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test_xpath1_parser.py
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test_xpath1_parser.py
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#!/usr/bin/env python
#
# Copyright (c), 2018-2021, 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>
#
#
# Note: Many tests are built using the examples of the XPath standards,
# published by W3C under the W3C Document License.
#
# References:
# http://www.w3.org/TR/1999/REC-xpath-19991116/
# http://www.w3.org/TR/2010/REC-xpath20-20101214/
# http://www.w3.org/TR/2010/REC-xpath-functions-20101214/
# https://www.w3.org/Consortium/Legal/2015/doc-license
# https://www.w3.org/TR/charmod-norm/
#
import unittest
import sys
import io
import math
import pickle
from decimal import Decimal
from typing import Optional, List, Tuple
from xml.etree import ElementTree
try:
import lxml.etree as lxml_etree
except ImportError:
lxml_etree = None
try:
import xmlschema
except ImportError:
xmlschema = None
from elementpath import *
from elementpath.namespaces import XSD_NAMESPACE, XPATH_FUNCTIONS_NAMESPACE, \
XSD_ANY_ATOMIC_TYPE, XSD_ANY_SIMPLE_TYPE, XSD_UNTYPED_ATOMIC
try:
from tests import xpath_test_class
except ImportError:
import xpath_test_class
XML_GENERIC_TEST = """
<root>
<a id="a_id">
<b>some content</b>
<c> space space \t .</c></a>
</root>"""
XML_DATA_TEST = """
<values>
<a>3.4</a>
<a>20</a>
<a>-10.1</a>
<b>alpha</b>
<c>true</c>
<d>44</d>
</values>"""
# noinspection PyPropertyAccess,PyTypeChecker
class XPath1ParserTest(xpath_test_class.XPathTestCase):
def setUp(self):
self.parser = XPath1Parser(self.namespaces, strict=True)
#
# Test methods
@unittest.skipIf(sys.version_info < (3,), "Python 2 pickling is not supported.")
def test_parser_pickling(self):
if getattr(self.parser, 'schema', None) is None:
obj = pickle.dumps(self.parser)
parser = pickle.loads(obj)
obj = pickle.dumps(self.parser.symbol_table)
symbol_table = pickle.loads(obj)
self.assertEqual(self.parser, parser)
self.assertEqual(self.parser.symbol_table, symbol_table)
def test_xpath_tokenizer(self):
# tests from the XPath specification
self.check_tokenizer("*", ['*'])
self.check_tokenizer("text()", ['text', '(', ')'])
self.check_tokenizer("@name", ['@', 'name'])
self.check_tokenizer("@*", ['@', '*'])
self.check_tokenizer("para[1]", ['para', '[', '1', ']'])
self.check_tokenizer("para[last()]", ['para', '[', 'last', '(', ')', ']'])
self.check_tokenizer("*/para", ['*', '/', 'para'])
self.check_tokenizer("/doc/chapter[5]/section[2]",
['/', 'doc', '/', 'chapter', '[', '5', ']', '/', 'section',
'[', '2', ']'])
self.check_tokenizer("chapter//para", ['chapter', '//', 'para'])
self.check_tokenizer("//para", ['//', 'para'])
self.check_tokenizer("//olist/item", ['//', 'olist', '/', 'item'])
self.check_tokenizer(".", ['.'])
self.check_tokenizer(".//para", ['.', '//', 'para'])
self.check_tokenizer("..", ['..'])
self.check_tokenizer("../@lang", ['..', '/', '@', 'lang'])
self.check_tokenizer("chapter[title]", ['chapter', '[', 'title', ']'])
self.check_tokenizer(
"employee[@secretary and @assistant]",
['employee', '[', '@', 'secretary', '', 'and', '', '@', 'assistant', ']']
)
self.check_tokenizer('/root/a/true()', ['/', 'root', '/', 'a', '/', 'true', '(', ')'])
# additional tests from Python XML etree test cases
self.check_tokenizer("{http://spam}egg", ['{', 'http', ':', '//', 'spam', '}', 'egg'])
self.check_tokenizer("./spam.egg", ['.', '/', 'spam.egg'])
self.check_tokenizer(".//spam:egg", ['.', '//', 'spam', ':', 'egg'])
# additional tests
self.check_tokenizer("substring-after()", ['substring-after', '(', ')'])
self.check_tokenizer("contains('XML','XM')", ['contains', '(', "'XML'", ',', "'XM'", ')'])
self.check_tokenizer(
"concat('XML', true(), 10)",
['concat', '(', "'XML'", ',', '', 'true', '(', ')', ',', '', '10', ')']
)
self.check_tokenizer("concat('a', 'b', 'c')",
['concat', '(', "'a'", ',', '', "'b'", ',', '', "'c'", ')'])
self.check_tokenizer("_last()", ['_last', '(', ')'])
self.check_tokenizer("last ()", ['last', '', '(', ')'])
self.check_tokenizer('child::text()', ['child', '::', 'text', '(', ')'])
self.check_tokenizer('./ /.', ['.', '/', '', '/', '.'])
