#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
# Copyright (c), 2016-2019, SISSA (International School for Advanced Studies).
# All rights reserved.
# This file is distributed under the terms of the MIT License.
# See the file 'LICENSE' in the root directory of the present
# distribution, or http://opensource.org/licenses/MIT.
#
# @author Davide Brunato <brunato@sissa.it>
#
"""
This module runs tests concerning model groups validation.
"""
import unittest

from xmlschema import XMLSchema10, XMLSchema11
from xmlschema.validators import ModelVisitor
from xmlschema.compat import ordered_dict_class
from xmlschema.tests import casepath, XsdValidatorTestCase


class TestModelValidation(XsdValidatorTestCase):

    # --- Test helper functions ---

    def check_advance_true(self, model, expected=None):
        """
        Advances a model with a match condition and checks the expected error list or exception.

        :param model: an ModelGroupVisitor instance.
        :param expected: can be an exception class or a list. Leaving `None` means that an empty \
        list is expected.
        """
        if isinstance(expected, type) and issubclass(expected, Exception):
            self.assertRaises(expected, lambda x: list(model.advance(x)), True)
        else:
            self.assertEqual([e for e in model.advance(True)], expected or [])

    def check_advance_false(self, model, expected=None):
        """
        Advances a model with a no-match condition and checks the expected error list or  or exception.

        :param model: an ModelGroupVisitor instance.
        :param expected: can be an exception class or a list. Leaving `None` means that an empty \
        list is expected.
        """
        if isinstance(expected, type) and issubclass(expected, Exception):
            self.assertRaises(expected, lambda x: list(model.advance(x)), False)
        else:
            self.assertEqual([e for e in model.advance(False)], expected or [])

    def check_advance(self, model, match, expected=None):
        """
        Advances a model with an argument match condition and checks the expected error list.

        :param model: an ModelGroupVisitor instance.
        :param match: the matching boolean condition.
        :param expected: can be an exception class or a list. Leaving `None` means that an empty \
        list is expected.
        """
        if isinstance(expected, type) and issubclass(expected, Exception):
            self.assertRaises(expected, lambda x: list(model.advance(x)), match)
        else:
            self.assertEqual([e for e in model.advance(match)], expected or [])

    def check_stop(self, model, expected=None):
        """
        Stops a model and checks the expected errors list.

        :param model: an ModelGroupVisitor instance.
        :param expected: can be an exception class or a list. Leaving `None` means that an empty \
        list is expected.
        """
        if isinstance(expected, type) and issubclass(expected, Exception):
            self.assertRaises(expected, lambda: list(model.stop()))
        else:
            self.assertEqual([e for e in model.stop()], expected or [])

    # --- Vehicles schema ---

    def test_vehicles_model(self):
        # Sequence with two not-emptiable single-occurs elements
        group = self.vh_schema.elements['vehicles'].type.content_type

        model = ModelVisitor(group)
        self.check_advance_true(model)                # <cars>
        self.check_advance_true(model)                # <bikes>
        self.assertIsNone(model.element)

        model = ModelVisitor(group)
        self.check_advance_true(model)                # <cars>
        self.check_advance_true(model)                # <bikes>
        self.check_advance_true(model, ValueError)    # <bikes>
        self.assertIsNone(model.element)

    def test_cars_model(self):
        # Emptiable 1:1 sequence with one emptiable and unlimited element.
        group = self.vh_schema.elements['cars'].type.content_type

        model = ModelVisitor(group)
        self.check_advance_true(model)     # <car>
        self.check_advance_true(model)     # <car>
        self.check_advance_true(model)     # <car>
        self.check_advance_false(model)    # (end)
        self.assertIsNone(model.element)

        model = ModelVisitor(group)
        self.check_advance_false(model)    # <not-a-car>
        self.assertIsNone(model.element)

