a>", [

            ("endtag", "a"),

            ("starttag", "a", []),

            ])

    def test_declaration_junk_chars(self):

        self.check_parse_error("<!DOCTYPE foo $ >")

    def test_get_starttag_text(self):

        s = """<foobar   \n   one="1"\ttwo=2   >"""

        self.check_events(s, [

            ("starttag", "foobar", [("one", "1"), ("two", "2")]),

            ])

    def test_cdata_content(self):

        s = ("<cdata> <!-- not a comment --> &not-an-entity-ref; </cdata>"

             "<notcdata> <!-- comment --> </notcdata>")

        self.collector = CDATAEventCollector

        self.check_events(s, [

            ("starttag", "cdata", []),

            ("data", " <!-- not a comment --> &not-an-entity-ref; "),

            ("endtag", "cdata"),

            ("starttag", "notcdata", []),

            ("data", " "),

            ("comment", " comment "),

            ("data", " "),

            ("endtag", "notcdata"),

            ])

        s = """<cdata> <not a='start tag'> </cdata>"""

        self.check_events(s, [

            ("starttag", "cdata", []),

            ("data", " <not a='start tag'> "),

            ("endtag", "cdata"),

            ])

    def test_illegal_declarations(self):

        s = 'abc<!spacer type="block" height="25">def'

        self.check_events(s, [

            ("data", "abc"),

            ("unknown decl", 'spacer type="block" height="25"'),

            ("data", "def"),

            ])

    def test_enumerated_attr_type(self):

        s = "<!DOCTYPE doc [<!ATTLIST doc attr (a | b) >]>"

        self.check_events(s, [

            ('decl', 'DOCTYPE doc [<!ATTLIST doc attr (a | b) >]'),

            ])

    def test_read_chunks(self):

        # SF bug #1541697, this caused sgml parser to hang

        # Just verify this code doesn't cause a hang.

        CHUNK = 1024  # increasing this to 8212 makes the problem go away

        f = open(test_support.findfile('sgml_input.html'))

        fp = sgmllib.SGMLParser()

        while 1:

            data = f.read(CHUNK)

            fp.feed(data)

            if len(data) != CHUNK:

                break

    # XXX These tests have been disabled by prefixing their names with

    # an underscore.  The first two exercise outstanding bugs in the

    # sgmllib module, and the third exhibits questionable behavior

    # that needs to be carefully considered before changing it.

    def _test_starttag_end_boundary(self):

        self.check_events("<a b='<'>", [("starttag", "a", [("b", "<")])])

        self.check_events("<a b='>'>", [("starttag", "a", [("b", ">")])])

    def _test_buffer_artefacts(self):

        output = [("starttag", "a", [("b", "<")])]

        self.check_events(["<a b='<'>"], output)

        self.check_events(["<a ", "b='<'>"], output)

        self.check_events(["<a b", "='<'>"], output)

        self.check_events(["<a b=", "'<'>"], output)

        self.check_events(["<a b='<", "'>"], output)

        self.check_events(["<a b='<'", ">"], output)

        output = [("starttag", "a", [("b", ">")])]

        self.check_events(["<a b='>'>"], output)

        self.check_events(["<a ", "b='>'>"], output)

        self.check_events(["<a b", "='>'>"], output)

        self.check_events(["<a b=", "'>'>"], output)

        self.check_events(["<a b='>", "'>"], output)

        self.check_events(["<a b='>'", ">"], output)

        output = [("comment", "abc")]

        self.check_events(["", "<!--abc-->"], output)

        self.check_events(["<", "!--abc-->"], output)

        self.check_events(["<!", "--abc-->"], output)

        self.check_events(["<!-", "-abc-->"], output)

        self.check_events(["<!--", "abc-->"], output)

        self.check_events(["<!--a", "bc-->"], output)

        self.check_events(["<!--ab", "c-->"], output)

        self.check_events(["<!--abc", "-->"], output)

        self.check_events(["<!--abc-", "->"], output)

        self.check_events(["<!--abc--", ">"], output)

        self.check_events(["<!--abc-->", ""], output)

    def _test_starttag_junk_chars(self):

        self.check_parse_error("<")

        self.check_parse_error("<>")

        self.check_parse_error("</$>")

        self.check_parse_error("</")

        self.check_parse_error("</a")

        self.check_parse_error("<$")

        self.check_parse_error("<$>")

        self.check_parse_error("<!")

        self.check_parse_error("<a $>")

        self.check_parse_error("<a")

        self.check_parse_error("<a foo='bar'")

        self.check_parse_error("<a foo='bar")

        self.check_parse_error("<a foo='>'")

        self.check_parse_error("<a foo='>")

        self.check_parse_error("<a foo=>")

def test_main():

    test_support.run_unittest(SGMLParserTestCase)

if __name__ == "__main__":

    test_main()