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svgwrite
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base.py
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#!/usr/bin/env python #coding:utf-8 # Author: mozman # Purpose: svg base element # Created: 08.09.2010 # Copyright (c) 2010-2020, Manfred Moitzi # License: MIT License """ The **BaseElement** is the root for all SVG elements. """ from svgwrite.etree import etree import copy from svgwrite.params import Parameter from svgwrite.utils import AutoID class BaseElement(object): """ The **BaseElement** is the root for all SVG elements. The SVG attributes are stored in **attribs**, and the SVG subelements are stored in **elements**. """ elementname = 'baseElement' def __init__(self, **extra): """ :param extra: extra SVG attributes (keyword arguments) * add trailing '_' to reserved keywords: ``'class_'``, ``'from_'`` * replace inner '-' by '_': ``'stroke_width'`` SVG attribute names will be checked, if **debug** is `True`. workaround for removed **attribs** parameter in Version 0.2.2:: # replace element = BaseElement(attribs=adict) #by element = BaseElement() element.update(adict) """ # the keyword 'factory' specifies the object creator factory = extra.pop('factory', None) if factory is not None: # take parameter from 'factory' self._parameter = factory._parameter else: # default parameter debug=True profile='full' self._parameter = Parameter() # override debug setting debug = extra.pop('debug', None) if debug is not None: self._parameter.debug = debug # override profile setting profile = extra.pop('profile', None) if profile is not None: self._parameter.profile = profile self.attribs = dict() self.update(extra) self.elements = list() def update(self, attribs): """ Update SVG Attributes from `dict` attribs. Rules for keys: 1. trailing '_' will be removed (``'class_'`` -> ``'class'``) 2. inner '_' will be replaced by '-' (``'stroke_width'`` -> ``'stroke-width'``) """ for key, value in attribs.items(): # remove trailing underscores # and replace inner underscores key = key.rstrip('_').replace('_', '-') self.__setitem__(key, value) def copy(self): newobj = copy.copy(self) # shallow copy of object newobj.attribs = copy.copy(self.attribs) # shallow copy of attributes newobj.elements = copy.copy(self.elements) # shallow copy of subelements if 'id' in newobj.attribs: # create a new 'id' newobj['id'] = newobj.next_id() return newobj @property def debug(self): return self._parameter.debug @property def profile(self): return self._parameter.profile @property def validator(self): return self._parameter.validator @validator.setter def validator(self, value): self._parameter.validator = value @property def version(self): return self._parameter.get_version() def set_parameter(self, parameter): self._parameter = parameter def next_id(self, value=None): return AutoID.next_id(value) def get_id(self): """ Get the object `id` string, if the object does not have an `id`, a new `id` will be created. :returns: `string` """ if 'id' not in self.attribs: self.attribs['id'] = self.next_id() return self.attribs['id'] def get_iri(self): """ Get the `IRI` reference string of the object. (i.e., ``'#id'``). :returns: `string` """ return "#%s" % self.get_id() def get_funciri(self): """ Get the `FuncIRI` reference string of the object. (i.e. ``'url(#id)'``). :returns: `string` """ return "url(%s)" % self.get_iri() def __getitem__(self, key): """ Get SVG attribute by `key`. :param string key: SVG attribute name :return: SVG attribute value """ return self.attribs[key] def __setitem__(self, key, value): """ Set SVG attribute by `key` to `value`. :param string key: SVG attribute name :param object value: SVG attribute value """ # Attribute checking is only done by using the __setitem__() method or # by self['attribute'] = value if self.debug: self.validator.check_svg_attribute_value(self.elementname, key, value) self.attribs[key] = value def add(self, element): """ Add an SVG element as subelement. :param element: append this SVG element :returns: the added element """ if self.debug: self.validator.check_valid_children(self.elementname, element.elementname) self.elements.append(element) return element def tostring(self): """ Get the XML representation as unicode `string`. :return: unicode XML string of this object and all its subelements """ xml = self.get_xml() # required for Python 2 support xml_utf8_str = etree.tostring(xml, encoding='utf-8') return xml_utf8_str.decode('utf-8') # just Python 3: return etree.tostring(xml, encoding='unicode') def _repr_svg_(self): """ Show SVG in IPython, Jupyter Notebook, and Jupyter Lab :return: unicode XML string of this object and all its subelements """ return self.tostring() def get_xml(self): """ Get the XML representation as `ElementTree` object. :return: XML `ElementTree` of this object and all its subelements """ xml = etree.Element(self.elementname) if self.debug: self.validator.check_all_svg_attribute_values(self.elementname, self.attribs) for attribute, value in sorted(self.attribs.items()): # filter 'None' values if value is not None: value = self.value_to_string(value) if value: # just add not empty attributes xml.set(attribute, value) for element in self.elements: xml.append(element.get_xml()) return xml def value_to_string(self, value): """ Converts *value* into a <string> includes a value check, depending on :attr:`self.debug` and :attr:`self.profile`. """ if isinstance(value, (int, float)): if self.debug: self.validator.check_svg_type(value, 'number') if isinstance(value, float) and self.profile == 'tiny': value = round(value, 4) return str(value) def set_desc(self, title=None, desc=None): """ Insert a **title** and/or a **desc** element as first subelement. """ if desc is not None: self.elements.insert(0, Desc(desc)) if title is not None: self.elements.insert(0, Title(title)) def set_metadata(self, xmldata): """ :param xmldata: an xml.etree.ElementTree - Element() object. """ metadata = Metadata(xmldata) if len(self.elements) == 0: self.elements.append(metadata) else: pos = 0 while self.elements[pos].elementname in ('title', 'desc'): pos += 1 if pos == len(self.elements): self.elements.append(metadata) return if self.elements[pos].elementname == 'metadata': self.elements[pos].xml.append(xmldata) else: self.elements.insert(pos, metadata) class Title(object): elementname = 'title' def __init__(self, text): self.xml = etree.Element(self.elementname) self.xml.text = str(text) def get_xml(self): return self.xml class Desc(Title): elementname = 'desc' class Metadata(Title): elementname = 'metadata' def __init__(self, xmldata): """ :param xmldata: an xml.etree.ElementTree - Element() object. """ self.xml = etree.Element('metadata') self.xml.append(xmldata)