self.check_tokenizer('tns :*', ['tns', '', ':', '*'])
def test_tokens(self):
# Literals
self.check_token('(string)', 'literal', "'hello' string",
"_string_literal_token(value='hello')", 'hello')
self.check_token('(integer)', 'literal', "1999 integer",
"_integer_literal_token(value=1999)", 1999)
self.check_token('(float)', 'literal', "3.1415 float",
"_float_literal_token(value=3.1415)", 3.1415)
self.check_token('(decimal)', 'literal', "217.35 decimal",
"_decimal_literal_token(value=217.35)", 217.35)
self.check_token('(name)', 'literal', "'schema' name",
"_name_literal_token(value='schema')", 'schema')
# Variables
self.check_token('$', 'operator', "$ variable reference",
"_DollarSign_operator_token()")
# Axes
self.check_token('self', 'axis', "'self' axis", "_self_axis_token()")
self.check_token('child', 'axis', "'child' axis", "_child_axis_token()")
self.check_token('parent', 'axis', "'parent' axis", "_parent_axis_token()")
self.check_token('ancestor', 'axis', "'ancestor' axis", "_ancestor_axis_token()")
self.check_token('preceding', 'axis', "'preceding' axis", "_preceding_axis_token()")
self.check_token('descendant-or-self', 'axis', "'descendant-or-self' axis")
self.check_token('following-sibling', 'axis', "'following-sibling' axis")
self.check_token('preceding-sibling', 'axis', "'preceding-sibling' axis")
self.check_token('ancestor-or-self', 'axis', "'ancestor-or-self' axis")
self.check_token('descendant', 'axis', "'descendant' axis")
if self.parser.version == '1.0':
self.check_token('attribute', 'axis', "'attribute' axis")
self.check_token('following', 'axis', "'following' axis")
self.check_token('namespace', 'axis', "'namespace' axis")
# Functions
self.check_token(
'position', 'function', "'position' function", "_position_function_token()"
)
# Operators
self.check_token('and', 'operator', "'and' operator", "_and_operator_token()")
if self.parser.version == '1.0':
self.check_token(',', 'symbol', "comma symbol", "_Comma_symbol_token()")
else:
self.check_token(',', 'operator', "comma operator", "_Comma_operator_token()")
def test_token_tree(self):
self.check_tree('child::B1', '(child (B1))')
self.check_tree('A/B//C/D', '(/ (// (/ (A) (B)) (C)) (D))')
self.check_tree('child::*/child::B1', '(/ (child (*)) (child (B1)))')
self.check_tree('attribute::name="Galileo"', "(= (attribute (name)) ('Galileo'))")
self.check_tree('1 + 2 * 3', '(+ (1) (* (2) (3)))')
self.check_tree('(1 + 2) * 3', '(* (+ (1) (2)) (3))')
self.check_tree("false() and true()", '(and (false) (true))')
self.check_tree("false() or true()", '(or (false) (true))')
self.check_tree("./A/B[C][D]/E", '(/ (/ (/ (.) (A)) ([ ([ (B) (C)) (D))) (E))')
self.check_tree("string(xml:lang)", '(string (: (xml) (lang)))')
self.check_tree("//text/preceding-sibling::text[1]",
'(/ (// (text)) ([ (preceding-sibling (text)) (1)))')
def test_token_source(self):
self.check_source(' child ::B1', 'child::B1')
self.check_source('false()', 'false()')
self.check_source("concat('alpha', 'beta', 'gamma')", "concat('alpha', 'beta', 'gamma')")
self.check_source('1 +2 * 3 ', '1 + 2 * 3')
self.check_source('(1 + 2) * 3', '(1 + 2) * 3')
self.check_source(' eg:example ', 'eg:example')
self.check_source('attribute::name="Galileo"', "attribute::name = 'Galileo'")
self.check_source(".//eg:a | .//eg:b", '. // eg:a | . // eg:b')
self.check_source("/A/B[C]", '/ A / B[C]')
try:
self.parser.strict = False
self.check_source("{tns1}name", '{tns1}name')
finally:
self.parser.strict = True
def test_parser_position(self):
self.assertEqual(self.parser.position, (1, 1))
with self.assertRaises(SyntaxError) as ctx:
self.parser.parse('child::node())')
self.assertIn('line 1, column 14', str(ctx.exception))
with self.assertRaises(SyntaxError) as ctx:
self.parser.parse(' child::node())')
self.assertIn('line 1, column 15', str(ctx.exception))
with self.assertRaises(SyntaxError) as ctx:
self.parser.parse(' child::node( ))')
self.assertIn('line 1, column 16', str(ctx.exception))
with self.assertRaises(SyntaxError) as ctx:
self.parser.parse(' child::node() )')
self.assertIn('line 1, column 16', str(ctx.exception))
with self.assertRaises(SyntaxError) as ctx:
self.parser.parse('^)')
self.assertIn('line 1, column 1', str(ctx.exception))
with self.assertRaises(SyntaxError) as ctx:
self.parser.parse(' ^)')
self.assertIn('line 1, column 2', str(ctx.exception))
def test_wrong_syntax(self):
self.wrong_syntax('')
self.wrong_syntax(" \n \n )")
self.wrong_syntax('child::1')
self.wrong_syntax("{}egg")
self.wrong_syntax("./*:*")
self.wrong_syntax('./ /.')
