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xpath2_functions.py
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xpath2_functions.py
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#
# 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>
#
"""
XPath 2.0 implementation - part 2 (functions)
"""
import math
import datetime
import time
import re
import locale
import os.path
import unicodedata
from copy import copy
from decimal import Decimal, DecimalException
from urllib.parse import urlsplit, quote as urllib_quote
from ..datatypes import QNAME_PATTERN, DateTime10, DateTime, Date10, Date, \
Float10, DoubleProxy, Time, Duration, DayTimeDuration, YearMonthDuration, \
UntypedAtomic, AnyURI, QName, NCName, Id, is_idrefs, ArithmeticProxy, NumericProxy
from ..namespaces import XML_NAMESPACE, get_namespace, split_expanded_name, XML_ID, XML_LANG
from ..xpath_context import XPathContext, XPathSchemaContext
from ..xpath_nodes import AttributeNode, NamespaceNode, is_element_node, \
is_document_node, is_xpath_node, node_name, node_nilled, node_base_uri, \
node_document_uri, node_kind, etree_deep_equal
from ..regex import RegexError, translate_pattern
from .xpath2_parser import XPath2Parser
method = XPath2Parser.method
function = XPath2Parser.function
###
# Sequence types (allowed only for type checking in treat-as/instance-of statements)
function('empty-sequence', nargs=0, label='sequence type')
@method(function('item', nargs=0, label='sequence type'))
def evaluate(self, context=None):
if context is None:
raise self.missing_context()
return context.root if context.item is None else context.item
###
# Function for QNames
@method(function('prefix-from-QName', nargs=1))
def evaluate(self, context=None):
qname = self.get_argument(context)
if qname is None:
return
elif not isinstance(qname, QName):
raise self.error('XPTY0004', 'argument has an invalid type %r' % type(qname))
return qname.prefix or []
@method(function('local-name-from-QName', nargs=1))
def evaluate(self, context=None):
qname = self.get_argument(context)
if qname is None:
return
elif not isinstance(qname, QName):
raise self.error('XPTY0004', 'argument has an invalid type %r' % type(qname))
return NCName(qname.local_name)
@method(function('namespace-uri-from-QName', nargs=1))
def evaluate(self, context=None):
qname = self.get_argument(context)
if qname is None:
return
elif not isinstance(qname, QName):
raise self.error('XPTY0004', 'argument has an invalid type %r' % type(qname))
return AnyURI(qname.uri or '')
@method(function('namespace-uri-for-prefix', nargs=2))
def evaluate(self, context=None):
if context is None:
raise self.missing_context()
prefix = self.get_argument(context=copy(context))
if prefix is None:
prefix = ''
if not isinstance(prefix, str):
raise self.error('FORG0006', '1st argument has an invalid type %r' % type(prefix))
elem = self.get_argument(context, index=1)
if not is_element_node(elem):
raise self.error('FORG0006', '2nd argument %r is not an element node' % elem)
ns_uris = {get_namespace(e.tag) for e in elem.iter()}
for p, uri in self.parser.namespaces.items():
if uri in ns_uris:
if p == prefix:
if not prefix or uri:
return AnyURI(uri)
else:
msg = 'Prefix %r is associated to no namespace'
raise self.error('XPST0081', msg % prefix)
@method(function('in-scope-prefixes', nargs=1))
def select(self, context=None):
if context is None:
raise self.missing_context()
elem = self.get_argument(context)
if not is_element_node(elem):
raise self.error('XPTY0004', 'argument %r is not an element node' % elem)
if isinstance(context, XPathSchemaContext):
# For schema context returns prefixes of static namespaces
yield from self.parser.namespaces
elif hasattr(elem, 'nsmap'):
# For lxml returns Element's prefixes
yield 'xml'
yield from filter(lambda x: x and x != 'xml', elem.nsmap)
else:
# For ElementTree returns module registered prefixes
prefixes = {'xml'} # 'xml' prefix is always registered
prefixes.update(x for x in self.parser.namespaces if x)