    # --- Collection schema ---

    def test_collection_model(self):
        # Sequence with one not-emptiable and unlimited element.
        group = self.col_schema.elements['collection'].type.content_type

        model = ModelVisitor(group)
        self.check_advance_true(model)     # <car>
        self.check_advance_true(model)     # <car>
        self.check_advance_true(model)     # <car>
        self.check_advance_true(model)     # <car>
        self.check_advance_false(model)    # (end)
        self.assertIsNone(model.element)

        model = ModelVisitor(group)
        self.check_advance_false(model, [(group[0], 0, [group[0]])])  # <not-a-car>
        self.assertIsNone(model.element)

    def test_person_type_model(self):
        # Sequence with four single elements, last two are also emptiable.
        group = self.col_schema.types['personType'].content_type

        model = ModelVisitor(group)
        self.check_advance_true(model)     # <name>
        self.check_advance_true(model)     # <born>
        self.check_advance_true(model)     # <dead>
        self.check_advance_true(model)     # <qualification>
        self.assertIsNone(model.element)

        model = ModelVisitor(group)
        self.check_advance_true(model)     # <name>
        self.check_advance_true(model)     # <born>
        self.check_stop(model)
        self.assertIsNone(model.element)

        model = ModelVisitor(group)
        self.check_advance_true(model)                                # <name> match
        self.check_advance_false(model, [(group[1], 0, [group[1]])])  # <born> missing!
        self.check_advance_true(model)                                # <dead> match
        self.check_stop(model)                                        # <qualification> is optional
        self.assertIsNone(model.element)

    # --- XSD 1.0/1.1 meta-schema models ---

    def test_meta_simple_derivation_model(self):
        """
        <xs:group name="simpleDerivation">
          <xs:choice>
            <xs:element ref="xs:restriction"/>
            <xs:element ref="xs:list"/>
            <xs:element ref="xs:union"/>
          </xs:choice>
        </xs:group>
        """
        group = XMLSchema10.meta_schema.groups['simpleDerivation']

        model = ModelVisitor(group)
        self.check_advance_true(model)     # <restriction> match
        self.assertIsNone(model.element)

        model = ModelVisitor(group)
        self.check_advance_false(model)    # <list> not match with <restriction>
        self.check_advance_true(model)     # <list> match
        self.assertIsNone(model.element)

        model = ModelVisitor(group)
        self.check_advance_false(model)    # <union> not match with <restriction>
        self.check_advance_false(model)    # <union> not match with <list>
        self.check_advance_true(model)     # <union> match
        self.assertIsNone(model.element)

        model = ModelVisitor(group)
        self.check_advance_false(model)                          # <other> not match with <restriction>
        self.check_advance_false(model)                          # <other> not match with <list>
        self.check_advance_false(model, [(group, 0, group[:])])  # <other> not match with <union>
        self.assertIsNone(model.element)

    def test_meta_simple_restriction_model(self):
        """
        <!-- XSD 1.0 -->
        <xs:group name="facets">
          <xs:choice>
            <xs:element ref="xs:minExclusive"/>
            <xs:element ref="xs:minInclusive"/>
            <xs:element ref="xs:maxExclusive"/>
            <xs:element ref="xs:maxInclusive"/>
            <xs:element ref="xs:totalDigits"/>
            <xs:element ref="xs:fractionDigits"/>
            <xs:element ref="xs:length"/>
            <xs:element ref="xs:minLength"/>
            <xs:element ref="xs:maxLength"/>
            <xs:element ref="xs:enumeration"/>
            <xs:element ref="xs:whiteSpace"/>
            <xs:element ref="xs:pattern"/>
          </xs:choice>
        </xs:group>

        <xs:group name="simpleRestrictionModel">
          <xs:sequence>
            <xs:element name="simpleType" type="xs:localSimpleType" minOccurs="0"/>
            <xs:group ref="xs:facets" minOccurs="0" maxOccurs="unbounded"/>
          </xs:sequence>
        </xs:group>