self.wrong_syntax(' eg : example ')
def test_wrong_nargs(self):
self.wrong_type("boolean()") # Too few arguments
self.wrong_type("count(0, 1, 2)") # Too many arguments
self.wrong_type("round(2.5, 1.7)")
self.wrong_type("contains('XPath', 'XP', 20)")
self.wrong_type("boolean(1, 5)")
def test_xsd_qname_method(self):
qname = self.parser.xsd_qname('string')
self.assertEqual(qname, 'xs:string')
parser = self.parser.__class__(namespaces={'xs': XSD_NAMESPACE})
parser.namespaces['xsd'] = parser.namespaces.pop('xs')
self.assertEqual(parser.xsd_qname('string'), 'xsd:string')
parser.namespaces.pop('xsd')
with self.assertRaises(NameError) as ctx:
parser.xsd_qname('string')
self.assertIn('XPST0081', str(ctx.exception))
def test_is_instance_method(self):
self.assertTrue(self.parser.is_instance(datatypes.UntypedAtomic(1),
XSD_UNTYPED_ATOMIC))
self.assertFalse(self.parser.is_instance(1, XSD_UNTYPED_ATOMIC))
self.assertTrue(self.parser.is_instance(1, XSD_ANY_ATOMIC_TYPE))
self.assertFalse(self.parser.is_instance([1], XSD_ANY_ATOMIC_TYPE))
self.assertTrue(self.parser.is_instance(1, XSD_ANY_SIMPLE_TYPE))
self.assertTrue(self.parser.is_instance([1], XSD_ANY_SIMPLE_TYPE))
self.assertTrue(self.parser.is_instance('foo', '{%s}string' % XSD_NAMESPACE))
self.assertFalse(self.parser.is_instance(1, '{%s}string' % XSD_NAMESPACE))
self.assertTrue(self.parser.is_instance(1.0, '{%s}double' % XSD_NAMESPACE))
self.assertFalse(self.parser.is_instance(1.0, '{%s}float' % XSD_NAMESPACE))
self.parser._xsd_version = '1.1'
try:
self.assertTrue(self.parser.is_instance(1.0, '{%s}double' % XSD_NAMESPACE))
self.assertFalse(self.parser.is_instance(1.0, '{%s}float' % XSD_NAMESPACE))
finally:
self.parser._xsd_version = '1.0'
with self.assertRaises(KeyError):
self.parser.is_instance('foo', '{%s}unknown' % XSD_NAMESPACE)
if xmlschema is not None and self.parser.version > '1.0':
schema = xmlschema.XMLSchema("""
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
<xs:simpleType name="myInt">
<xs:restriction base="xs:int"/>
</xs:simpleType>
</xs:schema>""")
self.parser.schema = xmlschema.xpath.XMLSchemaProxy(schema)
try:
self.assertFalse(self.parser.is_instance(1.0, 'myInt'))
self.assertTrue(self.parser.is_instance(1, 'myInt'))
with self.assertRaises(KeyError):
self.parser.is_instance(1.0, 'dType')
finally:
self.parser.schema = None
def test_check_variables_method(self):
self.assertIsNone(self.parser.check_variables({
'values': [1, 2, -1],
'myaddress': 'info@example.com',
'word': ''
}))
with self.assertRaises(TypeError) as ctx:
self.parser.check_variables({'values': [None, 2, -1]})
error_message = str(ctx.exception)
self.assertIn('XPDY0050', error_message)
self.assertIn('Unmatched sequence type', error_message)
with self.assertRaises(TypeError) as ctx:
self.parser.check_variables({'other': None})
error_message = str(ctx.exception)
self.assertIn('XPDY0050', error_message)
self.assertIn('Unmatched sequence type', error_message)
# XPath expression tests
def test_node_selection(self):
root = self.etree.XML('<A><B1/><B2/><B3/><B2/></A>')
self.check_value("mars", MissingContextError)
self.check_value("mars", [], context=XPathContext(root))
self.check_value("B1", [root[0]], context=XPathContext(root))
self.check_value("B2", [root[1], root[3]], context=XPathContext(root))
self.check_value("B4", [], context=XPathContext(root))
def test_prefixed_references(self):
namespaces = {'tst': "http://xpath.test/ns"}
root = self.etree.XML("""
<A xmlns:tst="http://xpath.test/ns">
<tst:B1 b1="beta1"/>
<tst:B2/>
<tst:B3 b2="tst:beta2" b3="beta3"/>
<tst:B2/>
</A>""")
# Prefix references
self.check_tree('eg:unknown', '(: (eg) (unknown))')
self.check_tree('string(eg:unknown)', '(string (: (eg) (unknown)))')
# Test evaluate method
self.check_value("fn:true()", True)
self.check_value("fx:true()", NameError)
self.check_value("tst:B1", [root[0]], context=XPathContext(root))
self.check_value("tst:B2", [root[1], root[3]], context=XPathContext(root))
self.check_value("tst:B1:B2", NameError)
self.check_selector("./tst:B1", root, [root[0]], namespaces=namespaces)
self.check_selector("./tst:*", root, root[:], namespaces=namespaces)
self.wrong_syntax("./tst:1")
self.check_value("./fn:A", MissingContextError)
self.wrong_type("./xs:true()")
# Namespace wildcard works only for XPath > 1.0
if self.parser.version == '1.0':
self.check_selector("./*:B2", root, Exception, namespaces=namespaces)
else:
self.check_selector("./*:B2", root, [root[1], root[3]], namespaces=namespaces)
def test_qname_uri_references(self):
root = self.etree.XML("""
<A xmlns:tst="http://xpath.test/ns">
<tst:B1 b1="beta1"/>
<tst:B2/>
<tst:B3 b2="tst:beta2" b3="beta3"/>
<tst:B2/>
</A>""")
self.parser.strict = False
self.check_tree('{%s}string' % XSD_NAMESPACE,
"({ ('http://www.w3.org/2001/XMLSchema') (string))")
self.check_tree('string({%s}unknown)' % XSD_NAMESPACE,
"(string ({ ('http://www.w3.org/2001/XMLSchema') (unknown)))")
self.wrong_syntax("{%s" % XSD_NAMESPACE)
self.wrong_syntax("{%s}1" % XSD_NAMESPACE)
self.check_value("{%s}true()" % XPATH_FUNCTIONS_NAMESPACE, True)
self.check_value("string({%s}true())" % XPATH_FUNCTIONS_NAMESPACE, 'true')
context = XPathContext(root)
name = '{%s}alpha' % XPATH_FUNCTIONS_NAMESPACE
self.check_value(name, [], context) # it's not an error to use 'fn' namespace for a name
self.parser.strict = True
self.wrong_syntax('{%s}string' % XSD_NAMESPACE)
if not hasattr(self.etree, 'LxmlError') or self.parser.version > '1.0':