if context.namespaces:
prefixes.update(x for x in context.namespaces if x)
yield from prefixes
@method(function('resolve-QName', nargs=2))
def evaluate(self, context=None):
qname = self.get_argument(context=copy(context))
if qname is None:
return
elif not isinstance(qname, str):
raise self.error('FORG0006', '1st argument has an invalid type %r' % type(qname))
if context is None:
raise self.missing_context()
elem = self.get_argument(context, index=1)
if not is_element_node(elem):
raise self.error('FORG0006', '2nd argument %r is not an element node' % elem)
qname = qname.strip()
match = QNAME_PATTERN.match(qname)
if match is None:
raise self.error('FOCA0002', '1st argument must be an xs:QName')
prefix = match.groupdict()['prefix'] or ''
if prefix == 'xml':
return QName(XML_NAMESPACE, qname)
try:
nsmap = {**self.parser.namespaces, **elem.nsmap}
except AttributeError:
nsmap = self.parser.namespaces
for pfx, uri in nsmap.items():
if pfx == prefix:
if pfx:
return QName(uri, '{}:{}'.format(pfx, match.groupdict()['local']))
else:
return QName(uri, match.groupdict()['local'])
if prefix or '' in self.parser.namespaces:
raise self.error('FONS0004', 'no namespace found for prefix %r' % prefix)
return QName('', qname)
###
# Accessor functions
@method(function('node-name', nargs=1))
def evaluate(self, context=None):
arg = self.get_argument(context)
if arg is None:
return
elif not is_xpath_node(arg):
raise self.error('XPTY0004', 'an XPath node required')
name = node_name(arg)
if name is None:
return
elif name.startswith('{'):
# name is a QName in extended format
namespace, local_name = split_expanded_name(name)
for pfx, uri in self.parser.namespaces.items():
if uri == namespace:
return QName(uri, '{}:{}'.format(pfx, local_name))
raise self.error('FONS0004', 'no prefix found for namespace {}'.format(namespace))
else:
# name is a local name
return QName(self.parser.namespaces.get('', ''), name)
@method(function('nilled', nargs=1))
def evaluate(self, context=None):
arg = self.get_argument(context)
if arg is None:
return
elif not is_xpath_node(arg):
raise self.error('XPTY0004', 'an XPath node required')
return node_nilled(arg)
@method(function('data', nargs=1))
def select(self, context=None):
for item in self[0].select(context):
value = self.data_value(item)
if value is None:
raise self.error('FOTY0012', "argument node does not have a typed value")
else:
yield value
@method(function('base-uri', nargs=(0, 1)))
def evaluate(self, context=None):
item = self.get_argument(context, default_to_context=True)
if context is None:
raise self.missing_context("context item is undefined")
elif item is None:
return
elif not is_xpath_node(item):
raise self.wrong_context_type("context item is not a node")
else:
return node_base_uri(item)
@method(function('document-uri', nargs=1))
def evaluate(self, context=None):
if context is None:
raise self.missing_context()
arg = self.get_argument(context)
if arg is None or not is_document_node(arg):
return
uri = node_document_uri(arg)
if uri is not None:
return uri
elif is_document_node(context.root):
try:
for uri, doc in context.documents.items():
if doc is context.root:
return uri
except AttributeError:
pass
###
# Number functions
@method(function('round-half-to-even', nargs=(1, 2)))
def evaluate(self, context=None):
item = self.get_argument(context)
if item is None:
return
elif isinstance(item, float) and (math.isnan(item) or math.isinf(item)):
return item
elif not isinstance(item, (float, int, Decimal)):
code = 'XPTY0004' if isinstance(item, str) else 'FORG0006'
raise self.error(code, "invalid argument type {!r}".format(type(item)))
precision = 0 if len(self) < 2 else self[1].evaluate(context)
try:
if isinstance(item, int):
return round(item, precision)
elif isinstance(item, Decimal):
return round(item, precision)
elif isinstance(item, Float10):
return Float10(round(item, precision))
return float(round(Decimal.from_float(item), precision))
except TypeError as err:
raise self.error('XPTY0004', err)