        <!-- XSD 1.1 -->
        <xs:group name="simpleRestrictionModel">
          <xs:sequence>
            <xs:element name="simpleType" type="xs:localSimpleType" minOccurs="0"/>
            <xs:choice minOccurs="0" maxOccurs="unbounded">
              <xs:element ref="xs:facet"/>  <!-- Use a substitution group -->
              <xs:any processContents="lax" namespace="##other"/>
            </xs:choice>
          </xs:sequence>
        </xs:group>
        """
        # Sequence with an optional single element and an optional unlimited choice.
        group = self.schema_class.meta_schema.groups['simpleRestrictionModel']

        model = ModelVisitor(group)

        if self.schema_class.XSD_VERSION == '1.0':
            self.assertEqual(model.element, group[0])
            self.check_advance_true(model)      # <simpleType> match
            self.assertEqual(model.element, group[1][0][0])
            self.check_advance_false(model)     # <maxExclusive> do not match
            self.assertEqual(model.element, group[1][0][1])
            self.check_advance_false(model)     # <maxExclusive> do not match
            self.assertEqual(model.element, group[1][0][2])
            self.check_advance_true(model)      # <maxExclusive> match
            self.assertEqual(model.element, group[1][0][0])
            for _ in range(12):
                self.check_advance_false(model)  # no match for all the inner choice group "xs:facets"
            self.assertIsNone(model.element)

    def test_meta_schema_top_model(self):
        """
        <xs:group name="schemaTop">
          <xs:choice>
            <xs:group ref="xs:redefinable"/>
            <xs:element ref="xs:element"/>
            <xs:element ref="xs:attribute"/>
            <xs:element ref="xs:notation"/>
          </xs:choice>
        </xs:group>

        <xs:group name="redefinable">
          <xs:choice>
            <xs:element ref="xs:simpleType"/>
            <xs:element ref="xs:complexType"/>
            <xs:element ref="xs:group"/>
            <xs:element ref="xs:attributeGroup"/>
          </xs:choice>
        </xs:group>
        """
        group = self.schema_class.meta_schema.groups['schemaTop']

        model = ModelVisitor(group)
        self.assertEqual(model.element, group[0][0][0])
        self.check_advance_false(model)                 # <simpleType> don't match
        self.assertEqual(model.element, group[0][0][1])
        self.check_advance_true(model)                  # <complexType> match
        self.assertIsNone(model.element)

        model.restart()
        self.assertEqual(model.element, group[0][0][0])
        self.check_advance_false(model)                 # <simpleType> don't match
        self.assertEqual(model.element, group[0][0][1])
        self.check_advance_false(model)                 # <complexType> don't match
        self.assertEqual(model.element, group[0][0][2])
        self.check_advance_false(model)                 # <group> don't match
        self.assertEqual(model.element, group[0][0][3])
        self.check_advance_false(model)                 # <attributeGroup> don't match
        self.assertEqual(model.element, group[1])
        self.check_advance_false(model)                 # <element> don't match
        self.assertEqual(model.element, group[2])
        self.check_advance_false(model)                 # <attribute> don't match
        self.assertEqual(model.element, group[3])
        self.check_advance_false(model, [(group, 0, group[0][0][:] + group[1:])])  # <notation> don't match

        model.restart()
        self.assertEqual(model.element, group[0][0][0])
        self.check_advance_false(model)                 # <simpleType> don't match
        self.assertEqual(model.element, group[0][0][1])
        self.check_advance_false(model)                 # <complexType> don't match
        self.assertEqual(model.element, group[0][0][2])
        self.check_advance_false(model)                 # <group> don't match
        self.assertEqual(model.element, group[0][0][3])
        self.check_advance_false(model)                 # <attributeGroup> don't match
        self.assertEqual(model.element, group[1])
        self.check_advance_false(model)                 # <element> don't match
        self.assertEqual(model.element, group[2])
        self.check_advance_true(model)                  # <attribute> match
        self.assertIsNone(model.element)

