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160 lines
5.5 KiB
Python
160 lines
5.5 KiB
Python
"""Read and write notebooks as regular .py files.
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Authors:
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* Brian Granger
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"""
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# -----------------------------------------------------------------------------
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# Copyright (C) 2008-2011 The IPython Development Team
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#
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# Distributed under the terms of the BSD License. The full license is in
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# the file LICENSE, distributed as part of this software.
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# -----------------------------------------------------------------------------
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# -----------------------------------------------------------------------------
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# Imports
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# -----------------------------------------------------------------------------
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from __future__ import annotations
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import re
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from .nbbase import new_code_cell, new_notebook, new_text_cell, new_worksheet
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from .rwbase import NotebookReader, NotebookWriter
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# -----------------------------------------------------------------------------
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# Code
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# -----------------------------------------------------------------------------
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_encoding_declaration_re = re.compile(r"^#.*coding[:=]\s*([-\w.]+)")
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class PyReaderError(Exception):
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"""An error raised by the PyReader."""
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class PyReader(NotebookReader):
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"""A Python notebook reader."""
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def reads(self, s, **kwargs):
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"""Convert a string to a notebook."""
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return self.to_notebook(s, **kwargs)
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def to_notebook(self, s, **kwargs):
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"""Convert a string to a notebook."""
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lines = s.splitlines()
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cells = []
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cell_lines: list[str] = []
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state = "codecell"
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for line in lines:
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if line.startswith("# <nbformat>") or _encoding_declaration_re.match(line):
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pass
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elif line.startswith("# <codecell>"):
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cell = self.new_cell(state, cell_lines)
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if cell is not None:
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cells.append(cell)
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state = "codecell"
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cell_lines = []
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elif line.startswith("# <htmlcell>"):
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cell = self.new_cell(state, cell_lines)
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if cell is not None:
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cells.append(cell)
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state = "htmlcell"
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cell_lines = []
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elif line.startswith("# <markdowncell>"):
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cell = self.new_cell(state, cell_lines)
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if cell is not None:
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cells.append(cell)
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state = "markdowncell"
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cell_lines = []
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else:
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cell_lines.append(line)
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if cell_lines and state == "codecell":
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cell = self.new_cell(state, cell_lines)
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if cell is not None:
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cells.append(cell)
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ws = new_worksheet(cells=cells)
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return new_notebook(worksheets=[ws])
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def new_cell(self, state, lines):
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"""Create a new cell."""
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if state == "codecell":
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input_ = "\n".join(lines)
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input_ = input_.strip("\n")
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if input_:
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return new_code_cell(input=input_)
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elif state == "htmlcell":
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text = self._remove_comments(lines)
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if text:
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return new_text_cell("html", source=text)
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elif state == "markdowncell":
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text = self._remove_comments(lines)
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if text:
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return new_text_cell("markdown", source=text)
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def _remove_comments(self, lines):
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new_lines = []
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for line in lines:
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if line.startswith("#"):
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new_lines.append(line[2:])
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else:
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new_lines.append(line)
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text = "\n".join(new_lines)
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text = text.strip("\n")
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return text # noqa: RET504
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def split_lines_into_blocks(self, lines):
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"""Split lines into code blocks."""
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if len(lines) == 1:
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yield lines[0]
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raise StopIteration()
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import ast
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source = "\n".join(lines)
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code = ast.parse(source)
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starts = [x.lineno - 1 for x in code.body]
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for i in range(len(starts) - 1):
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yield "\n".join(lines[starts[i] : starts[i + 1]]).strip("\n")
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yield "\n".join(lines[starts[-1] :]).strip("\n")
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class PyWriter(NotebookWriter):
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"""A Python notebook writer."""
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def writes(self, nb, **kwargs):
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"""Convert a notebook object to a string."""
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lines = ["# -*- coding: utf-8 -*-"]
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lines.extend(["# <nbformat>2</nbformat>", ""])
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for ws in nb.worksheets:
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for cell in ws.cells:
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if cell.cell_type == "code":
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input_ = cell.get("input")
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if input_ is not None:
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lines.extend(["# <codecell>", ""])
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lines.extend(input_.splitlines())
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lines.append("")
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elif cell.cell_type == "html":
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input_ = cell.get("source")
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if input_ is not None:
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lines.extend(["# <htmlcell>", ""])
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lines.extend(["# " + line for line in input_.splitlines()])
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lines.append("")
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elif cell.cell_type == "markdown":
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input_ = cell.get("source")
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if input_ is not None:
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lines.extend(["# <markdowncell>", ""])
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lines.extend(["# " + line for line in input_.splitlines()])
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lines.append("")
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lines.append("")
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return str("\n".join(lines))
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_reader = PyReader()
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_writer = PyWriter()
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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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