except DecimalException:
if isinstance(item, Decimal):
return Decimal.from_float(round(float(item), precision))
return round(item, precision)
@method(function('abs', nargs=1))
def evaluate(self, context=None):
item = self.get_argument(context)
if item is None:
return
elif isinstance(item, float) and math.isnan(item):
return item
elif is_xpath_node(item):
value = self.string_value(item)
try:
return abs(Decimal(value))
except DecimalException:
raise self.error('FOCA0002', "invalid string value {!r} for {!r}".format(value, item))
elif isinstance(item, bool) or not isinstance(item, (float, int, Decimal)):
raise self.error('XPTY0004', "invalid argument type {!r}".format(type(item)))
else:
return abs(item)
###
# Aggregate functions
@method(function('avg', nargs=1))
def evaluate(self, context=None):
values = []
for item in self[0].select_data_values(context):
if isinstance(item, UntypedAtomic):
values.append(self.cast_to_double(item.value))
elif isinstance(item, (AnyURI, bool)):
raise self.error('FORG0006', 'non numeric value {!r} in the sequence'.format(item))
else:
values.append(item)
if not values:
return
elif isinstance(values[0], Duration):
value = values[0]
try:
for item in values[1:]:
value = value + item
return value / len(values)
except TypeError as err:
raise self.error('FORG0006', err)
elif all(isinstance(x, int) for x in values):
result = sum(values) / Decimal(len(values))
return int(result) if result % 1 == 0 else result
elif all(isinstance(x, (int, Decimal)) for x in values):
return sum(values) / Decimal(len(values))
elif all(not isinstance(x, DoubleProxy) for x in values):
try:
return sum(Float10(x) if isinstance(x, Decimal) else x for x in values) / len(values)
except TypeError as err:
raise self.error('FORG0006', err)
else:
try:
return sum(float(x) if isinstance(x, Decimal) else x for x in values) / len(values)
except TypeError as err:
raise self.error('FORG0006', err)
@method(function('max', nargs=(1, 2)))
@method(function('min', nargs=(1, 2)))
def evaluate(self, context=None):
def max_or_min():
if not values:
return values
elif any(isinstance(x, str) for x in values):
if any(isinstance(x, ArithmeticProxy) for x in values):
raise self.error('FORG0006', "cannot compare strings with numeric data")
elif all(isinstance(x, (Decimal, int)) for x in values):
return aggregate_func(values)
elif any(isinstance(x, float) and math.isnan(x) for x in values):
return float_class('NaN')
elif all(isinstance(x, (int, float, Decimal)) for x in values):
return float_class(aggregate_func(values))
return aggregate_func(values)
values = []
float_class = None
aggregate_func = max if self.symbol == 'max' else min
for item in self[0].select_data_values(context):
if isinstance(item, UntypedAtomic):
values.append(self.cast_to_double(item))
float_class = float
elif isinstance(item, float):
values.append(item)
if float_class is None:
float_class = type(item)
elif float_class is Float10 and not isinstance(item, Float10):
float_class = float
elif isinstance(item, AnyURI):
values.append(item.value)
elif isinstance(item, (DayTimeDuration, YearMonthDuration)):
values.append(item)
elif isinstance(item, (Duration, QName)):
raise self.error('FORG0006', "xs:{} is not an ordered type".format(type(item).name))
else:
values.append(item)
try:
if len(self) > 1:
with self.use_locale(collation=self.get_argument(context, 1)):
return max_or_min()
return max_or_min()
except TypeError as err:
raise self.error('FORG0006', err)
###
# General functions for sequences
@method(function('empty', nargs=1))
@method(function('exists', nargs=1))
def evaluate(self, context=None):
return next(iter(self.select(context)))
@method('empty')
def select(self, context=None):
try:
next(iter(self[0].select(context)))
except StopIteration:
yield True
else:
yield False
@method('exists')
def select(self, context=None):
try:
next(iter(self[0].select(context)))
except StopIteration:
yield False
else:
yield True
@method(function('distinct-values', nargs=(1, 2)))