# Do not test with XPath 1.0 on lxml.
self.check_selector(
"./{http://www.w3.org/2001/04/xmlenc#}EncryptedData", root, [], strict=False)
self.check_selector("./{http://xpath.test/ns}B1", root, [root[0]], strict=False)
self.check_selector("./{http://xpath.test/ns}*", root, root[:], strict=False)
def test_node_types(self):
document = self.etree.parse(io.StringIO(u'<A/>'))
element = self.etree.Element('schema')
attribute = AttributeNode('id', '0212349350')
namespace = NamespaceNode('xs', 'http://www.w3.org/2001/XMLSchema')
comment = self.etree.Comment('nothing important')
pi = self.etree.ProcessingInstruction('action')
text = TextNode('aldebaran')
context = XPathContext(element)
self.check_select("node()", [document.getroot()], context=XPathContext(document))
self.check_selector("node()", element, [])
context.item = attribute
self.check_select("self::node()", [attribute], context)
context.item = namespace
self.check_select("self::node()", [namespace], context)
self.check_value("comment()", [], context=context)
context.item = comment
self.check_select("self::node()", [comment], context)
self.check_select("self::comment()", [comment], context)
self.check_value("comment()", MissingContextError)
self.check_value("processing-instruction()", [], context=context)
context.item = pi
self.check_select("self::node()", [pi], context)
self.check_select("self::processing-instruction()", [pi], context)
self.check_select("self::processing-instruction('action')", [pi], context)
self.check_select("self::processing-instruction('other')", [], context)
self.check_value("processing-instruction()", MissingContextError)
context.item = text
self.check_select("self::node()", [text], context)
self.check_select("text()", [], context) # Selects the children
self.check_selector("node()", self.etree.XML('<author>Dickens</author>'), ['Dickens'])
self.check_selector("text()", self.etree.XML('<author>Dickens</author>'), ['Dickens'])
document = self.etree.parse(io.StringIO('<author>Dickens</author>'))
root = document.getroot()
if self.etree is not lxml_etree:
# self.check_value("//self::node()", [document, root, 'Dickens'], context=context)
# Skip lxml test because lxml's XPath doesn't include document root
self.check_selector("//self::node()", document, [document, root, 'Dickens'])
self.check_selector("/self::node()", document, [document])
self.check_selector("/self::node()", root, [root])
self.check_selector("//self::text()", root, ['Dickens'])
context = XPathContext(root)
context.item = None
self.check_value("/self::node()", expected=[], context=context)
context.item = 1
self.check_value("self::node()", expected=[], context=context)
def test_unknown_function(self):
self.wrong_type("unknown('5')", 'XPST0017', 'unknown function')
def test_node_set_id_function(self):
# XPath 1.0 id() function: https://www.w3.org/TR/1999/REC-xpath-19991116/#function-id
root = self.etree.XML('<A><B1 xml:id="foo"/><B2/><B3 xml:id="bar"/><B4 xml:id="baz"/></A>')
self.check_selector('id("foo")', root, [root[0]])
context = XPathContext(root)
self.check_value('./B/@xml:id[id("bar")]', expected=[], context=context)
context.item = None
self.check_value('id("none")', expected=[], context=context)
self.check_value('id("foo")', expected=[root[0]], context=context)
self.check_value('id("bar")', expected=[root[2]], context=context)
context.item = self.etree.Comment('a comment')
self.check_value('id("foo")', expected=[], context=context)
def test_node_set_functions(self):
root = self.etree.XML('<A><B1><C1/><C2/></B1><B2/><B3><C3/><C4/><C5/></B3></A>')
context = XPathContext(root, item=root[1], size=3, position=3)
self.check_value("position()", MissingContextError)
self.check_value("position()", 3, context=context)
self.check_value("position()<=2", MissingContextError)
self.check_value("position()<=2", False, context=context)
self.check_value("position()=3", True, context=context)
self.check_value("position()=2", False, context=context)
self.check_value("last()", MissingContextError)
self.check_value("last()", 3, context=context)
self.check_value("last()-1", 2, context=context)
self.check_selector("name(.)", root, 'A')
self.check_selector("name(A)", root, '')
self.check_selector("name(1.0)", root, TypeError)
self.check_selector("local-name(A)", root, '')
self.check_selector("namespace-uri(A)", root, '')
self.check_selector("name(B2)", root, 'B2')
self.check_selector("local-name(B2)", root, 'B2')
self.check_selector("namespace-uri(B2)", root, '')
if self.parser.version <= '1.0':
self.check_selector("name(*)", root, 'B1')
context = XPathContext(root, item=self.etree.Comment('a comment'))
self.check_value("name()", '', context=context)
root = self.etree.XML('<tst:A xmlns:tst="http://xpath.test/ns"><tst:B1/></tst:A>')
self.check_selector("name(.)", root, 'tst:A', namespaces={'tst': "http://xpath.test/ns"})
self.check_selector("local-name(.)", root, 'A')
self.check_selector("namespace-uri(.)", root, 'http://xpath.test/ns')
self.check_selector("name(tst:B1)", root, 'tst:B1',
namespaces={'tst': "http://xpath.test/ns"})
self.check_selector("name(tst:B1)", root, 'tst:B1',
namespaces={'tst': "http://xpath.test/ns", '': ''})
def test_string_function(self):
self.check_value("string()", MissingContextError)
self.check_value("string(10.0)", '10')
if self.parser.version == '1.0':
self.wrong_syntax("string(())")
else:
self.check_value("string(())", '')
root = self.etree.XML('<root>foo</root>')
self.check_value("string()", 'foo', context=XPathContext(root))
def test_string_length_function(self):
root = self.etree.XML(XML_GENERIC_TEST)
self.check_value("string-length('hello world')", 11)
self.check_value("string-length('')", 0)
self.check_selector("a[string-length(@id) = 4]", root, [root[0]])
self.check_selector("a[string-length(@id) = 3]", root, [])
self.check_selector("//b[string-length(.) = 12]", root, [root[0][0]])
self.check_selector("//b[string-length(.) = 10]", root, [])
self.check_selector("//none[string-length(.) = 10]", root, [])
self.check_value('fn:string-length("Harp not on that string, madam; that is past.")', 45)
if self.parser.version == '1.0':
self.wrong_syntax("string-length(())")
self.check_value("string-length(12345)", 5)
else:
self.check_value("string-length(())", 0)
self.check_value("string-length(('alpha'))", 5)
self.check_value("string-length(('alpha'))", 5)
self.wrong_type("string-length(12345)")
self.wrong_type("string-length(('12345', 'abc'))")
self.parser.compatibility_mode = True
self.check_value("string-length(('12345', 'abc'))", 5)
self.check_value("string-length(12345)", 5)
self.parser.compatibility_mode = False
root = self.etree.XML('<root>foo</root>')
self.check_value("string-length()", 3, context=XPathContext(root))
def test_normalize_space_function(self):
root = self.etree.XML(XML_GENERIC_TEST)
self.check_value("normalize-space(' hello \t world ')", 'hello world')
self.check_selector("//c[normalize-space(.) = 'space space .']", root, [root[0][1]])
self.check_value('fn:normalize-space(" The wealthy curled darlings of our nation. ")',
'The wealthy curled darlings of our nation.')