    def test_meta_attr_declarations_group(self):
        """
        <xs:group name="attrDecls">
          <xs:sequence>
            <xs:choice minOccurs="0" maxOccurs="unbounded">
              <xs:element name="attribute" type="xs:attribute"/>
              <xs:element name="attributeGroup" type="xs:attributeGroupRef"/>
            </xs:choice>
            <xs:element ref="xs:anyAttribute" minOccurs="0"/>
          </xs:sequence>
        </xs:group>
        """
        group = self.schema_class.meta_schema.groups['attrDecls']

        model = ModelVisitor(group)
        for match in [False, False, True]:
            self.check_advance(model, match)
        self.assertIsNone(model.element)

        model = ModelVisitor(group)
        self.check_advance_false(model)
        self.check_advance_true(model)
        self.assertEqual(model.element, group[0][0])

        model = ModelVisitor(group)
        for match in [False, True, False, False]:
            self.check_advance(model, match)
        self.assertEqual(model.element, group[1])

        model = ModelVisitor(group)
        for match in [False, True, True, False, True, False, False]:
            self.check_advance(model, match)
        self.assertEqual(model.element, group[1])

    def test_meta_complex_type_model(self):
        """
        <xs:group name="complexTypeModel">
          <xs:choice>
            <xs:element ref="xs:simpleContent"/>
            <xs:element ref="xs:complexContent"/>
            <xs:sequence>
              <xs:group ref="xs:typeDefParticle" minOccurs="0"/>
              <xs:group ref="xs:attrDecls"/>
            </xs:sequence>
          </xs:choice>
        </xs:group>

        <xs:group name="typeDefParticle">
          <xs:choice>
            <xs:element name="group" type="xs:groupRef"/>
            <xs:element ref="xs:all"/>
            <xs:element ref="xs:choice"/>
            <xs:element ref="xs:sequence"/>
          </xs:choice>
        </xs:group>

        <xs:group name="complexTypeModel">
          <xs:choice>
            <xs:element ref="xs:simpleContent"/>
            <xs:element ref="xs:complexContent"/>
            <xs:sequence>
              <xs:element ref="xs:openContent" minOccurs="0"/>
              <xs:group ref="xs:typeDefParticle" minOccurs="0"/>
              <xs:group ref="xs:attrDecls"/>
              <xs:group ref="xs:assertions"/>
            </xs:sequence>
          </xs:choice>
        </xs:group>

        """
        group = self.schema_class.meta_schema.groups['complexTypeModel']

        model = ModelVisitor(group)
        self.assertEqual(model.element, group[0])
        self.check_advance_true(model)                  # <simpleContent> match
        self.assertIsNone(model.element)

        model.restart()
        self.assertEqual(model.element, group[0])
        self.check_advance_false(model)
        self.check_advance_true(model)                  # <complexContent> match
        self.assertIsNone(model.element)

        if self.schema_class.XSD_VERSION == '1.0':
            model.restart()
            self.assertEqual(model.element, group[0])
            for match in [False, False, False, False, True]:
                self.check_advance(model, match)            # <all> match
            self.check_stop(model)
            self.assertIsNone(model.element)

            model.restart()
            self.assertEqual(model.element, group[0])
            for match in [False, False, False, False, True, False, True, False, False, False]:
                self.check_advance(model, match)            # <all> match, <attributeGroup> match
            self.assertIsNone(model.element)

    def test_meta_schema_document_model(self):
        group = self.schema_class.meta_schema.elements['schema'].type.content_type

        # A schema model with a wrong tag
        model = ModelVisitor(group)
        if self.schema_class.XSD_VERSION == '1.0':
            self.assertEqual(model.element, group[0][0])
            self.check_advance_false(model)                 # eg. anyAttribute
            self.check_stop(model)
        else:
            self.assertEqual(model.element, group[0][0][0])