def select(self, context=None):
def distinct_values():
nan = False
results = []
for item in self[0].select(context):
value = self.data_value(item)
if context is not None:
context.item = value
if isinstance(value, (float, Decimal)):
if math.isnan(value):
if not nan:
yield value
nan = True
elif all(not math.isclose(value, x, rel_tol=1E-7, abs_tol=0)
for x in results if isinstance(x, (int, Decimal, float))):
yield value
results.append(value)
elif value not in results:
yield value
results.append(value)
if len(self) > 1:
with self.use_locale(collation=self.get_argument(context, 1)):
yield from distinct_values()
else:
yield from distinct_values()
@method(function('insert-before', nargs=3))
def select(self, context=None):
try:
insert_at_pos = max(0, self[1].value - 1)
except TypeError:
raise self.error('XPTY0004', '2nd argument must be an xs:integer') from None
inserted = False
for pos, result in enumerate(self[0].select(context)):
if not inserted and pos == insert_at_pos:
yield from self[2].select(context)
inserted = True
yield result
if not inserted:
yield from self[2].select(context)
@method(function('index-of', nargs=(2, 3)))
def select(self, context=None):
value = self[1].get_atomized_operand(copy(context))
if value is None:
raise self.error('XPTY0004', "2nd argument cannot be an empty sequence")
if len(self) < 3:
for pos, result in enumerate(self[0].select(context), start=1):
if self.data_value(result) == value:
yield pos
else:
with self.use_locale(collation=self.get_argument(context, 2)):
for pos, result in enumerate(self[0].select(context), start=1):
if self.data_value(result) == value:
yield pos
@method(function('remove', nargs=2))
def select(self, context=None):
position = self[1].evaluate(context)
if not isinstance(position, int):
raise self.error('XPTY0004', 'an xs:integer required')
for pos, result in enumerate(self[0].select(context), start=1):
if pos != position:
yield result
@method(function('reverse', nargs=1))
def select(self, context=None):
yield from reversed([x for x in self[0].select(context)])
@method(function('subsequence', nargs=(2, 3)))
def select(self, context=None):
starting_loc = self.get_argument(context, 1, cls=NumericProxy)
if not math.isnan(starting_loc) and not math.isinf(starting_loc):
starting_loc = round(starting_loc)
if len(self) == 2:
for pos, result in enumerate(self[0].select(context), start=1):
if starting_loc <= pos:
yield result
else:
length = self.get_argument(context, 2, cls=NumericProxy)
if not math.isnan(length) and not math.isinf(length):
length = round(length)
for pos, result in enumerate(self[0].select(context), start=1):
if starting_loc <= pos < starting_loc + length:
yield result
@method(function('unordered', nargs=1))
def select(self, context=None):
yield from sorted([x for x in self[0].select(context)], key=lambda x: self.string_value(x))
###
# Cardinality functions for sequences
@method(function('zero-or-one', nargs=1))
def select(self, context=None):
results = iter(self[0].select(context))
try:
item = next(results)
except StopIteration:
return
try:
next(results)
except StopIteration:
yield item
else:
raise self.error('FORG0003')
@method(function('one-or-more', nargs=1))
def select(self, context=None):
results = iter(self[0].select(context))
try:
item = next(results)
except StopIteration:
raise self.error('FORG0004') from None
else:
yield item
while True:
try:
yield next(results)
except StopIteration:
break
@method(function('exactly-one', nargs=1))
def select(self, context=None):
results = iter(self[0].select(context))
try:
item = next(results)
except StopIteration:
raise self.error('FORG0005') from None
else:
try:
next(results)
except StopIteration:
yield item
else:
raise self.error('FORG0005')
###
# Comparing sequences
@method(function('deep-equal', nargs=(2, 3)))
def evaluate(self, context=None):
def deep_equal():
while True:
value1 = next(seq1, None)
value2 = next(seq2, None)
if (value1 is None) ^ (value2 is None):
return False
elif value1 is None:
return True
