comprehemd 1.0.0a1

Markdown parser

🤔 CompreheMD

CompreheMD is a Python package for parsing Markdown documents.

Installation

CompreheMD requires Python 3.8 or later.

Install CompreheMD via pip:

pip install comprehemd

MarkdownParser class

Parsing a stream

The Markdown document parsed in this example is example.md.

To read an entire text stream, call .read(reader: IO[str]). The method yields blocks until the stream ends.

from comprehemd import MarkdownParser

with open("docs/example.md", "r") as fp:
    for block in MarkdownParser().read(fp):
        print(block)

HeadingBlock (1): An Example Document
EmptyBlock
HeadingBlock (2): Introduction
EmptyBlock
Block: This is just a short example document.
EmptyBlock
HeadingBlock (2): Block examples
EmptyBlock
Block: Here's some backtick-fenced code:
EmptyBlock
CodeBlock (python): print("Hello, world!")
EmptyBlock
Block: Here's some tilde-fenced code:
EmptyBlock
CodeBlock (python): print("Hello, galaxy!")
EmptyBlock
Block: Here's some indented code:
EmptyBlock
CodeBlock (<None>): print("Hello, multiverse!")
EmptyBlock
Block: That's your lot!

Parsing chunks

The parser can be fed ad-hoc chunks of Markdown. The .feed(chunk: str) method yields all the blocks that the chunk completed.

After feeding the final chunk, you must call .close() to flush and yield any buffered blocks.

from comprehemd import CodeBlock, HeadingBlock, MarkdownParser

def tease(chunk: str) -> None:
    escaped = chunk.replace("\n", "\\n")
    for block in parser.feed(chunk):
        print(f'After "{escaped}", the parser yielded:')
        print(block)
        print()
    else:
        print(f'After "{escaped}", the parser did not yield.')
        print()


parser = MarkdownParser()

tease("# Feeding exam")
tease("ple\n\nThis de")
tease("monstrates chu")
tease("nked feeding.")

for block in parser.close():
    print("After closing, the parser yielded:")
    print(block)
    print()

After "# Feeding exam", the parser did not yield.

After "ple\n\nThis de", the parser yielded:
HeadingBlock (1): Feeding example

After "ple\n\nThis de", the parser yielded:
EmptyBlock

After "ple\n\nThis de", the parser did not yield.

After "monstrates chu", the parser did not yield.

After "nked feeding.", the parser did not yield.

After closing, the parser yielded:
Block: This demonstrates chunked feeding.

Outline class

Generating an outline from a stream

The Markdown document parsed in this example is example.md.

The Outline class keeps track of headings to generate an outline of a Markdown document.

The simplest way to generate an outline is to pass a text stream into the read_outline() function:

from comprehemd import read_outline, OutlineItem

with open("docs/example.md", "r") as fp:
    outline = read_outline(fp)

def log(indent: int, item: OutlineItem) -> None:
    indent_str = "  " * indent
    print(f"{indent_str}{item.block}")
    for child in item.children:
        log(indent+1, child)

for item in outline.root:
    log(0, item)

HeadingBlock (1): An Example Document
  HeadingBlock (2): Introduction
  HeadingBlock (2): Block examples

Generating an outline via a MarkdownParser

The Markdown document parsed in this example is example.md.

If you're already parsing a document and would prefer to generate the outline as you go rather than read the document again then you can add headings manually:

from comprehemd import (
    HeadingBlock,
    MarkdownParser,
    Outline,
    OutlineItem,
)

outline = Outline()

with open("docs/example.md", "r") as fp:
    for block in MarkdownParser().read(fp):
        if isinstance(block, HeadingBlock):
            outline.add(block)

def log(indent: int, item: OutlineItem) -> None:
    indent_str = "  " * indent
    print(f"{indent_str}{item.block}")
    for child in item.children:
        log(indent+1, child)

for item in outline.root:
    log(0, item)

HeadingBlock (1): An Example Document
  HeadingBlock (2): Introduction
  HeadingBlock (2): Block examples

Rendering an outline

An outline can be rendered to Markdown by either treating the instance as a string or by calling .render(writer: IO[str]).

from comprehemd import read_outline, OutlineItem

with open("docs/example.md", "r") as fp:
    outline = read_outline(fp)

print(outline)

- [An Example Document](#an-example-document)
  - [Introduction](#introduction)
  - [Block examples](#block-examples)

Blocks classes

Block

The Block class is the base of all blocks.

• source returns the original Markdown source for the block.
• text returns the meaningful text representation of the block.

CodeBlock

The CodeBlock class represents a code block.

• language returns the language hint if one was specified.
• The block can be rendered back to Markdown by calling render(writer: IO[str], fence: Fence).

EmptyBlock

EmptyBlock represents an empty line.

HeadingBlock

The HeadingBlock class represents a heading.

• anchor returns the heading's anchor.
• level returns the heading's level (i.e. 1 for the top-most heading, down to 6 for the lowest).

Project

Contributing

To contribute a bug report, enhancement or feature request, please raise an issue at github.com/cariad/comprehemd/issues.

If you want to contribute a code change, please raise an issue first so we can chat about the direction you want to take.

Licence

CompreheMD is released at github.com/cariad/comprehemd under the MIT Licence.

See LICENSE for more information.

Author

Hello! 👋 I'm Cariad Eccleston and I'm a freelance DevOps and backend engineer. My contact details are available on my personal wiki at cariad.earth.

Please consider supporting my open source projects by sponsoring me on GitHub.

Acknowledgements

• Epic ❤️ to John Gruber for developing the original Markdown specification.
• This documentation was pressed by Edition.