if self.parser.version == '1.0':
self.wrong_syntax('fn:normalize-space(())')
self.check_value("normalize-space(1000)", '1000')
self.check_value("normalize-space(true())", 'true')
else:
self.check_value('fn:normalize-space(())', '')
self.wrong_type("normalize-space(true())")
self.wrong_type("normalize-space(('\ta b c ', 'other'))")
self.parser.compatibility_mode = True
self.check_value("normalize-space(true())", 'true')
self.check_value("normalize-space(('\ta b\tc ', 'other'))", 'a b c')
self.parser.compatibility_mode = False
def test_translate_function(self):
root = self.etree.XML(XML_GENERIC_TEST)
self.check_value("translate('hello world!', 'hw', 'HW')", 'Hello World!')
self.check_value("translate('hello world!', 'hwx', 'HW')", 'Hello World!')
self.check_value("translate('hello world!', 'hw!', 'HW')", 'Hello World')
self.check_value("translate('hello world!', 'hw', 'HW!')", 'Hello World!')
self.check_selector("a[translate(@id, 'id', 'no') = 'a_no']", root, [root[0]])
self.check_selector("a[translate(@id, 'id', 'na') = 'a_no']", root, [])
self.check_selector(
"//b[translate(., 'some', 'one2') = 'one2 cnnt2nt']", root, [root[0][0]])
self.check_selector("//b[translate(., 'some', 'two2') = 'one2 cnnt2nt']", root, [])
self.check_selector("//none[translate(., 'some', 'two2') = 'one2 cnnt2nt']", root, [])
self.check_value('fn:translate("bar","abc","ABC")', 'BAr')
self.check_value('fn:translate("--aaa--","abc-","ABC")', 'AAA')
self.check_value('fn:translate("abcdabc", "abc", "AB")', "ABdAB")
if self.parser.version > '1.0':
self.check_value("translate((), 'hw', 'HW')", '')
self.wrong_type("translate((), (), 'HW')", 'XPTY0004',
'2nd argument', 'empty sequence')
self.wrong_type("translate((), 'hw', ())", 'XPTY0004',
'3rd argument', 'empty sequence')
def test_variable_substitution(self):
root = self.etree.XML('<ups-units>'
' <unit><power>40kW</power></unit>'
' <unit><power>20kW</power></unit>'
' <unit><power>30kW</power><model>XYZ</model></unit>'
'</ups-units>')
variables = {'ups1': root[0], 'ups2': root[1], 'ups3': root[2]}
self.check_selector('string($ups1/power)', root, '40kW', variables=variables)
context = XPathContext(root, variables=self.variables)
self.check_value('$word', 'alpha', context)
self.wrong_syntax('${http://xpath.test/ns}word', 'XPST0003')
if self.parser.version == '1.0':
self.wrong_syntax('$eg:word', 'variable reference requires a simple reference name')
else:
context = XPathContext(root, variables={'eg:color': 'purple'})
self.check_value('$eg:color', 'purple', context)
def test_substring_function(self):
root = self.etree.XML(XML_GENERIC_TEST)
self.check_value("substring('Preem Palver', 1)", 'Preem Palver')
self.check_value("substring('Preem Palver', 2)", 'reem Palver')
self.check_value("substring('Preem Palver', 7)", 'Palver')
self.check_value("substring('Preem Palver', 1, 5)", 'Preem')
self.wrong_type("substring('Preem Palver', 'c', 5)")
self.wrong_type("substring('Preem Palver', 1, '5')")
self.check_selector("a[substring(@id, 1) = 'a_id']", root, [root[0]])
self.check_selector("a[substring(@id, 2) = '_id']", root, [root[0]])
self.check_selector("a[substring(@id, 3) = '_id']", root, [])
self.check_selector("//b[substring(., 1, 5) = 'some ']", root, [root[0][0]])
self.check_selector("//b[substring(., 1, 6) = 'some ']", root, [])
self.check_selector("//none[substring(., 1, 6) = 'some ']", root, [])
self.check_value("substring('12345', 1.5, 2.6)", '234')
self.check_value("substring('12345', 0, 3)", '12')
if self.parser.version == '1.0':
self.check_value("substring('12345', 0 div 0, 3)", '')
self.check_value("substring('12345', 1, 0 div 0)", '')
self.check_value("substring('12345', -42, 1 div 0)", '12345')
self.check_value("substring('12345', -1 div 0, 1 div 0)", '')
else:
self.check_value('fn:substring("motor car", 6)', ' car')
self.check_value('fn:substring("metadata", 4, 3)', 'ada')
self.check_value('fn:substring("12345", 1.5, 2.6)', '234')
self.check_value('fn:substring("12345", 0, 3)', '12')
self.check_value('fn:substring("12345", 5, -3)', '')
self.check_value('fn:substring("12345", -3, 5)', '1')
self.check_value('fn:substring("12345", 0 div 0E0, 3)', '')
self.check_value('fn:substring("12345", 1, 0 div 0E0)', '')
self.check_value('fn:substring((), 1, 3)', '')
self.check_value('fn:substring("12345", -42, 1 div 0)', ZeroDivisionError)
self.check_value('fn:substring("12345", -42, 1 div 0E0)', '12345')
self.check_value('fn:substring("12345", -1 div 0E0, 1 div 0E0)', '')
self.check_value('fn:substring(("alpha"), 1, 3)', 'alp')
self.check_value('fn:substring(("alpha"), (1), 3)', 'alp')