elif (is_xpath_node(value1)) ^ (is_xpath_node(value2)):
return False
elif not is_xpath_node(value1):
try:
if isinstance(value1, bool):
if not isinstance(value2, bool) or value1 is not value2:
return False
elif isinstance(value2, bool):
return False
elif isinstance(value1, UntypedAtomic):
if not isinstance(value2, UntypedAtomic) or value1 != value2:
return False
elif isinstance(value2, UntypedAtomic):
return False
elif isinstance(value1, float):
if math.isnan(value1):
if not math.isnan(value2):
return False
elif isinstance(value2, Decimal):
if value1 != float(value2):
return False
elif value1 != value2:
return False
elif isinstance(value2, float):
if math.isnan(value2):
return False
elif isinstance(value1, Decimal):
if value2 != float(value1):
return False
elif value1 != value2:
return False
elif value1 != value2:
return False
except TypeError:
return False
elif node_kind(value1) != node_kind(value2):
return False
elif is_element_node(value1):
if not etree_deep_equal(value1, value2):
return False
elif value1.value != value2.value:
return False
elif isinstance(value1, AttributeNode):
if value1.name != value2.name:
return False
elif isinstance(value1, NamespaceNode):
if value1.prefix != value2.prefix:
return False
seq1 = iter(self[0].select(copy(context)))
seq2 = iter(self[1].select(copy(context)))
if len(self) > 2:
with self.use_locale(collation=self.get_argument(context, 2)):
return deep_equal()
else:
return deep_equal()
###
# Regex
@method(function('matches', nargs=(2, 3)))
def evaluate(self, context=None):
input_string = self.get_argument(context, default='', cls=str)
pattern = self.get_argument(context, 1, required=True, cls=str)
flags = 0
if len(self) > 2:
for c in self.get_argument(context, 2, required=True, cls=str):
if c in 'smix':
flags |= getattr(re, c.upper())
else:
raise self.error('FORX0001', "Invalid regular expression flag %r" % c)
try:
python_pattern = translate_pattern(pattern, flags, self.parser.xsd_version)
return re.search(python_pattern, input_string, flags=flags) is not None
except (re.error, RegexError) as err:
msg = "Invalid regular expression: {}"
raise self.error('FORX0002', msg.format(str(err))) from None
except OverflowError as err:
raise self.error('FORX0002', err) from None
REPLACEMENT_PATTERN = re.compile(r'^([^\\$]|[\\]{2}|\\\$|\$\d+)*$')
@method(function('replace', nargs=(3, 4)))
def evaluate(self, context=None):
input_string = self.get_argument(context, default='', cls=str)
pattern = self.get_argument(context, 1, required=True, cls=str)
replacement = self.get_argument(context, 2, required=True, cls=str)
flags = 0
if len(self) > 3:
for c in self.get_argument(context, 3, required=True, cls=str):
if c in 'smix':
flags |= getattr(re, c.upper())
else:
raise self.error('FORX0001', "Invalid regular expression flag %r" % c)
try:
python_pattern = translate_pattern(pattern, flags, self.parser.xsd_version)
pattern = re.compile(python_pattern, flags=flags)
except (re.error, RegexError):
raise self.error('FORX0002', "Invalid regular expression %r" % pattern)
else:
if pattern.search(''):
msg = "Regular expression %r matches zero-length string"
raise self.error('FORX0003', msg % pattern.pattern)
elif REPLACEMENT_PATTERN.search(replacement) is None:
raise self.error('FORX0004', "Invalid replacement string %r" % replacement)
else:
for g in range(pattern.groups, -1, -1):
if '$%d' % g in replacement:
replacement = re.sub(r'(?<!\\)\$%d' % g, r'\\g<%d>' % g, replacement)
return pattern.sub(replacement, input_string).replace('\\$', '$')
@method(function('tokenize', nargs=(2, 3)))
def select(self, context=None):
input_string = self.get_argument(context, cls=str)
pattern = self.get_argument(context, 1, required=True, cls=str)
flags = 0
if len(self) > 2:
for c in self.get_argument(context, 2, required=True, cls=str):
if c in 'smix':
flags |= getattr(re, c.upper())
else:
raise self.error('FORX0001', "Invalid regular expression flag %r" % c)
try:
python_pattern = translate_pattern(pattern, flags, self.parser.xsd_version)