    #
    # Tests on schema test_cases/features/models/models.xsd
    def test_model_group1(self):
        group = self.models_schema.groups['group1']

        model = ModelVisitor(group)
        self.assertEqual(model.element, group[0])
        self.check_stop(model)

        model.restart()
        self.assertEqual(model.element, group[0])
        for _ in range(3):
            self.check_advance_false(model)
        self.assertIsNone(model.element)

        model.restart()
        for match in [False, True, False]:
            self.check_advance(model, match)
        self.assertIsNone(model.element)

    def test_model_group2(self):
        group = self.models_schema.groups['group2']

        model = ModelVisitor(group)
        self.assertEqual(model.element, group[0])
        for _ in range(3):
            self.check_advance_false(model)                 # group1 do not match
        self.assertEqual(model.element, group[1][0][0][2])  # <elem3> of group1
        for _ in range(8):
            self.check_advance_false(model)
        self.assertEqual(model.element, group[2])           # <elem12>
        self.check_advance_false(model)
        self.assertEqual(model.element, group[3])           # <elem13>
        self.check_advance_false(model)
        self.assertIsNone(model.element)

    def test_model_group3(self):
        group = self.models_schema.groups['group3']

        model = ModelVisitor(group)
        self.assertEqual(model.element, group[0])
        for match in [True, False, True]:
            self.check_advance(model, match)
        self.check_stop(model)

    def test_model_group4(self):
        group = self.models_schema.groups['group4']

        model = ModelVisitor(group)
        self.assertEqual(model.element, group[0])
        for match in [True, False, True]:
            self.check_advance(model, match)
        self.check_stop(model)

    def test_model_group5(self):
        group = self.models_schema.groups['group5']

        model = ModelVisitor(group)
        self.assertEqual(model.element, group[0][0])
        for _ in range(5):   # match [<elem1> .. <elem5>]
            self.check_advance_true(model)
        self.assertEqual(model.element.name, 'elem6')
        self.check_advance_true(model)                 # match choice with <elem6>
        self.check_stop(model)

    def test_model_group6(self):
        group = self.models_schema.groups['group6']

        model = ModelVisitor(group)
        self.assertEqual(model.element, group[0][0])
        self.check_advance_true(model)                 # match choice with <elem1>
        self.check_advance_true(model)                 # match choice with <elem2>
        self.assertIsNone(model.element)

    def test_model_group7(self):
        group = self.models_schema.types['complexType7'].content_type

        model = ModelVisitor(group)
        self.assertEqual(model.element, group[0][0])
        self.check_stop(model, [(group[0][0], 0, [group[0][0]])])

        group = self.models_schema.types['complexType7_emptiable'].content_type

        model = ModelVisitor(group)
        self.assertEqual(model.element, group[0][0])
        self.check_stop(model)

    def test_model_group8(self):
        group = self.models_schema.groups['group8']

        model = ModelVisitor(group)
        self.assertEqual(model.element, group[0][0])
        self.check_advance_true(model)                 # match choice with <elem1>
        self.check_advance_false(model)
        self.assertEqual(model.element, group[0][1])
        self.check_advance_true(model)                 # match choice with <elem2>
        self.assertEqual(model.element, group[0][2])
        self.check_advance_true(model)                 # match choice with <elem3>
        self.assertEqual(model.element, group[0][3])
        self.check_advance_true(model)                 # match choice with <elem4>
        self.assertIsNone(model.element)

    #
    # Tests on issues
    def test_issue_086(self):
        issue_086_xsd = casepath('issues/issue_086/issue_086.xsd')
        schema = self.schema_class(issue_086_xsd)
        group = schema.types['Foo'].content_type