self.check_value('fn:substring(("alpha"), 1, (3))', 'alp')
self.wrong_type('fn:substring(("alpha"), (1, 2), 3)')
self.wrong_type('fn:substring(("alpha", "beta"), 1, 3)')
self.parser.compatibility_mode = True
self.check_value('fn:substring(("alpha", "beta"), 1, 3)', 'alp')
self.check_value('fn:substring("12345", -42, 1 div 0E0)', '12345')
self.check_value('fn:substring("12345", -1 div 0E0, 1 div 0E0)', '')
self.parser.compatibility_mode = False
def test_starts_with_function(self):
root = self.etree.XML(XML_GENERIC_TEST)
self.check_value("starts-with('Hello World', 'Hello')", True)
self.check_value("starts-with('Hello World', 'hello')", False)
self.check_selector("a[starts-with(@id, 'a_i')]", root, [root[0]])
self.check_selector("a[starts-with(@id, 'a_b')]", root, [])
self.check_selector("//b[starts-with(., 'some')]", root, [root[0][0]])
self.check_selector("//b[starts-with(., 'none')]", root, [])
self.check_selector("//none[starts-with(., 'none')]", root, [])
self.check_selector("a[starts-with(@id, 'a_id')]", root, [root[0]])
self.check_selector("a[starts-with(@id, 'a')]", root, [root[0]])
self.check_selector("a[starts-with(@id, 'a!')]", root, [])
self.check_selector("//b[starts-with(., 'some')]", root, [root[0][0]])
self.check_selector("//b[starts-with(., 'a')]", root, [])
self.check_value("starts-with('', '')", True)
self.check_value('fn:starts-with("abracadabra", "abra")', True)
self.check_value('fn:starts-with("abracadabra", "a")', True)
self.check_value('fn:starts-with("abracadabra", "bra")', False)
if self.parser.version == '1.0':
self.wrong_syntax("starts-with((), ())")
self.check_value("starts-with('1999', 19)", True)
else:
self.check_value('fn:starts-with("tattoo", "tat", "http://www.w3.org/'
'2005/xpath-functions/collation/codepoint")', True)
self.check_value('fn:starts-with ("tattoo", "att", "http://www.w3.org/'
'2005/xpath-functions/collation/codepoint")', False)
self.check_value('fn:starts-with ((), ())', True)
self.wrong_type("starts-with('1999', 19)")
self.parser.compatibility_mode = True
self.check_value("starts-with('1999', 19)", True)
self.parser.compatibility_mode = False
def test_concat_function(self):
root = self.etree.XML(XML_GENERIC_TEST)
self.check_value("concat('alpha', 'beta', 'gamma')", 'alphabetagamma')
self.check_value("concat('', '', '')", '')
self.check_value("concat('alpha', 10, 'gamma')", 'alpha10gamma')
self.check_value("concat('alpha', 'beta', 'gamma')", 'alphabetagamma')
self.check_value("concat('alpha', 10, 'gamma')", 'alpha10gamma')
self.check_value("concat('alpha', 'gamma')", 'alphagamma')
self.check_selector("a[concat(@id, '_foo') = 'a_id_foo']", root, [root[0]])
self.check_selector("a[concat(@id, '_fo') = 'a_id_foo']", root, [])
self.check_selector("//b[concat(., '_foo') = 'some content_foo']", root, [root[0][0]])
self.check_selector("//b[concat(., '_fo') = 'some content_foo']", root, [])
self.check_selector("//none[concat(., '_fo') = 'some content_foo']", root, [])
self.wrong_type("concat()", 'XPST0017')
if self.parser.version == '1.0':
self.wrong_syntax("concat((), (), ())")
else:
self.check_value("concat((), (), ())", '')
self.check_value("concat(('a'), (), ('c'))", 'ac')
self.wrong_type("concat(('a', 'b'), (), ('c'))")
self.parser.compatibility_mode = True
self.check_value("concat(('a', 'b'), (), ('c'))", 'ac')
self.parser.compatibility_mode = False
def test_contains_function(self):
root = self.etree.XML(XML_GENERIC_TEST)
self.check_value("contains('XPath','XP')", True)
self.check_value("contains('XP','XPath')", False)
self.check_value("contains('', '')", True)
self.check_selector("a[contains(@id, '_i')]", root, [root[0]])
self.check_selector("a[contains(@id, '_b')]", root, [])
self.check_selector("//b[contains(., 'c')]", root, [root[0][0]])
self.check_selector("//b[contains(., ' -con')]", root, [])
self.check_selector("//none[contains(., ' -con')]", root, [])
if self.parser.version == '1.0':
self.wrong_syntax("contains((), ())")
self.check_value("contains('XPath', 20)", False)
else:
self.check_value('fn:contains ( "tattoo", "t", "http://www.w3.org/'
'2005/xpath-functions/collation/codepoint")', True)
self.check_value('fn:contains ( "tattoo", "ttt", "http://www.w3.org/'
'2005/xpath-functions/collation/codepoint")', False)
self.check_value('fn:contains ( "", ())', True)
self.wrong_type("contains('XPath', 20)")
self.parser.compatibility_mode = True
self.check_value("contains('XPath', 20)", False)
self.parser.compatibility_mode = False
def test_substring_before_function(self):
root = self.etree.XML(XML_GENERIC_TEST)
self.check_value("substring-before('Wolfgang Amadeus Mozart', 'Wolfgang')", '')