pattern = re.compile(python_pattern, flags=flags)
except (re.error, RegexError):
raise self.error('FORX0002', "Invalid regular expression %r" % pattern) from None
else:
if pattern.search(''):
msg = "Regular expression %r matches zero-length string"
raise self.error('FORX0003', msg % pattern.pattern)
if input_string:
for value in pattern.split(input_string):
if value is not None and pattern.search(value) is None:
yield value
###
# Functions on anyURI
@method(function('resolve-uri', nargs=(1, 2)))
def evaluate(self, context=None):
relative = self.get_argument(context, cls=str)
if len(self) == 1:
if self.parser.base_uri is None:
raise self.error('FONS0005')
elif relative is None:
return
elif not AnyURI.is_valid(relative):
raise self.error('FORG0002', '{!r} is not a valid URI'.format(relative))
else:
return self.get_absolute_uri(relative)
base_uri = self.get_argument(context, index=1, required=True, cls=str)
if not AnyURI.is_valid(base_uri):
raise self.error('FORG0002', '{!r} is not a valid URI'.format(base_uri))
elif relative is None:
return
elif not AnyURI.is_valid(relative):
raise self.error('FORG0002', '{!r} is not a valid URI'.format(relative))
else:
return self.get_absolute_uri(relative, base_uri)
###
# String functions
@method(function('codepoints-to-string', nargs=1))
def evaluate(self, context=None):
def xml10_chr(cp: int):
if not isinstance(cp, int):
raise TypeError("invalid type {} for codepoint {}".format(type(cp), cp))
elif cp in {0x9, 0xA, 0xD} \
or 0x20 <= cp <= 0xD7FF \
or 0xE000 <= cp <= 0xFFFD \
or 0x10000 <= cp <= 0x10FFFF:
return chr(cp)
raise ValueError("{} is not a valid XML 1.0 codepoint".format(cp))
try:
return ''.join(xml10_chr(cp) for cp in self[0].select(context))
except TypeError as err:
code = 'XPTY0004' if "'str'" in str(err) else 'FORG0006'
raise self.error(code, err) from None
except ValueError as err:
raise self.error('FOCH0001', err) from None # Code point not valid
@method(function('string-to-codepoints', nargs=1))
def evaluate(self, context=None):
try:
return [ord(c) for c in self[0].evaluate(context)] or None
except TypeError:
raise self.error('XPTY0004', 'an xs:string required') from None
@method(function('compare', nargs=(2, 3)))
def evaluate(self, context=None):
comp1 = self.get_argument(context, 0, cls=str, promote=(AnyURI, UntypedAtomic))
comp2 = self.get_argument(context, 1, cls=str, promote=(AnyURI, UntypedAtomic))
if comp1 is None or comp2 is None:
return
if len(self) < 3:
value = locale.strcoll(comp1, comp2)
else:
with self.use_locale(collation=self.get_argument(context, 2)):
value = locale.strcoll(comp1, comp2)
return 0 if not value else 1 if value > 0 else -1
@method(function('contains', nargs=(2, 3)))
def evaluate(self, context=None):
arg1 = self.get_argument(context, default='', cls=str)
arg2 = self.get_argument(context, index=1, default='', cls=str)
if len(self) < 3:
return arg2 in arg1
else:
with self.use_locale(collation=self.get_argument(context, 2)):
return arg2 in arg1
@method(function('codepoint-equal', nargs=2))
def evaluate(self, context=None):
comp1 = self.get_argument(context, 0, cls=str)
comp2 = self.get_argument(context, 1, cls=str)
if comp1 is None or comp2 is None:
return
elif len(comp1) != len(comp2):
return False
else:
return all(ord(c1) == ord(c2) for c1, c2 in zip(comp1, comp2))
@method(function('string-join', nargs=(1, 2)))
def evaluate(self, context=None):
items = [self.string_value(s) for s in self[0].select(context)]
return self.get_argument(context, 1, required=True, cls=str).join(items)
@method(function('normalize-unicode', nargs=(1, 2)))
def evaluate(self, context=None):
arg = self.get_argument(context, default='', cls=str)
if len(self) > 1:
normalization_form = self.get_argument(context, 1, cls=str)
if normalization_form is None:
raise self.error('XPTY0004', "2nd argument can't be an empty sequence")
else:
normalization_form = normalization_form.strip().upper()
else:
normalization_form = 'NFC'
if normalization_form == 'FULLY-NORMALIZED':