        # issue_086-1.xml sequence simulation
        model = ModelVisitor(group)
        self.assertEqual(model.element, group[0])
        self.check_advance_true(model)  # <header> matching
        self.assertEqual(model.element, group[1][0][0])  # 'a' element
        self.check_advance_true(model)  # <a> matching
        self.assertEqual(model.element, group[1][0][0])  # 'a' element
        self.check_advance_true(model)  # <a> matching
        self.assertEqual(model.element, group[1][0][0])  # 'a' element
        self.check_advance_false(model)
        self.assertEqual(model.element, group[1][0][0])  # 'a' element
        self.check_advance_false(model)
        self.assertEqual(model.element, group[1][1][0])  # 'b' element
        self.check_advance_true(model)  # <b> matching
        self.assertEqual(model.element, group[1][1][0])  # 'b' element
        self.check_advance_true(model)  # <b> matching
        self.check_advance_false(model)
        self.assertEqual(model.element, group[1][0][0])  # 'a' element (choice group restarted)
        self.check_advance_false(model)
        self.check_advance_false(model)
        self.assertEqual(model.element, group[1][2][0])  # 'c' element
        self.check_advance_true(model)  # <c> matching
        self.assertEqual(model.element, group[1][2][0])  # 'c' element
        self.check_advance_true(model)  # <c> matching
        self.check_stop(model)

        # issue_086-2.xml sequence simulation
        model = ModelVisitor(group)
        self.check_advance_true(model)  # <header> matching
        self.assertEqual(model.element, group[1][0][0])  # 'a' element
        self.check_advance_false(model)
        self.assertEqual(model.element, group[1][1][0])  # 'b' element
        self.check_advance_true(model)  # <b> matching
        self.assertEqual(model.element, group[1][1][0])  # 'b' element
        self.check_advance_true(model)  # <b> matching
        self.check_advance_false(model)
        self.assertEqual(model.element, group[1][0][0])  # 'a' element (choice group restarted)
        self.check_advance_false(model)
        self.check_advance_false(model)
        self.assertEqual(model.element, group[1][2][0])  # 'c' element
        self.check_advance_true(model)  # <c> matching
        self.assertEqual(model.element, group[1][2][0])  # 'c' element
        self.check_advance_true(model)  # <c> matching
        self.check_advance_false(model)
        self.assertEqual(model.element, group[1][0][0])  # 'a' element
        self.check_advance_true(model)  # <a> matching
        self.assertEqual(model.element, group[1][0][0])  # 'a' element
        self.check_advance_true(model)  # <a> matching
        self.assertEqual(model.element, group[1][0][0])  # 'a' element
        self.check_stop(model)


class TestModelValidation11(TestModelValidation):
    schema_class = XMLSchema11


class TestModelBasedSorting(XsdValidatorTestCase):

    def test_sort_content(self):
        # test of ModelVisitor's sort_content/iter_unordered_content
        schema = self.get_schema("""
            <xs:element name="A" type="A_type" />
            <xs:complexType name="A_type">
                <xs:sequence>
                    <xs:element name="B1" type="xs:string"/>
                    <xs:element name="B2" type="xs:integer"/>
                    <xs:element name="B3" type="xs:boolean"/>
                </xs:sequence>
            </xs:complexType>
            """)

        model = ModelVisitor(schema.types['A_type'].content_type)

        self.assertListEqual(
            model.sort_content([('B2', 10), ('B1', 'abc'), ('B3', True)]),
            [('B1', 'abc'), ('B2', 10), ('B3', True)]
        )
        self.assertListEqual(
            model.sort_content([('B3', True), ('B2', 10), ('B1', 'abc')]),
            [('B1', 'abc'), ('B2', 10), ('B3', True)]
        )
        self.assertListEqual(
            model.sort_content([('B2', 10), ('B4', None), ('B1', 'abc'), ('B3', True)]),
            [('B1', 'abc'), ('B2', 10), ('B3', True), ('B4', None)]
        )
        content = [('B2', 10), ('B4', None), ('B1', 'abc'), (1, 'hello'), ('B3', True)]
        self.assertListEqual(
            model.sort_content(content),
            [(1, 'hello'), ('B1', 'abc'), ('B2', 10), ('B3', True), ('B4', None)]
        )
        content = [(2, 'world!'), ('B2', 10), ('B4', None), ('B1', 'abc'), (1, 'hello'), ('B3', True)]
        self.assertListEqual(
            model.sort_content(content),
            [(1, 'hello'), ('B1', 'abc'), (2, 'world!'), ('B2', 10), ('B3', True), ('B4', None)]
        )

