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"""Read and write notebook files as XML."""
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from base64 import encodestring, decodestring
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from xml.etree import ElementTree as ET
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from .rwbase import NotebookReader, NotebookWriter
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from .nbbase import (
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new_code_cell, new_text_cell, new_worksheet, new_notebook, new_output
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)
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def indent(elem, level=0):
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i = "\n" + level*" "
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if len(elem):
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if not elem.text or not elem.text.strip():
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elem.text = i + " "
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if not elem.tail or not elem.tail.strip():
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elem.tail = i
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for elem in elem:
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indent(elem, level+1)
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if not elem.tail or not elem.tail.strip():
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elem.tail = i
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else:
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if level and (not elem.tail or not elem.tail.strip()):
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elem.tail = i
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def _get_text(e, tag):
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sub_e = e.find(tag)
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if sub_e is None:
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return None
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else:
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return sub_e.text
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def _set_text(nbnode, attr, parent, tag):
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if attr in nbnode:
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e = ET.SubElement(parent, tag)
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e.text = nbnode[attr]
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def _get_int(e, tag):
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sub_e = e.find(tag)
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if sub_e is None:
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return None
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else:
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return int(sub_e.text)
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def _set_int(nbnode, attr, parent, tag):
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if attr in nbnode:
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e = ET.SubElement(parent, tag)
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e.text = unicode(nbnode[attr])
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def _get_bool(e, tag):
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sub_e = e.find(tag)
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if sub_e is None:
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return None
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else:
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return bool(int(sub_e.text))
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def _set_bool(nbnode, attr, parent, tag):
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if attr in nbnode:
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e = ET.SubElement(parent, tag)
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if nbnode[attr]:
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e.text = u'1'
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else:
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e.text = u'0'
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def _get_binary(e, tag):
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sub_e = e.find(tag)
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if sub_e is None:
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return None
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else:
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return decodestring(sub_e.text)
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def _set_binary(nbnode, attr, parent, tag):
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if attr in nbnode:
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e = ET.SubElement(parent, tag)
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e.text = encodestring(nbnode[attr])
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class XMLReader(NotebookReader):
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def reads(self, s, **kwargs):
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root = ET.fromstring(s)
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return self.to_notebook(root, **kwargs)
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def to_notebook(self, root, **kwargs):
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nbname = _get_text(root,u'name')
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nbid = _get_text(root,u'id')
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nbauthor = _get_text(root,u'author')
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nbemail = _get_text(root,u'email')
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nblicense = _get_text(root,u'license')
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nbcreated = _get_text(root,u'created')
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nbsaved = _get_text(root,u'saved')
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worksheets = []
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for ws_e in root.find(u'worksheets').getiterator(u'worksheet'):
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wsname = _get_text(ws_e,u'name')
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cells = []
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for cell_e in ws_e.find(u'cells').getiterator():
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if cell_e.tag == u'codecell':
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input = _get_text(cell_e,u'input')
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prompt_number = _get_int(cell_e,u'prompt_number')
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collapsed = _get_bool(cell_e,u'collapsed')
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language = _get_text(cell_e,u'language')
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outputs = []
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for output_e in cell_e.find(u'outputs').getiterator(u'output'):
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output_type = _get_text(output_e,u'output_type')
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output_text = _get_text(output_e,u'text')
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output_png = _get_binary(output_e,u'png')
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output_jpeg = _get_binary(output_e,u'jpeg')
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output_svg = _get_text(output_e,u'svg')
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output_html = _get_text(output_e,u'html')
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output_latex = _get_text(output_e,u'latex')
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output_json = _get_text(output_e,u'json')
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output_javascript = _get_text(output_e,u'javascript')
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out_prompt_number = _get_int(output_e,u'prompt_number')
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etype = _get_text(output_e,u'etype')
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evalue = _get_text(output_e,u'evalue')
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traceback = []
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traceback_e = output_e.find(u'traceback')
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if traceback_e is not None:
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for frame_e in traceback_e.getiterator(u'frame'):
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traceback.append(frame_e.text)
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if len(traceback) == 0:
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traceback = None
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output = new_output(output_type=output_type,output_png=output_png,
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output_text=output_text, output_svg=output_svg,
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output_html=output_html, output_latex=output_latex,
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output_json=output_json, output_javascript=output_javascript,
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output_jpeg=output_jpeg, prompt_number=out_prompt_number,
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etype=etype, evalue=evalue, traceback=traceback
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)
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outputs.append(output)
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cc = new_code_cell(input=input,prompt_number=prompt_number,
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language=language,outputs=outputs,collapsed=collapsed)
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cells.append(cc)
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if cell_e.tag == u'htmlcell':
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source = _get_text(cell_e,u'source')
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rendered = _get_text(cell_e,u'rendered')
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cells.append(new_text_cell(u'html', source=source, rendered=rendered))
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if cell_e.tag == u'markdowncell':
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source = _get_text(cell_e,u'source')
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rendered = _get_text(cell_e,u'rendered')
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cells.append(new_text_cell(u'markdown', source=source, rendered=rendered))
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ws = new_worksheet(name=wsname,cells=cells)
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worksheets.append(ws)
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nb = new_notebook(name=nbname,id=nbid,worksheets=worksheets,author=nbauthor,
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email=nbemail,license=nblicense,saved=nbsaved,created=nbcreated)
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return nb
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class XMLWriter(NotebookWriter):
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def writes(self, nb, **kwargs):
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nb_e = ET.Element(u'notebook')
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_set_text(nb,u'name',nb_e,u'name')
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_set_text(nb,u'id',nb_e,u'id')
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_set_text(nb,u'author',nb_e,u'author')
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_set_text(nb,u'email',nb_e,u'email')
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_set_text(nb,u'license',nb_e,u'license')
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_set_text(nb,u'created',nb_e,u'created')
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_set_text(nb,u'saved',nb_e,u'saved')
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_set_int(nb,u'nbformat',nb_e,u'nbformat')
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wss_e = ET.SubElement(nb_e,u'worksheets')
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for ws in nb.worksheets:
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ws_e = ET.SubElement(wss_e, u'worksheet')
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_set_text(ws,u'name',ws_e,u'name')
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cells_e = ET.SubElement(ws_e,u'cells')
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for cell in ws.cells:
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cell_type = cell.cell_type
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if cell_type == u'code':
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cell_e = ET.SubElement(cells_e, u'codecell')
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_set_text(cell,u'input',cell_e,u'input')
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_set_text(cell,u'language',cell_e,u'language')
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_set_int(cell,u'prompt_number',cell_e,u'prompt_number')
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_set_bool(cell,u'collapsed',cell_e,u'collapsed')
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outputs_e = ET.SubElement(cell_e, u'outputs')
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for output in cell.outputs:
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output_e = ET.SubElement(outputs_e, u'output')
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_set_text(output,u'output_type',output_e,u'output_type')
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_set_text(output,u'text',output_e,u'text')
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_set_binary(output,u'png',output_e,u'png')
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_set_binary(output,u'jpeg',output_e,u'jpeg')
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_set_text(output,u'html',output_e,u'html')
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_set_text(output,u'svg',output_e,u'svg')
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_set_text(output,u'latex',output_e,u'latex')
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_set_text(output,u'json',output_e,u'json')
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_set_text(output,u'javascript',output_e,u'javascript')
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_set_int(output,u'prompt_number',output_e,u'prompt_number')
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_set_text(output,u'etype',output_e,u'etype')
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_set_text(output,u'evalue',output_e,u'evalue')
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if u'traceback' in output:
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tb_e = ET.SubElement(output_e, u'traceback')
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for frame in output.traceback:
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frame_e = ET.SubElement(tb_e, u'frame')
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frame_e.text = frame
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elif cell_type == u'html':
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cell_e = ET.SubElement(cells_e, u'htmlcell')
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_set_text(cell,u'source',cell_e,u'source')
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_set_text(cell,u'rendered',cell_e,u'rendered')
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elif cell_type == u'markdown':
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cell_e = ET.SubElement(cells_e, u'markdowncell')
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_set_text(cell,u'source',cell_e,u'source')
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_set_text(cell,u'rendered',cell_e,u'rendered')
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indent(nb_e)
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txt = ET.tostring(nb_e, encoding="utf-8")
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txt = '<?xml version="1.0" encoding="utf-8"?>\n' + txt
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return txt
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_reader = XMLReader()
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_writer = XMLWriter()
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reads = _reader.reads
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read = _reader.read
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to_notebook = _reader.to_notebook
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write = _writer.write
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writes = _writer.writes
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