msg = "%r normalization form not supported" % normalization_form
raise self.error('FOCH0003', msg)
if not arg:
return ''
elif not normalization_form:
return arg
try:
return unicodedata.normalize(normalization_form, arg)
except ValueError:
msg = "unsupported normalization form %r" % normalization_form
raise self.error('FOCH0003', msg) from None
@method(function('upper-case', nargs=1))
def evaluate(self, context=None):
return self.get_argument(context, default='', cls=str).upper()
@method(function('lower-case', nargs=1))
def evaluate(self, context=None):
return self.get_argument(context, default='', cls=str).lower()
@method(function('encode-for-uri', nargs=1))
def evaluate(self, context=None):
uri_part = self.get_argument(context, cls=str)
return '' if uri_part is None else urllib_quote(uri_part, safe='~')
@method(function('iri-to-uri', nargs=1))
def evaluate(self, context=None):
iri = self.get_argument(context, cls=str, promote=AnyURI)
return '' if iri is None else urllib_quote(iri, safe='-_.!~*\'()#;/?:@&=+$,[]%')
@method(function('escape-html-uri', nargs=1))
def evaluate(self, context=None):
uri = self.get_argument(context, cls=str)
if uri is None:
return ''
return urllib_quote(uri, safe=''.join(chr(cp) for cp in range(32, 127)))
@method(function('starts-with', nargs=(2, 3)))
def evaluate(self, context=None):
arg1 = self.get_argument(context, default='', cls=str)
arg2 = self.get_argument(context, index=1, default='', cls=str)
if len(self) < 3:
return arg1.startswith(arg2)
else:
with self.use_locale(collation=self.get_argument(context, 2)):
return arg1.startswith(arg2)
@method(function('ends-with', nargs=(2, 3)))
def evaluate(self, context=None):
arg1 = self.get_argument(context, default='', cls=str)
arg2 = self.get_argument(context, index=1, default='', cls=str)
if len(self) < 3:
return arg1.endswith(arg2)
else:
with self.use_locale(collation=self.get_argument(context, 2)):
return arg1.endswith(arg2)
@method(function('substring-before', nargs=(2, 3)))
@method(function('substring-after', nargs=(2, 3)))
def evaluate(self, context=None):
arg1 = self.get_argument(context, default='', cls=str)
arg2 = self.get_argument(context, index=1, default='', cls=str)
if len(self) < 3:
index = arg1.find(arg2)
else:
with self.use_locale(collation=self.get_argument(context, 2)):
index = arg1.find(arg2)
if index < 0:
return ''
if self.symbol == 'substring-before':
return arg1[:index]
else:
return arg1[index + len(arg2):]
###
# Functions on durations, dates and times
@method(function('years-from-duration', nargs=1))
def evaluate(self, context=None):
item = self.get_argument(context, cls=Duration)
if item is None:
return
else:
return item.months // 12 if item.months >= 0 else -(abs(item.months) // 12)
@method(function('months-from-duration', nargs=1))
def evaluate(self, context=None):
item = self.get_argument(context, cls=Duration)
if item is None:
return
else:
return item.months % 12 if item.months >= 0 else -(abs(item.months) % 12)
@method(function('days-from-duration', nargs=1))
def evaluate(self, context=None):
item = self.get_argument(context, cls=Duration)
if item is None:
return
else:
return item.seconds // 86400 if item.seconds >= 0 else -(abs(item.seconds) // 86400)
@method(function('hours-from-duration', nargs=1))
def evaluate(self, context=None):
item = self.get_argument(context, cls=Duration)
if item is None:
return
else:
return item.seconds // 3600 % 24 if item.seconds >= 0 else -(abs(item.seconds) // 3600 % 24)
@method(function('minutes-from-duration', nargs=1))
def evaluate(self, context=None):
item = self.get_argument(context, cls=Duration)
if item is None:
return
else:
return item.seconds // 60 % 60 if item.seconds >= 0 else -(abs(item.seconds) // 60 % 60)
@method(function('seconds-from-duration', nargs=1))
def evaluate(self, context=None):
item = self.get_argument(context, cls=Duration)
if item is None:
return
else:
return item.seconds % 60 if item.seconds >= 0 else -(abs(item.seconds) % 60)