self.check_value("substring-before('Wolfgang Amadeus Mozart', 'Amadeus')", 'Wolfgang ')
self.check_value('substring-before("1999/04/01","/")', '1999')
self.check_selector("a[substring-before(@id, 'a') = '']", root, [root[0]])
self.check_selector("a[substring-before(@id, 'id') = 'a_']", root, [root[0]])
self.check_selector("a[substring-before(@id, 'id') = '']", root, [])
self.check_selector("//b[substring-before(., ' ') = 'some']", root, [root[0][0]])
self.check_selector("//b[substring-before(., 'con') = 'some']", root, [])
self.check_selector("//none[substring-before(., 'con') = 'some']", root, [])
if self.parser.version == '1.0':
self.check_value("substring-before('2017-10-27', 10)", '2017-')
self.wrong_syntax("fn:substring-before((), ())")
else:
self.check_value('fn:substring-before ( "tattoo", "attoo", "http://www.w3.org/'
'2005/xpath-functions/collation/codepoint")', 't')
self.check_value('fn:substring-before ( "tattoo", "tatto", "http://www.w3.org/'
'2005/xpath-functions/collation/codepoint")', '')
self.check_value('fn:substring-before ((), ())', '')
self.check_value('fn:substring-before ((), "")', '')
self.wrong_type("substring-before('2017-10-27', 10)")
self.parser.compatibility_mode = True
self.check_value("substring-before('2017-10-27', 10)", '2017-')
self.parser.compatibility_mode = False
def test_substring_after_function(self):
root = self.etree.XML(XML_GENERIC_TEST)
self.check_value("substring-after('Wolfgang Amadeus Mozart', 'Amadeus ')", 'Mozart')
self.check_value("substring-after('Wolfgang Amadeus Mozart', 'Mozart')", '')
self.check_value("substring-after('', '')", '')
self.check_value("substring-after('Mozart', 'B')", '')
self.check_value("substring-after('Mozart', 'Bach')", '')
self.check_value("substring-after('Mozart', 'Amadeus')", '')
self.check_value("substring-after('Mozart', '')", 'Mozart')
self.check_value('substring-after("1999/04/01","/")', '04/01')
self.check_value('substring-after("1999/04/01","19")', '99/04/01')
self.check_value("substring-after('Wolfgang Amadeus Mozart', 'Amadeus ')", 'Mozart')
self.check_value("substring-after('Wolfgang Amadeus Mozart', 'Mozart')", '')
self.check_selector("a[substring-after(@id, 'a') = '_id']", root, [root[0]])
self.check_selector("a[substring-after(@id, 'id') = '']", root, [root[0]])
self.check_selector("a[substring-after(@id, 'i') = '']", root, [])
self.check_selector("//b[substring-after(., ' ') = 'content']", root, [root[0][0]])
self.check_selector("//b[substring-after(., 'con') = 'content']", root, [])
self.check_selector("//none[substring-after(., 'con') = 'content']", root, [])
if self.parser.version == '1.0':
self.wrong_syntax("fn:substring-after((), ())")
else:
self.check_value('fn:substring-after("tattoo", "tat")', 'too')
self.check_value('fn:substring-after("tattoo", "tattoo")', '')
self.check_value("fn:substring-after((), ())", '')
self.wrong_type("substring-after('2017-10-27', 10)")
self.parser.compatibility_mode = True
self.check_value("substring-after('2017-10-27', 10)", '-27')
self.parser.compatibility_mode = False
def test_boolean_functions(self):
self.check_value("true()", True)
self.check_value("false()", False)
self.check_value("not(false())", True)
self.check_value("not(true())", False)
self.check_value("boolean(0)", False)
self.check_value("boolean(1)", True)
self.check_value("boolean(-1)", True)
self.check_value("boolean('hello!')", True)
self.check_value("boolean(' ')", True)
self.check_value("boolean('')", False)
self.wrong_type("true(1)", 'XPST0017', "'true' function has no arguments")
self.wrong_syntax("true(", 'unexpected end of source')
if self.parser.version == '1.0':
self.wrong_syntax("boolean(())")
else:
self.check_value("boolean(())", False)
def test_boolean_context_nonempty_elements(self):
root = self.etree.XML("""<a> <b>text</b> </a>""")
context = XPathContext(root=root)
root_token = self.parser.parse("boolean(node())")
self.assertEqual(True, root_token.evaluate(context))
root_token = self.parser.parse("not(node())")
self.assertEqual(False, root_token.evaluate(context))
root_token = self.parser.parse("not(not(node()))")
self.assertEqual(True, root_token.evaluate(context))
def test_nonempty_elements(self):
root = self.etree.XML("<a> <b>text</b></a>")
context = XPathContext(root=root)
root_token = self.parser.parse("normalize-space(text()) = ''")
self.assertEqual(True, root_token.evaluate(context))
if self.parser.version > '1.0':
with self.assertRaises(ElementPathTypeError) as ctx:
root_token.evaluate(
context=XPathContext(
root=self.etree.XML("<a> <b>text</b> </a>") # Two text nodes ...
