markupwriters.py

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#  Copyright 2008-2015 Nokia Networks
#  Copyright 2016-     Robot Framework Foundation
#
#  Licensed under the Apache License, Version 2.0 (the "License");
#  you may not use this file except in compliance with the License.
#  You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
#  Unless required by applicable law or agreed to in writing, software
#  distributed under the License is distributed on an "AS IS" BASIS,
#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#  See the License for the specific language governing permissions and
#  limitations under the License.
 
from .markuputils import attribute_escape, html_escape, xml_escape
from .robottypes import is_string
from .robotio import file_writer
 
 
class _MarkupWriter():
 
    
    def __init__(self, output, write_empty=True):
        if is_string(output):
            output = file_writer(output)
        self.outputoutput = output
        self._write_empty_write_empty = write_empty
        self._preamble_preamble()
 
    def _preamble(self):
        pass
 
    def start(self, name, attrs=None, newline=True):
        attrs = self._format_attrs(attrs)
        self._start(name, attrs, newline)
 
    def _start(self, name, attrs, newline):
        self._write_write('<%s %s>' % (name, attrs) if attrs else '<%s>' % name,
                    newline)
 
    def _format_attrs(self, attrs):
        if not attrs:
            return ''
        attrs = [(k, attribute_escape(attrs[k] or ''))
                 for k in self._order_attrs_order_attrs(attrs)]
        write_empty = self._write_empty_write_empty
        return ' '.join('%s="%s"' % a for a in attrs if write_empty or a[1])
 
    def _order_attrs(self, attrs):
        return attrs
 
    def content(self, content=None, escape=True, newline=False):
        if content:
            self._write_write(self._escape_escape(content) if escape else content, newline)
 
    def _escape(self, content):
        raise NotImplementedError
 
    def end(self, name, newline=True):
        self._write_write('</%s>' % name, newline)
 
    def element(self, name, content=None, attrs=None, escape=True,
                newline=True, replace_newlines=False):
        attrs = self._format_attrs_format_attrs(attrs)
        if self._write_empty_write_empty or content or attrs:
            self._start_start(name, attrs, newline=False)
            self.contentcontent(content, escape, replace_newlines)
            self.endend(name, newline)
 
    
    def close(self):
        self.outputoutput.close()
 
    def _write(self, text, newline=False):
        self.outputoutput.write(text)
        if newline:
            self.outputoutput.write('\n')
 
 
class HtmlWriter(_MarkupWriter):
 
    def _order_attrs(self, attrs):
        return sorted(attrs)  # eases testing
 
    def _escape(self, content):
        return html_escape(content)
 
 
class XmlWriter(_MarkupWriter):
 
    def _preamble(self):
        self._write_write('<?xml version="1.0" encoding="UTF-8"?>', newline=True)
 
    def _escape(self, text):
        return xml_escape(text)
 
 
 
class NullMarkupWriter():
 
    __init__ = start = content = element = end = close = \
        lambda *args, **kwargs: None