        # With a dict-type argument
        content = ordered_dict_class([('B2', [10]), ('B1', ['abc']), ('B3', [True])])
        self.assertListEqual(
            model.sort_content(content), [('B1', 'abc'), ('B2', 10), ('B3', True)]
        )
        content = ordered_dict_class([('B2', [10]), ('B1', ['abc']), ('B3', [True]), (1, 'hello')])
        self.assertListEqual(
            model.sort_content(content), [(1, 'hello'), ('B1', 'abc'), ('B2', 10), ('B3', True)]
        )

        # With partial content
        self.assertListEqual(model.sort_content([]), [])
        self.assertListEqual(model.sort_content([('B1', 'abc')]), [('B1', 'abc')])
        self.assertListEqual(model.sort_content([('B2', 10)]), [('B2', 10)])
        self.assertListEqual(model.sort_content([('B3', True)]), [('B3', True)])
        self.assertListEqual(
            model.sort_content([('B3', True), ('B1', 'abc')]), [('B1', 'abc'), ('B3', True)]
        )
        self.assertListEqual(
            model.sort_content([('B2', 10), ('B1', 'abc')]), [('B1', 'abc'), ('B2', 10)]
        )
        self.assertListEqual(
            model.sort_content([('B3', True), ('B2', 10)]), [('B2', 10), ('B3', True)]
        )

    def test_iter_collapsed_content_with_optional_elements(self):
        schema = self.get_schema("""
            <xs:element name="A" type="A_type" />
            <xs:complexType name="A_type">
                <xs:sequence>
                    <xs:element name="B1" minOccurs="0" />
                    <xs:element name="B2" minOccurs="0" />
                    <xs:element name="B3" />
                    <xs:element name="B4" />
                    <xs:element name="B5" />
                    <xs:element name="B6" minOccurs="0" />
                    <xs:element name="B7" />
                </xs:sequence>
            </xs:complexType>
            """)

        model = ModelVisitor(schema.types['A_type'].content_type)

        content = [('B3', 10), ('B4', None), ('B5', True), ('B6', 'alpha'), ('B7', 20)]
        model.restart()
        self.assertListEqual(
            list(model.iter_collapsed_content(content)), content
        )

        content = [('B3', 10), ('B5', True), ('B6', 'alpha'), ('B7', 20)]  # Missing B4
        model.restart()
        self.assertListEqual(
            list(model.iter_collapsed_content(content)), content
        )

    def test_iter_collapsed_content_with_repeated_elements(self):
        schema = self.get_schema("""
            <xs:element name="A" type="A_type" />
            <xs:complexType name="A_type">
                <xs:sequence>
                    <xs:element name="B1" minOccurs="0" />
                    <xs:element name="B2" minOccurs="0" maxOccurs="unbounded" />
                    <xs:element name="B3" maxOccurs="unbounded" />
                    <xs:element name="B4" />
                    <xs:element name="B5" maxOccurs="unbounded" />
                    <xs:element name="B6" minOccurs="0" />
                    <xs:element name="B7" maxOccurs="unbounded" />
                </xs:sequence>
            </xs:complexType>
            """)

        model = ModelVisitor(schema.types['A_type'].content_type)

        content = [
            ('B3', 10), ('B4', None), ('B5', True), ('B5', False), ('B6', 'alpha'), ('B7', 20)
        ]
        self.assertListEqual(
            list(model.iter_collapsed_content(content)), content
        )

        content = [('B3', 10), ('B3', 11), ('B3', 12), ('B4', None), ('B5', True),
                   ('B5', False), ('B6', 'alpha'), ('B7', 20), ('B7', 30)]
        model.restart()
        self.assertListEqual(
            list(model.iter_collapsed_content(content)), content
        )