)
)
self.assertIn('sequence of more than one item is not allowed', str(ctx.exception))
elements = select(root, "//*")
for element in elements:
context = XPathContext(root=root, item=element)
root_token = self.parser.parse("* or normalize-space(text()) != ''")
self.assertEqual(True, root_token.evaluate(context), element)
def test_lang_function(self):
# From https://www.w3.org/TR/1999/REC-xpath-19991116/#section-Boolean-Functions
root = self.etree.XML('<para xml:lang="en"/>')
self.check_selector('lang("en")', root, True)
root = self.etree.XML('<div xml:lang="en"><para/></div>')
document = self.etree.ElementTree(root)
self.check_selector('lang("en")', root, True)
if self.parser.version > '1.0':
self.check_selector('para/lang("en")', root, True)
context = XPathContext(root)
self.check_value('for $x in . return $x/fn:lang(())',
expected=[], context=context)
else:
context = XPathContext(document, item=root[0])
self.check_value('lang("en")', True, context=context)
self.check_value('lang("it")', False, context=context)
root = self.etree.XML('<a><b><c/></b></a>')
self.check_selector('lang("en")', root, False)
if self.parser.version > '1.0':
self.check_selector('b/c/lang("en")', root, False)
self.check_selector('b/c/lang("en", .)', root, False)
else:
context = XPathContext(root, item=root[0][0])
self.check_value('lang("en")', False, context=context)
self.check_selector('lang("en")', self.etree.XML('<para xml:lang="EN"/>'), True)
self.check_selector('lang("en")', self.etree.XML('<para xml:lang="en-us"/>'), True)
self.check_selector('lang("en")', self.etree.XML('<para xml:lang="it"/>'), False)
self.check_selector('lang("en")', self.etree.XML('<div/>'), False)
document = self.etree.ElementTree(root)
context = XPathContext(root=document)
if self.parser.version == '1.0':
self.check_value('lang("en")', expected=False, context=context)
else:
self.check_value('lang("en")', expected=TypeError, context=context)
context.item = document
self.check_value('for $x in /a/b/c return $x/fn:lang("en")',
expected=[False], context=context)
def test_logical_and_operator(self):
self.check_value("false() and true()", False)
self.check_value("true() and true()", True)
self.check_value("1 and 0", False)
self.check_value("1 and 1", True)
self.check_value("1 and 'jupiter'", True)
self.check_value("0 and 'mars'", False)
self.check_value("1 and mars", MissingContextError)
context = XPathContext(self.etree.XML('<root/>'))
self.check_value("1 and mars", False, context)
def test_logical_or_operator(self):
self.check_value("false() or true()", True)
self.check_value("true() or false()", True)
def test_logical_expressions(self):
root_token = self.parser.parse("(@a and not(@b)) or (not(@a) and @b)")
context = XPathContext(self.etree.XML('<root a="10" b="0"/>'))
self.assertTrue(root_token.evaluate(context=context) is False)
context = XPathContext(self.etree.XML('<root a="10" b="1"/>'))
self.assertTrue(root_token.evaluate(context=context) is False)
context = XPathContext(self.etree.XML('<root a="10"/>'))
self.assertTrue(root_token.evaluate(context=context) is True)
context = XPathContext(self.etree.XML('<root a="0"/>'))
self.assertTrue(root_token.evaluate(context=context) is True)
context = XPathContext(self.etree.XML('<root b="0"/>'))
self.assertTrue(root_token.evaluate(context=context) is True)
context = XPathContext(self.etree.XML('<root/>'))
self.assertTrue(root_token.evaluate(context=context) is False)
def test_comparison_operators(self):
self.check_value("0.05 = 0.05", True)
self.check_value("19.03 != 19.02999", True)
self.check_value("-1.0 = 1.0", False)
self.check_value("1 <= 2", True)
self.check_value("5 >= 9", False)
self.check_value("5 > 3", True)
self.check_value("5 < 20.0", True)
self.check_value("2 * 2 = 4", True)
self.wrong_syntax("5 > 3 < 4", "unexpected '<' operator")
if self.parser.version == '1.0':
self.check_value("false() = 1", False)
self.check_value("0 = false()", True)
else:
self.wrong_type("false() = 1")
self.wrong_type("0 = false()")
self.wrong_value('xs:untypedAtomic("1") = xs:dayTimeDuration("PT1S")',
'FORG0001', "'1' is not an xs:duration value")
def test_comparison_of_sequences(self):
root = self.etree.XML('<table>'
' <unit id="1"><cost>50</cost></unit>'
' <unit id="2"><cost>30</cost></unit>'
' <unit id="3"><cost>20</cost></unit>'
' <unit id="2"><cost>40</cost></unit>'
'</table>')
self.check_selector("/table/unit[2]/cost <= /table/unit[1]/cost", root, True)
self.check_selector("/table/unit[2]/cost > /table/unit[position()!=2]/cost", root, True)
self.check_selector("/table/unit[3]/cost > /table/unit[position()!=3]/cost", root, False)
self.check_selector(". = 'Dickens'", self.etree.XML('<author>Dickens</author>'), True)
def test_numerical_expressions(self):
self.check_value("9", 9)
self.check_value("-3", -3)
self.check_value("7.1", Decimal('7.1'))
self.check_value("0.45e3", 0.45e3)
self.check_value(" 7+5 ", 12)
self.check_value("8 - 5", 3)
self.check_value("-8 - 5", -13)
self.check_value("-3 * 7", -21)
self.check_value("(5 * 7) + 9", 44)
self.check_value("-3 * 7", -21)
self.check_value('(2 + 4) * 5', 30)
self.check_value('2 + 4 * 5', 22)
def test_addition_and_subtraction_operators(self):
# '+' and '-' are both prefix and infix operators. The binding
# power is equal to 40 but the nud() method is set with rbp=70.
self.check_value("9 + 1 + 6", 16)
self.check_tree("9 - 1 + 6", '(+ (- (9) (1)) (6))')
self.check_value("(9 - 1) + 6", 14)
self.check_value("9 - 1 + 6", 14)