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#coding:utf-8
# Author: mozman --<mozman@gmx.at>
# Purpose: validator2 module - new validator module
# Created: 01.10.2010
# Copyright (C) 2010, Manfred Moitzi
# License: MIT License
from svgwrite.data import full11
from svgwrite.data import tiny12
from svgwrite.data import pattern
validator_cache = {}
def cache_key(profile, debug):
return str(profile) + str(debug)
def get_validator(profile, debug=True):
""" Validator factory """
try:
return validator_cache[cache_key(profile, debug)]
except KeyError:
if profile == 'tiny':
validator = Tiny12Validator(debug)
elif profile in ('full', 'basic', 'none'):
validator = Full11Validator(debug)
else:
raise ValueError("Unsupported profile: '%s'" % profile)
validator_cache[cache_key(profile, debug)] = validator
return validator
class Tiny12Validator(object):
profilename = "Tiny 1.2"
def __init__(self, debug=True):
self.debug = debug
self.attributes = tiny12.attributes
self.elements = tiny12.elements
self.typechecker = tiny12.TypeChecker()
def check_all_svg_attribute_values(self, elementname, attributes):
"""
Check if attributes are valid for object 'elementname' and all svg
attributes have valid types and values.
Raises ValueError.
"""
for attributename, value in attributes.items():
self.check_svg_attribute_value(elementname, attributename, value)
def check_svg_attribute_value(self, elementname, attributename, value):
"""
Check if 'attributename' is valid for object 'elementname' and 'value'
is a valid svg type and value.
Raises ValueError.
"""
self._check_valid_svg_attribute_name(elementname, attributename)
self._check_svg_value(elementname, attributename, value)
def _check_svg_value(self, elementname, attributename, value):
"""
Checks if 'value' is a valid svg-type for svg-attribute
'attributename' at svg-element 'elementname'.
Raises TypeError.
"""
attribute = self.attributes[attributename]
# check if 'value' match a valid datatype
for typename in attribute.get_types(elementname):
if self.typechecker.check(typename, value):
return
# check if 'value' is a valid constant
valuestr = str(value)
if not valuestr in attribute.get_const(elementname):
raise TypeError("'%s' is not a valid value for attribute '%s' at svg-element <%s>." % (value, attributename, elementname))
def _check_valid_svg_attribute_name(self, elementname, attributename):
""" Check if 'attributename' is a valid svg-attribute for svg-element
'elementname'.
Raises ValueError.
"""
if not self.is_valid_svg_attribute(elementname, attributename):
raise ValueError("Invalid attribute '%s' for svg-element <%s>." % (attributename, elementname))
def _get_element(self, elementname):
try:
return self.elements[elementname]
except KeyError:
raise KeyError("<%s> is not valid for selected profile: '%s'." % (elementname, self.profilename))
def check_svg_type(self, value, typename='string'):
"""
Check if 'value' matches svg type 'typename'.
Raises TypeError.
"""
if self.typechecker.check(typename, value):
return value
else:
raise TypeError("%s is not of type '%s'." % (value, typename))
def is_valid_svg_type(self, value, typename):
return self.typechecker.check(typename, value)
def is_valid_elementname(self, elementname):
""" True if 'elementname' is a valid svg-element name. """
return elementname in self.elements
def is_valid_svg_attribute(self, elementname, attributename):
""" True if 'attributename' is a valid svg-attribute for svg-element
'elementname'.
"""
element = self._get_element(elementname)
return attributename in element.valid_attributes
def is_valid_children(self, elementname, childrenname):
""" True if svg-element 'childrenname' is a valid children of
svg-element 'elementname'.
"""
element = self._get_element(elementname)
return childrenname in element.valid_children
def check_valid_children(self, elementname, childrenname):
""" Checks if svg-element 'childrenname' is a valid children of
svg-element 'elementname'.
Raises ValueError.
"""
if not self.is_valid_children(elementname, childrenname):
raise ValueError("Invalid children '%s' for svg-element <%s>." % (childrenname, elementname))
def get_coordinate(self, value):
""" Split value in (number, unit) if value has an unit or (number, None).
Raises ValueError.
"""
if value is None:
raise TypeError("Invalid type 'None'.")
if isinstance(value, (int, float)):
result = (value, None)
else:
result = pattern.coordinate.match(value.strip())
if result:
number, tmp, unit = result.groups()
number = float(number)
else:
raise ValueError("'%s' is not a valid svg-coordinate." % value)
result = (number, unit)
if self.typechecker.is_number(result[0]):
return result
else:
version = "SVG %s %s" % self.typechecker.get_version()
raise ValueError("%s is not a valid number for: %s." % (value, version))
get_length = get_coordinate
class Full11Validator(Tiny12Validator):
profilename = "Full 1.1"
def __init__(self, debug=True):
self.debug = debug
self.attributes = full11.attributes
self.elements = full11.elements
self.typechecker = full11.TypeChecker()