        content = [('B3', 10), ('B3', 11), ('B3', 12), ('B4', None), ('B5', True), ('B5', False)]
        model.restart()
        self.assertListEqual(
            list(model.iter_collapsed_content(content)), content
        )

    def test_iter_collapsed_content_with_repeated_groups(self):
        schema = self.get_schema("""
            <xs:element name="A" type="A_type" />
            <xs:complexType name="A_type">
                <xs:sequence minOccurs="1" maxOccurs="2">
                    <xs:element name="B1" minOccurs="0" />
                    <xs:element name="B2" minOccurs="0" />
                </xs:sequence>
            </xs:complexType>
            """)

        model = ModelVisitor(schema.types['A_type'].content_type)

        content = [('B1', 1), ('B1', 2), ('B2', 3), ('B2', 4)]
        self.assertListEqual(
            list(model.iter_collapsed_content(content)),
            [('B1', 1), ('B2', 3), ('B1', 2), ('B2', 4)]
        )

        # Model broken by unknown element at start
        content = [('X', None), ('B1', 1), ('B1', 2), ('B2', 3), ('B2', 4)]
        model.restart()
        self.assertListEqual(list(model.iter_collapsed_content(content)), content)

        content = [('B1', 1), ('X', None), ('B1', 2), ('B2', 3), ('B2', 4)]
        model.restart()
        self.assertListEqual(list(model.iter_collapsed_content(content)), content)

        content = [('B1', 1), ('B1', 2), ('X', None), ('B2', 3), ('B2', 4)]
        model.restart()
        self.assertListEqual(list(model.iter_collapsed_content(content)), content)

        content = [('B1', 1), ('B1', 2), ('B2', 3), ('X', None), ('B2', 4)]
        model.restart()
        self.assertListEqual(
            list(model.iter_collapsed_content(content)),
            [('B1', 1), ('B2', 3), ('B1', 2), ('X', None), ('B2', 4)]
        )

        content = [('B1', 1), ('B1', 2), ('B2', 3), ('B2', 4), ('X', None)]
        model.restart()
        self.assertListEqual(
            list(model.iter_collapsed_content(content)),
            [('B1', 1), ('B2', 3), ('B1', 2), ('B2', 4), ('X', None)]
        )

    def test_iter_collapsed_content_with_single_elements(self):
        schema = self.get_schema("""
            <xs:element name="A" type="A_type" />
            <xs:complexType name="A_type">
                <xs:sequence>
                    <xs:element name="B1" />
                    <xs:element name="B2" />
                    <xs:element name="B3" />
                </xs:sequence>
            </xs:complexType>
            """)

        model = ModelVisitor(schema.types['A_type'].content_type)

        content = [('B1', 'abc'), ('B2', 10), ('B3', False)]
        model.restart()
        self.assertListEqual(list(model.iter_collapsed_content(content)), content)

        content = [('B3', False), ('B1', 'abc'), ('B2', 10)]
        model.restart()
        self.assertListEqual(list(model.iter_collapsed_content(content)), content)

        content = [('B1', 'abc'), ('B3', False), ('B2', 10)]
        model.restart()
        self.assertListEqual(list(model.iter_collapsed_content(content)), content)

        content = [('B1', 'abc'), ('B1', 'def'), ('B2', 10), ('B3', False)]
        model.restart()
        self.assertListEqual(
            list(model.iter_collapsed_content(content)),
            [('B1', 'abc'), ('B2', 10), ('B3', False), ('B1', 'def')]
        )

        content = [('B1', 'abc'), ('B2', 10), ('X', None)]
        model.restart()
        self.assertListEqual(list(model.iter_collapsed_content(content)), content)

        content = [('X', None), ('B1', 'abc'), ('B2', 10), ('B3', False)]
        model.restart()
        self.assertListEqual(list(model.iter_collapsed_content(content)), content)


if __name__ == '__main__':
    from xmlschema.tests import print_test_header

    print_test_header()
    unittest.main()